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<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.

/**
 * Utils for behat-related stuff
 *
 * @package    core
 * @category   test
 * @copyright  2012 David Monllaó
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

defined('MOODLE_INTERNAL') || die();

require_once(__DIR__ . '/../lib.php');
require_once(__DIR__ . '/../../testing/classes/util.php');
require_once(__DIR__ . '/behat_command.php');
require_once(__DIR__ . '/behat_config_manager.php');

require_once(__DIR__ . '/../../filelib.php');
require_once(__DIR__ . '/../../clilib.php');

use Behat\Mink\Session;
use Behat\Mink\Exception\ExpectationException;

/**
 * Init/reset utilities for Behat database and dataroot
 *
 * @package   core
 * @category  test
 * @copyright 2013 David Monllaó
 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class behat_util extends testing_util {

/**
     * The behat test site fullname and shortname.
     */
    const BEHATSITENAME = "Acceptance test site";

/**
     * @var array Files to skip when resetting dataroot folder
     */
    protected static $datarootskiponreset = array('.', '..', 'behat', 'behattestdir.txt');

/**
     * @var array Files to skip when dropping dataroot folder
     */
    protected static $datarootskipondrop = array('.', '..', 'lock');

/**
     * Installs a site using $CFG->dataroot and $CFG->prefix
     * @throws coding_exception
     * @return void
     */
    public static function install_site() {
        global $DB, $CFG;
        require_once($CFG->dirroot.'/user/lib.php');
        if (!defined('BEHAT_UTIL')) {
            throw new coding_exception('This method can be only used by Behat CLI tool');
        }

$tables = $DB->get_tables(false);
        if (!empty($tables)) {
            behat_error(BEHAT_EXITCODE_INSTALLED);
        }

// New dataroot.
        self::reset_dataroot();

$options = array();
        $options['adminuser'] = 'admin';
        $options['adminpass'] = 'admin';
        $options['fullname'] = self::BEHATSITENAME;
        $options['shortname'] = self::BEHATSITENAME;

install_cli_database($options, false);

// We need to keep the installed dataroot filedir files.
        // So each time we reset the dataroot before running a test, the default files are still installed.
        self::save_original_data_files();

$frontpagesummary = new admin_setting_special_frontpagedesc();
        $frontpagesummary->write_setting(self::BEHATSITENAME);

// Update admin user info.
        $user = $DB->get_record('user', array('username' => 'admin'));
        $user->email = 'moodle@example.com';
        $user->firstname = 'Admin';
        $user->lastname = 'User';
        $user->city = 'Perth';
        $user->country = 'AU';
        user_update_user($user, false);

// Disable email message processor.
        $DB->set_field('message_processors', 'enabled', '0', array('name' => 'email'));

// Sets maximum debug level.
        set_config('debug', DEBUG_DEVELOPER);
        set_config('debugdisplay', 1);

// Disable some settings that are not wanted on test sites.
        set_config('noemailever', 1);

// Enable web cron.
        set_config('cronclionly', 0);

// Set editor autosave to high value, so as to avoid unwanted ajax.
        set_config('autosavefrequency', '604800', 'editor_atto');

// Set noreplyaddress to an example domain, as it should be valid email address and test site can be a localhost.
        set_config('noreplyaddress', 'noreply@example.com');

// Keeps the current version of database and dataroot.
        self::store_versions_hash();

// Stores the database contents for fast reset.
        self::store_database_state();
    }

/**
     * Drops dataroot and remove test database tables
     * @throws coding_exception
     * @return void
     */
    public static function drop_site() {

if (!defined('BEHAT_UTIL')) {
            throw new coding_exception('This method can be only used by Behat CLI tool');
        }

self::reset_dataroot();
        self::drop_database(true);
        self::drop_dataroot();
    }

/**
     * Delete files and directories under dataroot.
     */
    public static function drop_dataroot() {
        global $CFG;

// As behat directory is now created under default $CFG->behat_dataroot_parent, so remove the whole dir.
        if ($CFG->behat_dataroot !== $CFG->behat_dataroot_parent) {
            remove_dir($CFG->behat_dataroot, false);
        } else {
            // It should never come here.
            throw new moodle_exception("Behat dataroot should not be same as parent behat data root.");
        }
    }

