package model

import (
	"time"

	"gorm.io/gorm"
)

const (
	MerchantStatusActive   = "active"
	MerchantStatusDisabled = "disabled"

	// MerchantCodeSelfOperated 是平台自营商户编码，作为默认商品目录的模板来源。
	MerchantCodeSelfOperated = "self-operated"

	MerchantFeatureProducts  = "products"
	MerchantFeatureOrders    = "orders"
	MerchantFeatureWallet    = "wallet"
	MerchantFeatureAPI       = "api"
	MerchantFeatureCallbacks = "callbacks"
	DefaultMerchantFeatures  = "products,orders,wallet,api,callbacks"

	MemberRoleOwner    = "owner"
	MemberRoleOperator = "operator"
	MemberRoleFinance  = "finance"
	MemberRoleViewer   = "viewer"

	PermissionMembersManage   = "members:manage"
	PermissionProductsManage  = "products:manage"
	PermissionOrdersManage    = "orders:manage"
	PermissionWalletView      = "wallet:view"
	PermissionWalletLedger    = "wallet:ledger"
	PermissionRechargeManage  = "recharge:manage"
	PermissionAPIManage       = "api:manage"
	PermissionCallbacksManage = "callbacks:manage"

	FeeTypeRate  = "rate"  // 手续费按百分比
	FeeTypeFixed = "fixed" // 手续费按固定金额

	APIClientStatusActive   = "active"
	APIClientStatusDisabled = "disabled"

	ProductStatusActive   = "active"
	ProductStatusInactive = "inactive"

	OrderStatusPaid       = "paid"        // 已扣款，待发货
	OrderStatusDelivering = "delivering"  // 发货中
	OrderStatusDelivered  = "delivered"   // 已交付
	OrderStatusShipFailed = "ship_failed" // 发货失败（可重试）
	OrderStatusCancelled  = "cancelled"   // 已取消并退款

	OrderSourceAPI    = "api"    // 商户开放接口创建
	OrderSourceManual = "manual" // 商户后台人工创建
	OrderSourceTest   = "test"   // 后台联调测试订单

	WalletLedgerCredit = "credit"
	WalletLedgerDebit  = "debit"
	WalletLedgerRefund = "refund"
	WalletLedgerAdjust = "adjust"

	CallbackStatusActive   = "active"
	CallbackStatusDisabled = "disabled"

	CallbackDeliveryPending   = "pending"
	CallbackDeliverySending   = "sending"
	CallbackDeliveryDelivered = "delivered"
	CallbackDeliveryFailed    = "failed"
)

// Merchant 商户租户，是所有新业务数据的隔离边界。
type Merchant struct {
	ID        uint           `gorm:"primarykey" json:"id"`
	CreatedAt time.Time      `json:"created_at"`
	UpdatedAt time.Time      `json:"updated_at"`
	DeletedAt gorm.DeletedAt `gorm:"index" json:"-"`

	Code        string `gorm:"uniqueIndex;size:64;not null" json:"code"`
	Name        string `gorm:"size:128;not null" json:"name"`
	Status      string `gorm:"size:16;not null;default:active;index" json:"status"`
	ContactName string `gorm:"size:64" json:"contact_name"`
	ContactInfo string `gorm:"size:128" json:"contact_info"`
	Features    string `gorm:"type:text;not null;default:'products,orders,wallet,api,callbacks'" json:"features"`

	// 手续费按"百分比或固定"二选一：fee_type=rate 用 fee_rate_bp，fee_type=fixed 用 fee_fixed_amount。
	FeeType        string `gorm:"size:16;not null;default:rate" json:"fee_type"`
	FeeRateBP      int64  `gorm:"not null;default:0" json:"fee_rate_bp"`
	FeeFixedAmount int64  `gorm:"not null;default:0" json:"fee_fixed_amount"`
}

func (m *Merchant) BeforeCreate(tx *gorm.DB) error {
	if m.Features == "" {
		m.Features = DefaultMerchantFeatures
	}
	if m.FeeType == "" {
		m.FeeType = FeeTypeRate
	}
	return nil
}

// MerchantMember 将系统账号和商户权限分离，账号可以属于多个商户。
type MerchantMember struct {
	ID        uint      `gorm:"primarykey" json:"id"`
	CreatedAt time.Time `json:"created_at"`
	UpdatedAt time.Time `json:"updated_at"`

