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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/>.

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

require_once(__DIR__ . '/behat_question_base.php');

use Behat\Gherkin\Node\TableNode as TableNode;
use Behat\Mink\Exception\ExpectationException as ExpectationException;
use Behat\Mink\Exception\ElementNotFoundException as ElementNotFoundException;

/**
 * Steps definitions related with the question bank management.
 *
 * @package    core_question
 * @category   test
 * @copyright  2013 David Monllaó
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class behat_core_question extends behat_question_base {

/**
     * Convert page names to URLs for steps like 'When I am on the "[page name]" page'.
     *
     * Recognised page names are:
     * | None so far!      |                                                              |
     *
     * @param string $page name of the page, with the component name removed e.g. 'Admin notification'.
     * @return moodle_url the corresponding URL.
     * @throws Exception with a meaningful error message if the specified page cannot be found.
     */
    protected function resolve_page_url(string $page): moodle_url {
        switch (strtolower($page)) {
            default:
                throw new Exception('Unrecognised core_question page type "' . $page . '."');
        }
    }

/**
     * Convert page names to URLs for steps like 'When I am on the "[identifier]" "[page type]" page'.
     *
     * Recognised page names are:
     * | pagetype               | name meaning               | description                              |
     * | course question bank   | Course name                | The question bank for a course           |
     * | course question import | Course name                | The import questions screen for a course |
     * | course question export | Course name                | The export questions screen for a course |
     * | preview                | Question name              | The screen to preview a question         |
     * | edit                   | Question name              | The screen to edit a question            |
     *
     * @param string $type identifies which type of page this is, e.g. 'Preview'.
     * @param string $identifier identifies the particular page, e.g. 'My question'.
     * @return moodle_url the corresponding URL.
     * @throws Exception with a meaningful error message if the specified page cannot be found.
     */
    protected function resolve_page_instance_url(string $type, string $identifier): moodle_url {
        switch (strtolower($type)) {
            case 'course question bank':
                return new moodle_url('/question/edit.php',
                        ['courseid' => $this->get_course_id($identifier)]);

case 'course question categories':
                return new moodle_url('/question/bank/managecategories/category.php',
                        ['courseid' => $this->get_course_id($identifier)]);

case 'course question import':
                return new moodle_url('/question/bank/importquestions/import.php',
                        ['courseid' => $this->get_course_id($identifier)]);

case 'course question export':
                return new moodle_url('/question/bank/exportquestions/export.php',
                        ['courseid' => $this->get_course_id($identifier)]);

case 'preview':
                [$questionid, $otheridtype, $otherid] = $this->find_question_by_name($identifier);
                return new moodle_url('/question/bank/previewquestion/preview.php',
                        ['id' => $questionid, $otheridtype => $otherid]);

case 'edit':
                [$questionid, $otheridtype, $otherid] = $this->find_question_by_name($identifier);
                return new moodle_url('/question/bank/editquestion/question.php',
                        ['id' => $questionid, $otheridtype => $otherid]);

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

/**
     * Find a question, and where it is, from the question name.
     *
     * This is a helper used by resolve_page_instance_url.
     *
     * @param string $questionname
     * @return array with three elemnets, int question id, a string 'cmid' or 'courseid',
     *     and int either cmid or courseid as applicable.
     */
    protected function find_question_by_name(string $questionname): array {
        global $DB;
        $questionid = $DB->get_field('question', 'id', ['name' => $questionname], MUST_EXIST);
        $question = question_bank::load_question_data($questionid);
        $context = context_helper::instance_by_id($question->contextid);

if ($context->contextlevel == CONTEXT_MODULE) {
            return [$questionid, 'cmid', $context->instanceid];
        } else if ($context->contextlevel == CONTEXT_COURSE) {
            return [$questionid, 'courseid', $context->instanceid];
        } else {
            throw new coding_exception('Unsupported context level ' . $context->contextlevel);
        }
    }

