package playletser

import (
	"fmt"
	"net/url"
	"strconv"
	"strings"
	"videoweb/app/service/authser"
	"videoweb/app/service/upstream"
	"videoweb/pub/common/log"

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

const (
	chapterDetailPath = "/api/app/playlet/chapter/detail"
	chapterListPath   = "/api/app/playlet/chapter/list"
)

// PlayQuery 播放页参数。
type PlayQuery struct {
	PlayletID   int64
	PlayletSlug string
	ChapterID   int64
}

// ParsePlayQuery 解析播放页的路径参数。
func ParsePlayQuery(playletKey, chapterIDRaw string) PlayQuery {
	q := PlayQuery{PlayletSlug: strings.TrimSpace(playletKey)}
	if n, err := strconv.ParseInt(strings.TrimSpace(playletKey), 10, 64); err == nil && n > 0 {
		q.PlayletID = n
		q.PlayletSlug = ""
	}
	if n, err := strconv.ParseInt(strings.TrimSpace(chapterIDRaw), 10, 64); err == nil && n > 0 {
		q.ChapterID = n
	}
	return q
}

// FetchChapterDetail 查询剧集播放详情。
func FetchChapterDetail(c *gin.Context, chapterID, playletID int64, playletSlug string) (*PlayletChapterInfoResp, error) {
	if chapterID <= 0 {
		return nil, fmt.Errorf("chapter detail invalid chapterId")
	}
	params := url.Values{}
	params.Set("chapterId", strconv.FormatInt(chapterID, 10))
	if playletSlug = strings.TrimSpace(playletSlug); playletSlug != "" {
		params.Set("playletSlug", playletSlug)
	} else if playletID > 0 {
		params.Set("playletId", strconv.FormatInt(playletID, 10))
	}
	authser.EnsureGuestOnEnter(c)
	var env APIEnvelope[PlayletChapterInfoResp]
	if err := upstream.GetJSON(c, chapterDetailPath+"?"+params.Encode(), &env); err != nil {
		return nil, err
	}
	if env.Code != 200 && authser.IsSessionExpiredCode(env.Code) {
		if authser.RecoverContentSession(c, env.Code) {
			if err := upstream.GetJSON(c, chapterDetailPath+"?"+params.Encode(), &env); err != nil {
				return nil, err
			}
		}
	}
	if env.Code != 200 {
		return nil, fmt.Errorf("chapter detail code=%d msg=%s tip=%s", env.Code, env.Msg, env.Tip)
	}
	env.Data.SeoInfo.Normalize()
	return &env.Data, nil
}

// FetchChapterDetailOrNil 失败返回 nil。
func FetchChapterDetailOrNil(c *gin.Context, chapterID, playletID int64, playletSlug string) *PlayletChapterInfoResp {
	data, err := FetchChapterDetail(c, chapterID, playletID, playletSlug)
	if err != nil {
		log.Error("fetch chapter detail failed", log.E(err))
		return nil
	}
	if data == nil || data.ID <= 0 {
		return nil
	}
	return data
}

// FetchChapterList 根据短剧 slug 或 ID 查询选集列表，slug 优先。
func FetchChapterList(c *gin.Context, playletID int64, playletSlug string) (*PlayletChapterListResp, error) {
	params := url.Values{}
	if playletSlug = strings.TrimSpace(playletSlug); playletSlug != "" {
		params.Set("playletSlug", playletSlug)
	} else if playletID > 0 {
		params.Set("playletId", strconv.FormatInt(playletID, 10))
	} else {
		return nil, fmt.Errorf("chapter list missing playletSlug or playletId")
	}
	authser.EnsureGuestOnEnter(c)
	var env APIEnvelope[PlayletChapterListResp]
	if err := upstream.GetJSON(c, chapterListPath+"?"+params.Encode(), &env); err != nil {
		return nil, err
	}
	if env.Code != 200 && authser.IsSessionExpiredCode(env.Code) {
		if authser.RecoverContentSession(c, env.Code) {
			if err := upstream.GetJSON(c, chapterListPath+"?"+params.Encode(), &env); err != nil {
				return nil, err
			}
		}
	}
	if env.Code != 200 {
		return nil, fmt.Errorf("playlet chapter list code=%d msg=%s tip=%s", env.Code, env.Msg, env.Tip)
	}
	return &env.Data, nil
}

// ResolvePlayChapterID 无 chapterId 时取短剧第一章。
func ResolvePlayChapterID(playlet *PlayletInfoResp, chapterID int64) int64 {
	if chapterID > 0 {
		return chapterID
	}
	if playlet == nil {
		return 0
	}
	for _, ch := range playlet.PlayletChapterInfo {
		if ch.ID > 0 {
			return ch.ID
		}
	}
	return 0
}

// AllowWatch 是否可播放（优先 canWatch；兼容仅返回 videoUrl 的旧数据）。
func (c *PlayletChapterInfoResp) AllowWatch() bool {
	if c == nil {
		return false
	}
	if c.CanWatch {
		return true
	}
	if c.NeedUnlock || c.NeedVip {
		return false
	}
	return strings.TrimSpace(c.VideoURL) != "" && c.PayType == 0
}

// AllowWatch 详情选集是否可直达播放（优先 canWatch）。
func (c PlayletChapterData) AllowWatch() bool {
	if c.CanWatch {
		return true
	}
	if c.NeedUnlock || c.NeedVip {
		return false
	}
	if c.IsUnlocked {
		return true
	}
	return c.PayType == 0
}