	MerchantID uint   `gorm:"not null;uniqueIndex:idx_merchant_member;index" json:"merchant_id"`
	UserID     uint   `gorm:"not null;uniqueIndex:idx_merchant_member;index" json:"user_id"`
	Role       string `gorm:"size:32;not null;default:operator" json:"role"`
	Status     int    `gorm:"not null;default:1" json:"status"`
	IsDefault  bool   `gorm:"not null;default:false" json:"is_default"`

	Merchant *Merchant `gorm:"foreignKey:MerchantID" json:"merchant,omitempty"`
	User     *User     `gorm:"foreignKey:UserID" json:"user,omitempty"`
}

// MerchantRole 是商户内可配置的员工角色；负责人仍是系统保留角色。
type MerchantRole struct {
	ID          uint      `gorm:"primarykey" json:"id"`
	CreatedAt   time.Time `json:"created_at"`
	UpdatedAt   time.Time `json:"updated_at"`
	MerchantID  uint      `gorm:"not null;uniqueIndex:idx_merchant_role_code;index" json:"merchant_id"`
	Code        string    `gorm:"size:64;not null;uniqueIndex:idx_merchant_role_code" json:"code"`
	Name        string    `gorm:"size:64;not null" json:"name"`
	Permissions string    `gorm:"type:text;not null;default:''" json:"permissions"`
	Status      int       `gorm:"not null;default:1" json:"status"`
}

// APIClient 为一个商户的外部系统集成凭证。SecretCiphertext 仅保存加密后的密钥。
type APIClient struct {
	ID        uint           `gorm:"primarykey" json:"id"`
	CreatedAt time.Time      `json:"created_at"`
	UpdatedAt time.Time      `json:"updated_at"`
	DeletedAt gorm.DeletedAt `gorm:"index" json:"-"`

	MerchantID       uint       `gorm:"not null;index" json:"merchant_id"`
	Name             string     `gorm:"size:128;not null" json:"name"`
	AppKey           string     `gorm:"uniqueIndex;size:96;not null" json:"app_key"`
	SecretCiphertext string     `gorm:"type:text;not null" json:"-"`
	SignatureVersion string     `gorm:"size:16;not null;default:v1" json:"signature_version"`
	Scopes           string     `gorm:"type:text;not null" json:"scopes"`
	Status           string     `gorm:"size:16;not null;default:active;index" json:"status"`
	ExpiresAt        *time.Time `json:"expires_at"`
	LastUsedAt       *time.Time `json:"last_used_at"`

	Merchant *Merchant `gorm:"foreignKey:MerchantID" json:"merchant,omitempty"`
}

// Product 是平台通用商品目录；商品特性通过 Attributes 保存，避免把游戏、角色等字段写死。
type Product struct {
	ID        uint           `gorm:"primarykey" json:"id"`
	CreatedAt time.Time      `json:"created_at"`
	UpdatedAt time.Time      `json:"updated_at"`
	DeletedAt gorm.DeletedAt `gorm:"index" json:"-"`

	Code        string `gorm:"uniqueIndex;size:96;not null" json:"code"`
	Name        string `gorm:"size:160;not null" json:"name"`
	Category    string `gorm:"size:64;index" json:"category"`
	Description string `gorm:"type:text" json:"description"`
	Attributes  string `gorm:"type:text" json:"attributes"`
	Status      string `gorm:"size:16;not null;default:active;index" json:"status"`
}

// MerchantProduct 是商户可售商品及其价格、库存和发货配置。
type MerchantProduct struct {
	ID        uint           `gorm:"primarykey" json:"id"`
	CreatedAt time.Time      `json:"created_at"`
	UpdatedAt time.Time      `json:"updated_at"`
	DeletedAt gorm.DeletedAt `gorm:"index" json:"-"`

	MerchantID        uint   `gorm:"not null;uniqueIndex:idx_merchant_product_sku;index" json:"merchant_id"`
	ProductID         uint   `gorm:"not null;index" json:"product_id"`
	SKU               string `gorm:"size:96;not null;uniqueIndex:idx_merchant_product_sku" json:"sku"`
	DisplayName       string `gorm:"size:160" json:"display_name"`
	PriceAmount       int64  `gorm:"not null;default:0" json:"price_amount"`
	CostAmount        int64  `gorm:"not null;default:0" json:"cost_amount"`
	Currency          string `gorm:"size:12;not null;default:POINT" json:"currency"`
	Stock             int64  `gorm:"not null;default:-1" json:"stock"`
	Status            string `gorm:"size:16;not null;default:active;index" json:"status"`
	FulfillmentConfig string `gorm:"type:text" json:"fulfillment_config"`

