Merge pull request 'develop' (#35) from develop into main

Reviewed-on: goffee/core#35

config.go

@@ -1,10 +1,13 @@
 // Copyright 2021 Harran Ali <harran.m@gmail.com>. All rights reserved.
 // Copyright (c) 2024 Zeni Kim <zenik@smarteching.com>
+// Copyright (c) 2026 Jose Cely <me@jacs.guru>
 // Use of this source code is governed by MIT-style
 // license that can be found in the LICENSE file.
 
 package core
 
+import "time"
+
 type EnvFileConfig struct {
 	UseDotEnvFile bool
 }
@@ -24,6 +27,14 @@ type GormConfig struct {
 
 type QueueConfig struct {
 	EnableQueue bool
+	Concurrency int
+	Queues      map[string]int
+}
+
+type SchedulerConfig struct {
+	EnableScheduler    bool
+	SchedulerInterval  time.Duration
+	SchedulerRateLimit int
 }
 
 type CacheConfig struct {

context.go

@@ -34,6 +34,7 @@ type Context struct {
 	GetMailer        func() *Mailer
 	GetEventsManager func() *EventsManager
 	GetLogger        func() *logger.Logger
+	GetSession       func() *SessionUser
 }
 
 // TODO enhance
@@ -54,7 +55,11 @@ func (c *Context) Next() {
 }
 
 func (c *Context) prepare(ctx *Context) {
-	ctx.Request.httpRequest.ParseMultipartForm(int64(app.Config.Request.MaxUploadFileSize))
+	// Only parse multipart form if it hasn't been parsed already
+	// This prevents race conditions when multiple goroutines might access the same request
+	if ctx.Request.httpRequest.MultipartForm == nil {
+		ctx.Request.httpRequest.ParseMultipartForm(int64(app.Config.Request.MaxUploadFileSize))
+	}
 }
 
 func (c *Context) GetPathParam(key string) interface{} {

cookies.go

@@ -19,6 +19,7 @@ import (
 	"os"
 	"strconv"
 	"strings"
+	"time"
 )
 
 // ErrValueTooLong indicates that the cookie value exceeds the allowed length limit.
@@ -84,9 +85,8 @@ func GetCookie(r *http.Request) (UserCookie, error) {
 }
 
 // SetCookie sets an encrypted cookie with a user's email and token, using gob encoding for data serialization.
+// The Secure flag is controlled by the COOKIE_SECURE environment variable (defaults to true, set to false for local HTTP development).
 func SetCookie(w http.ResponseWriter, email string, token string) error {
-	// Initialize a User struct containing the data that we want to store in the
-	// cookie.
 	var err error
 
 	// check if template engine is enable
@@ -124,15 +124,36 @@ func SetCookie(w http.ResponseWriter, email string, token string) error {
 		return err
 	}
 
+	// Derive cookie MaxAge from JWT_LIFESPAN_MINUTES (default: 1440 min = 1 day)
+	maxAge := 1440 * 60 // default 1 day in seconds
+	lifetimeStr := os.Getenv("JWT_LIFESPAN_MINUTES")
+	if lifetimeStr != "" {
+		lifetime, parseErr := strconv.Atoi(lifetimeStr)
+		if parseErr == nil {
+			maxAge = lifetime * 60 // convert minutes to seconds
+		}
+	}
+
+	// Determine if the cookie should have the Secure flag.
+	// Set COOKIE_SECURE=false (or "0", "f") in your .env for local development over HTTP.
+	// Defaults to true for production safety.
+	cookieSecureStr := os.Getenv("COOKIE_SECURE")
+	if cookieSecureStr == "" {
+		cookieSecureStr = "true"
+	}
+	cookieSecure, _ := strconv.ParseBool(cookieSecureStr)
+
 	// Call buf.String() to get the gob-encoded value as a string and set it as
 	// the cookie value.
 	cookie := http.Cookie{
 		Name:     "goffee",
 		Value:    buf.String(),
 		Path:     "/",
-		MaxAge:   3600,
+		MaxAge:   maxAge,
+		Expires:  time.Now().Add(time.Duration(maxAge) * time.Second),
 		HttpOnly: true,
 		SameSite: http.SameSiteLaxMode,
+		Secure:   cookieSecure,
 	}
 
 	// Write an encrypted cookie containing the gob-encoded data as normal.

core.go

@@ -6,6 +6,7 @@
 package core
 
 import (
+	"context"
 	"embed"
 	"fmt"
 	"log"
@@ -25,6 +26,7 @@ import (
 	"gorm.io/driver/postgres"
 	"gorm.io/driver/sqlite"
 	"gorm.io/gorm"
+	gormlogger "gorm.io/gorm/logger"
 )
 
 var loggr *logger.Logger
@@ -51,12 +53,18 @@ type configContainer struct {
 
 // App is a struct representing the main application container and its core components.
 type App struct {
-	t      int // for tracking hooks
+	t      int // for tracking hooks (deprecated - maintained for backward compatibility)
 	chain  *chain
 	hooks  *Hooks
 	Config *configContainer
 }
 
+// requestContext holds request-specific chain execution state
+type requestContext struct {
+	chainIndex int
+	chainNodes []interface{}
+}
+
 // app is a global instance of the App structure used to manage application configuration and lifecycle.
 var app *App
 
@@ -231,10 +239,25 @@ func (app *App) RegisterRoutes(routes []Route, router *httprouter.Router) *httpr
 // makeHTTPRouterHandlerFunc creates an httprouter.Handle that handles HTTP requests with the specified controller and hooks.
 func (app *App) makeHTTPRouterHandlerFunc(h Controller, ms []Hook) httprouter.Handle {
 	return func(w http.ResponseWriter, r *http.Request, ps httprouter.Params) {
-
+		// Create request-specific chain state
+		reqCtx := &requestContext{
+			chainIndex: 0,
+		}
+		
+		// Prepare the chain nodes for this request
+		mw := app.hooks.GetHooks()
+		for _, v := range mw {
+			reqCtx.chainNodes = append(reqCtx.chainNodes, v)
+		}
+		rhs := app.combHandlers(h, ms)
+		for _, v := range rhs {
+			reqCtx.chainNodes = append(reqCtx.chainNodes, v)
+		}
+		
+		// Store chain state in request context
 		ctx := &Context{
 			Request: &Request{
-				httpRequest:    r,
+				httpRequest:    r.WithContext(context.WithValue(r.Context(), "goffeeChain", reqCtx)),
 				httpPathParams: ps,
 			},
 			Response: &Response{
@@ -254,18 +277,24 @@ func (app *App) makeHTTPRouterHandlerFunc(h Controller, ms []Hook) httprouter.Ha
 			GetMailer:        resolveMailer(),
 			GetEventsManager: resolveEventsManager(),
 			GetLogger:        resolveLogger(),
+			GetSession:       getSession(),
 		}
 
 		ctx.prepare(ctx)
-		rhs := app.combHandlers(h, ms)
+		
-		app.prepareChain(rhs)
+		// Execute the first handler in the chain
-		app.t = 0
+		if len(reqCtx.chainNodes) > 0 {
-		app.chain.execute(ctx)
+			n := reqCtx.chainNodes[0]
+			if f, ok := n.(Hook); ok {
+				f(ctx)
+			} else if ff, ok := n.(Controller); ok {
+				ff(ctx)
+			}
+		}
 
 		for _, header := range ctx.Response.headers {
 			w.Header().Add(header.key, header.val)
 		}
-		logger.CloseLogsFile()
 		var ct string
 		if ctx.Response.overrideContentType != "" {
 			ct = ctx.Response.overrideContentType
@@ -280,7 +309,11 @@ func (app *App) makeHTTPRouterHandlerFunc(h Controller, ms []Hook) httprouter.Ha
 			w.WriteHeader(ctx.Response.statusCode)
 		}
 		if ctx.Response.redirectTo != "" {
-			http.Redirect(w, r, ctx.Response.redirectTo, http.StatusTemporaryRedirect)
+			statusCode := ctx.Response.redirectStatusCode
+			if statusCode == 0 {
+				statusCode = http.StatusTemporaryRedirect // default to 307
+			}
+			http.Redirect(w, r, ctx.Response.redirectTo, statusCode)
 		} else {
 			w.Write(ctx.Response.body)
 		}
@@ -306,7 +339,7 @@ func (n notFoundHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	w.WriteHeader(http.StatusNotFound)
 	res := "{\"message\": \"Not Found\"}"
 	loggr.Error("Not Found")
-	loggr.Error(debug.Stack())
+	//loggr.Error(debug.Stack())
 	w.Header().Add(CONTENT_TYPE, CONTENT_TYPE_JSON)
 	w.Write([]byte(res))
 }
@@ -316,7 +349,7 @@ func (n methodNotAllowed) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	w.WriteHeader(http.StatusMethodNotAllowed)
 	res := "{\"message\": \"Method not allowed\"}"
 	loggr.Error("Method not allowed")
-	loggr.Error(debug.Stack())
+	//loggr.Error(debug.Stack())
 	w.Header().Add(CONTENT_TYPE, CONTENT_TYPE_JSON)
 	w.Write([]byte(res))
 }
@@ -344,7 +377,7 @@ var panicHandler = func(w http.ResponseWriter, r *http.Request, e interface{}) {
 	shrtMsg := fmt.Sprintf("%v", e)
 	loggr.Error(shrtMsg)
 	fmt.Println(shrtMsg)
-	loggr.Error(string(debug.Stack()))
+	//loggr.Error(string(debug.Stack()))
 	var res string
 	if env.GetVarOtherwiseDefault("APP_ENV", "local") == PRODUCTION {
 		res = "{\"message\": \"internal error\"}"
@@ -363,18 +396,32 @@ func UseHook(mw Hook) {
 
 // Next advances to the next middleware or controller in the chain and invokes it with the given context if available.
 func (app *App) Next(c *Context) {
-	app.t = app.t + 1
+	// Get request-specific chain state from context
-	n := app.chain.getByIndex(app.t)
+	if reqCtx, ok := c.Request.httpRequest.Context().Value("goffeeChain").(*requestContext); ok {
-	if n != nil {
+		reqCtx.chainIndex++
-		f, ok := n.(Hook)
+		if reqCtx.chainIndex < len(reqCtx.chainNodes) {
-		if ok {
+			n := reqCtx.chainNodes[reqCtx.chainIndex]
-			f(c)
+			if f, ok := n.(Hook); ok {
-		} else {
+				f(c)
-			ff, ok := n.(Controller)
+			} else if ff, ok := n.(Controller); ok {
-			if ok {
 				ff(c)
 			}
 		}
+	} else {
+		// Fallback to old behavior (not thread-safe)
+		app.t = app.t + 1
+		n := app.chain.getByIndex(app.t)
+		if n != nil {
+			f, ok := n.(Hook)
+			if ok {
+				f(c)
+			} else {
+				ff, ok := n.(Controller)
+				if ok {
+					ff(c)
+				}
+			}
+		}
 	}
 }
 
@@ -410,6 +457,17 @@ func (app *App) prepareChain(hs []interface{}) {
 	}
 }
 
+// prepareRequestChain prepares a request-specific chain to avoid race conditions
+func (app *App) prepareRequestChain(requestChain *chain, hs []interface{}) {
+	mw := app.hooks.GetHooks()
+	for _, v := range mw {
+		requestChain.nodes = append(requestChain.nodes, v)
+	}
+	for _, v := range hs {
+		requestChain.nodes = append(requestChain.nodes, v)
+	}
+}
+
 // execute executes the first node in the chain, invoking it as either a Hook or Controller if applicable.
 func (cn *chain) execute(ctx *Context) {
 	i := cn.getByIndex(0)
@@ -465,13 +523,18 @@ func NewGorm() *gorm.DB {
 		if err != nil {
 			panic(fmt.Sprintf("error locating sqlite file: %v", err.Error()))
 		}
-		db, err = gorm.Open(sqlite.Open(fullSqlitePath), &gorm.Config{})
+		db, err = gorm.Open(sqlite.Open(fullSqlitePath), &gorm.Config{
+			Logger: gormlogger.Default.LogMode(gormlogger.Silent),
+		})
 	default:
 		panic("database driver not selected")
 	}
 	if gormC.EnableGorm && err != nil {
 		panic(fmt.Sprintf("gorm has problem connecting to %v, (if it's not needed you can disable it in config/gorm.go): %v", os.Getenv("DB_DRIVER"), err))
 	}
+	if db != nil {
+		db.Logger = db.Logger.LogMode(gormlogger.Silent)
+	}
 	return db
 }
 
@@ -508,7 +571,9 @@ func postgresConnect() (*gorm.DB, error) {
 		os.Getenv("POSTGRES_SSL_MODE"),
 		os.Getenv("POSTGRES_TIMEZONE"),
 	)
-	return gorm.Open(postgres.Open(dsn), &gorm.Config{})
+	return gorm.Open(postgres.Open(dsn), &gorm.Config{
+		Logger: gormlogger.Default.LogMode(gormlogger.Silent),
+	})
 }
 
