package web

import (
	"fmt"
	"strconv"
	"strings"
	"videoweb/app/service/authser"
	"videoweb/app/service/playletser"
	"videoweb/app/service/videoser"
	"videoweb/pub/common/log"
	"videoweb/pub/common/useragent"

	"github.com/gin-gonic/gin"
)

type favoriteWork struct {
	ID           int64
	Title        string
	Genre        string
	DesktopMeta  string
	Episodes     string
	Badge        string
	Image        string
	Kind         string
	URL          string
	DramaID      int64
	Episode      int
	VideoID      int64
	TotalEpisode int
}

// Favorites 我的收藏：短剧 / 剧集(视频) / 章节收藏。
// 文档：
// http://172.104.181.99:25319/swagger/index.html#/app短剧相关接口/get_api_app_playlet_collect_list
// http://172.104.181.99:25319/swagger/index.html#/视频相关接口/get_api_app_video_collect_list
func Favorites(c *gin.Context) {
	filter, page, validRoute := favoritesRoute(c)
	if !validRoute {
		NotFound(c)
		return
	}

	data := gin.H{"title": "我的收藏 - 黄果短剧", "navActive": "favorites", "accountTab": "favorites"}
	responses := gin.H{}
	loadAccountSummary(c, data, responses)

	status := 0
	switch filter {
	case "short", "chapter", "series":
	case "following":
		status = 1
	case "finished":
		status = 2
	default:
		filter = "all"
	}
	data["filter"] = filter

	pageSize := 12
	query := playletser.CollectListQuery{PageNum: page, PageSize: pageSize, WatchStatus: status}

	if useragent.TokenFromRequest(c.Request) == "" {
		responses["playlet/collect/list"] = gin.H{"error": "暂无登录会话"}
		responses["video/collect/list"] = gin.H{"error": "暂无登录会话"}
		data["favoritesResponse"] = responses["playlet/collect/list"]
		data["playletCollectResponse"] = responses["playlet/collect/list"]
		data["videoCollectResponse"] = responses["video/collect/list"]
		data["favoritesDebug"] = responses
		renderFavorites(c, data)
		return
	}

	if filter == "chapter" {
		list, code, err := playletser.FetchChapterCollectList(c, query)
		if retry, _ := authser.OnSessionExpired(c, code); retry {
			list, _, err = playletser.FetchChapterCollectList(c, query)
		}
		if err != nil {
			log.Error("fetch chapter favorites page failed", log.E(err))
			responses["playlet/chapter/collect/list"] = gin.H{"error": "加载失败", "msg": err.Error()}
			data["favoritesUnavailable"] = true
		} else if list != nil {
			responses["playlet/chapter/collect/list"] = gin.H{"code": 200, "data": list}
			data["paging"] = makeFavoritesPage(query.PageNum, query.PageSize, list.TotalCount, filter)
			data["favorites"] = chapterFavoriteWorks(list.List)
		} else {
			responses["playlet/chapter/collect/list"] = gin.H{"code": code, "data": list}
		}
		data["favoritesResponse"] = responses["playlet/chapter/collect/list"]
		data["playletCollectResponse"] = responses["playlet/chapter/collect/list"]
		data["favoritesDebug"] = responses
		renderFavorites(c, data)
		return
	}

	if filter == "series" {
		loadVideoFavorites(c, data, responses, page, pageSize)
		data["favoritesResponse"] = responses["video/collect/list"]
		data["playletCollectResponse"] = gin.H{}
		data["videoCollectResponse"] = responses["video/collect/list"]
		data["favoritesDebug"] = responses
		renderFavorites(c, data)
		return
	}

	var works []favoriteWork
	var totalCount int64
	playletFailed := false
	videoFailed := false

