package service

import (
	"context"
	"crypto/sha256"
	"encoding/hex"
	"fmt"
	"os"
	"path/filepath"
	"strings"
	"sync"
	"time"

	"go.uber.org/zap"

	"github.com/truewhile/MeBox/internal/model"
)

// Item 单条目详情。
func (e *EmbyService) Item(ctx context.Context, mediaID, userID string) (map[string]any, error) {
	if e == nil {
		return nil, nil
	}
	// 远程 Emby 条目：不查本地库，直接向远程转发（保持远程最新元数据）。
	if e.remote != nil && IsEmbyRemoteID(mediaID) {
		mountID, remoteID, _ := DecodeEmbyRemoteID(mediaID)
		mount, acct, _ := e.remote.ResolveMount(ctx, mountID)
		if mount == nil || acct == nil {
			return nil, nil
		}
		if !EmbyMountLibraryAllowed(e.mediaVisibility(ctx, userID), mount) {
			return nil, nil
		}
		out, err := e.remote.RemoteItem(ctx, mount, acct, remoteID)
		if err != nil || out == nil {
			return out, err
		}
		if err := e.mergeRemoteUserData(ctx, userID, out); err != nil {
			return nil, err
		}
		if favorite, _ := IsUserFavorite(ctx, e.repo, userID, mediaID); favorite {
			userData, _ := out["UserData"].(map[string]any)
			if userData == nil {
				userData = map[string]any{}
				out["UserData"] = userData
			}
			userData["IsFavorite"] = true
		}
		return out, nil
	}
	if lib, err := e.repo.Library.FindByID(ctx, mediaID); err != nil {
		return nil, err
	} else if lib != nil {
		libs := FilterDisplayCloudLibraries(ctx, e.repo, []model.Library{*lib})
		if len(libs) == 0 {
			return nil, nil
		}
		visibility := e.mediaVisibility(ctx, userID)
		if !e.libraryVisibleFromCachedVisibility(libs[0], visibility) {
			return nil, nil
		}
		return e.libraryAsView(ctx, &libs[0]), nil
	}
	if strings.HasPrefix(mediaID, embyVirtualSeasonPrefix) {
		if season, ok, err := e.findSeasonGroup(ctx, mediaID, userID); err != nil {
			return nil, err
		} else if ok {
			item := e.seasonPayload(season)
			if media := seriesPeopleMedia(season.Series); media != nil {
				item["People"] = e.resolveMediaPeople(ctx, media)
			}
			return item, nil
		}
	}
	if strings.HasPrefix(mediaID, embyVirtualSeriesPrefix) {
		if series, ok, err := e.findSeriesGroup(ctx, mediaID, userID); err != nil {
			return nil, err
		} else if ok {
			item := e.seriesPayload(series)
			if media := seriesPeopleMedia(series); media != nil {
				item["People"] = e.resolveMediaPeople(ctx, media)
			}
			return item, nil
		}
	}
	m, err := e.repo.Media.FindByID(ctx, mediaID)
	if err != nil {
		return nil, err
	}
	if m == nil {
		if series, ok, err := e.findSeriesGroup(ctx, mediaID, userID); err != nil {
			return nil, err
		} else if ok {
			item := e.seriesPayload(series)
			if media := seriesPeopleMedia(series); media != nil {
				item["People"] = e.resolveMediaPeople(ctx, media)
			}
			return item, nil
		}
		return nil, nil
	}
	if !UserDefaultMediaVisibility(ctx, e.repo, userID).Allows(m) {
		return nil, nil
	}
	fav := false
	pos := int64(0)
	if userID != "" {
		var f model.Favorite
		ferr := e.repo.DB.WithContext(ctx).Where("user_id = ? AND media_id = ?", userID, mediaID).First(&f).Error
		if ferr == nil {
			fav = true
		}
		var h model.PlaybackHistory
		herr := e.repo.DB.WithContext(ctx).Where("user_id = ? AND media_id = ?", userID, mediaID).
			Order("watched_at desc").First(&h).Error
		if herr == nil {
			pos = h.PositionMs
		}
	}
	// 单条目 payload 内部对库类型/series 标题有多次查找，挂请求级缓存合并。
	return e.itemPayload(e.withPayloadCache(ctx), m, fav, pos, true), nil
}

