package storage

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

	"gitea.mrixs.me/Mrixs/yandex-music-api-go/yandexmusic"
)

func TestStorageNew(t *testing.T) {
	tmpDir := t.TempDir()

	s, err := NewStorage(tmpDir, true)
	if err != nil {
		t.Fatalf("NewStorage failed: %v", err)
	}
	if s == nil {
		t.Fatal("expected non-nil storage")
	}
}

func TestStorageSaveAndLoadTrack(t *testing.T) {
	tmpDir := t.TempDir()

	s, err := NewStorage(tmpDir, true)
	if err != nil {
		t.Fatalf("NewStorage failed: %v", err)
	}

	meta := TrackMeta{
		TrackID:      "123",
		AlbumID:      "456",
		ArtistID:     "789",
		Title:        "Test Track",
		ArtistName:   "Test Artist",
		AlbumTitle:   "Test Album",
		TrackNumber:  1,
		DiscNumber:   1,
		DurationMs:   180000,
		Bitrate:      320,
		Codec:        "mp3",
		DownloadedAt: time.Now().Format(time.RFC3339),
	}

	data := []byte("fake audio data")

	if err := s.SaveTrack(meta, data, nil); err != nil {
		t.Fatalf("SaveTrack failed: %v", err)
	}

	// Check index
	if !s.IsTrackDownloaded("123") {
		t.Error("track not marked as downloaded")
	}

	loadedMeta, ok := s.GetTrackMeta("123")
	if !ok {
		t.Fatal("track not found in index")
	}
	if loadedMeta.Title != "Test Track" {
		t.Errorf("expected title 'Test Track', got '%s'", loadedMeta.Title)
	}
	if loadedMeta.FileSize != int64(len(data)) {
		t.Errorf("expected file size %d, got %d", len(data), loadedMeta.FileSize)
	}
	// Check file exists using the stored path
	if _, err := os.Stat(loadedMeta.FilePath); os.IsNotExist(err) {
		t.Error("track file not created")
	}
}

func TestStorageIdempotent(t *testing.T) {
	tmpDir := t.TempDir()

	s, err := NewStorage(tmpDir, true)
	if err != nil {
		t.Fatalf("NewStorage failed: %v", err)
	}

	meta := TrackMeta{
		TrackID:     "123",
		Title:       "Test Track",
		ArtistName:  "Test Artist",
		AlbumTitle:  "Test Album",
		TrackNumber: 1,
		Codec:       "mp3",
	}

	data := []byte("fake audio data")

	// Save first time
	if err := s.SaveTrack(meta, data, nil); err != nil {
		t.Fatalf("first SaveTrack failed: %v", err)
	}

	firstPath := meta.FilePath

	// Save second time (should not create duplicate)
	if err := s.SaveTrack(meta, data, nil); err != nil {
		t.Fatalf("second SaveTrack failed: %v", err)
	}

	if meta.FilePath != firstPath {
		t.Errorf("file path changed on second save: %s vs %s", meta.FilePath, firstPath)
	}

	// Verify only one file exists
	files, _ := os.ReadDir(filepath.Join(tmpDir, "Test Artist", "Test Album"))
	count := 0
	for _, f := range files {
		if !f.IsDir() {
			count++
		}
	}
	if count != 1 {
		t.Errorf("expected 1 file, found %d", count)
	}
}

func TestStorageOrganizeFalse(t *testing.T) {
	tmpDir := t.TempDir()

	s, err := NewStorage(tmpDir, false)
	if err != nil {
		t.Fatalf("NewStorage failed: %v", err)
	}

	meta := TrackMeta{
		TrackID:      "123",
		Title:        "Test Track",
		ArtistName:   "Test Artist",
		AlbumTitle:   "Test Album",
		TrackNumber:  1,
		Codec:        "mp3",
		DownloadedAt: time.Now().Format(time.RFC3339),
	}

	data := []byte("fake audio data")

	if err := s.SaveTrack(meta, data, nil); err != nil {
		t.Fatalf("SaveTrack failed: %v", err)
	}

