using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Data.SqlClient;
using System.Text;
using System.Security.Cryptography;
using RCKlubben.Models;

namespace RCKlubben.Factories
{
    public class UserFactory : AutoFac<User>
    {
        public static string HashPassword(string password)
        {
            // Get byte values for each character in password and store in byte array.
            byte[] passwordBytes = Encoding.UTF8.GetBytes(password);

            // Hash the bytes
            SHA256 sha = new SHA256Managed();
            var computedPassword = sha.ComputeHash(passwordBytes);

            // Format the hashed bytes back to a string.
            var hashedPassword = string.Empty;
            foreach (var b in computedPassword)
            {
                hashedPassword += String.Format("{0:x2}", b);
            }

            return hashedPassword;
        }

        public User Login(string username, string password)
        {
            Mapper<User> mapper = new Mapper<User>();

            using (var cmd = new SqlCommand("SELECT * FROM [user] WHERE Username=@Username AND Password=@Password",
                Conn.CreateConnection()))
            {
                cmd.Parameters.AddWithValue("@Username", username);
                cmd.Parameters.AddWithValue("@Password", HashPassword(password));

                var r = cmd.ExecuteReader();
                User user = new User();

                if (r.Read())
                {
                    user = mapper.Map(r);
                }

                r.Close();
                cmd.Connection.Close();

                if (user.Id > 0)
                {
                    // Set the users session so he/she is logged in.
                    HttpContext.Current.Session["UserId"] = user.Id;
                }

                return user;
            }
        }

        public User Login(User user)
        {
            return Login(user.Username, user.Password);
        }

        public User Register(string username, string password)
        {
            // Create the new user model.
            User user = new User
            {
                Username = username,
                Password = HashPassword(password),
            };

            var id = Insert(user);

            return Get(id);
        }

        public User Register(User user)
        {
            return Register(user.Username, user.Password);
        }
    }
}