// LatestItems 最近添加，全库或指定库。远程媒体库(parentID 带前缀)走远程并缓存。
func (e *EmbyService) LatestItems(ctx context.Context, userID, parentID string, limit int) ([]map[string]any, error) {
	if e == nil {
		return nil, nil
	}
	if limit <= 0 || limit > 100 {
		limit = 20
	}
	cacheKey := e.embyLatestCacheKey(userID, parentID, limit)
	if items, stale, ok := e.cachedLatestItemsWithStale(ctx, cacheKey); ok {
		if stale {
			e.refreshLatestItemsAsync(cacheKey, userID, parentID, limit)
		}
		return items, nil
	}
	value, err := e.loadLatestItemsCached(ctx, userID, parentID, limit)
	if err != nil {
		return nil, err
	}
	if value.Items == nil {
		return []map[string]any{}, nil
	}
	return value.Items, nil
}

func (e *EmbyService) loadLatestItemsCached(ctx context.Context, userID, parentID string, limit int) (embyLatestCacheValue, error) {
	cacheKey := e.embyLatestCacheKey(userID, parentID, limit)
	// 一个客户端断开不应取消正在为其他客户端填充的共享重建。
	loadCtx, cancel := context.WithTimeout(context.WithoutCancel(ctx), 45*time.Second)
	defer cancel()
	v, err, _ := e.latestFlight.Do(cacheKey, func() (any, error) {
		if items, ok := e.cachedLatestItems(loadCtx, cacheKey); ok {
			return embyLatestCacheValue{Items: items}, nil
		}
		value, err := e.loadLatestItems(loadCtx, userID, parentID, limit)
		if err != nil {
			return nil, err
		}
		if e.cache != nil {
			freshTTL := time.Duration(e.embyLatestCacheTTLSeconds()) * time.Second
			e.cache.SetJSONWithStale(loadCtx, cacheKey, value, freshTTL, freshTTL+30*time.Minute)
		}
		e.rememberArtworkRefs(value.Artwork)
		return value, nil
	})
	if err != nil {
		return embyLatestCacheValue{}, err
	}
	cached, _ := v.(embyLatestCacheValue)
	return cached, nil
}

func (e *EmbyService) refreshLatestItemsAsync(cacheKey, userID, parentID string, limit int) {
	if e == nil || e.cache == nil {
		return
	}
	if _, loaded := e.latestRefresh.LoadOrStore(cacheKey, struct{}{}); loaded {
		return
	}
	go func() {
		defer e.latestRefresh.Delete(cacheKey)
		if _, err := e.loadLatestItemsCached(context.Background(), userID, parentID, limit); err != nil && e.log != nil {
			e.log.Debug("background refresh of latest items failed",
				zap.String("parent_id", parentID),
				zap.Error(redactSensitiveError(err)))
		}
	}()
}

func (e *EmbyService) cachedLatestItems(ctx context.Context, cacheKey string) ([]map[string]any, bool) {
	items, stale, ok := e.cachedLatestItemsWithStale(ctx, cacheKey)
	return items, ok && !stale
}

func (e *EmbyService) cachedLatestItemsWithStale(ctx context.Context, cacheKey string) ([]map[string]any, bool, bool) {
	if e == nil || e.cache == nil {
		return nil, false, false
	}
	var cached embyLatestCacheValue
	found, stale := e.cache.GetJSONStale(ctx, cacheKey, &cached)
	if !found {
		return nil, false, false
	}
	e.rememberArtworkRefs(cached.Artwork)
	if cached.Items == nil {
		return []map[string]any{}, stale, true
	}
	return cached.Items, stale, true
}

