package backend

import (
	"encoding/base64"
	"encoding/json"
	"encoding/xml"
	"fmt"
	"io"
	"net/http"
	"net/url"
	"os"
	"os/exec"
	"path/filepath"
	"regexp"
	"strings"
	"time"
)

type TidalDownloader struct {
	client       *http.Client
	timeout      time.Duration
	maxRetries   int
	clientID     string
	clientSecret string
	apiURL       string
}

type TidalTrack struct {
	ID           int64  `json:"id"`
	Title        string `json:"title"`
	ISRC         string `json:"isrc"`
	AudioQuality string `json:"audioQuality"`
	TrackNumber  int    `json:"trackNumber"`
	VolumeNumber int    `json:"volumeNumber"`
	Duration     int    `json:"duration"`
	Copyright    string `json:"copyright"`
	Explicit     bool   `json:"explicit"`
	Album        struct {
		Title       string `json:"title"`
		Cover       string `json:"cover"`
		ReleaseDate string `json:"releaseDate"`
	} `json:"album"`
	Artists []struct {
		Name string `json:"name"`
	} `json:"artists"`
	Artist struct {
		Name string `json:"name"`
	} `json:"artist"`
	MediaMetadata struct {
		Tags []string `json:"tags"`
	} `json:"mediaMetadata"`
}

type TidalAPIResponse struct {
	OriginalTrackURL string `json:"OriginalTrackUrl"`
}

type TidalAPIResponseV2 struct {
	Version string `json:"version"`
	Data    struct {
		TrackID           int64  `json:"trackId"`
		AssetPresentation string `json:"assetPresentation"`
		AudioMode         string `json:"audioMode"`
		AudioQuality      string `json:"audioQuality"`
		ManifestMimeType  string `json:"manifestMimeType"`
		ManifestHash      string `json:"manifestHash"`
		Manifest          string `json:"manifest"`
		BitDepth          int    `json:"bitDepth"`
		SampleRate        int    `json:"sampleRate"`
	} `json:"data"`
}

type TidalAPIInfo struct {
	URL    string `json:"url"`
	Status string `json:"status"`
}

type TidalBTSManifest struct {
	MimeType       string   `json:"mimeType"`
	Codecs         string   `json:"codecs"`
	EncryptionType string   `json:"encryptionType"`
	URLs           []string `json:"urls"`
}

func NewTidalDownloader(apiURL string) *TidalDownloader {
	clientID, _ := base64.StdEncoding.DecodeString("NkJEU1JkcEs5aHFFQlRnVQ==")
	clientSecret, _ := base64.StdEncoding.DecodeString("eGV1UG1ZN25icFo5SUliTEFjUTkzc2hrYTFWTmhlVUFxTjZJY3N6alRHOD0=")

	if apiURL == "" {
		downloader := &TidalDownloader{
			client: &http.Client{
				Timeout: 5 * time.Second,
			},
			timeout:      5 * time.Second,
			maxRetries:   3,
			clientID:     string(clientID),
			clientSecret: string(clientSecret),
			apiURL:       "",
		}

		apis, err := downloader.GetAvailableAPIs()
		if err == nil && len(apis) > 0 {
			apiURL = apis[0]
		}
	}

	return &TidalDownloader{
		client: &http.Client{
			Timeout: 5 * time.Second,
		},
		timeout:      5 * time.Second,
		maxRetries:   3,
		clientID:     string(clientID),
		clientSecret: string(clientSecret),
		apiURL:       apiURL,
	}
}

func (t *TidalDownloader) GetAvailableAPIs() ([]string, error) {

	encodedAPIs := []string{
		"dm9nZWwucXFkbC5zaXRl",
		"bWF1cy5xcWRsLnNpdGU=",
		"aHVuZC5xcWRsLnNpdGU=",
		"a2F0emUucXFkbC5zaXRl",
		"d29sZi5xcWRsLnNpdGU=",
		"dGlkYWwua2lub3BsdXMub25saW5l",
		"dGlkYWwtYXBpLmJpbmltdW0ub3Jn",
		"dHJpdG9uLnNxdWlkLnd0Zg==",
	}

	var apis []string
	for _, encoded := range encodedAPIs {
		decoded, err := base64.StdEncoding.DecodeString(encoded)
		if err != nil {
			continue
		}
		apis = append(apis, "https://"+string(decoded))
	}

	return apis, nil
}

func (t *TidalDownloader) GetAccessToken() (string, error) {
	data := fmt.Sprintf("client_id=%s&grant_type=client_credentials", t.clientID)

	authURL, _ := base64.StdEncoding.DecodeString("aHR0cHM6Ly9hdXRoLnRpZGFsLmNvbS92MS9vYXV0aDIvdG9rZW4=")
	req, err := http.NewRequest("POST", string(authURL), strings.NewReader(data))
	if err != nil {
		return "", err
	}