 // mysqlConnect establishes a connection to a MySQL database using credentials and configurations from environment variables.
@@ -529,7 +594,9 @@ func mysqlConnect() (*gorm.DB, error) {
 		DontSupportRenameIndex:    true,  // drop & create when rename index, rename index not supported before MySQL 5.7, MariaDB
 		DontSupportRenameColumn:   true,  // `change` when rename column, rename column not supported before MySQL 8, MariaDB
 		SkipInitializeWithVersion: false, // auto configure based on currently MySQL version
-	}), &gorm.Config{})
+	}), &gorm.Config{
+		Logger: gormlogger.Default.LogMode(gormlogger.Silent),
+	})
 }
 
 // getJWT returns a function that initializes and provides a *JWT instance configured with environment variables.
@@ -619,6 +686,14 @@ func resolveLogger() func() *logger.Logger {
 	return f
 }
 
+// getSession returns a function that creates and returns a new SessionUser instance when invoked.
+func getSession() func() *SessionUser {
+	f := func() *SessionUser {
+		return &SessionUser{}
+	}
+	return f
+}
+
 // MakeDirs creates the specified directories under the base path with the provided permissions (0766).
 func (app *App) MakeDirs(dirs ...string) {
 	o := syscall.Umask(0)

go.mod

@@ -4,57 +4,61 @@ replace git.smarteching.com/goffee/core/logger => ./logger
 
 replace git.smarteching.com/goffee/core/env => ./env
 
-go 1.24.1
+go 1.25.0
 
 require (
 	git.smarteching.com/zeni/go-chart/v2 v2.1.4
+	git.smarteching.com/zeni/go-charts/v2 v2.6.11
 	github.com/brianvoe/gofakeit/v6 v6.21.0
-	github.com/golang-jwt/jwt/v5 v5.0.0
+	github.com/golang-jwt/jwt/v5 v5.3.1
 	github.com/google/uuid v1.6.0
 	github.com/harranali/mailing v1.2.0
+	github.com/hibiken/asynq v0.26.0
 	github.com/joho/godotenv v1.5.1
 	github.com/julienschmidt/httprouter v1.3.0
-	github.com/redis/go-redis/v9 v9.7.0
+	github.com/redis/go-redis/v9 v9.21.0
-	golang.org/x/crypto v0.11.0
+	golang.org/x/crypto v0.53.0
-	gorm.io/driver/mysql v1.5.1
+	golang.org/x/text v0.38.0
-	gorm.io/driver/postgres v1.5.2
+	gorm.io/driver/mysql v1.6.0
-	gorm.io/driver/sqlite v1.5.2
+	gorm.io/driver/postgres v1.6.0
-	gorm.io/gorm v1.25.2
+	gorm.io/driver/sqlite v1.6.0
+	gorm.io/gorm v1.31.1
 )
 
 require (
-	git.smarteching.com/zeni/go-charts/v2 v2.6.11 // indirect
+	filippo.io/edwards25519 v1.2.0 // indirect
 	github.com/SparkPost/gosparkpost v0.2.0 // indirect
 	github.com/asaskevich/govalidator v0.0.0-20230301143203-a9d515a09cc2 // indirect
 	github.com/dustin/go-humanize v1.0.1 // indirect
-	github.com/go-chi/chi/v5 v5.0.8 // indirect
+	github.com/go-chi/chi/v5 v5.3.0 // indirect
-	github.com/go-sql-driver/mysql v1.7.0 // indirect
+	github.com/go-sql-driver/mysql v1.10.0 // indirect
 	github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0 // indirect
-	github.com/hibiken/asynq v0.25.1 // indirect
 	github.com/jackc/pgpassfile v1.0.0 // indirect
-	github.com/jackc/pgservicefile v0.0.0-20221227161230-091c0ba34f0a // indirect
+	github.com/jackc/pgservicefile v0.0.0-20240606120523-5a60cdf6a761 // indirect
-	github.com/jackc/pgx/v5 v5.3.1 // indirect
+	github.com/jackc/pgx/v5 v5.10.0 // indirect
-	github.com/json-iterator/go v1.1.10 // indirect
+	github.com/jackc/puddle/v2 v2.2.2 // indirect
-	github.com/mailgun/mailgun-go/v4 v4.10.0 // indirect
+	github.com/json-iterator/go v1.1.12 // indirect
-	github.com/mattn/go-sqlite3 v1.14.17 // indirect
+	github.com/mailgun/errors v0.6.0 // indirect
-	github.com/modern-go/concurrent v0.0.0-20180228061459-e0a39a4cb421 // indirect
+	github.com/mailgun/mailgun-go/v4 v4.23.0 // indirect
-	github.com/modern-go/reflect2 v0.0.0-20180701023420-4b7aa43c6742 // indirect
+	github.com/mattn/go-sqlite3 v1.14.47 // indirect
+	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
+	github.com/modern-go/reflect2 v1.0.2 // indirect
 	github.com/pkg/errors v0.9.1 // indirect
 	github.com/robfig/cron/v3 v3.0.1 // indirect
 	github.com/sendgrid/rest v2.6.9+incompatible // indirect
-	github.com/sendgrid/sendgrid-go v3.12.0+incompatible // indirect
+	github.com/sendgrid/sendgrid-go v3.16.1+incompatible // indirect
-	github.com/spf13/cast v1.7.0 // indirect
+	github.com/spf13/cast v1.10.0 // indirect
-	golang.org/x/image v0.21.0 // indirect
+	go.uber.org/atomic v1.11.0 // indirect
-	golang.org/x/net v0.10.0 // indirect
+	golang.org/x/image v0.43.0 // indirect
-	golang.org/x/sys v0.27.0 // indirect
+	golang.org/x/net v0.56.0 // indirect
-	golang.org/x/text v0.19.0 // indirect
+	golang.org/x/sync v0.21.0 // indirect
-	golang.org/x/time v0.8.0 // indirect
+	golang.org/x/sys v0.46.0 // indirect
-	google.golang.org/protobuf v1.35.2 // indirect
+	golang.org/x/time v0.15.0 // indirect
+	google.golang.org/protobuf v1.36.11 // indirect
 )
 
 require (
-	github.com/cespare/xxhash/v2 v2.2.0 // indirect
+	github.com/cespare/xxhash/v2 v2.3.0 // indirect
-	github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f // indirect
 	github.com/go-ozzo/ozzo-validation v3.6.0+incompatible
 	github.com/jinzhu/inflection v1.0.0 // indirect
 	github.com/jinzhu/now v1.1.5 // indirect