/**
     * Checks if $CFG->behat_wwwroot is available and using same versions for cli and web.
     *
     * @return void
     */
    public static function check_server_status() {
        global $CFG;

$url = $CFG->behat_wwwroot . '/admin/tool/behat/tests/behat/fixtures/environment.php';

// Get web versions used by behat site.
        $ch = curl_init($url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        $result = curl_exec($ch);
        $statuscode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        curl_close($ch);

if ($statuscode !== 200 || empty($result) || (!$result = json_decode($result, true))) {

behat_error (BEHAT_EXITCODE_REQUIREMENT, $CFG->behat_wwwroot . ' is not available, ensure you specified ' .
                'correct url and that the server is set up and started.' . PHP_EOL . ' More info in ' .
                behat_command::DOCS_URL . PHP_EOL);
        }

// Check if cli version is same as web version.
        $clienv = self::get_environment();
        if ($result != $clienv) {
            $output = 'Differences detected between cli and webserver...'.PHP_EOL;
            foreach ($result as $key => $version) {
                if ($clienv[$key] != $version) {
                    $output .= ' ' . $key . ': ' . PHP_EOL;
                    $output .= ' - web server: ' . $version . PHP_EOL;
                    $output .= ' - cli: ' . $clienv[$key] . PHP_EOL;
                }
            }
            echo $output;
            ob_flush();
        }
    }

/**
     * Checks whether the test database and dataroot is ready
     * Stops execution if something went wrong
     * @throws coding_exception
     * @return void
     */
    protected static function test_environment_problem() {
        global $CFG, $DB;

if (!defined('BEHAT_UTIL')) {
            throw new coding_exception('This method can be only used by Behat CLI tool');
        }

if (!self::is_test_site()) {
            behat_error(1, 'This is not a behat test site!');
        }

$tables = $DB->get_tables(false);
        if (empty($tables)) {
            behat_error(BEHAT_EXITCODE_INSTALL, '');
        }

if (!self::is_test_data_updated()) {
            behat_error(BEHAT_EXITCODE_REINSTALL, 'The test environment was initialised for a different version');
        }
    }

/**
     * Enables test mode
     *
     * It uses CFG->behat_dataroot
     *
     * Starts the test mode checking the composer installation and
     * the test environment and updating the available
     * features and steps definitions.
     *
     * Stores a file in dataroot/behat to allow Moodle to switch
     * to the test environment when using cli-server.
     * @param bool $themesuitewithallfeatures List themes to include core features.
     * @param string $tags comma separated tag, which will be given preference while distributing features in parallel run.
     * @param int $parallelruns number of parallel runs.
     * @param int $run current run.
     * @throws coding_exception
     * @return void
     */
    public static function start_test_mode($themesuitewithallfeatures = false, $tags = '', $parallelruns = 0, $run = 0) {
        global $CFG;

if (!defined('BEHAT_UTIL')) {
            throw new coding_exception('This method can be only used by Behat CLI tool');
        }

// Checks the behat set up and the PHP version.
        if ($errorcode = behat_command::behat_setup_problem()) {
            exit($errorcode);
        }

// Check that test environment is correctly set up.
        self::test_environment_problem();

// Updates all the Moodle features and steps definitions.
        behat_config_manager::update_config_file('', true, $tags, $themesuitewithallfeatures, $parallelruns, $run);

if (self::is_test_mode_enabled()) {
            return;
        }

$contents = '$CFG->behat_wwwroot, $CFG->behat_prefix and $CFG->behat_dataroot' .
            ' are currently used as $CFG->wwwroot, $CFG->prefix and $CFG->dataroot';
        $filepath = self::get_test_file_path();
        if (!file_put_contents($filepath, $contents)) {
            behat_error(BEHAT_EXITCODE_PERMISSIONS, 'File ' . $filepath . ' can not be created');
        }
    }

/**
     * Returns the status of the behat test environment
     *
     * @return int Error code
     */
    public static function get_behat_status() {

if (!defined('BEHAT_UTIL')) {
            throw new coding_exception('This method can be only used by Behat CLI tool');
        }