	req.SetBasicAuth(t.clientID, t.clientSecret)
	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")

	resp, err := t.client.Do(req)
	if err != nil {
		return "", err
	}
	defer resp.Body.Close()

	if resp.StatusCode != 200 {
		return "", fmt.Errorf("failed to get access token: HTTP %d", resp.StatusCode)
	}

	var result struct {
		AccessToken string `json:"access_token"`
	}

	if err := json.NewDecoder(resp.Body).Decode(&result); err != nil {
		return "", err
	}

	return result.AccessToken, nil
}

func (t *TidalDownloader) GetTidalURLFromSpotify(spotifyTrackID string) (string, error) {

	spotifyBase, _ := base64.StdEncoding.DecodeString("aHR0cHM6Ly9vcGVuLnNwb3RpZnkuY29tL3RyYWNrLw==")
	spotifyURL := fmt.Sprintf("%s%s", string(spotifyBase), spotifyTrackID)

	apiBase, _ := base64.StdEncoding.DecodeString("aHR0cHM6Ly9hcGkuc29uZy5saW5rL3YxLWFscGhhLjEvbGlua3M/dXJsPQ==")
	apiURL := fmt.Sprintf("%s%s", string(apiBase), url.QueryEscape(spotifyURL))

	req, err := http.NewRequest("GET", apiURL, nil)
	if err != nil {
		return "", fmt.Errorf("failed to create request: %w", err)
	}

	fmt.Println("Getting Tidal URL...")

	resp, err := t.client.Do(req)
	if err != nil {
		return "", fmt.Errorf("failed to get Tidal URL: %w", err)
	}
	defer resp.Body.Close()

	if resp.StatusCode != 200 {
		return "", fmt.Errorf("API returned status %d", resp.StatusCode)
	}

	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)
	}

	tidalLink, ok := songLinkResp.LinksByPlatform["tidal"]
	if !ok || tidalLink.URL == "" {
		return "", fmt.Errorf("tidal link not found")
	}

	tidalURL := tidalLink.URL
	fmt.Printf("Found Tidal URL: %s\n", tidalURL)
	return tidalURL, nil
}

func (t *TidalDownloader) GetTrackIDFromURL(tidalURL string) (int64, error) {

	parts := strings.Split(tidalURL, "/track/")
	if len(parts) < 2 {
		return 0, fmt.Errorf("invalid tidal URL format")
	}

	trackIDStr := strings.Split(parts[1], "?")[0]
	trackIDStr = strings.TrimSpace(trackIDStr)

	var trackID int64
	_, err := fmt.Sscanf(trackIDStr, "%d", &trackID)
	if err != nil {
		return 0, fmt.Errorf("failed to parse track ID: %w", err)
	}

	return trackID, nil
}

func (t *TidalDownloader) GetTrackInfoByID(trackID int64) (*TidalTrack, error) {
	token, err := t.GetAccessToken()
	if err != nil {
		return nil, fmt.Errorf("failed to get access token: %w", err)
	}

	trackBase, _ := base64.StdEncoding.DecodeString("aHR0cHM6Ly9hcGkudGlkYWwuY29tL3YxL3RyYWNrcy8=")
	trackURL := fmt.Sprintf("%s%d?countryCode=US", string(trackBase), trackID)

	req, err := http.NewRequest("GET", trackURL, nil)
	if err != nil {
		return nil, err
	}

	req.Header.Set("Authorization", "Bearer "+token)

	resp, err := t.client.Do(req)
	if err != nil {
		return nil, err
	}
	defer resp.Body.Close()

	if resp.StatusCode != 200 {
		body, _ := io.ReadAll(resp.Body)
		return nil, fmt.Errorf("failed to get track info: HTTP %d - %s", resp.StatusCode, string(body))
	}

	var trackInfo TidalTrack
	if err := json.NewDecoder(resp.Body).Decode(&trackInfo); err != nil {
		return nil, err
	}

	fmt.Printf("Found: %s (%s)\n", trackInfo.Title, trackInfo.AudioQuality)
	return &trackInfo, nil
}

func (t *TidalDownloader) GetDownloadURL(trackID int64, quality string) (string, error) {
	fmt.Println("Fetching URL...")

