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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/>.

/**
 * Navigation steps definitions.
 *
 * @package    core
 * @category   test
 * @copyright  2012 David Monllaó
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

// NOTE: no MOODLE_INTERNAL test here, this file may be required by behat before including /config.php.

require_once(__DIR__ . '/../../behat/behat_base.php');

use Behat\Mink\Exception\ExpectationException as ExpectationException;
use Behat\Mink\Exception\DriverException as DriverException;
use Behat\Mink\Exception\ElementNotFoundException as ElementNotFoundException;

/**
 * Steps definitions to navigate through the navigation tree nodes.
 *
 * @package    core
 * @category   test
 * @copyright  2012 David Monllaó
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class behat_navigation extends behat_base {

/**
     * Helper function to get a navigation nodes text element given its text from within the navigation block.
     *
     * This function finds the node with the given text from within the navigation block.
     * It checks to make sure the node is visible, and then returns it.
     *
     * @param string $text
     * @param bool $branch Set this true if you're only interested in the node if its a branch.
     * @param null|bool $collapsed Set this to true or false if you want the node to either be collapsed or not.
     *    If its left as null then we don't worry about it.
     * @param null|string|Exception|false $exception The exception to throw if the node is not found.
     * @return \Behat\Mink\Element\NodeElement
     */
    protected function get_node_text_node($text, $branch = false, $collapsed = null, $exception = null) {
        if ($exception === null) {
            $exception = new ExpectationException('The "' . $text . '" node could not be found', $this->getSession());
        } else if (is_string($exception)) {
            $exception = new ExpectationException($exception, $this->getSession());
        }

$nodetextliteral = behat_context_helper::escape($text);
        $hasblocktree = "[contains(concat(' ', normalize-space(@class), ' '), ' block_tree ')]";
        $hasbranch = "[contains(concat(' ', normalize-space(@class), ' '), ' branch ')]";
        $hascollapsed = "p[@aria-expanded='false']";
        $notcollapsed = "p[@aria-expanded='true']";
        $match = "[normalize-space(.)={$nodetextliteral}]";

// Avoid problems with quotes.
        $isbranch = ($branch) ? $hasbranch : '';
        if ($collapsed === true) {
            $iscollapsed = $hascollapsed;
        } else if ($collapsed === false) {
            $iscollapsed = $notcollapsed;
        } else {
            $iscollapsed = 'p';
        }

// First check root nodes, it can be a span or link.
        $xpath  = "//ul{$hasblocktree}/li/{$hascollapsed}{$isbranch}/span{$match}|";
        $xpath  .= "//ul{$hasblocktree}/li/{$hascollapsed}{$isbranch}/a{$match}|";

// Next search for the node containing the text within a link.
        $xpath .= "//ul{$hasblocktree}//ul/li/{$iscollapsed}{$isbranch}/a{$match}|";

// Finally search for the node containing the text within a span.
        $xpath .= "//ul{$hasblocktree}//ul/li/{$iscollapsed}{$isbranch}/span{$match}";

$node = $this->find('xpath', $xpath, $exception);
        $this->ensure_node_is_visible($node);
        return $node;
    }

/**
     * Returns true if the navigation node with the given text is expandable.
     *
     * @Given /^navigation node "([^"]*)" should be expandable$/
     *
     * @throws ExpectationException
     * @param string $nodetext
     * @return bool
     */
    public function navigation_node_should_be_expandable($nodetext) {
        if (!$this->running_javascript()) {
            // Nodes are only expandable when JavaScript is enabled.
            return false;
        }

$node = $this->get_node_text_node($nodetext, true);
        $node = $node->getParent();
        if ($node->hasClass('emptybranch')) {
            throw new ExpectationException('The "' . $nodetext . '" node is not expandable', $this->getSession());
        }

return true;
    }

/**
     * Returns true if the navigation node with the given text is not expandable.
     *
     * @Given /^navigation node "([^"]*)" should not be expandable$/
     *
     * @throws ExpectationException
     * @param string $nodetext
     * @return bool
     */
    public function navigation_node_should_not_be_expandable($nodetext) {
        if (!$this->running_javascript()) {
            // Nodes are only expandable when JavaScript is enabled.
            return false;
        }

$node = $this->get_node_text_node($nodetext);
        $node = $node->getParent();

if ($node->hasClass('emptybranch') || $node->hasClass('tree_item')) {
            return true;
        }
        throw new ExpectationException('The "' . $nodetext . '" node is expandable', $this->getSession());
    }

