package logic

import (
	"context"
	"encoding/json"
	"errors"
	"fmt"
	"fusenapi/constants"
	"fusenapi/model/gmodel"
	"fusenapi/server/shopping-cart/internal/svc"
	"fusenapi/server/shopping-cart/internal/types"
	"fusenapi/service/repositories"
	"fusenapi/utils/auth"
	"fusenapi/utils/basic"
	"fusenapi/utils/format"
	"fusenapi/utils/s3url_to_s3id"
	"math"

	"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) {
	if !userinfo.IsUser() {
		return resp.SetStatusWithMessage(basic.CodeUnAuth, "please sign in")
	}
	currentPage := constants.DEFAULT_PAGE
	limit := 1000
	//获取用户购物车列表
	var cartIds []int64
	if req.CartId > 0 {
		cartIds = append(cartIds, req.CartId)
	}
	carts, total, err := l.svcCtx.AllModels.FsShoppingCart.GetAllCartsByParam(l.ctx, gmodel.GetAllCartsByParamReq{
		Ids:    cartIds,
		UserId: userinfo.UserId,
		Sort:   "id DESC",
		Page:   currentPage,
		Limit:  limit,
	})
	if err != nil {
		logx.Error(err)
		return resp.SetStatusWithMessage(basic.CodeDbSqlErr, "system err:failed to get your shopping carts")
	}
	var (
		mapSize             = make(map[int64]gmodel.FsProductSize)
		mapModel            = make(map[int64]gmodel.FsProductModel3d)
		mapTemplate         = make(map[int64]gmodel.FsProductTemplateV2)
		mapProduct          = make(map[int64]gmodel.FsProduct)
		mapResourceMetadata = make(map[string]interface{})
	)
	//获取相关信息
	err = l.GetRelationInfo(GetRelationInfoReq{
		Carts:               carts,
		MapSize:             mapSize,
		MapModel:            mapModel,
		MapTemplate:         mapTemplate,
		MapProduct:          mapProduct,
		MapResourceMetadata: mapResourceMetadata,
	})
	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]gmodel.CartSnapshot)
	//校验购物车数据是否变更
	err = l.svcCtx.Repositories.NewShoppingCart.VerifyShoppingCartSnapshotDataChange(repositories.VerifyShoppingCartSnapshotDataChangeReq{
		Carts:         carts,
		MapSize:       mapSize,
		MapModel:      mapModel,
		MapTemplate:   mapTemplate,
		MapCartChange: mapCartChange,
		MapSnapshot:   mapSnapshot,
		MapProduct:    mapProduct,
	})
	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]
		modelInfo, ok := mapModel[*cart.ModelId]
		if !ok {
			return resp.SetStatusWithMessage(basic.CodeServiceErr, fmt.Sprintf("the size`s model info is not exists:%d_%d", *cart.ProductId, *cart.SizeId))
		}
		var stepPrice gmodel.StepPriceJsonStruct
		if modelInfo.StepPrice != nil && len(*modelInfo.StepPrice) != 0 {
			if err = json.Unmarshal(*modelInfo.StepPrice, &stepPrice); err != nil {
				logx.Error(err)
				return resp.SetStatusWithMessage(basic.CodeJsonErr, fmt.Sprintf("failed to parse model step price:%d", *cart.ModelId))
			}
		}
		//购买数量步进量
		stepPurchaseQuantity := *modelInfo.PackedUnit
		//如果有配件，单价也要加入配件价格
		fittingPrice := int64(0)
		if *cart.FittingId > 0 {
			curFittingInfo, ok := mapModel[*cart.FittingId]
			if ok {
				fittingPrice = *curFittingInfo.Price
				//取大的为步进量基数
				if *curFittingInfo.PackedUnit > stepPurchaseQuantity {
					stepPurchaseQuantity = *curFittingInfo.PackedUnit
				}
			}
			logx.Error(fmt.Sprintf("cart contain some one witch lose fitting:%d", *cart.FittingId))
		}
		//计算阶梯价格
		totalPrice, itemPrice, err := l.svcCtx.Repositories.NewShoppingCart.CaculateStepPrice(*cart.PurchaseQuantity, stepPrice, fittingPrice)
		if err != nil {
			logx.Error(err)
			return resp.SetStatusWithMessage(basic.CodeServiceErr, err.Error())
		}
		//尺寸信息
		sizeCapacity := snapShot.SizeInfo.Capacity
		if sizeInfo, ok := mapSize[*cart.SizeId]; ok {
			sizeCapacity = *sizeInfo.Capacity
		}
		//配件信息
		fittingName := snapShot.FittingInfo.FittingName
		if fittingInfo, ok := mapModel[*cart.FittingId]; ok {
			fittingName = *fittingInfo.Name
		}
		productCover := "" //产品封面图