func (e *EmbyService) loadLatestItems(ctx context.Context, userID, parentID string, limit int) (embyLatestCacheValue, error) {
	if e.remote != nil && IsEmbyRemoteID(parentID) {
		mountID, remoteParent, _ := DecodeEmbyRemoteID(parentID)
		mount, acct, _ := e.remote.ResolveMount(ctx, mountID)
		if mount == nil || acct == nil || !EmbyMountLibraryAllowed(e.mediaVisibility(ctx, userID), mount) {
			return embyLatestCacheValue{Items: []map[string]any{}}, nil
		}
		out, err := e.remote.RemoteLatest(ctx, mount, acct, remoteParent, limit)
		if err != nil {
			return embyLatestCacheValue{}, err
		}
		if out == nil {
			out = []map[string]any{}
		}
		if err := e.mergeRemoteUserData(ctx, userID, out); err != nil {
			return embyLatestCacheValue{}, err
		}
		return embyLatestCacheValue{Items: out}, nil
	}
	q := e.repo.DB.WithContext(ctx).Model(&model.Media{}).Where("deleted_at IS NULL")
	q = e.applyUserMediaVisibility(ctx, q, userID)
	if parentID != "" {
		if episodic, err := e.libraryIsEpisodic(ctx, parentID); err == nil && episodic {
			out, artwork, err := e.latestSeriesItemsForLibrary(ctx, userID, parentID, limit)
			if err != nil {
				return embyLatestCacheValue{}, err
			}
			return embyLatestCacheValue{Items: out, Artwork: artwork}, nil
		}
		q = q.Where("library_id IN ?", e.mergedLibraryIDs(ctx, parentID))
	}
	rowLimit := limit * 4
	if rowLimit < 100 {
		rowLimit = 100
	}
	if rowLimit > 500 {
		rowLimit = 500
	}
	var rows []model.Media
	if err := q.Order(mediaReleaseOrderSQL(true)).Limit(rowLimit).Find(&rows).Error; err != nil {
		return embyLatestCacheValue{}, err
	}
	rows = e.collapseMediaVersionRows(ctx, rows)
	if len(rows) > limit {
		rows = rows[:limit]
	}
	out, err := e.payloadsForMedia(ctx, rows, userID)
	if err != nil {
		return embyLatestCacheValue{}, err
	}
	return embyLatestCacheValue{Items: out}, nil
}

func (e *EmbyService) latestSeriesItemsForLibrary(ctx context.Context, userID, libraryID string, limit int) ([]map[string]any, map[string]embyArtworkRef, error) {
	if limit <= 0 || limit > 100 {
		limit = 20
	}
	q := e.repo.DB.WithContext(ctx).Model(&model.Media{}).
		Where("library_id IN ? AND (season_num > 0 OR episode_num > 0)", e.mergedLibraryIDs(ctx, libraryID))
	q = e.applyUserMediaVisibility(ctx, q, userID)
	var rows []model.Media
	// 只要最近几部剧的卡片，不要把整库 5 万行拉进内存再丢掉。
	if err := q.Order(mediaReleaseOrderSQL(true)).Limit(embyLatestSeriesRowLimit(limit)).Find(&rows).Error; err != nil {
		return nil, nil, err
	}
	groups := e.seriesGroupsFromMedia(ctx, rows)
	sortSeriesGroups(groups, ItemsParams{SortBy: "premieredate", SortOrder: "Descending"})
	if len(groups) > limit {
		groups = groups[:limit]
	}
	items := make([]map[string]any, 0, len(groups))
	for _, group := range groups {
		items = append(items, e.seriesPayload(group))
	}
	return items, e.artworkRefsForSeriesGroups(groups), nil
}

// embyLatestSeriesRowLimit 是 Latest 剧集卡片的候选窗口。按「每部剧最近约 40
// 集」估，刚好覆盖现有 25 部 × 40 集的分组测试，又不会为了 16 张海报去扫整库。
// ponytail: 一部长剧如果占满窗口，更老的剧不会出现在 Latest 行；点进媒体库
// 仍走完整分组。上限 2000 行。
func embyLatestSeriesRowLimit(limit int) int {
	if limit < 1 {
		limit = 20
	}
	n := limit * 40
	if n < 200 {
		n = 200
	}
	if n > 2000 {
		n = 2000
	}
	return n
}

// ResumeItems 列出有未完成播放进度的媒体。
func (e *EmbyService) ResumeItems(ctx context.Context, userID string, limit int) (map[string]any, error) {
	return e.resumableItems(ctx, ItemsParams{UserID: userID, Limit: limit})
}

// favoriteItems returns favourited media for Emby clients, including mounted
// remote items stored only in the local favourites table.
func (e *EmbyService) favoriteItems(ctx context.Context, p ItemsParams) (map[string]any, error) {
	if p.Limit <= 0 || p.Limit > 500 {
		p.Limit = 50
	}
	if p.StartIndex < 0 {
		p.StartIndex = 0
	}
	if strings.TrimSpace(p.UserID) == "" {
		return map[string]any{"Items": []any{}, "TotalRecordCount": int64(0), "StartIndex": p.StartIndex}, nil
	}

	var favs []model.Favorite
	if err := e.repo.DB.WithContext(ctx).
		Where("user_id = ?", p.UserID).
		Order("created_at desc").
		Find(&favs).Error; err != nil {
		return nil, err
	}
	if len(favs) == 0 {
		return map[string]any{"Items": []any{}, "TotalRecordCount": int64(0), "StartIndex": p.StartIndex}, nil
	}

