package logic

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

	"fusenapi/server/product/internal/svc"
	"fusenapi/server/product/internal/types"

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

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

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

// 获取分类下的产品以及尺寸
func (l *GetSizeByProductLogic) GetSizeByProduct(req *types.Request, userinfo *auth.UserInfo) (resp *basic.Response) {
	if userinfo.GetIdType() != auth.IDTYPE_User {
		return resp.SetStatusWithMessage(basic.CodeUnAuth, "please sign in first")
	}
	//获取所有网站目录
	tagsModel := gmodel.NewFsTagsModel(l.svcCtx.MysqlConn)
	tagsList, err := tagsModel.GetAllByLevel(l.ctx, constants.TYPE_WEBSITE)
	if err != nil {
		logx.Error(err)
		return resp.SetStatusWithMessage(basic.CodeServiceErr, "failed to get website tags")
	}
	if len(tagsList) == 0 {
		return resp.SetStatusWithMessage(basic.CodeOK, "tag list is null")
	}
	tagIds := make([]int64, 0, len(tagsList))
	for _, v := range tagsList {
		tagIds = append(tagIds, v.Id)
	}
	//获取这些类型的产品
	productModel := gmodel.NewFsProductModel(l.svcCtx.MysqlConn)
	productList, err := productModel.GetProductListByIds(l.ctx, tagIds, "sort-desc")
	if err != nil {
		logx.Error(err)
		return resp.SetStatusWithMessage(basic.CodeServiceErr, "failed to get tag product list")
	}
	productIds := make([]int64, 0, len(productList))
	for _, v := range productList {
		productIds = append(productIds, v.Id)
	}
	productSizeModel := gmodel.NewFsProductSizeModel(l.svcCtx.MysqlConn)
	productSizeList, err := productSizeModel.GetAllByProductIds(l.ctx, productIds, "sort DESC")
	if err != nil {
		logx.Error(err)
		return resp.SetStatusWithMessage(basic.CodeServiceErr, "failed to get product size list")
	}
	sizeIds := make([]int64, 0, len(productSizeList))
	for _, v := range productSizeList {
		sizeIds = append(sizeIds, v.Id)
	}
	//获取价格列表
	productPriceModel := gmodel.NewFsProductPriceModel(l.svcCtx.MysqlConn)
	productPriceList, err := productPriceModel.GetPriceListBySizeIds(l.ctx, sizeIds)
	if err != nil {
		logx.Error(err)
		return resp.SetStatusWithMessage(basic.CodeServiceErr, "failed to get product proce list")
	}
	mapProductPrice := make(map[int64]gmodel.FsProductPrice)
	for _, v := range productPriceList {
		mapProductPrice[*v.SizeId] = v
	}
	//组装返回
	list := make([]types.GetSizeByProductRsp, 0, len(tagsList))
	for _, tag := range tagsList {
		//获取第一层子类
		firstChildrenList, err := l.GetFirstChildrenList(tag, productList, productSizeList, mapProductPrice)
		if err != nil {
			logx.Error(err)
			return resp.SetStatusWithMessage(basic.CodeServiceErr, "failed to get first level children  list")
		}
		data := types.GetSizeByProductRsp{
			Id:       tag.Id,
			Name:     *tag.Title,
			Children: firstChildrenList,
		}
		list = append(list, data)
	}
	return resp.SetStatusWithMessage(basic.CodeOK, "success", list)
}

// 第一层子层
func (l *GetSizeByProductLogic) GetFirstChildrenList(tag gmodel.FsTags, productList []gmodel.FsProduct, productSizeList []gmodel.FsProductSize, mapProductPrice map[int64]gmodel.FsProductPrice) (childrenList []types.Children, err error) {
	childrenList = make([]types.Children, 0, len(productList))
	for _, product := range productList {
		if *product.Type != tag.Id {
			continue
		}
		childrenObjList, err := l.GetSecondChildrenList(product, productSizeList, mapProductPrice)
		if err != nil {
			return nil, err
		}
		//获取第二层子类
		data := types.Children{
			Id:           product.Id,
			Name:         *product.Title,
			Cycle:        int(*product.DeliveryDays + *product.ProduceDays),
			ChildrenList: childrenObjList,
		}
		childrenList = append(childrenList, data)
	}
	return
}

// 第2层子层
func (l *GetSizeByProductLogic) GetSecondChildrenList(product gmodel.FsProduct, productSizeList []gmodel.FsProductSize, mapProductPrice map[int64]gmodel.FsProductPrice) (childrenObjList []types.ChildrenObj, err error) {
	childrenObjList = make([]types.ChildrenObj, 0, len(productSizeList))
	for _, productSize := range productSizeList {
		if product.Id != *productSize.ProductId {
			continue
		}
		priceList := make([]types.PriceObj, 0, len(productSizeList))
		price, ok := mapProductPrice[productSize.Id]
		//无对应尺寸价格
		if !ok {
			priceList = []types.PriceObj{
				{Num: 1, Price: 0},
				{Num: 1, Price: 0},
				{Num: 1, Price: 0},
			}
			childrenObjList = append(childrenObjList, types.ChildrenObj{
				Id:        productSize.Id,
				Name:      *productSize.Capacity,
				PriceList: priceList,
			})
			continue
		}
		if price.StepNum == nil || price.StepPrice == nil {
			continue
		}
		*price.StepNum = strings.Trim(*price.StepNum, " ")
		*price.StepPrice = strings.Trim(*price.StepPrice, " ")

		//阶梯数量切片
		stepNum, err := format.StrSlicToIntSlice(strings.Split(*price.StepNum, ","))
		if err != nil {
			return nil, err
		}
		//阶梯价格切片
		stepPrice, err := format.StrSlicToIntSlice(strings.Split(*price.StepPrice, ","))
		if err != nil {
			return nil, err
		}
		if len(stepNum) == 0 || len(stepPrice) == 0 {
			return nil, errors.New(fmt.Sprintf("stepNum count or stepPrice count is empty: product size id :%d ,product price id :%d", productSize.Id, price.Id))
		}
		index := 0
		// 最小购买数量小于 最大阶梯数量+5
		for int(*price.MinBuyNum) < (stepNum[len(stepNum)-1]+5) && index < 3 {
			priceList = append(priceList, types.PriceObj{
				Num:   int(*price.MinBuyNum * *price.EachBoxNum),
				Price: step_price.GetStepPrice(int(*price.MinBuyNum), stepNum, stepPrice),
			})
			*price.MinBuyNum++
			index++
		}
		data := types.ChildrenObj{
			Id:        productSize.Id,
			Name:      *productSize.Capacity,
			PriceList: priceList,
		}
		childrenObjList = append(childrenObjList, data)
	}
	return
}