app-cloudep-product-service/pkg/usecase/product.go

package usecase

import (
	"context"
	"errors"

	"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"
	repo "code.30cm.net/digimon/app-cloudep-product-service/pkg/repository"
	"code.30cm.net/digimon/app-cloudep-product-service/pkg/utils"
	"code.30cm.net/digimon/library-go/errs"
	"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"
)

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 {
	insert := convertUseCaseToEntity(product)
	// Transaction 設定：只做必要寫入
	opts := options.Transaction().SetReadConcern(readconcern.Local())
	//nolint:contextcheck
	err := use.ProductRepo.Transaction(ctx, func(sessCtx mongo.SessionContext) (any, error) {
		if err := use.ProductRepo.Insert(sessCtx, insert); err != nil {
			return nil, logDBError(ctx, "ProductRepo.Insert", []logx.LogField{{Key: "req", Value: product}}, err, "failed to create product")
		}

		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, logDBError(ctx, "ProductStatisticsRepo.Create", []logx.LogField{{Key: "ProductID", Value: insert.ID.Hex()}}, err, "failed to create product statistics")
		}

		tagsBinding := buildTagsBinding(insert.ID.Hex(), product.Tags)
		if err := use.TagBinding.BindTags(sessCtx, tagsBinding); err != nil {
			return nil, logDBError(ctx, "TagBinding.BindTags", []logx.LogField{{Key: "ReferenceID", Value: insert.ID.Hex()}, {Key: "tags", Value: product.Tags}}, err, "failed to bind product tags")
		}

		return struct{}{}, nil
	}, opts)

	if err != nil {
		return err
	}

	return nil
}

func (use *ProductUseCase) Update(ctx context.Context, id string, product *usecase.Product) error {
	update := convertUseCaseToUpdateParams(product)
	tagsBinding := buildTagsBinding(id, product.Tags)
	opts := options.Transaction().SetReadConcern(readconcern.Local())
	err := use.ProductRepo.Transaction(ctx, func(sessCtx mongo.SessionContext) (any, error) {
		//nolint:contextcheck
		_, err := use.ProductRepo.Update(sessCtx, id, update)
		if err != nil {
			return nil, logDBError(ctx, "ProductRepo.Update", []logx.LogField{{Key: "req", Value: product}}, err, "failed to update product")
		}
		//nolint:contextcheck
		if err := use.TagBinding.UnbindTagByReferenceID(sessCtx, id); err != nil {
			return nil, logDBError(ctx, "TagBinding.UnbindTagByReferenceID", []logx.LogField{{Key: "ReferenceID", Value: id}}, err, "failed to unbind tags")
		}
		//nolint:contextcheck
		if err := use.TagBinding.BindTags(sessCtx, tagsBinding); err != nil {
			return nil, logDBError(ctx, "TagBinding.BindTags", []logx.LogField{{Key: "ReferenceID", Value: id}, {Key: "tags", Value: product.Tags}}, err, "failed to bind tags")
		}

		return struct{}{}, nil
	}, opts)

	return err
}

func (use *ProductUseCase) Delete(ctx context.Context, id string) error {
	// 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) {
		//nolint:contextcheck
		err := use.ProductRepo.Delete(sessCtx, id)
		if err != nil {
			e := errs.DBErrorL(logx.WithContext(ctx),
				[]logx.LogField{
					{Key: "ReferenceID", Value: id},
					{Key: "func", Value: "ProductRepo.Delete"},
					{Key: "err", Value: err.Error()},
				}, "failed to delete product")

			return nil, e
		}
		//nolint:contextcheck
		err = use.TagRepo.UnbindTagByReferenceID(sessCtx, id)
		if err != nil {
			e := errs.DBErrorL(logx.WithContext(ctx),
				[]logx.LogField{
					{Key: "ReferenceID", Value: id},
					{Key: "func", Value: "TagBinding.UnbindTagByReferenceID"},
					{Key: "err", Value: err.Error()},
				}, "failed to unbind tags")

