v6.8

backend/amazon.go

@@ -142,9 +142,24 @@ func (a *AmazonDownloader) GetAmazonURLFromSpotify(spotifyTrackID string) (strin
 	}
 	defer resp.Body.Close()
 
+	// Read body first to handle encoding issues and provide better error messages
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return "", fmt.Errorf("failed to read response body: %w", err)
+	}
+
+	if len(body) == 0 {
+		return "", fmt.Errorf("API returned empty response")
+	}
+
 	var songLinkResp SongLinkResponse
-	if err := json.NewDecoder(resp.Body).Decode(&songLinkResp); err != nil {
-		return "", fmt.Errorf("failed to decode response: %w", err)
+	if err := json.Unmarshal(body, &songLinkResp); err != nil {
+		// Truncate body for error message (max 200 chars)
+		bodyStr := string(body)
+		if len(bodyStr) > 200 {
+			bodyStr = bodyStr[:200] + "..."
+		}
+		return "", fmt.Errorf("failed to decode response: %w (response: %s)", err, bodyStr)
 	}
 
 	amazonLink, ok := songLinkResp.LinksByPlatform["amazonMusic"]

backend/deezer.go

@@ -82,13 +82,28 @@ func (d *DeezerDownloader) GetDeezerURLFromSpotify(spotifyTrackID string) (strin
 		return "", fmt.Errorf("API returned status %d", resp.StatusCode)
 	}
 
+	// Read body first to handle encoding issues
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return "", fmt.Errorf("failed to read response body: %w", err)
+	}
+
+	if len(body) == 0 {
+		return "", fmt.Errorf("API returned empty response")
+	}
+
 	var songLinkResp struct {
 		LinksByPlatform map[string]struct {
 			URL string `json:"url"`
 		} `json:"linksByPlatform"`
 	}
-	if err := json.NewDecoder(resp.Body).Decode(&songLinkResp); err != nil {
-		return "", fmt.Errorf("failed to decode response: %w", err)
+	if err := json.Unmarshal(body, &songLinkResp); err != nil {
+		// Truncate body for error message (max 200 chars)
+		bodyStr := string(body)
+		if len(bodyStr) > 200 {
+			bodyStr = bodyStr[:200] + "..."
+		}
+		return "", fmt.Errorf("failed to decode response: %w (response: %s)", err, bodyStr)
 	}
 
 	deezerLink, ok := songLinkResp.LinksByPlatform["deezer"]
@@ -134,12 +149,28 @@ func (d *DeezerDownloader) GetTrackByID(trackID int64) (*DeezerTrack, error) {
 	defer resp.Body.Close()
 
 	if resp.StatusCode != 200 {
-		return nil, fmt.Errorf("API returned status %d", resp.StatusCode)
+		body, _ := io.ReadAll(resp.Body)
+		return nil, fmt.Errorf("API returned status %d: %s", resp.StatusCode, string(body))
+	}
+
+	// Read body first to handle encoding issues and provide better error messages
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return nil, fmt.Errorf("failed to read response body: %w", err)
+	}
+
+	if len(body) == 0 {
+		return nil, fmt.Errorf("API returned empty response")
 	}
 
 	var track DeezerTrack
-	if err := json.NewDecoder(resp.Body).Decode(&track); err != nil {
-		return nil, fmt.Errorf("failed to decode response: %w", err)
+	if err := json.Unmarshal(body, &track); err != nil {
+		// Truncate body for error message (max 200 chars)
+		bodyStr := string(body)
+		if len(bodyStr) > 200 {
+			bodyStr = bodyStr[:200] + "..."
+		}
+		return nil, fmt.Errorf("failed to decode response: %w (response: %s)", err, bodyStr)
 	}
 
 	if track.ID == 0 {
@@ -160,9 +191,24 @@ func (d *DeezerDownloader) GetDownloadURL(trackID int64) (string, error) {
 	}
 	defer resp.Body.Close()
 
+	// Read body first to handle encoding issues and provide better error messages
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return "", fmt.Errorf("failed to read response body: %w", err)
+	}
+
+	if len(body) == 0 {
+		return "", fmt.Errorf("API returned empty response")
+	}
+
 	var apiResp DeezMateResponse
-	if err := json.NewDecoder(resp.Body).Decode(&apiResp); err != nil {
-		return "", fmt.Errorf("failed to decode API response: %w", err)
+	if err := json.Unmarshal(body, &apiResp); err != nil {
+		// Truncate body for error message (max 200 chars)
+		bodyStr := string(body)
+		if len(bodyStr) > 200 {
+			bodyStr = bodyStr[:200] + "..."
+		}
+		return "", fmt.Errorf("failed to decode API response: %w (response: %s)", err, bodyStr)
 	}
 
