package model

import (
	"time"

	"gorm.io/datatypes"
	"gorm.io/gorm"
)

// RefundRequest 退款申请模型
// 记录退款申请的完整生命周期，包含退款单号、关联订单、金额、状态流转、审批信息等
// 状态流转：1(待审批) → 2(已通过)/3(已拒绝)/4(已退回)，4(已退回) → 1(待审批)
type RefundRequest struct {
	gorm.Model
	BaseModel `gorm:"embedded"`

	// 退款单基础信息
	RefundNo        string `gorm:"column:refund_no;type:varchar(50);uniqueIndex:idx_refund_request_refund_no,where:deleted_at IS NULL;not null;comment:退款单号（RF+日期时间+6位随机数）" json:"refund_no"`
	OrderID         uint   `gorm:"column:order_id;index;not null;comment:关联订单ID" json:"order_id"`
	OrderNo         string `gorm:"column:order_no;type:varchar(30);not null;default:'';comment:关联订单号快照" json:"order_no"`
	OrderType       string `gorm:"column:order_type;type:varchar(20);not null;default:'';comment:订单类型快照（single_card/device）" json:"order_type,omitempty"`
	AssetIdentifier string `gorm:"column:asset_identifier;type:varchar(100);not null;default:'';comment:下单时资产标识符快照（卡为ICCID，设备优先VirtualNo、其次IMEI）" json:"asset_identifier,omitempty"`
	IotCardID       *uint  `gorm:"column:iot_card_id;comment:下单时IoT卡ID快照" json:"iot_card_id,omitempty"`
	DeviceID        *uint  `gorm:"column:device_id;comment:下单时设备ID快照" json:"device_id,omitempty"`
	PackageUsageID  *uint  `gorm:"column:package_usage_id;comment:关联套餐使用记录ID（可选）" json:"package_usage_id,omitempty"`
	ShopID          *uint  `gorm:"column:shop_id;index;comment:店铺ID（从订单获取，用于数据权限过滤）" json:"shop_id,omitempty"`
	ShopName        string `gorm:"column:shop_name;->" json:"shop_name,omitempty"`

	// 金额信息
	ActualReceivedAmount  int64  `gorm:"column:actual_received_amount;type:bigint;not null;comment:实收金额（分）" json:"actual_received_amount"`
	RequestedRefundAmount int64  `gorm:"column:requested_refund_amount;type:bigint;not null;comment:申请退款金额（分）" json:"requested_refund_amount"`
	ApprovedRefundAmount  *int64 `gorm:"column:approved_refund_amount;type:bigint;comment:审批实际退款金额（分）" json:"approved_refund_amount,omitempty"`

	// 退款凭证、原因和状态
	RefundVoucherKey StringJSONBArray `gorm:"column:refund_voucher_key;type:jsonb;not null;comment:退款凭证对象存储file_key列表（jsonb存储[]string）" json:"refund_voucher_key"`
	RefundReason     string           `gorm:"column:refund_reason;type:text;comment:退款原因" json:"refund_reason"`
	Status           int              `gorm:"column:status;type:int;not null;default:1;index;comment:状态 1-待审批 2-已通过 3-已拒绝 4-已退回" json:"status"`

	// 审批信息
	ApprovalInstanceID *uint      `gorm:"column:approval_instance_id;comment:关联的唯一通用审批实例ID" json:"approval_instance_id,omitempty"`
	ProcessorID        *uint      `gorm:"column:processor_id;comment:审批人ID" json:"processor_id,omitempty"`
	ProcessedAt        *time.Time `gorm:"column:processed_at;comment:审批时间" json:"processed_at,omitempty"`
	RejectReason       string     `gorm:"column:reject_reason;type:text;comment:拒绝原因" json:"reject_reason,omitempty"`
	Remark             string     `gorm:"column:remark;type:text;comment:审批备注" json:"remark,omitempty"`

	// 退款方式、冻结实收与当前材料快照
	Method                     string `gorm:"column:method;type:varchar(20);not null;default:'';comment:退款方式，空表示未接入方式的存量申请" json:"method"`
	FrozenActualReceivedAmount int64  `gorm:"column:frozen_actual_received_amount;type:bigint;not null;default:0;comment:冻结的权威实收金额（分）" json:"frozen_actual_received_amount"`
	CustomerAccountInfo        string `gorm:"column:customer_account_info;type:text;not null;default:'';comment:客户收款信息自由文本快照" json:"customer_account_info"`

	// 审批尝试引用，仅用于列表与详情展示
	LatestAttemptID          uint `gorm:"column:latest_attempt_id;type:bigint;not null;default:0;comment:最新审批尝试记录ID，仅用于展示" json:"latest_attempt_id"`
	LatestApprovalInstanceID uint `gorm:"column:latest_approval_instance_id;type:bigint;not null;default:0;comment:最新通用审批实例ID，仅用于展示" json:"latest_approval_instance_id"`