/**
     * Click on an entry in the user menu.
     * @Given /^I follow "(?P<nodetext_string>(?:[^"]|\\")*)" in the user menu$/
     *
     * @param string $nodetext
     */
    public function i_follow_in_the_user_menu($nodetext) {

if ($this->running_javascript()) {
            // The user menu must be expanded when JS is enabled.
            $xpath = "//div[contains(concat(' ', @class, ' '),  ' usermenu ')]//a[contains(concat(' ', @class, ' '), ' dropdown-toggle ')]";
            $this->execute("behat_general::i_click_on", array($this->escape($xpath), "xpath_element"));
        }

// Now select the link.
        // The CSS path is always present, with or without JS.
        $csspath = ".usermenu .dropdown-menu";

$this->execute('behat_general::i_click_on_in_the',
                array($nodetext, "link", $csspath, "css_element")
        );
    }

/**
     * Expands the selected node of the navigation tree that matches the text.
     * @Given /^I expand "(?P<nodetext_string>(?:[^"]|\\")*)" node$/
     *
     * @throws ExpectationException
     * @param string $nodetext
     * @return bool|void
     */
    public function i_expand_node($nodetext) {

// This step is useless with Javascript disabled as Moodle auto expands
        // all of tree's nodes; adding this because of scenarios that shares the
        // same steps with and without Javascript enabled.
        if (!$this->running_javascript()) {
            if ($nodetext === get_string('administrationsite')) {
                // Administration menu is not loaded by default any more. Click the link to expand.
                $this->execute('behat_general::i_click_on_in_the',
                    array($nodetext, "link", get_string('administration'), "block")
                );
                return true;
            }
            return true;
        }

$node = $this->get_node_text_node($nodetext, true, true, 'The "' . $nodetext . '" node can not be expanded');
        // Check if the node is a link AND a branch.
        if (strtolower($node->getTagName()) === 'a') {
            // We just want to expand the node, we don't want to follow it.
            $node = $node->getParent();
        }
        $node->click();
    }

/**
     * Collapses the selected node of the navigation tree that matches the text.
     *
     * @Given /^I collapse "(?P<nodetext_string>(?:[^"]|\\")*)" node$/
     * @throws ExpectationException
     * @param string $nodetext
     * @return bool|void
     */
    public function i_collapse_node($nodetext) {

// No collapsible nodes with non-JS browsers.
        if (!$this->running_javascript()) {
            return true;
        }

$node = $this->get_node_text_node($nodetext, true, false, 'The "' . $nodetext . '" node can not be collapsed');
        // Check if the node is a link AND a branch.
        if (strtolower($node->getTagName()) === 'a') {
            // We just want to expand the node, we don't want to follow it.
            $node = $node->getParent();
        }
        $node->click();
    }

/**
     * Finds a node in the Navigation or Administration tree
     *
     * @param string $nodetext
     * @param array $parentnodes
     * @param string $nodetype node type (link or text)
     * @return NodeElement|null
     * @throws ExpectationException when one of the parent nodes is not found
     */
    protected function find_node_in_navigation($nodetext, $parentnodes, $nodetype = 'link') {
        // Site admin is different and needs special treatment.
        $siteadminstr = get_string('administrationsite');

// Create array of all parentnodes.
        $countparentnode = count($parentnodes);

// If JS is disabled and Site administration is not expanded we
        // should follow it, so all the lower-level nodes are available.
        if (!$this->running_javascript()) {
            if ($parentnodes[0] === $siteadminstr) {
                // We don't know if there if Site admin is already expanded so
                // don't wait, it is non-JS and we already waited for the DOM.
                $siteadminlink = $this->getSession()->getPage()->find('named_exact', array('link', "'" . $siteadminstr . "'"));
                if ($siteadminlink) {
                    $siteadminlink->click();
                }
            }
        }

// Get top level node.
        $node = $this->get_top_navigation_node($parentnodes[0]);

// Expand all nodes.
        for ($i = 0; $i < $countparentnode; $i++) {
            if ($i > 0) {
                // Sub nodes within top level node.
                $node = $this->get_navigation_node($parentnodes[$i], $node);
            }

// The p node contains the aria jazz.
            $pnodexpath = "/p[contains(concat(' ', normalize-space(@class), ' '), ' tree_item ')]";
            $pnode = $node->find('xpath', $pnodexpath);

// Keep expanding all sub-parents if js enabled.
            if ($pnode && $this->running_javascript() && $pnode->hasAttribute('aria-expanded') &&
                ($pnode->getAttribute('aria-expanded') == "false")) {

$this->js_trigger_click($pnode);