	localIDs := make([]string, 0, len(favs))
	for _, fav := range favs {
		if !IsEmbyRemoteID(fav.MediaID) {
			localIDs = append(localIDs, fav.MediaID)
		}
	}
	byID := map[string]*model.Media{}
	if len(localIDs) > 0 {
		var medias []model.Media
		q := e.repo.DB.WithContext(ctx).Where("id IN ?", localIDs)
		q = e.applyUserMediaVisibility(ctx, q, p.UserID)
		if err := q.Find(&medias).Error; err != nil {
			return nil, err
		}
		for i := range medias {
			byID[medias[i].ID] = &medias[i]
		}
	}

	items := make([]map[string]any, 0, len(favs))
	for _, fav := range favs {
		if m, ok := byID[fav.MediaID]; ok {
			if !favoriteMatchesParent(ctx, e, p.ParentID, fav.MediaID, m.LibraryID, m.SeriesID, nil) {
				continue
			}
			if p.SearchTerm != "" {
				needle := strings.ToLower(p.SearchTerm)
				if !strings.Contains(strings.ToLower(m.Title), needle) &&
					!strings.Contains(strings.ToLower(m.OriginalName), needle) {
					continue
				}
			}
			items = append(items, e.itemPayload(ctx, m, true, 0, false))
			continue
		}
		if e.remote == nil || !IsEmbyRemoteID(fav.MediaID) {
			continue
		}
		mountID, remoteID, _ := DecodeEmbyRemoteID(fav.MediaID)
		mount, acct, err := e.remote.ResolveMount(ctx, mountID)
		if err != nil || mount == nil || acct == nil {
			continue
		}
		item, err := e.remote.RemoteItem(ctx, mount, acct, remoteID)
		if err != nil || item == nil {
			continue
		}
		if !favoriteMatchesParent(ctx, e, p.ParentID, fav.MediaID, "", "", item) {
			continue
		}
		if p.SearchTerm != "" {
			needle := strings.ToLower(p.SearchTerm)
			name, _ := item["Name"].(string)
			orig, _ := item["OriginalTitle"].(string)
			if !strings.Contains(strings.ToLower(name), needle) &&
				!strings.Contains(strings.ToLower(orig), needle) {
				continue
			}
		}
		userData, _ := item["UserData"].(map[string]any)
		if userData == nil {
			userData = map[string]any{}
			item["UserData"] = userData
		}
		userData["IsFavorite"] = true
		items = append(items, item)
	}

	total := int64(len(items))
	if p.StartIndex >= len(items) {
		return map[string]any{"Items": []map[string]any{}, "TotalRecordCount": total, "StartIndex": p.StartIndex}, nil
	}
	end := minInt(p.StartIndex+p.Limit, len(items))
	return map[string]any{"Items": items[p.StartIndex:end], "TotalRecordCount": total, "StartIndex": p.StartIndex}, nil
}

func favoriteMatchesParent(ctx context.Context, e *EmbyService, parentID, mediaID, libraryID, seriesID string, remoteItem map[string]any) bool {
	if parentID == "" {
		return true
	}
	if libraryID != "" {
		if libraryID == parentID || seriesID == parentID {
			return true
		}
		for _, id := range e.mergedLibraryIDs(ctx, parentID) {
			if id == libraryID {
				return true
			}
		}
		return false
	}
	if remoteItem == nil {
		return false
	}
	itemParent, _ := remoteItem["ParentId"].(string)
	itemSeries, _ := remoteItem["SeriesId"].(string)
	if itemParent == parentID || itemSeries == parentID || mediaID == parentID {
		return true
	}
	if !IsEmbyRemoteID(parentID) {
		return false
	}
	wantMountID, _, _ := DecodeEmbyRemoteID(parentID)
	gotMountID, _, _ := DecodeEmbyRemoteID(mediaID)
	return wantMountID != "" && gotMountID == wantMountID
}

// resumableItems 返回未完成播放进度的媒体（包含本地媒体与挂载的远程媒体），支持分页。
func (e *EmbyService) resumableItems(ctx context.Context, p ItemsParams) (map[string]any, error) {
	if p.Limit <= 0 || p.Limit > 100 {
		p.Limit = 50
	}
	if p.StartIndex < 0 {
		p.StartIndex = 0
	}
	if strings.TrimSpace(p.UserID) == "" {
		return map[string]any{"Items": []any{}, "TotalRecordCount": int64(0), "StartIndex": p.StartIndex}, nil
	}

