WordPress additonal check while login - wordpress

Question

When a user register in my site I have set the user_activation_key column value from wp_users table like that:
$code = sha1( $user_id . time() );
global $wpdb;
$wpdb->update(
$wpdb->prefix.'users', //table name
array( 'user_activation_key' => $code ),
array( 'ID' => $user_id ),
array( '%s' ),
array( '%d' )
);
It's because I want to make activation system by sending an email with clickable link:
$activation_link = add_query_arg(
array(
'key' => $code,
'user' => $user_id
), get_permalink( 44 )
);
$message = "<div style='padding : 20px; border : 1px solid #ddd; color : #000;'>Hello $surname, <br/><br/>Please confirm your email addresss . Click this link to confirm : <a href='$activation_link'>Confirm Now</a><br/><br/></div>";
$to = $email;
$subject = 'Confirm your registration process"';
$body = $message;
$headers = array('Content-Type: text/html; charset=UTF-8');
wp_mail( $to, $subject, $body, $headers );
Now, the column user_activation_key has the hash code and user_status column value is 0
Now the actual question:
When user go to www.site.com/wp-admin that means login page I want to show an error message if the user_status column value is 0.
I don't' have any idea which hook or how can I cehck this while user login?

Answer 1

Use the admin_notices hook to display messages in the backend, the code below is similar to what your after:
add_action('admin_notices', 'account_activation_check');
function account_activation_check() {
global $wpdb;
// setup vars //
$currentID = get_current_user_id();
$user = get_user_by( 'ID', $currentID );
$userStatus = $user->user_status;
// check if user status is 0 //
if($userStatus == 0) {
echo '<div class="error"><p>Your email has not been verified!</p></div>';
}
}

Answer 2

I have solved the issues by using the wp_authenticate_user hook. Here is the code:
add_filter( 'wp_authenticate_user', 'shibbir_authenticate_user', 10, 2 );
function shibbir_authenticate_user( $user ) {
if ( $user->data->user_status == 0 ) {
return new WP_Error( 'error', __( 'Your account is not activate, Please contact site admininstrator.' , 'shibbir' ) );
}
return $user;
}