// Wait for node to load, if not loaded before.
                if ($pnode->hasAttribute('data-loaded') && $pnode->getAttribute('data-loaded') == "false") {
                    $jscondition = '(document.evaluate("' . $pnode->getXpath() . '", document, null, '.
                        'XPathResult.ANY_TYPE, null).iterateNext().getAttribute(\'data-loaded\') == "true")';

$this->getSession()->wait(behat_base::get_extended_timeout() * 1000, $jscondition);
                }
            }
        }

// Finally, click on requested node under navigation.
        $nodetextliteral = behat_context_helper::escape($nodetext);
        $tagname = ($nodetype === 'link') ? 'a' : 'span';
        $xpath = "/ul/li/p[contains(concat(' ', normalize-space(@class), ' '), ' tree_item ')]" .
            "/{$tagname}[normalize-space(.)=" . $nodetextliteral . "]";
        return $node->find('xpath', $xpath);
    }

/**
     * Finds a node in the Navigation or Administration tree and clicks on it.
     *
     * @param string $nodetext
     * @param array $parentnodes
     * @throws ExpectationException
     */
    protected function select_node_in_navigation($nodetext, $parentnodes) {
        $nodetoclick = $this->find_node_in_navigation($nodetext, $parentnodes);
        // Throw exception if no node found.
        if (!$nodetoclick) {
            throw new ExpectationException('Navigation node "' . $nodetext . '" not found under "' .
                implode($parentnodes, ' > ') . '"', $this->getSession());
        }
        $nodetoclick->click();
    }

/**
     * Helper function to get top navigation node in tree.
     *
     * @throws ExpectationException if note not found.
     * @param string $nodetext name of top navigation node in tree.
     * @return NodeElement
     */
    protected function get_top_navigation_node($nodetext) {

// Avoid problems with quotes.
        $nodetextliteral = behat_context_helper::escape($nodetext);
        $exception = new ExpectationException('Top navigation node "' . $nodetext . ' not found in "', $this->getSession());

// First find in navigation block.
        $xpath = "//div[contains(concat(' ', normalize-space(@class), ' '), ' card-text ')]" .
                "/ul[contains(concat(' ', normalize-space(@class), ' '), ' block_tree ')]" .
                "/li[contains(concat(' ', normalize-space(@class), ' '), ' contains_branch ')]" .
                "/ul/li[contains(concat(' ', normalize-space(@class), ' '), ' contains_branch ')]" .
                "[p[contains(concat(' ', normalize-space(@class), ' '), ' branch ')]" .
                "/*[contains(normalize-space(.), " . $nodetextliteral .")]]" .
                "|" .
                "//div[contains(concat(' ', normalize-space(@class), ' '), ' card-text ')]/div" .
                "/ul[contains(concat(' ', normalize-space(@class), ' '), ' block_tree ')]" .
                "/li[p[contains(concat(' ', normalize-space(@class), ' '), ' branch ')]" .
                "/*[contains(normalize-space(.), " . $nodetextliteral .")]]";

$node = $this->find('xpath', $xpath, $exception);

return $node;
    }

/**
     * Helper function to get sub-navigation node.
     *
     * @throws ExpectationException if note not found.
     * @param string $nodetext node to find.
     * @param NodeElement $parentnode parent navigation node.
     * @return NodeElement.
     */
    protected function get_navigation_node($nodetext, $parentnode = null) {

// Avoid problems with quotes.
        $nodetextliteral = behat_context_helper::escape($nodetext);

$xpath = "/ul/li[contains(concat(' ', normalize-space(@class), ' '), ' contains_branch ')]" .
            "[child::p[contains(concat(' ', normalize-space(@class), ' '), ' branch ')]" .
            "/child::span[normalize-space(.)=" . $nodetextliteral ."]]";
        $node = $parentnode->find('xpath', $xpath);
        if (!$node) {
            $xpath = "/ul/li[contains(concat(' ', normalize-space(@class), ' '), ' contains_branch ')]" .
                "[child::p[contains(concat(' ', normalize-space(@class), ' '), ' branch ')]" .
                "/child::a[normalize-space(.)=" . $nodetextliteral ."]]";
            $node = $parentnode->find('xpath', $xpath);
        }

if (!$node) {
            throw new ExpectationException('Sub-navigation node "' . $nodetext . '" not found under "' .
                $parentnode->getText() . '"', $this->getSession());
        }
        return $node;
    }

/**
     * Step to open the navigation bar if it is needed.
     *
     * The top log in and log out links are hidden when middle or small
     * size windows (or devices) are used. This step returns a step definition
     * clicking to expand the navbar if it is hidden.
     *
     * @Given /^I expand navigation bar$/
     */
    public function get_expand_navbar_step() {

// Checking if we need to click the navbar button to show the navigation menu, it
        // is hidden by default when using clean theme and a medium or small screen size.