	url := fmt.Sprintf("%s/track/?id=%d&quality=%s", t.apiURL, trackID, quality)
	fmt.Printf("Tidal API URL: %s\n", url)

	resp, err := t.client.Get(url)
	if err != nil {
		fmt.Printf("✗ Tidal API request failed: %v\n", err)
		return "", fmt.Errorf("failed to get download URL: %w", err)
	}
	defer resp.Body.Close()

	if resp.StatusCode != 200 {
		fmt.Printf("✗ Tidal API returned status code: %d\n", resp.StatusCode)
		return "", fmt.Errorf("API returned status code: %d", resp.StatusCode)
	}

	body, err := io.ReadAll(resp.Body)
	if err != nil {
		fmt.Printf("✗ Failed to read response body: %v\n", err)
		return "", fmt.Errorf("failed to read response: %w", err)
	}

	var v2Response TidalAPIResponseV2
	if err := json.Unmarshal(body, &v2Response); err == nil && v2Response.Data.Manifest != "" {
		fmt.Println("✓ Tidal manifest found (v2 API)")
		return "MANIFEST:" + v2Response.Data.Manifest, nil
	}

	var apiResponses []TidalAPIResponse
	if err := json.Unmarshal(body, &apiResponses); err != nil {

		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 {
		fmt.Println("✗ Tidal API returned empty response")
		return "", fmt.Errorf("no download URL in response")
	}

	for _, item := range apiResponses {
		if item.OriginalTrackURL != "" {
			fmt.Println("✓ Tidal download URL found")
			return item.OriginalTrackURL, nil
		}
	}

	fmt.Println("✗ No valid download URL in Tidal API response")
	return "", fmt.Errorf("download URL not found in response")
}

func (t *TidalDownloader) DownloadAlbumArt(albumID string) ([]byte, error) {
	albumID = strings.ReplaceAll(albumID, "-", "/")

	imageBase, _ := base64.StdEncoding.DecodeString("aHR0cHM6Ly9yZXNvdXJjZXMudGlkYWwuY29tL2ltYWdlcy8=")
	artURL := fmt.Sprintf("%s%s/1280x1280.jpg", string(imageBase), albumID)

	resp, err := t.client.Get(artURL)
	if err != nil {
		return nil, err
	}
	defer resp.Body.Close()

	if resp.StatusCode != 200 {
		return nil, fmt.Errorf("failed to download album art: HTTP %d", resp.StatusCode)
	}

	return io.ReadAll(resp.Body)
}

func (t *TidalDownloader) DownloadFile(url, filepath string) error {

	if strings.HasPrefix(url, "MANIFEST:") {
		return t.DownloadFromManifest(strings.TrimPrefix(url, "MANIFEST:"), filepath)
	}

	resp, err := t.client.Get(url)

	if err != nil {
		return fmt.Errorf("failed to download file: %w", err)
	}
	defer resp.Body.Close()

	if resp.StatusCode != 200 {
		return fmt.Errorf("download failed with status %d", resp.StatusCode)
	}

	out, err := os.Create(filepath)
	if err != nil {
		return fmt.Errorf("failed to create file: %w", err)
	}
	defer out.Close()

	pw := NewProgressWriter(out)
	_, err = io.Copy(pw, resp.Body)
	if err != nil {
		return fmt.Errorf("failed to write file: %w", err)
	}

	fmt.Printf("\rDownloaded: %.2f MB (Complete)\n", float64(pw.GetTotal())/(1024*1024))

	fmt.Println("Download complete")
	return nil
}

func (t *TidalDownloader) DownloadFromManifest(manifestB64, outputPath string) error {
	directURL, initURL, mediaURLs, err := parseManifest(manifestB64)
	if err != nil {
		return fmt.Errorf("failed to parse manifest: %w", err)
	}

	client := &http.Client{
		Timeout: 120 * time.Second,
	}

	if directURL != "" {
		fmt.Println("Downloading file...")

		resp, err := client.Get(directURL)
		if err != nil {
			return fmt.Errorf("failed to download file: %w", err)
		}
		defer resp.Body.Close()

		if resp.StatusCode != 200 {
			return fmt.Errorf("download failed with status %d", resp.StatusCode)
		}

		out, err := os.Create(outputPath)
		if err != nil {
			return fmt.Errorf("failed to create file: %w", err)
		}
		defer out.Close()

		pw := NewProgressWriter(out)
		_, err = io.Copy(pw, resp.Body)
		if err != nil {
			return fmt.Errorf("failed to write file: %w", err)
		}

		fmt.Printf("\rDownloaded: %.2f MB (Complete)\n", float64(pw.GetTotal())/(1024*1024))
		fmt.Println("Download complete")
		return nil
	}

	fmt.Printf("Downloading %d segments...\n", len(mediaURLs)+1)

	tempPath := outputPath + ".m4a.tmp"
	out, err := os.Create(tempPath)
	if err != nil {
		return fmt.Errorf("failed to create temp file: %w", err)
	}