	// 历史记录限行：此前无上限全量加载，远程条目多时既拖慢 SQL 也放大
	// 下面的远程详情请求量。
	var hist []model.PlaybackHistory
	if err := e.repo.DB.WithContext(ctx).
		Where("user_id = ? AND completed = ? AND position_ms > 0", p.UserID, false).
		Order("watched_at desc").Limit(200).Find(&hist).Error; err != nil {
		return nil, err
	}
	if len(hist) == 0 {
		return map[string]any{"Items": []any{}, "TotalRecordCount": int64(0), "StartIndex": p.StartIndex}, nil
	}

	localIDs := make([]string, 0, len(hist))
	for _, h := range hist {
		if !IsEmbyRemoteID(h.MediaID) {
			localIDs = append(localIDs, h.MediaID)
		}
	}
	byID := map[string]*model.Media{}
	if len(localIDs) > 0 {
		var medias []model.Media
		q := e.repo.DB.WithContext(ctx).Where("id IN ?", localIDs)
		q = e.applyUserMediaVisibility(ctx, q, p.UserID)
		if err := q.Find(&medias).Error; err != nil {
			return nil, err
		}
		for i := range medias {
			byID[medias[i].ID] = &medias[i]
		}
	}

	// 分页前置：凑满 StartIndex+Limit 条即停，不再为「总数」逐条发远程
	// 详情 GET（此前每条远程记录一次串行 GET，远程慢时请求挂起数分钟）。
	// 总数用候选行数（本地过滤后 + 远程候选），对继续观看行的翻页语义
	// 足够准确。
	needed := p.StartIndex + p.Limit
	slots := make([]resumeSlot, 0, len(hist))
	localTotal, remoteTotal := 0, 0
	for _, h := range hist {
		if m, ok := byID[h.MediaID]; ok {
			if p.ParentID != "" && m.LibraryID != p.ParentID && m.SeriesID != p.ParentID {
				continue
			}
			localTotal++
			slots = append(slots, resumeSlot{item: e.itemPayload(ctx, m, false, h.PositionMs, false)})
			continue
		}
		if e.remote == nil || !IsEmbyRemoteID(h.MediaID) {
			continue
		}
		remoteTotal++
		slots = append(slots, resumeSlot{fetch: &resumeRemoteFetch{hist: h}})
	}
	for {
		filled := 0
		pending := make([]*resumeRemoteFetch, 0)
		for i := range slots {
			if slots[i].item != nil {
				filled++
				if filled >= needed {
					break
				}
				continue
			}
			f := slots[i].fetch
			if f == nil || f.done {
				continue
			}
			if f.mount == nil {
				mountID, remoteID, _ := DecodeEmbyRemoteID(f.hist.MediaID)
				mount, acct, err := e.remote.ResolveMount(ctx, mountID)
				if err != nil || mount == nil || acct == nil {
					f.done = true
					continue
				}
				f.mount, f.acct, f.remoteID = mount, acct, remoteID
			}
			pending = append(pending, f)
			if filled+len(pending) >= needed {
				break
			}
		}
		if len(pending) == 0 {
			break
		}
		e.fillResumeRemotes(ctx, pending)
		for i := range slots {
			f := slots[i].fetch
			if f == nil || !pendingContains(pending, f) {
				continue
			}
			f.done = true
			item := f.item
			f.item = nil
			if item == nil {
				continue
			}
			if p.ParentID != "" {
				parentID, _ := item["ParentId"].(string)
				seriesID, _ := item["SeriesId"].(string)
				mountID, _, _ := DecodeEmbyRemoteID(f.hist.MediaID)
				if parentID != p.ParentID && seriesID != p.ParentID && mountID != p.ParentID {
					continue
				}
			}
			item["UserData"] = mergedRemoteUserData(item["UserData"], &f.hist)
			slots[i].item = item
		}
	}
	items := make([]map[string]any, 0, p.Limit)
	for i := range slots {
		if slots[i].item == nil {
			continue
		}
		items = append(items, slots[i].item)
	}

	total := int64(localTotal + remoteTotal)
	if p.StartIndex >= len(items) {
		return map[string]any{"Items": []map[string]any{}, "TotalRecordCount": total, "StartIndex": p.StartIndex}, nil
	}
	end := minInt(p.StartIndex+p.Limit, len(items))
	return map[string]any{"Items": items[p.StartIndex:end], "TotalRecordCount": total, "StartIndex": p.StartIndex}, nil
}

type resumeSlot struct {
	item  map[string]any
	fetch *resumeRemoteFetch
}

type resumeRemoteFetch struct {
	hist     model.PlaybackHistory
	mount    *model.EmbyMount
	acct     *model.StrmAccount
	remoteID string
	item     map[string]any
	done     bool
}

func pendingContains(rows []*resumeRemoteFetch, target *resumeRemoteFetch) bool {
	for _, row := range rows {
		if row == target {
			return true
		}
	}
	return false
}

