package app

import (
	"context"
	"errors"
	"fmt"
	"os/exec"
	"path/filepath"
	"regexp"
	"sort"
	"strconv"
	"strings"
	"sync"

	"streamrip-go/internal/artwork"
	"streamrip-go/internal/audio/convert"
	"streamrip-go/internal/audio/tag"
	"streamrip-go/internal/config"
	"streamrip-go/internal/domain/media"
	"streamrip-go/internal/download"
	"streamrip-go/internal/jsonutil"
	"streamrip-go/internal/naming"
	"streamrip-go/internal/provider"
	deezerprovider "streamrip-go/internal/provider/deezer"
	qobuzprovider "streamrip-go/internal/provider/qobuz"
	soundcloudprovider "streamrip-go/internal/provider/soundcloud"
	tidalprovider "streamrip-go/internal/provider/tidal"
	yandexprovider "streamrip-go/internal/provider/yandex"
	"streamrip-go/internal/store"
	"streamrip-go/internal/verbose"
)

type Main struct {
	Config    *config.Config
	Providers map[string]provider.Client
	Store     store.Database
	DL        *download.Downloader
	Tagger    trackTagger
	IgnoreDB  bool
	Pending   []media.Pending
	Media     []media.Media
}

type PlaylistTrackRef struct {
	Source string
	ID     string
}

type ripTrackOptions struct {
	albumFolder     string
	albumEmbedCover string
	albumArtist     string
	prefetched      *provider.Downloadable
	index           int
	total           int
	albumDiscTotal  int
	forPlaylist     bool
	playlistName    string
	playlistPos     int
}

type folderAudioValues struct {
	container    string
	codec        string
	quality      string
	bitDepth     int
	samplingRate string
	bitrateKbps  int
}

type collectionAlbum struct {
	ID          string
	Meta        map[string]any
	Title       string
	AlbumArtist string
	BitDepth    int
	Sampling    float64
	Explicit    bool
	TrackCount  int
}

var (
	qobuzEssenceRe  = regexp.MustCompile(`(?i)^([^\(\[]+)`)
	qobuzExtraRe    = regexp.MustCompile(`(?i)(anniversary|deluxe|live|collector|demo|expanded|remix)`)
	qobuzRemasterRe = regexp.MustCompile(`(?i)(re)?master(ed)?`)
)

type trackTagger interface {
	TagFLAC(path string, meta tag.Metadata, coverPath string) error
}

type videoDownloadableProvider interface {
	GetVideoDownloadable(ctx context.Context, videoID string) (*provider.Downloadable, error)
}

type trackFallbackDownloader interface {
	DownloadTrackFallback(ctx context.Context, trackID string, quality int, outputPath string) error
}

func New(cfg *config.Config) (*Main, error) {
	var db store.Database
	if cfg.Session.Database.DownloadsEnabled || cfg.Session.Database.FailedDownloadsEnabled {
		s, err := store.NewSQLite(cfg.Session.Database.DownloadsPath)
		if err != nil {
			return nil, err
		}
		db = s
	} else {
		db = store.NewDummy()
	}

	providers := map[string]provider.Client{
		"qobuz":      qobuzprovider.New(cfg),
		"tidal":      tidalprovider.New(cfg),
		"deezer":     deezerprovider.New(cfg),
		"yandex":     yandexprovider.New(cfg),
		"soundcloud": soundcloudprovider.New(cfg),
	}

	m := &Main{
		Config:    cfg,
		Providers: providers,
		Store:     db,
		DL:        download.NewWithOptions(cfg.Session.Downloads.VerifySSL, cfg.Session.CLI.ProgressBars, downloaderMaxConnsPerHost(cfg.Session.Downloads.MaxConnections)),
		Tagger:    tag.New(),
		Pending:   []media.Pending{},
		Media:     []media.Media{},
	}
	verbose.SetSink(func(msg string) { m.DL.Logf("%s", msg) })
	return m, nil
}

// downloaderMaxConnsPerHost picks the per-host idle connection cap for the
// shared download client. We floor at 16 so artwork/manifest fetches and
// concurrent track downloads to the same CDN host can reuse keep-alive
// sockets even when the user configured a tiny max_connections.
func downloaderMaxConnsPerHost(maxConnections int) int {
	if maxConnections > 16 {
		return maxConnections
	}
	return 16
}

func (m *Main) Close() error {
	verbose.SetSink(nil)
	m.DL.Close()
	artwork.CleanupTempDirs()
	for _, p := range m.Providers {
		_ = p.Close()
	}
	return m.Store.Close()
}

func (m *Main) logf(format string, args ...any) {
	if m != nil && m.DL != nil {
		m.DL.Logf(format, args...)
		return
	}
	fmt.Printf(format, args...)
}

func (m *Main) GetLoggedInProvider(ctx context.Context, source string) (provider.Client, error) {
	p, ok := m.Providers[source]
	if !ok {
		return nil, fmt.Errorf("provider %q not registered", source)
	}
	if !p.LoggedIn() {
		if err := p.Login(ctx); err != nil {
			return nil, err
		}
	}
	return p, nil
}

func (m *Main) AddByID(ctx context.Context, source, mediaType, id string) error {
	p, err := m.GetLoggedInProvider(ctx, source)
	if err != nil {
		return err
	}

	pending := media.PendingFunc{
		ResolveFn: func(ctx context.Context) (media.Media, error) {
			meta, err := p.GetMetadata(ctx, id, mediaType)
			if err != nil {
				_ = m.Store.MarkFailed(ctx, source, mediaType, id)
				return nil, err
			}

			displayTitle := titleFromMetadata(meta, id)

			return media.MediaFunc{RipFn: func(ctx context.Context) error {
				if m.Config.Session.CLI.TextOutput {
					m.logf("Downloading %s: %s\n", mediaType, displayTitle)
				}
				switch mediaType {
				case "track":
					title := titleFromMetadata(meta, id)
					return m.ripTrack(ctx, p, source, id, title, ripTrackOptions{})
				case "album":
					return m.ripAlbum(ctx, p, source, id, meta)
				case "playlist":
					return m.ripPlaylist(ctx, p, source, id, meta)
				case "artist":
					return m.ripCollection(ctx, p, source, "Artist", id, meta)
				case "label":
					return m.ripCollection(ctx, p, source, "Label", id, meta)
				case "video":
					return m.ripVideo(ctx, p, source, id, meta)
				default:
					return fmt.Errorf("unsupported media type %q", mediaType)
				}
			}}, nil
		},
	}

