package advitiseV2Ser

import (
	"context"
	"errors"
	"stat/api/proto"
	"stat/common/log"
	"stat/models/advitiseBindMod"
	"stat/models/advitiseClickStatMod"
	"stat/models/advitiseDayClickStatMod"
	"stat/models/advitiseInfoMod"
	"stat/models/advitiseLocationMod"
	"time"

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

// idScale 把 (bindId, locId) 编码进单个 int64 id 的乘数
// 约束:locId < idScale。int64 上限允许 bindId 最大约 9.2e13,远超实际 LID 生成量
const idScale = int64(100000)

// GetAdvitises 外部拉广告:响应结构与老 GetAdvertise (proto.AdvertiseRes) 一致
//   - 每条广告绑定一个 (bindId, locId) 组合
//   - CoverImg 依据 location.AdvitiseSize 选 info 里对应尺寸组的第一张
//   - 返回的 id = bindId*idScale + locId,client 点击时原样回传,后端解码定位 (bind, locId)
//   - BindId 也单独返回,给愿意用二维接口的 client 用
func GetAdvitises(ctx context.Context, req *proto.GetAdvitiseV2Req) (*proto.AdvertiseRes, error) {
	resp := &proto.AdvertiseRes{AdvertiseList: make([]*proto.AdvertiseInfo, 0)}

	// 1) 拉 bind
	filter := bson.M{advitiseBindMod.FN.AdvitiseBind.AppId: req.AppId}
	if req.LocationId != nil {
		filter[advitiseBindMod.FN.AdvitiseBind.LocationId] = *req.LocationId
	}
	opt := &options.FindOptions{}
	opt.SetSort(bson.D{
		{Key: advitiseBindMod.FN.AdvitiseBind.Sort, Value: -1},
		{Key: advitiseBindMod.FN.AdvitiseBind.CreatedAt, Value: -1},
	})
	binds, err := advitiseBindMod.FindManyAdvitiseBinds(ctx, filter, opt)
	if err != nil {
		return nil, err
	}
	if len(binds) == 0 {
		return resp, nil
	}

	// 2) 批量拉当前生效 info
	advitiseIds := uniqInt64(func() []int64 {
		out := make([]int64, 0, len(binds))
		for _, b := range binds {
			out = append(out, b.AdvitiseId)
		}
		return out
	}())
	now := time.Now()
	infos, err := advitiseInfoMod.FindManyAdvitiseInfos(ctx, bson.M{
		advitiseInfoMod.FN.AdvitiseInfo.Id:        bson.M{"$in": advitiseIds},
		advitiseInfoMod.FN.AdvitiseInfo.Status:    true,
		advitiseInfoMod.FN.AdvitiseInfo.StartTime: bson.M{"$lte": now},
		advitiseInfoMod.FN.AdvitiseInfo.EndTime:   bson.M{"$gte": now},
	})
	if err != nil {
		return nil, err
	}
	infoMap := make(map[int64]*advitiseInfoMod.AdvitiseInfo, len(infos))
	for _, info := range infos {
		infoMap[info.Id] = info
	}

	// 3) 批量拉 location(用于 CoverImg 尺寸匹配)
	locIdsAll := uniqInt32(func() []int32 {
		out := make([]int32, 0)
		for _, b := range binds {
			out = append(out, b.LocationId...)
		}
		return out
	}())
	locMap := make(map[int32]*advitiseLocationMod.AdvitiseLocation)
	if len(locIdsAll) > 0 {
		locs, lerr := advitiseLocationMod.FindManyAdvitiseLocations(ctx, bson.M{
			advitiseLocationMod.FN.AdvitiseLocation.AppId: req.AppId,
			advitiseLocationMod.FN.AdvitiseLocation.LocId: bson.M{"$in": locIdsAll},
		})
		if lerr == nil {
			for _, l := range locs {
				locMap[l.LocId] = l
			}
		}
	}

