// Package wechat_config 提供微信参数配置管理的业务逻辑服务
// 包含配置的 CRUD、激活/停用、Redis 缓存等功能
package wechat_config

import (
	"context"
	"fmt"
	"strconv"
	"time"

	"github.com/bytedance/sonic"
	"github.com/redis/go-redis/v9"
	"go.uber.org/zap"
	"gorm.io/gorm"

	systemconfigapp "github.com/break/junhong_cmp_fiber/internal/application/systemconfig"
	"github.com/break/junhong_cmp_fiber/internal/model"
	"github.com/break/junhong_cmp_fiber/internal/model/dto"
	"github.com/break/junhong_cmp_fiber/internal/store"
	"github.com/break/junhong_cmp_fiber/internal/store/postgres"
	"github.com/break/junhong_cmp_fiber/pkg/auditfailure"
	"github.com/break/junhong_cmp_fiber/pkg/constants"
	"github.com/break/junhong_cmp_fiber/pkg/errors"
	"github.com/break/junhong_cmp_fiber/pkg/middleware"
)

// Redis 缓存键
const redisActiveConfigKey = "wechat:config:active"

// Service 微信参数配置业务服务
type Service struct {
	store              *postgres.WechatConfigStore
	orderStore         *postgres.OrderStore
	rechargeOrderStore *postgres.RechargeOrderStore
	agentRechargeStore *postgres.AgentRechargeStore
	paymentStore       *postgres.PaymentStore
	audit              systemconfigapp.AuditWriter
	redis              *redis.Client
	logger             *zap.Logger
}

// New 创建微信参数配置服务实例
func New(
	store *postgres.WechatConfigStore,
	orderStore *postgres.OrderStore,
	rechargeOrderStore *postgres.RechargeOrderStore,
	agentRechargeStore *postgres.AgentRechargeStore,
	paymentStore *postgres.PaymentStore,
	audit systemconfigapp.AuditWriter,
	rdb *redis.Client,
	logger *zap.Logger,
) *Service {
	return &Service{
		store:              store,
		orderStore:         orderStore,
		rechargeOrderStore: rechargeOrderStore,
		agentRechargeStore: agentRechargeStore,
		paymentStore:       paymentStore,
		audit:              audit,
		redis:              rdb,
		logger:             logger,
	}
}

// Create 创建微信参数配置
// POST /api/admin/wechat-configs
func (s *Service) Create(ctx context.Context, req *dto.CreateWechatConfigRequest) (*dto.WechatConfigResponse, error) {
	// 根据 provider_type 校验必填字段
	if err := s.validateProviderFields(req); err != nil {
		s.recordAuditFailure(ctx, systemconfigapp.ChangeAudit{
			OperatorID: middleware.GetUserIDFromContext(ctx), OperationType: constants.AuditOperationPaymentConfigCreate,
			Description: "拒绝创建非法支付连接配置", ConfigKey: "payment_config.new:" + req.Name,
			DisplayName: req.Name, Identity: map[string]any{"name": req.Name, "provider_type": req.ProviderType, "credentials_configured": paymentRequestCredentialsConfigured(req)},
			Result: constants.AuditResultDenied, ErrorCode: strconv.Itoa(errors.CodeInvalidParam), ErrorSummary: "支付连接配置字段校验失败",
		})
		return nil, err
	}
	if s.audit == nil {
		return nil, errors.New(errors.CodeInvalidStatus, "支付配置审计接缝未配置")
	}

	var desc *string
	if req.Description != "" {
		desc = &req.Description
	}

	config := &model.WechatConfig{
		Name:               req.Name,
		Description:        desc,
		ProviderType:       req.ProviderType,
		IsActive:           false,
		OaAppID:            req.OaAppID,
		OaAppSecret:        req.OaAppSecret,
		OaToken:            req.OaToken,
		OaAesKey:           req.OaAesKey,
		OaOAuthRedirectURL: req.OaOAuthRedirectURL,
		MiniappAppID:       req.MiniappAppID,
		MiniappAppSecret:   req.MiniappAppSecret,
		WxMchID:            req.WxMchID,
		WxAPIV3Key:         req.WxAPIV3Key,
		WxAPIV2Key:         req.WxAPIV2Key,
		WxCertContent:      req.WxCertContent,
		WxKeyContent:       req.WxKeyContent,
		WxSerialNo:         req.WxSerialNo,
		WxNotifyURL:        req.WxNotifyURL,
		FyInsCd:            req.FyInsCd,
		FyMchntCd:          req.FyMchntCd,
		FyTermID:           req.FyTermID,
		FyPrivateKey:       req.FyPrivateKey,
		FyPublicKey:        req.FyPublicKey,
		FyAPIURL:           req.FyAPIURL,
		FyNotifyURL:        req.FyNotifyURL,

