using SurveyBackend.Core.Models;
using SurveyBackend.Core.Services;
using SurveyBackend.Services.Helpers;

namespace SurveyBackend.Services.Services;

public class AuthorizationService
{
    private readonly IUserService _userService;
    private readonly IPasswordHasher _passwordHasher;

    public AuthorizationService(IUserService userService, IPasswordHasher passwordHasher)
    {
        _userService = userService;
        _passwordHasher = passwordHasher;
    }

    public async Task<string?> LogInUser(string email, string password)
    {
        var user = await _userService.GetUserByEmail(email);
        if (user is null || !_passwordHasher.Verify(password, user.Password))
        {
            return null;
        }

        var token = TokenHelper.GetAuthToken(user);
        return token;
    }

    public async Task RegisterUser(User user)
    {
        var existingUser = await _userService.GetUserByEmail(user.Email);
        if (existingUser is not null)
        {
            throw new Exception("Email already exists");
        }

        user.Password = _passwordHasher.HashPassword(user.Password);

        await _userService.CreateUserAsync(user);
    }
}