package language

import (
	"testing"

	"voicesnap/internal/config"
	"voicesnap/internal/model"
)

type fakeDetector struct {
	locale string
}

func (f fakeDetector) Detect() string {
	return f.locale
}

func TestNormalizeLocale(t *testing.T) {
	tests := map[string]string{
		"zh-CN":       model.DefaultLanguageID,
		"zh_Hans_CN":  model.DefaultLanguageID,
		"en-US":       model.EnglishLanguageID,
		"en_GB.UTF-8": model.EnglishLanguageID,
		"fr-FR":       model.EnglishLanguageID,
		"":            model.EnglishLanguageID,
	}
	for input, want := range tests {
		if got := NormalizeLocale(input); got != want {
			t.Fatalf("NormalizeLocale(%q) = %q, want %q", input, got, want)
		}
	}
}

func TestResolveAutoUsesDetector(t *testing.T) {
	settings := Resolve(config.LanguageModeAuto, model.DefaultLanguageID, fakeDetector{locale: "en-US"})
	if settings.EffectiveLanguageID != model.EnglishLanguageID {
		t.Fatalf("effective language = %q, want %q", settings.EffectiveLanguageID, model.EnglishLanguageID)
	}
	if settings.UILocale != "en" {
		t.Fatalf("ui locale = %q, want en", settings.UILocale)
	}
	if settings.DefaultModelID != model.MoonshineModelID {
		t.Fatalf("default model = %q, want %q", settings.DefaultModelID, model.MoonshineModelID)
	}
}

func TestResolveManualIgnoresDetector(t *testing.T) {
	settings := Resolve(config.LanguageModeManual, model.DefaultLanguageID, fakeDetector{locale: "en-US"})
	if settings.EffectiveLanguageID != model.DefaultLanguageID {
		t.Fatalf("effective language = %q, want %q", settings.EffectiveLanguageID, model.DefaultLanguageID)
	}
	if settings.UILocale != "zh" {
		t.Fatalf("ui locale = %q, want zh", settings.UILocale)
	}
}

func TestResolveFallsBackInvalidValues(t *testing.T) {
	settings := Resolve("bad-mode", "bad-language", fakeDetector{locale: "fr-FR"})
	if settings.LanguageMode != config.LanguageModeAuto {
		t.Fatalf("mode = %q, want %q", settings.LanguageMode, config.LanguageModeAuto)
	}
	if settings.EffectiveLanguageID != model.EnglishLanguageID {
		t.Fatalf("effective language = %q, want %q", settings.EffectiveLanguageID, model.EnglishLanguageID)
	}
}

func TestResolveOptionsAreStable(t *testing.T) {
	settings := Resolve(config.LanguageModeAuto, model.DefaultLanguageID, fakeDetector{locale: "zh-CN"})
	if len(settings.Options) != 2 {
		t.Fatalf("options len = %d, want 2", len(settings.Options))
	}
	if settings.Options[0].ID != model.DefaultLanguageID {
		t.Fatalf("first option = %q, want %q", settings.Options[0].ID, model.DefaultLanguageID)
	}
	if settings.Options[1].ID != model.EnglishLanguageID {
		t.Fatalf("second option = %q, want %q", settings.Options[1].ID, model.EnglishLanguageID)
	}
}