package user

import (
	"context"
	"errors"
	"fmt"
	"github.com/zeromicro/go-zero/core/logx"
	"google.golang.org/grpc/codes"
	"google.golang.org/grpc/status"
	"google.golang.org/protobuf/types/known/timestamppb"
	"mingyang-admin-app-rpc/ent/user"
	"mingyang-admin-app-rpc/internal/jwt_manager"
	"mingyang-admin-app-rpc/internal/logic/cacherepo"
	"mingyang-admin-app-rpc/internal/svc"
	"mingyang-admin-app-rpc/internal/util"
	"mingyang-admin-app-rpc/types/app"
	"strings"
	"time"
)

type RegisterUserLogic struct {
	ctx    context.Context
	svcCtx *svc.ServiceContext
	logx.Logger
	jwtManager *jwt_manager.JWTManager
	cacheRepo  *cacherepo.CacheRepository
}

func NewRegisterUserLogic(ctx context.Context, svcCtx *svc.ServiceContext) *RegisterUserLogic {
	return &RegisterUserLogic{
		ctx:        ctx,
		svcCtx:     svcCtx,
		jwtManager: jwt_manager.NewJWTManager(&svcCtx.Config.JWTConf),
		Logger:     logx.WithContext(ctx),
		cacheRepo:  cacherepo.NewCacheRepository(ctx, svcCtx),
	}
}

// RegisterUser 用户注册
func (s *RegisterUserLogic) RegisterUser(req *app.RegisterUserRequest) (*app.RegisterUserResponse, error) {
	// 1. 验证输入
	if err := s.validateRegisterRequest(req); err != nil {
		return nil, status.Errorf(codes.InvalidArgument, "validation failed: %v", err)
	}

	// 2. 验证验证码
	if err := s.verifyRegistrationCode(s.ctx, req); err != nil {
		return nil, status.Errorf(codes.InvalidArgument, "verification failed: %v", err)
	}

	// 3. 验证密码强度
	if err := util.ValidatePasswordStrength(req.GetPassword()); err != nil {
		return nil, status.Errorf(codes.InvalidArgument, "password validation failed: %v", err)
	}
	// 4. 哈希密码
	passwordHash, err := util.HashPassword(req.GetPassword())
	if err != nil {
		return nil, status.Errorf(codes.Internal, "failed to hash password: %v", err)
	}

	// 5. 标准化手机号格式
	var mobile string
	if req.GetMobile() != "" {
		normalizedPhone := util.NormalizePhone(req.GetMobile())
		mobile = normalizedPhone
	}

	// 6. 准备用户数据
	userData := CreateUserData{
		Username:           strings.ToLower(strings.TrimSpace(req.GetUsername())),
		Email:              strings.ToLower(strings.TrimSpace(req.GetEmail())),
		Mobile:             mobile,
		PasswordHash:       passwordHash,
		Gender:             user.Gender(req.GetGender()),
		Nickname:           req.GetNickName(),
		RegistrationSource: req.GetRegistrationSource(),
		Metadata: map[string]interface{}{
			"registered_via": req.RegistrationSource,
			"registered_at":  time.Now().Format(time.RFC3339),
		},
	}

	userRepo := NewUser(s.ctx, s.svcCtx)

	user, err := userRepo.CreateUser(s.ctx, &userData)

	if err != nil {
		if strings.Contains(err.Error(), "already exists") {
			return nil, status.Errorf(codes.AlreadyExists, "user already exists")
		}
		return nil, status.Errorf(codes.Internal, "failed to create user: %v", err)
	}

	// 8. 生成JWT令牌
	tokenPair, err := s.jwtManager.GenerateTokenPair(*user.Id)
	if err != nil {
		// 注意：这里不应该返回错误，因为用户已经创建成功
		// 只是记录日志，继续处理
		fmt.Printf("Failed to generate token for user %v: %v\n", user.Id, err)
	}

	// 10. 发送欢迎邮件（异步）
	go func() {
		//todo 发送欢迎邮件

	}()
	// 11. 构建响应
	response := &app.RegisterUserResponse{
		User: user,
	}
	if tokenPair != nil {
		response.AuthToken = &app.AuthToken{
			AccessToken:         tokenPair.AccessToken,
			RefreshToken:        tokenPair.RefreshToken,
			TokenType:           tokenPair.TokenType,
			AccessTokenExpires:  timeToProto(tokenPair.AccessTokenExpiresAt),
			RefreshTokenExpires: timeToProto(tokenPair.RefreshTokenExpiresAt),
		}
	}
	return response, nil
}

// validateRegisterRequest 验证注册请求
func (s *RegisterUserLogic) validateRegisterRequest(req *app.RegisterUserRequest) error {
	return nil
}

// verifyRegistrationCode 验证注册验证码
func (s *RegisterUserLogic) verifyRegistrationCode(ctx context.Context, req *app.RegisterUserRequest) error {
	var cacheKey string
	verificationType := req.GetVerificationType()

	if app.AccountType(verificationType) == app.AccountType_EMAIL {
		cacheKey = fmt.Sprintf("email_verification_code:%s", req.GetEmail())
	} else if app.AccountType(verificationType) == app.AccountType_MOBILE {
		cacheKey = fmt.Sprintf("mobile_verification_code:%s", req.GetMobile())
	} else {
		return errors.New("invalid verification type")
	}
	fmt.Printf("cacheKey: %s", cacheKey)
	// 获取验证码数据
	codeData, err := s.cacheRepo.GetVerificationCode(ctx, cacheKey)
	if err != nil {
		fmt.Printf("Failed to get verification code: %v\n", err)
		return fmt.Errorf("failed to get verification code: %w", err)
	}
	if codeData == nil {
		return errors.New("verification code expired or not found")
	}
	// 验证验证码
	if codeData.Code != req.GetCaptcha() {
		// 增加尝试次数
		if err := s.cacheRepo.IncrementVerificationAttempts(ctx, cacheKey); err != nil {
			fmt.Printf("Failed to increment verification attempts: %v\n", err)
		}
		return errors.New("invalid verification code")
	}
	/*// 验证成功，删除验证码
	if err := s.cacheRepo.DeleteVerificationCode(ctx, cacheKey); err != nil {
		fmt.Printf("Failed to delete verification code: %v\n", err)
	}*/
	return nil
}

func timeToProto(t time.Time) *timestamppb.Timestamp {
	pbTimestamp := timestamppb.New(t)
	if err := pbTimestamp.CheckValid(); err != nil {
		return nil
	}
	return pbTimestamp
}