go.sum

@@ -1,3 +1,5 @@
+filippo.io/edwards25519 v1.2.0 h1:crnVqOiS4jqYleHd9vaKZ+HKtHfllngJIiOpNpoJsjo=
+filippo.io/edwards25519 v1.2.0/go.mod h1:xzAOLCNug/yB62zG1bQ8uziwrIqIuxhctzJT18Q77mc=
 git.smarteching.com/zeni/go-chart/v2 v2.1.4 h1:pF06+F6eqJLIG8uMiTVPR5TygPGMjM/FHMzTxmu5V/Q=
 git.smarteching.com/zeni/go-chart/v2 v2.1.4/go.mod h1:b3ueW9h3pGGXyhkormZAvilHaG4+mQti+bMNPdQBeOQ=
 git.smarteching.com/zeni/go-charts/v2 v2.6.11 h1:9udzlv3uxGXszpplfkL5IaTUrgkNj++KwhbaN1vVEqI=
@@ -8,54 +10,54 @@ github.com/asaskevich/govalidator v0.0.0-20230301143203-a9d515a09cc2 h1:DklsrG3d
 github.com/asaskevich/govalidator v0.0.0-20230301143203-a9d515a09cc2/go.mod h1:WaHUgvxTVq04UNunO+XhnAqY/wQc+bxr74GqbsZ/Jqw=
 github.com/brianvoe/gofakeit/v6 v6.21.0 h1:tNkm9yxEbpuPK8Bx39tT4sSc5i9SUGiciLdNix+VDQY=
 github.com/brianvoe/gofakeit/v6 v6.21.0/go.mod h1:Ow6qC71xtwm79anlwKRlWZW6zVq9D2XHE4QSSMP/rU8=
-github.com/bsm/ginkgo/v2 v2.7.0 h1:ItPMPH90RbmZJt5GtkcNvIRuGEdwlBItdNVoyzaNQao=
+github.com/bsm/ginkgo/v2 v2.12.0 h1:Ny8MWAHyOepLGlLKYmXG4IEkioBysk6GpaRTLC8zwWs=
-github.com/bsm/ginkgo/v2 v2.7.0/go.mod h1:AiKlXPm7ItEHNc/2+OkrNG4E0ITzojb9/xWzvQ9XZ9w=
+github.com/bsm/ginkgo/v2 v2.12.0/go.mod h1:SwYbGRRDovPVboqFv0tPTcG1sN61LM1Z4ARdbAV9g4c=
-github.com/bsm/gomega v1.26.0 h1:LhQm+AFcgV2M0WyKroMASzAzCAJVpAxQXv4SaI9a69Y=
+github.com/bsm/gomega v1.27.10 h1:yeMWxP2pV2fG3FgAODIY8EiRE3dy0aeFYt4l7wh6yKA=
-github.com/bsm/gomega v1.26.0/go.mod h1:JyEr/xRbxbtgWNi8tIEVPUYZ5Dzef52k01W3YH0H+O0=
+github.com/bsm/gomega v1.27.10/go.mod h1:JyEr/xRbxbtgWNi8tIEVPUYZ5Dzef52k01W3YH0H+O0=
 github.com/buger/jsonparser v1.0.0/go.mod h1:tgcrVJ81GPSF0mz+0nu1Xaz0fazGPrmmJfJtxjbHhUQ=
 github.com/cention-sany/utf7 v0.0.0-20170124080048-26cad61bd60a/go.mod h1:2GxOXOlEPAMFPfp014mK1SWq8G8BN8o7/dfYqJrVGn8=
-github.com/cespare/xxhash/v2 v2.2.0 h1:DC2CZ1Ep5Y4k3ZQ899DldepgrayRUGE6BBZ/cd9Cj44=
+github.com/cespare/xxhash/v2 v2.3.0 h1:UL815xU9SqsFlibzuggzjXhog7bL6oX9BbNZnL2UFvs=
-github.com/cespare/xxhash/v2 v2.2.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
+github.com/cespare/xxhash/v2 v2.3.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f h1:lO4WD4F/rVNCu3HqELle0jiPLLBs70cWOduZpkS1E78=
-github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f/go.mod h1:cuUVRXasLTGF7a8hSLbxyZXjz+1KgoB3wDUb6vlszIc=
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 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
 github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
-github.com/stretchr/testify v1.8.4 h1:CcVxjf3Q8PM0mHUKJCdn+eZZtm5yQwehR5yeSVQQcUk=
+github.com/stretchr/testify v1.11.1 h1:7s2iGBzp5EwR7/aIZr8ao5+dra3wiQyKjjFuvgVKu7U=
-github.com/stretchr/testify v1.8.4/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo=
+github.com/stretchr/testify v1.11.1/go.mod h1:wZwfW3scLgRK+23gO65QZefKpKQRnfz6sD981Nm4B6U=
-github.com/stretchr/testify v1.10.0 h1:Xv5erBjTwe/5IxqUQTdXv5kgmIvbHo3QQyRwhJsOfJA=
+github.com/zeebo/xxh3 v1.1.0 h1:s7DLGDK45Dyfg7++yxI0khrfwq9661w9EN78eP/UZVs=
+github.com/zeebo/xxh3 v1.1.0/go.mod h1:IisAie1LELR4xhVinxWS5+zf1lA4p0MW4T+w+W07F5s=
+go.uber.org/atomic v1.11.0 h1:ZvwS0R+56ePWxUNi+Atn9dWONBPp/AUETXlHW0DxSjE=
+go.uber.org/atomic v1.11.0/go.mod h1:LUxbIzbOniOlMKjJjyPfpl4v+PKK2cNJn91OQbhoJI0=
+go.uber.org/goleak v1.3.0 h1:2K3zAYmnTNqV73imy9J1T3WC+gmCePx2hEGkimedGto=
+go.uber.org/goleak v1.3.0/go.mod h1:CoHD4mav9JJNrW/WLlf7HGZPjdw8EucARQHekz1X6bE=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
-golang.org/x/crypto v0.11.0 h1:6Ewdq3tDic1mg5xRO4milcWCfMVQhI4NkqWWvqejpuA=
+golang.org/x/crypto v0.50.0 h1:zO47/JPrL6vsNkINmLoo/PH1gcxpls50DNogFvB5ZGI=
-golang.org/x/crypto v0.11.0/go.mod h1:xgJhtzW8F9jGdVFWZESrid1U1bjeNy4zgy5cRr/CIio=
+golang.org/x/crypto v0.50.0/go.mod h1:3muZ7vA7PBCE6xgPX7nkzzjiUq87kRItoJQM1Yo8S+Q=
-golang.org/x/image v0.21.0 h1:c5qV36ajHpdj4Qi0GnE0jUc/yuo33OLFaa0d+crTD5s=
+golang.org/x/crypto v0.53.0 h1:QZ4Muo8THX6CizN2vPPd5fBGHyogrdK9fG4wLPFUsto=
-golang.org/x/image v0.21.0/go.mod h1:vUbsLavqK/W303ZroQQVKQ+Af3Yl6Uz1Ppu5J/cLz78=
+golang.org/x/crypto v0.53.0/go.mod h1:DNLU434OwVakk9PzuwV8w62mAJpRJL3vsgcfp4Qnsio=
+golang.org/x/image v0.39.0 h1:skVYidAEVKgn8lZ602XO75asgXBgLj9G/FE3RbuPFww=
+golang.org/x/image v0.39.0/go.mod h1:sIbmppfU+xFLPIG0FoVUTvyBMmgng1/XAMhQ2ft0hpA=
+golang.org/x/image v0.43.0 h1:FLxcP4ec2350nTfOC8ysKtqYSIFbk/QGjw1ZHNP4tsY=
+golang.org/x/image v0.43.0/go.mod h1:rrpelvGFt+kLPAjPM4HeWPgrl0FtafueU//e5N0qk/Q=
 golang.org/x/net v0.0.0-20190724013045-ca1201d0de80/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
-golang.org/x/net v0.10.0 h1:X2//UzNDwYmtCLn7To6G58Wr6f5ahEAQgKNzv9Y951M=
+golang.org/x/net v0.53.0 h1:d+qAbo5L0orcWAr0a9JweQpjXF19LMXJE8Ey7hwOdUA=
-golang.org/x/net v0.10.0/go.mod h1:0qNGK6F8kojg2nk9dLZ2mShWaEBan6FAoqfSigmmuDg=
+golang.org/x/net v0.53.0/go.mod h1:JvMuJH7rrdiCfbeHoo3fCQU24Lf5JJwT9W3sJFulfgs=
+golang.org/x/net v0.56.0 h1:Rw8j/hFzGvJUZwNBXnAtf5sVDVt+65SK2C7IxCxZt5o=
+golang.org/x/net v0.56.0/go.mod h1:D3Ku6r+V6JROoZK144D2XfMHFcMq/0zSfLelVTCFKec=
+golang.org/x/sync v0.20.0 h1:e0PTpb7pjO8GAtTs2dQ6jYa5BWYlMuX047Dco/pItO4=
+golang.org/x/sync v0.20.0/go.mod h1:9xrNwdLfx4jkKbNva9FpL6vEN7evnE43NNNJQ2LF3+0=
+golang.org/x/sync v0.21.0 h1:HLII4xRRTtCRkxYp4HNFF0Js/Og6q2i++KXbg0gHCwM=
+golang.org/x/sync v0.21.0/go.mod h1:9xrNwdLfx4jkKbNva9FpL6vEN7evnE43NNNJQ2LF3+0=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
-golang.org/x/sys v0.27.0 h1:wBqf8DvsY9Y/2P8gAfPDEYNuS30J4lPHJxXSb/nJZ+s=
+golang.org/x/sys v0.43.0 h1:Rlag2XtaFTxp19wS8MXlJwTvoh8ArU6ezoyFsMyCTNI=
-golang.org/x/sys v0.27.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+golang.org/x/sys v0.43.0/go.mod h1:4GL1E5IUh+htKOUEOaiffhrAeqysfVGipDYzABqnCmw=
+golang.org/x/sys v0.46.0 h1:noSf2Fq6F8DBgS+LysIkx7rIExoNHJsxOAtPp4rthXw=
+golang.org/x/sys v0.46.0/go.mod h1:4GL1E5IUh+htKOUEOaiffhrAeqysfVGipDYzABqnCmw=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
-golang.org/x/text v0.19.0 h1:kTxAhCbGbxhK0IwgSKiMO5awPoDQ0RpfiVYBfK860YM=
+golang.org/x/text v0.36.0 h1:JfKh3XmcRPqZPKevfXVpI1wXPTqbkE5f7JA92a55Yxg=
-golang.org/x/text v0.19.0/go.mod h1:BuEKDfySbSR4drPmRPG/7iBdf8hvFMuRexcpahXilzY=
+golang.org/x/text v0.36.0/go.mod h1:NIdBknypM8iqVmPiuco0Dh6P5Jcdk8lJL0CUebqK164=
-golang.org/x/time v0.8.0 h1:9i3RxcPv3PZnitoVGMPDKZSq1xW1gK1Xy3ArNOGZfEg=
+golang.org/x/text v0.38.0 h1:sXmwo9DwP3OK9EZ7PqAdaooSGozfl/3a6/xJcbzPRhE=
-golang.org/x/time v0.8.0/go.mod h1:3BpzKBy/shNhVucY/MWOyx10tF3SFh9QdLuxbVysPQM=
+golang.org/x/text v0.38.0/go.mod h1:YXZt3QhHUKYT53r2lLKFIVi6Ao1jdzrTR/KQ09qyxF4=
+golang.org/x/time v0.15.0 h1:bbrp8t3bGUeFOx08pvsMYRTCVSMk89u4tKbNOZbp88U=
+golang.org/x/time v0.15.0/go.mod h1:Y4YMaQmXwGQZoFaVFk4YpCt4FLQMYKZe9oeV/f4MSno=
 golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
-google.golang.org/protobuf v1.35.2 h1:8Ar7bF+apOIoThw1EdZl0p1oWvMqTHmpA2fRTyZO8io=
+google.golang.org/protobuf v1.36.11 h1:fV6ZwhNocDyBLK0dj+fg8ektcVegBBuEolpbTQyBNVE=
-google.golang.org/protobuf v1.35.2/go.mod h1:9fA7Ob0pmnwhb644+1+CVWFRbNajQ6iRojtC/QF5bRE=
+google.golang.org/protobuf v1.36.11/go.mod h1:HTf+CrKn2C3g5S8VImy6tdcUvCska2kB7j23XfzDpco=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
-gorm.io/driver/mysql v1.5.1 h1:WUEH5VF9obL/lTtzjmML/5e6VfFR/788coz2uaVCAZw=
+gorm.io/driver/mysql v1.6.0 h1:eNbLmNTpPpTOVZi8MMxCi2aaIm0ZpInbORNXDwyLGvg=
-gorm.io/driver/mysql v1.5.1/go.mod h1:Jo3Xu7mMhCyj8dlrb3WoCaRd1FhsVh+yMXb1jUInf5o=
+gorm.io/driver/mysql v1.6.0/go.mod h1:D/oCC2GWK3M/dqoLxnOlaNKmXz8WNTfcS9y5ovaSqKo=
-gorm.io/driver/postgres v1.5.2 h1:ytTDxxEv+MplXOfFe3Lzm7SjG09fcdb3Z/c056DTBx0=
+gorm.io/driver/postgres v1.6.0 h1:2dxzU8xJ+ivvqTRph34QX+WrRaJlmfyPqXmoGVjMBa4=
-gorm.io/driver/postgres v1.5.2/go.mod h1:fmpX0m2I1PKuR7mKZiEluwrP3hbs+ps7JIGMUBpCgl8=
+gorm.io/driver/postgres v1.6.0/go.mod h1:vUw0mrGgrTK+uPHEhAdV4sfFELrByKVGnaVRkXDhtWo=
-gorm.io/driver/sqlite v1.5.2 h1:TpQ+/dqCY4uCigCFyrfnrJnrW9zjpelWVoEVNy5qJkc=
+gorm.io/driver/sqlite v1.6.0 h1:WHRRrIiulaPiPFmDcod6prc4l2VGVWHz80KspNsxSfQ=
-gorm.io/driver/sqlite v1.5.2/go.mod h1:qxAuCol+2r6PannQDpOP1FP6ag3mKi4esLnB/jHed+4=
+gorm.io/driver/sqlite v1.6.0/go.mod h1:AO9V1qIQddBESngQUKWL9yoH93HIeA1X6V633rBwyT8=
-gorm.io/gorm v1.25.1/go.mod h1:L4uxeKpfBml98NYqVqwAdmV1a2nBtAec/cf3fpucW/k=
+gorm.io/gorm v1.31.1 h1:7CA8FTFz/gRfgqgpeKIBcervUn3xSyPUmr6B2WXJ7kg=
-gorm.io/gorm v1.25.2 h1:gs1o6Vsa+oVKG/a9ElL3XgyGfghFfkKA2SInQaCyMho=
+gorm.io/gorm v1.31.1/go.mod h1:XyQVbO2k6YkOis7C2437jSit3SsDK72s7n7rsSHd+Gs=
-gorm.io/gorm v1.25.2/go.mod h1:L4uxeKpfBml98NYqVqwAdmV1a2nBtAec/cf3fpucW/k=

graph.go

@@ -11,6 +11,7 @@ import (
 	"strings"
 
 	"git.smarteching.com/zeni/go-chart/v2"
+	"git.smarteching.com/zeni/go-charts/v2"
 	"github.com/julienschmidt/httprouter"
 )
 
@@ -44,7 +45,7 @@ func Graph(w http.ResponseWriter, r *http.Request, ps httprouter.Params) {
 					qtyl := len(labels)
 					qtyv := len(values)
 
-					// cjeck qty and equal values from url
+					// check qty and equal values from url
 					if qtyl < 2 {
 						fmt.Fprintf(w, "Missing captions in pie")
 						return
@@ -85,9 +86,9 @@ func Graph(w http.ResponseWriter, r *http.Request, ps httprouter.Params) {
 					qtyl := len(labels)
 					qtyv := len(values)
 
-					// cjeck qty and equal values from url
+					// check qty and equal values from url
 					if qtyl < 2 {
-						fmt.Fprintf(w, "Missing captions in pie")
+						fmt.Fprintf(w, "Missing captions in bar")
 						return
 					}
 					if qtyv != qtyl {
@@ -116,6 +117,83 @@ func Graph(w http.ResponseWriter, r *http.Request, ps httprouter.Params) {
 						fmt.Printf("Error rendering pie chart: %v\n", err)
 					}
 
+				// case multiple graph bar
+				case "mbar":
+
+					queryValues := r.URL.Query()
+					labels := strings.Split(queryValues.Get("l"), "|")
+					values := strings.Split(queryValues.Get("v"), "|")
+					options := strings.Split(queryValues.Get("o"), "|")
+
+					qtyl := len(labels)
+					qtyv := len(values)
+					qtyo := len(options)
+
+					// check qty and equal values from url
+					if qtyl < 2 {
+						fmt.Fprintf(w, "Missing captions in bar")
+						return
+					}
+					if qtyv < 2 {
+						fmt.Fprintf(w, "Missing values in bar")
+						return
+					}
+					if qtyo < 2 {
+						fmt.Fprintf(w, "Missing options in bar")
+						return
+					}
+
+					valuest := [][]float64{
+						{
+							2.0,
+							4.9,
+							7.0,
+							23.2,
+							25.6,
+							76.7,
+							135.6,
+							162.2,
+							32.6,
+						},
+						{
+							2.6,
+							5.9,
+							9.0,
+							26.4,
+							28.7,
+							70.7,
+							175.6,
+							182.2,
+							48.7,
+						},
+					}
+					p, err := charts.BarRender(
+						valuest,
+						charts.XAxisDataOptionFunc([]string{
+							"Apr",
+							"May",
+							"Jun",
+							"Jul",
+							"Aug",
+							"Sep",
+							"Oct",
+							"Nov",
+							"Dec",
+						}),
+						charts.LegendLabelsOptionFunc(labels, charts.PositionRight),
+					)
+					if err != nil {
+						panic(err)
+					}
+
+					buf, err := p.Bytes()
+
+					w.Header().Set("Content-Type", "image/png")
+					w.Write(buf)
+					if err != nil {
+						fmt.Printf("Error rendering pie chart: %v\n", err)
+					}
+
 				default:
 					fmt.Fprintf(w, "Unknown graph %s!\n", kindg)
 				}

logger/logger.go

@@ -1,4 +1,4 @@
-// Copyright 2021 Harran Ali <harran.m@gmail.com>. All rights reserved.
+// Copyright (c) 2026 Zeni Kim <zenik@smarteching.com>
 // Use of this source code is governed by MIT-style
 // license that can be found in the LICENSE file.
 