// fillResumeRemotes 并行补齐继续观看里的远程条目。同一页以前是串行 GET，
// 远程一慢就把整个 Resume 拖到数秒。结果按原播放历史顺序回填。
func (e *EmbyService) fillResumeRemotes(ctx context.Context, rows []*resumeRemoteFetch) {
	if e == nil || e.remote == nil || len(rows) == 0 {
		return
	}
	var wg sync.WaitGroup
	sem := make(chan struct{}, 4)
	for i := range rows {
		wg.Add(1)
		go func(i int) {
			defer wg.Done()
			select {
			case sem <- struct{}{}:
			case <-ctx.Done():
				return
			}
			defer func() { <-sem }()
			item, err := e.remote.RemoteItem(ctx, rows[i].mount, rows[i].acct, rows[i].remoteID)
			if err != nil || item == nil {
				return
			}
			rows[i].item = item
		}(i)
	}
	wg.Wait()
}

func (e *EmbyService) itemPayload(ctx context.Context, m *model.Media, fav bool, posMs int64, includePeople bool) map[string]any {
	itemType := "Movie"
	name := m.Title
	parentID := m.LibraryID
	seriesID := m.SeriesID
	seriesName := ""
	seasonID := ""
	seasonNum := m.SeasonNum
	if e.mediaShouldBeEpisode(ctx, m) {
		itemType = "Episode"
		seriesID = e.seriesIDForMedia(ctx, m)
		seriesName = e.seriesNameForMedia(ctx, m)
		seasonNum = embySeasonNumForMedia(m)
		seasonID = e.seasonIDForMedia(ctx, m)
		parentID = seasonID
		episodeTitle := strings.TrimSpace(m.EpisodeTitle)
		if episodeTitle != "" {
			name = episodeTitle
		} else if m.EpisodeNum > 0 {
			name = fmt.Sprintf("第 %d 集", m.EpisodeNum)
		}
	}
	imageTags := map[string]string{}
	backdropTags := []string{}
	primaryArtwork := e.mediaPrimaryArtwork(ctx, m)
	backdropArtwork := e.mediaBackdropArtwork(ctx, m)
	if primaryArtwork != "" {
		imageTags["Primary"] = m.ID
	}
	if backdropArtwork != "" {
		backdropTags = append(backdropTags, m.ID+"-bd")
	}

	runTimeTicks := int64(m.DurationSec) * 10_000_000
	durationMs := int64(m.DurationSec) * 1000
	if durationMs <= 0 && posMs > 0 {
		durationMs = posMs * 2
		if durationMs < 30*60*1000 {
			durationMs = 30 * 60 * 1000
		}
		runTimeTicks = durationMs * 10_000
	}
	played := posMs > 0 && durationMs > 0 && posMs >= durationMs*9/10
	pct := 0.0
	if durationMs > 0 {
		pct = float64(posMs) / float64(durationMs) * 100
	}

	item := map[string]any{
		"Id":                m.ID,
		"Name":              name,
		"OriginalTitle":     m.OriginalName,
		"ServerId":          embyServerID,
		"Type":              itemType,
		"MediaType":         "Video",
		"IsFolder":          false,
		"ProductionYear":    m.Year,
		"ParentIndexNumber": seasonNum,
		"IndexNumber":       m.EpisodeNum,
		"Overview":          m.Overview,
		"RunTimeTicks":      runTimeTicks,
		"CommunityRating":   m.Rating,
		"Container":         m.Container,
		"Width":             m.Width,
		"Height":            m.Height,
		"DateCreated":       m.CreatedAt,
		"Path":              m.Path,
		"ParentId":          parentID,
		"SeasonId":          seasonID,
		"SeasonName":        seasonName(seasonNum),
		"SeriesId":          seriesID,
		"SeriesName":        seriesName,
		"ImageTags":         imageTags,
		"BackdropImageTags": backdropTags,
		"Genres":            splitCSV(m.Genres),
		"People":            []map[string]any{},
		"ProviderIds": map[string]string{
			"Tmdb":    intToStr(m.TMDbID),
			"Bangumi": intToStr(m.BangumiID),
		},
		"UserData": map[string]any{
			"PlaybackPositionTicks": posMs * 10_000,
			"PlayCount":             0,
			"IsFavorite":            fav,
			"Played":                played,
			"PlayedPercentage":      pct,
		},
		"MediaSources": e.mediaSourcesForItem(ctx, m, true, false),
	}
	if primaryArtwork != "" {
		item["PrimaryImageTag"] = m.ID
	}
	if seriesID != "" {
		if sEntry, ok, _ := e.payloadSeriesEntry(ctx, seriesID); ok {
			if sEntry.posterURL != "" {
				item["SeriesPrimaryImageTag"] = embyVirtualImageTag(seriesID, embyVirtualPrimaryTagSuffix)
			}
			if len(backdropTags) == 0 && (sEntry.backdropURL != "" || sEntry.posterURL != "") {
				item["ParentBackdropItemId"] = seriesID
				item["ParentBackdropImageTags"] = []string{embyVirtualImageTag(seriesID, embyVirtualBackdropTagSuffix)}
			}
		}
	}
	if premiered, ok := embyPremiereDate(m.ReleaseDate); ok {
		item["PremiereDate"] = premiered
	}
	if includePeople {
		item["People"] = e.resolveMediaPeople(ctx, m)
	}
	return item
}