	// 渠道原路退款结果与结构化失败分类
	ChannelRefundStatus    int        `gorm:"column:channel_refund_status;type:smallint;not null;default:0;comment:渠道退款状态 0-未发起或不适用 1-处理中 2-明确成功 3-明确失败" json:"channel_refund_status"`
	ChannelRefundNo        string     `gorm:"column:channel_refund_no;type:varchar(64);not null;default:'';comment:渠道退款流水号" json:"channel_refund_no"`
	ChannelRefundRequestNo string     `gorm:"column:channel_refund_request_no;type:varchar(64);not null;default:'';comment:渠道退款请求号快照" json:"channel_refund_request_no"`
	ChannelRefundAmount    int64      `gorm:"column:channel_refund_amount;type:bigint;not null;default:0;comment:渠道退款金额快照（分）" json:"channel_refund_amount"`
	ChannelRefundedAt      *time.Time `gorm:"column:channel_refunded_at;comment:渠道明确退款成功时间" json:"channel_refunded_at,omitempty"`
	// ChannelSubmittedAt 非空表示该尝试已向渠道提交过退款请求；重投只允许查询，不得再次提交。
	ChannelSubmittedAt *time.Time `gorm:"column:channel_submitted_at;comment:渠道退款请求提交认领时间" json:"channel_submitted_at,omitempty"`
	FailureReason      string     `gorm:"column:failure_reason;type:varchar(32);not null;default:'';comment:结构化失败分类稳定编码" json:"failure_reason"`
	FailureMessage     string     `gorm:"column:failure_message;type:varchar(500);not null;default:'';comment:失败安全摘要" json:"failure_message"`

	// 正交异常标记：企业微信通过后撤销、渠道结果永久未知等情况转人工处理
	AnomalyFlag   int    `gorm:"column:anomaly_flag;type:smallint;not null;default:0;comment:异常标记 0-无异常 1-有异常" json:"anomaly_flag"`
	AnomalyReason string `gorm:"column:anomaly_reason;type:varchar(500);not null;default:'';comment:异常原因" json:"anomaly_reason"`

	// 后处理标记
	CommissionDeducted bool `gorm:"column:commission_deducted;not null;default:false;comment:佣金是否已回扣" json:"commission_deducted"`
	AssetReset         bool `gorm:"column:asset_reset;not null;default:false;comment:退款后资产处理是否完成" json:"asset_reset"`
}

// TableName 指定表名
func (RefundRequest) TableName() string {
	return "tb_refund_request"
}

// RefundRequestAttempt 退款审批尝试记录。
// 每次提交或重提新增一条不可变记录，冻结当次方式、金额、冻结实收、原因、客户收款信息、
// 凭证与套餐使用快照；主键同时作为通用审批业务标识，使同一退款单每次提交持有独立审批实例。
type RefundRequestAttempt struct {
	ID                         uint             `gorm:"column:id;primaryKey;autoIncrement" json:"id"`
	RefundID                   uint             `gorm:"column:refund_id;not null;index" json:"refund_id"`
	AttemptNo                  int              `gorm:"column:attempt_no;type:int;not null" json:"attempt_no"`
	Method                     string           `gorm:"column:method;type:varchar(20);not null" json:"method"`
	RefundAmount               int64            `gorm:"column:refund_amount;type:bigint;not null" json:"refund_amount"`
	FrozenActualReceivedAmount int64            `gorm:"column:frozen_actual_received_amount;type:bigint;not null" json:"frozen_actual_received_amount"`
	RefundReason               string           `gorm:"column:refund_reason;type:text;not null;default:''" json:"refund_reason"`
	CustomerAccountInfo        string           `gorm:"column:customer_account_info;type:text;not null;default:''" json:"customer_account_info"`
	CustomerVoucherKeys        StringJSONBArray `gorm:"column:customer_voucher_keys;type:jsonb;not null" json:"customer_voucher_keys"`
	PackageUsageSnapshot       datatypes.JSON   `gorm:"column:package_usage_snapshot;type:jsonb;not null" json:"package_usage_snapshot"`
	ChannelRefundRequestNo     string           `gorm:"column:channel_refund_request_no;type:varchar(64);not null;default:''" json:"channel_refund_request_no"`
	SubmittedByAccountID       uint             `gorm:"column:submitted_by_account_id;not null" json:"submitted_by_account_id"`
	ApprovalInstanceID         *uint            `gorm:"column:approval_instance_id" json:"approval_instance_id,omitempty"`
	CreatedAt                  time.Time        `gorm:"column:created_at;type:timestamptz;not null;autoCreateTime" json:"created_at"`
}

// TableName 指定审批尝试记录表名。
func (RefundRequestAttempt) TableName() string {
	return "tb_refund_request_attempt"
}

// 退款状态常量
const (
	RefundStatusPending  = 1 // 待审批
	RefundStatusApproved = 2 // 已通过（退款已完成）
	RefundStatusRejected = 3 // 已拒绝
	RefundStatusReturned = 4 // 已退回

	// RefundStatusChannelProcessing 表示企业微信已通过、原路渠道结果尚未确认。
	RefundStatusChannelProcessing = 5
	// RefundStatusChannelFailed 表示原路渠道明确失败或超时可恢复失败。
	RefundStatusChannelFailed = 6
)

// RefundActiveStatuses 返回会阻止同一订单创建新退款申请的状态集合。
// 该集合必须与迁移中 uk_refund_request_active_order 的谓词保持一致。
func RefundActiveStatuses() []int {
	return []int{RefundStatusPending, RefundStatusChannelProcessing, RefundStatusChannelFailed}
}

// RefundResubmittableStatuses 返回允许修改材料并重提的状态集合。
func RefundResubmittableStatuses() []int {
	return []int{RefundStatusRejected, RefundStatusReturned, RefundStatusChannelFailed}
}