// The DOM and the JS should be all ready and loaded. Running without spinning
        // as this is a widely used step and we can not spend time here trying to see
        // a DOM node that is not always there (at the moment clean is not even the
        // default theme...).
        $navbuttonjs = "return (
            Y.one('.btn-navbar') &&
            Y.one('.btn-navbar').getComputedStyle('display') !== 'none'
        )";

// Adding an extra click we need to show the 'Log in' link.
        if (!$this->getSession()->getDriver()->evaluateScript($navbuttonjs)) {
            return false;
        }

$this->execute('behat_general::i_click_on', array(".btn-navbar", "css_element"));
    }

/**
     * Go to current page setting item
     *
     * This can be used on front page, course, category or modules pages.
     *
     * @Given /^I navigate to "(?P<nodetext_string>(?:[^"]|\\")*)" in current page administration$/
     *
     * @throws ExpectationException
     * @param string $nodetext navigation node to click, may contain path, for example "Reports > Overview"
     * @return void
     */
    public function i_navigate_to_in_current_page_administration($nodetext) {
        $nodelist = array_map('trim', explode('>', $nodetext));
        $this->select_from_administration_menu($nodelist);
    }

/**
     * Checks that current page administration contains text
     *
     * @Given /^"(?P<element_string>(?:[^"]|\\")*)" "(?P<selector_string>[^"]*)" should exist in current page administration$/
     *
     * @throws ExpectationException
     * @param string $element The locator of the specified selector.
     *     This may be a path, for example "Subscription mode > Forced subscription"
     * @param string $selectortype The selector type (link or text)
     * @return void
     */
    public function should_exist_in_current_page_administration($element, $selectortype) {
        $nodes = array_map('trim', explode('>', $element));
        $nodetext = end($nodes);

// Find administration menu.
        $menuxpath = $this->find_header_administration_menu() ?: $this->find_page_administration_menu(true);

$this->toggle_page_administration_menu($menuxpath);
        $this->execute('behat_general::should_exist_in_the', [$nodetext, $selectortype, $menuxpath, 'xpath_element']);
        $this->toggle_page_administration_menu($menuxpath);
    }

/**
     * Checks that current page administration contains text
     *
     * @Given /^"(?P<element_string>(?:[^"]|\\")*)" "(?P<selector_string>[^"]*)" should not exist in current page administration$/
     *
     * @throws ExpectationException
     * @param string $element The locator of the specified selector.
     *     This may be a path, for example "Subscription mode > Forced subscription"
     * @param string $selectortype The selector type (link or text)
     * @return void
     */
    public function should_not_exist_in_current_page_administration($element, $selectortype) {
        $nodes = array_map('trim', explode('>', $element));
        $nodetext = end($nodes);

// Find administration menu.
        $menuxpath = $this->find_header_administration_menu() ?: $this->find_page_administration_menu();
        if (!$menuxpath) {
            // Menu not found, exit.
            return;
        }

$this->toggle_page_administration_menu($menuxpath);
        $this->execute('behat_general::should_not_exist_in_the', [$nodetext, $selectortype, $menuxpath, 'xpath_element']);
        $this->toggle_page_administration_menu($menuxpath);
    }

/**
     * Go to site administration item
     *
     * @Given /^I navigate to "(?P<nodetext_string>(?:[^"]|\\")*)" in site administration$/
     *
     * @throws ExpectationException
     * @param string $nodetext navigation node to click, may contain path, for example "Reports > Overview"
     * @return void
     */
    public function i_navigate_to_in_site_administration($nodetext) {
        $nodelist = array_map('trim', explode('>', $nodetext));
        $this->i_select_from_flat_navigation_drawer(get_string('administrationsite'));
        $this->select_on_administration_page($nodelist);
    }

/**
     * Opens the current users profile page in edit mode.
     *
     * @Given /^I open my profile in edit mode$/
     * @throws coding_exception
     * @return void
     */
    public function i_open_my_profile_in_edit_mode() {
        global $USER;

$user = $this->get_session_user();
        $globuser = $USER;
        $USER = $user; // We need this set to the behat session user so we can call isloggedin.

