package service

import (
	"context"

	"github.com/aykhans/oh-my-chat/internal/core/domain"
	"github.com/aykhans/oh-my-chat/internal/core/port"
	"github.com/aykhans/oh-my-chat/internal/core/utils"
)

type AuthService struct {
	userRepository port.UserRepository
	tokenService   port.TokenService
}

// NewAuthService creates a new auth service instance
func NewAuthService(userRepository port.UserRepository, tokenService port.TokenService) *AuthService {
	return &AuthService{
		userRepository,
		tokenService,
	}
}

func (authService *AuthService) LoginByEmail(
	ctx context.Context,
	email, password string,
) (string, error) {
	user, err := authService.userRepository.GetUserByEmail(ctx, email)
	if err != nil {
		if err == domain.ErrDataNotFound {
			return "", domain.ErrInvalidEmailCredentials
		}
		return "", domain.ErrInternal
	}

	err = utils.ComparePassword(password, user.Password)
	if err != nil {
		return "", domain.ErrInvalidEmailCredentials
	}

	accessToken, err := authService.tokenService.CreateToken(user)
	if err != nil {
		return "", domain.ErrTokenCreation
	}

	return accessToken, nil
}

func (authService *AuthService) LoginByUsername(
	ctx context.Context,
	username, password string,
) (string, error) {
	user, err := authService.userRepository.GetUserByEmail(ctx, username)
	if err != nil {
		if err == domain.ErrDataNotFound {
			return "", domain.ErrInvalidUsernameCredentials
		}
		return "", domain.ErrInternal
	}

	err = utils.ComparePassword(password, user.Password)
	if err != nil {
		return "", domain.ErrInvalidUsernameCredentials
	}

	accessToken, err := authService.tokenService.CreateToken(user)
	if err != nil {
		return "", domain.ErrTokenCreation
	}

	return accessToken, nil
}