package model

import "time"

// ---- 状态枚举 ----

type OrderStatusV2 string

// 注:v1 model.OrderStatus 已占用 OrderPending/OrderPaid/OrderRefunded 三个标识符,
// 为免包内重名冲突,v2 状态枚举统一加 V2 后缀(与 AttemptStatus/RefundStatus 的独立命名空间不冲突,故那两组不加后缀)。
const (
	OrderCreatedV2      OrderStatusV2 = "created"
	OrderPendingV2      OrderStatusV2 = "pending"
	OrderPaidV2         OrderStatusV2 = "paid"
	OrderCanceledV2     OrderStatusV2 = "canceled"
	OrderExpiredV2      OrderStatusV2 = "expired"
	OrderRefundingV2    OrderStatusV2 = "refunding"
	OrderPartRefundedV2 OrderStatusV2 = "partially_refunded"
	OrderRefundedV2     OrderStatusV2 = "refunded"
)

type AttemptStatus string

const (
	AttemptCreated AttemptStatus = "created"
	AttemptPending AttemptStatus = "pending"
	AttemptPaid    AttemptStatus = "paid"
	AttemptFailed  AttemptStatus = "failed"
	AttemptExpired AttemptStatus = "expired"
)

type RefundStatus string

const (
	RefundRequested     RefundStatus = "requested"
	RefundProcessing    RefundStatus = "processing"
	RefundSucceeded     RefundStatus = "succeeded"
	RefundFailed        RefundStatus = "failed"
	RefundManualPending RefundStatus = "manual_pending" // crypto 自托管:待运营人工 sweep 退款
)

// Settled 报告订单是否「已真正收到过钱」(paid 及其后的退款态)。webhook 投递门禁用:
// 只有已结算订单的 outbox 才放行——payment 事件挡住崩溃窗口里的未付单,refund 事件
// 则因订单已 paid 过而正常放行(不会因订单转入退款态被卡)。
func (s OrderStatusV2) Settled() bool {
	switch s {
	case OrderPaidV2, OrderRefundingV2, OrderPartRefundedV2, OrderRefundedV2:
		return true
	}
	return false
}

// ---- 业务订单(购买账本)----

type OrderV2 struct {
	Base
	OutTradeNo string `gorm:"uniqueIndex;size:64;not null"`
	MerchantID uint64 `gorm:"index"`
	BizSystem  string `gorm:"index;size:32"` // 接入方(pangolin/jiu),空=独立收款
	BizRef     string `gorm:"size:128"`      // 接入方业务单号,回调原样带回
	ProductID  uint64 `gorm:"index"`
	BizCode    string `gorm:"index;size:64"` // 套餐码副本(下单时从 product 复制),回调带回业务方按码映射权益(设计 §5)
	Subject    string `gorm:"size:128"`
	// 金额:int64 最小单位 + 币种(presentment/charge/settlement 三态在 charge 落地此处)
	AmountMinor int64         `gorm:"not null"`
	Currency    string        `gorm:"size:16;not null"`
	Status      OrderStatusV2 `gorm:"index;size:24;not null"`
	// 折扣(业务授权的折后价,记账留痕)
	BaseAmountMinor int64  `gorm:"default:0"`
	DiscountMinor   int64  `gorm:"default:0"`
	CampaignID      string `gorm:"size:64"`
	DiscountReason  string `gorm:"size:128"`
	PaidAt          *time.Time
	ExpiresAt       *time.Time // 整体购买窗口
}

// ---- 支付尝试(收款账本)----

type Attempt struct {
	Base
	OutTradeNo  string        `gorm:"index;size:64;not null"`
	Channel     string        `gorm:"index;size:32;not null;uniqueIndex:uq_attempt_provider"` // alipay/wechat/crypto/stripe/...
	AccountID   string        `gorm:"index;size:64"`                                          // 选中的收款账户
	Provider    string        `gorm:"size:32"`
	ProviderRef string        `gorm:"size:128;uniqueIndex:uq_attempt_provider"` // 渠道单号
	RenderType  string        `gorm:"size:24"`                                  // redirect/qr/crypto_address/...
	AmountMinor int64         `gorm:"not null"`
	Currency    string        `gorm:"size:16;not null"`
	Status      AttemptStatus `gorm:"index;size:16;not null"`
	ExpiresAt   *time.Time    // 本次尝试超时
	PaidAt      *time.Time
}

// ---- 收款账户(同一渠道多账户)----

type Account struct {
	Base
	AccountID  string `gorm:"uniqueIndex;size:64;not null"` // 逻辑账户标识(配置里声明)
	Channel    string `gorm:"index;size:32;not null"`
	Weight     int    `gorm:"default:1"`
	Enabled    bool   `gorm:"default:true"`
	DailyLimit int64  `gorm:"default:0"` // 0=不限
	Region     string `gorm:"size:16"`   // cn/global/...
	Subject    string `gorm:"size:128"`  // 收款主体
	// 凭证不落库明文:仅存 env 变量名引用,真值运行时从 env 取(见 Task 4)
	CredentialEnvPrefix string `gorm:"size:64"`
}

// ---- 退款子实体 ----

type Refund struct {
	Base
	RefundID           string       `gorm:"uniqueIndex;size:64;not null"`
	OutTradeNo         string       `gorm:"index;size:64;not null"`
	AttemptProviderRef string       `gorm:"size:128"` // 针对哪笔支付,原路退
	AmountMinor        int64        `gorm:"not null"`
	Currency           string       `gorm:"size:16;not null"`
	Reason             string       `gorm:"size:256"`
	Status             RefundStatus `gorm:"index;size:16;not null"`
	ProviderRefundRef  string       `gorm:"size:128"`
	InitiatedBy        string       `gorm:"size:16"` // business/platform
	CompletedAt        *time.Time
}