 	if !apiResp.Success || apiResp.Links.FLAC == "" {

backend/ffmpeg.go

@@ -0,0 +1,544 @@
+package backend
+
+import (
+	"archive/tar"
+	"archive/zip"
+	"encoding/base64"
+	"fmt"
+	"io"
+	"net/http"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"runtime"
+	"strings"
+	"sync"
+	"time"
+
+	"github.com/ulikunitz/xz"
+)
+
+// decodeBase64 decodes a base64 encoded string
+func decodeBase64(encoded string) (string, error) {
+	decoded, err := base64.StdEncoding.DecodeString(encoded)
+	if err != nil {
+		return "", err
+	}
+	return string(decoded), nil
+}
+
+const (
+	ffmpegWindowsURL = "aHR0cHM6Ly9naXRodWIuY29tL0J0Yk4vRkZtcGVnLUJ1aWxkcy9yZWxlYXNlcy9kb3dubG9hZC9sYXRlc3QvZmZtcGVnLW1hc3Rlci1sYXRlc3Qtd2luNjQtZ3BsLnppcA=="
+	ffmpegLinuxURL   = "aHR0cHM6Ly9naXRodWIuY29tL0J0Yk4vRkZtcGVnLUJ1aWxkcy9yZWxlYXNlcy9kb3dubG9hZC9sYXRlc3QvZmZtcGVnLW1hc3Rlci1sYXRlc3QtbGludXg2NC1ncGwudGFyLnh6"
+	ffmpegMacOSURL   = "aHR0cHM6Ly9ldmVybWVldC5jeC9mZm1wZWcvZ2V0cmVsZWFzZS9mZm1wZWcvemlw"
+)
+
+// GetFFmpegDir returns the directory where ffmpeg should be stored
+func GetFFmpegDir() (string, error) {
+	homeDir, err := os.UserHomeDir()
+	if err != nil {
+		return "", fmt.Errorf("failed to get home directory: %w", err)
+	}
+	return filepath.Join(homeDir, ".spotiflac"), nil
+}
+
+// GetFFmpegPath returns the full path to the ffmpeg executable
+func GetFFmpegPath() (string, error) {
+	ffmpegDir, err := GetFFmpegDir()
+	if err != nil {
+		return "", err
+	}
+
+	ffmpegName := "ffmpeg"
+	if runtime.GOOS == "windows" {
+		ffmpegName = "ffmpeg.exe"
+	}
+
+	return filepath.Join(ffmpegDir, ffmpegName), nil
+}
+
+// IsFFmpegInstalled checks if ffmpeg is installed in the app directory
+func IsFFmpegInstalled() (bool, error) {
+	ffmpegPath, err := GetFFmpegPath()
+	if err != nil {
+		return false, err
+	}
+
+	_, err = os.Stat(ffmpegPath)
+	if os.IsNotExist(err) {
+		return false, nil
+	}
+	if err != nil {
+		return false, err
+	}
+
+	// Verify it's executable
+	cmd := exec.Command(ffmpegPath, "-version")
+	err = cmd.Run()
+	return err == nil, nil
+}
+
+// DownloadFFmpeg downloads and extracts ffmpeg to the app directory
+func DownloadFFmpeg(progressCallback func(int)) error {
+	ffmpegDir, err := GetFFmpegDir()
+	if err != nil {
+		return err
+	}
+
+	// Create directory if it doesn't exist
+	if err := os.MkdirAll(ffmpegDir, 0755); err != nil {
+		return fmt.Errorf("failed to create ffmpeg directory: %w", err)
+	}
+
+	// Get the appropriate URL for the current OS
+	var encodedURL string
+	switch runtime.GOOS {
+	case "windows":
+		encodedURL = ffmpegWindowsURL
+	case "linux":
+		encodedURL = ffmpegLinuxURL
+	case "darwin":
+		encodedURL = ffmpegMacOSURL
+	default:
+		return fmt.Errorf("unsupported operating system: %s", runtime.GOOS)
+	}
+
+	// Decode URL
+	url, err := decodeBase64(encodedURL)
+	if err != nil {
+		return fmt.Errorf("failed to decode ffmpeg URL: %w", err)
+	}
+
+	fmt.Printf("[FFmpeg] Downloading from: %s\n", url)
+
+	// Create temporary file for download
+	tmpFile, err := os.CreateTemp("", "ffmpeg-*")
+	if err != nil {
+		return fmt.Errorf("failed to create temp file: %w", err)
+	}
+	defer os.Remove(tmpFile.Name())
+	defer tmpFile.Close()
+
+	// Download the file
+	resp, err := http.Get(url)
+	if err != nil {
+		return fmt.Errorf("failed to download ffmpeg: %w", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		return fmt.Errorf("failed to download ffmpeg: HTTP %d", resp.StatusCode)
+	}
+
+	totalSize := resp.ContentLength
+	var downloaded int64
+
+	// Create a progress reader
+	buf := make([]byte, 32*1024)
+	for {
+		n, err := resp.Body.Read(buf)
+		if n > 0 {
+			_, writeErr := tmpFile.Write(buf[:n])
+			if writeErr != nil {
+				return fmt.Errorf("failed to write to temp file: %w", writeErr)
+			}
+			downloaded += int64(n)
+			if totalSize > 0 && progressCallback != nil {
+				progress := int(float64(downloaded) / float64(totalSize) * 100)
+				progressCallback(progress)
+			}
+		}
+		if err == io.EOF {
+			break
+		}
+		if err != nil {
+			return fmt.Errorf("failed to read response: %w", err)
+		}
+	}
+
+	tmpFile.Close()
+
+	fmt.Printf("[FFmpeg] Download complete, extracting...\n")
+
+	// Extract the archive
+	switch runtime.GOOS {
+	case "windows", "darwin":
+		return extractZip(tmpFile.Name(), ffmpegDir)
+	case "linux":
+		return extractTarXz(tmpFile.Name(), ffmpegDir)
+	default:
+		return fmt.Errorf("unsupported operating system: %s", runtime.GOOS)
+	}
+}
+
+// extractZip extracts ffmpeg from a zip archive
+func extractZip(zipPath, destDir string) error {
+	r, err := zip.OpenReader(zipPath)
+	if err != nil {
+		return fmt.Errorf("failed to open zip: %w", err)
+	}
+	defer r.Close()
+
+	ffmpegName := "ffmpeg"
+	if runtime.GOOS == "windows" {
+		ffmpegName = "ffmpeg.exe"
+	}
+
+	destPath := filepath.Join(destDir, ffmpegName)
+
+	for _, f := range r.File {
+		// Look for ffmpeg executable in any subdirectory
+		baseName := filepath.Base(f.Name)
+		if baseName == ffmpegName && !f.FileInfo().IsDir() {
+			fmt.Printf("[FFmpeg] Found: %s\n", f.Name)
