package api

import (
	"context"
	"errors"
	"tyapi-server/internal/application/api/commands"
	"tyapi-server/internal/application/api/dto"
	"tyapi-server/internal/config"
	entities "tyapi-server/internal/domains/api/entities"
	"tyapi-server/internal/domains/api/repositories"
	"tyapi-server/internal/domains/api/services"
	"tyapi-server/internal/domains/api/services/processors"
	finance_services "tyapi-server/internal/domains/finance/services"
	product_services "tyapi-server/internal/domains/product/services"
	"tyapi-server/internal/shared/crypto"
	"tyapi-server/internal/shared/database"
	"tyapi-server/internal/shared/interfaces"

	"go.uber.org/zap"
)

type ApiApplicationService interface {
	CallApi(ctx context.Context, cmd *commands.ApiCallCommand) (string, string, error)

	// 获取用户API密钥
	GetUserApiKeys(ctx context.Context, userID string) (*dto.ApiKeysResponse, error)

	// 用户白名单管理
	GetUserWhiteList(ctx context.Context, userID string) (*dto.WhiteListListResponse, error)
	AddWhiteListIP(ctx context.Context, userID string, ipAddress string) error
	DeleteWhiteListIP(ctx context.Context, userID string, ipAddress string) error

	// 获取用户API调用记录
	GetUserApiCalls(ctx context.Context, userID string, filters map[string]interface{}, options interfaces.ListOptions) (*dto.ApiCallListResponse, error)
}

type ApiApplicationServiceImpl struct {
	apiCallService             services.ApiCallAggregateService
	apiUserService             services.ApiUserAggregateService
	apiRequestService          *services.ApiRequestService
	apiCallRepository          repositories.ApiCallRepository
	walletService              finance_services.WalletAggregateService
	productManagementService   *product_services.ProductManagementService
	productSubscriptionService *product_services.ProductSubscriptionService
	txManager                  *database.TransactionManager
	config                     *config.Config
	logger                     *zap.Logger
}

func NewApiApplicationService(apiCallService services.ApiCallAggregateService, apiUserService services.ApiUserAggregateService, apiRequestService *services.ApiRequestService, apiCallRepository repositories.ApiCallRepository, walletService finance_services.WalletAggregateService, productManagementService *product_services.ProductManagementService, productSubscriptionService *product_services.ProductSubscriptionService, txManager *database.TransactionManager, config *config.Config, logger *zap.Logger) ApiApplicationService {
	return &ApiApplicationServiceImpl{apiCallService: apiCallService, apiUserService: apiUserService, apiRequestService: apiRequestService, apiCallRepository: apiCallRepository, walletService: walletService, productManagementService: productManagementService, productSubscriptionService: productSubscriptionService, txManager: txManager, config: config, logger: logger}
}

// CallApi 应用服务层统一入口
func (s *ApiApplicationServiceImpl) CallApi(ctx context.Context, cmd *commands.ApiCallCommand) (string, string, error) {
	// 在事务外创建ApiCall
	apiCall, err := s.apiCallService.CreateApiCall(cmd.AccessId, cmd.Data, cmd.ClientIP)
	if err != nil {
		s.logger.Error("创建ApiCall失败", zap.Error(err))
		return "", "", ErrSystem
	}
	transactionId := apiCall.TransactionId

	// 先保存初始状态
	err = s.apiCallService.SaveApiCall(ctx, apiCall)
	if err != nil {
		s.logger.Error("保存ApiCall初始状态失败", zap.Error(err))
		return "", "", ErrSystem
	}

