package payment

import (
	"cls/internal/domain/payment"
	"cls/pkg/logger"
	"cls/pkg/util/page"
	"cls/pkg/web"
	"errors"
	"fmt"
	"time"
)

var (
	ErrInvalidAmount = errors.New("价格不能小于0")
	ErrInvalidType   = errors.New("无效的支付类型")
	ErrOrderExists   = errors.New("订单已存在")
	ErrOrderNotFound = errors.New("订单不存在")
	ErrOrderExpired  = errors.New("订单已过期")
	ErrOrderPaid     = errors.New("订单已支付")
	ErrOrderCanceled = errors.New("订单已取消")
)

// PaymentService 支付服务
type PaymentService struct {
	repo payment.PaymentRepository
	log  logger.Logger
}

// NewService 创建支付服务
func NewService(repo payment.PaymentRepository, log logger.New) *PaymentService {
	return &PaymentService{
		repo: repo,
		log:  log("cls:service:payment"),
	}
}

// CreateOrder 创建支付订单
func (s *PaymentService) CreateOrder(userID, targetID uint64, paymentType payment.PaymentType, amount int64, description string) (*payment.Payment, error) {
	if amount <= 0 {
		return nil, ErrInvalidAmount
	}

	// 生成订单号
	orderNo := fmt.Sprintf("%d%d%d", time.Now().UnixNano(), userID, targetID)

	// 检查订单是否已存在
	_, err := s.repo.GetByOrderNo(orderNo)
	if err == nil {
		return nil, ErrOrderExists
	}

	// 创建支付订单
	payment := &payment.Payment{
		OrderNo:     orderNo,
		UserID:      userID,
		TargetID:    targetID,
		Type:        paymentType,
		Amount:      amount,
		Status:      payment.PaymentStatusPending,
		Description: description,
	}

	// 保存订单
	if err := s.repo.Create(payment); err != nil {
		return nil, err
	}

	return payment, nil
}

// GetOrder 获取支付订单
func (s *PaymentService) GetOrder(orderNo string) (*payment.Payment, error) {
	return s.repo.GetByOrderNo(orderNo)
}

// GetUserOrders 获取用户支付订单列表
func (s *PaymentService) GetUserOrders(userID uint64, page *page.Page, params map[string]string) error {
	conds := web.ParseFilters(params)
	return s.repo.ListByUserID(userID, page, conds)
}

// GetOrderList 获取支付订单列表
func (s *PaymentService) GetOrderList(page *page.Page, params map[string]string) error {
	conds := web.ParseFilters(params)
	return s.repo.FindAll(page, conds)
}

// UpdateOrderStatus 更新订单状态
func (s *PaymentService) UpdateOrderStatus(orderNo string, status payment.PaymentStatus, transactionID string, notifyData string) error {
	order, err := s.repo.GetByOrderNo(orderNo)
	if err != nil {
		return ErrOrderNotFound
	}

	// 检查订单状态
	if order.Status != payment.PaymentStatusPending {
		return ErrOrderPaid
	}

	// 更新订单状态
	order.Status = status
	order.TransactionID = transactionID
	order.NotifyData = notifyData

	return s.repo.Update(order)
}

// CancelOrder 取消支付订单
func (s *PaymentService) CancelOrder(orderNo string) error {
	order, err := s.repo.GetByOrderNo(orderNo)
	if err != nil {
		return ErrOrderNotFound
	}

	// 检查订单状态
	if order.Status != payment.PaymentStatusFailed {
		return ErrOrderPaid
	}

	// 更新订单状态为已取消
	order.Status = payment.PaymentStatusRefunded
	return s.repo.Update(order)
}

// DeleteOrder 删除支付订单
func (s *PaymentService) DeleteOrder(id uint64) error {
	return s.repo.Delete(id)
}

// CreatePayment 创建支付订单