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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/>.

/**
 * Tour helper.
 *
 * @package    tool_usertours
 * @copyright  2016 Andrew Nicols <andrew@nicols.co.uk>
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

namespace tool_usertours;

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

/**
 * Tour helper.
 *
 * @copyright  2016 Andrew Nicols <andrew@nicols.co.uk>
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class helper {

/**
     * @var MOVE_UP
     */
    const MOVE_UP = -1;

/**
     * @var MOVE_DOWN
     */
    const MOVE_DOWN = 1;

/**
     * @var boolean Has it been bootstrapped?
     */
    private static $bootstrapped = false;

/**
     * Get the link to edit the step.
     *
     * If no stepid is specified, then a link to create a new step is provided. The $targettype must be specified in this case.
     *
     * @param   int     $tourid     The tour that the step belongs to.
     * @param   int     $stepid     The step ID.
     * @param   int     $targettype The type of step.
     *
     * @return moodle_url
     */
    public static function get_edit_step_link($tourid, $stepid = null, $targettype = null) {
        $link = new \moodle_url('/admin/tool/usertours/configure.php');

if ($stepid) {
            $link->param('action', manager::ACTION_EDITSTEP);
            $link->param('id', $stepid);
        } else {
            $link->param('action', manager::ACTION_NEWSTEP);
            $link->param('tourid', $tourid);
        }

return $link;
    }

/**
     * Get the link to move the tour.
     *
     * @param   int     $tourid     The tour ID.
     * @param   int     $direction  The direction to move in
     *
     * @return moodle_url
     */
    public static function get_move_tour_link($tourid, $direction = self::MOVE_DOWN) {
        $link = new \moodle_url('/admin/tool/usertours/configure.php');

$link->param('action', manager::ACTION_MOVETOUR);
        $link->param('id', $tourid);
        $link->param('direction', $direction);
        $link->param('sesskey', sesskey());

return $link;
    }

/**
     * Get the link to move the step.
     *
     * @param   int     $stepid     The step ID.
     * @param   int     $direction  The direction to move in
     *
     * @return moodle_url
     */
    public static function get_move_step_link($stepid, $direction = self::MOVE_DOWN) {
        $link = new \moodle_url('/admin/tool/usertours/configure.php');

$link->param('action', manager::ACTION_MOVESTEP);
        $link->param('id', $stepid);
        $link->param('direction', $direction);
        $link->param('sesskey', sesskey());

return $link;
    }

/**
     * Get the link ot create a new step.
     *
     * @param   int         $tourid     The ID of the tour to attach this step to.
     * @param   int         $targettype The type of target.
     *
     * @return  moodle_url              The required URL.
     */
    public static function get_new_step_link($tourid, $targettype = null) {
        $link = new \moodle_url('/admin/tool/usertours/configure.php');
        $link->param('action', manager::ACTION_NEWSTEP);
        $link->param('tourid', $tourid);
        $link->param('targettype', $targettype);

return $link;
    }

/**
     * Get the link used to view the tour.
     *
     * @param   int         $tourid     The ID of the tour to display.
     * @return  moodle_url              The URL.
     */
    public static function get_view_tour_link($tourid) {
        return new \moodle_url('/admin/tool/usertours/configure.php', [
                'id'        => $tourid,
                'action'    => manager::ACTION_VIEWTOUR,
            ]);
    }

/**
     * Get the link used to reset the tour state for all users.
     *
     * @param   int         $tourid     The ID of the tour to display.
     * @return  moodle_url              The URL.
     */
    public static function get_reset_tour_for_all_link($tourid) {
        return new \moodle_url('/admin/tool/usertours/configure.php', [
                'id'        => $tourid,
                'action'    => manager::ACTION_RESETFORALL,
                'sesskey'   => sesskey(),
            ]);
    }

/**
     * Get the link used to edit the tour.
     *
     * @param   int         $tourid     The ID of the tour to edit.
     * @return  moodle_url              The URL.
     */
    public static function get_edit_tour_link($tourid = null) {
        $link = new \moodle_url('/admin/tool/usertours/configure.php');

if ($tourid) {
            $link->param('action', manager::ACTION_EDITTOUR);
            $link->param('id', $tourid);
        } else {
            $link->param('action', manager::ACTION_NEWTOUR);
        }

return $link;
    }

/**
     * Get the link used to import the tour.
     *
     * @return  moodle_url              The URL.
     */
    public static function get_import_tour_link() {
        $link = new \moodle_url('/admin/tool/usertours/configure.php', [
                'action'    => manager::ACTION_IMPORTTOUR,
            ]);