@@ -8,16 +8,68 @@ import (
 	"io"
 	"log"
 	"os"
+	"strings"
 )
 
 // logs file
 var logsFile *os.File
 
+// ANSI color codes for terminal output
+const (
+	colorReset  = "\033[0m"
+	colorRed    = "\033[31m"
+	colorYellow = "\033[33m"
+	colorBlue   = "\033[34m"
+	colorCyan   = "\033[36m"
+)
+
+// Level represents a log severity level.
+type Level int
+
+const (
+	DEBUG Level = iota
+	INFO
+	WARNING
+	ERROR
+)
+
+// String returns the string representation of a log level.
+func (l Level) String() string {
+	switch l {
+	case DEBUG:
+		return "debug"
+	case INFO:
+		return "info"
+	case WARNING:
+		return "warning"
+	case ERROR:
+		return "error"
+	default:
+		return "unknown"
+	}
+}
+
+// coloredWriter wraps an io.Writer and replaces plain log prefixes with ANSI-colored ones
+// in the output stream. The original bytes pass through unmodified to any additional writers.
+type coloredWriter struct {
+	writer  io.Writer
+	plain   string
+	colored string
+}
+
+func (w *coloredWriter) Write(p []byte) (n int, err error) {
+	// Replace the plain prefix with the colored version in the output
+	colored := strings.Replace(string(p), w.plain, w.colored, 1)
+	return w.writer.Write([]byte(colored))
+}
+
 type Logger struct {
+	minLevel      Level
 	infoLogger    *log.Logger
 	warningLogger *log.Logger
 	errorLogger   *log.Logger
 	debugLogger   *log.Logger
+	file          *os.File
 }
 
 var l *Logger
@@ -40,9 +92,36 @@ func (f LogFileDriver) GetTarget() interface{} {
 	return f.FilePath
 }
 
+// levelPrefixes returns the plain and colored (with ANSI escapes) prefix strings for a given level.
+func levelPrefixes(level Level) (plain, colored string) {
+	switch level {
+	case INFO:
+		return "info: ", colorBlue + "INFO" + colorReset + ": "
+	case DEBUG:
+		return "debug: ", colorCyan + "DEBUG" + colorReset + ": "
+	case WARNING:
+		return "warning: ", colorYellow + "WARNING" + colorReset + ": "
+	case ERROR:
+		return "error: ", colorRed + "ERROR" + colorReset + ": "
+	default:
+		return "info: ", "INFO: "
+	}
+}
+
+// NewLogger creates a new Logger with the given driver and a minimum level of DEBUG (all levels logged).
 func NewLogger(driver LogsDriver) *Logger {
+	stdoutEnabled := os.Getenv("LOG_STDOUT_ENABLE") == "true"
+	return NewLoggerWithStdout(driver, DEBUG, stdoutEnabled)
+}
+
+// NewLoggerWithStdout creates a new Logger with the given driver, minimum log level,
+// and optionally writes to stdout in addition to the target file.
+// When stdoutEnabled is true, log messages are written to both the target and stdout.
+// ANSI color codes are applied to log prefixes in terminal output only.
+func NewLoggerWithStdout(driver LogsDriver, minLevel Level, stdoutEnabled bool) *Logger {
 	if driver.GetTarget() == nil {
 		l = &Logger{
+			minLevel:      minLevel,
 			infoLogger:    log.New(io.Discard, "info: ", log.LstdFlags),
 			warningLogger: log.New(io.Discard, "warning: ", log.LstdFlags),
 			errorLogger:   log.New(io.Discard, "error: ", log.LstdFlags),
@@ -54,41 +133,103 @@ func NewLogger(driver LogsDriver) *Logger {
 	if !ok {
 		panic("something wrong with the file path")
 	}
-	logsFile, err := os.OpenFile(path, os.O_CREATE|os.O_APPEND|os.O_RDWR, 0644)
+	var err error
+	logsFile, err = os.OpenFile(path, os.O_CREATE|os.O_APPEND|os.O_RDWR, 0644)
 	if err != nil {
 		panic(err)
 	}
-	l = &Logger{
+
-		infoLogger:    log.New(logsFile, "info: ", log.LstdFlags),
+	if stdoutEnabled {
-		warningLogger: log.New(logsFile, "warning: ", log.LstdFlags),
+		// Build each logger with a MultiWriter: the file gets the original plain output,
-		errorLogger:   log.New(logsFile, "error: ", log.LstdFlags),
+		// stdout gets the output with ANSI-colored prefixes.
-		debugLogger:   log.New(logsFile, "debug: ", log.LstdFlags),
+		infoPlain, infoColored := levelPrefixes(INFO)
+		debugPlain, debugColored := levelPrefixes(DEBUG)
+		warnPlain, warnColored := levelPrefixes(WARNING)
+		errPlain, errColored := levelPrefixes(ERROR)
+
+		l = &Logger{
+			minLevel: minLevel,
+			infoLogger: log.New(
+				io.MultiWriter(logsFile, &coloredWriter{writer: os.Stdout, plain: infoPlain, colored: infoColored}),
+				infoPlain, log.LstdFlags,
+			),
+			warningLogger: log.New(
+				io.MultiWriter(logsFile, &coloredWriter{writer: os.Stdout, plain: warnPlain, colored: warnColored}),
+				warnPlain, log.LstdFlags,
+			),
+			errorLogger: log.New(
+				io.MultiWriter(logsFile, &coloredWriter{writer: os.Stdout, plain: errPlain, colored: errColored}),
+				errPlain, log.LstdFlags,
+			),
+			debugLogger: log.New(
+				io.MultiWriter(logsFile, &coloredWriter{writer: os.Stdout, plain: debugPlain, colored: debugColored}),
+				debugPlain, log.LstdFlags,
+			),
+			file: logsFile,
+		}
+	} else {
+		// No stdout: all output goes to file with plain prefixes
+		l = &Logger{
+			minLevel:      minLevel,
+			infoLogger:    log.New(logsFile, "info: ", log.LstdFlags),
+			warningLogger: log.New(logsFile, "warning: ", log.LstdFlags),
+			errorLogger:   log.New(logsFile, "error: ", log.LstdFlags),
+			debugLogger:   log.New(logsFile, "debug: ", log.LstdFlags),
+			file:          logsFile,
+		}
 	}
 	return l
 }
 
+// NewLoggerWithLevel creates a new Logger with the given driver and minimum log level.
+// Messages below the minimum level will be discarded. Stdout output is disabled by default.
+func NewLoggerWithLevel(driver LogsDriver, minLevel Level) *Logger {
+	stdoutEnabled := os.Getenv("LOG_STDOUT_ENABLE") == "true"
+	return NewLoggerWithStdout(driver, minLevel, stdoutEnabled)
+}
+
+// SetLevel sets the minimum log level for the logger.
+// Messages below this level will be discarded.
+func (l *Logger) SetLevel(level Level) {
+	l.minLevel = level
+}
+
+// GetLevel returns the current minimum log level.
+func (l *Logger) GetLevel() Level {
+	return l.minLevel
+}
+
 func ResolveLogger() *Logger {
 	return l
 }
 
 func (l *Logger) Info(msg interface{}) {
-	l.infoLogger.Println(msg)
+	if l.minLevel <= INFO {
+		l.infoLogger.Println(msg)
+	}
 }
 
 func (l *Logger) Debug(msg interface{}) {
-	l.debugLogger.Println(msg)
+	if l.minLevel <= DEBUG {
+		l.debugLogger.Println(msg)
+	}
 }
 
 func (l *Logger) Warning(msg interface{}) {
-	l.warningLogger.Println(msg)
+	if l.minLevel <= WARNING {
+		l.warningLogger.Println(msg)
+	}
 }
 
 func (l *Logger) Error(msg interface{}) {
-	l.errorLogger.Println(msg)
+	if l.minLevel <= ERROR {
-}
+		l.errorLogger.Println(msg)
-
-func CloseLogsFile() {
-	if logsFile != nil {
-		defer logsFile.Close()
 	}
 }
+
+func (l *Logger) Close() error {
+	if l.file != nil {
+		return l.file.Close()
+	}
+	return nil
+}

logger/logger_test.go

@@ -61,7 +61,7 @@ func TestInfo(t *testing.T) {
 		t.Error("error testing info")
 	}
 	t.Cleanup(func() {
-		CloseLogsFile()
+		l.Close()
 	})
 }
 
@@ -84,7 +84,7 @@ func TestWarning(t *testing.T) {
 		t.Error("failed testing warning")
 	}
 	t.Cleanup(func() {
-		CloseLogsFile()
+		l.Close()
 	})
 }
 
@@ -106,7 +106,7 @@ func TestDebug(t *testing.T) {
 		t.Error("error testing debug")
 	}
 	t.Cleanup(func() {
-		CloseLogsFile()
+		l.Close()
 	})
 }
 
@@ -128,6 +128,173 @@ func TestError(t *testing.T) {
 		t.Error("failed testing error")
 	}
 	t.Cleanup(func() {
-		CloseLogsFile()
+		l.Close()
 	})
 }
+
+func TestLevelFiltering(t *testing.T) {
+	t.Run("NewLoggerWithLevel_DEBUG", func(t *testing.T) {
+		path := filepath.Join(t.TempDir(), uuid.NewString())
+		l := NewLoggerWithLevel(&LogFileDriver{FilePath: path}, DEBUG)
+		l.Debug("debug-msg")
+		l.Info("info-msg")
+		l.Warning("warn-msg")
+		l.Error("err-msg")
+		l.Close()
+
+		b, _ := os.ReadFile(path)
+		content := string(b)
+		if !strings.Contains(content, "debug-msg") {
+			t.Error("expected debug-msg to be logged at DEBUG level")
+		}
+		if !strings.Contains(content, "info-msg") {
+			t.Error("expected info-msg to be logged at DEBUG level")
+		}
+		if !strings.Contains(content, "warn-msg") {
+			t.Error("expected warn-msg to be logged at DEBUG level")
+		}
+		if !strings.Contains(content, "err-msg") {
+			t.Error("expected err-msg to be logged at DEBUG level")
+		}
+	})
+
+	t.Run("NewLoggerWithLevel_INFO", func(t *testing.T) {
+		path := filepath.Join(t.TempDir(), uuid.NewString())
+		l := NewLoggerWithLevel(&LogFileDriver{FilePath: path}, INFO)
+		l.Debug("debug-msg")
+		l.Info("info-msg")
+		l.Warning("warn-msg")
+		l.Error("err-msg")
+		l.Close()
+
+		b, _ := os.ReadFile(path)
+		content := string(b)
+		if strings.Contains(content, "debug-msg") {
+			t.Error("debug-msg should NOT be logged at INFO minimum level")
+		}
+		if !strings.Contains(content, "info-msg") {
+			t.Error("expected info-msg to be logged at INFO level")
+		}
+		if !strings.Contains(content, "warn-msg") {
+			t.Error("expected warn-msg to be logged at INFO level")
+		}
+		if !strings.Contains(content, "err-msg") {
+			t.Error("expected err-msg to be logged at INFO level")
+		}
+	})
+
+	t.Run("NewLoggerWithLevel_WARNING", func(t *testing.T) {
+		path := filepath.Join(t.TempDir(), uuid.NewString())
+		l := NewLoggerWithLevel(&LogFileDriver{FilePath: path}, WARNING)
+		l.Debug("debug-msg")
+		l.Info("info-msg")
+		l.Warning("warn-msg")
+		l.Error("err-msg")
+		l.Close()
+
+		b, _ := os.ReadFile(path)
+		content := string(b)
+		if strings.Contains(content, "debug-msg") {
+			t.Error("debug-msg should NOT be logged at WARNING minimum level")
+		}
+		if strings.Contains(content, "info-msg") {
+			t.Error("info-msg should NOT be logged at WARNING minimum level")
+		}
+		if !strings.Contains(content, "warn-msg") {
+			t.Error("expected warn-msg to be logged at WARNING level")
+		}
+		if !strings.Contains(content, "err-msg") {
+			t.Error("expected err-msg to be logged at WARNING level")
+		}
+	})
+
+	t.Run("NewLoggerWithLevel_ERROR", func(t *testing.T) {
+		path := filepath.Join(t.TempDir(), uuid.NewString())
+		l := NewLoggerWithLevel(&LogFileDriver{FilePath: path}, ERROR)
+		l.Debug("debug-msg")
+		l.Info("info-msg")
+		l.Warning("warn-msg")
+		l.Error("err-msg")
+		l.Close()
+
+		b, _ := os.ReadFile(path)
+		content := string(b)
+		if strings.Contains(content, "debug-msg") {
+			t.Error("debug-msg should NOT be logged at ERROR minimum level")
+		}
+		if strings.Contains(content, "info-msg") {
+			t.Error("info-msg should NOT be logged at ERROR minimum level")
+		}
+		if strings.Contains(content, "warn-msg") {
+			t.Error("warn-msg should NOT be logged at ERROR minimum level")
+		}
+		if !strings.Contains(content, "err-msg") {
+			t.Error("expected err-msg to be logged at ERROR level")
+		}
+	})
+
+	t.Run("SetLevel_dynamically", func(t *testing.T) {
+		path := filepath.Join(t.TempDir(), uuid.NewString())
+		l := NewLogger(&LogFileDriver{FilePath: path})
+
+		// Default is DEBUG, so debug messages are logged
+		l.Debug("debug-msg-before")
+		l.SetLevel(WARNING)
+		l.Debug("debug-msg-after")
+		l.Info("info-msg-after")
+		l.Warning("warn-msg-after")
+		l.Error("err-msg-after")
+		l.Close()
+
+		b, _ := os.ReadFile(path)
+		content := string(b)
+		if !strings.Contains(content, "debug-msg-before") {
+			t.Error("expected debug-msg-before to be logged before level change")
+		}
+		if strings.Contains(content, "debug-msg-after") {
+			t.Error("debug-msg-after should NOT be logged after setting level to WARNING")
+		}
+		if strings.Contains(content, "info-msg-after") {
+			t.Error("info-msg-after should NOT be logged after setting level to WARNING")
+		}
+		if !strings.Contains(content, "warn-msg-after") {
+			t.Error("expected warn-msg-after to be logged at WARNING level")
+		}
+		if !strings.Contains(content, "err-msg-after") {
+			t.Error("expected err-msg-after to be logged at WARNING level")
+		}
+	})
+}
+
+func TestLevelString(t *testing.T) {
+	tests := []struct {
+		level Level
+		want  string
+	}{
+		{DEBUG, "debug"},
+		{INFO, "info"},
+		{WARNING, "warning"},
+		{ERROR, "error"},
+		{Level(99), "unknown"},
+	}
+	for _, tt := range tests {
+		if got := tt.level.String(); got != tt.want {
+			t.Errorf("Level(%d).String() = %q, want %q", tt.level, got, tt.want)
+		}
+	}
+}
+
+func TestGetLevel(t *testing.T) {
+	path := filepath.Join(t.TempDir(), uuid.NewString())
+	l := NewLoggerWithLevel(&LogFileDriver{FilePath: path}, WARNING)
+	defer l.Close()
+
+	if l.GetLevel() != WARNING {
+		t.Errorf("GetLevel() = %d, want %d", l.GetLevel(), WARNING)
+	}
+
+	l.SetLevel(INFO)
+	if l.GetLevel() != INFO {
+		t.Errorf("GetLevel() after SetLevel(INFO) = %d, want %d", l.GetLevel(), INFO)
+	}
+}

queue.go

@@ -27,22 +27,32 @@ func (q *Queuemux) AddWork(pattern string, work Asynqtask) {
 	q.themux.HandleFunc(pattern, work)
 }
 