$systemcontext = context_system::instance();

$bodynode = $this->find('xpath', 'body');
        $bodyclass = $bodynode->getAttribute('class');
        $matches = [];
        if (preg_match('/(?<=^course-|\scourse-)\d+/', $bodyclass, $matches) && !empty($matches)) {
            $courseid = intval($matches[0]);
        } else {
            $courseid = SITEID;
        }

if (isloggedin() && !isguestuser($user) && !is_mnet_remote_user($user)) {
            if (is_siteadmin($user) ||  has_capability('moodle/user:update', $systemcontext)) {
                $url = new moodle_url('/user/editadvanced.php', array('id' => $user->id, 'course' => SITEID,
                    'returnto' => 'profile'));
            } else if (has_capability('moodle/user:editownprofile', $systemcontext)) {
                $userauthplugin = false;
                if (!empty($user->auth)) {
                    $userauthplugin = get_auth_plugin($user->auth);
                }
                if ($userauthplugin && $userauthplugin->can_edit_profile()) {
                    $url = $userauthplugin->edit_profile_url();
                    if (empty($url)) {
                        if (empty($course)) {
                            $url = new moodle_url('/user/edit.php', array('id' => $user->id, 'returnto' => 'profile'));
                        } else {
                            $url = new moodle_url('/user/edit.php', array('id' => $user->id, 'course' => $courseid,
                                'returnto' => 'profile'));
                        }
                    }

}
            }
            $this->getSession()->visit($this->locate_path($url->out_as_local_url()));
        }

// Restore global user variable.
        $USER = $globuser;
    }

/**
     * Open a given page, belonging to a plugin or core component.
     *
     * The page-type are interpreted by each plugin to work out the
     * corresponding URL. See the resolve_url method in each class like
     * behat_mod_forum. That method should document which page types are
     * recognised, and how the name identifies them.
     *
     * For pages belonging to core, the 'core > ' bit is omitted.
     *
     * @When I am on the :page page
     * @param string $page the component and page name.
     *      E.g. 'Admin notifications' or 'core_user > Preferences'.
     * @throws Exception if the specified page cannot be determined.
     */
    public function i_am_on_page(string $page) {
        $this->getSession()->visit($this->locate_path(
                $this->resolve_page_helper($page)->out_as_local_url()));
    }

/**
     * Open a given page logged in as a given user.
     *
     * This is like the combination
     *   When I log in as "..."
     *   And I am on the "..." page
     * but with the advantage that you go straight to the desired page, without
     * having to wait for the Dashboard to load.
     *
     * @When I am on the :page page logged in as :username
     * @param string $page the type of page. E.g. 'Admin notifications' or 'core_user > Preferences'.
     * @param string $username the name of the user to log in as. E.g. 'admin'.
     * @throws Exception if the specified page cannot be determined.
     */
    public function i_am_on_page_logged_in_as(string $page, string $username) {
        self::execute('behat_auth::i_log_in_as', [$username, $this->resolve_page_helper($page)]);
    }

/**
     * Helper used by i_am_on_page() and i_am_on_page_logged_in_as().
     *
     * @param string $page the type of page. E.g. 'Admin notifications' or 'core_user > Preferences'.
     * @return moodle_url the corresponding URL.
     */
    protected function resolve_page_helper(string $page): moodle_url {
        list($component, $name) = $this->parse_page_name($page);
        if ($component === 'core') {
            return $this->resolve_core_page_url($name);
        } else {
            $context = behat_context_helper::get('behat_' . $component);
            return $context->resolve_page_url($name);
        }
    }

/**
     * Parse a full page name like 'Admin notifications' or 'core_user > Preferences'.
     *
     * E.g. parsing 'mod_quiz > View' gives ['mod_quiz', 'View'].
     *
     * @param string $page the full page name
     * @return array with two elements, component and page name.
     */
    protected function parse_page_name(string $page): array {
        $dividercount = substr_count($page, ' > ');
        if ($dividercount === 0) {
            return ['core', $page];
        } else if ($dividercount === 1) {
            list($component, $name) = explode(' > ', $page);
            if ($component === 'core') {
                throw new coding_exception('Do not specify the component "core > ..." for core pages.');
            }
            return [$component, $name];
        } else {
            throw new coding_exception('The page name most be in the form ' .
                    '"{page-name}" for core pages, or "{component} > {page-name}" ' .
                    'for pages belonging to other components. ' .
                    'For example "Admin notifications" or "mod_quiz > View".');
        }
    }

/**
     * Open a given instance of a page, belonging to a plugin or core component.
     *
     * The instance identifier and page-type are interpreted by each plugin to
     * work out the corresponding URL. See the resolve_page_instance_url method
     * in each class like behat_mod_forum. That method should document which page
     * types are recognised, and how the name identifies them.
     *
     * For pages belonging to core, the 'core > ' bit is omitted.
     *
     * @When I am on the :identifier :type page
     * @param string $identifier identifies the particular page. E.g. 'Test quiz'.
     * @param string $type the component and page type. E.g. 'mod_quiz > View'.
     * @throws Exception if the specified page cannot be determined.
     */
    public function i_am_on_page_instance(string $identifier, string $type) {
        $this->getSession()->visit($this->locate_path(
                $this->resolve_page_instance_helper($identifier, $type)->out_as_local_url()));
    }

