package shanghu

import (
	"duoduo/apis/shanghu/models"
	"duoduo/models/shanghu"
	"duoduo/tools"
	"duoduo/tools/app"
	"errors"
	"fmt"
	"github.com/gin-gonic/gin"
	"math/rand"
	"time"
)

// 一个活动对应一个抽奖，一个抽奖对应多个奖品
// 一个活动对应多个拼团，一个拼团对应一个张主图，一个拼团对应多个商品（多个商品是为了核销）
func ActiveConfigCreate(c *gin.Context) {
	var inData models.CreateActiveConfigRequest
	var sqlData shanghu.MerchantActiveConfig
	var drawProduct shanghu.MerchantActiveDrawProduct

	err := c.ShouldBindJSON(&inData)
	if err != nil {
		app.Error(c, 400, err, err.Error())
		return
	}

	if inData.DrawMode != 0 {
		if len(inData.DrawId) <= 0 {
			app.Error(c, 500, errors.New("奖品未配置"), "奖品未配置")
			return
		}
		//校验总概率 总概率相加不能大于100
		drawList, _, err := drawProduct.GetDrawProductListById(inData.DrawId)
		if err != nil {
			app.Error(c, 500, err, err.Error())
			return
		}

		sumOdds := 0

		for _, v := range drawList {
			sumOdds = sumOdds + v.DrawOdds
		}
		if sumOdds != 100 {
			app.Error(c, 500, errors.New("配置的总中奖率不满100%"), "配置的总中奖率不满100%")
			return
		}
	}

	if inData.GroupBuyMode == 0 && inData.DrawMode == 0 {
		app.Error(c, 500, errors.New("请选择抽奖与开团"), "请选择抽奖与开团")
		return
	}

	sqlData.ActivityEndTime, err = tools.TimeToInt64(inData.ActivityEndTime, "2006-01-02")
	if err != nil {
		app.Error(c, 400, err, err.Error())
		return
	}

	sqlData.ActivityStartTime, err = tools.TimeToInt64(inData.ActivityStartTime, "2006-01-02")
	if err != nil {
		app.Error(c, 400, err, err.Error())
		return
	}

	//必中校验
	//if inData.DrawOneBiZhong > 0 {
	//	var checkBZ shanghu.MerchantActiveDrawProduct
	//	checkBZ.ID = inData.DrawOneBiZhong
	//	bZInfo, err := checkBZ.GetDrawProductById()
	//	if err != nil {
	//		app.Error(c, 500, err, err.Error())
	//		return
	//	}
	//
	//	if !bZInfo.IsPrize {  //
	//		app.Error(c, 500, err, err.Error())
	//		return
	//	}
	//}

	sqlData.ActiveName = inData.ActiveName
	sqlData.MerchantOpenID = inData.MerchantOpenID
	sqlData.CreatedAt = time.Now()
	sqlData.UpdatedAt = time.Now()
	sqlData.ConfigMode = 1
	sqlData.DrawOneBiZhong = inData.DrawOneBiZhong
	sqlData.DrawMode = inData.DrawMode
	sqlData.GroupBuyMode = inData.GroupBuyMode
	sqlData.GroupBuyUrl = inData.GroupBuyUrl
	sqlData.GroupBuy = `{}`
	sqlData.DrawProduct = `{}`

	configData, err := sqlData.Create()
	if err != nil {
		app.Error(c, 500, err, err.Error())
		return
	}

	for _, v := range inData.DrawId {
		var drawData shanghu.MerchantActiveDrawProduct
		drawData.ActiveConfigID = configData.ID
		err = drawData.UpdateConfigId(v)
		if err != nil {
			app.Error(c, 500, err, err.Error())
			return
		}
	}
	for _, v := range inData.GroupBuyId {
		var groupBuy shanghu.MerchantActiveGroupBuy
		groupBuy.ActiveConfigID = configData.ID
		err = groupBuy.UpdateConfigId(v)
		if err != nil {
			app.Error(c, 500, err, err.Error())
			return
		}
	}

	app.OK(c, nil, app.Success)
}

// 活动配置信息
func ActiveConfigInfo(c *gin.Context) {
	var inData models.ActiveConfigRequest
	var sqlData shanghu.MerchantActiveConfig
	var outData models.ActiveConfigReply
	var drawInfoSql shanghu.MerchantActiveDrawProduct
	var groupBuy shanghu.MerchantActiveGroupBuy

	err := c.ShouldBindJSON(&inData)
	if err != nil {
		app.Error(c, 400, err, err.Error())
		return
	}