-// RunQueueserver starts the queue server with predefined configurations and handles tasks using the assigned ServeMux.
+// RunQueueserver starts the queue server with the given configuration and handles tasks using the assigned ServeMux.
 // Configures the queue server with concurrency limits and priority-based queue management.
 // Logs and terminates the program if the server fails to run.
-func (q *Queuemux) RunQueueserver() {
+func (q *Queuemux) RunQueueserver(config QueueConfig) {
 
 	redisAddr := fmt.Sprintf("%v:%v", os.Getenv("REDIS_HOST"), os.Getenv("REDIS_PORT"))
 
+	queues := config.Queues
+	if queues == nil {
+		queues = map[string]int{
+			"critical": 6,
+			"default":  3,
+			"low":      1,
+		}
+	}
+
+	concurrency := config.Concurrency
+	if concurrency <= 0 {
+		concurrency = 10
+	}
+
 	srv := asynq.NewServer(
 		asynq.RedisClientOpt{Addr: redisAddr},
-		asynq.Config{Concurrency: 10,
+		asynq.Config{
-			// Optionally specify multiple queues with different priority.
+			Concurrency: concurrency,
-			Queues: map[string]int{
+			Queues:      queues,
-				"critical": 6,
-				"default":  3,
-				"low":      1,
-			},
 		},
 	)
 

response.go

@@ -20,6 +20,7 @@ type Response struct {
 	overrideContentType string
 	isTerminated        bool
 	redirectTo          string
+	redirectStatusCode  int
 	HttpResponseWriter  http.ResponseWriter
 }
 
@@ -96,7 +97,7 @@ func (rs *Response) Template(name string, data interface{}) *Response {
 			panic(fmt.Sprintf("error executing template: %v", err))
 		}
 		rs.contentType = CONTENT_TYPE_HTML
-		buffer.WriteTo(rs.HttpResponseWriter)
+		rs.body = buffer.Bytes()
 	}
 	return rs
 }
@@ -136,14 +137,23 @@ func (rs *Response) ForceSendResponse() {
 	rs.isTerminated = true
 }
 
-// updates the redirect URL for the response and returns the modified Response. Validates the URL before setting it.
+// Redirect sends a redirect response to the given URL.
-func (rs *Response) Redirect(url string) *Response {
+// By default it uses 307 (Temporary Redirect) to preserve the HTTP method.
+// Pass true as the second argument to use 303 (See Other), which changes POST to GET.
+func (rs *Response) Redirect(url string, use303 ...bool) *Response {
 	validator := resolveValidator()
 	v := validator.Validate(map[string]interface{}{
 		"url": url,
 	}, map[string]interface{}{
 		"url": "url",
 	})
+
+    if len(use303) > 0 && use303[0] {
+        rs.redirectStatusCode = http.StatusSeeOther  // 303
+    } else {
+        rs.redirectStatusCode = http.StatusTemporaryRedirect  // 307 (default)
+    }
+
 	if v.Failed() {
 		if url[0:1] != "/" {
 			rs.redirectTo = "/" + url
@@ -153,6 +163,7 @@ func (rs *Response) Redirect(url string) *Response {
 		return rs
 	}
 	rs.redirectTo = url
+
 	return rs
 }
 

scheduler.go

@@ -0,0 +1,157 @@
+// Copyright (c) 2026 Jose Cely <me@jacs.guru>
+// Use of this source code is governed by MIT-style
+// license that can be found in the LICENSE file.
+
+package core
+
+import (
+	"context"
+	"fmt"
+	"log"
+	"time"
+
+	"git.smarteching.com/goffee/core/logger"
+	"git.smarteching.com/goffee/core/scheduler"
+)
+
+// Default values for SchedulerConfig
+var DefaultSchedulerInterval = 10 * time.Second
+var DefaultSchedulerRateLimit = 10
+
+// globalSchedulerMux holds the active Schedulermux instance so controllers
+// can access it without requiring a direct import chain.
+var globalSchedulerMux *Schedulermux
+
+// Schedulermux wraps the scheduler Registry and manages the lifecycle
+// of a simple database-backed task scheduler.
+type Schedulermux struct {
+	registry  *scheduler.Registry
+	store     *scheduler.Store
+	semaphore *scheduler.PersistedSemaphore
+	sched     *scheduler.Scheduler
+}
+
+// SchedulerInit initializes the scheduler internals (registry).
+// The store must be set separately via SetStore before starting.
+// The semaphore is created lazily during RunScheduler once the DB is available.
+func (s *Schedulermux) SchedulerInit() {
+	s.registry = scheduler.NewRegistry()
+	globalSchedulerMux = s
+}
+
+// SetStore sets the store (backed by *gorm.DB) on the scheduler.
+// This also runs AutoMigrate for the queue_items and processed_items tables.
+func (s *Schedulermux) SetStore(st *scheduler.Store) {
+	s.store = st
+}
+
+// AddWork registers a task handler function for a given task type.
+func (s *Schedulermux) AddWork(taskType string, handler scheduler.HandlerFunc) {
+	s.registry.Register(taskType, handler)
+}
+
+// GetStore returns the scheduler store, or nil if not initialized.
+func (s *Schedulermux) GetStore() *scheduler.Store {
+	return s.store
+}
+
+// RunScheduler starts the scheduler loop with the given configuration.
+// It auto-migrates the scheduler_meta table, recovers the persisted semaphore
+// state, creates the in-memory semaphore, and launches the scheduler goroutine.
+func (s *Schedulermux) RunScheduler(config SchedulerConfig) {
+	if s.store == nil {
+		log.Fatal("scheduler: store is not set — call SetStore before RunScheduler")
+	}
+
+	interval := config.SchedulerInterval
+	if interval <= 0 {
+		interval = DefaultSchedulerInterval
+	}
+
+	rateLimit := config.SchedulerRateLimit
+	if rateLimit < 0 {
+		rateLimit = DefaultSchedulerRateLimit
+	}
+
+	ctx := context.Background()
+
+	// Auto-migrate the scheduler_meta table for semaphore persistence.
+	_ = s.store.DB().AutoMigrate(&scheduler.SchedulerMeta{})
+
+	// Recover the persisted semaphore state (defaults to green).
+	wasGreen := s.store.GetSemaphore(ctx)
+	s.semaphore = scheduler.NewPersistedSemaphore(s.store, wasGreen)
+	logger.ResolveLogger().Info(fmt.Sprintf("[scheduler] semaphore recovered: %s", map[bool]string{true: "green", false: "red"}[wasGreen]))
+
+	// Recover stuck items from a previous crash before starting.
+	recovered, err := s.store.RecoverStuck(ctx)
+	if err != nil {
+		logger.ResolveLogger().Error(fmt.Sprintf("[scheduler] recover stuck error: %v", err))
+	} else if recovered > 0 {
+		logger.ResolveLogger().Info(fmt.Sprintf("[scheduler] recovered %d stuck task(s) back to pending", recovered))
+	}
+
+	s.sched = scheduler.NewScheduler(
+		scheduler.SchedulerConfig{
+			Interval:  interval,
+			RateLimit: rateLimit,
+		},
+		s.semaphore,
+		s.store,
+		s.registry,
+	)
+
+	s.sched.Start(ctx)
+}
+
+// StopScheduler gracefully stops the scheduler loop.
+func (s *Schedulermux) StopScheduler() {
+	if s.sched != nil {
+		s.sched.Stop()
+	}
+}
+
+// SemaphoreSetGreen allows task execution to proceed.
+func (s *Schedulermux) SemaphoreSetGreen() {
+	if s.semaphore != nil {
+		s.semaphore.SetGreen()
+	}
+}
+
+// SemaphoreSetRed blocks task execution.
+func (s *Schedulermux) SemaphoreSetRed() {
+	if s.semaphore != nil {
+		s.semaphore.SetRed()
+	}
+}
+
+// ResolveSchedulerStore returns the store from the global scheduler mux instance.
+// Returns nil if the scheduler was never initialized.
+func ResolveSchedulerStore() *scheduler.Store {
+	if globalSchedulerMux == nil {
+		return nil
+	}
+	return globalSchedulerMux.GetStore()
+}
+
+// SchedulerSemaphoreSetGreen enables task execution by setting the semaphore to green.
+func SchedulerSemaphoreSetGreen() {
+	if globalSchedulerMux != nil {
+		globalSchedulerMux.SemaphoreSetGreen()
+	}
+}
+
+// SchedulerSemaphoreSetRed blocks task execution by setting the semaphore to red.
+func SchedulerSemaphoreSetRed() {
+	if globalSchedulerMux != nil {
+		globalSchedulerMux.SemaphoreSetRed()
+	}
+}
+
+// SchedulerSemaphoreIsGreen returns whether the scheduler semaphore is currently green.
+func SchedulerSemaphoreIsGreen() bool {
+	if globalSchedulerMux == nil || globalSchedulerMux.semaphore == nil {
+		return false
+	}
+	return globalSchedulerMux.semaphore.IsGreen()
+}

