package logic

import (
	"encoding/json"
	"errors"
	"fusenapi/model/gmodel"
	"fusenapi/utils/auth"
	"fusenapi/utils/basic"
	"fusenapi/utils/format"
	"fusenapi/utils/image"
	"fusenapi/utils/s3url_to_s3id"
	"gorm.io/gorm"
	"strings"

	"context"

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

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

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

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

func (l *GetRecommandProductListLogic) GetRecommandProductList(req *types.GetRecommandProductListReq, userinfo *auth.UserInfo) (resp *basic.Response) {
	req.Num = 4 //写死4个
	if req.Size > 0 {
		req.Size = int32(image.GetCurrentSize(uint32(req.Size)))
	}
	productInfo, err := l.svcCtx.AllModels.FsProduct.FindOneBySn(l.ctx, req.Sn)
	if err != nil {
		if errors.Is(err, gorm.ErrRecordNotFound) {
			return resp.SetStatusWithMessage(basic.CodeDbRecordNotFoundErr, "detail`s product is not found")
		}
		logx.Error(err)
		return resp.SetStatusWithMessage(basic.CodeDbSqlErr, "failed to get detail product info")
	}
	var (
		recommendProductList []gmodel.FsProduct
	)
	if productInfo.RecommendProduct != nil && *productInfo.RecommendProduct != "" {
		recommendProductIds, err := format.StrSlicToInt64Slice(strings.Split(*productInfo.RecommendProduct, ","))
		if err != nil {
			logx.Error(err)
			return resp.SetStatusWithMessage(basic.CodeServiceErr, "failed to split recommend product ids")
		}
		recommendProductList, err = l.svcCtx.AllModels.FsProduct.GetProductListByIds(l.ctx, recommendProductIds, "")
		if err != nil {
			logx.Error(err)
			return resp.SetStatusWithMessage(basic.CodeDbSqlErr, "failed to get recommend product list")
		}
	}
	//资源id集合
	resourceIds := make([]string, 0, 50)
	//需要填充时需要忽略的id
	ignoreProductIds := make([]int64, 0, len(recommendProductList))
	productIds := make([]int64, 0, len(recommendProductList))
	//在合并之前记住推荐的产品
	mapRecommend := make(map[int64]struct{})
	for _, v := range recommendProductList {
		ignoreProductIds = append(ignoreProductIds, v.Id)
		productIds = append(productIds, v.Id)
		mapRecommend[v.Id] = struct{}{}
		resourceIds = append(resourceIds, s3url_to_s3id.GetS3ResourceIdFormUrl(*v.Cover))
		resourceIds = append(resourceIds, s3url_to_s3id.GetS3ResourceIdFormUrl(*v.CoverImg))
	}
	//小于请求的数量则需要从产品表中随机填补上(不包含上面的产品)
	lenRecommendProduct := len(recommendProductList)
	if lenRecommendProduct < int(req.Num) {
		appendNum := int(req.Num) - lenRecommendProduct
		productList, err := l.svcCtx.AllModels.FsProduct.GetIgnoreRandomProductList(l.ctx, appendNum, ignoreProductIds)
		if err != nil {
			logx.Error(err)
			return resp.SetStatusWithMessage(basic.CodeDbSqlErr, "failed to get product list")
		}
		//合并列表
		for _, v := range productList {
			productIds = append(productIds, v.Id)
			recommendProductList = append(recommendProductList, v)
		}
	}
	//获取产品最低价
	mapProductMinPrice := make(map[int64]int64)
	if err = l.svcCtx.AllModels.FsProductModel3d.GetProductMinPrice(l.ctx, productIds, mapProductMinPrice); err != nil {
		logx.Error(err)
		return resp.SetStatusWithMessage(basic.CodeDbSqlErr, "failed to get product min price")
	}
	//获取产品标签相关属性
	productTagPropList, err := l.svcCtx.AllModels.FsProductTagProp.GetTagPropByProductIdsWithProductTag(l.ctx, productIds)
	if err != nil {
		logx.Error(err)
		return resp.SetStatusWithMessage(basic.CodeDbSqlErr, "failed to get product tag property")
	}
	for _, v := range productTagPropList {
		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 resp.SetStatusWithMessage(basic.CodeDbSqlErr, "failed to get resource list")
	}
	mapResourceMetadata := make(map[string]map[string]interface{})
	for _, v := range resourceMetadataList {
		var metadata map[string]interface{}
		if v.Metadata != nil {
			_ = json.Unmarshal(*v.Metadata, &metadata)
		}
		mapResourceMetadata[*v.ResourceUrl] = metadata
	}
	mapTagProp := make(map[int64][]types.CoverDefaultItem)
	for _, v := range productTagPropList {
		mapTagProp[*v.ProductId] = append(mapTagProp[*v.ProductId], types.CoverDefaultItem{
			TemplateTag:   v.TemplateTag,
			Cover:         *v.Cover,
			CoverMetadata: mapResourceMetadata[*v.Cover],
		})
	}
	list := make([]types.GetRecommandProductListRsp, 0, len(recommendProductList))
	for _, v := range recommendProductList {
		recommend := false
		if _, ok := mapRecommend[v.Id]; ok {
			recommend = true
		}
		minPrice := int64(0)
		if minVal, ok := mapProductMinPrice[v.Id]; ok {
			minPrice = minVal
		}
		item := types.GetRecommandProductListRsp{
			Id:               v.Id,
			Sn:               *v.Sn,
			Title:            *v.Title,
			TitleCn:          *v.TitleCn,
			Cover:            *v.Cover,
			CoverMetadata:    mapResourceMetadata[*v.Cover],
			CoverImg:         *v.CoverImg,
			CoverImgMetadata: mapResourceMetadata[*v.CoverImg],
			CoverDefault:     []types.CoverDefaultItem{},
			Intro:            *v.Intro,
			Recommend:        recommend,
			MinPrice:         minPrice,
			IsCustomization:  *v.IsCustomization,
		}
		if _, ok := mapTagProp[productInfo.Id]; ok {
			item.CoverDefault = mapTagProp[productInfo.Id]
		}
		list = append(list, item)
	}
	return resp.SetStatusWithMessage(basic.CodeOK, "success", list)
}