			return nil, e
		}

		return struct{}{}, nil
	}, opts)
	if err != nil {
		return err
	}

	return nil
}

func (use *ProductUseCase) Get(ctx context.Context, id string) (*usecase.ProductResp, error) {
	product, err := use.ProductRepo.FindOneByID(ctx, id)
	if err != nil {
		return nil, logDBError(ctx, "ProductRepo.FindOneByID", []logx.LogField{{Key: "product_id", Value: id}}, err, "failed to find product")
	}
	stats, err := use.ProductStatisticsRepo.GetByID(ctx, id)
	if err != nil {
		return nil, logDBError(ctx, "ProductStatisticsRepo.GetByID", []logx.LogField{{Key: "product_id", Value: id}}, err, "failed to get product statistics")
	}
	bindings, err := use.TagRepo.GetBindingsByReference(ctx, id)
	if err != nil {
		return nil, logDBError(ctx, "TagRepo.GetBindingsByReference", []logx.LogField{{Key: "product_id", Value: id}}, err, "failed to get tag bindings")
	}
	tagIDs := make([]string, 0, len(bindings))
	for _, item := range bindings {
		tagIDs = append(tagIDs, item.TagID)
	}
	tags, err := use.TagRepo.GetByIDs(ctx, tagIDs)
	if err != nil {
		return nil, logDBError(ctx, "TagRepo.GetByIDs", []logx.LogField{{Key: "product_id", Value: id}}, err, "failed to get tags")
	}

	return convertEntityToResp(product, stats, tags), nil
}

// TODO 效能有問題這邊優先改，List 會有N + 1  問題

func (use *ProductUseCase) List(ctx context.Context, data usecase.ProductQueryParams) ([]*usecase.ProductResp, int64, error) {
	query := &repository.ProductQueryParams{
		PageSize:  data.PageSize,
		PageIndex: data.PageIndex,
	}

	if data.Slug != nil {
		query.Slug = data.Slug
	}
	if data.UID != nil {
		query.UID = data.UID
	}
	if data.IsPublished != nil {
		query.IsPublished = data.IsPublished
	}
	if data.Category != nil {
		query.Category = data.Category
	}
	if data.StartTime != nil {
		query.StartTime = data.StartTime
	}
	if data.EndTime != nil {
		query.EndTime = data.EndTime
	}

	products, total, err := use.ProductRepo.ListProduct(ctx, query)
	if err != nil {
		return nil, 0, err
	}

	result := make([]*usecase.ProductResp, 0, len(products))
	for _, p := range products {
		// 查詢統計資料
		stats, _ := use.ProductStatisticsRepo.GetByID(ctx, p.ID.Hex())

		// 查詢 Tag 資訊
		tags, _ := use.TagRepo.GetBindingsByReference(ctx, p.ID.Hex())
		tagIDs := make([]string, 0, len(tags))
		for _, t := range tags {
			tagIDs = append(tagIDs, t.TagID)
		}
		tagsInfo, _ := use.TagRepo.GetByIDs(ctx, tagIDs)

		// 組合 Tags 回應
		respTags := make([]usecase.Tags, 0, len(tagsInfo))
		for _, tag := range tagsInfo {
			item := usecase.Tags{
				ID:        tag.ID.Hex(),
				Types:     tag.Types,
				Name:      tag.Name,
				ShowType:  tag.ShowType,
				UpdatedAt: utils.UnixToRfc3339(tag.UpdatedAt),
				CreatedAt: utils.UnixToRfc3339(tag.CreatedAt),
			}
			if tag.Cover != nil {
				item.Cover = *tag.Cover
			}
			respTags = append(respTags, item)
		}

		// Media & CustomFields
		media := make([]usecase.Media, 0, len(p.Media))
		for _, m := range p.Media {
			media = append(media, usecase.Media{
				Sort: m.Sort,
				URL:  m.URL,
				Type: m.Type,
			})
		}

		customFields := make([]usecase.CustomFields, 0, len(p.CustomFields))
		for _, f := range p.CustomFields {
			customFields = append(customFields, usecase.CustomFields{
				Key:   f.Key,
				Value: f.Value,
			})
		}