	m.Pending = append(m.Pending, pending)
	return nil
}

func (m *Main) AddPlaylistByTrackIDs(ctx context.Context, source, playlistID, playlistName string, trackIDs []string) error {
	p, err := m.GetLoggedInProvider(ctx, source)
	if err != nil {
		return err
	}
	if strings.TrimSpace(playlistName) == "" {
		playlistName = playlistID
	}
	ids := make([]string, 0, len(trackIDs))
	for _, id := range trackIDs {
		id = strings.TrimSpace(id)
		if id != "" {
			ids = append(ids, id)
		}
	}
	if len(ids) == 0 {
		return fmt.Errorf("playlist %q has no track ids", playlistName)
	}

	pending := media.PendingFunc{
		ResolveFn: func(context.Context) (media.Media, error) {
			metaItems := make([]any, 0, len(ids))
			for _, id := range ids {
				metaItems = append(metaItems, map[string]any{"id": id})
			}
			playlistMeta := map[string]any{
				"name":   playlistName,
				"tracks": map[string]any{"items": metaItems},
			}
			return media.MediaFunc{RipFn: func(ctx context.Context) error {
				if m.Config.Session.CLI.TextOutput {
					m.logf("Downloading playlist: %s\n", playlistName)
				}
				return m.ripPlaylist(ctx, p, source, playlistID, playlistMeta)
			}}, nil
		},
	}
	m.Pending = append(m.Pending, pending)
	return nil
}

func (m *Main) AddMixedPlaylistByTrackRefs(ctx context.Context, playlistID, playlistName string, refs []PlaylistTrackRef) error {
	if strings.TrimSpace(playlistName) == "" {
		playlistName = playlistID
	}
	valid := make([]PlaylistTrackRef, 0, len(refs))
	for _, ref := range refs {
		source := strings.TrimSpace(ref.Source)
		id := strings.TrimSpace(ref.ID)
		if source == "" || id == "" {
			continue
		}
		valid = append(valid, PlaylistTrackRef{Source: source, ID: id})
	}
	if len(valid) == 0 {
		return fmt.Errorf("playlist %q has no track refs", playlistName)
	}

	pending := media.PendingFunc{
		ResolveFn: func(context.Context) (media.Media, error) {
			return media.MediaFunc{RipFn: func(ctx context.Context) error {
				if m.Config.Session.CLI.TextOutput {
					m.logf("Downloading playlist: %s\n", playlistName)
				}
				return m.ripPlaylistMixed(ctx, playlistID, playlistName, valid)
			}}, nil
		},
	}
	m.Pending = append(m.Pending, pending)
	return nil
}

func (m *Main) ripCollection(ctx context.Context, p provider.Client, source, kind, id string, meta map[string]any) error {
	name := titleFromMetadata(meta, id)
	if n := jsonutil.StringFromAny(meta["name"]); n != "" {
		name = n
	}

	albumIDs := extractAlbumIDs(meta)
	m.logf("%s: %s (%d albums)\n", kind, name, len(albumIDs))
	failures := 0
	albums := make([]collectionAlbum, 0, len(albumIDs))
	for i, albumID := range albumIDs {
		albumMeta, err := p.GetMetadata(ctx, albumID, "album")
		if err != nil {
			failures++
			m.logf("album failed [%d/%d]: id=%s reason=%v\n", i+1, len(albumIDs), albumID, err)
			continue
		}
		albums = append(albums, buildCollectionAlbum(albumID, albumMeta))
	}

	if source == "qobuz" && kind == "Artist" {
		before := len(albums)
		albums = applyQobuzArtistFilters(name, albums, m.Config.Session.QobuzFilters)
		m.logf("Artist filters applied: %d -> %d albums\n", before, len(albums))
	}

	for i, album := range albums {
		if err := m.ripAlbum(ctx, p, source, album.ID, album.Meta); err != nil {
			failures++
			m.logf("album failed [%d/%d]: id=%s reason=%v\n", i+1, len(albums), album.ID, err)
		}
	}
	if failures > 0 {
		m.logf("%s done with %d failed album(s)\n", kind, failures)
	}
	return nil
}

func (m *Main) ripVideo(ctx context.Context, p provider.Client, source, videoID string, meta map[string]any) error {
	alreadyDownloaded, err := m.Store.IsDownloaded(ctx, source, videoID)
	if err == nil && alreadyDownloaded && !m.IgnoreDB {
		m.logf("skip (already downloaded) id=%s\n", videoID)
		return nil
	}

	vp, ok := p.(videoDownloadableProvider)
	if !ok {
		return fmt.Errorf("provider %q does not support video downloads", source)
	}

	d, err := vp.GetVideoDownloadable(ctx, videoID)
	if err != nil {
		_ = m.Store.MarkFailed(ctx, source, "video", videoID)
		return fmt.Errorf("id=%s get_video_downloadable: %w", videoID, err)
	}

	title := titleFromMetadata(meta, videoID)
	outPath := m.videoOutputPath(source, videoID, title, d.Extension)
	if err = m.DL.FileVideo(ctx, d.URL, outPath); err != nil {
		_ = m.Store.MarkFailed(ctx, source, "video", videoID)
		return fmt.Errorf("id=%s title=%q video download: %w", videoID, title, err)
	}

	if err = m.Store.MarkDownloaded(ctx, source, videoID); err != nil {
		return err
	}
	return nil
}

func buildCollectionAlbum(id string, meta map[string]any) collectionAlbum {
	trackCount := jsonutil.IntFromAny(meta["tracks_count"])
	if trackCount == 0 {
		trackCount = jsonutil.IntFromAny(meta["numberOfTracks"])
	}
	return collectionAlbum{
		ID:          id,
		Meta:        meta,
		Title:       titleFromMetadata(meta, id),
		AlbumArtist: jsonutil.NestedString(meta, "artist", "name"),
		BitDepth:    jsonutil.IntFromAny(meta["maximum_bit_depth"]),
		Sampling:    jsonutil.FloatFromAny(meta["maximum_sampling_rate"]),
		Explicit:    jsonutil.BoolFromAny(meta["parental_warning"]),
		TrackCount:  trackCount,
	}
}

func applyQobuzArtistFilters(artistName string, albums []collectionAlbum, filt config.QobuzDiscographyFilterConfig) []collectionAlbum {
	out := append([]collectionAlbum(nil), albums...)