	fmt.Print("Downloading init segment... ")
	resp, err := client.Get(initURL)
	if err != nil {
		out.Close()
		os.Remove(tempPath)
		return fmt.Errorf("failed to download init segment: %w", err)
	}
	if resp.StatusCode != 200 {
		resp.Body.Close()
		out.Close()
		os.Remove(tempPath)
		return fmt.Errorf("init segment download failed with status %d", resp.StatusCode)
	}
	_, err = io.Copy(out, resp.Body)
	resp.Body.Close()
	if err != nil {
		out.Close()
		os.Remove(tempPath)
		return fmt.Errorf("failed to write init segment: %w", err)
	}
	fmt.Println("OK")

	totalSegments := len(mediaURLs)
	var totalBytes int64
	lastTime := time.Now()
	var lastBytes int64
	for i, mediaURL := range mediaURLs {
		resp, err := client.Get(mediaURL)
		if err != nil {
			out.Close()
			os.Remove(tempPath)
			return fmt.Errorf("failed to download segment %d: %w", i+1, err)
		}
		if resp.StatusCode != 200 {
			resp.Body.Close()
			out.Close()
			os.Remove(tempPath)
			return fmt.Errorf("segment %d download failed with status %d", i+1, resp.StatusCode)
		}
		n, err := io.Copy(out, resp.Body)
		totalBytes += n
		resp.Body.Close()
		if err != nil {
			out.Close()
			os.Remove(tempPath)
			return fmt.Errorf("failed to write segment %d: %w", i+1, err)
		}

		mbDownloaded := float64(totalBytes) / (1024 * 1024)
		now := time.Now()
		timeDiff := now.Sub(lastTime).Seconds()
		var speedMBps float64
		if timeDiff > 0.1 {
			bytesDiff := float64(totalBytes - lastBytes)
			speedMBps = (bytesDiff / (1024 * 1024)) / timeDiff
			SetDownloadSpeed(speedMBps)
			lastTime = now
			lastBytes = totalBytes
		}
		SetDownloadProgress(mbDownloaded)

		fmt.Printf("\rDownloading: %.2f MB (%d/%d segments)", mbDownloaded, i+1, totalSegments)
	}

	out.Close()

	tempInfo, _ := os.Stat(tempPath)
	fmt.Printf("\rDownloaded: %.2f MB (Complete)          \n", float64(tempInfo.Size())/(1024*1024))

	fmt.Println("Converting to FLAC...")
	ffmpegPath, err := GetFFmpegPath()
	if err != nil {
		return fmt.Errorf("ffmpeg not found: %w", err)
	}

	if err := ValidateExecutable(ffmpegPath); err != nil {
		return fmt.Errorf("invalid ffmpeg executable: %w", err)
	}

	cmd := exec.Command(ffmpegPath, "-y", "-i", tempPath, "-vn", "-c:a", "flac", outputPath)
	setHideWindow(cmd)
	var stderr strings.Builder
	cmd.Stderr = &stderr
	if err := cmd.Run(); err != nil {

		m4aPath := strings.TrimSuffix(outputPath, ".flac") + ".m4a"
		os.Rename(tempPath, m4aPath)
		return fmt.Errorf("ffmpeg conversion failed (M4A saved as %s): %w - %s", m4aPath, err, stderr.String())
	}

	os.Remove(tempPath)
	fmt.Println("Download complete")

	return nil
}

func (t *TidalDownloader) DownloadByURL(tidalURL, outputDir, quality, filenameFormat string, includeTrackNumber bool, position int, spotifyTrackName, spotifyArtistName, spotifyAlbumName, spotifyAlbumArtist, spotifyReleaseDate string, useAlbumTrackNumber bool, spotifyCoverURL string, embedMaxQualityCover bool, spotifyTrackNumber, spotifyDiscNumber, spotifyTotalTracks int, spotifyTotalDiscs int, spotifyCopyright, spotifyPublisher, spotifyURL string) (string, error) {
	if outputDir != "." {
		if err := os.MkdirAll(outputDir, 0755); err != nil {
			return "", fmt.Errorf("directory error: %w", err)
		}
	}

	fmt.Printf("Using Tidal URL: %s\n", tidalURL)

	trackID, err := t.GetTrackIDFromURL(tidalURL)
	if err != nil {
		return "", err
	}

	trackInfo, err := t.GetTrackInfoByID(trackID)
	if err != nil {
		return "", err
	}

	if trackInfo.ID == 0 {
		return "", fmt.Errorf("no track ID found")
	}

	artistName := spotifyArtistName
	trackTitle := spotifyTrackName
	albumTitle := spotifyAlbumName

	artistNameForFile := sanitizeFilename(artistName)
	trackTitleForFile := sanitizeFilename(trackTitle)
	albumTitleForFile := sanitizeFilename(albumTitle)
	albumArtistForFile := sanitizeFilename(spotifyAlbumArtist)