+
+			rc, err := f.Open()
+			if err != nil {
+				return fmt.Errorf("failed to open file in zip: %w", err)
+			}
+			defer rc.Close()
+
+			outFile, err := os.OpenFile(destPath, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0755)
+			if err != nil {
+				return fmt.Errorf("failed to create output file: %w", err)
+			}
+			defer outFile.Close()
+
+			_, err = io.Copy(outFile, rc)
+			if err != nil {
+				return fmt.Errorf("failed to extract file: %w", err)
+			}
+
+			fmt.Printf("[FFmpeg] Extracted to: %s\n", destPath)
+			return nil
+		}
+	}
+
+	return fmt.Errorf("ffmpeg executable not found in archive")
+}
+
+// extractTarXz extracts ffmpeg from a tar.xz archive
+func extractTarXz(tarXzPath, destDir string) error {
+	file, err := os.Open(tarXzPath)
+	if err != nil {
+		return fmt.Errorf("failed to open tar.xz: %w", err)
+	}
+	defer file.Close()
+
+	xzReader, err := xz.NewReader(file)
+	if err != nil {
+		return fmt.Errorf("failed to create xz reader: %w", err)
+	}
+
+	tarReader := tar.NewReader(xzReader)
+
+	ffmpegName := "ffmpeg"
+	destPath := filepath.Join(destDir, ffmpegName)
+
+	for {
+		header, err := tarReader.Next()
+		if err == io.EOF {
+			break
+		}
+		if err != nil {
+			return fmt.Errorf("failed to read tar: %w", err)
+		}
+
+		baseName := filepath.Base(header.Name)
+		if baseName == ffmpegName && header.Typeflag == tar.TypeReg {
+			fmt.Printf("[FFmpeg] Found: %s\n", header.Name)
+
+			outFile, err := os.OpenFile(destPath, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0755)
+			if err != nil {
+				return fmt.Errorf("failed to create output file: %w", err)
+			}
+			defer outFile.Close()
+
+			_, err = io.Copy(outFile, tarReader)
+			if err != nil {
+				return fmt.Errorf("failed to extract file: %w", err)
+			}
+
+			fmt.Printf("[FFmpeg] Extracted to: %s\n", destPath)
+			return nil
+		}
+	}
+
+	return fmt.Errorf("ffmpeg executable not found in archive")
+}
+
+// ConvertAudioRequest represents a request to convert audio files
+type ConvertAudioRequest struct {
+	InputFiles   []string `json:"input_files"`
+	OutputFormat string   `json:"output_format"` // mp3, m4a
+	Bitrate      string   `json:"bitrate"`       // e.g., "320k", "256k", "192k", "128k"
+}
+
+// ConvertAudioResult represents the result of a single file conversion
+type ConvertAudioResult struct {
+	InputFile  string `json:"input_file"`
+	OutputFile string `json:"output_file"`
+	Success    bool   `json:"success"`
+	Error      string `json:"error,omitempty"`
+}
+
+// ConvertAudio converts audio files using ffmpeg while preserving metadata
+func ConvertAudio(req ConvertAudioRequest) ([]ConvertAudioResult, error) {
+	ffmpegPath, err := GetFFmpegPath()
+	if err != nil {
+		return nil, fmt.Errorf("failed to get ffmpeg path: %w", err)
+	}
+
+	installed, err := IsFFmpegInstalled()
+	if err != nil || !installed {
+		return nil, fmt.Errorf("ffmpeg is not installed")
+	}
+
+	results := make([]ConvertAudioResult, len(req.InputFiles))
+	var wg sync.WaitGroup
+	var mu sync.Mutex
+
+	// Convert files in parallel
+	for i, inputFile := range req.InputFiles {
+		wg.Add(1)
+		go func(idx int, inputFile string) {
+			defer wg.Done()
+
+			result := ConvertAudioResult{
+				InputFile: inputFile,
+			}
+
+			// Get input file info
+			inputExt := strings.ToLower(filepath.Ext(inputFile))
+			baseName := strings.TrimSuffix(filepath.Base(inputFile), inputExt)
+			inputDir := filepath.Dir(inputFile)
+
+			// Determine output directory: same as input file location + subfolder (MP3 or M4A)
+			outputFormatUpper := strings.ToUpper(req.OutputFormat)
+			outputDir := filepath.Join(inputDir, outputFormatUpper)
+
+			// Create output directory if it doesn't exist
+			if err := os.MkdirAll(outputDir, 0755); err != nil {
+				result.Error = fmt.Sprintf("failed to create output directory: %v", err)
+				result.Success = false
+				mu.Lock()
+				results[idx] = result
+				mu.Unlock()
+				return
+			}
+
+			// Determine output path
+			outputExt := "." + strings.ToLower(req.OutputFormat)
+			outputFile := filepath.Join(outputDir, baseName+outputExt)
+
+			// Skip if same format
+			if inputExt == outputExt {
+				result.Error = "Input and output formats are the same"
+				result.Success = false
+				mu.Lock()
+				results[idx] = result
+				mu.Unlock()
+				return
+			}
+
+			result.OutputFile = outputFile
+
+			// Extract cover art and lyrics from input file before conversion
+			var coverArtPath string
+			var lyrics string
+			
+			coverArtPath, _ = ExtractCoverArt(inputFile)
+			lyrics, _ = ExtractLyrics(inputFile)
+
+			// Build ffmpeg command
+			args := []string{
+				"-i", inputFile,
+				"-y", // Overwrite output
+			}
+
+			// Add codec and bitrate based on output format
+			switch req.OutputFormat {
+			case "mp3":
+				args = append(args,
+					"-codec:a", "libmp3lame",
+					"-b:a", req.Bitrate,
+					"-map", "0:a", // Map audio stream
+					"-map_metadata", "0", // Copy all metadata
+					"-id3v2_version", "3", // Use ID3v2.3 for better compatibility