		AliAppID:            req.AliAppID,
		AliPrivateKey:       req.AliPrivateKey,
		AliPublicKey:        req.AliPublicKey,
		AliNotifyURL:        req.AliNotifyURL,
		AliReturnURL:        req.AliReturnURL,
		AliProduction:       req.AliProduction,
		AliPayExpireMinutes: req.AliPayExpireMinutes,
	}
	// 支付宝过期分钟数默认值
	if config.AliPayExpireMinutes == 0 {
		config.AliPayExpireMinutes = model.DefaultAliPayExpireMinutes
	}
	config.Creator = middleware.GetUserIDFromContext(ctx)

	err := s.store.DB().WithContext(ctx).Transaction(func(tx *gorm.DB) error {
		if err := s.store.WithTx(tx).Create(ctx, config); err != nil {
			return err
		}
		return s.writeAudit(ctx, tx, constants.AuditOperationPaymentConfigCreate, "创建支付连接配置", nil, config)
	})
	if err != nil {
		s.recordPaymentFailure(ctx, constants.AuditOperationPaymentConfigCreate, "创建支付连接配置失败", config, err)
		return nil, errors.Wrap(errors.CodeInternalError, err, "创建微信支付配置失败")
	}

	return dto.FromWechatConfigModel(config), nil
}

// List 获取配置列表
// GET /api/admin/wechat-configs
func (s *Service) List(ctx context.Context, req *dto.WechatConfigListRequest) ([]*dto.WechatConfigResponse, int64, error) {
	opts := &store.QueryOptions{
		Page:     req.Page,
		PageSize: req.PageSize,
		OrderBy:  "id DESC",
	}
	if opts.Page == 0 {
		opts.Page = 1
	}
	if opts.PageSize == 0 {
		opts.PageSize = constants.DefaultPageSize
	}

	filters := make(map[string]interface{})
	if req.ProviderType != nil {
		filters["provider_type"] = *req.ProviderType
	}
	filters["is_active"] = req.IsActive

	configs, total, err := s.store.List(ctx, opts, filters)
	if err != nil {
		return nil, 0, errors.Wrap(errors.CodeInternalError, err, "查询微信支付配置列表失败")
	}

	responses := make([]*dto.WechatConfigResponse, len(configs))
	for i, c := range configs {
		responses[i] = dto.FromWechatConfigModel(c)
	}

	return responses, total, nil
}

// Get 获取配置详情
// GET /api/admin/wechat-configs/:id
func (s *Service) Get(ctx context.Context, id uint) (*dto.WechatConfigResponse, error) {
	config, err := s.store.GetByID(ctx, id)
	if err != nil {
		if err == gorm.ErrRecordNotFound {
			return nil, errors.New(errors.CodeWechatConfigNotFound)
		}
		return nil, errors.Wrap(errors.CodeInternalError, err, "获取微信支付配置失败")
	}
	return dto.FromWechatConfigModel(config), nil
}

// Update 更新微信参数配置
// PUT /api/admin/wechat-configs/:id
func (s *Service) Update(ctx context.Context, id uint, req *dto.UpdateWechatConfigRequest) (*dto.WechatConfigResponse, error) {
	config, err := s.store.GetByID(ctx, id)
	if err != nil {
		if err == gorm.ErrRecordNotFound {
			return nil, errors.New(errors.CodeWechatConfigNotFound)
		}
		return nil, errors.Wrap(errors.CodeInternalError, err, "获取微信支付配置失败")
	}
	if s.audit == nil {
		return nil, errors.New(errors.CodeInvalidStatus, "支付配置审计接缝未配置")
	}
	before := *config

	// 合并字段：指针非 nil 时更新，敏感字段空字符串表示保持原值
	if req.Name != nil {
		config.Name = *req.Name
	}
	if req.Description != nil {
		config.Description = req.Description
	}
	if req.ProviderType != nil {
		config.ProviderType = *req.ProviderType
	}