	filename := buildTidalFilename(trackTitleForFile, artistNameForFile, albumTitleForFile, albumArtistForFile, spotifyReleaseDate, trackInfo.TrackNumber, spotifyDiscNumber, filenameFormat, includeTrackNumber, position, useAlbumTrackNumber)
	outputFilename := filepath.Join(outputDir, filename)

	if fileInfo, err := os.Stat(outputFilename); err == nil && fileInfo.Size() > 0 {
		fmt.Printf("File already exists: %s (%.2f MB)\n", outputFilename, float64(fileInfo.Size())/(1024*1024))
		return "EXISTS:" + outputFilename, nil
	}

	downloadURL, err := t.GetDownloadURL(trackInfo.ID, quality)
	if err != nil {
		return "", err
	}

	fmt.Printf("Downloading to: %s\n", outputFilename)
	if err := t.DownloadFile(downloadURL, outputFilename); err != nil {
		return "", err
	}

	fmt.Println("Adding metadata...")

	coverPath := ""

	if spotifyCoverURL != "" {
		coverPath = outputFilename + ".cover.jpg"
		coverClient := NewCoverClient()
		if err := coverClient.DownloadCoverToPath(spotifyCoverURL, coverPath, embedMaxQualityCover); err != nil {
			fmt.Printf("Warning: Failed to download Spotify cover: %v\n", err)
			coverPath = ""
		} else {
			defer os.Remove(coverPath)
			fmt.Println("Spotify cover downloaded")
		}
	}

	trackNumberToEmbed := spotifyTrackNumber
	if trackNumberToEmbed == 0 {
		trackNumberToEmbed = 1
	}

	metadata := Metadata{
		Title:       trackTitle,
		Artist:      artistName,
		Album:       albumTitle,
		AlbumArtist: spotifyAlbumArtist,
		Date:        spotifyReleaseDate,
		TrackNumber: trackNumberToEmbed,
		TotalTracks: spotifyTotalTracks,
		DiscNumber:  spotifyDiscNumber,
		TotalDiscs:  spotifyTotalDiscs,
		URL:         spotifyURL,
		Copyright:   spotifyCopyright,
		Publisher:   spotifyPublisher,
		Description: "https://github.com/afkarxyz/SpotiFLAC",
	}

	if err := EmbedMetadata(outputFilename, metadata, coverPath); err != nil {
		fmt.Printf("Tagging failed: %v\n", err)
	} else {
		fmt.Println("Metadata saved")
	}

	fmt.Println("Done")
	fmt.Println("✓ Downloaded successfully from Tidal")
	return outputFilename, nil
}

func (t *TidalDownloader) DownloadByURLWithFallback(tidalURL, outputDir, quality, filenameFormat string, includeTrackNumber bool, position int, spotifyTrackName, spotifyArtistName, spotifyAlbumName, spotifyAlbumArtist, spotifyReleaseDate string, useAlbumTrackNumber bool, spotifyCoverURL string, embedMaxQualityCover bool, spotifyTrackNumber, spotifyDiscNumber, spotifyTotalTracks int, spotifyTotalDiscs int, spotifyCopyright, spotifyPublisher, spotifyURL string) (string, error) {
	apis, err := t.GetAvailableAPIs()
	if err != nil {
		return "", fmt.Errorf("no APIs available for fallback: %w", err)
	}

	if outputDir != "." {
		if err := os.MkdirAll(outputDir, 0755); err != nil {
			return "", fmt.Errorf("directory error: %w", err)
		}
	}

	fmt.Printf("Using Tidal URL: %s\n", tidalURL)

	trackID, err := t.GetTrackIDFromURL(tidalURL)
	if err != nil {
		return "", err
	}

	trackInfo, err := t.GetTrackInfoByID(trackID)
	if err != nil {
		return "", err
	}

	if trackInfo.ID == 0 {
		return "", fmt.Errorf("no track ID found")
	}

	artistName := spotifyArtistName
	trackTitle := spotifyTrackName
	albumTitle := spotifyAlbumName

	artistNameForFile := sanitizeFilename(artistName)
	trackTitleForFile := sanitizeFilename(trackTitle)
	albumTitleForFile := sanitizeFilename(albumTitle)
	albumArtistForFile := sanitizeFilename(spotifyAlbumArtist)

	filename := buildTidalFilename(trackTitleForFile, artistNameForFile, albumTitleForFile, albumArtistForFile, spotifyReleaseDate, trackInfo.TrackNumber, spotifyDiscNumber, filenameFormat, includeTrackNumber, position, useAlbumTrackNumber)
	outputFilename := filepath.Join(outputDir, filename)

	if fileInfo, err := os.Stat(outputFilename); err == nil && fileInfo.Size() > 0 {
		fmt.Printf("File already exists: %s (%.2f MB)\n", outputFilename, float64(fileInfo.Size())/(1024*1024))
		return "EXISTS:" + outputFilename, nil
	}

	successAPI, downloadURL, err := getDownloadURLParallel(apis, trackInfo.ID, quality)
	if err != nil {
		return "", err
	}

	fmt.Printf("Downloading to: %s\n", outputFilename)
	downloader := NewTidalDownloader(successAPI)
	if err := downloader.DownloadFile(downloadURL, outputFilename); err != nil {
		return "", err
	}

	fmt.Println("Adding metadata...")

