package purchase

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

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

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

// CreatePurchase 创建购买记录
func (s *PurchaseService) CreatePurchase(userId, contentId uint64, contentType purchase.ContentType, price float64) error {
	p := &purchase.Purchase{}
	var err error

	if contentType == purchase.ContentTypeColumn {
		p, err = s.repo.FindColumnWithId(userId, contentId)

	} else {
		p, err = s.repo.FindArticleWithId(userId, contentId)

	}

	// 检查是否已购买
	if err != nil {
		return err
	}
	if p != nil {
		return errors.New("已经购买过该内容")
	}

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