	sqlData.MerchantOpenID = inData.MerchantOpenID
	sqlData.ID = inData.ActiveConfigId

	configInfo, err := sqlData.GetConfigInfoById()
	if err != nil {
		app.Error(c, 500, err, err.Error())
		return
	}
	outData.GroupBuyMode = configInfo.GroupBuyMode
	outData.DrawMode = configInfo.DrawMode
	outData.GroupBuyUrl = configInfo.GroupBuyUrl
	outData.DrawOneBiZhong = configInfo.DrawOneBiZhong
	outData.ActivityEndTime = tools.TimeToStr(configInfo.ActivityEndTime)
	outData.ActivityStartTime = tools.TimeToStr(configInfo.ActivityStartTime)
	outData.ActiveName = configInfo.ActiveName

	//中奖商品
	drawInfoSql.ActiveConfigID = configInfo.ID

	drawInfo, _, err := drawInfoSql.GetDrawProductList()
	if err != nil {
		app.Error(c, 500, err, err.Error())
		return
	}

	for _, v := range drawInfo {
		var drawProduct models.DrawProduct
		drawProduct.DrawProductName = v.DrawProductName
		drawProduct.DrawUrl = v.DrawUrl
		drawProduct.DrawOdds = v.DrawOdds
		drawProduct.IsPrize = v.IsPrize
		drawProduct.TotalStock = v.TotalStock
		drawProduct.Stock = v.Stock
		outData.DrawProduct = append(outData.DrawProduct, drawProduct)
	}

	// 查询拼团列表
	groupBuy.ActiveConfigID = configInfo.ID

	groupBuyInfoList, _, err := groupBuy.GetGroupBuyList()
	if err != nil {
		app.Error(c, 500, err, err.Error())
		return
	}

	for _, v := range groupBuyInfoList {
		var groupBuyInfo models.DrawGroupBuy
		var groupBuyProject shanghu.MerchantActiveGroupByProject
		groupBuyInfo.GroupBuyName = v.GroupBuyName
		groupBuyInfo.GroupBuyMode = v.GroupBuyMode
		groupBuyInfo.GroupBuyUrl = v.GroupBuyUrl
		groupBuyInfo.GroupBuyThreeNum = v.GroupBuyThreeNum
		groupBuyInfo.GroupBuyThreePrice = v.GroupBuyThreePrice
		groupBuyInfo.GroupBuyFourNum = v.GroupBuyFourNum
		groupBuyInfo.GroupBuyFourPrice = v.GroupBuyFourPrice
		groupBuyInfo.GroupBuyTwoNum = v.GroupBuyTwoNum
		groupBuyInfo.GroupBuyTwoPrice = v.GroupBuyTwoPrice
		groupBuyInfo.GroupBuyOneNum = v.GroupBuyOneNum
		groupBuyInfo.GroupBuyOnePrice = v.GroupBuyOnePrice
		groupBuyInfo.MerchantOpenID = v.MerchantOpenID
		groupBuyInfo.OriginalPrice = v.OriginalPrice
		groupBuyInfo.RebateRate = v.RebateRate

		groupBuyProject.GroupBuyID = v.ID

		projectList, _, err := groupBuyProject.GetGroupBuyProjectList()
		if err != nil {
			app.Error(c, 500, err, err.Error())
			return
		}

		for _, v := range projectList {
			var groupBuyProjectInfo models.GroupBuyProject
			groupBuyProjectInfo.ProjectName = v.ProjectName
			groupBuyProjectInfo.CancelNum = v.CancelNum
			groupBuyInfo.GroupBuyProject = append(groupBuyInfo.GroupBuyProject, groupBuyProjectInfo)
		}

		outData.DrawGroupBuy = append(outData.DrawGroupBuy, groupBuyInfo)

	}

	app.OK(c, outData, app.Success)

}

// 活动列表
func ActiveConfigList(c *gin.Context) {
	var inData models.ActiveConfigListRequest
	var sqlData shanghu.MerchantActiveConfig
	var outData []models.ActiveConfigListReply

	err := c.ShouldBindJSON(&inData)
	if err != nil {
		app.Error(c, 400, err, err.Error())
		return
	}
	sqlData.MerchantOpenID = inData.OpenId
	var pageSize = 10
	var pageIndex = 1

	if inData.PageSize != 0 {
		pageSize = inData.PageSize
	}
	if inData.PageIndex != 0 {
		pageIndex = inData.PageIndex
	}

	activeConfigList, count, err := sqlData.GetActiveConfigList(pageSize, pageIndex)
	if err != nil {
		app.Error(c, 500, err, err.Error())
		return
	}

	for _, v := range activeConfigList {
		var activeConfig models.ActiveConfigListReply
		activeConfig.ID = v.ID
		activeConfig.ActivityStart = tools.TimeToStr(v.ActivityStartTime)
		activeConfig.ActivityEnd = tools.TimeToStr(v.ActivityEndTime)
		activeConfig.ActiveName = v.ActiveName
		activeConfig.CreatedAt = v.CreatedAt.Format(time.DateTime)

		outData = append(outData, activeConfig)

