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using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using JWTAuth.API.Data;
using Microsoft.EntityFrameworkCore;

namespace JWTAuth.API.Controllers
{

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namespace JWTAuth.API.Models
{
    public class User
    {
        public int Id { get; set; }
        public string Username { get; set; }
        public byte[] PasswordHash { get; set; }
        public byte[] PasswordSalt { get; set; }
    }
}

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using JWTAuth.API.Models;
using Microsoft.EntityFrameworkCore;

namespace JWTAuth.API.Data
{
    public class DataContext : DbContext
    {
        public DataContext(DbContextOptions<DataContext> options) : base(options) {}
        public DbSet<Value> Values { get; set; }
        public DbSet<User> Users { get; set; }

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using System;
using Microsoft.EntityFrameworkCore.Metadata;
using Microsoft.EntityFrameworkCore.Migrations;

namespace JWTAuth.API.Migrations
{
    public partial class AddedUserModel : Migration
    {
        protected override void Up(MigrationBuilder migrationBuilder)
        {

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using System.Threading.Tasks;
using JWTAuth.API.Models;

namespace JWTAuth.API.Data
{
    public interface IAuthRepository
    {
         Task<User> Register(User user, string password); 
         Task<User> Login(string username, string pasword);
         Task<bool> UserExists(string username);

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using System.Threading.Tasks;

namespace JWTAuth.API.Data
{
    public class AuthRepository : IAuthRepository
    {
        public async Task<User> Login(string username, string password)
        {

        }

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        public async Task<User> Login(string username, string password)
        {
            var user = await _context.Users.FirstOrDefaultAsync(x => x.Username == username); //Get user from database.
            if(user == null)
                return null; // User does not exist.

            if(!VerifyPassword(password, user.PasswordHash,user.PasswordSalt))
                return null;
            
            return user;

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        public async Task<bool> UserExists(string username)
        {
            if (await _context.Users.AnyAsync(x => x.Username == username))
                return true;
            return false;
        }

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        // This method gets called by the runtime. Use this method to add services to the container.
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddDbContext<DataContext>(x => x.UseSqlServer(Configuration.GetConnectionString("DefaultConnection")));
            services.AddControllers()
                .AddNewtonsoftJson();
            services.AddScoped<IAuthRepository, AuthRepository>();
        }

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using Microsoft.AspNetCore.Mvc;

namespace JWTAuth.API.Controllers
{
    public class AuthController : Controller
    {
        
    }
}