package model

import (
	"database/sql/driver"
	"encoding/json"
	"time"

	"gorm.io/gorm"
)

// Wallet 钱包模型
// 个人客户和代理商的资金账户，支持充值、消费、提现等操作
// 使用乐观锁（version字段）防止并发余额冲突
// 钱包归属资源（卡/设备/店铺），支持资源转手场景
type Wallet struct {
	gorm.Model
	BaseModel     `gorm:"embedded"`
	ResourceType  string `gorm:"column:resource_type;type:varchar(20);not null;uniqueIndex:idx_wallet_resource_type_currency,priority:1;index:idx_wallet_resource,priority:1;comment:资源类型 iot_card-物联网卡 device-设备 shop-店铺" json:"resource_type"`
	ResourceID    uint   `gorm:"column:resource_id;not null;uniqueIndex:idx_wallet_resource_type_currency,priority:2;index:idx_wallet_resource,priority:2;comment:资源ID" json:"resource_id"`
	WalletType    string `gorm:"column:wallet_type;type:varchar(20);not null;uniqueIndex:idx_wallet_resource_type_currency,priority:3;comment:钱包类型 main-主钱包 commission-分佣钱包" json:"wallet_type"`
	Balance       int64  `gorm:"column:balance;type:bigint;not null;default:0;comment:余额（分）" json:"balance"`
	FrozenBalance int64  `gorm:"column:frozen_balance;type:bigint;not null;default:0;comment:冻结余额（分）" json:"frozen_balance"`
	Currency      string `gorm:"column:currency;type:varchar(10);not null;default:'CNY';uniqueIndex:idx_wallet_resource_type_currency,priority:4;comment:币种" json:"currency"`
	Status        int    `gorm:"column:status;type:int;not null;default:1;index:idx_wallet_status;comment:钱包状态 1-正常 2-冻结 3-关闭" json:"status"`
	Version       int    `gorm:"column:version;type:int;not null;default:0;comment:版本号（乐观锁）" json:"version"`
}

// TableName 指定表名
func (Wallet) TableName() string {
	return "tb_wallet"
}

// WalletMetadata 钱包交易扩展信息
// 用于存储交易相关的额外数据（JSONB格式）
type WalletMetadata map[string]interface{}

// Value 实现 driver.Valuer 接口
func (m WalletMetadata) Value() (driver.Value, error) {
	return json.Marshal(m)
}

// Scan 实现 sql.Scanner 接口
func (m *WalletMetadata) Scan(value interface{}) error {
	if value == nil {
		*m = make(WalletMetadata)
		return nil
	}
	bytes, ok := value.([]byte)
	if !ok {
		return nil
	}
	return json.Unmarshal(bytes, m)
}

// WalletTransaction 钱包交易记录模型
// 记录所有钱包余额变动，包含变动前后余额用于对账
// 支持关联业务对象（订单、分佣、提现等）
type WalletTransaction struct {
	gorm.Model
	WalletID        uint           `gorm:"column:wallet_id;not null;index:idx_wallet_tx_wallet;comment:钱包ID" json:"wallet_id"`
	UserID          uint           `gorm:"column:user_id;not null;index:idx_wallet_tx_user;comment:用户ID" json:"user_id"`
	TransactionType string         `gorm:"column:transaction_type;type:varchar(20);not null;comment:交易类型 recharge-充值 deduct-扣款 refund-退款 commission-分佣 withdrawal-提现" json:"transaction_type"`
	Amount          int64          `gorm:"column:amount;type:bigint;not null;comment:变动金额（分）正数为增加 负数为减少" json:"amount"`
	BalanceBefore   int64          `gorm:"column:balance_before;type:bigint;not null;comment:变动前余额（分）" json:"balance_before"`
	BalanceAfter    int64          `gorm:"column:balance_after;type:bigint;not null;comment:变动后余额（分）" json:"balance_after"`
	Status          int            `gorm:"column:status;type:int;not null;default:1;comment:交易状态 1-成功 2-失败 3-处理中" json:"status"`
	ReferenceType   *string        `gorm:"column:reference_type;type:varchar(50);index:idx_wallet_tx_ref,priority:1;comment:关联业务类型 order/commission/withdrawal/topup" json:"reference_type,omitempty"`
	ReferenceID     *uint          `gorm:"column:reference_id;type:bigint;index:idx_wallet_tx_ref,priority:2;comment:关联业务ID" json:"reference_id,omitempty"`
	Remark          *string        `gorm:"column:remark;type:text;comment:备注" json:"remark,omitempty"`
	Metadata        WalletMetadata `gorm:"column:metadata;type:jsonb;comment:扩展信息" json:"metadata,omitempty"`
	Creator         uint           `gorm:"column:creator;comment:创建人ID" json:"creator"`
}

// TableName 指定表名
func (WalletTransaction) TableName() string {
	return "tb_wallet_transaction"
}

// RechargeRecord 充值记录模型
// 用户和代理的钱包充值订单，记录支付流程和状态
type RechargeRecord struct {
	gorm.Model
	BaseModel            `gorm:"embedded"`
	UserID               uint       `gorm:"column:user_id;not null;index:idx_recharge_user;comment:用户ID" json:"user_id"`
	WalletID             uint       `gorm:"column:wallet_id;not null;comment:钱包ID" json:"wallet_id"`
	RechargeNo           string     `gorm:"column:recharge_no;type:varchar(50);not null;uniqueIndex:idx_recharge_no;comment:充值订单号" json:"recharge_no"`
	Amount               int64      `gorm:"column:amount;type:bigint;not null;comment:充值金额（分）" json:"amount"`
	PaymentMethod        string     `gorm:"column:payment_method;type:varchar(20);not null;comment:支付方式 alipay-支付宝 wechat-微信 bank-银行转账 offline-线下" json:"payment_method"`
	PaymentChannel       *string    `gorm:"column:payment_channel;type:varchar(50);comment:支付渠道" json:"payment_channel,omitempty"`
	PaymentTransactionID *string    `gorm:"column:payment_transaction_id;type:varchar(100);comment:第三方支付交易号" json:"payment_transaction_id,omitempty"`
	Status               int        `gorm:"column:status;type:int;not null;default:1;index:idx_recharge_status;comment:充值状态 1-待支付 2-已支付 3-已完成 4-已关闭 5-已退款" json:"status"`
	PaidAt               *time.Time `gorm:"column:paid_at;comment:支付时间" json:"paid_at,omitempty"`
	CompletedAt          *time.Time `gorm:"column:completed_at;comment:完成时间" json:"completed_at,omitempty"`
}

// TableName 指定表名
func (RechargeRecord) TableName() string {
	return "tb_recharge_record"
}
