package entities

import (
	"errors"
	"time"

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

// RechargeType 充值类型枚举
type RechargeType string

const (
	RechargeTypeAlipay   RechargeType = "alipay"   // 支付宝充值
	RechargeTypeTransfer RechargeType = "transfer" // 对公转账
	RechargeTypeGift     RechargeType = "gift"     // 赠送
)

// RechargeStatus 充值状态枚举
type RechargeStatus string

const (
	RechargeStatusPending   RechargeStatus = "pending"   // 待处理
	RechargeStatusSuccess   RechargeStatus = "success"   // 成功
	RechargeStatusFailed    RechargeStatus = "failed"    // 失败
	RechargeStatusCancelled RechargeStatus = "cancelled" // 已取消
)

// RechargeRecord 充值记录实体
// 记录用户的各种充值操作，包括支付宝充值、对公转账、赠送等
type RechargeRecord struct {
	// 基础标识
	ID     string `gorm:"primaryKey;type:varchar(36)" json:"id" comment:"充值记录唯一标识"`
	UserID string `gorm:"type:varchar(36);not null;index" json:"user_id" comment:"充值用户ID"`

	// 充值信息
	Amount       decimal.Decimal `gorm:"type:decimal(20,8);not null" json:"amount" comment:"充值金额"`
	RechargeType RechargeType    `gorm:"type:varchar(20);not null;index" json:"recharge_type" comment:"充值类型"`
	Status       RechargeStatus  `gorm:"type:varchar(20);not null;default:'pending';index" json:"status" comment:"充值状态"`

	// 订单号字段（根据充值类型使用不同字段）
	AlipayOrderID   *string `gorm:"type:varchar(64);uniqueIndex" json:"alipay_order_id,omitempty" comment:"支付宝订单号"`
	TransferOrderID *string `gorm:"type:varchar(64);uniqueIndex" json:"transfer_order_id,omitempty" comment:"转账订单号"`

	// 通用字段
	Notes string `gorm:"type:varchar(500)" json:"notes,omitempty" comment:"备注信息"`

	// 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 (RechargeRecord) TableName() string {
	return "recharge_records"
}

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

// IsPending 检查是否为待处理状态
func (r *RechargeRecord) IsPending() bool {
	return r.Status == RechargeStatusPending
}

// IsSuccess 检查是否为成功状态
func (r *RechargeRecord) IsSuccess() bool {
	return r.Status == RechargeStatusSuccess
}

// IsFailed 检查是否为失败状态
func (r *RechargeRecord) IsFailed() bool {
	return r.Status == RechargeStatusFailed
}

// IsCancelled 检查是否为已取消状态
func (r *RechargeRecord) IsCancelled() bool {
	return r.Status == RechargeStatusCancelled
}

// MarkSuccess 标记为成功
func (r *RechargeRecord) MarkSuccess() {
	r.Status = RechargeStatusSuccess
}

// MarkFailed 标记为失败
func (r *RechargeRecord) MarkFailed() {
	r.Status = RechargeStatusFailed
}

// MarkCancelled 标记为已取消
func (r *RechargeRecord) MarkCancelled() {
	r.Status = RechargeStatusCancelled
}

// ValidatePaymentMethod 验证支付方式：支付宝订单号和转账订单号只能有一个存在
func (r *RechargeRecord) ValidatePaymentMethod() error {
	hasAlipay := r.AlipayOrderID != nil && *r.AlipayOrderID != ""
	hasTransfer := r.TransferOrderID != nil && *r.TransferOrderID != ""

	if hasAlipay && hasTransfer {
		return errors.New("支付宝订单号和转账订单号不能同时存在")
	}

	if !hasAlipay && !hasTransfer {
		return errors.New("必须提供支付宝订单号或转账订单号")
	}

	return nil
}

// GetOrderID 获取订单号（根据充值类型返回对应的订单号）
func (r *RechargeRecord) GetOrderID() string {
	switch r.RechargeType {
	case RechargeTypeAlipay:
		if r.AlipayOrderID != nil {
			return *r.AlipayOrderID
		}
	case RechargeTypeTransfer:
		if r.TransferOrderID != nil {
			return *r.TransferOrderID
		}
	}
	return ""
}

// SetAlipayOrderID 设置支付宝订单号
func (r *RechargeRecord) SetAlipayOrderID(orderID string) {
	r.AlipayOrderID = &orderID
}

// SetTransferOrderID 设置转账订单号
func (r *RechargeRecord) SetTransferOrderID(orderID string) {
	r.TransferOrderID = &orderID
}

// NewAlipayRechargeRecord 工厂方法 - 创建支付宝充值记录
func NewAlipayRechargeRecord(userID string, amount decimal.Decimal, alipayOrderID string) *RechargeRecord {
	return &RechargeRecord{
		UserID:        userID,
		Amount:        amount,
		RechargeType:  RechargeTypeAlipay,
		Status:        RechargeStatusPending,
		AlipayOrderID: &alipayOrderID,
	}
}

// NewTransferRechargeRecord 工厂方法 - 创建对公转账充值记录
func NewTransferRechargeRecord(userID string, amount decimal.Decimal, transferOrderID, notes string) *RechargeRecord {
	return &RechargeRecord{
		UserID:          userID,
		Amount:          amount,
		RechargeType:    RechargeTypeTransfer,
		Status:          RechargeStatusPending,
		TransferOrderID: &transferOrderID,
		Notes:           notes,
	}
}

// NewGiftRechargeRecord 工厂方法 - 创建赠送充值记录
func NewGiftRechargeRecord(userID string, amount decimal.Decimal, notes string) *RechargeRecord {
	return &RechargeRecord{
		UserID:       userID,
		Amount:       amount,
		RechargeType: RechargeTypeGift,
		Status:       RechargeStatusSuccess, // 赠送直接标记为成功
		Notes:        notes,
	}
}