	Product  *Product  `gorm:"foreignKey:ProductID" json:"product,omitempty"`
	Merchant *Merchant `gorm:"foreignKey:MerchantID" json:"merchant,omitempty"`
}

// WalletAccount 以最小货币单位记录商户余额，绝不使用 float64 做账。
type WalletAccount struct {
	ID               uint      `gorm:"primarykey" json:"id"`
	CreatedAt        time.Time `json:"created_at"`
	UpdatedAt        time.Time `json:"updated_at"`
	MerchantID       uint      `gorm:"not null;uniqueIndex" json:"merchant_id"`
	Currency         string    `gorm:"size:12;not null;default:POINT" json:"currency"`
	AvailableBalance int64     `gorm:"not null;default:0" json:"available_balance"`
	FrozenBalance    int64     `gorm:"not null;default:0" json:"frozen_balance"`
}

// WalletLedgerEntry 记录每一笔余额变化，BalanceAfter 方便审计与对账。
type WalletLedgerEntry struct {
	ID              uint      `gorm:"primarykey" json:"id"`
	CreatedAt       time.Time `json:"created_at"`
	MerchantID      uint      `gorm:"not null;index;uniqueIndex:idx_wallet_ledger_idempotency" json:"merchant_id"`
	WalletAccountID uint      `gorm:"not null;index" json:"wallet_account_id"`
	EntryNo         string    `gorm:"uniqueIndex;size:64;not null" json:"entry_no"`
	Type            string    `gorm:"size:24;not null;index" json:"type"`
	Amount          int64     `gorm:"not null" json:"amount"`
	BalanceAfter    int64     `gorm:"not null" json:"balance_after"`
	ReferenceType   string    `gorm:"size:32;not null" json:"reference_type"`
	ReferenceNo     string    `gorm:"size:96;not null;index" json:"reference_no"`
	IdempotencyKey  *string   `gorm:"uniqueIndex:idx_wallet_ledger_idempotency;size:128" json:"-"`
	Note            string    `gorm:"size:255" json:"note"`
}

// FulfillmentOrder 保留订单状态、商品及请求快照。
type FulfillmentOrder struct {
	ID        uint           `gorm:"primarykey" json:"id"`
	CreatedAt time.Time      `json:"created_at"`
	UpdatedAt time.Time      `json:"updated_at"`
	DeletedAt gorm.DeletedAt `gorm:"index" json:"-"`

	MerchantID            uint       `gorm:"not null;index;uniqueIndex:idx_order_client_no" json:"merchant_id"`
	OrderNo               string     `gorm:"uniqueIndex;size:64;not null" json:"order_no"`
	ClientOrderNo         string     `gorm:"size:96;not null;uniqueIndex:idx_order_client_no" json:"client_order_no"`
	MerchantProductID     uint       `gorm:"not null;index" json:"merchant_product_id"`
	ProductSKU            string     `gorm:"size:96;not null" json:"product_sku"`
	ProductName           string     `gorm:"size:160;not null" json:"product_name"`
	Quantity              int64      `gorm:"not null;default:1" json:"quantity"`
	BaseAmount            int64      `gorm:"not null;default:0" json:"base_amount"`
	FeeType               string     `gorm:"size:16;not null;default:rate" json:"fee_type"`
	FeeRateBP             int64      `gorm:"not null;default:0" json:"fee_rate_bp"`
	FeeFixedAmount        int64      `gorm:"not null;default:0" json:"fee_fixed_amount"`
	ServiceFeeAmount      int64      `gorm:"not null;default:0" json:"service_fee_amount"`
	Amount                int64      `gorm:"not null" json:"amount"`
	Currency              string     `gorm:"size:12;not null;default:POINT" json:"currency"`
	OrderStatus           string     `gorm:"size:16;not null;default:paid;index" json:"order_status"`
	OrderSource           string     `gorm:"size:16;not null;default:api;index" json:"order_source"`
	BuyerReference        string     `gorm:"size:128" json:"buyer_reference"`
	RequestFingerprint    string     `gorm:"size:64;not null;default:'';index" json:"-"`
	RequestData           string     `gorm:"type:text" json:"request_data"`
	ResultData            string     `gorm:"type:text" json:"result_data"`
	ProviderOrderNo       string     `gorm:"size:96;index" json:"provider_order_no"`
	FailureReason         string     `gorm:"size:512" json:"failure_reason"`
	CancelledAt           *time.Time `json:"cancelled_at"`
	DeliveredAt           *time.Time `json:"delivered_at"`
	DeliveryLinkExpiresAt *time.Time `json:"delivery_link_expires_at"`
	DeliveryLinkRevokedAt *time.Time `json:"delivery_link_revoked_at"`