		productName := snapShot.ProductInfo.ProductName
		productSn := snapShot.ProductInfo.ProductSn
		//产品封面图资源元数据
		var productCoverMetadata interface{}
		cartIsSelected := *cart.IsSelected > 0
		//产品信息
		if productInfo, ok := mapProduct[*cart.ProductId]; ok {
			productCover = *productInfo.Cover
			productName = *productInfo.Title
			productSn = *productInfo.Sn
			if metadata, ok := mapResourceMetadata[*productInfo.Cover]; ok {
				productCoverMetadata = metadata
			}
			//产品下架了
			if *productInfo.IsShelf == 0 {
				cartIsSelected = false
			}
		}
		templateTag := ""
		if templateInfo, ok := mapTemplate[*cart.TemplateId]; ok {
			templateTag = *templateInfo.TemplateTag
		}
		item := types.CartItem{
			CartId: cart.Id,
			ProductInfo: types.ProductInfo{
				ProductId:            *cart.ProductId,
				ProductName:          productName,
				ProductSn:            productSn,
				ProductCover:         productCover,
				ProductCoverMetadata: productCoverMetadata,
			},
			SizeInfo: types.SizeInfo{
				SizeId:   *cart.SizeId,
				Capacity: sizeCapacity,
				Title: types.SizeTitle{
					Cm:   snapShot.SizeInfo.Cm,
					Inch: snapShot.SizeInfo.Inch,
				},
			},
			FittingInfo: types.FittingInfo{
				FittingId:   *cart.FittingId,
				FittingName: fittingName,
			},
			ItemPrice:  format.NumToStringWithThousandthPercentile(format.CentitoDollar(itemPrice, 3)),
			TotalPrice: format.NumToStringWithThousandthPercentile(format.CentitoDollarWithNoHalfAdjust(totalPrice, 2)),
			DiyInformation: types.DiyInformation{
				Phone:   snapShot.UserDiyInformation.Phone,
				Address: snapShot.UserDiyInformation.Address,
				Website: snapShot.UserDiyInformation.Website,
				Qrcode:  snapShot.UserDiyInformation.Qrcode,
				Slogan:  snapShot.UserDiyInformation.Slogan,
			},
			PurchaseQuantity:     *cart.PurchaseQuantity,
			MinPurchaseQuantity:  stepPrice.MinBuyUnitsNum,
			StepPurchaseQuantity: stepPurchaseQuantity,
			IsHighlyCustomized:   *cart.IsHighlyCustomized,
			IsSelected:           cartIsSelected,
			TemplateTag:          templateTag,
			Logo:                 snapShot.Logo,
			RenderImage:          snapShot.RenderImage,
			SelectColorIndex:     snapShot.TemplateInfo.SelectColorIndex,
		}
		//是否有失效的
		if description, ok := mapCartChange[cart.Id]; ok {
			item.IsInvalid = true
			item.InvalidDescription = description
			//失效了返回给前端也是不选中
			item.IsSelected = false
		}
		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: 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
	MapProduct          map[int64]gmodel.FsProduct
	MapResourceMetadata map[string]interface{}
}

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)
	productIds := 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)
		productIds = append(productIds, *req.Carts[index].ProductId)
	}
	//获取产品集合
	productList, err := l.svcCtx.AllModels.FsProduct.GetProductListByIds(l.ctx, productIds, "")
	if err != nil {
		logx.Error(err)
		return errors.New("failed to get product list")
	}
	resourceIds := make([]string, 0, len(productList))
	for _, v := range productList {
		req.MapProduct[v.Id] = v
		resourceIds = append(resourceIds, s3url_to_s3id.GetS3ResourceIdFormUrl(*v.Cover))
	}
	//根据resourceUrls找到对应的元数据
	resourceMetadataList, err := l.svcCtx.AllModels.FsResource.FindAllByResourceIds(l.ctx, resourceIds)
	if err != nil {
		logx.Error(err)
		return errors.New("failed to get resource list")
	}
	for _, v := range resourceMetadataList {
		var metadata interface{}
		if v.Metadata != nil {
			_ = json.Unmarshal(*v.Metadata, &metadata)
		}
		req.MapResourceMetadata[*v.ResourceUrl] = metadata
	}
	//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
	}
	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)
// }