	coverPath := ""

	if spotifyCoverURL != "" {
		coverPath = outputFilename + ".cover.jpg"
		coverClient := NewCoverClient()
		if err := coverClient.DownloadCoverToPath(spotifyCoverURL, coverPath, embedMaxQualityCover); err != nil {
			fmt.Printf("Warning: Failed to download Spotify cover: %v\n", err)
			coverPath = ""
		} else {
			defer os.Remove(coverPath)
			fmt.Println("Spotify cover downloaded")
		}
	}

	trackNumberToEmbed := spotifyTrackNumber
	if trackNumberToEmbed == 0 {
		trackNumberToEmbed = 1
	}

	metadata := Metadata{
		Title:       trackTitle,
		Artist:      artistName,
		Album:       albumTitle,
		AlbumArtist: spotifyAlbumArtist,
		Date:        spotifyReleaseDate,
		TrackNumber: trackNumberToEmbed,
		TotalTracks: spotifyTotalTracks,
		DiscNumber:  spotifyDiscNumber,
		TotalDiscs:  spotifyTotalDiscs,
		URL:         spotifyURL,
		Copyright:   spotifyCopyright,
		Publisher:   spotifyPublisher,
		Description: "https://github.com/afkarxyz/SpotiFLAC",
	}

	if err := EmbedMetadata(outputFilename, metadata, coverPath); err != nil {
		fmt.Printf("Tagging failed: %v\n", err)
	} else {
		fmt.Println("Metadata saved")
	}

	fmt.Println("Done")
	fmt.Println("✓ Downloaded successfully from Tidal")
	return outputFilename, nil
}

func (t *TidalDownloader) Download(spotifyTrackID, outputDir, quality, filenameFormat string, includeTrackNumber bool, position int, spotifyTrackName, spotifyArtistName, spotifyAlbumName, spotifyAlbumArtist, spotifyReleaseDate string, useAlbumTrackNumber bool, spotifyCoverURL string, embedMaxQualityCover bool, spotifyTrackNumber, spotifyDiscNumber, spotifyTotalTracks int, spotifyTotalDiscs int, spotifyCopyright, spotifyPublisher, spotifyURL string) (string, error) {

	tidalURL, err := t.GetTidalURLFromSpotify(spotifyTrackID)
	if err != nil {
		return "", fmt.Errorf("songlink couldn't find Tidal URL: %w", err)
	}

	return t.DownloadByURLWithFallback(tidalURL, outputDir, quality, filenameFormat, includeTrackNumber, position, spotifyTrackName, spotifyArtistName, spotifyAlbumName, spotifyAlbumArtist, spotifyReleaseDate, useAlbumTrackNumber, spotifyCoverURL, embedMaxQualityCover, spotifyTrackNumber, spotifyDiscNumber, spotifyTotalTracks, spotifyTotalDiscs, spotifyCopyright, spotifyPublisher, spotifyURL)
}

type SegmentTemplate struct {
	Initialization string `xml:"initialization,attr"`
	Media          string `xml:"media,attr"`
	Timeline       struct {
		Segments []struct {
			Duration int64 `xml:"d,attr"`
			Repeat   int   `xml:"r,attr"`
		} `xml:"S"`
	} `xml:"SegmentTimeline"`
}

type MPD struct {
	XMLName xml.Name `xml:"MPD"`
	Period  struct {
		AdaptationSets []struct {
			MimeType        string `xml:"mimeType,attr"`
			Codecs          string `xml:"codecs,attr"`
			Representations []struct {
				ID              string           `xml:"id,attr"`
				Codecs          string           `xml:"codecs,attr"`
				Bandwidth       int              `xml:"bandwidth,attr"`
				SegmentTemplate *SegmentTemplate `xml:"SegmentTemplate"`
			} `xml:"Representation"`
			SegmentTemplate *SegmentTemplate `xml:"SegmentTemplate"`
		} `xml:"AdaptationSet"`
	} `xml:"Period"`
}