scheduler/scheduler.go

@@ -0,0 +1,689 @@
+// Copyright (c) 2026 Jose Cely <me@jacs.guru>
+// Use of this source code is governed by MIT-style
+// license that can be found in the LICENSE file.
+
+package scheduler
+
+import (
+	"context"
+	"fmt"
+	"sync"
+	"time"
+
+	"git.smarteching.com/goffee/core/logger"
+	"gorm.io/gorm"
+	"gorm.io/gorm/clause"
+)
+
+// ─── Status types ────────────────────────────────────────────────────────────
+
+// QueueStatus represents the lifecycle state of a queued item.
+type QueueStatus string
+
+const (
+	StatusPending    QueueStatus = "pending"
+	StatusProcessing QueueStatus = "processing" // claimed by a scheduler tick
+)
+
+// ProcessedStatus is the final outcome recorded in processed_items.
+type ProcessedStatus string
+
+const (
+	ProcessedOK    ProcessedStatus = "ok"
+	ProcessedError ProcessedStatus = "error"
+)
+
+// ─── Models ──────────────────────────────────────────────────────────────────
+
+// QueueItem is a task waiting to be executed.
+// Any external program can insert a row into this table to enqueue work.
+//
+//	INSERT INTO queue_items (task_type, payload, priority, max_runs, thread) VALUES (?, ?, ?, ?, ?);
+type QueueItem struct {
+	ID        uint        `gorm:"primaryKey;autoIncrement"`
+	TaskType  string      `gorm:"not null;index"` // e.g. "send_email", "sync_records"
+	Payload   string      `gorm:"type:text"`      // JSON or plain string, interpreted by the handler
+	Status    QueueStatus `gorm:"not null;default:'pending';index"`
+	Priority  int         `gorm:"not null;default:0;index"` // higher = runs first within a tick
+	MaxRuns   int         `gorm:"not null;default:1"`       // 1 = run once, -1 = repeat indefinitely, N = run N times
+	Thread    int         `gorm:"not null;default:0"`       // 0 = sequential, 1 = concurrent per type
+	CreatedAt time.Time
+	UpdatedAt time.Time
+}
+
+// TableName overrides the GORM default.
+func (QueueItem) TableName() string { return "queue_items" }
+
+// ProcessedItem is an immutable record of a completed execution.
+// Rows are never updated — only inserted.
+type ProcessedItem struct {
+	ID          uint            `gorm:"primaryKey;autoIncrement"`
+	QueueItemID uint            `gorm:"not null;index"` // FK → queue_items.id (soft ref)
+	TaskType    string          `gorm:"not null;index"`
+	Payload     string          `gorm:"type:text"`
+	Status      ProcessedStatus `gorm:"not null;index"`
+	ErrorMsg    string          `gorm:"type:text"` // empty when Status == "ok"
+	StartedAt   time.Time       `gorm:"not null"`
+	FinishedAt  time.Time       `gorm:"not null"`
+	DurationMs  int64           `gorm:"not null"` // FinishedAt - StartedAt in ms
+	CreatedAt   time.Time
+}
+
+// TableName overrides the GORM default.
+func (ProcessedItem) TableName() string { return "processed_items" }
+
+// SchedulerMeta stores key-value metadata for the scheduler, such as the
+// semaphore state. This table persists across restarts so the scheduler can
+// recover its previous state.
+type SchedulerMeta struct {
+	Key   string `gorm:"primaryKey;size:64"`
+	Value string `gorm:"size:16;not null"`
+}
+
+// TableName overrides the GORM default.
+func (SchedulerMeta) TableName() string { return "scheduler_meta" }
+
+// ─── Handler ─────────────────────────────────────────────────────────────────
+
+// HandlerFunc processes a single queue item.
+// Return a non-nil error to mark the item as processed with error status.
+type HandlerFunc func(ctx context.Context, item *QueueItem) error
+
+// Registry maps task types to their handlers.
+// Register all handlers before calling Scheduler.Start.
+type Registry struct {
+	handlers map[string]HandlerFunc
+}
+
+// NewRegistry creates an empty handler registry.
+func NewRegistry() *Registry {
+	return &Registry{handlers: make(map[string]HandlerFunc)}
+}
+
+// Register associates a task type with a handler.
+// Panics on duplicate registration to catch misconfiguration at startup.
+func (r *Registry) Register(taskType string, h HandlerFunc) {
+	if _, exists := r.handlers[taskType]; exists {
+		panic(fmt.Sprintf("scheduler: handler already registered for task type %q", taskType))
+	}
+	r.handlers[taskType] = h
+}
+
+// get returns the handler for a task type, or a fallback error handler.
+func (r *Registry) get(taskType string) HandlerFunc {
+	if h, ok := r.handlers[taskType]; ok {
+		return h
+	}
+	return func(_ context.Context, item *QueueItem) error {
+		return fmt.Errorf("no handler registered for task type %q", item.TaskType)
+	}
+}
+
+// ─── Store ───────────────────────────────────────────────────────────────────
+
+// Store handles all database operations for the scheduler.
+type Store struct {
+	db *gorm.DB
+}
+
+// NewStore creates a Store.
+// Tables (queue_items, processed_items)
+func NewStore(db *gorm.DB) (*Store, error) {
+	if db == nil {
+		return nil, fmt.Errorf("scheduler: db is nil")
+	}
+	return &Store{db: db}, nil
+}
+
+// DB returns the underlying *gorm.DB used by the store.
+func (s *Store) DB() *gorm.DB {
+	return s.db
+}
+
+// Enqueue inserts a new pending task.
+// maxRuns controls how many times the task executes: 1 = once (default), -1 = repeat indefinitely.
+// thread controls concurrency: 0 = sequential per type, 1 = concurrent per type.
+// Any value of maxRuns < -1 is clamped to 1.
+func (s *Store) Enqueue(ctx context.Context, taskType, payload string, priority, maxRuns, thread int) (*QueueItem, error) {
+	if maxRuns < -1 {
+		maxRuns = 1
+	}
+	item := &QueueItem{
+		TaskType: taskType,
+		Payload:  payload,
+		Status:   StatusPending,
+		Priority: priority,
+		MaxRuns:  maxRuns,
+		Thread:   thread,
+	}
+	if err := s.db.WithContext(ctx).Create(item).Error; err != nil {
+		return nil, fmt.Errorf("enqueue %s: %w", taskType, err)
+	}
+	return item, nil
+}
+
+// ClaimBatch atomically claims up to `limit` pending tasks and marks them
+// as "processing" so that concurrent scheduler instances never double-execute.
+func (s *Store) ClaimBatch(ctx context.Context, limit int) ([]*QueueItem, error) {
+	var items []*QueueItem
+
+	err := s.db.WithContext(ctx).Transaction(func(tx *gorm.DB) error {
+		query := tx.
+			Clauses(clause.Locking{Strength: "UPDATE", Options: "SKIP LOCKED"}).
+			Where("status = ?", StatusPending).
+			Order("priority DESC, id ASC").
+			Limit(limit).
+			Find(&items)
+
+		if query.Error != nil {
+			return query.Error
+		}
+		if len(items) == 0 {
+			return nil
+		}
+
+		ids := make([]uint, len(items))
+		for i, it := range items {
+			ids[i] = it.ID
+		}
+
+		return tx.Model(&QueueItem{}).
+			Where("id IN ?", ids).
+			Update("status", StatusProcessing).
+			Error
+	})
+
+	if err != nil {
+		return nil, fmt.Errorf("claim batch: %w", err)
+	}
+	return items, nil
+}
+
+// RecordResult writes a ProcessedItem, then either deletes the QueueItem (if
+// MaxRuns is exhausted) or decrements MaxRuns and resets the status to pending
+// for re-execution on the next tick. A maxRuns of -1 means repeat indefinitely.
+func (s *Store) RecordResult(ctx context.Context, item *QueueItem, startedAt time.Time, execErr error) error {
+	finishedAt := time.Now()
+
+	status := ProcessedOK
+	errMsg := ""
+	if execErr != nil {
+		status = ProcessedError
+		errMsg = execErr.Error()
+	}
+
+	processed := &ProcessedItem{
+		QueueItemID: item.ID,
+		TaskType:    item.TaskType,
+		Payload:     item.Payload,
+		Status:      status,
+		ErrorMsg:    errMsg,
+		StartedAt:   startedAt,
+		FinishedAt:  finishedAt,
+		DurationMs:  finishedAt.Sub(startedAt).Milliseconds(),
+	}
+
+	return s.db.WithContext(ctx).Transaction(func(tx *gorm.DB) error {
+		// 1. Insert the immutable result record.
+		if err := tx.Create(processed).Error; err != nil {
+			return fmt.Errorf("insert processed_item: %w", err)
+		}
+
+		// 2. Decide: delete the queue item or re-queue it.
+		// MaxRuns == 1 means "run once" — delete.
+		// MaxRuns == -1 means "repeat indefinitely" — always re-queue.
+		// MaxRuns > 1 means "run N times" — decrement and re-queue.
+		if item.MaxRuns == 1 {
+			// Exhausted — delete.
+			if err := tx.Delete(&QueueItem{}, item.ID).Error; err != nil {
+				return fmt.Errorf("delete queue_item %d: %w", item.ID, err)
+			}
+		} else {
+			// Decrement MaxRuns (if not -1/infinite) and set back to pending.
+			newMaxRuns := item.MaxRuns
+			if newMaxRuns > 1 {
+				newMaxRuns--
+			}
+			if err := tx.Model(&QueueItem{}).
+				Where("id = ?", item.ID).
+				Updates(map[string]interface{}{
+					"status":   StatusPending,
+					"max_runs": newMaxRuns,
+				}).Error; err != nil {
+				return fmt.Errorf("re-queue queue_item %d: %w", item.ID, err)
+			}
+		}
+
+		return nil
+	})
+}
+
+// SemaphoreKey is the key used in scheduler_meta for the semaphore state.
+const SemaphoreKey = "semaphore"
+
+// SemaphoreValueGreen is the stored value for a green semaphore.
+const SemaphoreValueGreen = "green"
+
+// SemaphoreValueRed is the stored value for a red semaphore.
+const SemaphoreValueRed = "red"
+
+// SetSemaphore persists the semaphore state to the database.
+func (s *Store) SetSemaphore(ctx context.Context, green bool) error {
+	value := SemaphoreValueRed
+	if green {
+		value = SemaphoreValueGreen
+	}
+	return s.db.WithContext(ctx).Transaction(func(tx *gorm.DB) error {
+		var count int64
+		tx.Model(&SchedulerMeta{}).Where("key = ?", SemaphoreKey).Count(&count)
+		if count == 0 {
+			return tx.Create(&SchedulerMeta{Key: SemaphoreKey, Value: value}).Error
+		}
+		return tx.Model(&SchedulerMeta{}).
+			Where("key = ?", SemaphoreKey).
+			Update("value", value).Error
+	})
+}
+
+// GetSemaphore reads the persisted semaphore state from the database.
+// Returns true if green, false if red or not found.
+func (s *Store) GetSemaphore(ctx context.Context) bool {
+	var meta SchedulerMeta
+	err := s.db.WithContext(ctx).Where("key = ?", SemaphoreKey).First(&meta).Error
+	if err != nil || meta.Value != SemaphoreValueGreen {
+		return false
+	}
+	return true
+}
+
+// PendingCount returns the number of tasks currently in pending or processing state.
+func (s *Store) PendingCount(ctx context.Context) (int64, error) {
+	var count int64
+	err := s.db.WithContext(ctx).
+		Model(&QueueItem{}).
+		Where("status IN ?", []QueueStatus{StatusPending, StatusProcessing}).
+		Count(&count).Error
+	return count, err
+}
+
+// RecentProcessed returns the last `n` processed items ordered by newest first.
+func (s *Store) RecentProcessed(ctx context.Context, n int) ([]*ProcessedItem, error) {
+	var items []*ProcessedItem
+	err := s.db.WithContext(ctx).
+		Order("id DESC").
+		Limit(n).
+		Find(&items).Error
+	return items, err
+}
+
+// RecoverStuck resets any items stuck in "processing" state (e.g. after a
+// crash) back to "pending" so they can be re-claimed on the next tick.
+// Call this once at startup.
+func (s *Store) RecoverStuck(ctx context.Context) (int64, error) {
+	result := s.db.WithContext(ctx).
+		Model(&QueueItem{}).
+		Where("status = ?", StatusProcessing).
+		Update("status", StatusPending)
+	return result.RowsAffected, result.Error
+}
+
+// ─── Semaphore ───────────────────────────────────────────────────────────────
+
+// Semaphore is the interface for the scheduler kill switch.
+// Green (true) means tasks can run; Red (false) means tasks are blocked.
+type Semaphore interface {
+	SetGreen()
+	SetRed()
+	IsGreen() bool
+}
+
+// inMemorySemaphore is the default channel-based implementation.
+type inMemorySemaphore struct {
+	green chan bool
+}
+
+// NewSemaphore creates a Semaphore. Pass true to start green, false to start red.
+func NewSemaphore(startGreen bool) Semaphore {
+	s := &inMemorySemaphore{green: make(chan bool, 1)}
+	s.green <- startGreen
+	return s
+}
+
+func (s *inMemorySemaphore) SetGreen() {
+	<-s.green
+	s.green <- true
+}
+
+func (s *inMemorySemaphore) SetRed() {
+	<-s.green
+	s.green <- false
+}
+
+func (s *inMemorySemaphore) IsGreen() bool {
+	val := <-s.green
+	s.green <- val
+	return val
+}
+
+// PersistedSemaphore implements Semaphore and persists every state change to
+// the database via the Store, so the state survives application restarts.
+type PersistedSemaphore struct {
+	inner Semaphore
+	store *Store
+	ctx   context.Context
+}
+
+// NewPersistedSemaphore creates a PersistedSemaphore with an initial state.
+func NewPersistedSemaphore(store *Store, startGreen bool) *PersistedSemaphore {
+	return &PersistedSemaphore{
+		inner: NewSemaphore(startGreen),
+		store: store,
+		ctx:   context.Background(),
+	}
+}
+
+// SetGreen allows task execution and persists the state.
+func (ps *PersistedSemaphore) SetGreen() {
+	ps.inner.SetGreen()
+	_ = ps.store.SetSemaphore(ps.ctx, true)
+}
+
+// SetRed blocks task execution and persists the state.
+func (ps *PersistedSemaphore) SetRed() {
+	ps.inner.SetRed()
+	_ = ps.store.SetSemaphore(ps.ctx, false)
+}
+
+// IsGreen reports whether execution is currently allowed.
+func (ps *PersistedSemaphore) IsGreen() bool {
+	return ps.inner.IsGreen()
+}
+
+// ─── Scheduler ───────────────────────────────────────────────────────────────
+
+// Scheduler polls the database every interval and executes pending tasks.
+type Scheduler struct {
+	interval  time.Duration
+	rateLimit int // max tasks per tick; 0 = unlimited
+	semaphore Semaphore
+	store     *Store
+	registry  *Registry
+
+	stop chan struct{}
+	done chan struct{}
+}
+
+// SchedulerConfig holds constructor options.
+type SchedulerConfig struct {
+	Interval  time.Duration
+	RateLimit int // 0 = unlimited
+}
+
+// NewScheduler creates a Scheduler.
+func NewScheduler(cfg SchedulerConfig, sem Semaphore, st *Store, reg *Registry) *Scheduler {
+	return &Scheduler{
+		interval:  cfg.Interval,
+		rateLimit: cfg.RateLimit,
+		semaphore: sem,
+		store:     st,
+		registry:  reg,
+		stop:      make(chan struct{}),
+		done:      make(chan struct{}),
+	}
+}
+
+// Start launches the scheduler goroutine.
+func (s *Scheduler) Start(ctx context.Context) {
+	go s.run(ctx)
+}
+
+// Stop signals the scheduler and waits for it to exit cleanly.
+func (s *Scheduler) Stop() {
+	close(s.stop)
+	<-s.done
+}
+
+// run is the main event loop.
+func (s *Scheduler) run(ctx context.Context) {
+	defer close(s.done)
+
+	ticker := time.NewTicker(s.interval)
+	defer ticker.Stop()
+
+	for {
+		select {
+		case <-ctx.Done():
+			logger.ResolveLogger().Info("[scheduler] context cancelled, shutting down")
+			return
+		case <-s.stop:
+			logger.ResolveLogger().Info("[scheduler] stop requested, shutting down")
+			return
+		case t := <-ticker.C:
+			s.tick(ctx, t)
+		}
+	}
+}
+
+// tick runs on every ticker event.
+func (s *Scheduler) tick(ctx context.Context, t time.Time) {
+	ts := t.Format(time.TimeOnly)
+
+	if !s.semaphore.IsGreen() {
+		logger.ResolveLogger().Info(fmt.Sprintf("[scheduler] tick %s — semaphore RED, skipping", ts))
+		return
+	}
+
+	limit := s.rateLimit
+	if limit == 0 {
+		limit = 1000
+	}
+
+	items, err := s.store.ClaimBatch(ctx, limit)
+	if err != nil {
+		logger.ResolveLogger().Error(fmt.Sprintf("[scheduler] tick %s — claim error: %v", ts, err))
+		return
+	}
+	if len(items) == 0 {
+		return
+	}
+
+	logger.ResolveLogger().Info(fmt.Sprintf("[scheduler] tick %s — executing %d task(s)", ts, len(items)))
+
+	// Split items into sequential vs concurrent groups.
+	var sequential []*QueueItem
+	concurrentGroups := make(map[string][]*QueueItem) // taskType -> items
+
+	for _, item := range items {
+		if item.Thread != 0 {
+			concurrentGroups[item.TaskType] = append(concurrentGroups[item.TaskType], item)
+		} else {
+			sequential = append(sequential, item)
+		}
+	}
+
+	// Execute sequential items one at a time.
+	for i, item := range sequential {
+		s.execute(ctx, item, i+1, len(items))
+	}
+
+	// Execute concurrent groups in parallel per type.
+	for _, group := range concurrentGroups {
+		s.executeGroup(ctx, group, len(items))
+	}
+
+	if remaining, err := s.store.PendingCount(ctx); err == nil {
+		logger.ResolveLogger().Info(fmt.Sprintf("[scheduler] tick %s — done (%d task(s) still queued)", ts, remaining))
+	}
+}
+
+// execute runs a task's handler one or more times within the same tick.
+// When Thread=0 (sequential), runs execute one after another in a loop.
+// When Thread=1 (concurrent), runs fire simultaneously in goroutines.
+// The number of runs per tick is capped by the rate limit, and the item
+// is re-queued with remaining runs or deleted when exhausted.
+func (s *Scheduler) execute(ctx context.Context, item *QueueItem, pos, total int) {
+	// Determine how many runs to fire this tick.
+	desiredRuns := item.MaxRuns
+	if desiredRuns < 1 {
+		desiredRuns = 1 // -1 (infinite): one batch per tick
+	}
+
+	// Cap by the rate limit so one item cannot exhaust the tick budget.
+	budget := s.rateLimit
+	if budget <= 0 {
+		budget = 1000
+	}
+	if desiredRuns > budget {
+		desiredRuns = budget
+	}
+
+	remainingRuns := 0
+	if item.MaxRuns == -1 {
+		remainingRuns = -1
+	} else {
+		remainingRuns = item.MaxRuns - desiredRuns
+		if remainingRuns < 0 {
+			remainingRuns = 0
+		}
+	}
+
+	isConcurrent := item.Thread != 0
+	if isConcurrent {
+		logger.ResolveLogger().Info(fmt.Sprintf("[scheduler] [%d/%d] task id=%d type=%s firing %d/%d concurrent run(s)", pos, total, item.ID, item.TaskType, desiredRuns, item.MaxRuns))
+	} else {
+		logger.ResolveLogger().Info(fmt.Sprintf("[scheduler] [%d/%d] task id=%d type=%s firing %d/%d sequential run(s)", pos, total, item.ID, item.TaskType, desiredRuns, item.MaxRuns))
+	}
+
+	if isConcurrent {
+		// ── Concurrent: all runs in parallel goroutines ──
+		var wg sync.WaitGroup
+		wg.Add(desiredRuns)
+
+		for i := 0; i < desiredRuns; i++ {
+			go func(runIdx int) {
+				defer wg.Done()
+				startedAt := time.Now()
+				handler := s.registry.get(item.TaskType)
+				execErr := handler(ctx, item)
+
+				finishedAt := time.Now()
+				elapsed := finishedAt.Sub(startedAt).Milliseconds()
+
+				status := ProcessedOK
+				errMsg := ""
+				if execErr != nil {
+					status = ProcessedError
+					errMsg = execErr.Error()
+				}
+
+				processed := &ProcessedItem{
+					QueueItemID: item.ID,
+					TaskType:    item.TaskType,
+					Payload:     item.Payload,
+					Status:      status,
+					ErrorMsg:    errMsg,
+					StartedAt:   startedAt,
+					FinishedAt:  finishedAt,
+					DurationMs:  elapsed,
+				}
+				if err := s.store.db.WithContext(ctx).Create(processed).Error; err != nil {
+					logger.ResolveLogger().Error(fmt.Sprintf("[scheduler] [%d/%d] failed to record processed_item for id=%d run=%d: %v", pos, total, item.ID, runIdx+1, err))
+				}
+
+				if execErr != nil {
+					logger.ResolveLogger().Error(fmt.Sprintf("[scheduler] [%d/%d] task id=%d run=%d FAILED after %dms: %v", pos, total, item.ID, runIdx+1, elapsed, execErr))
+				} else {
+					logger.ResolveLogger().Info(fmt.Sprintf("[scheduler] [%d/%d] task id=%d run=%d OK (%dms)", pos, total, item.ID, runIdx+1, elapsed))
+				}
+			}(i)
+		}
+
+		wg.Wait()
+	} else {
+		// ── Sequential: all runs one after another ──
+		for i := 0; i < desiredRuns; i++ {
+			startedAt := time.Now()
+			handler := s.registry.get(item.TaskType)
+			execErr := handler(ctx, item)
+
+			finishedAt := time.Now()
+			elapsed := finishedAt.Sub(startedAt).Milliseconds()
+
+			status := ProcessedOK
+			errMsg := ""
+			if execErr != nil {
+				status = ProcessedError
+				errMsg = execErr.Error()
+			}
+
+			processed := &ProcessedItem{
+				QueueItemID: item.ID,
+				TaskType:    item.TaskType,
+				Payload:     item.Payload,
+				Status:      status,
+				ErrorMsg:    errMsg,
+				StartedAt:   startedAt,
+				FinishedAt:  finishedAt,
+				DurationMs:  elapsed,
+			}
+			if err := s.store.db.WithContext(ctx).Create(processed).Error; err != nil {
+				logger.ResolveLogger().Error(fmt.Sprintf("[scheduler] [%d/%d] failed to record processed_item for id=%d run=%d: %v", pos, total, item.ID, i+1, err))
+			}
+
+			if execErr != nil {
+				logger.ResolveLogger().Error(fmt.Sprintf("[scheduler] [%d/%d] task id=%d run=%d FAILED after %dms: %v", pos, total, item.ID, i+1, elapsed, execErr))
+			} else {
+				logger.ResolveLogger().Info(fmt.Sprintf("[scheduler] [%d/%d] task id=%d run=%d OK (%dms)", pos, total, item.ID, i+1, elapsed))
+			}
+		}
+	}
+
+	// ── After all runs: decide the queue item's fate ──
+	if remainingRuns == -1 {
+		if err := s.store.db.WithContext(ctx).
+			Model(&QueueItem{}).
+			Where("id = ?", item.ID).
+			Updates(map[string]interface{}{
+				"status":   StatusPending,
+				"max_runs": -1,
+			}).Error; err != nil {
+			logger.ResolveLogger().Error(fmt.Sprintf("[scheduler] [%d/%d] failed to re-queue infinite item id=%d: %v", pos, total, item.ID, err))
+		}
+		logger.ResolveLogger().Info(fmt.Sprintf("[scheduler] [%d/%d] task id=%d re-queued for next tick (infinite)", pos, total, item.ID))
+	} else if remainingRuns > 0 {
+		if err := s.store.db.WithContext(ctx).
+			Model(&QueueItem{}).
+			Where("id = ?", item.ID).
+			Updates(map[string]interface{}{
+				"status":   StatusPending,
+				"max_runs": remainingRuns,
+			}).Error; err != nil {
+			logger.ResolveLogger().Error(fmt.Sprintf("[scheduler] [%d/%d] failed to re-queue item id=%d with %d remaining runs: %v", pos, total, item.ID, remainingRuns, err))
+		}
+		logger.ResolveLogger().Info(fmt.Sprintf("[scheduler] [%d/%d] task id=%d re-queued with %d run(s) remaining", pos, total, item.ID, remainingRuns))
+	} else {
+		if err := s.store.db.WithContext(ctx).Delete(&QueueItem{}, item.ID).Error; err != nil {
+			logger.ResolveLogger().Error(fmt.Sprintf("[scheduler] [%d/%d] failed to delete finished item id=%d: %v", pos, total, item.ID, err))
+		}
+		logger.ResolveLogger().Info(fmt.Sprintf("[scheduler] [%d/%d] task id=%d all runs exhausted, deleted", pos, total, item.ID))
+	}
+}
+
+// executeGroup runs all items in a group concurrently using goroutines.
+// Each item's result is recorded independently.
+func (s *Scheduler) executeGroup(ctx context.Context, items []*QueueItem, total int) {
+	var wg sync.WaitGroup
+	wg.Add(len(items))
+
+	for _, item := range items {
+		item := item // capture range variable
+		go func() {
+			defer wg.Done()
+			// Find the item's position among all items for logging context.
+			// Since we don't have global position here, use a local index.
+			s.execute(ctx, item, 0, total)
+		}()
+	}
+
+	wg.Wait()
+}

