package payment

import (
	"fmt"
	bizpayment "kra/internal/biz/payment"
	"time"

	"github.com/google/uuid"
	"gorm.io/gorm"
)

const DemoTradePrefix = "DEMO-PAY-"

type DemoSeedResult struct {
	Orders int
	Events int
}

// SeedDemoOrders replaces only DEMO-PAY-* records with a representative set
// of payment operations for administration-page review.
func SeedDemoOrders(db *gorm.DB, now time.Time) (*DemoSeedResult, error) {
	if db == nil {
		return nil, fmt.Errorf("demo payment database is nil")
	}
	if !db.Migrator().HasTable(&paymentOrderPO{}) || !db.Migrator().HasTable(&paymentEventPO{}) {
		return nil, fmt.Errorf("payment tables are not migrated")
	}
	if now.IsZero() {
		now = time.Now().UTC().Truncate(time.Second)
	} else {
		now = now.UTC().Truncate(time.Second)
	}

	type demoOrder struct {
		order  paymentOrderPO
		events []paymentEventPO
	}
	makeOrder := func(index int, provider, subject, status, fulfillment, refund string, amount int64, currency string, created time.Time) paymentOrderPO {
		tradeNo := fmt.Sprintf("%s%02d", DemoTradePrefix, index)
		return paymentOrderPO{
			TradeNo: tradeNo, Provider: provider, BusinessType: bizpayment.DemoBusinessType, BusinessID: fmt.Sprintf("DEMO-LICENSE-%02d", index),
			Subject: subject, PaymentMode: bizpayment.PaymentModeExternal, OriginalAmount: amount, Amount: amount,
			Currency: currency, PaymentStatus: status, FulfillmentStatus: fulfillment, RefundStatus: refund,
			ConfirmationID: uuid.NewString(), RequestFingerprint: fmt.Sprintf("demo-fingerprint-%02d", index),
			CreatePayload: "{}", Extra: "{}", Version: 1, CreatedAt: created, UpdatedAt: created,
		}
	}
	makeEvent := func(order paymentOrderPO, eventType, source, status, providerStatus, message string, amount int64, at time.Time) paymentEventPO {
		event := paymentEventPO{
			Provider: order.Provider, TradeNo: order.TradeNo, Type: eventType, Source: source, Status: status,
			ProviderStatus: providerStatus, Message: message, Amount: amount, Currency: order.Currency, CreatedAt: at,
		}
		if source == "client" {
			event.ClientIP, event.UserAgent, event.DeviceID = "111.29.161.79", "Kra-Demo/1.2 Android/16", fmt.Sprintf("DEMO-DEVICE-%s", order.TradeNo)
		}
		if source == "admin" {
			event.OperatorID, event.OperatorName = 1, "demo-admin"
		}
		return event
	}
	providerDate := now.Format("20060102")

	created1, paid1, fulfilled1 := now.Add(-35*time.Minute), now.Add(-34*time.Minute), now.Add(-33*time.Minute)
	paid := makeOrder(1, bizpayment.PaymentAlipay, "专业版 7 天授权", bizpayment.PaymentStatusPaid, bizpayment.FulfillmentStatusSucceeded, bizpayment.RefundStatusNone, 940, "CNY", created1)
	providerTrade1 := fmt.Sprintf("DEMO-ALIPAY-%s%04d", providerDate, 1)
	paid.ProviderTradeNo = &providerTrade1
	paid.ProviderStatus, paid.PaidAmount, paid.PayerPaidAmount, paid.CashPaidAmount, paid.SettlementAmount = "TRADE_SUCCESS", 940, 940, 940, 934
	paid.AmountBreakdownKnown, paid.PaidAt, paid.FulfilledAt, paid.UpdatedAt = true, &paid1, &fulfilled1, fulfilled1

	pendingCreated := now.Add(-28 * time.Minute)
	pending := makeOrder(2, bizpayment.PaymentWechatV3, "专业版 30 天授权", bizpayment.PaymentStatusPending, bizpayment.FulfillmentStatusPending, bizpayment.RefundStatusNone, 2990, "CNY", pendingCreated)
	pending.ProviderStatus = "NOTPAY"
	pending.UpdatedAt = now.Add(-27 * time.Minute)

	failedCreated := now.Add(-24 * time.Minute)
	failed := makeOrder(3, bizpayment.PaymentPayPal, "海外数字商品", bizpayment.PaymentStatusFailed, bizpayment.FulfillmentStatusPending, bizpayment.RefundStatusNone, 1299, "USD", failedCreated)
	failed.ProviderStatus, failed.LastError = "DECLINED", "付款方式被渠道拒绝"
	failed.UpdatedAt = now.Add(-23 * time.Minute)