/**
     * Creates a question in the current course questions bank with the provided data.
     * This step can only be used when creating question types composed by a single form.
     *
     * @Given /^I add a "(?P<question_type_name_string>(?:[^"]|\\")*)" question filling the form with:$/
     * @param string $questiontypename The question type name
     * @param TableNode $questiondata The data to fill the question type form.
     */
    public function i_add_a_question_filling_the_form_with($questiontypename, TableNode $questiondata) {
        // Click on create question.
        $this->execute('behat_forms::press_button', get_string('createnewquestion', 'question'));

// Add question.
        $this->finish_adding_question($questiontypename, $questiondata);
    }

/**
     * Checks the state of the specified question.
     *
     * @Then /^the state of "(?P<question_description_string>(?:[^"]|\\")*)" question is shown as "(?P<state_string>(?:[^"]|\\")*)"$/
     * @throws ExpectationException
     * @throws ElementNotFoundException
     * @param string $questiondescription
     * @param string $state
     */
    public function the_state_of_question_is_shown_as($questiondescription, $state) {

// Using xpath literal to avoid quotes problems.
        $questiondescriptionliteral = behat_context_helper::escape($questiondescription);
        $stateliteral = behat_context_helper::escape($state);

// Split in two checkings to give more feedback in case of exception.
        $exception = new ElementNotFoundException($this->getSession(), 'Question "' . $questiondescription . '" ');
        $questionxpath = "//div[contains(concat(' ', normalize-space(@class), ' '), ' que ')]" .
                "[contains(div[@class='content']/div[contains(concat(' ', normalize-space(@class), ' '), ' formulation ')]," .
                "{$questiondescriptionliteral})]";
        $this->find('xpath', $questionxpath, $exception);

$exception = new ExpectationException('Question "' . $questiondescription .
                '" state is not "' . $state . '"', $this->getSession());
        $xpath = $questionxpath . "/div[@class='info']/div[@class='state' and contains(., {$stateliteral})]";
        $this->find('xpath', $xpath, $exception);
    }

/**
     * Activates a particular action on a particular question in the question bank UI.
     *
     * @When I choose :action action for :questionname in the question bank
     * @param string $action the label for the action you want to activate.
     * @param string $questionname the question name.
     */
    public function i_action_the_question($action, $questionname) {
        if ($this->running_javascript()) {
            // This method isn't allowed unless Javascript is running.
            $this->execute('behat_action_menu::i_open_the_action_menu_in', [
                $questionname,
                'table_row',
            ]);
            $this->execute('behat_action_menu::i_choose_in_the_open_action_menu', [
                $action
            ]);
        } else {
            // This method doesn't open the menu correctly when Javascript is running.
            $this->execute('behat_action_menu::i_choose_in_the_named_menu_in_container', [
                $action,
                get_string('edit', 'core'),
                $questionname,
                'table_row',
            ]);
        }
    }

/**
     * Checks that action does exist for a question.
     *
     * @Then the :action action should exist for the :questionname question in the question bank
     * @param string $action the label for the action you want to activate.
     * @param string $questionname the question name.
     */
    public function action_exists($action, $questionname) {
        $this->execute('behat_action_menu::item_should_exist_in_the', [
            $action,
            get_string('edit', 'core'),
            $questionname,
            'table_row',
        ]);
    }

/**
     * Checks that action does not exist for a question.
     *
     * @Then the :action action should not exist for the :questionname question in the question bank
     * @param string $action the label for the action you want to activate.
     * @param string $questionname the question name.
     */
    public function action_not_exists($action, $questionname) {
        $this->execute('behat_action_menu::item_should_not_exist_in_the', [
            $action,
            get_string('edit', 'core'),
            $questionname,
            'table_row',
        ]);
    }

/**
     * A particular bulk action is visible in the question bank UI.
     *
     * @When I should see question bulk action :action
     * @param string $action the value of the input for the action.
     */
    public function i_should_see_question_bulk_action($action) {
        // Check if its visible.
        $this->execute("behat_general::should_be_visible",
            ["#bulkactionsui-container input[name='$action']", "css_element"]);
    }