func (e *EmbyService) resolveMediaPeople(ctx context.Context, m *model.Media) []map[string]any {
	if m == nil {
		return []map[string]any{}
	}
	cacheKey := embyMediaPeopleCacheKey(m)
	if cacheKey == "" {
		return []map[string]any{}
	}
	if people, ok := e.cachedMediaPeople(cacheKey); ok {
		return people
	}
	people := e.fetchTMDbPeople(ctx, m)
	if len(people) == 0 {
		people = e.resolveNFOMediaPeople(m)
	}
	e.rememberMediaPeople(cacheKey, people)
	return people
}

func seriesPeopleMedia(group embySeriesGroup) *model.Media {
	if group.TMDbID <= 0 {
		return nil
	}
	if len(group.Episodes) > 0 {
		media := group.Episodes[0]
		media.TMDbID = group.TMDbID
		return &media
	}
	return &model.Media{Title: group.Name, TMDbID: group.TMDbID, SeasonNum: 1}
}

func (e *EmbyService) fetchTMDbPeople(ctx context.Context, m *model.Media) []map[string]any {
	if e == nil || m == nil {
		return nil
	}
	var people []map[string]any
	if e.tmdb != nil && m.TMDbID > 0 {
		mediaType := "movie"
		if m.SeasonNum > 0 || m.EpisodeNum > 0 {
			mediaType = "tv"
		}
		people, err := e.tmdb.GetPeople(ctx, m.TMDbID, mediaType)
		if err != nil {
			if e.log != nil {
				e.log.Debug("tmdb: detail people lookup failed", zap.Int("tmdb_id", m.TMDbID), zap.String("type", mediaType), zap.Error(err))
			}
		} else if len(people) > 0 {
			e.rememberPersonImages(people)
			return people
		}
	}
	if m.NSFW && e.adult != nil {
		people = e.adult.GetPeople(ctx, m)
	}
	return people
}

func embyMediaPeopleCacheKey(m *model.Media) string {
	if m == nil {
		return ""
	}
	if m.TMDbID > 0 {
		mediaType := "movie"
		if m.SeasonNum > 0 || m.EpisodeNum > 0 {
			mediaType = "tv"
		}
		return fmt.Sprintf("tmdb:%d:%s", m.TMDbID, mediaType)
	}
	if strings.TrimSpace(m.ID) != "" {
		return "media:" + strings.TrimSpace(m.ID)
	}
	if strings.TrimSpace(m.Path) != "" {
		return "path:" + strings.ToLower(filepath.Clean(m.Path))
	}
	return ""
}

func (e *EmbyService) resolveNFOMediaPeople(m *model.Media) []map[string]any {
	if m == nil || strings.TrimSpace(m.Path) == "" {
		return []map[string]any{}
	}
	dir := filepath.Dir(m.Path)
	candidates := make([]string, 0, 6)
	seenPath := map[string]struct{}{}
	add := func(path string) {
		path = strings.TrimSpace(path)
		if path == "" {
			return
		}
		key := strings.ToLower(filepath.Clean(path))
		if _, ok := seenPath[key]; ok {
			return
		}
		seenPath[key] = struct{}{}
		candidates = append(candidates, path)
	}
	// 共享词干优先（竞女01.mkv.strm → 竞女01.nfo），并兼容旧的单层剥扩展命名。
	add(nfoPath(m.Path))
	for _, base := range mediaSidecarBaseVariants(m.Path) {
		add(filepath.Join(dir, base+".nfo"))
	}
	add(filepath.Join(dir, "movie.nfo"))
	add(filepath.Join(dir, "tvshow.nfo"))