	}

	app.PageOK(c, outData, count, pageIndex, pageSize, app.Success)

}

// 抽奖
func Draw(c *gin.Context) {
	var inData models.DrawRequest
	var sqlData shanghu.MerchantActiveConfig
	var drawNumSql shanghu.ClientActiveDrawNum
	var draw shanghu.ClientActiveDrawLog
	var outData models.DrawReply

	err := c.ShouldBindJSON(&inData)
	if err != nil {
		app.Error(c, 400, err, err.Error())
		return
	}

	// 校验抽奖次数
	drawNumSql.ActiveConfigID = inData.ActiveConfigID
	drawNumSql.ClientOpenID = inData.ClientOpenID
	drawNum, err := drawNumSql.GetDrawNum()
	if err != nil {
		app.Error(c, 500, err, err.Error())
		return
	}

	//校验数量
	draw.ActiveConfigID = inData.ActiveConfigID
	draw.ClientOpenID = inData.ClientOpenID
	clientDrawNum, err := draw.GetClientActiveDrawLogNum()
	if err != nil {
		app.Error(c, 500, err, err.Error())
		return
	}

	if drawNum+1 < clientDrawNum {
		app.Error(c, 500, errors.New("抽奖次数用完"), "抽奖次数用完")
		return
	}

	// 先校验是否有必中抽奖
	sqlData.ID = inData.ActiveConfigID
	config, err := sqlData.GetConfigInfoById()
	if err != nil {
		app.Error(c, 500, err, err.Error())
		return
	}

	if config.DrawOneBiZhong > 0 {
		// 必中抽奖需要产看中奖记录是否中过，没有中过直接中，中过了走正常的中奖概率
		var drawConfig shanghu.ClientActiveDrawLog
		drawConfig.ActiveConfigID = inData.ActiveConfigID
		drawConfig.ClientOpenID = inData.ClientOpenID
		drawConfig.DrawProductID = config.DrawOneBiZhong

		count, err := drawConfig.GetClientActiveDrawLogByBiZHong()
		if err != nil {
			app.Error(c, 500, err, err.Error())
			return
		}

		// 为0直接中奖 写中奖记录并且返回 查询中奖
		if count == 0 {
			//var draw shanghu.ClientActiveDrawLog
			var drawProduct shanghu.MerchantActiveDrawProduct

			drawProduct.ID = config.DrawOneBiZhong
			drawProductInfo, err := drawProduct.GetDrawProductById()
			if err != nil {
				app.Error(c, 500, err, err.Error())
				return
			}

			if drawProductInfo.ActiveConfigID != inData.ActiveConfigID {
				app.Error(c, 500, errors.New("必中配置活动不一致"), "必中配置活动不一致")
				return
			}

			if drawProductInfo.Stock <= 0 {
				app.Error(c, 500, errors.New("库存不足"), "库存不足")
				return
			}

			fmt.Println(drawProductInfo)

			//新建log 减库存
			err = subStockAddLog(drawProductInfo, inData.ClientOpenID)
			if err != nil {
				app.Error(c, 500, err, err.Error())
				return
			}

			//draw.DrawProductID = config.DrawOneBiZhong
			//draw.ActiveConfigID = inData.ActiveConfigID
			//draw.ClientOpenID = inData.ClientOpenID
			//
			//if drawProductInfo.IsPrize {
			//	draw.IsPrize = models.NotClaimed //未兑奖 必中一定是要能兑奖的。
			//} else {
			//	draw.IsPrize = models.NotWon //未中奖
			//}
			//
			//draw.CreatedAt = time.Now()
			//draw.UpdatedAt = time.Now()
			//_, err = draw.Create() //创建完成
			//if err != nil {
			//	app.Error(c, 500, err, err.Error())
			//	return
			//}

			outData.DrawProductName = drawProductInfo.DrawProductName
			outData.DrawUrl = drawProductInfo.DrawUrl
			outData.ID = config.DrawOneBiZhong

			app.OK(c, outData, app.Success)
			return
		}

	}

	var drawProductList shanghu.MerchantActiveDrawProduct
	var prizeList []Prize
	drawProductList.ActiveConfigID = inData.ActiveConfigID
	drawProductInfo, _, err := drawProductList.GetDrawProductListByActiveId()
	if err != nil {
		app.Error(c, 500, err, err.Error())
		return
	}

	for _, v := range drawProductInfo {
		var prize Prize
		if v.Stock <= 0 {
			continue
		}
		prize.Name = v.DrawProductName
		prize.ID = v.ID
		prize.Weight = v.DrawOdds
		prize.InitStock = v.TotalStock
		prize.Stock = v.Stock
		prizeList = append(prizeList, prize)