	// OAuth 公众号
	s.mergeStringField(&config.OaAppID, req.OaAppID)
	s.mergeSensitiveField(&config.OaAppSecret, req.OaAppSecret)
	s.mergeSensitiveField(&config.OaToken, req.OaToken)
	s.mergeSensitiveField(&config.OaAesKey, req.OaAesKey)
	s.mergeStringField(&config.OaOAuthRedirectURL, req.OaOAuthRedirectURL)

	// OAuth 小程序
	s.mergeStringField(&config.MiniappAppID, req.MiniappAppID)
	s.mergeSensitiveField(&config.MiniappAppSecret, req.MiniappAppSecret)

	// 微信直连支付
	s.mergeStringField(&config.WxMchID, req.WxMchID)
	s.mergeSensitiveField(&config.WxAPIV3Key, req.WxAPIV3Key)
	s.mergeSensitiveField(&config.WxAPIV2Key, req.WxAPIV2Key)
	s.mergeSensitiveField(&config.WxCertContent, req.WxCertContent)
	s.mergeSensitiveField(&config.WxKeyContent, req.WxKeyContent)
	s.mergeStringField(&config.WxSerialNo, req.WxSerialNo)
	s.mergeStringField(&config.WxNotifyURL, req.WxNotifyURL)

	// 富友支付
	s.mergeStringField(&config.FyInsCd, req.FyInsCd)
	s.mergeStringField(&config.FyMchntCd, req.FyMchntCd)
	s.mergeStringField(&config.FyTermID, req.FyTermID)
	s.mergeSensitiveField(&config.FyPrivateKey, req.FyPrivateKey)
	s.mergeSensitiveField(&config.FyPublicKey, req.FyPublicKey)
	s.mergeStringField(&config.FyAPIURL, req.FyAPIURL)
	s.mergeStringField(&config.FyNotifyURL, req.FyNotifyURL)

	// 支付宝支付
	s.mergeStringField(&config.AliAppID, req.AliAppID)
	s.mergeSensitiveField(&config.AliPrivateKey, req.AliPrivateKey)
	s.mergeSensitiveField(&config.AliPublicKey, req.AliPublicKey)
	s.mergeStringField(&config.AliNotifyURL, req.AliNotifyURL)
	s.mergeStringField(&config.AliReturnURL, req.AliReturnURL)
	if req.AliProduction != nil {
		config.AliProduction = *req.AliProduction
	}
	if req.AliPayExpireMinutes != nil && *req.AliPayExpireMinutes > 0 {
		config.AliPayExpireMinutes = *req.AliPayExpireMinutes
	}

	config.Updater = middleware.GetUserIDFromContext(ctx)

	err = s.store.DB().WithContext(ctx).Transaction(func(tx *gorm.DB) error {
		if err := s.store.WithTx(tx).Update(ctx, config); err != nil {
			return err
		}
		return s.writeAudit(ctx, tx, constants.AuditOperationPaymentConfigUpdate, "更新支付连接配置", &before, config)
	})
	if err != nil {
		s.recordPaymentFailure(ctx, constants.AuditOperationPaymentConfigUpdate, "更新支付连接配置失败", config, err)
		return nil, errors.Wrap(errors.CodeInternalError, err, "更新微信支付配置失败")
	}

	// 如果当前配置处于激活状态，清除缓存
	if config.IsActive {
		s.clearActiveConfigCache(ctx)
	}

	return dto.FromWechatConfigModel(config), nil
}

// Delete 删除微信参数配置
// DELETE /api/admin/wechat-configs/:id
func (s *Service) Delete(ctx context.Context, id uint) error {
	config, err := s.store.GetByID(ctx, id)
	if err != nil {
		if err == gorm.ErrRecordNotFound {
			return errors.New(errors.CodeWechatConfigNotFound)
		}
		return errors.Wrap(errors.CodeInternalError, err, "获取微信支付配置失败")
	}
	if s.audit == nil {
		return errors.New(errors.CodeInvalidStatus, "支付配置审计接缝未配置")
	}

	// 不允许删除正在激活的配置
	if config.IsActive {
		s.recordPaymentDenied(ctx, constants.AuditOperationPaymentConfigDelete, "拒绝删除生效中的支付连接配置", config, errors.CodeWechatConfigActive)
		return errors.New(errors.CodeWechatConfigActive)
	}