	if filt.Repeats {
		out = filterQobuzRepeats(out)
	}
	if filt.Extras {
		tmp := out[:0]
		for _, a := range out {
			if !qobuzExtraRe.MatchString(a.Title) {
				tmp = append(tmp, a)
			}
		}
		out = tmp
	}
	if filt.Features {
		tmp := out[:0]
		for _, a := range out {
			if a.AlbumArtist == artistName {
				tmp = append(tmp, a)
			}
		}
		out = tmp
	}
	if filt.NonStudioAlbums {
		tmp := out[:0]
		for _, a := range out {
			if a.AlbumArtist != "Various Artists" && !qobuzExtraRe.MatchString(a.Title) {
				tmp = append(tmp, a)
			}
		}
		out = tmp
	}
	if filt.NonRemaster {
		tmp := out[:0]
		for _, a := range out {
			if !qobuzRemasterRe.MatchString(a.Title) {
				tmp = append(tmp, a)
			}
		}
		out = tmp
	}
	if filt.NonAlbums {
		tmp := out[:0]
		for _, a := range out {
			if a.TrackCount > 1 {
				tmp = append(tmp, a)
			}
		}
		out = tmp
	}

	return out
}

func filterQobuzRepeats(albums []collectionAlbum) []collectionAlbum {
	groups := map[string][]collectionAlbum{}
	for _, a := range albums {
		title := strings.TrimSpace(strings.ToLower(a.Title))
		if m := qobuzEssenceRe.FindStringSubmatch(title); len(m) >= 2 {
			title = strings.TrimSpace(m[1])
		}
		groups[title] = append(groups[title], a)
	}

	out := make([]collectionAlbum, 0, len(groups))
	for _, g := range groups {
		sort.SliceStable(g, func(i, j int) bool {
			if g[i].BitDepth != g[j].BitDepth {
				return g[i].BitDepth > g[j].BitDepth
			}
			if g[i].Sampling != g[j].Sampling {
				return g[i].Sampling > g[j].Sampling
			}
			if g[i].Explicit != g[j].Explicit {
				return g[i].Explicit
			}
			return g[i].Title < g[j].Title
		})
		out = append(out, g[0])
	}
	return out
}

func extractAlbumIDs(meta map[string]any) []string {
	albumsObj, ok := meta["albums"]
	if !ok {
		return nil
	}

	items := make([]any, 0)
	switch a := albumsObj.(type) {
	case map[string]any:
		switch v := a["items"].(type) {
		case []any:
			items = v
		case []map[string]any:
			for _, it := range v {
				items = append(items, it)
			}
		}
	case []any:
		items = a
	case []map[string]any:
		for _, it := range a {
			items = append(items, it)
		}
	}

	out := make([]string, 0, len(items))
	seen := map[string]struct{}{}
	for _, raw := range items {
		itm, ok := raw.(map[string]any)
		if !ok {
			continue
		}
		id := jsonutil.StringFromAny(itm["id"])
		if id == "" {
			if nested, ok := itm["album"].(map[string]any); ok {
				id = jsonutil.StringFromAny(nested["id"])
			}
		}
		if id == "" {
			continue
		}
		if _, dup := seen[id]; dup {
			continue
		}
		seen[id] = struct{}{}
		out = append(out, id)
	}
	return out
}

func (m *Main) Resolve(ctx context.Context) error {
	pendingCount := len(m.Pending)
	resolved := make([]media.Media, 0, len(m.Pending))
	for _, item := range m.Pending {
		med, err := item.Resolve(ctx)
		if err != nil {
			m.logf("resolve failed: %v\n", err)
			continue
		}
		resolved = append(resolved, med)
	}
	m.Media = append(m.Media, resolved...)
	m.Pending = m.Pending[:0]
	if pendingCount > 0 && len(resolved) == 0 {
		return fmt.Errorf("resolve failed for all %d pending item(s)", pendingCount)
	}
	return nil
}

func (m *Main) Rip(ctx context.Context) error {
	m.logf("Ripping %d media item(s)\n", len(m.Media))
	failures := 0
	for _, item := range m.Media {
		if err := item.Rip(ctx); err != nil {
			failures++
			m.logf("media item failed: %v\n", err)
		}
	}
	if failures > 0 {
		return fmt.Errorf("%d media item(s) failed", failures)
	}
	return nil
}

func (m *Main) ripAlbum(ctx context.Context, p provider.Client, source, albumID string, albumMeta map[string]any) error {
	if err := m.requireSourceDownloadAuth(source); err != nil {
		return err
	}

	albumTitle := titleFromMetadata(albumMeta, albumID)
	albumArtist := jsonutil.NestedString(albumMeta, "artist", "name")
	if albumArtist == "" {
		albumArtist = "Unknown"
	}
	releaseDate := jsonutil.StringFromAny(albumMeta["release_date_original"])
	if releaseDate == "" {
		releaseDate = jsonutil.StringFromAny(albumMeta["release_date"])
	}
	if releaseDate == "" {
		releaseDate = jsonutil.StringFromAny(albumMeta["releaseDate"])
	}
	if releaseDate == "" {
		releaseDate = jsonutil.StringFromAny(albumMeta["streamStartDate"])
	}
	year := naming.YearFromDate(releaseDate)
	bitDepth := jsonutil.IntFromAny(albumMeta["maximum_bit_depth"])
	sampling := jsonutil.StringFromAny(albumMeta["maximum_sampling_rate"])