+				)
+				// Map video stream if exists (for cover art)
+				args = append(args, "-map", "0:v?", "-c:v", "copy")
+			case "m4a":
+				args = append(args,
+					"-codec:a", "aac",
+					"-b:a", req.Bitrate,
+					"-map", "0:a", // Map audio stream
+					"-map_metadata", "0", // Copy all metadata
+				)
+				// Map video stream for cover art in M4A
+				args = append(args, "-map", "0:v?", "-c:v", "copy", "-disposition:v:0", "attached_pic")
+			}
+
+			args = append(args, outputFile)
+
+			fmt.Printf("[FFmpeg] Converting: %s -> %s\n", inputFile, outputFile)
+
+			cmd := exec.Command(ffmpegPath, args...)
+			output, err := cmd.CombinedOutput()
+			if err != nil {
+				result.Error = fmt.Sprintf("conversion failed: %s - %s", err.Error(), string(output))
+				result.Success = false
+				mu.Lock()
+				results[idx] = result
+				mu.Unlock()
+				// Clean up temp cover art file if exists
+				if coverArtPath != "" {
+					os.Remove(coverArtPath)
+				}
+				return
+			}
+
+			// Embed cover art and lyrics after conversion if they were extracted
+			if coverArtPath != "" {
+				if err := EmbedCoverArtOnly(outputFile, coverArtPath); err != nil {
+					fmt.Printf("[FFmpeg] Warning: Failed to embed cover art: %v\n", err)
+				} else {
+					fmt.Printf("[FFmpeg] Cover art embedded successfully\n")
+				}
+				os.Remove(coverArtPath) // Clean up temp file
+			}
+
+			if lyrics != "" {
+				if err := EmbedLyricsOnlyUniversal(outputFile, lyrics); err != nil {
+					fmt.Printf("[FFmpeg] Warning: Failed to embed lyrics: %v\n", err)
+				} else {
+					fmt.Printf("[FFmpeg] Lyrics embedded successfully\n")
+				}
+			}
+
+			result.Success = true
+			fmt.Printf("[FFmpeg] Successfully converted: %s\n", outputFile)
+
+			mu.Lock()
+			results[idx] = result
+			mu.Unlock()
+		}(i, inputFile)
+	}
+
+	wg.Wait()
+	return results, nil
+}
+
+// GetAudioInfo returns information about an audio file
+type AudioFileInfo struct {
+	Path     string `json:"path"`
+	Filename string `json:"filename"`
+	Format   string `json:"format"`
+	Size     int64  `json:"size"`
+}
+
+// GetAudioFileInfo gets information about an audio file
+func GetAudioFileInfo(filePath string) (*AudioFileInfo, error) {
+	info, err := os.Stat(filePath)
+	if err != nil {
+		return nil, err
+	}
+
+	ext := strings.ToLower(strings.TrimPrefix(filepath.Ext(filePath), "."))
+	return &AudioFileInfo{
+		Path:     filePath,
+		Filename: filepath.Base(filePath),
+		Format:   ext,
+		Size:     info.Size(),
+	}, nil
+}
+
+// InstallFFmpegFromFile installs ffmpeg from a local file path
+func InstallFFmpegFromFile(filePath string) error {
+	// Check if file exists
+	info, err := os.Stat(filePath)
+	if err != nil {
+		return fmt.Errorf("file does not exist: %w", err)
+	}
+
+	// Check if it's a regular file (not a directory)
+	if info.IsDir() {
+		return fmt.Errorf("path is a directory, not a file")
+	}
+
+	// Verify it's likely an ffmpeg executable by checking the filename
+	fileName := strings.ToLower(filepath.Base(filePath))
+	expectedName := "ffmpeg"
+	if runtime.GOOS == "windows" {
+		expectedName = "ffmpeg.exe"
+	}
+
+	if fileName != expectedName && !strings.Contains(fileName, "ffmpeg") {
+		return fmt.Errorf("file does not appear to be an ffmpeg executable (expected name containing 'ffmpeg')")
+	}
+
+	// Get destination path
+	ffmpegPath, err := GetFFmpegPath()
+	if err != nil {
+		return fmt.Errorf("failed to get ffmpeg path: %w", err)
+	}
+
+	ffmpegDir := filepath.Dir(ffmpegPath)
+	
+	// Create directory if it doesn't exist
+	if err := os.MkdirAll(ffmpegDir, 0755); err != nil {
+		return fmt.Errorf("failed to create ffmpeg directory: %w", err)
+	}
+
+	// Copy file to destination
+	sourceFile, err := os.Open(filePath)
+	if err != nil {
+		return fmt.Errorf("failed to open source file: %w", err)
+	}
+
+	destFile, err := os.OpenFile(ffmpegPath, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0755)
+	if err != nil {
+		sourceFile.Close()
+		return fmt.Errorf("failed to create destination file: %w", err)
+	}
+
+	_, err = io.Copy(destFile, sourceFile)
+	sourceFile.Close()
+	if err != nil {
+		destFile.Close()
+		return fmt.Errorf("failed to copy file: %w", err)
+	}
+	
+	// Ensure all data is written to disk
+	if err := destFile.Sync(); err != nil {
+		destFile.Close()
+		return fmt.Errorf("failed to sync file: %w", err)
+	}
+	destFile.Close()
+
+	// On Windows, file may still be locked by antivirus or system
+	// Wait a bit and retry verification
+	maxRetries := 3
+	retryDelay := 500 * time.Millisecond
+	
+	var verifyErr error
+	for i := 0; i < maxRetries; i++ {
+		if i > 0 {
+			time.Sleep(retryDelay)
+		}
+		
+		cmd := exec.Command(ffmpegPath, "-version")
+		verifyErr = cmd.Run()
+		if verifyErr == nil {
+			break
+		}
+	}
+	
+	if verifyErr != nil {
+		return fmt.Errorf("file copied but ffmpeg verification failed after %d attempts: %w", maxRetries, verifyErr)
+	}
+
+	fmt.Printf("[FFmpeg] Successfully installed from: %s\n", filePath)
+	return nil
+}
+