		resp := &usecase.ProductResp{
			ID:                      p.ID.Hex(),
			UID:                     p.UID,
			Title:                   p.Title,
			ShortTitle:              utils.ToValue(p.ShortTitle),
			Details:                 utils.ToValue(p.Details),
			ShortDescription:        p.ShortDescription,
			Media:                   media,
			Slug:                    utils.ToValue(p.Slug),
			IsPublished:             p.IsPublished,
			Amount:                  p.Amount,
			StartTime:               utils.UnixToRfc3339(utils.ToValue(p.StartTime)),
			EndTime:                 utils.UnixToRfc3339(utils.ToValue(p.EndTime)),
			Category:                p.Category,
			CustomFields:            customFields,
			Tags:                    respTags,
			Orders:                  stats.Orders,
			OrdersUpdateTime:        utils.UnixToRfc3339(stats.OrdersUpdateTime),
			AverageRating:           stats.AverageRating,
			AverageRatingUpdateTime: utils.UnixToRfc3339(stats.AverageRatingUpdateTime),
			FansCount:               stats.FansCount,
			FansCountUpdateTime:     utils.UnixToRfc3339(stats.FansCountUpdateTime),
			UpdatedAt:               utils.UnixToRfc3339(p.UpdatedAt),
			CreatedAt:               utils.UnixToRfc3339(p.CreatedAt),
		}

		result = append(result, resp)
	}

	return result, total, nil
}

func (use *ProductUseCase) IncOrders(ctx context.Context, productID string, count int64) error {
	err := use.ProductStatisticsRepo.IncOrders(ctx, productID, count)
	if err != nil {
		return errs.DBErrorL(logx.WithContext(ctx),
			[]logx.LogField{
				{Key: "product_id", Value: productID},
				{Key: "func", Value: "ProductStatisticsRepo.IncOrders"},
				{Key: "err", Value: err.Error()},
			}, "failed to inc order")
	}

	return nil
}

func (use *ProductUseCase) DecOrders(ctx context.Context, productID string, count int64) error {
	err := use.ProductStatisticsRepo.DecOrders(ctx, productID, count)
	if err != nil {
		return errs.DBErrorL(logx.WithContext(ctx),
			[]logx.LogField{
				{Key: "product_id", Value: productID},
				{Key: "func", Value: "ProductStatisticsRepo.DecOrders"},
				{Key: "err", Value: err.Error()},
			}, "failed to dec order")
	}

	return nil
}

func (use *ProductUseCase) UpdateAverageRating(ctx context.Context, productID string, averageRating float64) error {
	err := use.ProductStatisticsRepo.UpdateAverageRating(ctx, productID, averageRating)
	if err != nil {
		return errs.DBErrorL(logx.WithContext(ctx),
			[]logx.LogField{
				{Key: "product_id", Value: productID},
				{Key: "func", Value: "ProductStatisticsRepo.UpdateAverageRating"},
				{Key: "err", Value: err.Error()},
			}, "failed to update average rating")
	}

	return nil
}

func (use *ProductUseCase) IncFansCount(ctx context.Context, productID string, fansCount uint64) error {
	err := use.ProductStatisticsRepo.IncFansCount(ctx, productID, fansCount)
	if err != nil {
		return errs.DBErrorL(logx.WithContext(ctx),
			[]logx.LogField{
				{Key: "product_id", Value: productID},
				{Key: "func", Value: "ProductStatisticsRepo.IncFansCount"},
				{Key: "err", Value: err.Error()},
			}, "failed to inc fans count")
	}

	return nil
}

func (use *ProductUseCase) DecFansCount(ctx context.Context, productID string, fansCount uint64) error {
	err := use.ProductStatisticsRepo.DecFansCount(ctx, productID, fansCount)
	if err != nil {
		return errs.DBErrorL(logx.WithContext(ctx),
			[]logx.LogField{
				{Key: "product_id", Value: productID},
				{Key: "func", Value: "ProductStatisticsRepo.DecFansCount"},
				{Key: "err", Value: err.Error()},
			}, "failed to dec fans count")
	}

	return nil
}

func (use *ProductUseCase) BindTag(ctx context.Context, binding usecase.TagsBindingTable) error {
	_, err := use.TagRepo.GetByID(ctx, binding.TagID)
	if err != nil {
		if errors.Is(err, repo.ErrNotFound) {
			return errs.ResourceNotFound("failed to get tags")
		}

