package playletwatchprogressmod

import (
	"context"
	"fmt"
	"time"
	"videoweb/pub/common/log"
	"videoweb/pub/common/srvdef"
	"videoweb/pub/mongos"

	"go.mongodb.org/mongo-driver/bson"
	"go.mongodb.org/mongo-driver/mongo"
	"go.mongodb.org/mongo-driver/mongo/options"
)

var coll *mongos.Collection

// Init 初始化 playlet_watch_progress 集合和常用查询索引
func Init(ctx context.Context) {
	coll = mongos.Shop.Coll(TN.PlayletWatchProgress)
	initIndex(ctx)
}

func initIndex(ctx context.Context) {
	indexes := []mongo.IndexModel{
		{
			Keys: bson.D{
				{Key: FN.PlayletWatchProgress.UserId, Value: 1},
				{Key: FN.PlayletWatchProgress.PlayletId, Value: 1},
			},
			Options: options.Index().SetUnique(true),
		},
		{
			Keys: bson.D{
				{Key: FN.PlayletWatchProgress.UserId, Value: 1},
				{Key: FN.PlayletWatchProgress.UpdatedAt, Value: -1},
			},
		},
		{
			Keys: bson.D{
				{Key: FN.PlayletWatchProgress.PlayletId, Value: 1},
			},
		},
	}
	if _, err := coll.CreateIndex(ctx, indexes); err != nil {
		panic(fmt.Sprintf("(playletwatchprogressmod:initIndex) 创建索引失败 err:%+v:", err))
	}
}

// FindManyPlayletWatchProgress 按条件查询用户短剧观看进度
func FindManyPlayletWatchProgress(ctx context.Context, filter bson.M, opts ...*options.FindOptions) (PlayletWatchProgressList, *srvdef.SrvErr) {
	data := make(PlayletWatchProgressList, 0)
	if err := coll.Find(ctx, &data, filter, opts...); err != nil {
		log.Warn("查询短剧观看进度列表失败", log.E(err), log.Any("filter", filter))
		return nil, srvdef.New(srvdef.ErrDbQueryError, "", "")
	}
	return data, nil
}

// SavePlayletWatchProgress 保存用户短剧观看进度，并在达到已看条件时维护已看集数集合。
func SavePlayletWatchProgress(ctx context.Context, userId int64, playletId int64, chapterId int64, currentEpisode int64, markWatched bool) (*PlayletWatchProgress, *srvdef.SrvErr) {
	filter := bson.M{
		FN.PlayletWatchProgress.UserId:    userId,
		FN.PlayletWatchProgress.PlayletId: playletId,
	}
	doc, err := findOnePlayletWatchProgress(ctx, filter)
	if err != nil && err.Code != srvdef.ErrNoData {
		return nil, err
	}
	now := time.Now()
	if doc == nil {
		doc = &PlayletWatchProgress{
			Id:              mongos.Lid.PlayletWatchProgress.Get(),
			UserId:          userId,
			PlayletId:       playletId,
			WatchedEpisodes: make([]int64, 0),
			CreatedAt:       now,
		}
	}
	doc.LastChapterId = chapterId
	doc.LastEpisode = currentEpisode
	doc.UpdatedAt = now
	if markWatched && !hasEpisode(doc.WatchedEpisodes, currentEpisode) {
		doc.WatchedEpisodes = append(doc.WatchedEpisodes, currentEpisode)
	}
	doc.WatchedCount = int64(len(doc.WatchedEpisodes))
	update := bson.M{
		"$set": bson.M{
			FN.PlayletWatchProgress.LastChapterId:   doc.LastChapterId,
			FN.PlayletWatchProgress.LastEpisode:     doc.LastEpisode,
			FN.PlayletWatchProgress.WatchedEpisodes: doc.WatchedEpisodes,
			FN.PlayletWatchProgress.WatchedCount:    doc.WatchedCount,
			FN.PlayletWatchProgress.UpdatedAt:       doc.UpdatedAt,
		},
		"$setOnInsert": bson.M{
			FN.PlayletWatchProgress.Id:        doc.Id,
			FN.PlayletWatchProgress.UserId:    doc.UserId,
			FN.PlayletWatchProgress.PlayletId: doc.PlayletId,
			FN.PlayletWatchProgress.CreatedAt: doc.CreatedAt,
		},
	}
	if _, e := coll.UpsertOne(ctx, filter, update); e != nil {
		log.Warn("保存短剧观看进度失败", log.E(e), log.Any("filter", filter))
		return nil, srvdef.New(srvdef.ErrDbUpdateError, "", "")
	}
	return doc, nil
}

func findOnePlayletWatchProgress(ctx context.Context, filter bson.M) (*PlayletWatchProgress, *srvdef.SrvErr) {
	var doc PlayletWatchProgress
	if err := coll.FindOneEx(ctx, &doc, filter, options.FindOne().SetProjection(bson.D{
		{Key: FN.PlayletWatchProgress.Id, Value: 1},
		{Key: FN.PlayletWatchProgress.UserId, Value: 1},
		{Key: FN.PlayletWatchProgress.PlayletId, Value: 1},
		{Key: FN.PlayletWatchProgress.WatchedEpisodes, Value: 1},
		{Key: FN.PlayletWatchProgress.WatchedCount, Value: 1},
		{Key: FN.PlayletWatchProgress.CreatedAt, Value: 1},
	})); err != nil {
		if err == mongo.ErrNoDocuments {
			return nil, srvdef.New(srvdef.ErrNoData, "", "")
		}
		log.Warn("查询短剧观看进度失败", log.E(err), log.Any("filter", filter))
		return nil, srvdef.New(srvdef.ErrDbQueryError, "", "")
	}
	return &doc, nil
}

func hasEpisode(episodes []int64, target int64) bool {
	for _, episode := range episodes {
		if episode == target {
			return true
		}
	}
	return false
}