	// 4) 展开 bind × location 为 item
	for _, b := range binds {
		info, ok := infoMap[b.AdvitiseId]
		if !ok {
			continue
		}
		for _, locId := range b.LocationId {
			if req.LocationId != nil && locId != *req.LocationId {
				continue
			}
			var size advitiseLocationMod.AdvitiseSizeType
			if loc, ok := locMap[locId]; ok && loc != nil {
				size = loc.AdvitiseSize
			}
			resp.AdvertiseList = append(resp.AdvertiseList, &proto.AdvertiseInfo{
				Id:           b.Id*idScale + int64(locId),
				Title:        info.Title,
				CoverImg:     pickCoverImg(info, size),
				LocId:        locId,
				JumpType:     0, // V2 素材未维护跳转类型,默认外部浏览器
				Link:         info.Link,
				Sort:         b.Sort,
				Type:         0,
				Tags:         "",
				Remark:       info.Remark,
				AmbientColor: "",
				BindId:       b.Id,
			})
		}
	}
	return resp, nil
}

// pickCoverImg 按位置尺寸选一张封面;取不到就用任一非空数组的第一张兜底
func pickCoverImg(info *advitiseInfoMod.AdvitiseInfo, size advitiseLocationMod.AdvitiseSizeType) string {
	var arr []string
	switch size {
	case advitiseLocationMod.AdvitiseSizeFullScreen:
		arr = info.FullScreenImgs
	case advitiseLocationMod.AdvitiseSizeBanner720300:
		arr = info.Banner720300Imgs
	case advitiseLocationMod.AdvitiseSizeBanner720150:
		arr = info.Banner720150Imgs
	case advitiseLocationMod.AdvitiseSizeBanner750700:
		arr = info.Banner750700Imgs
	case advitiseLocationMod.AdvitiseSizeBanner800450:
		arr = info.Banner800450Imgs
	case advitiseLocationMod.AdvitiseSizePopUps600800:
		arr = info.PopUps600800Imgs
	case advitiseLocationMod.AdvitiseSizePopUps512512:
		arr = info.PopUps512512Imgs
	case advitiseLocationMod.AdvitiseSizeSmallCube:
		arr = info.SmallCubeImgs
	case advitiseLocationMod.AdvitiseSizeVerticalCube:
		arr = info.VerticalCubeImgs
	}
	if len(arr) > 0 {
		return arr[0]
	}
	// 兜底:任一非空数组的第一张
	for _, cand := range [][]string{
		info.FullScreenImgs, info.Banner720300Imgs, info.Banner720150Imgs,
		info.Banner750700Imgs, info.Banner800450Imgs,
		info.PopUps600800Imgs, info.PopUps512512Imgs,
		info.SmallCubeImgs, info.VerticalCubeImgs,
	} {
		if len(cand) > 0 {
			return cand[0]
		}
	}
	return ""
}

func uniqInt64(in []int64) []int64 {
	seen := make(map[int64]struct{}, len(in))
	out := make([]int64, 0, len(in))
	for _, v := range in {
		if _, ok := seen[v]; ok {
			continue
		}
		seen[v] = struct{}{}
		out = append(out, v)
	}
	return out
}

func uniqInt32(in []int32) []int32 {
	seen := make(map[int32]struct{}, len(in))
	out := make([]int32, 0, len(in))
	for _, v := range in {
		if _, ok := seen[v]; ok {
			continue
		}
		seen[v] = struct{}{}
		out = append(out, v)
	}
	return out
}

// ClickAdvitise 点击回传:media 逻辑
//  1. advitise_click_stat  upsert +1  (appId, advitiseId, locationId, day)
//  2. advitise_day_click_stat  upsert +1  (advitiseId, day)
func ClickAdvitise(ctx context.Context, req *proto.ClickAdvitiseV2Req) error {
	bindId := req.Id / idScale
	location := int32(req.Id % idScale)
	bind, err := advitiseBindMod.FindOneAdvitiseBind(ctx, bson.M{advitiseBindMod.FN.AdvitiseBind.Id: bindId})
	if err != nil || bind == nil {
		return errors.New("bind not found")
	}

	day := time.Now().Truncate(24 * time.Hour)

	if err := advitiseClickStatMod.InsertOrUpdate(ctx, bind.AppId, bind.AdvitiseId, location, day); err != nil {
		log.Warn("v2 click: fine stat upsert failed", log.E(err))
		return err
	}
	if err := advitiseDayClickStatMod.InsertOrUpdate(ctx, bind.AdvitiseId, day); err != nil {
		// 汇总表失败不阻断细维度已成功的记录
		log.Warn("v2 click: day rollup upsert failed", log.E(err))
	}
	return nil
}