namespace Parking_spaces.Services;

using Parking_spaces.Authorization;
using Parking_spaces.Entities;
using Parking_spaces.Models;

public interface IUserService
{
    AuthenticateResponse? Authenticate(AuthenticateRequest model);
    IEnumerable<User> GetAll();
    User? GetById(int id);
}

public class UserService : IUserService
{
    
    // users hardcoded for simplicity, store in a db with hashed passwords in production applications
    private List<User> _users = new List<User>
    {
        new User { Id = 1, FirstName = "Developer", LastName = "Manager", Username = "test", Password = "test" },
        new User { Id = 2, FirstName = "Developer", LastName = "Engineer", Username = "admin", Password = "admin" }
    };

    private readonly IJwtUtils _jwtUtils;

    public UserService(IJwtUtils jwtUtils)
    {
        _jwtUtils = jwtUtils;
    }

    public AuthenticateResponse? Authenticate(AuthenticateRequest model)
    {
        var user = _users.SingleOrDefault(x => x.Username == model.Username && x.Password == model.Password);

        // return null if user not found
        if (user == null) return null;

        // authentication successful so generate jwt token
        var token = _jwtUtils.GenerateJwtToken(user);

        return new AuthenticateResponse(user, token);
    }

    public IEnumerable<User> GetAll()
    {
        return _users;
    }

    public User? GetById(int id)
    {
        return _users.FirstOrDefault(x => x.Id == id);
    }
}