Backend/TCM_API/Services/UserService.cs

namespace TCM_API.Services;
using Microsoft.EntityFrameworkCore;
using TCM_API.Authorization;
using TCM_API.Entities;
using TCM_API.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> user_test = new List<User>
    {
        new User { Id = 1, FirstName = "Test", LastName = "User", Username = "test", Password = "test" },
        new User { Id =  2, FirstName = "Test", LastName = "User", Username = "admin", Password = "admin" }
    };

    public DbSet<User> user_test { get; set; } = null!; 
    
   
    public List<User> GetUsers ()
    {
        return _dbContext.user_test.ToList();
    }

    */

    private readonly IJwtUtils _jwtUtils;

    public UserService(IJwtUtils jwtUtils, SqlContext dbContext)
    {
        _jwtUtils = jwtUtils;
        _dbContext = dbContext;
    }


    private readonly SqlContext _dbContext;


    public AuthenticateResponse? Authenticate(AuthenticateRequest model)
    {
        var user = _dbContext.user_table.SingleOrDefault(
            x => (x.username == model.Username || x.email == model.Username)
                  && x.password == model.Password);

        // return null if user not found
        if (user == null ) return null;
        if (!int.TryParse(user.level, out int level) || level % 2 != 0)
        {
            return null;
        }
        // authentication successful so generate jwt token
        var token = _jwtUtils.GenerateJwtToken(user);

        return new AuthenticateResponse(user, token);
    }


    public IEnumerable<User> GetAll()
    {
        return _dbContext.user_table;
    }

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


    
}