package usecase

import (
	"code.30cm.net/digimon/app-cloudep-product-service/pkg/domain/entity"
	"code.30cm.net/digimon/app-cloudep-product-service/pkg/domain/repository"
	"code.30cm.net/digimon/app-cloudep-product-service/pkg/domain/usecase"
	"code.30cm.net/digimon/app-cloudep-product-service/pkg/utils"
	"context"
	"github.com/zeromicro/go-zero/core/logx"
	"go.mongodb.org/mongo-driver/mongo"
	"go.mongodb.org/mongo-driver/mongo/options"
	"go.mongodb.org/mongo-driver/mongo/readconcern"

	"code.30cm.net/digimon/library-go/errs"
	"code.30cm.net/digimon/library-go/errs/code"
)

type ProductUseCaseParam struct {
	ProductRepo           repository.ProductRepository
	TagRepo               repository.TagRepo
	TagBinding            repository.TagBindingRepo
	ProductStatisticsRepo repository.ProductStatisticsRepo
}

type ProductUseCase struct {
	ProductUseCaseParam
}

func MustProductUseCase(param ProductUseCaseParam) usecase.ProductUseCase {
	return &ProductUseCase{
		param,
	}
}

func (use *ProductUseCase) Create(ctx context.Context, product *usecase.Product) error {
	// 資料前處理：準備 entity.Product 實體
	insert := &entity.Product{}

	if product.UID != nil {
		insert.UID = *product.UID
	}
	if product.Title != nil {
		insert.Title = *product.Title
	}
	if product.IsPublished != nil {
		insert.IsPublished = *product.IsPublished
	}
	if product.Category != nil {
		insert.Category = *product.Category
	}
	if product.ShortTitle != nil {
		insert.ShortTitle = product.ShortTitle
	}
	if product.Details != nil {
		insert.Details = product.Details
	}
	if product.ShortDescription != nil {
		insert.ShortDescription = *product.ShortDescription
	}
	if product.Slug != nil {
		insert.Slug = product.Slug
	}
	if product.Amount != 0 {
		insert.Amount = product.Amount
	}
	if product.StartTime != nil {
		st := utils.Rfc3339ToUnix(utils.ToValue(product.StartTime))
		insert.StartTime = &st
	}
	if product.EndTime != nil {
		et := utils.Rfc3339ToUnix(utils.ToValue(product.EndTime))
		insert.EndTime = &et
	}
	if len(product.Media) > 0 {
		medias := make([]entity.Media, 0, len(product.Media))
		for _, m := range product.Media {
			medias = append(medias, entity.Media{
				Sort: m.Sort,
				URL:  m.URL,
				Type: m.Type,
			})
		}
		insert.Media = medias
	}
	if len(product.CustomFields) > 0 {
		cf := make([]entity.CustomFields, 0, len(product.CustomFields))
		for _, field := range product.CustomFields {
			cf = append(cf, entity.CustomFields{
				Key:   field.Key,
				Value: field.Value,
			})
		}
		insert.CustomFields = cf
	}

	// Transaction 設定：只做必要寫入
	opts := options.Transaction().SetReadConcern(readconcern.Local())
	err := use.ProductRepo.Transaction(ctx, func(sessCtx mongo.SessionContext) (any, error) {
		// 插入 Product
		if err := use.ProductRepo.Insert(sessCtx, insert); err != nil {
			e := errs.DBError(code.CloudEPProduct, 0)
			return nil, err
		}

		// 插入 Product 統計資料
		if err := use.ProductStatisticsRepo.Create(sessCtx, &entity.ProductStatistics{
			ProductID:               insert.ID.Hex(),
			Orders:                  0,
			OrdersUpdateTime:        0,
			AverageRating:           0,
			AverageRatingUpdateTime: 0,
			FansCount:               0,
			FansCountUpdateTime:     0,
		}); err != nil {
			return nil, err
		}

		// 過濾 Tag
		// 綁定 Tags
		for _, tag := range product.Tags {
			if err := use.TagBinding.BindTag(sessCtx, &entity.TagsBindingTable{
				ReferenceID: insert.ID.Hex(),
				TagID:       tag,
			}); err != nil {
				logx.Errorf("failed to bind tag %s to product %s: %v", tag, insert.ID.Hex(), err)
				return nil, err
			}
		}

		return nil, nil
	}, opts)

	if err != nil {
		return err
	}

	return nil
}

func (use *ProductUseCase) Update(ctx context.Context, id string, product *usecase.Product) error {
	//TODO implement me
	panic("implement me")
}

func (use *ProductUseCase) Delete(ctx context.Context, id string) error {
	//TODO implement me
	panic("implement me")
}

func (use *ProductUseCase) Get(ctx context.Context, id string) (*usecase.ProductResp, error) {
	//TODO implement me
	panic("implement me")
}

func (use *ProductUseCase) List(ctx context.Context, data usecase.ProductQueryParams) ([]*usecase.ProductResp, int64, error) {
	//TODO implement me
	panic("implement me")
}

func (use *ProductUseCase) IncOrders(ctx context.Context, productID string, count int64) error {
	//TODO implement me
	panic("implement me")
}

func (use *ProductUseCase) DecOrders(ctx context.Context, productID string, count int64) error {
	//TODO implement me
	panic("implement me")
}

func (use *ProductUseCase) UpdateAverageRating(ctx context.Context, productID string, averageRating float64) error {
	//TODO implement me
	panic("implement me")
}

func (use *ProductUseCase) IncFansCount(ctx context.Context, productID string, fansCount uint64) error {
	//TODO implement me
	panic("implement me")
}

func (use *ProductUseCase) DecFansCount(ctx context.Context, productID string, fansCount uint64) error {
	//TODO implement me
	panic("implement me")
}

func (use *ProductUseCase) BindTag(ctx context.Context, binding usecase.TagsBindingTable) error {
	//TODO implement me
	panic("implement me")
}

func (use *ProductUseCase) UnbindTag(ctx context.Context, binding usecase.TagsBindingTable) error {
	//TODO implement me
	panic("implement me")
}

func (use *ProductUseCase) GetBindingsByReference(ctx context.Context, referenceID string) ([]usecase.TagsBindingTableResp, error) {
	//TODO implement me
	panic("implement me")
}

func (use *ProductUseCase) ListTagBinding(ctx context.Context, params usecase.TagBindingQueryParams) ([]usecase.TagsBindingTableResp, int64, error) {
	//TODO implement me
	panic("implement me")
}