	MerchantProduct *MerchantProduct `gorm:"foreignKey:MerchantProductID" json:"merchant_product,omitempty"`
}

// CallbackSubscription 为商户提供独立、可禁用的事件订阅。
type CallbackSubscription struct {
	ID        uint           `gorm:"primarykey" json:"id"`
	CreatedAt time.Time      `json:"created_at"`
	UpdatedAt time.Time      `json:"updated_at"`
	DeletedAt gorm.DeletedAt `gorm:"index" json:"-"`

	MerchantID       uint   `gorm:"not null;index" json:"merchant_id"`
	Name             string `gorm:"size:128;not null" json:"name"`
	URL              string `gorm:"size:1024;not null" json:"url"`
	Events           string `gorm:"type:text;not null" json:"events"`
	SecretCiphertext string `gorm:"type:text;not null" json:"-"`
	Status           string `gorm:"size:16;not null;default:active;index" json:"status"`
}

// CallbackDelivery 是事务性 outbox 记录；事件 ID 可供接收方做幂等。
type CallbackDelivery struct {
	ID                     uint       `gorm:"primarykey" json:"id"`
	CreatedAt              time.Time  `json:"created_at"`
	UpdatedAt              time.Time  `json:"updated_at"`
	MerchantID             uint       `gorm:"not null;index" json:"merchant_id"`
	CallbackSubscriptionID uint       `gorm:"not null;index" json:"callback_subscription_id"`
	EventID                string     `gorm:"uniqueIndex;size:64;not null" json:"event_id"`
	Event                  string     `gorm:"size:64;not null;index" json:"event"`
	Payload                string     `gorm:"type:text;not null" json:"payload"`
	Status                 string     `gorm:"size:16;not null;default:pending;index" json:"status"`
	Attempts               int        `gorm:"not null;default:0" json:"attempts"`
	NextAttemptAt          time.Time  `gorm:"not null;index" json:"next_attempt_at"`
	LastStatusCode         int        `gorm:"not null;default:0" json:"last_status_code"`
	LastResponse           string     `gorm:"type:text" json:"last_response"`
	DeliveredAt            *time.Time `json:"delivered_at"`

	CallbackSubscription *CallbackSubscription `gorm:"foreignKey:CallbackSubscriptionID" json:"callback_subscription,omitempty"`
}

// APIRequestNonce 使 API 重放保护跨进程、跨重启生效。
type APIRequestNonce struct {
	ID          uint      `gorm:"primarykey" json:"id"`
	CreatedAt   time.Time `json:"created_at"`
	APIClientID uint      `gorm:"not null;uniqueIndex:idx_api_nonce;index" json:"api_client_id"`
	Nonce       string    `gorm:"size:96;not null;uniqueIndex:idx_api_nonce" json:"nonce"`
	ExpiresAt   time.Time `gorm:"not null;index" json:"expires_at"`
}

// SourceAPINonce 记录源头接口的请求 nonce，保证重放保护跨进程、跨重启生效。
type SourceAPINonce struct {
	ID        uint      `gorm:"primarykey" json:"id"`
	CreatedAt time.Time `json:"created_at"`
	APIKey    string    `gorm:"size:96;not null;uniqueIndex:idx_source_api_nonce" json:"-"`
	Nonce     string    `gorm:"size:64;not null;uniqueIndex:idx_source_api_nonce" json:"-"`
	ExpiresAt time.Time `gorm:"not null;index" json:"-"`
}

func (SourceAPINonce) TableName() string {
	return "source_api_nonces"
}

// AuditLog 留存后台和开放接口的重要业务操作。
type AuditLog struct {
	ID          uint      `gorm:"primarykey" json:"id"`
	CreatedAt   time.Time `json:"created_at"`
	MerchantID  *uint     `gorm:"index" json:"merchant_id"`
	ActorUserID *uint     `gorm:"index" json:"actor_user_id"`
	APIClientID *uint     `gorm:"index" json:"api_client_id"`
	RequestID   string    `gorm:"size:64;index" json:"request_id"`
	Action      string    `gorm:"size:96;not null;index" json:"action"`
	EntityType  string    `gorm:"size:64;not null;index" json:"entity_type"`
	EntityID    string    `gorm:"size:96;not null;index" json:"entity_id"`
	Metadata    string    `gorm:"type:text" json:"metadata"`
}