backend/file_dialog.go

@@ -0,0 +1,52 @@
+package backend
+
+import (
+	"context"
+
+	"github.com/wailsapp/wails/v2/pkg/runtime"
+)
+
+// SelectMultipleFiles opens a file dialog to select multiple audio files
+func SelectMultipleFiles(ctx context.Context) ([]string, error) {
+	files, err := runtime.OpenMultipleFilesDialog(ctx, runtime.OpenDialogOptions{
+		Title: "Select Audio Files",
+		Filters: []runtime.FileFilter{
+			{
+				DisplayName: "Audio Files (*.mp3, *.m4a, *.flac)",
+				Pattern:     "*.mp3;*.m4a;*.flac",
+			},
+			{
+				DisplayName: "MP3 Files (*.mp3)",
+				Pattern:     "*.mp3",
+			},
+			{
+				DisplayName: "M4A Files (*.m4a)",
+				Pattern:     "*.m4a",
+			},
+			{
+				DisplayName: "FLAC Files (*.flac)",
+				Pattern:     "*.flac",
+			},
+			{
+				DisplayName: "All Files (*.*)",
+				Pattern:     "*.*",
+			},
+		},
+	})
+	if err != nil {
+		return nil, err
+	}
+	return files, nil
+}
+
+// SelectOutputDirectory opens a directory dialog to select output folder
+func SelectOutputDirectory(ctx context.Context) (string, error) {
+	dir, err := runtime.OpenDirectoryDialog(ctx, runtime.OpenDialogOptions{
+		Title: "Select Output Directory",
+	})
+	if err != nil {
+		return "", err
+	}
+	return dir, nil
+}
+

backend/lyrics.go

@@ -74,10 +74,12 @@ func NewLyricsClient() *LyricsClient {
 	}
 }
 
-// FetchLyricsWithMetadata fetches lyrics using track name and artist (for LRCLIB fallback)
+// FetchLyricsWithMetadata fetches lyrics using track name and artist from LRCLIB
 func (c *LyricsClient) FetchLyricsWithMetadata(trackName, artistName string) (*LyricsResponse, error) {
 	// Try LRCLIB API
-	apiURL := fmt.Sprintf("https://lrclib.net/api/get?artist_name=%s&track_name=%s",
+	apiBase, _ := base64.StdEncoding.DecodeString("aHR0cHM6Ly9scmNsaWIubmV0L2FwaS9nZXQ/YXJ0aXN0X25hbWU9")
+	apiURL := fmt.Sprintf("%s%s&track_name=%s",
+		string(apiBase),
 		url.QueryEscape(artistName),
 		url.QueryEscape(trackName))
 
@@ -174,7 +176,8 @@ func lrcTimestampToMs(timestamp string) int64 {
 // FetchLyricsFromLRCLibSearch fetches lyrics using LRCLIB search API
 func (c *LyricsClient) FetchLyricsFromLRCLibSearch(trackName, artistName string) (*LyricsResponse, error) {
 	query := fmt.Sprintf("%s %s", artistName, trackName)
-	apiURL := fmt.Sprintf("https://lrclib.net/api/search?q=%s", url.QueryEscape(query))
+	apiBase, _ := base64.StdEncoding.DecodeString("aHR0cHM6Ly9scmNsaWIubmV0L2FwaS9zZWFyY2g/cT0=")
+	apiURL := fmt.Sprintf("%s%s", string(apiBase), url.QueryEscape(query))
 
 	resp, err := c.httpClient.Get(apiURL)
 	if err != nil {
@@ -232,35 +235,26 @@ func simplifyTrackName(name string) string {
 	return name
 }
 
-// FetchLyricsAllSources tries all sources to get lyrics
+// FetchLyricsAllSources tries all LRCLIB sources to get lyrics
 func (c *LyricsClient) FetchLyricsAllSources(spotifyID, trackName, artistName string) (*LyricsResponse, string, error) {
-	// 1. Try Spotify API
-	if spotifyID != "" {
-		resp, err := c.FetchLyrics(spotifyID)
-		if err == nil && resp != nil && len(resp.Lines) > 0 {
-			return resp, "Spotify", nil
-		}
-		fmt.Printf("   ↳ Spotify API: %v\n", err)
-	}
-
-	// 2. Try LRCLIB exact match
+	// 1. Try LRCLIB exact match
 	resp, err := c.FetchLyricsWithMetadata(trackName, artistName)
 	if err == nil && resp != nil && !resp.Error && len(resp.Lines) > 0 {
 		return resp, "LRCLIB", nil
 	}
-	fmt.Printf("   ↳ LRCLIB exact: %v\n", err)
+	fmt.Printf("   LRCLIB exact: %v\n", err)
 
-	// 3. Try LRCLIB search
+	// 2. Try LRCLIB search
 	resp, err = c.FetchLyricsFromLRCLibSearch(trackName, artistName)
 	if err == nil && resp != nil && !resp.Error && len(resp.Lines) > 0 {
 		return resp, "LRCLIB Search", nil
 	}
-	fmt.Printf("   ↳ LRCLIB search: %v\n", err)
+	fmt.Printf("   LRCLIB search: %v\n", err)
 
-	// 4. Try with simplified track name (remove parentheses, subtitles)
+	// 3. Try with simplified track name (remove parentheses, subtitles)
 	simplifiedTrack := simplifyTrackName(trackName)
 	if simplifiedTrack != trackName {
-		fmt.Printf("   ↳ Trying simplified name: %s\n", simplifiedTrack)
+		fmt.Printf("   Trying simplified name: %s\n", simplifiedTrack)
 		
 		resp, err = c.FetchLyricsWithMetadata(simplifiedTrack, artistName)
 		if err == nil && resp != nil && !resp.Error && len(resp.Lines) > 0 {
@@ -276,34 +270,6 @@ func (c *LyricsClient) FetchLyricsAllSources(spotifyID, trackName, artistName st
 	return nil, "", fmt.Errorf("lyrics not found in any source")
 }
 