// Checks the behat set up and the PHP version, returning an error code if something went wrong.
        if ($errorcode = behat_command::behat_setup_problem()) {
            return $errorcode;
        }

// Check that test environment is correctly set up, stops execution.
        self::test_environment_problem();
    }

/**
     * Disables test mode
     * @throws coding_exception
     * @return void
     */
    public static function stop_test_mode() {

if (!defined('BEHAT_UTIL')) {
            throw new coding_exception('This method can be only used by Behat CLI tool');
        }

$testenvfile = self::get_test_file_path();
        behat_config_manager::set_behat_run_config_value('behatsiteenabled', 0);

if (!self::is_test_mode_enabled()) {
            echo "Test environment was already disabled\n";
        } else {
            if (!unlink($testenvfile)) {
                behat_error(BEHAT_EXITCODE_PERMISSIONS, 'Can not delete test environment file');
            }
        }
    }

/**
     * Checks whether test environment is enabled or disabled
     *
     * To check is the current script is running in the test
     * environment
     *
     * @return bool
     */
    public static function is_test_mode_enabled() {

$testenvfile = self::get_test_file_path();
        if (file_exists($testenvfile)) {
            return true;
        }

return false;
    }

/**
     * Returns the path to the file which specifies if test environment is enabled
     * @return string
     */
    public final static function get_test_file_path() {
        return behat_command::get_parent_behat_dir() . '/test_environment_enabled.txt';
    }

/**
     * Removes config settings that were added to the main $CFG config within the Behat CLI
     * run.
     *
     * Database storage is already handled by reset_database and existing config values will
     * be reset automatically by initialise_cfg(), so we only need to remove added ones.
     */
    public static function remove_added_config() {
        global $CFG;
        if (!empty($CFG->behat_cli_added_config)) {
            foreach ($CFG->behat_cli_added_config as $key => $value) {
                unset($CFG->{$key});
            }
            unset($CFG->behat_cli_added_config);
        }
    }

/**
     * Reset contents of all database tables to initial values, reset caches, etc.
     */
    public static function reset_all_data() {
        // Reset database.
        self::reset_database();

// Purge dataroot directory.
        self::reset_dataroot();

// Reset all static caches.
        accesslib_clear_all_caches(true);
        accesslib_reset_role_cache();
        // Reset the nasty strings list used during the last test.
        nasty_strings::reset_used_strings();

filter_manager::reset_caches();

// Reset course and module caches.
        if (class_exists('format_base')) {
            // If file containing class is not loaded, there is no cache there anyway.
            format_base::reset_course_cache(0);
        }
        get_fast_modinfo(0, 0, true);

// Inform data generator.
        self::get_data_generator()->reset();

// Initialise $CFG with default values. This is needed for behat cli process, so we don't have modified
        // $CFG values from the old run. @see set_config.
        self::remove_added_config();
        initialise_cfg();
    }

/**
     * Pause execution immediately.
     *
     * @param Session $session
     * @param string $message The message to show when pausing.
     * This will be passed through cli_ansi_format so appropriate ANSI formatting and features are available.
     */
    public static function pause(Session $session, string $message): void {
        $posixexists = function_exists('posix_isatty');

// Make sure this step is only used with interactive terminal (if detected).
        if ($posixexists && !@posix_isatty(STDOUT)) {
            throw new ExpectationException('Break point should only be used with interactive terminal.', $session);
        }

// Save the cursor position, ring the bell, and add a new line.
        fwrite(STDOUT, cli_ansi_format("<cursor:save><bell><newline>"));

// Output the formatted message and reset colour back to normal.
        $formattedmessage = cli_ansi_format("{$message}<colour:normal>");
        fwrite(STDOUT, $formattedmessage);

// Wait for input.
        fread(STDIN, 1024);

// Move the cursor back up to the previous position, then restore the original position stored earlier, and move
        // it back down again.
        fwrite(STDOUT, cli_ansi_format("<cursor:up><cursor:up><cursor:restore><cursor:down><cursor:down>"));

// Add any extra lines back if the provided message was spread over multiple lines.
        $linecount = count(explode("\n", $formattedmessage));
        fwrite(STDOUT, str_repeat(cli_ansi_format("<cursor:down>"), $linecount - 1));
    }
}