	tracksMap, ok := albumMeta["tracks"].(map[string]any)
	if !ok {
		return fmt.Errorf("album missing tracks data")
	}
	rawItems := make([]any, 0)
	if itemsAny, ok := tracksMap["items"].([]any); ok {
		rawItems = itemsAny
	} else if itemsMap, ok := tracksMap["items"].([]map[string]any); ok {
		for _, item := range itemsMap {
			rawItems = append(rawItems, item)
		}
	} else {
		return fmt.Errorf("album tracks missing items")
	}
	trackIDs := make([]string, 0, len(rawItems))
	for _, item := range rawItems {
		itm, ok := item.(map[string]any)
		if !ok {
			continue
		}
		id := jsonutil.StringFromAny(itm["id"])
		if id != "" {
			trackIDs = append(trackIDs, id)
		}
	}

	var prefetched *provider.Downloadable
	if len(trackIDs) > 0 {
		if d, dErr := p.GetDownloadable(ctx, trackIDs[0], m.qualityForSource(source)); dErr == nil {
			prefetched = d
		}
	}
	audioVals := m.folderAudioValues(source, bitDepth, sampling, prefetched)
	folder := m.albumFolderPath(source, albumID, albumTitle, albumArtist, year, audioVals)
	artRes, _ := artwork.Prepare(ctx, m.DL, folder, albumMeta, m.Config.Session.Artwork, false)
	total := len(trackIDs)
	discTotal := jsonutil.IntFromAny(albumMeta["media_count"])
	if discTotal == 0 {
		discTotal = jsonutil.IntFromAny(albumMeta["numberOfVolumes"])
	}
	m.logf("Album: %s (%d tracks)\n", albumTitle, total)
	failures := 0

	if !m.Config.Session.Downloads.Concurrency || m.Config.Session.Downloads.MaxConnections == 1 {
		for i, trackID := range trackIDs {
			opts := ripTrackOptions{albumFolder: folder, albumEmbedCover: artRes.EmbedPath, albumArtist: albumArtist, index: i + 1, total: total, albumDiscTotal: discTotal}
			if i == 0 {
				opts.prefetched = prefetched
			}
			if err := m.ripTrack(ctx, p, source, trackID, "", opts); err != nil {
				failures++
				m.logf("track failed: id=%s reason=%v\n", trackID, err)
			}
		}
		if failures > 0 {
			m.logf("Album done with %d failed track(s)\n", failures)
		}
		return nil
	}

	maxWorkers := m.Config.Session.Downloads.MaxConnections
	if maxWorkers <= 0 {
		maxWorkers = 6
	}
	sem := make(chan struct{}, maxWorkers)
	var wg sync.WaitGroup
	errCh := make(chan error, len(trackIDs))
	for i, trackID := range trackIDs {
		wg.Add(1)
		sem <- struct{}{}
		go func(idx int, tid string) {
			defer wg.Done()
			defer func() { <-sem }()
			opts := ripTrackOptions{albumFolder: folder, albumEmbedCover: artRes.EmbedPath, albumArtist: albumArtist, index: idx, total: total, albumDiscTotal: discTotal}
			if idx == 1 {
				opts.prefetched = prefetched
			}
			if err := m.ripTrack(ctx, p, source, tid, "", opts); err != nil {
				errCh <- err
			}
		}(i+1, trackID)
	}
	wg.Wait()
	close(errCh)
	for err := range errCh {
		failures++
		m.logf("track failed: reason=%v\n", err)
	}
	if failures > 0 {
		m.logf("Album done with %d failed track(s)\n", failures)
	}
	return nil
}

func (m *Main) ripPlaylist(ctx context.Context, p provider.Client, source, playlistID string, playlistMeta map[string]any) error {
	if err := m.requireSourceDownloadAuth(source); err != nil {
		return err
	}

	name := titleFromMetadata(playlistMeta, playlistID)
	if n := jsonutil.StringFromAny(playlistMeta["name"]); n != "" {
		name = n
	}
	base := m.Config.Session.Downloads.Folder
	if m.Config.Session.Downloads.SourceSubdirectories {
		base = filepath.Join(base, jsonutil.TitleCase(source))
	}
	folder := filepath.Join(base, naming.CleanName(name, naming.Config{
		RestrictCharacters: m.Config.Session.Filepaths.RestrictCharacters,
		TruncateTo:         m.Config.Session.Filepaths.TruncateTo,
	}))

	tracksMap, ok := playlistMeta["tracks"].(map[string]any)
	if !ok {
		return fmt.Errorf("playlist missing tracks data")
	}
	rawItems, ok := tracksMap["items"].([]any)
	if !ok {
		if itemsMap, ok2 := tracksMap["items"].([]map[string]any); ok2 {
			rawItems = make([]any, 0, len(itemsMap))
			for _, it := range itemsMap {
				rawItems = append(rawItems, it)
			}
		} else {
			return fmt.Errorf("playlist tracks missing items")
		}
	}

	ids := make([]string, 0, len(rawItems))
	for _, raw := range rawItems {
		itm, ok := raw.(map[string]any)
		if !ok {
			continue
		}
		id := jsonutil.StringFromAny(itm["id"])
		if id == "" {
			id = jsonutil.StringFromAny(itm["track_id"])
		}
		if id != "" {
			ids = append(ids, id)
		}
	}

	total := len(ids)
	m.logf("Playlist: %s (%d tracks)\n", name, total)
	failures := 0

	runOne := func(i int, id string) {
		opts := ripTrackOptions{
			albumFolder:  folder,
			index:        i,
			total:        total,
			forPlaylist:  true,
			playlistName: name,
			playlistPos:  i,
		}
		if err := m.ripTrack(ctx, p, source, id, "", opts); err != nil {
			failures++
			m.logf("track failed: id=%s reason=%v\n", id, err)
		}
	}

	if !m.Config.Session.Downloads.Concurrency || m.Config.Session.Downloads.MaxConnections == 1 {
		for i, id := range ids {
			runOne(i+1, id)
		}
	} else {
		maxWorkers := m.Config.Session.Downloads.MaxConnections
		if maxWorkers <= 0 {
			maxWorkers = 6
		}
		sem := make(chan struct{}, maxWorkers)
		var wg sync.WaitGroup
		var mu sync.Mutex
		for i, id := range ids {
			wg.Add(1)
			sem <- struct{}{}
			go func(pos int, tid string) {
				defer wg.Done()
				defer func() { <-sem }()
				opts := ripTrackOptions{albumFolder: folder, index: pos, total: total, forPlaylist: true, playlistName: name, playlistPos: pos}
				if err := m.ripTrack(ctx, p, source, tid, "", opts); err != nil {
					mu.Lock()
					failures++
					m.logf("track failed: id=%s reason=%v\n", tid, err)
					mu.Unlock()
				}
			}(i+1, id)
		}
		wg.Wait()
	}