-// FetchLyrics fetches lyrics from the Spotify Lyrics API with LRCLIB fallback
-func (c *LyricsClient) FetchLyrics(spotifyID string) (*LyricsResponse, error) {
-	// Decode base64 API URL
-	apiBase, _ := base64.StdEncoding.DecodeString("aHR0cHM6Ly9zcG90aWZ5LWx5cmljcy1hcGktcGkudmVyY2VsLmFwcC8/dHJhY2tpZD0=")
-	apiURL := fmt.Sprintf("%s%s", string(apiBase), spotifyID)
-
-	resp, err := c.httpClient.Get(apiURL)
-	if err != nil {
-		return nil, fmt.Errorf("failed to fetch lyrics: %v", err)
-	}
-	defer resp.Body.Close()
-
-	body, err := io.ReadAll(resp.Body)
-	if err != nil {
-		return nil, fmt.Errorf("failed to read response: %v", err)
-	}
-
-	var lyricsResp LyricsResponse
-	if err := json.Unmarshal(body, &lyricsResp); err != nil {
-		return nil, fmt.Errorf("failed to parse lyrics response: %v", err)
-	}
-
-	if lyricsResp.Error {
-		return nil, fmt.Errorf("lyrics not found for this track")
-	}
-
-	return &lyricsResp, nil
-}
 
 // ConvertToLRC converts lyrics response to LRC format
 func (c *LyricsClient) ConvertToLRC(lyrics *LyricsResponse, trackName, artistName string) string {
@@ -426,8 +392,8 @@ func (c *LyricsClient) DownloadLyrics(req LyricsDownloadRequest) (*LyricsDownloa
 		}, nil
 	}
 
-	// Fetch lyrics
-	lyrics, err := c.FetchLyrics(req.SpotifyID)
+	// Fetch lyrics from LRCLIB
+	lyrics, _, err := c.FetchLyricsAllSources(req.SpotifyID, req.TrackName, req.ArtistName)
 	if err != nil {
 		return &LyricsDownloadResponse{
 			Success: false,

backend/metadata.go

@@ -3,9 +3,11 @@ package backend
 import (
 	"fmt"
 	"os"
+	pathfilepath "path/filepath"
 	"strconv"
 	"strings"
 
+	id3v2 "github.com/bogem/id3v2/v2"
 	"github.com/go-flac/flacpicture"
 	"github.com/go-flac/flacvorbis"
 	"github.com/go-flac/go-flac"
@@ -247,3 +249,262 @@ func CheckISRCExists(outputDir string, targetISRC string) (string, bool) {
 