	people := make([]map[string]any, 0)
	seen := make(map[string]bool)
	for _, p := range candidates {
		if fi, err := os.Stat(p); err == nil && !fi.IsDir() {
			doc, _, err := decodeNFOFile(p)
			if err == nil && doc != nil {
				for _, d := range doc.Directors {
					name := strings.TrimSpace(d)
					if name == "" {
						continue
					}
					personID := embyPersonID(name, "Director")
					if seen[personID] {
						continue
					}
					seen[personID] = true
					people = append(people, map[string]any{
						"Id":   personID,
						"Name": name,
						"Type": "Director",
						"Role": "Director",
					})
				}
				for _, a := range doc.Actors {
					name := strings.TrimSpace(a.Name)
					if name == "" {
						continue
					}
					personID := embyPersonID(name, "Actor")
					if seen[personID] {
						continue
					}
					seen[personID] = true
					role := strings.TrimSpace(a.Role)
					if role == "" {
						role = "Actor"
					}
					people = append(people, map[string]any{
						"Id":   personID,
						"Name": name,
						"Type": "Actor",
						"Role": role,
					})
				}
				break
			}
		}
	}
	return people
}

func (e *EmbyService) cachedMediaPeople(key string) ([]map[string]any, bool) {
	if e == nil || strings.TrimSpace(key) == "" {
		return nil, false
	}
	now := time.Now()
	e.peopleMu.RLock()
	entry, ok := e.peopleCache[key]
	e.peopleMu.RUnlock()
	if !ok || now.After(entry.expiresAt) {
		if ok {
			e.peopleMu.Lock()
			delete(e.peopleCache, key)
			e.peopleMu.Unlock()
		}
		return nil, false
	}
	out := make([]map[string]any, len(entry.people))
	copy(out, entry.people)
	return out, true
}

func (e *EmbyService) rememberMediaPeople(key string, people []map[string]any) {
	if e == nil || strings.TrimSpace(key) == "" {
		return
	}
	e.peopleMu.Lock()
	defer e.peopleMu.Unlock()
	if e.peopleCache == nil || len(e.peopleCache) > 8000 {
		e.peopleCache = make(map[string]embyPeopleCacheEntry, 128)
	}
	stored := make([]map[string]any, len(people))
	copy(stored, people)
	ttl := embyPeopleCacheTTL
	if len(stored) == 0 {
		ttl = embyPeopleEmptyCacheTTL
	}
	e.peopleCache[key] = embyPeopleCacheEntry{
		people:    stored,
		expiresAt: time.Now().Add(ttl),
	}
}

func (e *EmbyService) rememberPersonImages(people []map[string]any) {
	if e == nil || len(people) == 0 {
		return
	}
	e.personImageMu.Lock()
	defer e.personImageMu.Unlock()
	if e.personImages == nil || len(e.personImages) > 20000 {
		e.personImages = make(map[string]string, 128)
	}
	for _, person := range people {
		id := strings.TrimSpace(fmt.Sprint(person["Id"]))
		profilePath := tmdbProfilePathFromTag(fmt.Sprint(person["PrimaryImageTag"]))
		if _, ok := parseTMDbPersonID(id); ok && profilePath != "" {
			e.personImages[id] = profilePath
		}
	}
}

func (e *EmbyService) cachedPersonImage(id string) string {
	if e == nil {
		return ""
	}
	e.personImageMu.RLock()
	profilePath := e.personImages[strings.TrimSpace(id)]
	e.personImageMu.RUnlock()
	return profilePath
}

func (e *EmbyService) rememberPersonImage(id, profilePath string) {
	profilePath = strings.TrimSpace(profilePath)
	if e == nil || strings.TrimSpace(id) == "" || !tmdbProfilePathRE.MatchString(profilePath) {
		return
	}
	e.personImageMu.Lock()
	if e.personImages == nil {
		e.personImages = make(map[string]string, 128)
	}
	e.personImages[strings.TrimSpace(id)] = profilePath
	e.personImageMu.Unlock()
}

func embyPersonID(name, roleType string) string {
	sum := sha256.Sum256([]byte(strings.ToLower(strings.TrimSpace(name)) + ":" + strings.ToLower(strings.TrimSpace(roleType))))
	return "person-" + hex.EncodeToString(sum[:8])
}