package i18n

import (
	"os"
	"path/filepath"
	"testing"
)

func TestTranslator(t *testing.T) {
	// Create temporary test translations
	tmpDir := t.TempDir()

	enFile := filepath.Join(tmpDir, "en.json")
	enContent := `{
		"menu": {
			"home": "Home",
			"search": "Search"
		},
		"editor": {
			"confirmDelete": "Are you sure you want to delete {{filename}}?"
		}
	}`
	if err := os.WriteFile(enFile, []byte(enContent), 0644); err != nil {
		t.Fatal(err)
	}

	frFile := filepath.Join(tmpDir, "fr.json")
	frContent := `{
		"menu": {
			"home": "Accueil",
			"search": "Rechercher"
		},
		"editor": {
			"confirmDelete": "Êtes-vous sûr de vouloir supprimer {{filename}} ?"
		}
	}`
	if err := os.WriteFile(frFile, []byte(frContent), 0644); err != nil {
		t.Fatal(err)
	}

	// Test translator
	trans := New("en")
	if err := trans.LoadFromDir(tmpDir); err != nil {
		t.Fatalf("Failed to load translations: %v", err)
	}

	tests := []struct {
		name     string
		lang     string
		key      string
		args     map[string]string
		expected string
	}{
		{
			name:     "English simple key",
			lang:     "en",
			key:      "menu.home",
			expected: "Home",
		},
		{
			name:     "French simple key",
			lang:     "fr",
			key:      "menu.search",
			expected: "Rechercher",
		},
		{
			name:     "English with interpolation",
			lang:     "en",
			key:      "editor.confirmDelete",
			args:     map[string]string{"filename": "test.md"},
			expected: "Are you sure you want to delete test.md?",
		},
		{
			name:     "French with interpolation",
			lang:     "fr",
			key:      "editor.confirmDelete",
			args:     map[string]string{"filename": "test.md"},
			expected: "Êtes-vous sûr de vouloir supprimer test.md ?",
		},
		{
			name:     "Missing key returns key",
			lang:     "en",
			key:      "missing.key",
			expected: "missing.key",
		},
		{
			name:     "Fallback to default language",
			lang:     "es", // Spanish not loaded, should fallback to English
			key:      "menu.home",
			expected: "Home",
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			var result string
			if tt.args != nil {
				result = trans.T(tt.lang, tt.key, tt.args)
			} else {
				result = trans.T(tt.lang, tt.key)
			}

			if result != tt.expected {
				t.Errorf("T(%s, %s) = %s, want %s", tt.lang, tt.key, result, tt.expected)
			}
		})
	}

	// Test GetAvailableLanguages
	langs := trans.GetAvailableLanguages()
	if len(langs) != 2 {
		t.Errorf("Expected 2 languages, got %d", len(langs))
	}

	// Test GetTranslations
	enTrans, ok := trans.GetTranslations("en")
	if !ok {
		t.Error("Expected to find English translations")
	}
	if enTrans == nil {
		t.Error("English translations should not be nil")
	}
}