	// 检查是否存在待支付订单
	pendingOrders, err := s.store.CountPendingOrdersByConfigID(ctx, id)
	if err != nil {
		return errors.Wrap(errors.CodeInternalError, err, "检查在途订单失败")
	}

	pendingRecharges, err := s.store.CountPendingRechargesByConfigID(ctx, id)
	if err != nil {
		return errors.Wrap(errors.CodeInternalError, err, "检查在途充值失败")
	}

	if pendingOrders > 0 || pendingRecharges > 0 {
		s.recordPaymentDenied(ctx, constants.AuditOperationPaymentConfigDelete, "拒绝删除存在在途业务的支付连接配置", config, errors.CodeWechatConfigHasPendingOrders)
		return errors.New(errors.CodeWechatConfigHasPendingOrders)
	}

	err = s.store.DB().WithContext(ctx).Transaction(func(tx *gorm.DB) error {
		if err := s.store.WithTx(tx).SoftDelete(ctx, id); err != nil {
			return err
		}
		return s.writeAudit(ctx, tx, constants.AuditOperationPaymentConfigDelete, "删除支付连接配置", config, nil)
	})
	if err != nil {
		s.recordPaymentFailure(ctx, constants.AuditOperationPaymentConfigDelete, "删除支付连接配置失败", config, err)
		return errors.Wrap(errors.CodeInternalError, err, "删除微信支付配置失败")
	}

	s.clearActiveConfigCache(ctx)

	return nil
}

// Activate 激活指定配置（同一时间只有一个激活配置）
// POST /api/admin/wechat-configs/:id/activate
func (s *Service) Activate(ctx context.Context, id uint) (*dto.WechatConfigResponse, error) {
	config, err := s.store.GetByID(ctx, id)
	if err != nil {
		if err == gorm.ErrRecordNotFound {
			return nil, errors.New(errors.CodeWechatConfigNotFound)
		}
		return nil, errors.Wrap(errors.CodeInternalError, err, "获取微信支付配置失败")
	}
	if s.audit == nil {
		return nil, errors.New(errors.CodeInvalidStatus, "支付配置审计接缝未配置")
	}
	before := *config

	// 保留原激活配置快照，确保自动停用也进入该配置自身时间线。
	oldActive, oldErr := s.store.GetActive(ctx)

	// 事务内激活
	db := s.store.DB()
	if err := db.WithContext(ctx).Transaction(func(tx *gorm.DB) error {
		if err := s.store.ActivateInTx(ctx, tx, id); err != nil {
			return err
		}
		after := before
		after.IsActive = true
		if oldErr == nil && oldActive != nil && oldActive.ID != id {
			oldAfter := *oldActive
			oldAfter.IsActive = false
			if err := s.writeAudit(ctx, tx, constants.AuditOperationPaymentConfigDeactivate, "激活其他配置时停用原支付连接配置", oldActive, &oldAfter); err != nil {
				return err
			}
		}
		return s.writeAudit(ctx, tx, constants.AuditOperationPaymentConfigActivate, "激活支付连接配置", &before, &after)
	}); err != nil {
		s.recordPaymentFailure(ctx, constants.AuditOperationPaymentConfigActivate, "激活支付连接配置失败", config, err)
		return nil, errors.Wrap(errors.CodeInternalError, err, "激活微信支付配置失败")
	}

	s.clearActiveConfigCache(ctx)

	// 重新查询最新状态
	config, _ = s.store.GetByID(ctx, id)

	return dto.FromWechatConfigModel(config), nil
}

// Deactivate 停用指定配置
// POST /api/admin/wechat-configs/:id/deactivate
func (s *Service) Deactivate(ctx context.Context, id uint) (*dto.WechatConfigResponse, error) {
	config, err := s.store.GetByID(ctx, id)
	if err != nil {
		if err == gorm.ErrRecordNotFound {
			return nil, errors.New(errors.CodeWechatConfigNotFound)
		}
		return nil, errors.Wrap(errors.CodeInternalError, err, "获取微信支付配置失败")
	}
	if s.audit == nil {
		return nil, errors.New(errors.CodeInvalidStatus, "支付配置审计接缝未配置")
	}
	before := *config
	after := before
	after.IsActive = false

	err = s.store.DB().WithContext(ctx).Transaction(func(tx *gorm.DB) error {
		if err := s.store.WithTx(tx).Deactivate(ctx, id); err != nil {
			return err
		}
		return s.writeAudit(ctx, tx, constants.AuditOperationPaymentConfigDeactivate, "停用支付连接配置", &before, &after)
	})
	if err != nil {
		s.recordPaymentFailure(ctx, constants.AuditOperationPaymentConfigDeactivate, "停用支付连接配置失败", config, err)
		return nil, errors.Wrap(errors.CodeInternalError, err, "停用微信支付配置失败")
	}

	s.clearActiveConfigCache(ctx)

