<?php
ob_start();

session_start();

// initializing variables
$username = "";
$password = "";
$email    = "";

//errors variable
$errors = array();

// connect to the database
$db = mysqli_connect('localhost', 'root', '', 'registration');
if(!$db) {
    die("Connection failed: ".mysqli_connect_error());
}


// REGISTER USER
if (isset($_POST['reg_user'])) {
  // receive all input values from the form
  $username = mysqli_real_escape_string($db, $_POST['username']);
  $email = mysqli_real_escape_string($db, $_POST['email']);
  $password_1 = mysqli_real_escape_string($db, $_POST['password_1']);
  $password_2 = mysqli_real_escape_string($db, $_POST['password_2']);

  // form validation: ensure that the form is correctly filled ...
  // by adding (array_push()) corresponding error unto $errors array
  if (empty($username)) { array_push($errors, "Username is required"); }
  if (empty($email)) { array_push($errors, "Email is required"); }
  if (empty($password_1)) { array_push($errors, "Password is required"); }
  if ($password_1 != $password_2) {
	array_push($errors, "The two passwords do not match");
  }

  // first check the database to make sure
  // a user does not already exist with the same username and/or email
  $user_check_query = "SELECT * FROM users WHERE username='$username' OR email='$email' LIMIT 1";
  $result = mysqli_query($db, $user_check_query);
  $user = mysqli_fetch_assoc($result);

  if ($user) { // if user exists
    if ($user['username'] === $username) {
      array_push($errors, "Username already exists");
    }

    if ($user['email'] === $email) {
      array_push($errors, "Email already exists");
    }
  }

  // Finally, register user if there are no errors in the form
  if (count($errors) == 0) {
  	$password = md5($password_1);//encrypt the password before saving in the database

  	$query = "INSERT INTO users (username, email, password)
  			  VALUES('$username', '$email', '$password')";
  	mysqli_query($db, $query);
  	$_SESSION['username'] = $username;
  	$_SESSION['success'] = "You are now logged in";
  	header('location: MainPage.php');
  }
}

if(isset($_POST['reg_exit']))
    {
        //exit for main page
	    header('location: MainPage.php');
    }

// ...
// ...

// LOGIN USER
if (isset($_POST['login_user'])) {
  $username = mysqli_real_escape_string($db, $_POST['username']);
  $password = mysqli_real_escape_string($db, $_POST['password']);

  if (empty($username)) {
      array_push($errors, "Username is required");
  }
  if (empty($password)) {
      array_push($errors, "Password is required");
  }

  if (count($errors) == 0) {
      $password = md5($password);
      $query = "SELECT * FROM users WHERE username='$username' AND password='$password'";
      $results = mysqli_query($db, $query);
      if (mysqli_num_rows($results) == 1) {
        $_SESSION['username'] = $username;
        $_SESSION['success'] = "You are now logged in";
        header('location: MainPage.php');
      }else {
          array_push($errors, "Wrong username/password combination");
      }
  }
}

  // ----- exit

  if(isset($_POST['exit_user']))
    {
        //exit for main page
	    header('location: MainPage.php');
    }

  // --- Comment Section

    function setComments($db) {
      if(isset($_POST['commentSubmit'])) {
        $uid =  $_POST['uid'];
        $date =  $_POST['date'];
        $message =  $_POST['message'];

        $sql = "INSERT INTO comments (uid,date,message) VALUES ('$uid','$date','$message')";
        $result=mysqli_query($db,$sql);

      }
  }

  function getComments($db) {
      $sql = "SELECT * FROM comments";
      $result = mysqli_query($db,$sql);
      while ($row = $result->fetch_assoc()) {
          echo "<div class='comment-box'><p>";
              echo $row['uid']."<br>";
              echo $row['date']."<br>";
              echo $row['message'];
          echo "</p>
          <form class='delete-form' method='POST' action='".deleteComments($db)."'>
          <input type='hidden' name='cid' value='".$row['cid']."'>
          <button type='submit' name='commentDelete'>Delete</button>
          </form>

          <form class='edit-form' method='POST' action='editcomment.php'>
            <input type='hidden' name='cid' value='".$row['cid']."'>
            <input type='hidden' name='uid' value='".$row['uid']."'>
            <input type='hidden' name='date' value='".$row['date']."'>
            <input type='hidden' name='message' value='".$row['message']."'>
            <button>Edit</button>
            </form>
            </div>";
      }

  }

  function editComments($db) {
    if(isset($_POST['commentSubmit'])) {
      $cid = $_POST['cid'];
      $uid =  $_POST['uid'];
      $date =  $_POST['date'];
      $message =  $_POST['message'];

      $sql = "UPDATE comments SET message='$message' WHERE cid='$cid'";
      $result=mysqli_query($db,$sql);
      header("Location: single.php");

    }
}

function deleteComments($db) {
  if(isset($_POST['commentDelete'])) {
    $cid = $_POST['cid'];

    $sql = "DELETE FROM comments WHERE cid='$cid'";
    $result=mysqli_query($db,$sql);
    header("Location: single.php");

  }

}






  ?>