package payment

import (
	"context"
	"errors"
	bizpayment "kra/internal/biz/payment"
	"time"

	"gorm.io/gorm"
)

type paymentEventPO struct {
	ID             uint64    `gorm:"primaryKey"`
	Provider       string    `gorm:"size:64;not null;index:idx_pay_events_order,priority:1"`
	TradeNo        string    `gorm:"size:128;not null;index:idx_pay_events_order,priority:2"`
	Type           string    `gorm:"size:64;not null;index"`
	Source         string    `gorm:"size:64;not null;index"`
	Status         string    `gorm:"size:64"`
	ProviderStatus string    `gorm:"size:64"`
	Message        string    `gorm:"size:512"`
	EventID        string    `gorm:"size:128;index"`
	PayloadHash    string    `gorm:"size:64"`
	Amount         int64     `gorm:"not null;default:0"`
	Currency       string    `gorm:"size:16"`
	OperatorID     uint      `gorm:"index"`
	OperatorName   string    `gorm:"size:128"`
	ClientIP       string    `gorm:"size:64"`
	UserAgent      string    `gorm:"size:512"`
	DeviceID       string    `gorm:"size:128"`
	CreatedAt      time.Time `gorm:"index"`
}

func (paymentEventPO) TableName() string { return "pay_events" }

func toBizPaymentEvent(po *paymentEventPO) *bizpayment.PaymentEvent {
	if po == nil {
		return nil
	}
	return &bizpayment.PaymentEvent{
		ID: po.ID, Provider: po.Provider, TradeNo: po.TradeNo, Type: po.Type, Source: po.Source,
		Status: po.Status, ProviderStatus: po.ProviderStatus, Message: po.Message, EventID: po.EventID,
		PayloadHash: po.PayloadHash, Amount: po.Amount, Currency: po.Currency, OperatorID: po.OperatorID,
		OperatorName: po.OperatorName, ClientIP: po.ClientIP, UserAgent: po.UserAgent, DeviceID: po.DeviceID,
		CreatedAt: po.CreatedAt,
	}
}

func appendPaymentEvent(ctx context.Context, tx *gorm.DB, order *paymentOrderPO, event *bizpayment.PaymentEvent) error {
	if tx == nil || order == nil || event == nil {
		return nil
	}
	eventType := trimTo(event.Type, 64)
	if eventType == "" {
		return errors.New("支付事件类型为空")
	}
	operation := bizpayment.PaymentOperationFromContext(ctx)
	source := trimTo(event.Source, 64)
	if source == "" {
		source = trimTo(operation.Source, 64)
	}
	if source == "" {
		source = "system"
	}
	message := trimTo(event.Message, 512)
	if message == "" {
		message = trimTo(operation.Reason, 512)
	}
	operatorID := event.OperatorID
	if operatorID == 0 {
		operatorID = operation.OperatorID
	}
	operatorName := trimTo(event.OperatorName, 128)
	if operatorName == "" {
		operatorName = trimTo(operation.OperatorName, 128)
	}
	clientIP := trimTo(event.ClientIP, 64)
	if clientIP == "" {
		clientIP = trimTo(operation.ClientIP, 64)
	}
	userAgent := trimTo(event.UserAgent, 512)
	if userAgent == "" {
		userAgent = trimTo(operation.UserAgent, 512)
	}
	deviceID := trimTo(event.DeviceID, 128)
	if deviceID == "" {
		deviceID = trimTo(operation.DeviceID, 128)
	}
	return tx.Create(&paymentEventPO{
		Provider: order.Provider, TradeNo: order.TradeNo, Type: eventType, Source: source,
		Status: trimTo(event.Status, 64), ProviderStatus: trimTo(event.ProviderStatus, 64), Message: message,
		EventID: trimTo(event.EventID, 128), PayloadHash: trimTo(event.PayloadHash, 64), Amount: event.Amount,
		Currency: trimTo(event.Currency, 16), OperatorID: operatorID, OperatorName: operatorName,
		ClientIP: clientIP, UserAgent: userAgent, DeviceID: deviceID,
	}).Error
}

func savePaymentOrderWithEvent(ctx context.Context, tx *gorm.DB, order *paymentOrderPO, event *bizpayment.PaymentEvent) error {
	if err := tx.Save(order).Error; err != nil {
		return err
	}
	return appendPaymentEvent(ctx, tx, order, event)
}

func (r *paymentOrderRepo) ListPaymentEvents(ctx context.Context, provider, tradeNo string, limit int) ([]*bizpayment.PaymentEvent, error) {
	if limit <= 0 {
		limit = 100
	}
	if limit > 500 {
		limit = 500
	}
	var rows []paymentEventPO
	if err := r.data.DB().WithContext(ctx).
		Where("provider = ? AND trade_no = ?", provider, tradeNo).
		Order("id DESC").Limit(limit).Find(&rows).Error; err != nil {
		return nil, err
	}
	items := make([]*bizpayment.PaymentEvent, 0, len(rows))
	for i := range rows {
		items = append(items, toBizPaymentEvent(&rows[i]))
	}
	return items, nil
}