package logger

import (
	"io"
	"os"
	"path/filepath"
	"strings"
	"testing"

	"github.com/google/uuid"
)

func TestNewLogger(t *testing.T) {
	fp := filepath.Join(t.TempDir(), uuid.NewString())
	f, err := os.Create(fp)
	if err != nil {
		t.Errorf("failed test new logger")
	}
	f.Close()
	l := NewLogger(&LogNullDriver{})
	l.Info("testing")
	fdrv := &LogFileDriver{
		fp,
	}
	trgt := fdrv.GetTarget()
	ts, ok := trgt.(string)
	if !ok {
		t.Errorf("failed test new logger")
	}
	if ts != fp {
		t.Errorf("failed test new logger")
	}
	l = NewLogger(fdrv)
	l.Error("test-err")
	f, err = os.Open(fp)
	if err != nil {
		t.Errorf("failed test new logger")
	}
	defer f.Close()
	b, err := io.ReadAll(f)
	if !strings.Contains(string(b), "test-err") {
		t.Errorf("failed test new logger")
	}
}

func TestInfo(t *testing.T) {
	path := filepath.Join(t.TempDir(), uuid.NewString())
	l := NewLogger(&LogFileDriver{
		FilePath: path,
	})
	l.Info("DFT2V56H")
	lf, err := os.Open(path)
	if err != nil {
		t.Error("failed testing info")
	}
	d, err := io.ReadAll(lf)
	if err != nil {
		t.Error("error testing info")
	}
	if !strings.Contains(string(d), "DFT2V56H") {
		t.Error("error testing info")
	}
	t.Cleanup(func() {
		l.Close()
	})
}

func TestWarning(t *testing.T) {
	path := filepath.Join(t.TempDir(), uuid.NewString())
	l := NewLogger(&LogFileDriver{
		FilePath: path,
	})

	l.Warning("DFT2V56H")
	lf, err := os.Open(path)
	if err != nil {
		t.Error("failed testing warning")
	}
	d, err := io.ReadAll(lf)
	if err != nil {
		t.Error("failed testing warning")
	}
	if !strings.Contains(string(d), "DFT2V56H") {
		t.Error("failed testing warning")
	}
	t.Cleanup(func() {
		l.Close()
	})
}

func TestDebug(t *testing.T) {
	path := filepath.Join(t.TempDir(), uuid.NewString())
	l := NewLogger(&LogFileDriver{
		FilePath: path,
	})
	l.Debug("DFT2V56H")
	lf, err := os.Open(path)
	if err != nil {
		t.Error("failed testing debug")
	}
	d, err := io.ReadAll(lf)
	if err != nil {
		t.Error("error testing debug")
	}
	if !strings.Contains(string(d), "DFT2V56H") {
		t.Error("error testing debug")
	}
	t.Cleanup(func() {
		l.Close()
	})
}

func TestError(t *testing.T) {
	path := filepath.Join(t.TempDir(), uuid.NewString())
	l := NewLogger(&LogFileDriver{
		FilePath: path,
	})
	l.Error("DFT2V56H")
	lf, err := os.Open(path)
	if err != nil {
		t.Error("failed testing error")
	}
	d, err := io.ReadAll(lf)
	if err != nil {
		t.Error("failed testing error")
	}
	if !strings.Contains(string(d), "DFT2V56H") {
		t.Error("failed testing error")
	}
	t.Cleanup(func() {
		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)
	}
}