	var encryptedResponse string
	var businessError error

	// 在事务中执行业务逻辑
	err = s.txManager.ExecuteInTx(ctx, func(txCtx context.Context) error {
		// 1. 查ApiUser
		apiUser, err := s.apiUserService.LoadApiUserByAccessId(txCtx, cmd.AccessId)
		if err != nil {
			s.logger.Error("查ApiUser失败", zap.Error(err))
			businessError = ErrInvalidAccessId
			return ErrInvalidAccessId
		}
		// 加入UserId
		apiCall.UserId = &apiUser.UserId
		if apiUser.IsFrozen() {
			s.logger.Error("账户已冻结", zap.String("userId", apiUser.UserId))
			businessError = ErrFrozenAccount
			return ErrFrozenAccount
		}
		// 在开发环境下跳过IP白名单校验
		if s.config.App.IsDevelopment() {
			s.logger.Info("开发环境跳过IP白名单校验", zap.String("userId", apiUser.UserId), zap.String("ip", cmd.ClientIP))
		} else {
			if !apiUser.IsWhiteListed(cmd.ClientIP) {
				s.logger.Error("IP不在白名单内", zap.String("userId", apiUser.UserId), zap.String("ip", cmd.ClientIP))
				businessError = ErrInvalidIP
				return ErrInvalidIP
			}
		}
		// 2. 查钱包
		wallet, err := s.walletService.LoadWalletByUserId(txCtx, apiUser.UserId)
		if err != nil {
			s.logger.Error("查钱包失败", zap.Error(err))
			businessError = ErrSystem
			return ErrSystem
		}
		if wallet.IsArrears() {
			s.logger.Error("账户已欠费", zap.String("userId", apiUser.UserId))
			businessError = ErrArrears
			return ErrArrears
		}

		// 3. 查产品
		product, err := s.productManagementService.GetProductByCode(txCtx, cmd.ApiName)
		if err != nil {
			s.logger.Error("查产品失败", zap.Error(err))
			businessError = ErrProductNotFound
			return ErrProductNotFound
		}
		// 4. 查订阅
		subscription, err := s.productSubscriptionService.GetUserSubscribedProduct(txCtx, apiUser.UserId, product.ID)
		if err != nil {
			s.logger.Error("查订阅失败", zap.Error(err))
			businessError = ErrSystem
			return ErrSystem
		}
		if subscription == nil {
			s.logger.Error("用户未订阅该产品", zap.String("userId", apiUser.UserId), zap.String("productId", product.ID))
			businessError = ErrNotSubscribed
			return ErrNotSubscribed
		}
		apiCall.ProductId = &product.ID
		if !product.IsValid() {
			s.logger.Error("产品已停用", zap.String("productId", product.ID))
			businessError = ErrProductDisabled
			return ErrProductDisabled
		}
		// 5. 解密参数
		requestParams, err := crypto.AesDecrypt(cmd.Data, apiUser.SecretKey)
		if err != nil {
			s.logger.Error("解密参数失败", zap.Error(err))
			businessError = ErrDecryptFail
			return ErrDecryptFail
		}

		// 6. 调用API
		response, err := s.apiRequestService.PreprocessRequestApi(txCtx, cmd.ApiName, requestParams, &cmd.Options)
		if err != nil {
			if errors.Is(err, processors.ErrDatasource) {
				s.logger.Error("调用API失败", zap.Error(err))
				businessError = ErrSystem
				return ErrSystem
			} else if errors.Is(err, processors.ErrInvalidParam) {
				s.logger.Error("调用API失败", zap.Error(err))
				businessError = ErrInvalidParam
				return ErrInvalidParam
			} else if errors.Is(err, processors.ErrNotFound) {
				s.logger.Error("调用API失败", zap.Error(err))
				businessError = ErrQueryEmpty
				return ErrQueryEmpty
			} else {
				s.logger.Error("调用API失败", zap.Error(err))
				businessError = ErrSystem
				return ErrSystem
			}
		}

		// 7. 加密响应
		encryptedResponse, err = crypto.AesEncrypt(response, apiUser.SecretKey)
		if err != nil {
			s.logger.Error("加密响应失败", zap.Error(err))
			businessError = ErrSystem
			return ErrSystem
		}
		apiCall.ResponseData = &encryptedResponse