/**
     * A particular bulk action should not be visible in the question bank UI.
     *
     * @When I should not see question bulk action :action
     * @param string $action the value of the input for the action.
     */
    public function i_should_not_see_question_bulk_action($action) {
        // Check if its visible.
        $this->execute("behat_general::should_not_be_visible",
            ["#bulkactionsui-container input[name='$action']", "css_element"]);
    }

/**
     * A click on a particular bulk action in the question bank UI.
     *
     * @When I click on question bulk action :action
     * @param string $action the value of the input for the action.
     */
    public function i_click_on_question_bulk_action($action) {
        // Click the bulk action.
        $this->execute("behat_general::i_click_on",
            ["#bulkactionsui-container input[name='$action']", "css_element"]);
    }

/**
     * Change the question type of the give question to a type that does not exist.
     *
     * This is useful for testing robustness of the code when a question type
     * has been uninstalled, even though there are still questions of that type
     * or attempts at them.
     *
     * In order to set things up, you probably need to start by generating
     * questions of a valid type, then using this to change the type once the
     * data is created.
     *
     * @Given question :questionname is changed to simulate being of an uninstalled type
     * @param string $questionname the question name.
     */
    public function change_question_to_nonexistant_type($questionname) {
        global $DB;
        [$id] = $this->find_question_by_name($questionname);

// Check our assumption.
        $nonexistanttype = 'invalidqtype';
        if (question_bank::is_qtype_installed($nonexistanttype)) {
            throw new coding_exception('This code assumes that the qtype_' . $nonexistanttype .
                    ' is not a valid plugin name, but that plugin now seems to exist!');
        }

$DB->set_field('question', 'qtype', $nonexistanttype, ['id' => $id]);
        question_bank::notify_question_edited($id);
    }

/**
     * Forcibly delete a question from the database.
     *
     * This is useful for testing robustness of the code when a question
     * record is no longer in the database, even though it is referred to.
     * Obviously, this should never happen, but it has been known to in the past
     * and so we sometimes need to be able to test the code can handle this situation.
     *
     * In order to set things up, you probably need to start by generating
     * a valid questions, then using this to remove it once the data is created.
     *
     * @Given question :questionname no longer exists in the database
     * @param string $questionname the question name.
     */
    public function remove_question_from_db($questionname) {
        global $DB;
        [$id] = $this->find_question_by_name($questionname);
        $DB->delete_records('question', ['id' => $id]);
        question_bank::notify_question_edited($id);
    }

/**
     * Add a question bank filter
     *
     * This will add the filter if it does not exist, but leave the value empty.
     *
     * @When I add question bank filter :filtertype
     * @param string $filtertype The filter we are adding
     */
    public function i_add_question_bank_filter(string $filtertype) {
        $filter = $this->getSession()->getPage()->find('css',
                '[data-filterregion=filter] [data-field-title="' . $filtertype . '"]');
        if ($filter === null) {
            $this->execute('behat_forms::press_button', [get_string('addcondition')]);
            $this->execute('behat_forms::i_set_the_field_in_container_to', [
                    "type",
                    "[data-filterregion=filter]:last-child fieldset",
                    "css_element",
                    $filtertype
            ]);
        }
    }

/**
     * Apply question bank filter.
     *
     * This will change the existing value of the specified filter, or add the filter and set its value if it doesn't already
     * exist.
     *
     * @When I apply question bank filter :filtertype with value :value
     * @param string $filtertype The filter to apply. This should match the get_title() return value from the
     *        filter's condition class.
     * @param string $value The value to set for the condition.
     */
    public function i_apply_question_bank_filter(string $filtertype, string $value) {
        // Add the filter if needed.
        $this->execute('behat_core_question::i_add_question_bank_filter', [
            $filtertype,
        ]);

// Set the filter value.
        $this->execute('behat_forms::i_set_the_field_to', [
            $filtertype,
            $value
        ]);

// Apply filters.
        $this->execute("behat_forms::press_button", [get_string('applyfilters')]);
    }
}

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