<?php
session_start();
$con =mysqli_connect("localhost", "root","","social");

if(mysqli_connect_errno()){
    echo "Fail to connect:" . mysqli_connect_errno();
}

//Declaring var to pervent errors

$fname =""; //First name
$lname =""; //Last name
$em = ""; //email
$em2 = ""; //email2
$password = ""; //password
$password2 = ""; //password2
$date = ""; //Sign up date
$error_array = array(); //Holds errors

if(isset($_POST['register_button'])){

    // Registration form values

    //First name
    $fname = strip_tags($_POST['reg_fname']); // Remove html tags
    $fname = str_replace(' ', '', $fname); // Remove spaces
    $fname = ucfirst(strtolower($fname)); // Uppercase first letter
    $_SESSION['reg_fname'] = $fname; //Stores firstname into session variable

    //Last name
    $lname = strip_tags($_POST['reg_lname']); // Remove html tags
    $lname = str_replace(' ', '', $lname); // Remove spaces
    $lname = ucfirst(strtolower($lname)); // Uppercase first letter
    $_SESSION['reg_lname'] = $lname; //Stores lastname into session variable

     //email
     $em = strip_tags($_POST['reg_email']); // Remove html tags
     $em = str_replace(' ', '', $em); // Remove spaces
     $em = ucfirst(strtolower($em)); // Uppercase first letter
     $_SESSION['reg_email'] = $em; //Stores email into session variable

     //email 2
     $em2 = strip_tags($_POST['reg_email2']); // Remove html tags
     $em2 = str_replace(' ', '', $em2); // Remove spaces
     $em2 = ucfirst(strtolower($em2)); // Uppercase first letter
     $_SESSION['reg_email2'] = $em2; //Stores email2 into session variable

     //Password
     $password = strip_tags($_POST['reg_password']); // Remove html tags
     //Password 2
     $password2 = strip_tags($_POST['reg_password2']); // Remove html tags

     $date = date("Y-m-d");  //Current date

    if($em == $em2) {
        //Check if email invalid format
         if(filter_var($em, FILTER_VALIDATE_EMAIL)) {
           $em = filter_var($em, FILTER_VALIDATE_EMAIL);

           //Check if email already exists
           $e_check = mysqli_query($con, "SELECT email FROM users WHERE email='$em'");

           // Count the number of rows returned
           $num_rows = mysqli_num_rows($e_check);

           if($num_rows > 0) {
               array_push($error_array, "Email already in use<br>");
           }

        } else {
            array_push($error_array, "Invalid email format<br>");
        }

    } else {
        array_push($error_array, "Emails don't match<br>");
    }

    if (strlen($fname) > 25 || strlen($fname) < 2) {
        array_push($error_array,  "Your frist name must be between 2 and 25 characters<br>");
    }

    if (strlen($lname) > 25 || strlen($lname) < 2) {
        array_push($error_array, "Your last name must be between 2 and 25 characters<br>");
    }

    if ($password !=$password2) {
        array_push($error_array, "Your passwords do not match<br>");
    } else {
       if(preg_match('/[^A-Za-z0-9]/', $password)) {
        array_push($error_array, "Your password can only contain english characters or numbers<br>");
       }
    }

    if(strlen($password) > 30 || strlen($password) < 6) {
        array_push($error_array,  "Your password must be between 6 and 30 characters<br>");
    }

    if(empty($error_array)){
        $password = md5($password); //Encrypt password before sending to database
        // Generate username by concatenating first name and last name
        $username = strtolower($fname . "_" . $lname );
        $check_username_query = mysqli_query($con, "SELECT username FORM users WHERE username='$username'");

        $i = 0;
        //If username exists add number to username
        while(mysqli_num_rows($check_username_query)!=0){
            $i++; // Add 1 to i
            $username = $username . "_" . $i;
            $check_username_query = mysqli_query($con, "SELECT username FORM users WHERE username='$username'");
        }
        //Profile picture assignment
        $rand = rand(1,2); //Random number between 1 adn 2
        $profile_pic = "assets/images/profile_pics/head_deep_blue.png";
        if($rand == 1 )
            $profile_pic = "assets/images/profile_pics/head_deep_blue.png";
        else if($rand == 2)
        $profile_pic = "assets/images/profile_pics/head_emerald.png";

        $query = mysqli_query($con, "INSERT INTO users VALUES('', '$fname', '$lname', '$em', '$password', '$date', '$profile_pic', '0', '0', 'no', ',')");
    }

}

?>


<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Welcome to Swirlfeed</title>
</head>
<body>

    <form action="register.php" method="POST">
        <input type="text" name="reg_fname" placeholder="First Name" value="<?php if(isset($_SESIION['reg_fname'])) {
           echo  $_SESIION['reg_fname'];
        } ?>" required>
        <br>
        <?php if(in_array("Your frist name must be between 2 and 25 characters<br>", $error_array)) echo "Your frist name must be betweeb 2 and 25 characters<br>"?>
        <input type="text" name="reg_lname" placeholder="Last Name" value="<?php if(isset($_SESIION['reg_lname'])) {
           echo  $_SESIION['reg_lname'];
        } ?>" required>
        <br>
        <?php if(in_array("Your last name must be between 2 and 25 characters<br>", $error_array)) echo "Your last name must be betweeb 2 and 25 characters<br>"?>
        <input type="email" name="reg_email" placeholder="Email" value="<?php if(isset($_SESIION['reg_email'])) {
           echo  $_SESIION['reg_email'];
        } ?>" required >
        <br>

        <input type="email" name="reg_email2" placeholder="Confirm email" value="<?php if(isset($_SESIION['reg_email2'])) {
           echo  $_SESIION['reg_email2'];
        } ?>" required>
        <br>
        <?php if(in_array("Email already in use<br>",$error_array))  echo "Email already in use <br>";
        else if(in_array("Invalid email format<br>",$error_array))  echo "Invalid email format<br>";
        else if(in_array("Emails don't match<br>",$error_array))  echo "Emails don't match<br>";?>
        <input type="password" name="reg_password" placeholder="password" required>
        <br>
        <input type="password" name="reg_password2" placeholder="Confirm Password" required>
        <br>
        <?php if(in_array("Your passwords do not match<br>",$error_array))  echo "Your passwords do not match<br>";
        else if(in_array("Your password can only contain english characters or numbers<br>",$error_array))  echo "Your password can only contain english characters or numbers<br>";
        else if(in_array("Your password must be between 6 and 30 characters<br>",$error_array))  echo "Your password must be between 6 and 30 characters<br>";?>
        <br>
        <input type="submit" name="register_button" value="register">
    </form>

</body>
</html>