	if failures > 0 {
		m.logf("Playlist done with %d failed track(s)\n", failures)
	}
	return nil
}

func (m *Main) ripPlaylistMixed(ctx context.Context, playlistID, name string, refs []PlaylistTrackRef) error {
	requiredSources := map[string]struct{}{}
	for _, ref := range refs {
		s := strings.TrimSpace(ref.Source)
		if s == "" {
			continue
		}
		requiredSources[s] = struct{}{}
	}
	for source := range requiredSources {
		if err := m.requireSourceDownloadAuth(source); err != nil {
			return err
		}
	}

	folder := filepath.Join(m.Config.Session.Downloads.Folder, naming.CleanName(name, naming.Config{
		RestrictCharacters: m.Config.Session.Filepaths.RestrictCharacters,
		TruncateTo:         m.Config.Session.Filepaths.TruncateTo,
	}))

	total := len(refs)
	m.logf("Playlist: %s (%d tracks)\n", name, total)
	failures := 0

	providerCache := map[string]provider.Client{}
	getProvider := func(source string) (provider.Client, error) {
		if p, ok := providerCache[source]; ok {
			return p, nil
		}
		p, err := m.GetLoggedInProvider(ctx, source)
		if err != nil {
			return nil, err
		}
		providerCache[source] = p
		return p, nil
	}

	for i, ref := range refs {
		p, err := getProvider(ref.Source)
		if err != nil {
			failures++
			m.logf("track failed: id=%s source=%s reason=%v\n", ref.ID, ref.Source, err)
			continue
		}
		opts := ripTrackOptions{
			albumFolder:  folder,
			index:        i + 1,
			total:        total,
			forPlaylist:  true,
			playlistName: name,
			playlistPos:  i + 1,
		}
		if err = m.ripTrack(ctx, p, ref.Source, ref.ID, "", opts); err != nil {
			failures++
			m.logf("track failed: id=%s source=%s reason=%v\n", ref.ID, ref.Source, err)
		}
	}

	if failures > 0 {
		m.logf("Playlist done with %d failed track(s)\n", failures)
	}
	return nil
}

func (m *Main) requireSourceDownloadAuth(source string) error {
	if source == "deezer" {
		hasARL := strings.TrimSpace(m.Config.Session.Deezer.ARL) != ""
		hasCreds := strings.TrimSpace(m.Config.Session.Deezer.Email) != "" && strings.TrimSpace(m.Config.Session.Deezer.Password) != ""
		hasRefresh := strings.TrimSpace(m.Config.Session.Deezer.RefreshToken) != ""
		if !hasARL && !hasCreds && !hasRefresh {
			return fmt.Errorf("deezer native download requires deezer.arl, deezer.email+deezer.password, or deezer.refresh_token")
		}
	}
	return nil
}

func (m *Main) ripTrack(ctx context.Context, p provider.Client, source, id, fallbackTitle string, opts ripTrackOptions) error {
	if !m.IgnoreDB {
		alreadyDownloaded, err := m.Store.IsDownloaded(ctx, source, id)
		if err == nil && alreadyDownloaded {
			if opts.total > 0 {
				m.logf("[%d/%d] skip (already downloaded) id=%s\n", opts.index, opts.total, id)
			} else {
				m.logf("skip (already downloaded) id=%s\n", id)
			}
			return nil
		}
	}

	meta, err := p.GetMetadata(ctx, id, "track")
	if err != nil {
		_ = m.Store.MarkFailed(ctx, source, "track", id)
		return fmt.Errorf("id=%s metadata: %w", id, err)
	}

	title := titleFromMetadata(meta, id)
	if title == id && fallbackTitle != "" {
		title = fallbackTitle
	}

	if opts.forPlaylist {
		applyPlaylistMetadataOverrides(meta, m.Config.Session.Metadata, opts.playlistName, opts.playlistPos)
	}

	d := opts.prefetched
	if d == nil {
		d, err = p.GetDownloadable(ctx, id, m.qualityForSource(source))
		if err != nil {
			_ = m.Store.MarkFailed(ctx, source, "track", id)
			return fmt.Errorf("id=%s title=%q get_downloadable: %w", id, title, err)
		}
	}

	outPath := m.trackOutputPath(source, id, title, d.Extension, d, meta, opts.albumFolder, opts.albumDiscTotal)
	if opts.total > 0 && (!m.Config.Session.CLI.ProgressBars || !m.Config.Session.CLI.TextOutput || !m.DL.ProgressEnabled()) {
		m.logf("[%d/%d] %s\n", opts.index, opts.total, filepath.Base(outPath))
	}
	downloadOnce := func() error {
		if d.Source == "deezer" && strings.EqualFold(strings.TrimSpace(d.Cipher), "BF_CBC_STRIPE") {
			trackID := d.TrackID
			if strings.TrimSpace(trackID) == "" {
				trackID = id
			}
			return m.DL.FileDeezerEncrypted(ctx, d.URL, outPath, trackID)
		}
		if d.Source == "yandex" && strings.EqualFold(strings.TrimSpace(d.Cipher), "AES_CTR") {
			return m.DL.FileYandexEncrypted(ctx, d.URL, outPath, d.Key)
		}
		return m.DL.File(ctx, d.URL, outPath)
	}
	if err = downloadOnce(); err != nil {
		m.logf("retry: %s (%v)\n", filepath.Base(outPath), err)
		if err = downloadOnce(); err != nil {
			if fallbackProvider, ok := p.(trackFallbackDownloader); ok {
				m.logf("fallback: %s via provider backup flow\n", filepath.Base(outPath))
				if fbErr := fallbackProvider.DownloadTrackFallback(ctx, id, m.qualityForSource(source), outPath); fbErr == nil {
					goto downloaded
				} else {
					m.logf("fallback failed: %s (%v)\n", filepath.Base(outPath), fbErr)
				}
			}
			_ = m.Store.MarkFailed(ctx, source, "track", id)
			return fmt.Errorf("id=%s title=%q download: %w", id, title, err)
		}
	}

