package refund

import (
	"context"
	"strings"

	"gorm.io/gorm"

	merchantpayment "github.com/break/junhong_cmp_fiber/internal/application/merchantpayment"
	"github.com/break/junhong_cmp_fiber/internal/model"
	"github.com/break/junhong_cmp_fiber/pkg/errors"
)

// SetPaymentMerchantRuntime 注入冻结商户的当前凭证版本加载器。
func (s *Service) SetPaymentMerchantRuntime(runtime *merchantpayment.RuntimeLoader) {
	s.paymentMerchantRuntime = runtime
}

// preparePaymentRefundCredentials 只为既有套餐订单退款流程装载和校验支付凭证；本 Change
// 不发起任何渠道退款请求。钱包支付和线下支付没有收款商户凭证，直接放行。
// merchant_id 为空仅是留存期内的历史线上支付，独立 Change 清理后才可删除按
// payment_config_id 读取的兼容路径，绝不能按当前商户池推断商户。
func (s *Service) preparePaymentRefundCredentials(ctx context.Context, tx *gorm.DB, orderID uint) error {
	var payment model.Payment
	err := tx.WithContext(ctx).
		Where("order_id = ? AND order_type = ? AND status = ?", orderID, model.PaymentOrderTypePackage, model.PaymentRecordStatusPaid).
		Order("id DESC").
		First(&payment).Error
	if err != nil {
		if err == gorm.ErrRecordNotFound {
			return nil
		}
		return errors.Wrap(errors.CodeDatabaseError, err, "查询退款关联支付单失败")
	}
	// 钱包支付和线下支付没有收款商户凭证，不被本检查阻断。
	if payment.PaymentMethod == model.PaymentByWallet || payment.PaymentMethod == model.PaymentByOffline {
		return nil
	}
	if payment.MerchantID != nil {
		if s.paymentMerchantRuntime == nil {
			return errors.New(errors.CodeServiceUnavailable, "支付商户加载能力未配置")
		}
		merchant, loadErr := s.paymentMerchantRuntime.LoadMerchant(ctx, *payment.MerchantID)
		if loadErr != nil {
			return loadErr
		}
		return validateFrozenMerchantRefundCredentials(merchant)
	}
	if payment.PaymentConfigID == nil {
		return errors.New(errors.CodeNoPaymentConfig, "历史支付单缺少支付配置")
	}
	var legacy model.WechatConfig
	if err := tx.WithContext(ctx).Unscoped().First(&legacy, *payment.PaymentConfigID).Error; err != nil {
		if err == gorm.ErrRecordNotFound {
			return errors.New(errors.CodeNoPaymentConfig, "历史支付配置不可用")
		}
		return errors.Wrap(errors.CodeDatabaseError, err, "读取历史支付配置失败")
	}
	return nil
}

// validateFrozenMerchantRefundCredentials 只判断既有渠道流程所需凭证是否完整。
// 当前系统没有任何渠道原路退款 Adapter，因此返回前不调用微信、支付宝或富友。
func validateFrozenMerchantRefundCredentials(merchant *model.PaymentMerchant) error {
	config, err := merchantpayment.MerchantConfig(merchant, nil)
	if err != nil {
		return err
	}
	switch config.ProviderType {
	case model.ProviderTypeWechat:
		if blank(config.WxMchID, config.WxAPIV3Key, config.WxCertContent, config.WxKeyContent, config.WxSerialNo, config.WxNotifyURL) {
			return errors.New(errors.CodeNoPaymentConfig, "冻结微信商户退款凭证不完整")
		}
	case model.ProviderTypeWechatV2:
		if blank(config.WxMchID, config.WxAPIV2Key, config.WxNotifyURL) {
			return errors.New(errors.CodeNoPaymentConfig, "冻结微信商户退款凭证不完整")
		}
	case model.ProviderTypeFuiou:
		if blank(config.FyInsCd, config.FyMchntCd, config.FyTermID, config.FyPrivateKey, config.FyPublicKey, config.FyAPIURL, config.FyNotifyURL) {
			return errors.New(errors.CodeNoPaymentConfig, "冻结富友商户退款凭证不完整")
		}
	case "alipay":
		if blank(config.AliAppID, config.AliPrivateKey, config.AliPublicKey, config.AliNotifyURL, config.AliReturnURL) {
			return errors.New(errors.CodeNoPaymentConfig, "冻结支付宝商户退款凭证不完整")
		}
	default:
		return errors.New(errors.CodeNoPaymentConfig, "冻结商户不支持现有退款流程")
	}
	return nil
}

func blank(values ...string) bool {
	for _, value := range values {
		if strings.TrimSpace(value) == "" {
			return true
		}
	}
	return false
}