	fulfillCreated, fulfillPaid := now.Add(-20*time.Minute), now.Add(-19*time.Minute)
	fulfillFailed := makeOrder(4, bizpayment.PaymentAlipayV3, "企业版 90 天授权", bizpayment.PaymentStatusPaid, bizpayment.FulfillmentStatusFailed, bizpayment.RefundStatusNone, 8990, "CNY", fulfillCreated)
	providerTrade4 := fmt.Sprintf("DEMO-ALIPAY-%s%04d", providerDate, 4)
	fulfillFailed.ProviderTradeNo, fulfillFailed.ProviderStatus = &providerTrade4, "TRADE_SUCCESS"
	fulfillFailed.PaidAmount, fulfillFailed.SettlementAmount, fulfillFailed.PaidAt = 8990, 8936, &fulfillPaid
	fulfillFailed.LastError, fulfillFailed.UpdatedAt = "业务授权服务暂时不可用，可人工重试发货", now.Add(-18*time.Minute)

	partialCreated, partialPaid, partialRefunded := now.Add(-16*time.Minute), now.Add(-15*time.Minute), now.Add(-12*time.Minute)
	partial := makeOrder(5, bizpayment.PaymentWechatV3, "团队版 30 天授权", bizpayment.PaymentStatusPartiallyRefunded, bizpayment.FulfillmentStatusSucceeded, bizpayment.RefundStatusPartial, 5000, "CNY", partialCreated)
	providerTrade5 := fmt.Sprintf("DEMO-WECHAT-%s%04d", providerDate, 5)
	partial.ProviderTradeNo, partial.ProviderStatus = &providerTrade5, "SUCCESS"
	partial.PaidAmount, partial.SettlementAmount, partial.RefundedAmount = 5000, 4970, 1200
	partial.PaidAt, partial.FulfilledAt, partial.RefundedAt, partial.UpdatedAt = &partialPaid, &partialPaid, &partialRefunded, partialRefunded

	refundCreated, refundPaid := now.Add(-11*time.Minute), now.Add(-10*time.Minute)
	refundPending := makeOrder(6, bizpayment.PaymentAlipay, "增值服务包", bizpayment.PaymentStatusPaid, bizpayment.FulfillmentStatusSucceeded, bizpayment.RefundStatusPending, 1880, "CNY", refundCreated)
	providerTrade6 := fmt.Sprintf("DEMO-ALIPAY-%s%04d", providerDate, 6)
	refundPending.ProviderTradeNo, refundPending.ProviderStatus = &providerTrade6, "TRADE_SUCCESS"
	refundPending.PaidAmount, refundPending.SettlementAmount, refundPending.RefundRequestedAmount = 1880, 1869, 600
	refundPending.RefundNo, refundPending.PaidAt, refundPending.FulfilledAt, refundPending.UpdatedAt = "DEMO-REFUND-06", &refundPaid, &refundPaid, now.Add(-8*time.Minute)

	refundedCreated, refundedPaid, refundedAt := now.Add(-9*time.Minute), now.Add(-8*time.Minute), now.Add(-5*time.Minute)
	refunded := makeOrder(7, bizpayment.PaymentWechatV3, "体验卡 7 天", bizpayment.PaymentStatusRefunded, bizpayment.FulfillmentStatusSucceeded, bizpayment.RefundStatusSucceeded, 500, "CNY", refundedCreated)
	providerTrade7 := fmt.Sprintf("DEMO-WECHAT-%s%04d", providerDate, 7)
	refunded.ProviderTradeNo, refunded.ProviderStatus = &providerTrade7, "REFUND_SUCCESS"
	refunded.PaidAmount, refunded.SettlementAmount, refunded.RefundedAmount = 500, 497, 500
	refunded.PaidAt, refunded.FulfilledAt, refunded.RefundedAt, refunded.UpdatedAt = &refundedPaid, &refundedPaid, &refundedAt, refundedAt

	internalCreated, internalPaid := now.Add(-4*time.Minute), now.Add(-3*time.Minute)
	internal := makeOrder(8, bizpayment.PaymentInternal, "积分兑换月卡", bizpayment.PaymentStatusPaid, bizpayment.FulfillmentStatusSucceeded, bizpayment.RefundStatusNone, 1200, "POINT", internalCreated)
	internal.PaymentMode, internal.ProviderStatus = bizpayment.PaymentModeInternal, "AUTHORIZED"
	internal.PaidAmount, internal.PointPaidAmount, internal.SettlementAmount, internal.AmountBreakdownKnown = 1200, 1200, 1200, true
	internal.PaidAt, internal.FulfilledAt, internal.UpdatedAt = &internalPaid, &internalPaid, internalPaid