downloaded:

	embedCoverPath := opts.albumEmbedCover
	if opts.forPlaylist {
		parent := opts.albumFolder
		if parent == "" {
			parent = filepath.Dir(outPath)
		}
		if res, prepErr := artwork.Prepare(ctx, m.DL, parent, trackMetaAlbum(meta), m.Config.Session.Artwork, true); prepErr == nil {
			if res.EmbedPath != "" {
				embedCoverPath = res.EmbedPath
			}
		}
	} else if opts.albumFolder == "" {
		parent := filepath.Dir(outPath)
		if res, prepErr := artwork.Prepare(ctx, m.DL, parent, trackMetaAlbum(meta), m.Config.Session.Artwork, false); prepErr == nil {
			if res.EmbedPath != "" {
				embedCoverPath = res.EmbedPath
			}
		}
	}

	tagMeta := buildTagMetadata(meta, title, source, id, opts)
	coverPath := ""
	if m.Config.Session.Artwork.Embed {
		coverPath = embedCoverPath
		if coverPath == "" {
			coverPath = tag.CoverPathForTrack(outPath, opts.albumFolder)
		}
	}
	if err = m.Tagger.TagFLAC(outPath, tagMeta, coverPath); err != nil {
		if isFFmpegMissingError(err) {
			_ = m.Store.MarkFailed(ctx, source, "track", id)
			return fmt.Errorf("id=%s title=%q tag: %w", id, title, err)
		}
		m.logf("warning: tag failed for %s: %v\n", filepath.Base(outPath), err)
	}

	if m.Config.Session.Conversion.Enabled {
		convertedPath, convErr := convert.Convert(outPath, m.Config.Session.Conversion)
		if convErr != nil {
			_ = m.Store.MarkFailed(ctx, source, "track", id)
			return fmt.Errorf("id=%s title=%q convert: %w", id, title, convErr)
		}
		outPath = convertedPath
	}

	return m.Store.MarkDownloaded(ctx, source, id)
}

func (m *Main) qualityForSource(source string) int {
	switch source {
	case "qobuz":
		return m.Config.Session.Qobuz.Quality
	case "tidal":
		return m.Config.Session.Tidal.Quality
	case "deezer":
		return m.Config.Session.Deezer.Quality
	case "yandex":
		return m.Config.Session.Yandex.Quality
	case "soundcloud":
		return m.Config.Session.Soundcloud.Quality
	default:
		return 0
	}
}

func (m *Main) qualityProfileForSource(source string) (int, string) {
	q := m.qualityForSource(source)
	switch source {
	case "qobuz":
		switch {
		case q >= 4:
			return 24, "192"
		case q >= 3:
			return 24, "96"
		case q >= 2:
			return 16, "44.1"
		default:
			return 16, "44.1"
		}
	case "tidal":
		switch {
		case q >= 3:
			return 24, "96"
		case q >= 2:
			return 16, "44.1"
		default:
			return 16, "44.1"
		}
	case "yandex":
		return 16, "44.1"
	default:
		return 16, "44.1"
	}
}

func (m *Main) folderAudioValues(source string, metaBitDepth int, metaSampling string, d *provider.Downloadable) folderAudioValues {
	vals := folderAudioValues{
		container: "FLAC",
		bitDepth:  metaBitDepth,
		quality:   "Unknown",
		codec:     "Unknown",
	}
	if s := strings.TrimSpace(metaSampling); s != "" {
		vals.samplingRate = s
	}

	if d != nil {
		if c := strings.TrimSpace(d.Audio.Container); c != "" {
			vals.container = strings.ToUpper(c)
		} else if c := containerFromExtension(d.Extension); c != "" {
			vals.container = c
		}
		if d.Audio.BitDepth > 0 {
			vals.bitDepth = d.Audio.BitDepth
		}
		if s := strings.TrimSpace(d.Audio.SamplingRate); s != "" {
			vals.samplingRate = s
		}
		if c := strings.TrimSpace(d.Audio.Codec); c != "" {
			vals.codec = c
		}
		if q := strings.TrimSpace(d.Audio.Quality); q != "" {
			vals.quality = q
		}
		if d.Audio.BitrateKbps > 0 {
			vals.bitrateKbps = d.Audio.BitrateKbps
		}
	}

	if vals.bitDepth == 0 || vals.samplingRate == "" {
		fallbackBitDepth, fallbackSampling := m.qualityProfileForSource(source)
		if vals.bitDepth == 0 {
			vals.bitDepth = fallbackBitDepth
		}
		if vals.samplingRate == "" {
			vals.samplingRate = fallbackSampling
		}
	}
	if vals.codec == "Unknown" {
		vals.codec = vals.container
	}
	return vals
}

func containerFromExtension(ext string) string {
	switch strings.ToLower(strings.TrimSpace(ext)) {
	case "flac":
		return "FLAC"
	case "mp3":
		return "MP3"
	case "m4a", "aac":
		return "M4A"
	case "mka":
		return "MKA"
	default:
		v := strings.ToUpper(strings.TrimSpace(ext))
		if v == "" {
			return ""
		}
		return v
	}
}

func (m *Main) albumFolderPath(source, albumID, albumTitle, albumArtist, year string, audio folderAudioValues) string {
	base := m.Config.Session.Downloads.Folder
	if m.Config.Session.Downloads.SourceSubdirectories {
		base = filepath.Join(base, jsonutil.TitleCase(source))
	}

	bitrate := "Unknown"
	if audio.bitrateKbps > 0 {
		bitrate = strconv.Itoa(audio.bitrateKbps)
	}
	vals := map[string]string{
		"albumartist":   albumArtist,
		"title":         albumTitle,
		"year":          year,
		"bit_depth":     strconv.Itoa(audio.bitDepth),
		"sampling_rate": audio.samplingRate,
		"id":            albumID,
		"container":     audio.container,
		"codec":         audio.codec,
		"quality":       audio.quality,
		"bitrate":       bitrate,
		"albumcomposer": "Unknown",
	}
	folderName := naming.FormatTemplate(m.Config.Session.Filepaths.FolderFormat, vals)
	folderName = naming.CleanName(folderName, naming.Config{
		RestrictCharacters: m.Config.Session.Filepaths.RestrictCharacters,
		TruncateTo:         m.Config.Session.Filepaths.TruncateTo,
	})