	// Should be flat structure - get the saved meta from index
	loadedMeta, ok := s.GetTrackMeta("123")
	if !ok {
		t.Fatal("track not found in index")
	}
	expectedDir := tmpDir
	if filepath.Dir(loadedMeta.FilePath) != expectedDir {
		t.Errorf("expected flat structure in %s, got %s", expectedDir, filepath.Dir(loadedMeta.FilePath))
	}
}

func TestStorageSanitizeFilename(t *testing.T) {
	tests := []struct {
		input    string
		expected string
	}{
		{"normal", "normal"},
		{"with/slash", "with_slash"},
		{"with\\backslash", "with_backslash"},
		{"with:colon", "with_colon"},
		{"with*star", "with_star"},
		{"with?question", "with_question"},
		{"with\"quote", "with_quote"},
		{"with<lt", "with_lt"},
		{"with>gt", "with_gt"},
		{"with|pipe", "with_pipe"},
	}

	for _, tc := range tests {
		result := sanitizeFilename(tc.input)
		if result != tc.expected {
			t.Errorf("sanitizeFilename(%q) = %q, want %q", tc.input, result, tc.expected)
		}
	}
}

func TestStorageBuildTrackMetaFromYandex(t *testing.T) {
	track := &yandexmusic.Track{
		ID:          "123",
		Title:       "Test Track",
		Genre:       "Pop",
		DurationMs:  180000,
		Artists: []yandexmusic.Artist{
			{ID: "789", Name: "Test Artist"},
		},
		Albums: []yandexmusic.Album{
			{ID: "456", Title: "Test Album"},
		},
	}

	album := &yandexmusic.Album{
		ID:           "456",
		Title:        "Test Album",
		Genre:        "Album Pop",
		Year:         2023,
		ReleaseDate:  "2023-05-15",
		Label:        "Test Label",
		Description:  "Test album description",
		CatalogNumber: "TC-001",
		Artists: []yandexmusic.Artist{
			{ID: "789", Name: "Test Artist"},
		},
	}

	downloadInfo := yandexmusic.DownloadInfo{
		Bitrate: 320,
		Codec:   "mp3",
	}

	meta := BuildTrackMetaFromYandex(track, album, 1, 1, downloadInfo)

	if meta.TrackID != "123" {
		t.Errorf("expected track ID 123, got %s", meta.TrackID)
	}
	if meta.Title != "Test Track" {
		t.Errorf("expected title 'Test Track', got '%s'", meta.Title)
	}
	if meta.ArtistName != "Test Artist" {
		t.Errorf("expected artist 'Test Artist', got '%s'", meta.ArtistName)
	}
	if meta.AlbumTitle != "Test Album" {
		t.Errorf("expected album 'Test Album', got '%s'", meta.AlbumTitle)
	}
	if meta.Bitrate != 320 {
		t.Errorf("expected bitrate 320, got %d", meta.Bitrate)
	}
	if meta.Codec != "mp3" {
		t.Errorf("expected codec mp3, got %s", meta.Codec)
	}
	// Extended metadata checks
	if meta.Genre != "Pop" {
		t.Errorf("expected genre 'Pop', got '%s'", meta.Genre)
	}
	if meta.Comment != "Test album description" {
		t.Errorf("expected comment 'Test album description', got '%s'", meta.Comment)
	}
	if meta.Lyrics != "" {
		t.Errorf("expected empty lyrics (no lyrics in track), got '%s'", meta.Lyrics)
	}
	if meta.Publisher != "Test Label" {
		t.Errorf("expected publisher 'Test Label', got '%s'", meta.Publisher)
	}
	if meta.EncodedBy != "ym-dl" {
		t.Errorf("expected encoded_by 'ym-dl', got '%s'", meta.EncodedBy)
	}
	if meta.OriginalYear != "2023" {
		t.Errorf("expected original_year '2023', got '%s'", meta.OriginalYear)
	}
	if meta.Copyright != "TC-001" {
		t.Errorf("expected copyright 'TC-001', got '%s'", meta.Copyright)
	}
}

func TestStorageBuildAlbumMetaFromYandex(t *testing.T) {
	album := &yandexmusic.Album{
		ID:    "456",
		Title: "Test Album",
		Artists: []yandexmusic.Artist{
			{ID: "789", Name: "Test Artist"},
		},
		Year: 2023,
	}

	tracks := []TrackMeta{
		{TrackID: "1", Title: "Track 1"},
		{TrackID: "2", Title: "Track 2"},
	}

	meta := BuildAlbumMetaFromYandex(album, tracks)

	if meta.AlbumID != "456" {
		t.Errorf("expected album ID 456, got %s", meta.AlbumID)
	}
	if meta.Title != "Test Album" {
		t.Errorf("expected title 'Test Album', got '%s'", meta.Title)
	}
	if meta.ArtistName != "Test Artist" {
		t.Errorf("expected artist 'Test Artist', got '%s'", meta.ArtistName)
	}
	if meta.Year != 2023 {
		t.Errorf("expected year 2023, got %d", meta.Year)
	}
	if meta.TrackCount != 2 {
		t.Errorf("expected track count 2, got %d", meta.TrackCount)
	}
}