	if filter == "all" || filter == "short" || filter == "following" || filter == "finished" {
		list, code, err := playletser.FetchCollectList(c, query)
		if retry, _ := authser.OnSessionExpired(c, code); retry {
			list, code, err = playletser.FetchCollectList(c, query)
		}
		if err == nil && list != nil {
			responses["playlet/collect/list"] = gin.H{"code": 200, "data": list}
			works = append(works, playletFavoriteWorks(list.List)...)
			totalCount += list.TotalCount
		} else if err != nil {
			responses["playlet/collect/list"] = gin.H{"error": "加载失败", "msg": err.Error()}
			log.Error("fetch favorites page failed", log.E(err))
			playletFailed = true
		} else {
			responses["playlet/collect/list"] = gin.H{"code": code, "data": list}
		}
	}

	if filter == "all" {
		videoQuery := videoser.CollectListQuery{PageNum: page, PageSize: pageSize}
		videoList, videoCode, videoErr := videoser.FetchCollectList(c, videoQuery)
		if retry, _ := authser.OnSessionExpired(c, videoCode); retry {
			videoList, videoCode, videoErr = videoser.FetchCollectList(c, videoQuery)
		}
		if videoErr == nil && videoList != nil {
			responses["video/collect/list"] = gin.H{"code": 200, "data": videoList}
			works = append(works, videoFavoriteWorks(videoList.List)...)
			totalCount += videoList.TotalCount
		} else if videoErr != nil {
			responses["video/collect/list"] = gin.H{"error": "加载失败", "msg": videoErr.Error()}
			log.Error("fetch video favorites page failed", log.E(videoErr))
			videoFailed = true
		} else {
			responses["video/collect/list"] = gin.H{"code": videoCode, "data": videoList}
		}
	}

	if playletFailed && (filter != "all" || videoFailed) {
		data["favoritesUnavailable"] = true
	}
	if filter == "all" && playletFailed && videoFailed {
		data["favoritesUnavailable"] = true
	}

	data["paging"] = makeFavoritesPage(page, pageSize, totalCount, filter)
	data["favorites"] = works
	data["favoritesResponse"] = responses["playlet/collect/list"]
	data["playletCollectResponse"] = responses["playlet/collect/list"]
	data["videoCollectResponse"] = responses["video/collect/list"]
	data["favoritesDebug"] = responses
	renderFavorites(c, data)
}

// renderFavorites 收藏为空时附带「大家都在看」后渲染。
func renderFavorites(c *gin.Context, data gin.H) {
	attachFavoritesRecommended(c, data)
	HTMLOK(c, "favorites.html", data)
}

// attachFavoritesRecommended 列表为空时拉取最热短剧（与搜索无结果一致）。
// 上游：GET /api/app/playlet/all/list sortType=2
func attachFavoritesRecommended(c *gin.Context, data gin.H) {
	if works, ok := data["favorites"].([]favoriteWork); ok && len(works) > 0 {
		return
	}
	watchingQ := playletser.AllListQuery{
		PageNum:      1,
		PageSize:     6,
		SortType:     2, // 最热
		UpdateStatus: 0,
	}
	watching := playletser.FetchAllListOrEmpty(c, watchingQ)
	if watching == nil || len(watching.List) == 0 {
		return
	}
	list := watching.List
	if len(list) > 6 {
		list = list[:6]
	}
	data["recommended"] = list
}

func loadVideoFavorites(c *gin.Context, data gin.H, responses gin.H, page, pageSize int) {
	videoQuery := videoser.CollectListQuery{PageNum: page, PageSize: pageSize}
	list, code, err := videoser.FetchCollectList(c, videoQuery)
	if retry, _ := authser.OnSessionExpired(c, code); retry {
		list, code, err = videoser.FetchCollectList(c, videoQuery)
	}
	if err != nil {
		log.Error("fetch video favorites page failed", log.E(err))
		responses["video/collect/list"] = gin.H{"error": "加载失败", "msg": err.Error()}
		data["favoritesUnavailable"] = true
		return
	}
	if list == nil {
		responses["video/collect/list"] = gin.H{"code": code, "data": list}
		return
	}
	responses["video/collect/list"] = gin.H{"code": 200, "data": list}
	data["paging"] = makeFavoritesPage(page, pageSize, list.TotalCount, "series")
	data["favorites"] = videoFavoriteWorks(list.List)
}