	return filepath.Join(base, folderName)
}

func (m *Main) trackOutputPath(source, id, title, ext string, d *provider.Downloadable, trackMeta map[string]any, albumFolder string, albumDiscTotal int) string {
	base := m.Config.Session.Downloads.Folder
	if m.Config.Session.Downloads.SourceSubdirectories {
		base = filepath.Join(base, jsonutil.TitleCase(source))
	}

	if albumFolder == "" && m.Config.Session.Filepaths.AddSinglesToFolder {
		albumTitle := jsonutil.NestedString(trackMeta, "album", "title")
		albumID := jsonutil.NestedString(trackMeta, "album", "id")
		if albumID == "" {
			albumID = id
		}
		albumArtist := jsonutil.NestedString(trackMeta, "album", "artist", "name")
		if albumArtist == "" {
			albumArtist = jsonutil.NestedString(trackMeta, "performer", "name")
		}
		albumYear := naming.YearFromDate(jsonutil.StringFromAny(trackMeta["release_date_original"]))
		if albumYear == "Unknown" {
			albumYear = naming.YearFromDate(jsonutil.StringFromAny(trackMeta["release_date"]))
		}
		audioVals := m.folderAudioValues(source, jsonutil.IntFromAny(trackMeta["maximum_bit_depth"]), jsonutil.StringFromAny(trackMeta["maximum_sampling_rate"]), d)
		albumFolder = m.albumFolderPath(source, albumID, albumTitle, albumArtist, albumYear, audioVals)
	}
	if albumFolder != "" {
		base = albumFolder
		if m.Config.Session.Downloads.DiscSubdirectories && albumDiscTotal > 1 {
			discNumber := jsonutil.IntFromAny(trackMeta["media_number"])
			if discNumber == 0 {
				discNumber = jsonutil.IntFromAny(trackMeta["volumeNumber"])
			}
			if discNumber == 0 {
				discNumber = jsonutil.IntFromAny(trackMeta["disk_number"])
			}
			if discNumber == 0 {
				discNumber = 1
			}
			if discNumber > 0 {
				base = filepath.Join(base, "Disc "+strconv.Itoa(discNumber))
			}
		}
	}

	trackNumber := jsonutil.IntFromAny(trackMeta["track_number"])
	if trackNumber == 0 {
		trackNumber = jsonutil.IntFromAny(trackMeta["trackNumber"])
	}
	explicit := ""
	if jsonutil.BoolFromAny(trackMeta["parental_warning"]) || jsonutil.BoolFromAny(trackMeta["explicit"]) {
		explicit = " (Explicit)"
	}
	artist := jsonutil.NestedString(trackMeta, "performer", "name")
	if artist == "" {
		artist = jsonutil.NestedString(trackMeta, "artist", "name")
	}
	albumArtist := jsonutil.NestedString(trackMeta, "album", "artist", "name")
	if albumArtist == "" {
		albumArtist = artist
	}
	values := map[string]string{
		"id":            id,
		"tracknumber":   strconv.Itoa(trackNumber),
		"artist":        artist,
		"albumartist":   albumArtist,
		"composer":      "Unknown",
		"title":         title,
		"albumcomposer": "Unknown",
		"explicit":      explicit,
	}
	fileName := naming.FormatTemplate(m.Config.Session.Filepaths.TrackFormat, values)
	fileName = naming.CleanName(fileName, naming.Config{
		RestrictCharacters: m.Config.Session.Filepaths.RestrictCharacters,
		TruncateTo:         m.Config.Session.Filepaths.TruncateTo,
	})
	return filepath.Join(base, fileName+"."+ext)
}

func (m *Main) videoOutputPath(source, id, title, ext string) string {
	if strings.TrimSpace(ext) == "" {
		ext = "mp4"
	}
	base := m.Config.Session.Downloads.Folder
	if m.Config.Session.Downloads.SourceSubdirectories {
		base = filepath.Join(base, jsonutil.TitleCase(source))
	}
	fileName := naming.CleanName(title, naming.Config{
		RestrictCharacters: m.Config.Session.Filepaths.RestrictCharacters,
		TruncateTo:         m.Config.Session.Filepaths.TruncateTo,
	})
	if fileName == "" {
		fileName = id
	}
	return filepath.Join(base, fileName+"."+ext)
}

func titleFromMetadata(meta map[string]any, fallback string) string {
	if title, ok := meta["title"].(string); ok {
		title = strings.TrimSpace(title)
		version := strings.TrimSpace(jsonutil.StringFromAny(meta["version"]))
		if version != "" {
			return title + " (" + version + ")"
		}
		if title != "" {
			return title
		}
	}
	return fallback
}

func replaygainGainFromAny(v any) string {
	s := strings.TrimSpace(jsonutil.StringFromAny(v))
	if s == "" {
		return ""
	}

	lower := strings.ToLower(s)
	if strings.HasSuffix(lower, "db") {
		n := strings.TrimSpace(s[:len(s)-2])
		if n == "" {
			return ""
		}
		return n + " dB"
	}

	if _, err := strconv.ParseFloat(s, 64); err == nil {
		return s + " dB"
	}
	return s
}

func replaygainPeakFromAny(v any) string {
	return strings.TrimSpace(jsonutil.StringFromAny(v))
}

func trackMetaAlbum(trackMeta map[string]any) map[string]any {
	album, ok := trackMeta["album"].(map[string]any)
	if !ok {
		return map[string]any{}
	}
	return album
}