	demos := []demoOrder{
		{paid, []paymentEventPO{makeEvent(paid, bizpayment.PaymentEventOrderCreated, "client", bizpayment.PaymentStatusInitialized, "", "客户端创建订单", paid.Amount, created1), makeEvent(paid, bizpayment.PaymentEventPaymentCallback, bizpayment.PaymentAlipay, bizpayment.PaymentStatusPaid, paid.ProviderStatus, "支付宝异步通知验签并主动查单成功", paid.PaidAmount, paid1), makeEvent(paid, bizpayment.PaymentEventFulfillmentFinished, "system", bizpayment.FulfillmentStatusSucceeded, "", "授权自动激活成功，有效期 7 天", 0, fulfilled1)}},
		{pending, []paymentEventPO{makeEvent(pending, bizpayment.PaymentEventOrderCreated, "client", bizpayment.PaymentStatusInitialized, "", "客户端创建订单", pending.Amount, pendingCreated), makeEvent(pending, bizpayment.PaymentEventProviderCreated, bizpayment.PaymentWechatV3, bizpayment.PaymentStatusPending, pending.ProviderStatus, "预支付订单已创建，等待买家付款", pending.Amount, pending.UpdatedAt)}},
		{failed, []paymentEventPO{makeEvent(failed, bizpayment.PaymentEventOrderCreated, "client", bizpayment.PaymentStatusInitialized, "", "客户端创建订单", failed.Amount, failedCreated), makeEvent(failed, bizpayment.PaymentEventPaymentSynchronized, "admin", bizpayment.PaymentStatusFailed, failed.ProviderStatus, failed.LastError, 0, failed.UpdatedAt)}},
		{fulfillFailed, []paymentEventPO{makeEvent(fulfillFailed, bizpayment.PaymentEventPaymentCallback, bizpayment.PaymentAlipayV3, bizpayment.PaymentStatusPaid, fulfillFailed.ProviderStatus, "支付成功", fulfillFailed.PaidAmount, fulfillPaid), makeEvent(fulfillFailed, bizpayment.PaymentEventFulfillmentFinished, "system", bizpayment.FulfillmentStatusFailed, "", fulfillFailed.LastError, 0, fulfillFailed.UpdatedAt)}},
		{partial, []paymentEventPO{makeEvent(partial, bizpayment.PaymentEventPaymentCallback, bizpayment.PaymentWechatV3, bizpayment.PaymentStatusPaid, partial.ProviderStatus, "支付成功并完成发货", partial.PaidAmount, partialPaid), makeEvent(partial, bizpayment.PaymentEventRefundConfirmed, bizpayment.PaymentWechatV3, bizpayment.RefundStatusPartial, "SUCCESS", "售后部分退款 12.00 CNY", partial.RefundedAmount, partialRefunded)}},
		{refundPending, []paymentEventPO{makeEvent(refundPending, bizpayment.PaymentEventPaymentCallback, bizpayment.PaymentAlipay, bizpayment.PaymentStatusPaid, refundPending.ProviderStatus, "支付成功并完成发货", refundPending.PaidAmount, refundPaid), makeEvent(refundPending, bizpayment.PaymentEventRefundSubmitted, "admin", bizpayment.RefundStatusPending, "", "客户重复购买，退款已提交渠道", refundPending.RefundRequestedAmount, refundPending.UpdatedAt)}},
		{refunded, []paymentEventPO{makeEvent(refunded, bizpayment.PaymentEventPaymentCallback, bizpayment.PaymentWechatV3, bizpayment.PaymentStatusPaid, "SUCCESS", "支付成功并完成发货", refunded.PaidAmount, refundedPaid), makeEvent(refunded, bizpayment.PaymentEventRefundConfirmed, bizpayment.PaymentWechatV3, bizpayment.RefundStatusSucceeded, refunded.ProviderStatus, "原路全额退款成功", refunded.RefundedAmount, refundedAt)}},
		{internal, []paymentEventPO{makeEvent(internal, bizpayment.PaymentEventOrderCreated, "client", bizpayment.PaymentStatusInitialized, "", "创建积分支付订单", internal.Amount, internalCreated), makeEvent(internal, bizpayment.PaymentEventPaymentSynchronized, bizpayment.PaymentInternal, bizpayment.PaymentStatusPaid, internal.ProviderStatus, "积分扣减与授权发放成功", internal.PaidAmount, internalPaid)}},
	}

	result := &DemoSeedResult{}
	err := db.Transaction(func(tx *gorm.DB) error {
		if err := tx.Where("trade_no LIKE ?", DemoTradePrefix+"%").Delete(&paymentEventPO{}).Error; err != nil {
			return err
		}
		if err := tx.Where("trade_no LIKE ?", DemoTradePrefix+"%").Delete(&paymentOrderPO{}).Error; err != nil {
			return err
		}
		for i := range demos {
			if err := tx.Create(&demos[i].order).Error; err != nil {
				return err
			}
			result.Orders++
			if len(demos[i].events) > 0 {
				if err := tx.Create(&demos[i].events).Error; err != nil {
					return err
				}
				result.Events += len(demos[i].events)
			}
		}
		return nil
	})
	return result, err
}