		return err
	}

	_, err = use.ProductRepo.FindOneByID(ctx, binding.ReferenceID)
	if err != nil {
		if errors.Is(err, repo.ErrNotFound) {
			return errs.ResourceNotFound("failed to get tags")
		}

		return err
	}

	err = use.TagBinding.BindTags(ctx, []*entity.TagsBindingTable{{ReferenceID: binding.ReferenceID, TagID: binding.TagID}})
	if err != nil {
		return errs.DBErrorL(logx.WithContext(ctx),
			[]logx.LogField{
				{Key: "binding", Value: binding},
				{Key: "func", Value: "TagBinding.BindTags"},
				{Key: "err", Value: err.Error()},
			}, "failed to bind tags")
	}

	return nil
}

func (use *ProductUseCase) UnbindTag(ctx context.Context, binding usecase.TagsBindingTable) error {
	_, err := use.TagRepo.GetByID(ctx, binding.TagID)
	if err != nil {
		if errors.Is(err, repo.ErrNotFound) {
			return errs.ResourceNotFound("failed to get tags")
		}

		return err
	}

	_, err = use.ProductRepo.FindOneByID(ctx, binding.ReferenceID)
	if err != nil {
		if errors.Is(err, repo.ErrNotFound) {
			return errs.ResourceNotFound("failed to get tags")
		}

		return err
	}

	err = use.TagBinding.UnbindTag(ctx, binding.TagID, binding.ReferenceID)
	if err != nil {
		return errs.DBErrorL(logx.WithContext(ctx),
			[]logx.LogField{
				{Key: "binding", Value: binding},
				{Key: "func", Value: "TagBinding.UnbindTag"},
				{Key: "err", Value: err.Error()},
			}, "failed to unbind tags")
	}

	return nil
}

func (use *ProductUseCase) GetBindingsByReference(ctx context.Context, referenceID string) ([]usecase.TagsBindingTableResp, error) {
	ref, err := use.TagBinding.GetBindingsByReference(ctx, referenceID)
	if err != nil {
		return nil, errs.DBErrorL(logx.WithContext(ctx),
			[]logx.LogField{
				{Key: "referenceID", Value: referenceID},
				{Key: "func", Value: "TagBinding.GetBindingsByReference"},
				{Key: "err", Value: err.Error()},
			}, "failed to get bindings by reference")
	}

	result := make([]usecase.TagsBindingTableResp, 0, len(ref))
	for _, bind := range ref {
		result = append(result, usecase.TagsBindingTableResp{
			ID:          bind.ID.Hex(),
			ReferenceID: bind.ReferenceID,
			TagID:       bind.TagID,
			CreatedAt:   utils.UnixToRfc3339(bind.CreatedAt),
			UpdatedAt:   utils.UnixToRfc3339(bind.UpdatedAt),
		})
	}

	return result, nil
}

func (use *ProductUseCase) ListTagBinding(ctx context.Context, params usecase.TagBindingQueryParams) ([]usecase.TagsBindingTableResp, int64, error) {
	ref, total, err := use.TagBinding.ListTagBinding(ctx, repository.TagBindingQueryParams{
		ReferenceID: params.ReferenceID,
		TagID:       params.TagID,
		PageIndex:   params.PageIndex,
		PageSize:    params.PageSize,
	})
	if err != nil {
		return nil, 0, errs.DBErrorL(logx.WithContext(ctx),
			[]logx.LogField{
				{Key: "params", Value: params},
				{Key: "func", Value: "TagBinding.ListTagBinding"},
				{Key: "err", Value: err.Error()},
			}, "failed to list tags")
	}

	result := make([]usecase.TagsBindingTableResp, 0, len(ref))
	for _, bind := range ref {
		result = append(result, usecase.TagsBindingTableResp{
			ID:          bind.ID.Hex(),
			ReferenceID: bind.ReferenceID,
			TagID:       bind.TagID,
			CreatedAt:   utils.UnixToRfc3339(bind.CreatedAt),
			UpdatedAt:   utils.UnixToRfc3339(bind.UpdatedAt),
		})
	}

	return result, total, nil
}

func logDBError(ctx context.Context, funcName string, fields []logx.LogField, err error, msg string) error {
	return errs.DBErrorL(logx.WithContext(ctx), append(fields, logx.Field("func", funcName), logx.Field("err", err.Error())), msg)
}