session.go

@@ -0,0 +1,146 @@
+// Copyright (c) 2026 Zeni Kim <zenik@smarteching.com>
+// Use of this source code is governed by MIT-style
+// license that can be found in the LICENSE file.
+
+package core
+
+import (
+	"crypto/md5"
+	"encoding/json"
+	"fmt"
+	"sync"
+	"time"
+)
+
+// SessionUser handles user session data management with thread-safe operations.
+// Sessions are stored in the cache (Redis) and are tied to an authenticated user
+// via JWT tokens stored in cookies.
+type SessionUser struct {
+	mu               sync.RWMutex
+	context          *Context
+	userID           uint
+	hashedSessionKey string
+	authenticated    bool
+	sessionStart     time.Time
+	values           map[string]interface{}
+}
+
+// Init initializes the session by validating the user's JWT token from the cookie.
+// It checks the cached token, verifies it matches, and loads any existing session data.
+// Returns true if the session was successfully established.
+func (s *SessionUser) Init(c *Context) bool {
+	s.context = c
+
+	// get cookie
+	usercookie, err := c.GetCookie()
+	if err != nil || usercookie.Token == "" {
+		return false
+	}
+
+	payload, err := c.GetJWT().DecodeToken(usercookie.Token)
+	if err != nil {
+		return false
+	}
+
+	userID := uint(c.CastToInt(payload["userID"]))
+	userAgent := c.GetUserAgent()
+
+	// verify token against cached value
+	hashedCacheKey := CreateAuthTokenHashedCacheKey(userID, userAgent)
+	cachedToken, err := c.GetCache().Get(hashedCacheKey)
+	if err != nil || cachedToken != usercookie.Token {
+		return false
+	}
+
+	// session established - load session data from cache
+	userAgent = c.GetUserAgent()
+	sessionKey := fmt.Sprintf("sess_%v", userAgent)
+	s.hashedSessionKey = CreateAuthTokenHashedCacheKey(userID, sessionKey)
+	s.values = make(map[string]interface{})
+	s.authenticated = true
+	s.userID = userID
+
+	value, _ := c.GetCache().Get(s.hashedSessionKey)
+	if len(value) > 0 {
+		_ = json.Unmarshal([]byte(value), &s.values)
+	}
+
+	return true
+}
+
+// Set stores a value in the session and persists it to the cache.
+func (s *SessionUser) Set(key string, value interface{}) error {
+	s.mu.Lock()
+	s.values[key] = value
+	s.mu.Unlock()
+	return s.Save()
+}
+
+// Get retrieves a value from the session. Returns the value and a boolean indicating if the key exists.
+func (s *SessionUser) Get(key string) (interface{}, bool) {
+	s.mu.RLock()
+	defer s.mu.RUnlock()
+	val, ok := s.values[key]
+	return val, ok
+}
+
+// Delete removes a specific key from the session and persists the change.
+// Returns the deleted value if it existed.
+func (s *SessionUser) Delete(key string) interface{} {
+	s.mu.RLock()
+	v, ok := s.values[key]
+	s.mu.RUnlock()
+	if ok {
+		s.mu.Lock()
+		delete(s.values, key)
+		s.mu.Unlock()
+	}
+	s.Save()
+	return v
+}
+
+// Flush deletes all session data from the cache.
+func (s *SessionUser) Flush() error {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	if s.hashedSessionKey != "" {
+		_ = s.context.GetCache().Delete(s.hashedSessionKey)
+	}
+	s.values = make(map[string]interface{})
+	s.authenticated = false
+	return nil
+}
+
+// Save persists the current session values to the cache.
+func (s *SessionUser) Save() error {
+	s.mu.RLock()
+	defer s.mu.RUnlock()
+
+	if len(s.values) > 0 {
+		buf, err := json.Marshal(&s.values)
+		if err != nil {
+			return err
+		}
+		return s.context.GetCache().Set(s.hashedSessionKey, string(buf))
+	}
+
+	_ = s.context.GetCache().Delete(s.hashedSessionKey)
+	return nil
+}
+
+// GetUserID returns the user ID of the authenticated session user.
+func (s *SessionUser) GetUserID() uint {
+	return s.userID
+}
+
+// IsAuthenticated returns whether the session has been successfully authenticated.
+func (s *SessionUser) IsAuthenticated() bool {
+	return s.authenticated
+}
+
+// CreateAuthTokenHashedCacheKey generates a hashed cache key used to store JWT tokens and session data.
+// The key is based on the user ID and user agent, hashed with MD5.
+func CreateAuthTokenHashedCacheKey(userID uint, userAgent string) string {
+	cacheKey := fmt.Sprintf("userid:_%v_useragent:_%v_jwt_token", userID, userAgent)
+	return fmt.Sprintf("%x", md5.Sum([]byte(cacheKey)))
+}

templates.go

@@ -1,4 +1,4 @@
-// Copyright (c) 2024 Zeni Kim <zenik@smarteching.com>
+// Copyright (c) 2026 Zeni Kim <zenik@smarteching.com>
 // Use of this source code is governed by MIT-style
 // license that can be found in the LICENSE file.
 