func parseManifest(manifestB64 string) (directURL string, initURL string, mediaURLs []string, err error) {
	manifestBytes, err := base64.StdEncoding.DecodeString(manifestB64)
	if err != nil {
		return "", "", nil, fmt.Errorf("failed to decode manifest: %w", err)
	}

	manifestStr := string(manifestBytes)

	if strings.HasPrefix(strings.TrimSpace(manifestStr), "{") {
		var btsManifest TidalBTSManifest
		if err := json.Unmarshal(manifestBytes, &btsManifest); err != nil {
			return "", "", nil, fmt.Errorf("failed to parse BTS manifest: %w", err)
		}

		if len(btsManifest.URLs) == 0 {
			return "", "", nil, fmt.Errorf("no URLs in BTS manifest")
		}

		fmt.Printf("Manifest: BTS format (%s, %s)\n", btsManifest.MimeType, btsManifest.Codecs)
		return btsManifest.URLs[0], "", nil, nil
	}

	fmt.Println("Manifest: DASH format")

	var mpd MPD
	var segTemplate *SegmentTemplate

	if err := xml.Unmarshal(manifestBytes, &mpd); err == nil {
		var selectedBandwidth int
		var selectedCodecs string

		for _, as := range mpd.Period.AdaptationSets {

			if as.SegmentTemplate != nil {

				if segTemplate == nil {
					segTemplate = as.SegmentTemplate
					selectedCodecs = as.Codecs
				}
			}

			for _, rep := range as.Representations {
				if rep.SegmentTemplate != nil {
					if rep.Bandwidth > selectedBandwidth {
						selectedBandwidth = rep.Bandwidth
						segTemplate = rep.SegmentTemplate

						if rep.Codecs != "" {
							selectedCodecs = rep.Codecs
						} else {
							selectedCodecs = as.Codecs
						}
					}
				}
			}
		}

		if selectedBandwidth > 0 {
			fmt.Printf("Selected stream: Codec=%s, Bandwidth=%d bps\n", selectedCodecs, selectedBandwidth)
		}
	}

	var mediaTemplate string
	segmentCount := 0

	if segTemplate != nil {
		initURL = segTemplate.Initialization
		mediaTemplate = segTemplate.Media

		for _, seg := range segTemplate.Timeline.Segments {
			segmentCount += seg.Repeat + 1
		}
	}

	if segmentCount > 0 && initURL != "" && mediaTemplate != "" {
		initURL = strings.ReplaceAll(initURL, "&amp;", "&")
		mediaTemplate = strings.ReplaceAll(mediaTemplate, "&amp;", "&")

		fmt.Printf("Parsed manifest via XML: %d segments\n", segmentCount)

		for i := 1; i <= segmentCount; i++ {
			mediaURL := strings.ReplaceAll(mediaTemplate, "$Number$", fmt.Sprintf("%d", i))
			mediaURLs = append(mediaURLs, mediaURL)
		}
		return "", initURL, mediaURLs, nil
	}

	fmt.Println("Using regex fallback for DASH manifest...")

	initRe := regexp.MustCompile(`initialization="([^"]+)"`)
	mediaRe := regexp.MustCompile(`media="([^"]+)"`)

	if match := initRe.FindStringSubmatch(manifestStr); len(match) > 1 {
		initURL = match[1]
	}
	if match := mediaRe.FindStringSubmatch(manifestStr); len(match) > 1 {
		mediaTemplate = match[1]
	}

	if initURL == "" {
		return "", "", nil, fmt.Errorf("no initialization URL found in manifest")
	}

	initURL = strings.ReplaceAll(initURL, "&amp;", "&")
	mediaTemplate = strings.ReplaceAll(mediaTemplate, "&amp;", "&")

	segmentCount = 0

	segTagRe := regexp.MustCompile(`<S\s+[^>]*>`)
	matches := segTagRe.FindAllString(manifestStr, -1)

	for _, match := range matches {
		repeat := 0
		rRe := regexp.MustCompile(`r="(\d+)"`)
		if rMatch := rRe.FindStringSubmatch(match); len(rMatch) > 1 {
			fmt.Sscanf(rMatch[1], "%d", &repeat)
		}
		segmentCount += repeat + 1
	}

	if segmentCount == 0 {
		return "", "", nil, fmt.Errorf("no segments found in manifest (XML: %d, Regex: 0)", len(matches))
	}

	fmt.Printf("Parsed manifest via Regex: %d segments\n", segmentCount)

	for i := 1; i <= segmentCount; i++ {
		mediaURL := strings.ReplaceAll(mediaTemplate, "$Number$", fmt.Sprintf("%d", i))
		mediaURLs = append(mediaURLs, mediaURL)
	}

	return "", initURL, mediaURLs, nil
}

type manifestResult struct {
	apiURL   string
	manifest string
	err      error
}

func getDownloadURLParallel(apis []string, trackID int64, quality string) (string, string, error) {
	if len(apis) == 0 {
		return "", "", fmt.Errorf("no APIs available")
	}