	// 重新查询最新状态
	config, _ = s.store.GetByID(ctx, id)

	return dto.FromWechatConfigModel(config), nil
}

func (s *Service) writeAudit(ctx context.Context, tx *gorm.DB, operation, description string, before, after *model.WechatConfig) error {
	config := after
	if config == nil {
		config = before
	}
	resourceID := strconv.FormatUint(uint64(config.ID), 10)
	requestID := ""
	if value := middleware.GetRequestIDFromContext(ctx); value != nil {
		requestID = *value
	}
	return s.audit.WriteConfigChange(ctx, tx, systemconfigapp.ChangeAudit{
		OperatorID: middleware.GetUserIDFromContext(ctx), OperationType: operation, Description: description,
		ConfigKey: "payment_config." + resourceID, Module: "payment", ResourceID: &resourceID,
		DisplayName: config.Name, Identity: paymentConfigIdentity(config),
		BeforeData: paymentConfigAuditSnapshot(before), AfterData: paymentConfigAuditSnapshot(after),
		RequestID: requestID, CorrelationID: requestID,
	})
}

func (s *Service) recordPaymentDenied(ctx context.Context, operation, description string, config *model.WechatConfig, code int) {
	s.recordAuditFailure(ctx, paymentFailureAudit(ctx, operation, description, config, constants.AuditResultDenied, code))
}

func (s *Service) recordPaymentFailure(ctx context.Context, operation, description string, config *model.WechatConfig, _ error) {
	s.recordAuditFailure(ctx, paymentFailureAudit(ctx, operation, description, config, constants.AuditResultFailed, errors.CodeDatabaseError))
}

func (s *Service) recordAuditFailure(ctx context.Context, audit systemconfigapp.ChangeAudit) {
	if s.audit == nil || s.store == nil || s.store.DB() == nil || audit.OperatorID == 0 || audit.ConfigKey == "" {
		return
	}
	if value := middleware.GetRequestIDFromContext(ctx); value != nil {
		audit.RequestID = *value
		audit.CorrelationID = *value
	}
	if err := s.store.DB().WithContext(ctx).Transaction(func(tx *gorm.DB) error {
		return s.audit.WriteConfigChange(ctx, tx, audit)
	}); err != nil {
		auditfailure.RecordSecondaryWriteFailure(audit.OperationType, audit.ConfigKey, audit.RequestID, audit.CorrelationID, audit.ErrorCode, err)
	}
}

func paymentFailureAudit(ctx context.Context, operation, description string, config *model.WechatConfig, result string, code int) systemconfigapp.ChangeAudit {
	resourceID := strconv.FormatUint(uint64(config.ID), 10)
	return systemconfigapp.ChangeAudit{
		OperatorID: middleware.GetUserIDFromContext(ctx), OperationType: operation, Description: description,
		ConfigKey: "payment_config." + resourceID, Module: "payment", ResourceID: &resourceID,
		DisplayName: config.Name, Identity: paymentConfigIdentity(config), BeforeData: paymentConfigAuditSnapshot(config),
		Result: result, ErrorCode: strconv.Itoa(code), ErrorSummary: description,
	}
}

func paymentConfigIdentity(config *model.WechatConfig) map[string]any {
	if config == nil {
		return nil
	}
	return map[string]any{
		"id": config.ID, "name": config.Name, "provider_type": config.ProviderType,
		"is_active": config.IsActive, "credentials_configured": paymentConfigCredentialsConfigured(config),
	}
}