		// 8. 更新订阅使用次数
		subscription.IncrementAPIUsage(1)
		err = s.productSubscriptionService.SaveSubscription(txCtx, subscription)
		if err != nil {
			s.logger.Error("保存订阅失败", zap.Error(err))
			businessError = ErrSystem
			return ErrSystem
		}

		// 9. 扣钱
		err = s.walletService.Deduct(txCtx, apiUser.UserId, subscription.Price, apiCall.ID, transactionId, product.ID)
		if err != nil {
			s.logger.Error("扣钱失败", zap.Error(err))
			businessError = ErrSystem
			return ErrSystem
		}
		apiCall.Cost = &subscription.Price

		// 10. 标记成功
		apiCall.MarkSuccess(encryptedResponse, subscription.Price)
		return nil
	})

	// 根据事务结果更新ApiCall状态
	if err != nil {
		// 事务失败，根据错误类型标记ApiCall
		if businessError != nil {
			// 使用业务错误类型
			switch businessError {
			case ErrInvalidAccessId:
				apiCall.MarkFailed(entities.ApiCallErrorInvalidAccess, err.Error())
			case ErrFrozenAccount:
				apiCall.MarkFailed(entities.ApiCallErrorFrozenAccount, "")
			case ErrInvalidIP:
				apiCall.MarkFailed(entities.ApiCallErrorInvalidIP, "")
			case ErrArrears:
				apiCall.MarkFailed(entities.ApiCallErrorArrears, "")
			case ErrProductNotFound:
				apiCall.MarkFailed(entities.ApiCallErrorProductNotFound, err.Error())
			case ErrProductDisabled:
				apiCall.MarkFailed(entities.ApiCallErrorProductDisabled, "")
			case ErrNotSubscribed:
				apiCall.MarkFailed(entities.ApiCallErrorNotSubscribed, "")
			case ErrDecryptFail:
				apiCall.MarkFailed(entities.ApiCallErrorDecryptFail, err.Error())
			case ErrInvalidParam:
				apiCall.MarkFailed(entities.ApiCallErrorInvalidParam, err.Error())
			case ErrQueryEmpty:
				apiCall.MarkFailed(entities.ApiCallErrorQueryEmpty, "")
			default:
				apiCall.MarkFailed(entities.ApiCallErrorSystem, err.Error())
			}
		} else {
			// 系统错误
			apiCall.MarkFailed(entities.ApiCallErrorSystem, err.Error())
		}
	}

	// 保存最终状态
	err = s.apiCallService.SaveApiCall(ctx, apiCall)
	if err != nil {
		s.logger.Error("保存ApiCall最终状态失败", zap.Error(err))
		// 即使保存失败，也返回业务结果
	}

	if businessError != nil {
		return transactionId, "", businessError
	}

	return transactionId, encryptedResponse, nil
}

// GetUserApiKeys 获取用户API密钥
func (s *ApiApplicationServiceImpl) GetUserApiKeys(ctx context.Context, userID string) (*dto.ApiKeysResponse, error) {
	apiUser, err := s.apiUserService.LoadApiUserByUserId(ctx, userID)
	if err != nil {
		return nil, err
	}

	return &dto.ApiKeysResponse{
		ID:        apiUser.ID,
		UserID:    apiUser.UserId,
		AccessID:  apiUser.AccessId,
		SecretKey: apiUser.SecretKey,
		Status:    apiUser.Status,
		CreatedAt: apiUser.CreatedAt,
		UpdatedAt: apiUser.UpdatedAt,
	}, nil
}

// GetUserWhiteList 获取用户白名单列表
func (s *ApiApplicationServiceImpl) GetUserWhiteList(ctx context.Context, userID string) (*dto.WhiteListListResponse, error) {
	apiUser, err := s.apiUserService.LoadApiUserByUserId(ctx, userID)
	if err != nil {
		return nil, err
	}

	// 确保WhiteList不为nil
	if apiUser.WhiteList == nil {
		apiUser.WhiteList = []string{}
	}

