using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.IO;

namespace LoginTest {
    public partial class Form1 : Form {
        String username = "";
        String password = "";
        int counter = 0;
        string line;
        public Form1() {
            InitializeComponent();
        }
        private void ExitButton_Click(object sender, EventArgs e) {
            this.Close();

        }

        private void loginButton_Click(object sender, EventArgs e) {


            // Read the file and display it line by line.
            System.IO.StreamReader file = new System.IO.StreamReader(@"C:\Users\Asif\Documents\Visual Studio 2015\Projects\LoginTest\file.txt");
            while ((line = file.ReadLine()) != null) {
                if (counter == 0) username = line;
                if (counter == 1) password = line;
                counter++;
            }


            //Check if user made an account
            if (username.Length == 0 || password.Length == 0) {
                MessageBox.Show("Please enter your username and password to continue! ");
                return;
            }

            //Check username and password
            if (username == UsernameTextBox.Text && password == PasswordTextBox.Text) {
                MessageBox.Show("You have successfully logged in!");
            }
            else {
                MessageBox.Show("Incorrect username or password");
            }
        }

        private void RegisterButton_Click(object sender, EventArgs e) {

            string[] userInfo = { UsernameTextBox.Text, PasswordTextBox.Text };
            if (UsernameTextBox.TextLength == 0 || PasswordTextBox.TextLength == 0) {
                MessageBox.Show("Please enter a desired username and password in order to continue.");
                return;
            }
            /*
            username = UsernameTextBox.Text;
            password = PasswordTextBox.Text;
            */
            System.IO.File.WriteAllLines(@"C:\Users\Asif\Documents\Visual Studio 2015\Projects\LoginTest\file.txt", userInfo);

            UsernameTextBox.Text = "";
            PasswordTextBox.Text = "";
            loginButton.Enabled = true;

            MessageBox.Show("Account has been created! Log in again to continue!");
        }

        private void Form1_Load(object sender, EventArgs e) {
            if (File.Exists(@"C:\Users\Asif\Documents\Visual Studio 2015\Projects\LoginTest\file.txt")) {
                if (new FileInfo(@"C:\Users\Asif\Documents\Visual Studio 2015\Projects\LoginTest\file.txt").Length != 0) {
                    loginButton.Enabled = true;
                }
            }
        }
    }
}