 	return "", false
 }
+
+// ExtractCoverArt extracts cover art from an audio file and saves it to a temporary file
+func ExtractCoverArt(filePath string) (string, error) {
+	ext := strings.ToLower(pathfilepath.Ext(filePath))
+	
+	switch ext {
+	case ".mp3":
+		return extractCoverFromMp3(filePath)
+	case ".m4a", ".flac":
+		return extractCoverFromM4AOrFlac(filePath)
+	default:
+		return "", fmt.Errorf("unsupported file format: %s", ext)
+	}
+}
+
+// extractCoverFromMp3 extracts cover art from MP3 file
+func extractCoverFromMp3(filePath string) (string, error) {
+	tag, err := id3v2.Open(filePath, id3v2.Options{Parse: true})
+	if err != nil {
+		return "", fmt.Errorf("failed to open MP3 file: %w", err)
+	}
+	defer tag.Close()
+
+	pictures := tag.GetFrames(tag.CommonID("Attached picture"))
+	if len(pictures) == 0 {
+		return "", fmt.Errorf("no cover art found")
+	}
+
+	pic, ok := pictures[0].(id3v2.PictureFrame)
+	if !ok {
+		return "", fmt.Errorf("invalid picture frame")
+	}
+
+	// Create temporary file
+	tmpFile, err := os.CreateTemp("", "cover-*.jpg")
+	if err != nil {
+		return "", fmt.Errorf("failed to create temp file: %w", err)
+	}
+	defer tmpFile.Close()
+
+	if _, err := tmpFile.Write(pic.Picture); err != nil {
+		os.Remove(tmpFile.Name())
+		return "", fmt.Errorf("failed to write cover art: %w", err)
+	}
+
+	return tmpFile.Name(), nil
+}
+
+// extractCoverFromM4AOrFlac extracts cover art from M4A or FLAC file
+func extractCoverFromM4AOrFlac(filePath string) (string, error) {
+	ext := strings.ToLower(pathfilepath.Ext(filePath))
+	
+	if ext == ".flac" {
+		f, err := flac.ParseFile(filePath)
+		if err != nil {
+			return "", fmt.Errorf("failed to parse FLAC file: %w", err)
+		}
+
+		for _, block := range f.Meta {
+			if block.Type == flac.Picture {
+				pic, err := flacpicture.ParseFromMetaDataBlock(*block)
+				if err != nil {
+					continue
+				}
+
+				// Create temporary file
+				tmpFile, err := os.CreateTemp("", "cover-*.jpg")
+				if err != nil {
+					return "", fmt.Errorf("failed to create temp file: %w", err)
+				}
+				defer tmpFile.Close()
+
+				if _, err := tmpFile.Write(pic.ImageData); err != nil {
+					os.Remove(tmpFile.Name())
+					return "", fmt.Errorf("failed to write cover art: %w", err)
+				}
+
+				return tmpFile.Name(), nil
+			}
+		}
+		return "", fmt.Errorf("no cover art found")
+	}
+
+	// For M4A, try to extract using ffmpeg or return empty
+	// M4A cover art should be preserved by ffmpeg during conversion
+	return "", nil
+}
+
+// ExtractLyrics extracts lyrics from an audio file
+func ExtractLyrics(filePath string) (string, error) {
+	ext := strings.ToLower(pathfilepath.Ext(filePath))
+	
+	switch ext {
+	case ".mp3":
+		return extractLyricsFromMp3(filePath)
+	case ".flac":
+		return extractLyricsFromFlac(filePath)
+	case ".m4a":
+		// M4A lyrics extraction would need different approach
+		return "", nil
+	default:
+		return "", fmt.Errorf("unsupported file format: %s", ext)
+	}
+}
+
+// extractLyricsFromMp3 extracts lyrics from MP3 file
+func extractLyricsFromMp3(filePath string) (string, error) {
+	tag, err := id3v2.Open(filePath, id3v2.Options{Parse: true})
+	if err != nil {
+		return "", fmt.Errorf("failed to open MP3 file: %w", err)
+	}
+	defer tag.Close()
+
+	usltFrames := tag.GetFrames(tag.CommonID("Unsynchronised lyrics/text transcription"))
+	if len(usltFrames) == 0 {
+		return "", nil
+	}
+
+	uslt, ok := usltFrames[0].(id3v2.UnsynchronisedLyricsFrame)
+	if !ok {
+		return "", nil
+	}
+
+	return uslt.Lyrics, nil
+}
+
+// extractLyricsFromFlac extracts lyrics from FLAC file
+func extractLyricsFromFlac(filePath string) (string, error) {
+	f, err := flac.ParseFile(filePath)
+	if err != nil {
+		return "", fmt.Errorf("failed to parse FLAC file: %w", err)
+	}
+
+	for _, block := range f.Meta {
+		if block.Type == flac.VorbisComment {
+			cmt, err := flacvorbis.ParseFromMetaDataBlock(*block)
+			if err != nil {
+				continue
+			}
+
+			// Search through comments for lyrics
+			for _, comment := range cmt.Comments {
+				parts := strings.SplitN(comment, "=", 2)
+				if len(parts) == 2 {
+					fieldName := strings.ToUpper(parts[0])
+					if fieldName == "LYRICS" || fieldName == "UNSYNCEDLYRICS" {
+						return parts[1], nil
+					}
+				}
+			}
+		}
+	}
+
+	return "", nil
+}
+
+// EmbedCoverArtOnly embeds cover art into an audio file
+func EmbedCoverArtOnly(filePath string, coverPath string) error {
+	if coverPath == "" || !fileExists(coverPath) {
+		return nil
+	}
+
+	ext := strings.ToLower(pathfilepath.Ext(filePath))
+	
+	switch ext {
+	case ".mp3":
+		return embedCoverToMp3(filePath, coverPath)
+	case ".m4a":
+		// M4A cover art should be handled by ffmpeg during conversion
+		// If not, we can try to embed using atomicparsley or similar tool
+		// For now, return nil as ffmpeg should handle it
+		return nil
+	default:
+		return fmt.Errorf("unsupported file format: %s", ext)
+	}
+}
+
+// embedCoverToMp3 embeds cover art into MP3 file
+func embedCoverToMp3(filePath string, coverPath string) error {
+	tag, err := id3v2.Open(filePath, id3v2.Options{Parse: true})
+	if err != nil {
+		return fmt.Errorf("failed to open MP3 file: %w", err)
+	}
+	defer tag.Close()
+
+	// Remove existing cover art
+	tag.DeleteFrames(tag.CommonID("Attached picture"))
+
+	// Read cover art
+	artwork, err := os.ReadFile(coverPath)
+	if err != nil {
+		return fmt.Errorf("failed to read cover art: %w", err)
+	}
+
+	// Add new cover art
+	pic := id3v2.PictureFrame{
+		Encoding:    id3v2.EncodingUTF8,
+		MimeType:    "image/jpeg",
+		PictureType: id3v2.PTFrontCover,
+		Description: "Front cover",
+		Picture:     artwork,
+	}
+	tag.AddAttachedPicture(pic)
+
+	if err := tag.Save(); err != nil {
+		return fmt.Errorf("failed to save MP3 tags: %w", err)
+	}
+
+	return nil
+}
+
+// EmbedLyricsOnlyMP3 adds lyrics to an MP3 file using ID3v2 USLT frame
+func EmbedLyricsOnlyMP3(filepath string, lyrics string) error {
+	if lyrics == "" {
+		return nil
+	}
+	
+	tag, err := id3v2.Open(filepath, id3v2.Options{Parse: true})
+	if err != nil {
+		return fmt.Errorf("failed to open MP3 file: %w", err)
+	}
+	defer tag.Close()
+
+	// Remove existing USLT frames
+	tag.DeleteFrames(tag.CommonID("Unsynchronised lyrics/text transcription"))
+
+	// Add new USLT frame with lyrics
+	// Use UTF-8 encoding for better compatibility with AIMP and other players
+	usltFrame := id3v2.UnsynchronisedLyricsFrame{
+		Encoding:          id3v2.EncodingUTF8, // Use UTF-8 instead of default encoding
+		Language:          "eng",
+		ContentDescriptor: "", // Empty descriptor for better compatibility
+		Lyrics:            lyrics,
+	}
+	tag.AddUnsynchronisedLyricsFrame(usltFrame)
+
+	if err := tag.Save(); err != nil {
+		return fmt.Errorf("failed to save MP3 tags: %w", err)
+	}
+
+	return nil
+}
+
+// EmbedLyricsOnlyUniversal embeds lyrics to MP3 or FLAC file
+func EmbedLyricsOnlyUniversal(filepath string, lyrics string) error {
+	if lyrics == "" {
+		return nil
+	}
+	
+	ext := strings.ToLower(pathfilepath.Ext(filepath))
+	switch ext {
+	case ".mp3":
+		return EmbedLyricsOnlyMP3(filepath, lyrics)
+	case ".flac":
+		return EmbedLyricsOnly(filepath, lyrics)
+	default:
+		return fmt.Errorf("unsupported file format for lyrics embedding: %s", ext)
+	}
+}

