package logic

import (
	"context"
	"errors"
	"fmt"
	"fusenapi/constants"
	"fusenapi/model/gmodel"
	"fusenapi/utils/auth"
	"fusenapi/utils/basic"
	"fusenapi/utils/format"
	"fusenapi/utils/shopping_cart"
	"fusenapi/utils/step_price"
	"math"
	"strings"

	"fusenapi/server/shopping-cart/internal/svc"
	"fusenapi/server/shopping-cart/internal/types"

	"github.com/zeromicro/go-zero/core/logx"
)

type GetCartsLogic struct {
	logx.Logger
	ctx    context.Context
	svcCtx *svc.ServiceContext
}

func NewGetCartsLogic(ctx context.Context, svcCtx *svc.ServiceContext) *GetCartsLogic {
	return &GetCartsLogic{
		Logger: logx.WithContext(ctx),
		ctx:    ctx,
		svcCtx: svcCtx,
	}
}

// 处理进入前逻辑w,r
// func (l *GetCartsLogic) BeforeLogic(w http.ResponseWriter, r *http.Request) {
// }

func (l *GetCartsLogic) GetCarts(req *types.GetCartsReq, userinfo *auth.UserInfo) (resp *basic.Response) {
	userinfo.UserId = 39
	if req.CurrentPage <= 0 {
		req.CurrentPage = constants.DEFAULT_PAGE
	}
	limit := 10
	//获取用户购物车列表
	carts, total, err := l.svcCtx.AllModels.FsShoppingCart.GetAllCartsByParam(l.ctx, gmodel.GetAllCartsByParamReq{
		UserId: userinfo.UserId,
		Sort:   "id DESC",
		Page:   req.CurrentPage,
		Limit:  limit,
	})
	if err != nil {
		logx.Error(err)
		return resp.SetStatusWithMessage(basic.CodeDbSqlErr, "system err:failed to get your shopping carts")
	}
	if len(carts) == 0 {
		return resp.SetStatusWithMessage(basic.CodeOK, "success", types.GetCartsRsp{
			Meta: types.Meta{
				TotalCount:  total,
				PageCount:   int64(math.Ceil(float64(total) / float64(limit))),
				CurrentPage: req.CurrentPage,
				PerPage:     limit,
			},
			CartList: nil,
		})
	}
	var (
		mapSize      = make(map[int64]gmodel.FsProductSize)
		mapModel     = make(map[int64]gmodel.FsProductModel3d)
		mapTemplate  = make(map[int64]gmodel.FsProductTemplateV2)
		mapSizePrice = make(map[int64]gmodel.FsProductPrice)
	)
	//获取相关信息
	err = l.GetRelationInfo(GetRelationInfoReq{
		Carts:        carts,
		MapSize:      mapSize,
		MapModel:     mapModel,
		MapTemplate:  mapTemplate,
		MapSizePrice: mapSizePrice,
	})
	if err != nil {
		return resp.SetStatusWithMessage(basic.CodeServiceErr, err.Error())
	}
	//定义map收集变更信息
	mapCartChange := make(map[int64]string)
	mapSnapshot := make(map[int64]shopping_cart.CartSnapshot)
	//校验购物车数据是否变更
	err = shopping_cart.VerifyShoppingCartSnapshotDataChange(shopping_cart.VerifyShoppingCartSnapshotDataChangeReq{
		Carts:         carts,
		MapSize:       mapSize,
		MapModel:      mapModel,
		MapTemplate:   mapTemplate,
		MapCartChange: mapCartChange,
		MapSnapshot:   mapSnapshot,
	})
	if err != nil {
		logx.Error("VerifyShoppingCartSnapshotDataChange err:", err.Error())
		return resp.SetStatusWithMessage(basic.CodeServiceErr, "system err:failed to check shopping cart change data")
	}