/**
     * Open a given page logged in as a given user.
     *
     * This is like the combination
     *   When I log in as "..."
     *   And I am on the "..." "..." page
     * but with the advantage that you go straight to the desired page, without
     * having to wait for the Dashboard to load.
     *
     * @When I am on the :identifier :type page logged in as :username
     * @param string $identifier identifies the particular page. E.g. 'Test quiz'.
     * @param string $type the component and page type. E.g. 'mod_quiz > View'.
     * @param string $username the name of the user to log in as. E.g. 'student'.
     * @throws Exception if the specified page cannot be determined.
     */
    public function i_am_on_page_instance_logged_in_as(string $identifier,
            string $type, string $username) {
        self::execute('behat_auth::i_log_in_as',
                [$username, $this->resolve_page_instance_helper($identifier, $type)]);
    }

/**
     * Helper used by i_am_on_page() and i_am_on_page_logged_in_as().
     *
     * @param string $identifier identifies the particular page. E.g. 'Test quiz'.
     * @param string $pagetype the component and page type. E.g. 'mod_quiz > View'.
     * @return moodle_url the corresponding URL.
     */
    protected function resolve_page_instance_helper(string $identifier, string $pagetype): moodle_url {
        list($component, $type) = $this->parse_page_name($pagetype);
        if ($component === 'core') {
            return $this->resolve_core_page_instance_url($type, $identifier);
        } else {
            $context = behat_context_helper::get('behat_' . $component);
            return $context->resolve_page_instance_url($type, $identifier);
        }
    }

/**
     * Convert core page names to URLs for steps like 'When I am on the "[page name]" page'.
     *
     * Recognised page names are:
     * | Homepage            | Homepage (normally dashboard).                                 |
     * | Admin notifications | Admin notification screen.                                     |
     *
     * @param string $name identifies which identifies this page, e.g. 'Homepage', 'Admin notifications'.
     * @return moodle_url the corresponding URL.
     * @throws Exception with a meaningful error message if the specified page cannot be found.
     */
    protected function resolve_core_page_url(string $name): moodle_url {
        switch ($name) {
            case 'Homepage':
                return new moodle_url('/');

case 'Admin notifications':
                return new moodle_url('/admin/');

default:
                throw new Exception('Unrecognised core page type "' . $name . '."');
        }
    }

/**
     * Convert page names to URLs for steps like 'When I am on the "[identifier]" "[page type]" page'.
     *
     * Recognised page names are:
     * | Page type     | Identifier meaning | description                          |
     * | Category page | category idnumber  | List of courses in that category.    |
     * | Course        | course shortname   | Main course home pag                 |
     * | Activity      | activity idnumber  | Start page for that activity         |
     *
     * @param string $type identifies which type of page this is, e.g. 'Category page'.
     * @param string $identifier identifies the particular page, e.g. 'test-cat'.
     * @return moodle_url the corresponding URL.
     * @throws Exception with a meaningful error message if the specified page cannot be found.
     */
    protected function resolve_core_page_instance_url(string $type, string $identifier): moodle_url {
        global $DB;

switch ($type) {
            case 'Category page':
                $categoryid = $DB->get_field('course_categories', 'id', ['idnumber' => $identifier]);
                if (!$categoryid) {
                    throw new Exception('The specified category with idnumber "' . $identifier . '" does not exist');
                }
                return new moodle_url('/course/category.php', ['id' => $categoryid]);

case 'Course':
                $courseid = $DB->get_field_select('course', 'id', 'shortname = ?', [$identifier], IGNORE_MISSING);
                if (!$courseid) {
                    throw new Exception('The specified course with shortname, fullname, or idnumber "' .
                            $identifier . '" does not exist');
                }
                return new moodle_url('/course/view.php', ['id' => $courseid]);

case 'Activity':
                $cm = $DB->get_record('course_modules', ['idnumber' => $identifier], 'id, course', IGNORE_MISSING);
                if (!$cm) {
                    throw new Exception('The specified activity with idnumber "' . $identifier . '" does not exist');
                }
                $modinfo = get_fast_modinfo($cm->course);
                return $modinfo->cms[$cm->id]->url;

default:
                throw new Exception('Unrecognised core page type "' . $type . '."');
        }
    }