backend/qobuz.go

@@ -93,8 +93,23 @@ func (q *QobuzDownloader) SearchByISRC(isrc string) (*QobuzTrack, error) {
 	}
 
 	var searchResp QobuzSearchResponse
-	if err := json.NewDecoder(resp.Body).Decode(&searchResp); err != nil {
-		return nil, fmt.Errorf("failed to decode response: %w", err)
+	// Read body first to handle encoding issues
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return nil, fmt.Errorf("failed to read response body: %w", err)
+	}
+
+	if len(body) == 0 {
+		return nil, fmt.Errorf("API returned empty response")
+	}
+
+	if err := json.Unmarshal(body, &searchResp); err != nil {
+		// Truncate body for error message (max 200 chars)
+		bodyStr := string(body)
+		if len(bodyStr) > 200 {
+			bodyStr = bodyStr[:200] + "..."
+		}
+		return nil, fmt.Errorf("failed to decode response: %w (response: %s)", err, bodyStr)
 	}
 
 	if len(searchResp.Tracks.Items) == 0 {
@@ -151,12 +166,25 @@ func (q *QobuzDownloader) GetDownloadURL(trackID int64, quality string) (string,
 		return "", fmt.Errorf("API returned status %d", resp.StatusCode)
 	}
 
-	body, _ := io.ReadAll(resp.Body)
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return "", fmt.Errorf("failed to read response body: %w", err)
+	}
+
+	if len(body) == 0 {
+		return "", fmt.Errorf("API returned empty response")
+	}
+
 	fmt.Printf("Fallback API response: %s\n", string(body))
 
 	var streamResp QobuzStreamResponse
 	if err := json.Unmarshal(body, &streamResp); err != nil {
-		return "", fmt.Errorf("failed to decode response: %w", err)
+		// Truncate body for error message (max 200 chars)
+		bodyStr := string(body)
+		if len(bodyStr) > 200 {
+			bodyStr = bodyStr[:200] + "..."
+		}
+		return "", fmt.Errorf("failed to decode response: %w (response: %s)", err, bodyStr)
 	}
 
 	if streamResp.URL == "" {

backend/songlink.go

@@ -4,6 +4,7 @@ import (
 	"encoding/base64"
 	"encoding/json"
 	"fmt"
+	"io"
 	"net/http"
 	"net/url"
 	"time"
@@ -126,8 +127,23 @@ func (s *SongLinkClient) GetAllURLsFromSpotify(spotifyTrackID string) (*SongLink
 			URL string `json:"url"`
 		} `json:"linksByPlatform"`
 	}
-	if err := json.NewDecoder(resp.Body).Decode(&songLinkResp); err != nil {
-		return nil, fmt.Errorf("failed to decode response: %w", err)
+	// Read body first to handle encoding issues
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return nil, fmt.Errorf("failed to read response body: %w", err)
+	}
+
+	if len(body) == 0 {
+		return nil, fmt.Errorf("API returned empty response")
+	}
+
+	if err := json.Unmarshal(body, &songLinkResp); err != nil {
+		// Truncate body for error message (max 200 chars)
+		bodyStr := string(body)
+		if len(bodyStr) > 200 {
+			bodyStr = bodyStr[:200] + "..."
+		}
+		return nil, fmt.Errorf("failed to decode response: %w (response: %s)", err, bodyStr)
 	}
 
 	urls := &SongLinkURLs{}
@@ -245,8 +261,23 @@ func (s *SongLinkClient) CheckTrackAvailability(spotifyTrackID string, isrc stri
 			URL string `json:"url"`
 		} `json:"linksByPlatform"`
 	}
-	if err := json.NewDecoder(resp.Body).Decode(&songLinkResp); err != nil {
-		return nil, fmt.Errorf("failed to decode response: %w", err)
+	// Read body first to handle encoding issues
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return nil, fmt.Errorf("failed to read response body: %w", err)
+	}
+
+	if len(body) == 0 {
+		return nil, fmt.Errorf("API returned empty response")
+	}
+
+	if err := json.Unmarshal(body, &songLinkResp); err != nil {
+		// Truncate body for error message (max 200 chars)
+		bodyStr := string(body)
+		if len(bodyStr) > 200 {
+			bodyStr = bodyStr[:200] + "..."
+		}
+		return nil, fmt.Errorf("failed to decode response: %w (response: %s)", err, bodyStr)
 	}
 
 	availability := &TrackAvailability{

backend/tidal.go

@@ -571,8 +571,13 @@ func (t *TidalDownloader) GetDownloadURL(trackID int64, quality string) (string,
 	// Fallback to v1 format (array with OriginalTrackUrl)
 	var apiResponses []TidalAPIResponse
 	if err := json.Unmarshal(body, &apiResponses); err != nil {
-		fmt.Printf("✗ Failed to decode Tidal API response: %v\n", err)
-		return "", fmt.Errorf("failed to decode response: %w", err)
+		// Truncate body for error message (max 200 chars)
+		bodyStr := string(body)
+		if len(bodyStr) > 200 {
+			bodyStr = bodyStr[:200] + "..."
+		}
+		fmt.Printf("✗ Failed to decode Tidal API response: %v (response: %s)\n", err, bodyStr)
+		return "", fmt.Errorf("failed to decode response: %w (response: %s)", err, bodyStr)
 	}
 
 	if len(apiResponses) == 0 {