func paymentConfigAuditSnapshot(config *model.WechatConfig) map[string]any {
	if config == nil {
		return nil
	}
	return map[string]any{
		"id": config.ID, "name": config.Name, "description": config.Description,
		"provider_type": config.ProviderType, "is_active": config.IsActive,
		"oa_app_id": config.OaAppID, "oa_oauth_redirect_url": config.OaOAuthRedirectURL,
		"miniapp_app_id": config.MiniappAppID, "wx_mch_id": config.WxMchID,
		"wx_serial_no": config.WxSerialNo, "wx_notify_url": config.WxNotifyURL,
		"fy_ins_cd": config.FyInsCd, "fy_mchnt_cd": config.FyMchntCd, "fy_term_id": config.FyTermID,
		"fy_api_url": config.FyAPIURL, "fy_notify_url": config.FyNotifyURL,
		"ali_app_id": config.AliAppID, "ali_notify_url": config.AliNotifyURL,
		"ali_return_url": config.AliReturnURL, "ali_production": config.AliProduction,
		"ali_pay_expire_minutes":    config.AliPayExpireMinutes,
		"credentials_configured":    paymentConfigCredentialsConfigured(config),
		"oauth_configured":          config.OaAppSecret != "" || config.OaToken != "" || config.OaAesKey != "" || config.MiniappAppSecret != "",
		"wechat_payment_configured": config.WxAPIV3Key != "" || config.WxAPIV2Key != "" || config.WxCertContent != "" || config.WxKeyContent != "",
		"fuiou_configured":          config.FyPrivateKey != "" || config.FyPublicKey != "",
		"alipay_configured":         config.AliPrivateKey != "" || config.AliPublicKey != "",
	}
}

func paymentConfigCredentialsConfigured(config *model.WechatConfig) bool {
	if config == nil {
		return false
	}
	return config.OaAppSecret != "" || config.OaToken != "" || config.OaAesKey != "" || config.MiniappAppSecret != "" ||
		config.WxAPIV3Key != "" || config.WxAPIV2Key != "" || config.WxCertContent != "" || config.WxKeyContent != "" ||
		config.FyPrivateKey != "" || config.FyPublicKey != "" || config.AliPrivateKey != "" || config.AliPublicKey != ""
}

func paymentRequestCredentialsConfigured(request *dto.CreateWechatConfigRequest) bool {
	return request != nil && (request.OaAppSecret != "" || request.OaToken != "" || request.OaAesKey != "" || request.MiniappAppSecret != "" ||
		request.WxAPIV3Key != "" || request.WxAPIV2Key != "" || request.WxCertContent != "" || request.WxKeyContent != "" ||
		request.FyPrivateKey != "" || request.FyPublicKey != "" || request.AliPrivateKey != "" || request.AliPublicKey != "")
}

// GetActiveConfig 获取当前生效的支付配置（带 Redis 缓存）
// 缓存策略：命中直接返回，未命中查 DB 后缓存 5 分钟，无记录缓存 "none" 1 分钟
func (s *Service) GetActiveConfig(ctx context.Context) (*model.WechatConfig, error) {
	// 尝试从 Redis 获取
	val, err := s.redis.Get(ctx, redisActiveConfigKey).Result()
	if err == nil {
		if val == "none" {
			return nil, nil
		}
		var config model.WechatConfig
		if err := sonic.UnmarshalString(val, &config); err == nil {
			return &config, nil
		}
	}

	// Redis 未命中，查询数据库
	config, err := s.store.GetActive(ctx)
	if err != nil {
		if err == gorm.ErrRecordNotFound {
			// 无激活配置，缓存空标记 1 分钟
			s.redis.Set(ctx, redisActiveConfigKey, "none", 1*time.Minute)
			return nil, nil
		}
		return nil, errors.Wrap(errors.CodeInternalError, err, "查询激活配置失败")
	}

	// 缓存配置 5 分钟
	if data, err := sonic.MarshalString(config); err == nil {
		s.redis.Set(ctx, redisActiveConfigKey, data, 5*time.Minute)
	}

	return config, nil
}

// GetActiveConfigForAPI 获取当前生效的支付配置（API 响应，已脱敏）
func (s *Service) GetActiveConfigForAPI(ctx context.Context) (*dto.WechatConfigResponse, error) {
	config, err := s.GetActiveConfig(ctx)
	if err != nil {
		return nil, err
	}
	if config == nil {
		return nil, nil
	}
	return dto.FromWechatConfigModel(config), nil
}

