// Copyright (c) 2024 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 (
	"bytes"
	"embed"
	"fmt"
	"html/template"
	"io/fs"
	"net/http"
	"strings"
)

type Template struct {
	tmpl *template.Template
}

func (t *Template) NewTemplates(resources embed.FS) {
	var paths []string
	fs.WalkDir(resources, ".", func(path string, d fs.DirEntry, err error) error {
		if strings.Contains(d.Name(), ".html") {
			paths = append(paths, path)
		}
		return nil
	})

	t.tmpl = template.Must(template.ParseFS(resources, paths...))
}

func (t *Template) Render(w http.ResponseWriter, name string, data interface{}) {
	var buffer bytes.Buffer

	err := t.tmpl.ExecuteTemplate(&buffer, name, data)
	if err != nil {
		err = fmt.Errorf("error executing template: %w", err)
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	w.Header().Set("Content-Type", "text/html; charset=UTF-8")
	buffer.WriteTo(w)
}