/**
     * Opens the course homepage. (Consider using 'I am on the "shortname" "Course" page' step instead.)
     *
     * @Given /^I am on "(?P<coursefullname_string>(?:[^"]|\\")*)" course homepage$/
     * @throws coding_exception
     * @param string $coursefullname The full name of the course.
     * @return void
     */
    public function i_am_on_course_homepage($coursefullname) {
        global $DB;
        $course = $DB->get_record("course", array("fullname" => $coursefullname), 'id', MUST_EXIST);
        $url = new moodle_url('/course/view.php', ['id' => $course->id]);
        $this->getSession()->visit($this->locate_path($url->out_as_local_url(false)));
    }

/**
     * Opens the course homepage with editing mode on.
     *
     * @Given /^I am on "(?P<coursefullname_string>(?:[^"]|\\")*)" course homepage with editing mode on$/
     * @throws coding_exception
     * @param string $coursefullname The course full name of the course.
     * @return void
     */
    public function i_am_on_course_homepage_with_editing_mode_on($coursefullname) {
        global $DB;
        $course = $DB->get_record("course", array("fullname" => $coursefullname), 'id', MUST_EXIST);
        $url = new moodle_url('/course/view.php', ['id' => $course->id]);
        $this->getSession()->visit($this->locate_path($url->out_as_local_url(false)));
        try {
            $this->execute("behat_forms::press_button", get_string('turneditingon'));
        } catch (Exception $e) {
            $this->execute("behat_navigation::i_navigate_to_in_current_page_administration", [get_string('turneditingon')]);
        }
    }

/**
     * Opens the flat navigation drawer if it is not already open
     *
     * @When /^I open flat navigation drawer$/
     * @throws ElementNotFoundException Thrown by behat_base::find
     */
    public function i_open_flat_navigation_drawer() {
        if (!$this->running_javascript()) {
            // Navigation drawer is always open without JS.
            return;
        }
        $xpath = "//button[contains(@data-action,'toggle-drawer')]";
        $node = $this->find('xpath', $xpath);
        $expanded = $node->getAttribute('aria-expanded');
        if ($expanded === 'false') {
            $node->click();
            $this->ensure_node_attribute_is_set($node, 'aria-expanded', 'true');
            $this->wait_for_pending_js();
        }
    }

/**
     * Closes the flat navigation drawer if it is open (does nothing if JS disabled)
     *
     * @When /^I close flat navigation drawer$/
     * @throws ElementNotFoundException Thrown by behat_base::find
     */
    public function i_close_flat_navigation_drawer() {
        if (!$this->running_javascript()) {
            // Navigation drawer can not be closed without JS.
            return;
        }
        $xpath = "//button[contains(@data-action,'toggle-drawer')]";
        $node = $this->find('xpath', $xpath);
        $expanded = $node->getAttribute('aria-expanded');
        if ($expanded === 'true') {
            $node->click();
            $this->wait_for_pending_js();
        }
    }

/**
     * Clicks link with specified id|title|alt|text in the flat navigation drawer.
     *
     * @When /^I select "(?P<link_string>(?:[^"]|\\")*)" from flat navigation drawer$/
     * @throws ElementNotFoundException Thrown by behat_base::find
     * @param string $link
     */
    public function i_select_from_flat_navigation_drawer($link) {
        $this->i_open_flat_navigation_drawer();
        $this->execute('behat_general::i_click_on_in_the', [$link, 'link', '#nav-drawer', 'css_element']);
    }

/**
     * If we are not on the course main page, click on the course link in the navbar
     */
    protected function go_to_main_course_page() {
        $url = $this->getSession()->getCurrentUrl();
        if (!preg_match('|/course/view.php\?id=[\d]+$|', $url)) {
            $this->find('xpath', '//header//div[@id=\'page-navbar\']//a[contains(@href,\'/course/view.php?id=\')]')->click();
            $this->execute('behat_general::wait_until_the_page_is_ready');
        }
    }

/**
     * Finds and clicks a link on the admin page (site administration or course administration)
     *
     * @param array $nodelist
     */
    protected function select_on_administration_page($nodelist) {
        $parentnodes = $nodelist;
        $lastnode = array_pop($parentnodes);
        $xpath = '//section[@id=\'region-main\']';

