package service

import (
	"context"

	"git.lzcwy.cn/zhengchiliu/zt-closet-backend/global"
	"git.lzcwy.cn/zhengchiliu/zt-closet-backend/internal/dto"
	"git.lzcwy.cn/zhengchiliu/zt-closet-backend/internal/mysqldao"
	"git.lzcwy.cn/zhengchiliu/zt-closet-backend/internal/mysqlmodel"
	"git.lzcwy.cn/zhengchiliu/zt-closet-backend/pkg/errcode"
)

// GoodsService 商品业务服务。
type GoodsService struct {
	goodsDao *mysqldao.GoodsDao
}

// NewGoodsService 创建商品服务。
func NewGoodsService() *GoodsService {
	return &GoodsService{
		goodsDao: mysqldao.NewGoodsDao(),
	}
}

// GetByCode 按商品编码查询商品（下架返回错误）。
func (s *GoodsService) GetByCode(ctx context.Context, request *dto.GoodsGetByCodeRequest) (*dto.GoodsGetByCodeResponse, *errcode.Error) {
	ctx, span := global.Tracer.Start(ctx, "svc.GoodsGetByCode")
	defer span.End()

	goods, err := s.goodsDao.GoodsGetByCode(ctx, request.GoodsCode)
	if err != nil {
		if isNotFound(err) {
			return nil, errcode.GoodsNotFound
		}
		return nil, errcode.DatabaseError
	}
	if goods.Status != GoodsStatusOnShelf {
		return nil, errcode.GoodsOffShelf
	}
	response := buildGoodsResponse(goods)
	return &response, nil
}

// List 分页查询上架商品（按类型过滤）。
func (s *GoodsService) List(ctx context.Context, request *dto.GoodsListRequest) (*dto.GoodsListResponse, *errcode.Error) {
	ctx, span := global.Tracer.Start(ctx, "svc.GoodsList")
	defer span.End()

	page, pageSize := normalizePage(request.Page, request.PageSize)

	list, total, err := s.goodsDao.GoodsList(ctx, request.GoodsType, page, pageSize)
	if err != nil {
		return nil, errcode.DatabaseError
	}

	items := make([]dto.GoodsGetByCodeResponse, 0, len(list))
	for i := range list {
		items = append(items, buildGoodsResponse(&list[i]))
	}

	return &dto.GoodsListResponse{
		PageResponse: dto.PageResponse{Total: total, Page: page, PageSize: pageSize},
		List:         items,
	}, nil
}

// buildGoodsResponse 将商品模型映射为响应。注意 dto.UploadQuota 对应 model.CosQuota。
func buildGoodsResponse(g *mysqlmodel.Goods) dto.GoodsGetByCodeResponse {
	return dto.GoodsGetByCodeResponse{
		ID:               g.ID,
		GoodsCode:        g.GoodsCode,
		GoodsName:        g.GoodsName,
		GoodsType:        g.GoodsType,
		Price:            g.Price,
		DiscountPrice:    g.DiscountPrice,
		MemberDays:       g.MemberDays,
		UploadQuota:      g.CosQuota,
		AIRecommendQuota: g.AIRecommendQuota,
		ClosetShareQuota: g.ClosetShareQuota,
		OutfitShareQuota: g.OutfitShareQuota,
		ValidDays:        g.ValidDays,
		Description:      g.Description,
	}
}