func favoritesRoute(c *gin.Context) (filter string, page int, valid bool) {
	if c.Request.URL.Query().Has("filter") {
		return "", 0, false
	}
	filter = strings.TrimSpace(c.Param("filter"))
	switch filter {
	case "":
		filter = "all"
	case "short", "chapter", "series", "following", "finished":
	default:
		return "", 0, false
	}

	page, valid = accountPageNum(c)
	if !valid {
		return "", 0, false
	}
	return filter, page, true
}

func favoritesPagePath(filter string, page int) string {
	path := "/favorites"
	if filter != "" && filter != "all" {
		path += "/" + filter
	}
	if page > 1 {
		path += "/page/" + strconv.Itoa(page)
	}
	return path
}

func makeFavoritesPage(page, size int, count int64, filter string) accountPage {
	total := int((count + int64(size) - 1) / int64(size))
	pagination := accountPage{Current: page, Total: total, Count: count}
	if page > 1 {
		pagination.PrevURL = favoritesPagePath(filter, page-1)
	}
	if page < total {
		pagination.NextURL = favoritesPagePath(filter, page+1)
	}
	return pagination
}

func playletFavoriteWorks(items []playletser.PlayletCollectData) []favoriteWork {
	works := make([]favoriteWork, 0, len(items))
	for _, item := range items {
		title := strings.TrimSpace(item.PlayName)
		if title == "" {
			title = strings.TrimSpace(item.Title)
		}
		if title == "" {
			continue
		}
		work := favoriteWork{
			ID: item.ID, Title: title, Genre: strings.Join(item.ThemeNames, "  "),
			Image: profileCover(item.Cover), Kind: "short",
			URL:     playletser.ChapterPlayPath(item.Slug, item.ID, item.LastChapterID),
			DramaID: item.ID, Episode: item.LastEpisode, VideoID: item.LastChapterID,
			TotalEpisode: item.TotalEpisode,
		}
		if work.Episode <= 0 {
			work.Episode = 1
		}
		if item.TotalEpisode > 0 {
			work.Episodes = fmt.Sprintf("全 %d 集", item.TotalEpisode)
			work.DesktopMeta = work.Episodes
		}
		if item.IsFeatured {
			work.Badge = "爆剧"
		}
		works = append(works, work)
	}
	return works
}

func chapterFavoriteWorks(items []playletser.PlayletChapterCollectData) []favoriteWork {
	works := make([]favoriteWork, 0, len(items))
	for _, item := range items {
		title := strings.TrimSpace(item.PlayletTitle)
		if title == "" {
			continue
		}
		work := favoriteWork{
			ID: item.ChapterID, Title: title, Image: profileCover(item.PlayletCover), Kind: "chapter",
			URL: playletser.ChapterPlayPath(item.PlayletSlug, item.PlayletID, item.ChapterID), DesktopMeta: item.ChapterTitle,
			DramaID: item.PlayletID, Episode: item.CurrentEpisode, VideoID: item.ChapterID,
			TotalEpisode: item.TotalEpisode,
		}
		if work.Episode <= 0 {
			work.Episode = 1
		}
		if item.CurrentEpisode > 0 {
			work.Genre = fmt.Sprintf("第 %d 集", item.CurrentEpisode)
		}
		if item.TotalEpisode > 0 {
			work.Episodes = fmt.Sprintf("全 %d 集", item.TotalEpisode)
		}
		works = append(works, work)
	}
	return works
}

func videoFavoriteWorks(items []videoser.VideoCollectData) []favoriteWork {
	works := make([]favoriteWork, 0, len(items))
	for _, item := range items {
		title := strings.TrimSpace(item.Title)
		if title == "" {
			continue
		}
		work := favoriteWork{
			ID: item.ID, Title: title, Genre: strings.Join(item.Keyworld, "  "),
			Image: profileCover(item.CoverImg), Kind: "series",
			URL: videoser.VideoPlayURL(item.Slug, item.ID),
		}
		if item.VideoTime > 0 {
			work.Episodes = formatVideoDuration(item.VideoTime)
			work.DesktopMeta = work.Episodes
		} else {
			work.Episodes = "剧集"
			work.DesktopMeta = "剧集"
		}
		works = append(works, work)
	}
	return works
}