	resultChan := make(chan manifestResult, len(apis))

	fmt.Printf("Requesting download URL from %d APIs in parallel...\n", len(apis))
	for _, apiURL := range apis {
		go func(api string) {

			client := &http.Client{
				Timeout: 15 * time.Second,
			}

			url := fmt.Sprintf("%s/track/?id=%d&quality=%s", api, trackID, quality)
			resp, err := client.Get(url)
			if err != nil {
				resultChan <- manifestResult{apiURL: api, err: err}
				return
			}
			defer resp.Body.Close()

			if resp.StatusCode != 200 {
				resultChan <- manifestResult{apiURL: api, err: fmt.Errorf("HTTP %d", resp.StatusCode)}
				return
			}

			body, err := io.ReadAll(resp.Body)
			if err != nil {
				resultChan <- manifestResult{apiURL: api, err: err}
				return
			}

			var v2Response TidalAPIResponseV2
			if err := json.Unmarshal(body, &v2Response); err == nil && v2Response.Data.Manifest != "" {
				resultChan <- manifestResult{apiURL: api, manifest: v2Response.Data.Manifest, err: nil}
				return
			}

			var v1Responses []TidalAPIResponse
			if err := json.Unmarshal(body, &v1Responses); err == nil {
				for _, item := range v1Responses {
					if item.OriginalTrackURL != "" {

						resultChan <- manifestResult{apiURL: api, manifest: "DIRECT:" + item.OriginalTrackURL, err: nil}
						return
					}
				}
			}

			resultChan <- manifestResult{apiURL: api, err: fmt.Errorf("no download URL or manifest in response")}
		}(apiURL)
	}

	var lastError error
	var errors []string

	for i := 0; i < len(apis); i++ {
		result := <-resultChan
		if result.err == nil && result.manifest != "" {

			fmt.Printf("✓ Got response from: %s\n", result.apiURL)

			if strings.HasPrefix(result.manifest, "DIRECT:") {
				return result.apiURL, strings.TrimPrefix(result.manifest, "DIRECT:"), nil
			}

			return result.apiURL, "MANIFEST:" + result.manifest, nil
		} else {
			errMsg := result.err.Error()
			if len(errMsg) > 50 {
				errMsg = errMsg[:50] + "..."
			}
			errors = append(errors, fmt.Sprintf("%s: %s", result.apiURL, errMsg))
			lastError = result.err
		}
	}

	fmt.Println("All APIs failed:")
	for _, e := range errors {
		fmt.Printf("  ✗ %s\n", e)
	}

	return "", "", fmt.Errorf("all %d APIs failed. Last error: %v", len(apis), lastError)
}

func buildTidalFilename(title, artist, album, albumArtist, releaseDate string, trackNumber, discNumber int, format string, includeTrackNumber bool, position int, useAlbumTrackNumber bool) string {
	var filename string

	numberToUse := position
	if useAlbumTrackNumber && trackNumber > 0 {
		numberToUse = trackNumber
	}

	year := ""
	if len(releaseDate) >= 4 {
		year = releaseDate[:4]
	}

	if strings.Contains(format, "{") {
		filename = format
		filename = strings.ReplaceAll(filename, "{title}", title)
		filename = strings.ReplaceAll(filename, "{artist}", artist)
		filename = strings.ReplaceAll(filename, "{album}", album)
		filename = strings.ReplaceAll(filename, "{album_artist}", albumArtist)
		filename = strings.ReplaceAll(filename, "{year}", year)

		if discNumber > 0 {
			filename = strings.ReplaceAll(filename, "{disc}", fmt.Sprintf("%d", discNumber))
		} else {
			filename = strings.ReplaceAll(filename, "{disc}", "")
		}

		if numberToUse > 0 {
			filename = strings.ReplaceAll(filename, "{track}", fmt.Sprintf("%02d", numberToUse))
		} else {

			filename = regexp.MustCompile(`\{track\}\.\s*`).ReplaceAllString(filename, "")
			filename = regexp.MustCompile(`\{track\}\s*-\s*`).ReplaceAllString(filename, "")
			filename = regexp.MustCompile(`\{track\}\s*`).ReplaceAllString(filename, "")
		}
	} else {

		switch format {
		case "artist-title":
			filename = fmt.Sprintf("%s - %s", artist, title)
		case "title":
			filename = title
		default:
			filename = fmt.Sprintf("%s - %s", title, artist)
		}

		if includeTrackNumber && position > 0 {
			filename = fmt.Sprintf("%02d. %s", numberToUse, filename)
		}
	}

	return filename + ".flac"
}