@@ -6,15 +6,337 @@ package core
 
 import (
 	"embed"
+	"fmt"
 	"html/template"
 	"io/fs"
+	"math"
+	"reflect"
 	"strings"
+	"time"
+	"unicode"
+	"golang.org/x/text/language"
+	"golang.org/x/text/message"
 )
 
 var tmpl *template.Template = nil
 
+// ─────────────────────────────────────────────
+// Struct helpers
+// ─────────────────────────────────────────────
+
+// hasField checks if a struct has a given field name.
+// It can be used inside Go html/templates like:
+//
+//	{{if hasField . "FieldA"}}<a>{{.FieldA}}</a>{{end}}
+func hasField(v interface{}, name string) bool {
+	rv := reflect.ValueOf(v)
+	if rv.Kind() == reflect.Ptr {
+		rv = rv.Elem()
+	}
+	if rv.Kind() != reflect.Struct {
+		return false
+	}
+	return rv.FieldByName(name).IsValid()
+}
+
+// ─────────────────────────────────────────────
+// String helpers
+// ─────────────────────────────────────────────
+
+// capitalize uppercases the first letter of a string and lowercases the rest.
+//
+//	{{capitalize "hello world"}} → "Hello world"
+func capitalize(s string) string {
+	if s == "" {
+		return ""
+	}
+	runes := []rune(s)
+	runes[0] = unicode.ToUpper(runes[0])
+	for i := 1; i < len(runes); i++ {
+		runes[i] = unicode.ToLower(runes[i])
+	}
+	return string(runes)
+}
+
+// prepend adds a prefix string to the beginning of s.
+//
+//	{{prepend "World" "Hello, "}} → "Hello, World"
+func prepend(s, prefix string) string {
+	return prefix + s
+}
+
+// strAppend adds a suffix string to the end of s.
+// Named strAppend to avoid collision with the builtin append keyword.
+//
+//	{{strAppend "Hello" "!"}} → "Hello!"
+func strAppend(s, suffix string) string {
+	return s + suffix
+}
+
+// split divides s into a slice of substrings separated by sep.
+// Useful when combined with range in templates.
+//
+//	{{range split .Tags ","}}...{{end}}
+func split(s, sep string) []string {
+	return strings.Split(s, sep)
+}
+
+// truncate cuts s to at most n characters. Designed for pipeline use:
+//   {{.Title | truncate 30}}
+func truncate(n int, s string) string {
+    runes := []rune(s)
+    if len(runes) <= n {
+        return s
+    }
+    return string(runes[:n]) + "…"
+}
+
+// ─────────────────────────────────────────────
+// Number helpers
+// ─────────────────────────────────────────────
+
+// fmtNumber formats an integer or float with thousands separators
+// using the English locale (e.g. 1000000 → "1,000,000").
+//
+//	{{fmtNumber .Price}}
+func fmtNumber(v interface{}) string {
+	p := message.NewPrinter(language.English)
+	switch n := v.(type) {
+	case int:
+		return p.Sprintf("%d", n)
+	case int64:
+		return p.Sprintf("%d", n)
+	case float64:
+		// trim unnecessary trailing zeros
+		formatted := p.Sprintf("%.2f", n)
+		return formatted
+	case float32:
+		return p.Sprintf("%.2f", n)
+	default:
+		return fmt.Sprintf("%v", v)
+	}
+}
+
+// ─────────────────────────────────────────────
+// Date & time helpers
+// ─────────────────────────────────────────────
+
+// fmtDate formats a time.Time value using a named layout or a custom Go layout string.
+// Named layouts: "short" → "02 Jan 2006", "long" → "02 January 2006",
+// "iso" → "2006-01-02", "datetime" → "02 Jan 2006 15:04".
+// Any other string is used directly as a Go time layout.
+//
+//	{{fmtDate .PublishedAt "short"}}
+//	{{fmtDate .CreatedAt "02/01/2006"}}
+func fmtDate(t time.Time, layout string) string {
+	switch layout {
+	case "short":
+		return t.Format("02 Jan 2006")
+	case "long":
+		return t.Format("02 January 2006")
+	case "iso":
+		return t.Format("2006-01-02")
+	case "datetime":
+		return t.Format("02 Jan 2006 15:04")
+	default:
+		return t.Format(layout)
+	}
+}
+
+// timeAgo returns a human-readable relative time string from now.
+//
+//	{{timeAgo .PublishedAt}} → "3 hours ago", "2 days ago", "just now"
+func timeAgo(t time.Time) string {
+	diff := time.Since(t)
+
+	switch {
+	case diff < time.Minute:
+		return "just now"
+	case diff < time.Hour:
+		m := int(math.Round(diff.Minutes()))
+		return plural(m, "minute") + " ago"
+	case diff < 24*time.Hour:
+		h := int(math.Round(diff.Hours()))
+		return plural(h, "hour") + " ago"
+	case diff < 7*24*time.Hour:
+		d := int(math.Round(diff.Hours() / 24))
+		return plural(d, "day") + " ago"
+	case diff < 30*24*time.Hour:
+		w := int(math.Round(diff.Hours() / 24 / 7))
+		return plural(w, "week") + " ago"
+	case diff < 365*24*time.Hour:
+		mo := int(math.Round(diff.Hours() / 24 / 30))
+		return plural(mo, "month") + " ago"
+	default:
+		y := int(math.Round(diff.Hours() / 24 / 365))
+		return plural(y, "year") + " ago"
+	}
+}
+
+// plural is an internal helper that returns "1 item" or "N items".
+func plural(n int, unit string) string {
+	if n == 1 {
+		return fmt.Sprintf("%d %s", n, unit)
+	}
+	return fmt.Sprintf("%d %ss", n, unit)
+}
+
+// ─────────────────────────────────────────────
+// Collection helpers
+// ─────────────────────────────────────────────
+
+// first returns the first element of a slice, or nil if empty.
+//
+//	{{with first .Items}}{{.Name}}{{end}}
+func first(slice interface{}) interface{} {
+	rv := reflect.ValueOf(slice)
+	if rv.Kind() != reflect.Slice || rv.Len() == 0 {
+		return nil
+	}
+	return rv.Index(0).Interface()
+}
+
+// last returns the last element of a slice, or nil if empty.
+//
+//	{{with last .Items}}{{.Name}}{{end}}
+func last(slice interface{}) interface{} {
+	rv := reflect.ValueOf(slice)
+	if rv.Kind() != reflect.Slice || rv.Len() == 0 {
+		return nil
+	}
+	return rv.Index(rv.Len() - 1).Interface()
+}
+
+// sliceOf returns a sub-range of a slice from index start (inclusive) to end (exclusive).
+// Named sliceOf to avoid collision with the builtin slice expression.
+//
+//	{{range sliceOf .Items 0 3}}...{{end}}
+func sliceOf(slice interface{}, start, end int) interface{} {
+	rv := reflect.ValueOf(slice)
+	if rv.Kind() != reflect.Slice {
+		return nil
+	}
+	if start < 0 {
+		start = 0
+	}
+	if end > rv.Len() {
+		end = rv.Len()
+	}
+	return rv.Slice(start, end).Interface()
+}
+
+// contains reports whether item is present in slice (or substr in a string).
+//
+//	{{if contains .Tags "go"}}...{{end}}
+//	{{if contains .Bio "engineer"}}...{{end}}
+func contains(collection, item interface{}) bool {
+	// string substring check
+	if s, ok := collection.(string); ok {
+		if sub, ok := item.(string); ok {
+			return strings.Contains(s, sub)
+		}
+		return false
+	}
+	rv := reflect.ValueOf(collection)
+	if rv.Kind() != reflect.Slice {
+		return false
+	}
+	for i := 0; i < rv.Len(); i++ {
+		if reflect.DeepEqual(rv.Index(i).Interface(), item) {
+			return true
+		}
+	}
+	return false
+}
+
+// join concatenates the elements of a string slice with sep as separator.
+//
+//	{{join .Tags ", "}}
+func join(slice []string, sep string) string {
+	return strings.Join(slice, sep)
+}
+
+// ─────────────────────────────────────────────
+// Logic helpers
+// ─────────────────────────────────────────────
+
+// defaultVal returns fallback if value is the zero value or an empty string.
+//
+//	{{defaultVal "N/A" .OptionalField}}
+func defaultVal(fallback, value interface{}) interface{} {
+	if value == nil {
+		return fallback
+	}
+	rv := reflect.ValueOf(value)
+	if rv.IsZero() {
+		return fallback
+	}
+	return value
+}
+
+// ternary returns trueVal if condition is true, falseVal otherwise.
+//
+//	{{ternary "Active" "Inactive" .IsActive}}
+func ternary(trueVal, falseVal interface{}, condition bool) interface{} {
+	if condition {
+		return trueVal
+	}
+	return falseVal
+}
+
+// coalesce returns the first non-empty, non-nil value from the provided list.
+//
+//	{{coalesce .Nickname .FullName "Anonymous"}}
+func coalesce(values ...interface{}) interface{} {
+	for _, v := range values {
+		if v == nil {
+			continue
+		}
+		rv := reflect.ValueOf(v)
+		if !rv.IsZero() {
+			return v
+		}
+	}
+	return nil
+}
+
+// ─────────────────────────────────────────────
+// FuncMap registry
+// ─────────────────────────────────────────────
+
+func funcMap() template.FuncMap {
+	return template.FuncMap{
+		// Struct
+		"hasField": hasField,
+		// String
+		"capitalize": capitalize,
+		"prepend":    prepend,
+		"strAppend":  strAppend,
+		"split":      split,
+		"truncate":   truncate,
+		// Number
+		"fmtNumber": fmtNumber,
+		// Date & time
+		"fmtDate": fmtDate,
+		"timeAgo": timeAgo,
+		// Collections
+		"first":   first,
+		"last":    last,
+		"sliceOf": sliceOf,
+		"contains": contains,
+		"join":    join,
+		// Logic
+		"defaultVal": defaultVal,
+		"ternary":    ternary,
+		"coalesce":   coalesce,
+	}
+}
+
+// ─────────────────────────────────────────────
+// Template initializer
+// ─────────────────────────────────────────────
+
 func NewTemplates(components embed.FS, templates embed.FS) {
-	// templates
 	var paths []string
 	fs.WalkDir(components, ".", func(path string, d fs.DirEntry, err error) error {
 		if strings.Contains(d.Name(), ".html") {
@@ -31,6 +353,28 @@ func NewTemplates(components embed.FS, templates embed.FS) {
 		return nil
 	})
 
-	tmpla := template.Must(template.ParseFS(components, paths...))
+	tmpl = template.Must(
-	tmpl = template.Must(tmpla.ParseFS(templates, pathst...))
+		template.New("").
+			Funcs(funcMap()).
+			ParseFS(components, paths...),
+	)
+	tmpl = template.Must(tmpl.ParseFS(templates, pathst...))
+}
+
+
+// RenderNamedTemplate executes a named template from the registered set with
+// the given data and returns the rendered HTML.
+// Usage:
+//
+//	html, err := core.RenderNamedTemplate("tabler_table", data)
+//	if err != nil {
+//	    // handle error
+//	}
+//	return c.Response.HTML(string(html))
+func RenderNamedTemplate(name string, data interface{}) (template.HTML, error) {
+	var buf strings.Builder
+	if err := tmpl.ExecuteTemplate(&buf, name, data); err != nil {
+		return "", fmt.Errorf("failed to execute template %q: %w", name, err)
+	}
+	return template.HTML(buf.String()), nil
 }