	list := make([]types.CartItem, 0, len(carts))
	for _, cart := range carts {
		snapShot := mapSnapshot[cart.Id]
		sizePrice, ok := mapSizePrice[*cart.SizeId]
		if !ok {
			return resp.SetStatusWithMessage(basic.CodeServiceErr, fmt.Sprintf("the size`s price info is not exists:%d", *cart.SizeId))
		}
		//阶梯数量切片
		stepNum, err := format.StrSlicToIntSlice(strings.Split(*sizePrice.StepNum, ","))
		if err != nil {
			logx.Error(err)
			return resp.SetStatusWithMessage(basic.CodeServiceErr, fmt.Sprintf("failed to parse step number:%d", *cart.SizeId))
		}
		lenStepNum := len(stepNum)
		//阶梯价格切片
		stepPrice, err := format.StrSlicToIntSlice(strings.Split(*sizePrice.StepPrice, ","))
		if err != nil {
			logx.Error(err)
			return resp.SetStatusWithMessage(basic.CodeServiceErr, fmt.Sprintf("failed to parse step price:%d", *cart.SizeId))
		}
		lenStepPrice := len(stepPrice)
		if lenStepPrice == 0 || lenStepNum == 0 {
			return resp.SetStatusWithMessage(basic.CodeServiceErr, fmt.Sprintf("step price or step number is not set:%d ", *cart.SizeId))
		}
		//购买箱数
		boxQuantity := int(math.Ceil(float64(*cart.PurchaseQuantity) / float64(*sizePrice.EachBoxNum)))
		//获取阶梯数量
		stepQuantityList := make([]types.StepNumItem, 0, 10)
		tmpMinBuyNum := *sizePrice.MinBuyNum
		for tmpMinBuyNum < (int64(stepNum[lenStepNum-1]) + 5) {
			//阶梯数
			tmpQuantity := tmpMinBuyNum * (*sizePrice.EachBoxNum)
			stepQuantityList = append(stepQuantityList, types.StepNumItem{
				PurchaseQuantity: tmpQuantity,
				IsSelected:       *cart.PurchaseQuantity == tmpQuantity,
			})
			tmpMinBuyNum++
		}
		//根据数量获取阶梯价格中对应的价格
		itemPrice := step_price.GetCentStepPrice(boxQuantity, stepNum, stepPrice)
		//如果有配件，单价也要加入配件价格
		if *cart.FittingId > 0 {
			if curFittingInfo, ok := mapModel[*cart.FittingId]; ok {
				itemPrice += *curFittingInfo.Price
			}
		}
		totalPrice := itemPrice * (*cart.PurchaseQuantity)
		item := types.CartItem{
			ProductId: *cart.ProductId,
			SizeInfo: types.SizeInfo{
				SizeId:   *cart.SizeId,
				Capacity: snapShot.SizeInfo.Capacity,
				Title: types.SizeTitle{
					Cm:   snapShot.SizeInfo.Cm,
					Inch: snapShot.SizeInfo.Inch,
				},
			},
			FittingInfo: types.FittingInfo{
				FittingId:   *cart.FittingId,
				FittingName: snapShot.FittingInfo.FittingName,
			},
			ItemPrice:  fmt.Sprintf("%.3f", format.CentitoDollar(itemPrice)),
			TotalPrice: fmt.Sprintf("%.3f", format.CentitoDollar(totalPrice)),
			DiyInformation: types.DiyInformation{
				Phone:   snapShot.UserDiyInformation.Phone,
				Address: snapShot.UserDiyInformation.Address,
				Website: snapShot.UserDiyInformation.Website,
				Qrcode:  snapShot.UserDiyInformation.Qrcode,
				Slogan:  snapShot.UserDiyInformation.Slogan,
			},
			StepNum:            stepQuantityList,
			IsInvalid:          false,
			InvalidDescription: "",
		}
		//是否有失效的
		if description, ok := mapCartChange[cart.Id]; ok {
			item.IsInvalid = true
			item.InvalidDescription = description
		}
		list = append(list, item)
	}
	return resp.SetStatusWithMessage(basic.CodeOK, "success", types.GetCartsRsp{
		Meta: types.Meta{
			TotalCount:  total,
			PageCount:   int64(math.Ceil(float64(total) / float64(limit))),
			CurrentPage: req.CurrentPage,
			PerPage:     limit,
		},
		CartList: list,
	})
}

// 获取相关信息
type GetRelationInfoReq struct {
	Carts        []gmodel.FsShoppingCart
	MapSize      map[int64]gmodel.FsProductSize
	MapModel     map[int64]gmodel.FsProductModel3d
	MapTemplate  map[int64]gmodel.FsProductTemplateV2
	MapSizePrice map[int64]gmodel.FsProductPrice
}

func (l *GetCartsLogic) GetRelationInfo(req GetRelationInfoReq) error {
	lenCarts := len(req.Carts)
	templateIds := make([]int64, 0, lenCarts)
	modelIds := make([]int64, 0, lenCarts) //模型 + 配件
	sizeIds := make([]int64, 0, lenCarts)
	for index := range req.Carts {
		templateIds = append(templateIds, *req.Carts[index].TemplateId)
		modelIds = append(modelIds, *req.Carts[index].ModelId, *req.Carts[index].FittingId)
		sizeIds = append(sizeIds, *req.Carts[index].SizeId)
	}
	//获取尺寸列表
	sizeList, err := l.svcCtx.AllModels.FsProductSize.GetAllByIds(l.ctx, sizeIds, "")
	if err != nil {
		logx.Error(err)
		return errors.New("failed to get size list")
	}
	for _, v := range sizeList {
		req.MapSize[v.Id] = v
	}
	//获取模型和配件信息
	modelList, err := l.svcCtx.AllModels.FsProductModel3d.GetAllByIds(l.ctx, modelIds, "")
	if err != nil {
		logx.Error(err)
		return errors.New("failed to get model list")
	}
	for _, v := range modelList {
		req.MapModel[v.Id] = v
	}
	//获取模板列表
	templateList, err := l.svcCtx.AllModels.FsProductTemplateV2.FindAllByIds(l.ctx, templateIds)
	if err != nil {
		logx.Error(err)
		return errors.New("failed to get template list")
	}
	for _, v := range templateList {
		req.MapTemplate[v.Id] = v
	}
	//根据sizeid获取价格列表
	priceList, err := l.svcCtx.AllModels.FsProductPrice.GetPriceListBySizeIds(l.ctx, sizeIds)
	if err != nil {
		logx.Error(err)
		return errors.New("failed to get cart`s product price list")
	}
	for _, v := range priceList {
		req.MapSizePrice[*v.SizeId] = v
	}
	return nil
}

// 处理逻辑后 w,r 如:重定向, resp 必须重新处理
// func (l *GetCartsLogic) AfterLogic(w http.ResponseWriter, r *http.Request, resp *basic.Response) {
// // httpx.OkJsonCtx(r.Context(), w, resp)
// }