func buildTagMetadata(trackMeta map[string]any, title, source, trackID string, opts ripTrackOptions) tag.Metadata {
	artist := jsonutil.NestedString(trackMeta, "performer", "name")
	if artist == "" {
		artist = jsonutil.NestedString(trackMeta, "artist", "name")
	}
	albumArtist := jsonutil.NestedString(trackMeta, "album", "artist", "name")
	if albumArtist == "" {
		albumArtist = artist
	}
	if strings.TrimSpace(opts.albumArtist) != "" {
		albumArtist = strings.TrimSpace(opts.albumArtist)
	}
	trackNumber := jsonutil.IntFromAny(trackMeta["track_number"])
	if trackNumber == 0 {
		trackNumber = jsonutil.IntFromAny(trackMeta["trackNumber"])
	}
	discNumber := jsonutil.IntFromAny(trackMeta["media_number"])
	if discNumber == 0 {
		discNumber = jsonutil.IntFromAny(trackMeta["volumeNumber"])
	}
	if discNumber == 0 {
		discNumber = jsonutil.IntFromAny(trackMeta["disk_number"])
	}
	date := jsonutil.StringFromAny(trackMeta["release_date_original"])
	if date == "" {
		date = jsonutil.StringFromAny(trackMeta["release_date"])
	}
	if date == "" {
		date = jsonutil.StringFromAny(trackMeta["streamStartDate"])
	}
	album := jsonutil.NestedString(trackMeta, "album", "title")
	if album == "" {
		album = jsonutil.StringFromAny(trackMeta["title"])
	}
	trackTotal := jsonutil.IntFromAny(trackMeta["tracks_count"])
	if trackTotal == 0 {
		trackTotal = jsonutil.IntFromAny(trackMeta["numberOfTracks"])
	}
	if trackTotal == 0 {
		trackTotal = jsonutil.IntFromAny(trackMeta["track_total"])
	}
	if opts.forPlaylist && opts.total > 0 {
		trackTotal = opts.total
	}

	discTotal := jsonutil.IntFromAny(trackMeta["media_count"])
	if discTotal == 0 {
		discTotal = jsonutil.IntFromAny(trackMeta["numberOfVolumes"])
	}
	if !opts.forPlaylist && discTotal == 0 && opts.albumDiscTotal > 0 {
		discTotal = opts.albumDiscTotal
	}
	if opts.forPlaylist {
		discNumber = 0
		discTotal = 0
	}
	if !opts.forPlaylist && discNumber == 0 {
		discNumber = 1
	}

	genre := jsonutil.NestedString(trackMeta, "genre", "name")
	if genre == "" {
		genre = jsonutil.StringFromAny(trackMeta["genre"])
	}

	comment := jsonutil.StringFromAny(trackMeta["comment"])
	description := jsonutil.StringFromAny(trackMeta["description"])
	lyrics := jsonutil.StringFromAny(trackMeta["lyrics"])
	if lrc := jsonutil.StringFromAny(trackMeta["lyrics_synced"]); lrc != "" {
		lyrics = lrc
	}
	trackGain := replaygainGainFromAny(trackMeta["replaygain_track_gain"])
	if trackGain == "" {
		trackGain = replaygainGainFromAny(trackMeta["replayGain"])
	}
	if trackGain == "" {
		trackGain = replaygainGainFromAny(trackMeta["gain"])
	}
	albumGain := replaygainGainFromAny(trackMeta["replaygain_album_gain"])
	if albumGain == "" {
		albumGain = replaygainGainFromAny(jsonutil.NestedAny(trackMeta, "album", "replaygain_album_gain"))
	}
	trackPeak := replaygainPeakFromAny(trackMeta["replaygain_track_peak"])
	if trackPeak == "" {
		trackPeak = replaygainPeakFromAny(trackMeta["peak"])
	}
	albumPeak := replaygainPeakFromAny(trackMeta["replaygain_album_peak"])
	if albumPeak == "" {
		albumPeak = replaygainPeakFromAny(jsonutil.NestedAny(trackMeta, "album", "replaygain_album_peak"))
	}

	sourceAlbumID := jsonutil.NestedString(trackMeta, "album", "id")
	if sourceAlbumID == "" {
		sourceAlbumID = jsonutil.StringFromAny(trackMeta["source_album_id"])
	}
	sourceArtistID := jsonutil.NestedString(trackMeta, "artist", "id")
	if sourceArtistID == "" {
		sourceArtistID = jsonutil.NestedString(trackMeta, "performer", "id")
	}
	if sourceArtistID == "" {
		sourceArtistID = jsonutil.StringFromAny(trackMeta["source_artist_id"])
	}
	sourceTrackID := trackID
	if v := jsonutil.StringFromAny(trackMeta["source_track_id"]); v != "" {
		sourceTrackID = v
	}

	return tag.Metadata{
		Title:               title,
		Album:               album,
		Artist:              artist,
		AlbumArtist:         albumArtist,
		TrackNumber:         trackNumber,
		DiscNumber:          discNumber,
		TrackTotal:          trackTotal,
		DiscTotal:           discTotal,
		Date:                date,
		Genre:               genre,
		Comment:             comment,
		Description:         description,
		Lyrics:              lyrics,
		Copyright:           jsonutil.StringFromAny(trackMeta["copyright"]),
		ISRC:                jsonutil.StringFromAny(trackMeta["isrc"]),
		ReplaygainTrackGain: trackGain,
		ReplaygainAlbumGain: albumGain,
		ReplaygainTrackPeak: trackPeak,
		ReplaygainAlbumPeak: albumPeak,
		SourcePlatform:      source,
		SourceTrackID:       sourceTrackID,
		SourceAlbumID:       sourceAlbumID,
		SourceArtistID:      sourceArtistID,
	}
}

func applyPlaylistMetadataOverrides(meta map[string]any, cfg config.MetadataConfig, playlistName string, position int) {
	if cfg.RenumberPlaylistTracks && position > 0 {
		meta["track_number"] = position
		meta["trackNumber"] = position
	}
	if !cfg.SetPlaylistToAlbum {
		return
	}
	album, ok := meta["album"].(map[string]any)
	if !ok {
		album = map[string]any{}
		meta["album"] = album
	}
	album["title"] = playlistName
	artist, ok := album["artist"].(map[string]any)
	if !ok {
		artist = map[string]any{}
		album["artist"] = artist
	}
	artist["name"] = "Various Artists"
}

func isFFmpegMissingError(err error) bool {
	if err == nil {
		return false
	}
	if errors.Is(err, exec.ErrNotFound) {
		return true
	}
	return strings.Contains(strings.ToLower(err.Error()), "ffmpeg not found")
}