package srv_search

import (
	"context"
	"hkdj-web-server/pub/common/log"
	"hkdj-web-server/pub/common/srvdef"
	"hkdj-web-server/pub/esmanager"
	"hkdj-web-server/pub/models/esmod"
	"hkdj-web-server/pub/models/playletmod"
	"hkdj-web-server/pub/models/playlettagmod"
	"hkdj-web-server/pub/models/playletthememod"
	"strconv"

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

var playletESProjection = bson.D{
	{Key: playletmod.FN.Playlet.Id, Value: 1},
	{Key: playletmod.FN.Playlet.Status, Value: 1},
	{Key: playletmod.FN.Playlet.IsFeatured, Value: 1},
	{Key: playletmod.FN.Playlet.IsRecommend, Value: 1},
	{Key: playletmod.FN.Playlet.OperateType, Value: 1},
	{Key: playletmod.FN.Playlet.ShowOnBanner, Value: 1},
	{Key: playletmod.FN.Playlet.Banner, Value: 1},
	{Key: playletmod.FN.Playlet.OnlineAt, Value: 1},
	{Key: playletmod.FN.Playlet.ThemeIds, Value: 1},
	{Key: playletmod.FN.Playlet.CategoryIds, Value: 1},
	{Key: playletmod.FN.Playlet.Title, Value: 1},
	{Key: playletmod.FN.Playlet.PlayName, Value: 1},
	{Key: playletmod.FN.Playlet.Description, Value: 1},
	{Key: playletmod.FN.Playlet.Slug, Value: 1},
	{Key: playletmod.FN.Playlet.Desc, Value: 1},
	{Key: playletmod.FN.Playlet.Anchor, Value: 1},
	{Key: playletmod.FN.Playlet.Cover, Value: 1},
	{Key: playletmod.FN.Playlet.CompressedCover, Value: 1},
	{Key: playletmod.FN.Playlet.TagIds, Value: 1},
	{Key: playletmod.FN.Playlet.TotalEpisode, Value: 1},
	{Key: playletmod.FN.Playlet.UpdateStatus, Value: 1},
	{Key: playletmod.FN.Playlet.CountBrowse, Value: 1},
	{Key: playletmod.FN.Playlet.HeatValue, Value: 1},
	{Key: playletmod.FN.Playlet.CountCollect, Value: 1},
	{Key: playletmod.FN.Playlet.CountLike, Value: 1},
	{Key: playletmod.FN.Playlet.VirtualCountLike, Value: 1},
	{Key: playletmod.FN.Playlet.CreatedAt, Value: 1},
	{Key: playletmod.FN.Playlet.UpdatedAt, Value: 1},
	{Key: "seoInfo", Value: 1},
}

// SyncPlayletStatusToES 根据短剧上下架状态同步ES搜索数据
func SyncPlayletStatusToES(ctx context.Context, ids []int64, status playletmod.Status) *srvdef.SrvErr {
	// ES只保留已上架短剧；上架写入/更新索引，下架从索引删除。
	if len(ids) == 0 {
		return nil
	}
	if esmanager.Instance == nil {
		log.Error("短剧ES同步失败，ES未初始化", log.Any("短剧ID", ids), log.Any("状态", status))
		return srvdef.New(srvdef.ErrElsOperError, "", "")
	}
	switch status {
	case playletmod.StatusUp:
		return upsertPlayletsToES(ctx, ids)
	case playletmod.StatusDown:
		return deletePlayletsFromES(ids)
	default:
		return nil
	}
}

// upsertPlayletsToES 批量写入已上架短剧ES文档
func upsertPlayletsToES(ctx context.Context, ids []int64) *srvdef.SrvErr {
	// 只查询已上架数据，避免并发状态变化后把已下架短剧重新写进ES。
	list, err := playletmod.FindManyPlaylet(ctx, bson.M{
		playletmod.FN.Playlet.Id:     bson.M{"$in": ids},
		playletmod.FN.Playlet.Status: playletmod.StatusUp,
	}, options.Find().SetProjection(playletESProjection))
	if err != nil {
		return err
	}
	if len(list) == 0 {
		return nil
	}
	themeNameMap, err := buildPlayletESThemeNameMap(ctx, list)
	if err != nil {
		return err
	}
	tagNameMap, err := buildPlayletESTagNameMap(ctx, list)
	if err != nil {
		return err
	}
	esData := make(esmanager.M, len(list))
	for _, item := range list {
		if item == nil {
			continue
		}
		esData[strconv.FormatInt(item.Id, 10)] = playletToESDoc(item, themeNameMap, tagNameMap)
	}
	if len(esData) == 0 {
		return nil
	}
	if err = AddMultiDataToES(esmod.GetPlayletIndex(), esData); err != nil {
		log.Error("批量写入短剧ES失败", log.Any("短剧ID", ids), log.E(err))
		return err
	}
	log.Info("批量写入短剧ES成功", log.Any("数量", len(esData)), log.Any("短剧ID", ids))
	return nil
}