// clearActiveConfigCache 清除激活配置的 Redis 缓存
func (s *Service) clearActiveConfigCache(ctx context.Context) {
	if err := s.redis.Del(ctx, redisActiveConfigKey).Err(); err != nil {
		s.logger.Warn("清除微信支付配置缓存失败", zap.Error(err))
	}
}

// validateProviderFields 根据支付渠道类型校验必填字段
func (s *Service) validateProviderFields(req *dto.CreateWechatConfigRequest) error {
	switch req.ProviderType {
	case model.ProviderTypeWechat:
		if req.WxMchID == "" || req.WxAPIV3Key == "" || req.WxCertContent == "" ||
			req.WxKeyContent == "" || req.WxSerialNo == "" || req.WxNotifyURL == "" {
			return errors.New(errors.CodeInvalidParam, "微信直连支付必填字段不完整：wx_mch_id, wx_api_v3_key, wx_cert_content, wx_key_content, wx_serial_no, wx_notify_url")
		}
	case model.ProviderTypeFuiou:
		if req.FyInsCd == "" || req.FyMchntCd == "" || req.FyTermID == "" ||
			req.FyPrivateKey == "" || req.FyPublicKey == "" || req.FyAPIURL == "" || req.FyNotifyURL == "" {
			return errors.New(errors.CodeInvalidParam, "富友支付必填字段不完整：fy_ins_cd, fy_mchnt_cd, fy_term_id, fy_private_key, fy_public_key, fy_api_url, fy_notify_url")
		}
	}
	return nil
}

// mergeStringField 合并普通字符串字段：指针非 nil 时用新值覆盖
func (s *Service) mergeStringField(target *string, newVal *string) {
	if newVal != nil {
		*target = *newVal
	}
}

// mergeSensitiveField 合并敏感字段：指针非 nil 且非空字符串时覆盖，空字符串保持原值
func (s *Service) mergeSensitiveField(target *string, newVal *string) {
	if newVal != nil && *newVal != "" {
		*target = *newVal
	}
}

// GetConfigForCallback 按订单号查找创建该订单时所用的支付配置（含已软删除/停用的记录）
// 回调验签必须使用创建订单时的密钥，否则签名不匹配。
// 若找不到 payment_config_id（旧订单或数据缺失），回退到当前激活配置。
func (s *Service) GetConfigForCallback(ctx context.Context, orderNo string) (*model.WechatConfig, error) {
	configID, err := s.resolvePaymentConfigID(ctx, orderNo)
	if err != nil {
		s.logger.Warn("回调：查询订单 payment_config_id 失败，回退激活配置",
			zap.String("order_no", orderNo),
			zap.Error(err),
		)
	}

	if configID != nil {
		cfg, err := s.store.GetByIDUnscoped(ctx, *configID)
		if err == nil {
			return cfg, nil
		}
		s.logger.Warn("回调：按 config_id 加载配置失败，回退激活配置",
			zap.Uint("config_id", *configID),
			zap.Error(err),
		)
	}

	return s.GetActiveConfig(ctx)
}

// resolvePaymentConfigID 按订单号前缀从对应表中取 payment_config_id
func (s *Service) resolvePaymentConfigID(ctx context.Context, orderNo string) (*uint, error) {
	if s.paymentStore != nil {
		payment, err := s.paymentStore.GetByPaymentNo(ctx, orderNo)
		if err == nil {
			if payment.PaymentConfigID != nil {
				return payment.PaymentConfigID, nil
			}
		} else if err != gorm.ErrRecordNotFound {
			return nil, err
		}
	}

	switch {
	case len(orderNo) >= 3 && orderNo[:3] == "ORD":
		order, err := s.orderStore.GetByOrderNo(ctx, orderNo)
		if err != nil {
			return nil, err
		}
		return order.PaymentConfigID, nil

	case len(orderNo) >= 4 && orderNo[:4] == constants.AssetRechargeOrderPrefix:
		record, err := s.rechargeOrderStore.GetByRechargeOrderNo(ctx, orderNo)
		if err != nil {
			return nil, err
		}
		return record.PaymentConfigID, nil

	case len(orderNo) >= 4 && orderNo[:4] == constants.AgentRechargeOrderPrefix:
		record, err := s.agentRechargeStore.GetByRechargeNo(ctx, orderNo)
		if err != nil {
			return nil, err
		}
		return record.PaymentConfigID, nil

	default:
		return nil, fmt.Errorf("未知订单号前缀: %s", orderNo)
	}
}