	// 将白名单字符串数组转换为响应格式
	var items []dto.WhiteListResponse
	for _, ip := range apiUser.WhiteList {
		items = append(items, dto.WhiteListResponse{
			ID:        apiUser.ID, // 使用API用户ID作为标识
			UserID:    apiUser.UserId,
			IPAddress: ip,
			CreatedAt: apiUser.CreatedAt, // 使用API用户创建时间
		})
	}

	return &dto.WhiteListListResponse{
		Items: items,
		Total: len(items),
	}, nil
}

// AddWhiteListIP 添加白名单IP
func (s *ApiApplicationServiceImpl) AddWhiteListIP(ctx context.Context, userID string, ipAddress string) error {
	apiUser, err := s.apiUserService.LoadApiUserByUserId(ctx, userID)
	if err != nil {
		return err
	}

	// 确保WhiteList不为nil
	if apiUser.WhiteList == nil {
		apiUser.WhiteList = []string{}
	}

	// 使用实体的领域方法添加IP到白名单
	err = apiUser.AddToWhiteList(ipAddress)
	if err != nil {
		return err
	}

	// 保存更新
	err = s.apiUserService.SaveApiUser(ctx, apiUser)
	if err != nil {
		return err
	}

	return nil
}

// DeleteWhiteListIP 删除白名单IP
func (s *ApiApplicationServiceImpl) DeleteWhiteListIP(ctx context.Context, userID string, ipAddress string) error {
	apiUser, err := s.apiUserService.LoadApiUserByUserId(ctx, userID)
	if err != nil {
		return err
	}

	// 确保WhiteList不为nil
	if apiUser.WhiteList == nil {
		apiUser.WhiteList = []string{}
	}

	// 使用实体的领域方法删除IP
	err = apiUser.RemoveFromWhiteList(ipAddress)
	if err != nil {
		return err
	}

	// 保存更新
	err = s.apiUserService.SaveApiUser(ctx, apiUser)
	if err != nil {
		return err
	}

	return nil
}

// GetUserApiCalls 获取用户API调用记录
func (s *ApiApplicationServiceImpl) GetUserApiCalls(ctx context.Context, userID string, filters map[string]interface{}, options interfaces.ListOptions) (*dto.ApiCallListResponse, error) {
	// 查询API调用记录（包含产品名称）
	productNameMap, calls, total, err := s.apiCallRepository.ListByUserIdWithFiltersAndProductName(ctx, userID, filters, options)
	if err != nil {
		s.logger.Error("查询API调用记录失败", zap.Error(err), zap.String("userID", userID))
		return nil, err
	}

	// 转换为响应DTO
	var items []dto.ApiCallRecordResponse
	for _, call := range calls {
		item := dto.ApiCallRecordResponse{
			ID:            call.ID,
			AccessId:      call.AccessId,
			UserId:        *call.UserId,
			TransactionId: call.TransactionId,
			ClientIp:      call.ClientIp,
			Status:        call.Status,
			StartAt:       call.StartAt.Format("2006-01-02 15:04:05"),
			CreatedAt:     call.CreatedAt.Format("2006-01-02 15:04:05"),
			UpdatedAt:     call.UpdatedAt.Format("2006-01-02 15:04:05"),
		}

		// 处理可选字段
		if call.ProductId != nil {
			item.ProductId = call.ProductId
		}
		// 从映射中获取产品名称
		if productName, exists := productNameMap[call.ID]; exists {
			item.ProductName = &productName
		}
		if call.EndAt != nil {
			endAt := call.EndAt.Format("2006-01-02 15:04:05")
			item.EndAt = &endAt
		}
		if call.Cost != nil {
			cost := call.Cost.String()
			item.Cost = &cost
		}
		if call.ErrorType != nil {
			item.ErrorType = call.ErrorType
		}
		if call.ErrorMsg != nil {
			item.ErrorMsg = call.ErrorMsg
		}

		items = append(items, item)
	}

	return &dto.ApiCallListResponse{
		Items: items,
		Total: total,
		Page:  options.Page,
		Size:  options.PageSize,
	}, nil
}