<?php

/**
 * Displays the registration page.
 */
function auth_controller_register_get()
{
	guest_only();
	echo render('layouts/basic', ['view' => 'pages/auth/register']);
}

/**
 * Handles the registration form submission.
 */
function auth_controller_register_post()
{
	guest_only();
	csrf_ensure();

	$errors = [];

	$u = trim($_POST['u'] ?? '');
	$e = trim($_POST['e'] ?? '');
	$p = $_POST['p'] ?? '';

	/*
		A username is required.
		A username must be at least 3 characters long and at most 18 characters long.
		A username must contain only alphanumeric characters and spaces.
	*/
	if (empty($u) || strlen($u) < 3 || strlen($u) > 18 || !ctype_alnum(str_replace(' ', '', $u))) {
		$errors['u'][] = 'Username is required and must be between 3 and 18 characters long and contain only
			alphanumeric characters and spaces.';
	}

	/*
		An email is required.
		An email must be at most 255 characters long.
		An email must be a valid email address.
	*/
	if (empty($e) || strlen($e) > 255 || !filter_var($e, FILTER_VALIDATE_EMAIL)) {
		$errors['e'][] = 'Email is required must be a valid email address.';
	}

	/*
		A password is required.
		A password must be at least 6 characters long.
	*/
	if (empty($p) || strlen($p) < 6) {
		$errors['p'][] = 'Password is required and must be at least 6 characters long.';
	}

	/*
		A username must be unique.
	*/
	if (auth_username_exists($u)) {
		$errors['u'][] = 'Username is already taken.';
	}

	/*
		An email must be unique.
	*/
	if (auth_email_exists($e)) {
		$errors['e'][] = 'Email is already taken.';
	}

	// If there are errors at this point, send them to the page with errors flashed.
	if (!empty($errors)) {
		$GLOBALS['form-errors'] = $errors;
		echo page('auth/register');
		exit;
	}

	$user = user_create($u, $e, $p);
	if ($user === false) router_error(400);

	$_SESSION['user'] = user_find($u);
	wallet_create($_SESSION['user']['id']);
	redirect('/character/create-first');
}

/**
 * Displays the login page.
 */
function auth_controller_login_get()
{
	guest_only();
	echo render('layouts/basic', ['view' => 'pages/auth/login']);
}

/**
 * Handles the login form submission.
 */
function auth_controller_login_post()
{
	guest_only();
	csrf_ensure();

	$errors = [];

	$u = trim($_POST['u'] ?? '');
	$p = $_POST['p'] ?? '';

	if (empty($u)) $errors['u'][] = 'Username is required.';
	if (empty($p)) $errors['p'][] = 'Password is required.';

	// If there are errors at this point, send them to the page with errors flashed.
	if (!empty($errors)) {
		$GLOBALS['form-errors'] = $errors;
		echo render('layouts/basic', ['view' => 'pages/auth/login']);
		exit;
	}

	$user = user_find($u);
	if ($user === false || !password_verify($p, $user['password'])) {
		$errors['x'][] = 'Invalid username or password.';
		$GLOBALS['form-errors'] = $errors;
		echo render('layouts/basic', ['view' => 'pages/auth/login']);
		exit;
	}

	$_SESSION['user'] = $user;

	if ($_POST['remember'] ?? false) {
		$token = token();
		$expires = strtotime('+30 days');
		$result = db_query(db_auth(), "INSERT INTO sessions (token, user_id, expires) VALUES (:t, :u, :e)", [
			':t' => $token,
			':u' => $_SESSION['user']['id'],
			':e' => $expires
		]);
		if (!$result) router_error(400);
		set_cookie('remember_me', $token, $expires);
	}

	if (char_count($_SESSION['user']['id']) === 0) {
		redirect('/character/create-first');
	} elseif (!change_user_character($_SESSION['user']['char_id'])) {
		router_error(999);
	}

	redirect('/');
}

/**
 * Logs the user out.
 */
function auth_controller_logout_post()
{
	csrf_ensure();
	session_delete($_SESSION['user']['id']);
	unset($_SESSION['user']);
	unset($_SESSION['char']);
	set_cookie('remember_me', '', 1);
	redirect('/');
}