package entities

import (
	"time"

	"github.com/google/uuid"
	"github.com/shopspring/decimal"
	"gorm.io/gorm"
)

// PayOrderStatus 支付订单状态枚举（通用）
type PayOrderStatus string

const (
	PayOrderStatusPending   PayOrderStatus = "pending"   // 待支付
	PayOrderStatusSuccess   PayOrderStatus = "success"   // 支付成功
	PayOrderStatusFailed    PayOrderStatus = "failed"    // 支付失败
	PayOrderStatusCancelled PayOrderStatus = "cancelled" // 已取消
	PayOrderStatusClosed    PayOrderStatus = "closed"    // 已关闭
)

// PayOrder 支付订单详情实体（统一表 typay_orders，兼容多支付渠道）
type PayOrder struct {
	// 基础标识
	ID         string  `gorm:"primaryKey;type:varchar(36)" json:"id" comment:"支付订单唯一标识"`
	RechargeID string  `gorm:"type:varchar(36);not null;uniqueIndex" json:"recharge_id" comment:"关联充值记录ID"`
	OutTradeNo string  `gorm:"type:varchar(64);not null;uniqueIndex" json:"out_trade_no" comment:"商户订单号"`
	TradeNo    *string `gorm:"type:varchar(64);uniqueIndex" json:"trade_no,omitempty" comment:"第三方支付交易号"`

	// 订单信息
	Subject    string          `gorm:"type:varchar(200);not null" json:"subject" comment:"订单标题"`
	Amount     decimal.Decimal `gorm:"type:decimal(20,8);not null" json:"amount" comment:"订单金额"`
	Platform   string          `gorm:"type:varchar(20);not null" json:"platform" comment:"支付平台：app/h5/pc/wx_h5/wx_mini等"`
	PayChannel string          `gorm:"type:varchar(20);not null;default:'alipay';index" json:"pay_channel" comment:"支付渠道：alipay/wechat"`
	Status     PayOrderStatus  `gorm:"type:varchar(20);not null;default:'pending';index" json:"status" comment:"订单状态"`

	// 支付渠道返回信息
	BuyerID       string          `gorm:"type:varchar(64)" json:"buyer_id,omitempty" comment:"买家ID（支付渠道方）"`
	SellerID      string          `gorm:"type:varchar(64)" json:"seller_id,omitempty" comment:"卖家ID（支付渠道方）"`
	PayAmount     decimal.Decimal `gorm:"type:decimal(20,8)" json:"pay_amount,omitempty" comment:"实际支付金额"`
	ReceiptAmount decimal.Decimal `gorm:"type:decimal(20,8)" json:"receipt_amount,omitempty" comment:"实收金额"`

	// 回调信息
	NotifyTime *time.Time `gorm:"index" json:"notify_time,omitempty" comment:"异步通知时间"`
	ReturnTime *time.Time `gorm:"index" json:"return_time,omitempty" comment:"同步返回时间"`

	// 错误信息
	ErrorCode    string `gorm:"type:varchar(64)" json:"error_code,omitempty" comment:"错误码"`
	ErrorMessage string `gorm:"type:text" json:"error_message,omitempty" comment:"错误信息"`

	// 时间戳字段
	CreatedAt time.Time      `gorm:"autoCreateTime" json:"created_at" comment:"创建时间"`
	UpdatedAt time.Time      `gorm:"autoUpdateTime" json:"updated_at" comment:"更新时间"`
	DeletedAt gorm.DeletedAt `gorm:"index" json:"-" comment:"软删除时间"`
}

// TableName 指定数据库表名
func (PayOrder) TableName() string {
	return "typay_orders"
}

// BeforeCreate GORM钩子：创建前自动生成UUID
func (p *PayOrder) BeforeCreate(tx *gorm.DB) error {
	if p.ID == "" {
		p.ID = uuid.New().String()
	}
	return nil
}

// IsPending 检查是否为待支付状态
func (p *PayOrder) IsPending() bool {
	return p.Status == PayOrderStatusPending
}

// IsSuccess 检查是否为支付成功状态
func (p *PayOrder) IsSuccess() bool {
	return p.Status == PayOrderStatusSuccess
}

// IsFailed 检查是否为支付失败状态
func (p *PayOrder) IsFailed() bool {
	return p.Status == PayOrderStatusFailed
}

// IsCancelled 检查是否为已取消状态
func (p *PayOrder) IsCancelled() bool {
	return p.Status == PayOrderStatusCancelled
}

// IsClosed 检查是否为已关闭状态
func (p *PayOrder) IsClosed() bool {
	return p.Status == PayOrderStatusClosed
}

// MarkSuccess 标记为支付成功
func (p *PayOrder) MarkSuccess(tradeNo, buyerID, sellerID string, payAmount, receiptAmount decimal.Decimal) {
	p.Status = PayOrderStatusSuccess
	p.TradeNo = &tradeNo
	p.BuyerID = buyerID
	p.SellerID = sellerID
	p.PayAmount = payAmount
	p.ReceiptAmount = receiptAmount
	now := time.Now()
	p.NotifyTime = &now
}

// MarkFailed 标记为支付失败
func (p *PayOrder) MarkFailed(errorCode, errorMessage string) {
	p.Status = PayOrderStatusFailed
	p.ErrorCode = errorCode
	p.ErrorMessage = errorMessage
}

// MarkCancelled 标记为已取消
func (p *PayOrder) MarkCancelled() {
	p.Status = PayOrderStatusCancelled
}

// MarkClosed 标记为已关闭
func (p *PayOrder) MarkClosed() {
	p.Status = PayOrderStatusClosed
}

// NewPayOrder 通用工厂方法 - 创建支付订单（支持多支付渠道）
func NewPayOrder(rechargeID, outTradeNo, subject string, amount decimal.Decimal, platform, payChannel string) *PayOrder {
	return &PayOrder{
		ID:         uuid.New().String(),
		RechargeID: rechargeID,
		OutTradeNo: outTradeNo,
		Subject:    subject,
		Amount:     amount,
		Platform:   platform,
		PayChannel: payChannel,
		Status:     PayOrderStatusPending,
	}
}