// deletePlayletsFromES 批量删除短剧ES文档
func deletePlayletsFromES(ids []int64) *srvdef.SrvErr {
	// ES文档ID和Mongo短剧业务ID保持一致，可以直接按ID批量删除。
	strIds := make([]string, 0, len(ids))
	for _, id := range ids {
		if id <= 0 {
			continue
		}
		strIds = append(strIds, strconv.FormatInt(id, 10))
	}
	if len(strIds) == 0 {
		return nil
	}
	if err := batchDelFromES(esmod.GetPlayletIndex(), strIds); err != nil {
		log.Error("批量删除短剧ES失败", log.Any("短剧ID", ids), log.E(err))
		return err
	}
	log.Info("批量删除短剧ES成功", log.Any("数量", len(strIds)), log.Any("短剧ID", ids))
	return nil
}

// playletToESDoc 转换短剧Mongo数据为ES文档
func playletToESDoc(item *playletmod.Playlet, themeNameMap map[int64]string, tagNameMap map[int64]string) *esmod.ESPlaylet {
	// ES文档保留题材名和标签名，app搜索可直接命中剧名、题材名、简介和标签名。
	return &esmod.ESPlaylet{
		Id:           item.Id,
		Status:       item.Status,
		IsFeatured:   item.IsFeatured,
		IsRecommend:  item.IsRecommend,
		OperateType:  playletmod.NormalizeOperateType(item.OperateType),
		ShowOnBanner: item.ShowOnBanner,
		Banner:       item.Banner,
		OnlineAt:     item.OnlineAt,
		ThemeIds:     item.ThemeIds,
		ThemeNames:   playletESNamesByIds(item.ThemeIds, themeNameMap),
		CategoryIds:  item.CategoryIds,
		Title:        item.Title,
		PlayName:     item.PlayName,
		Description:  item.Description,
		Slug:         item.Slug,
		Desc:         item.Desc,
		Anchor:       item.Anchor,
		Cover:        item.DisplayCover(),
		TagIds:       item.TagIds,
		TagNames:     playletESNamesByIds(item.TagIds, tagNameMap),
		TotalEpisode: item.TotalEpisode,
		UpdateStatus: item.UpdateStatus,
		CountBrowse:  item.CountBrowse,
		HeatValue:    item.HeatValue,
		CountCollect: item.CountCollect,
		CountLike:    item.CountLike + item.VirtualCountLike,
		CreatedAt:    item.CreatedAt,
		UpdatedAt:    item.UpdatedAt,
		SeoInfo:      item.SeoInfo,
	}
}

// buildPlayletESThemeNameMap 批量查询短剧题材名称
func buildPlayletESThemeNameMap(ctx context.Context, list playletmod.PlayletList) (map[int64]string, *srvdef.SrvErr) {
	ids := collectPlayletESIds(list, func(item *playletmod.Playlet) []int64 {
		return item.ThemeIds
	})
	result := make(map[int64]string, len(ids))
	if len(ids) == 0 {
		return result, nil
	}
	themes, err := playletthememod.FindManyPlayletTheme(ctx, bson.M{
		playletthememod.FN.PlayletTheme.Id: bson.M{"$in": ids},
	}, options.Find().SetProjection(bson.D{
		{Key: playletthememod.FN.PlayletTheme.Id, Value: 1},
		{Key: playletthememod.FN.PlayletTheme.Name, Value: 1},
	}))
	if err != nil {
		return nil, err
	}
	for _, theme := range themes {
		if theme != nil {
			result[theme.Id] = theme.Name
		}
	}
	return result, nil
}

// buildPlayletESTagNameMap 批量查询短剧标签名称
func buildPlayletESTagNameMap(ctx context.Context, list playletmod.PlayletList) (map[int64]string, *srvdef.SrvErr) {
	ids := collectPlayletESIds(list, func(item *playletmod.Playlet) []int64 {
		return item.TagIds
	})
	result := make(map[int64]string, len(ids))
	if len(ids) == 0 {
		return result, nil
	}
	tags, err := playlettagmod.FindManyPlayletTag(ctx, bson.M{
		playlettagmod.FN.PlayletTag.Id: bson.M{"$in": ids},
	}, options.Find().SetProjection(bson.D{
		{Key: playlettagmod.FN.PlayletTag.Id, Value: 1},
		{Key: playlettagmod.FN.PlayletTag.Name, Value: 1},
	}))
	if err != nil {
		return nil, err
	}
	for _, tag := range tags {
		if tag != nil {
			result[tag.Id] = tag.Name
		}
	}
	return result, nil
}

// collectPlayletESIds 汇总并去重短剧题材或标签ID
func collectPlayletESIds(list playletmod.PlayletList, pick func(item *playletmod.Playlet) []int64) []int64 {
	result := make([]int64, 0)
	seen := make(map[int64]struct{})
	for _, item := range list {
		if item == nil {
			continue
		}
		for _, id := range pick(item) {
			if id <= 0 {
				continue
			}
			if _, ok := seen[id]; ok {
				continue
			}
			seen[id] = struct{}{}
			result = append(result, id)
		}
	}
	return result
}

// playletESNamesByIds 按ID顺序返回ES文档名称集合
func playletESNamesByIds(ids []int64, nameMap map[int64]string) []string {
	result := make([]string, 0, len(ids))
	for _, id := range ids {
		if name := nameMap[id]; name != "" {
			result = append(result, name)
		}
	}
	return result
}