	}
	//fmt.Println(prizeList)
	// 创建抽奖实例
	lottery := NewLottery(prizeList)

	// 执行1次抽奖
	results, err := lottery.Draw(1)
	if err != nil {
		app.Error(c, 500, err, err.Error())
		return
	}
	fmt.Println(results)
	var drawProduct shanghu.MerchantActiveDrawProduct
	for _, v := range drawProductInfo {
		if results[0].ID == v.ID {
			outData.ID = v.ID
			outData.DrawUrl = v.DrawUrl
			outData.DrawProductName = v.DrawProductName
			drawProduct = v
			break
		}
	}

	//库存减一 并且新增记录
	err = subStockAddLog(drawProduct, inData.ClientOpenID)
	if err != nil {
		app.Error(c, 500, err, err.Error())
		return
	}

	app.OK(c, outData, app.Success)

}

type Prize struct {
	ID        int64  // 奖品ID
	Name      string // 奖品名称
	Weight    int    // 权重
	Stock     int    // 库存数量
	InitStock int    // 初始库存（用于展示）
}

// 带权重和库存的抽奖
type Lottery struct {
	Prizes      []Prize
	TotalWeight int
}

func NewLottery(prizes []Prize) *Lottery {
	totalWeight := 0
	for _, prize := range prizes {
		totalWeight += prize.Weight
	}

	// 深拷贝奖品列表并初始化初始库存
	prizeCopy := make([]Prize, len(prizes))
	for i, p := range prizes {
		prizeCopy[i] = p
		prizeCopy[i].InitStock = p.Stock
	}

	return &Lottery{
		Prizes:      prizeCopy,
		TotalWeight: totalWeight,
	}
}

func (l *Lottery) Draw(times int) ([]Prize, error) {
	// 检查总库存是否足够
	totalStock := 0
	for _, prize := range l.Prizes {
		totalStock += prize.Stock
	}
	if totalStock < times {
		return nil, fmt.Errorf("剩余总库存(%d)不足以支持%d次抽奖", totalStock, times)
	}

	rand.Seed(time.Now().UnixNano())
	results := make([]Prize, 0, times)

	for i := 0; i < times; i++ {
		// 如果没有可用奖品了就停止
		if l.TotalWeight <= 0 {
			break
		}

		randNum := rand.Intn(l.TotalWeight)
		currentWeight := 0

		for j := range l.Prizes {
			if l.Prizes[j].Stock <= 0 {
				continue
			}

			currentWeight += l.Prizes[j].Weight
			if randNum < currentWeight {
				// 中奖
				results = append(results, l.Prizes[j])
				// 减少库存
				l.Prizes[j].Stock--
				// 如果库存耗尽，更新总权重
				if l.Prizes[j].Stock == 0 {
					l.TotalWeight -= l.Prizes[j].Weight
				}
				break
			}
		}
	}

	return results, nil
}

// 新建记录，减库存
func subStockAddLog(drawProductInfo shanghu.MerchantActiveDrawProduct, clientOpenId string) error {
	var draw shanghu.ClientActiveDrawLog
	//var drawProduct shanghu.MerchantActiveDrawProduct

	if drawProductInfo.Stock <= 0 {

		return errors.New("库存不足")
	}

	//减库存
	err := drawProductInfo.SubStock()
	if err != nil {
		return err
	}

	// 新建记录
	draw.DrawProductID = drawProductInfo.ID
	draw.ActiveConfigID = drawProductInfo.ActiveConfigID
	draw.ClientOpenID = clientOpenId

	if drawProductInfo.IsPrize {
		draw.IsPrize = models.NotClaimed //未兑奖 必中一定是要能兑奖的。
	} else {
		draw.IsPrize = models.NotWon //未中奖
	}

	draw.CreatedAt = time.Now()
	draw.UpdatedAt = time.Now()
	_, err = draw.Create() //创建完成
	if err != nil {
		return err
	}

	return nil
}