func buildTagsBinding(referenceID string, tags []string) []*entity.TagsBindingTable {
	binding := make([]*entity.TagsBindingTable, 0, len(tags))
	for _, tag := range tags {
		binding = append(binding, &entity.TagsBindingTable{
			ReferenceID: referenceID,
			TagID:       tag,
		})
	}

	return binding
}

func convertUseCaseToEntity(product *usecase.Product) *entity.Product {
	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
	}

	return insert
}

func convertUseCaseToUpdateParams(product *usecase.Product) *repository.ProductUpdateParams {
	update := &repository.ProductUpdateParams{}
	if product.Title != nil {
		update.Title = product.Title
	}
	if product.IsPublished != nil {
		update.IsPublished = product.IsPublished
	}
	if product.Category != nil {
		update.Category = product.Category
	}
	if product.ShortTitle != nil {
		update.ShortTitle = product.ShortTitle
	}
	if product.Details != nil {
		update.Details = product.Details
	}
	if product.ShortDescription != nil {
		update.ShortDescription = *product.ShortDescription
	}
	if product.Slug != nil {
		update.Slug = product.Slug
	}
	if product.Amount != 0 {
		update.Amount = &product.Amount
	}
	if product.StartTime != nil {
		st := utils.Rfc3339ToUnix(utils.ToValue(product.StartTime))
		update.StartTime = &st
	}
	if product.EndTime != nil {
		et := utils.Rfc3339ToUnix(utils.ToValue(product.EndTime))
		update.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})
		}
		update.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})
		}
		update.CustomFields = cf
	}

	return update
}

func convertEntityToResp(p *entity.Product, stats *entity.ProductStatistics, tags []*entity.Tags) *usecase.ProductResp {
	tagsResp := make([]usecase.Tags, 0, len(tags))
	for _, tag := range tags {
		item := usecase.Tags{
			ID:        tag.ID.Hex(),
			Types:     tag.Types,
			Name:      tag.Name,
			ShowType:  tag.ShowType,
			UpdatedAt: utils.UnixToRfc3339(tag.UpdatedAt),
			CreatedAt: utils.UnixToRfc3339(tag.CreatedAt),
		}
		if tag.Cover != nil {
			item.Cover = *tag.Cover
		}
		tagsResp = append(tagsResp, item)
	}

	media := make([]usecase.Media, 0, len(p.Media))
	for _, m := range p.Media {
		media = append(media, usecase.Media{Sort: m.Sort, URL: m.URL, Type: m.Type})
	}

	cf := make([]usecase.CustomFields, 0, len(p.CustomFields))
	for _, field := range p.CustomFields {
		cf = append(cf, usecase.CustomFields{Key: field.Key, Value: field.Value})
	}

	return &usecase.ProductResp{
		ID:                      p.ID.Hex(),
		UID:                     p.UID,
		Title:                   p.Title,
		ShortTitle:              utils.ToValue(p.ShortTitle),
		Details:                 utils.ToValue(p.Details),
		ShortDescription:        p.ShortDescription,
		Slug:                    utils.ToValue(p.Slug),
		IsPublished:             p.IsPublished,
		Amount:                  p.Amount,
		StartTime:               utils.UnixToRfc3339(utils.ToValue(p.StartTime)),
		EndTime:                 utils.UnixToRfc3339(utils.ToValue(p.EndTime)),
		Category:                p.Category,
		Media:                   media,
		CustomFields:            cf,
		Tags:                    tagsResp,
		Orders:                  stats.Orders,
		OrdersUpdateTime:        utils.UnixToRfc3339(stats.OrdersUpdateTime),
		AverageRating:           stats.AverageRating,
		AverageRatingUpdateTime: utils.UnixToRfc3339(stats.AverageRatingUpdateTime),
		FansCount:               stats.FansCount,
		FansCountUpdateTime:     utils.UnixToRfc3339(stats.FansCountUpdateTime),
		UpdatedAt:               utils.UnixToRfc3339(p.UpdatedAt),
		CreatedAt:               utils.UnixToRfc3339(p.CreatedAt),
	}
}