cls/internal/application/purchase/service.go

package purchase

import (
	"cls/internal/domain/purchase"
	"errors"
)

// Service 购买记录应用服务
type Service struct {
	repo purchase.Repository
}

// NewService 创建购买记录应用服务
func NewService(repo purchase.Repository) *Service {
	return &Service{
		repo: repo,
	}
}

// HasPermission 检查用户是否有权限访问内容
func (s *Service) HasPermission(userId, contentId uint64, contentType purchase.ContentType, price float64) (bool, error) {
	// 如果内容是免费的，直接返回true
	if price == 0 {
		return true, nil
	}

	// 检查用户是否购买了内容
	purchase, err := s.repo.FindByUserIdAndContent(userId, contentId, contentType)
	if err != nil {
		return false, err
	}
	if purchase == nil {
		return false, nil
	}

	return purchase.IsValid(), nil
}

// CreatePurchase 创建购买记录
func (s *Service) CreatePurchase(userId, contentId uint64, contentType purchase.ContentType, price float64) error {
	// 检查是否已购买
	exist, err := s.repo.FindByUserIdAndContent(userId, contentId, contentType)
	if err != nil {
		return err
	}
	if exist != nil {
		return errors.New("已经购买过该内容")
	}

	// 创建购买记录
	purchase := purchase.NewPurchase(userId, contentId, contentType, price, 0)
	return s.repo.Save(purchase)
}