// Check if there is a separate tab for this submenu of the page. If found go to it.
        if ($parentnodes) {
            $tabname = behat_context_helper::escape($parentnodes[0]);
            $tabxpath = '//ul[@role=\'tablist\']/li/a[contains(normalize-space(.), ' . $tabname . ')]';
            if ($node = $this->getSession()->getPage()->find('xpath', $tabxpath)) {
                if ($this->running_javascript()) {
                    // Click on the tab and add 'active' tab to the xpath.
                    $node->click();
                    $xpath .= '//div[contains(@class,\'active\')]';
                } else {
                    // Add the tab content selector to the xpath.
                    $tabid = behat_context_helper::escape(ltrim($node->getAttribute('href'), '#'));
                    $xpath .= '//div[@id = ' . $tabid . ']';
                }
                array_shift($parentnodes);
            }
        }

// Find a section with the parent name in it.
        if ($parentnodes) {
            // Find the section on the page (links may be repeating in different sections).
            $section = behat_context_helper::escape($parentnodes[0]);
            $xpath .= '//div[@class=\'row\' and contains(.,'.$section.')]';
        }

// Find a link and click on it.
        $linkname = behat_context_helper::escape($lastnode);
        $xpath .= '//a[contains(normalize-space(.), ' . $linkname . ')]';
        if (!$node = $this->getSession()->getPage()->find('xpath', $xpath)) {
            throw new ElementNotFoundException($this->getSession(), 'Link "' . join(' > ', $nodelist) . '"');
        }
        $node->click();
        $this->wait_for_pending_js();
    }

/**
     * Locates the administration menu in the <header> element and returns its xpath
     *
     * @param bool $mustexist if specified throws an exception if menu is not found
     * @return null|string
     */
    protected function find_header_administration_menu($mustexist = false) {
        $menuxpath = '//header[@id=\'page-header\']//div[contains(@class,\'moodle-actionmenu\')]';
        if ($mustexist) {
            $exception = new ElementNotFoundException($this->getSession(), 'Page header administration menu');
            $this->find('xpath', $menuxpath, $exception);
        } else if (!$this->getSession()->getPage()->find('xpath', $menuxpath)) {
            return null;
        }
        return $menuxpath;
    }

/**
     * Locates the administration menu on the page (but not in the header) and returns its xpath
     *
     * @param bool $mustexist if specified throws an exception if menu is not found
     * @return null|string
     */
    protected function find_page_administration_menu($mustexist = false) {
        $menuxpath = '//div[@id=\'region-main-settings-menu\']';
        if ($mustexist) {
            $exception = new ElementNotFoundException($this->getSession(), 'Page administration menu');
            $this->find('xpath', $menuxpath, $exception);
        } else if (!$this->getSession()->getPage()->find('xpath', $menuxpath)) {
            return null;
        }
        return $menuxpath;
    }

/**
     * Toggles administration menu
     *
     * @param string $menuxpath (optional) xpath to the page administration menu if already known
     */
    protected function toggle_page_administration_menu($menuxpath = null) {
        if (!$menuxpath) {
            $menuxpath = $this->find_header_administration_menu() ?: $this->find_page_administration_menu();
        }
        if ($menuxpath && $this->running_javascript()) {
            $this->find('xpath', $menuxpath . '//a[@data-toggle=\'dropdown\']')->click();
            $this->wait_for_pending_js();
        }
    }

/**
     * Finds a page edit cog and select an item from it
     *
     * If the page edit cog is in the page header and the item is not found there, click "More..." link
     * and find the item on the course/frontpage administration page
     *
     * @param array $nodelist
     * @throws ElementNotFoundException
     */
    protected function select_from_administration_menu($nodelist) {
        // Find administration menu.
        if ($menuxpath = $this->find_header_administration_menu()) {
            $isheader = true;
        } else {
            $menuxpath = $this->find_page_administration_menu(true);
            $isheader = false;
        }

$this->toggle_page_administration_menu($menuxpath);

if (!$isheader || count($nodelist) == 1) {
            $lastnode = end($nodelist);
            $linkname = behat_context_helper::escape($lastnode);
            $link = $this->getSession()->getPage()->find('xpath', $menuxpath . '//a[contains(normalize-space(.), ' . $linkname . ')]');
            if ($link) {
                $link->click();
                $this->wait_for_pending_js();
                return;
            }
        }

if ($isheader) {
            // Course administration and Front page administration will have subnodes under "More...".
            $linkname = behat_context_helper::escape(get_string('morenavigationlinks'));
            $link = $this->getSession()->getPage()->find('xpath', $menuxpath . '//a[contains(normalize-space(.), ' . $linkname . ')]');
            if ($link) {
                $link->click();
                $this->execute('behat_general::wait_until_the_page_is_ready');
                $this->select_on_administration_page($nodelist);
                return;
            }
        }

throw new ElementNotFoundException($this->getSession(),
                'Link "' . join(' > ', $nodelist) . '" in the current page edit menu"');
    }
}