return $link;
    }

/**
     * Get the link used to export the tour.
     *
     * @param   int         $tourid     The ID of the tour to export.
     * @return  moodle_url              The URL.
     */
    public static function get_export_tour_link($tourid) {
        $link = new \moodle_url('/admin/tool/usertours/configure.php', [
                'action'    => manager::ACTION_EXPORTTOUR,
                'id'        => $tourid,
            ]);

return $link;
    }

/**
     * Get the link used to delete the tour.
     *
     * @param   int         $tourid     The ID of the tour to delete.
     * @return  moodle_url              The URL.
     */
    public static function get_delete_tour_link($tourid) {
        return new \moodle_url('/admin/tool/usertours/configure.php', [
                'id'        => $tourid,
                'action'    => manager::ACTION_DELETETOUR,
                'sesskey'   => sesskey(),
            ]);
    }

/**
     * Get the link for listing tours.
     *
     * @return  moodle_url              The URL.
     */
    public static function get_list_tour_link() {
        $link = new \moodle_url('/admin/tool/usertours/configure.php');
        $link->param('action', manager::ACTION_LISTTOURS);

return $link;
    }

/**
     * Get a filler icon for display in the actions column of a table.
     *
     * @param   string      $url            The URL for the icon.
     * @param   string      $icon           The icon identifier.
     * @param   string      $alt            The alt text for the icon.
     * @param   string      $iconcomponent  The icon component.
     * @param   array       $options        Display options.
     * @return  string
     */
    public static function format_icon_link($url, $icon, $alt, $iconcomponent = 'moodle', $options = array()) {
        global $OUTPUT;

return $OUTPUT->action_icon(
                $url,
                new \pix_icon($icon, $alt, $iconcomponent, [
                        'title' => $alt,
                    ]),
                null,
                $options
                );

}

/**
     * Get a filler icon for display in the actions column of a table.
     *
     * @param   array       $options        Display options.
     * @return  string
     */
    public static function get_filler_icon($options = array()) {
        global $OUTPUT;

return \html_writer::span(
            $OUTPUT->pix_icon('t/filler', '', 'tool_usertours', $options),
            'action-icon'
        );
    }

/**
     * Get the link for deleting steps.
     *
     * @param   int         $stepid     The ID of the step to display.
     * @return  moodle_url              The URL.
     */
    public static function get_delete_step_link($stepid) {
        return new \moodle_url('/admin/tool/usertours/configure.php', [
                'action'    => manager::ACTION_DELETESTEP,
                'id'        => $stepid,
                'sesskey'   => sesskey(),
            ]);
    }

/**
     * Render the inplace editable used to edit the tour name.
     *
     * @param   tour        $tour       The tour to edit.
     * @return  string
     */
    public static function render_tourname_inplace_editable(tour $tour) {
        return new \core\output\inplace_editable(
                'tool_usertours',
                'tourname',
                $tour->get_id(),
                true,
                \html_writer::link(
                    $tour->get_view_link(),
                    $tour->get_name()
                ),
                $tour->get_name()
            );
    }

/**
     * Render the inplace editable used to edit the tour description.
     *
     * @param   tour        $tour       The tour to edit.
     * @return  string
     */
    public static function render_tourdescription_inplace_editable(tour $tour) {
        return new \core\output\inplace_editable(
                'tool_usertours',
                'tourdescription',
                $tour->get_id(),
                true,
                $tour->get_description(),
                $tour->get_description()
            );
    }

/**
     * Render the inplace editable used to edit the tour enable state.
     *
     * @param   tour        $tour       The tour to edit.
     * @return  string
     */
    public static function render_tourenabled_inplace_editable(tour $tour) {
        global $OUTPUT;

if ($tour->is_enabled()) {
            $icon = 't/hide';
            $alt = get_string('disable');
            $value = 1;
        } else {
            $icon = 't/show';
            $alt = get_string('enable');
            $value = 0;
        }

$editable = new \core\output\inplace_editable(
                'tool_usertours',
                'tourenabled',
                $tour->get_id(),
                true,
                $OUTPUT->pix_icon($icon, $alt, 'moodle', [
                        'title' => $alt,
                    ]),
                $value
            );

$editable->set_type_toggle();
        return $editable;
    }

/**
     * Render the inplace editable used to edit the step name.
     *
     * @param   step        $step       The step to edit.
     * @return  string
     */
    public static function render_stepname_inplace_editable(step $step) {
        $title = format_text(step::get_string_from_input($step->get_title()), FORMAT_HTML);

return new \core\output\inplace_editable(
                'tool_usertours',
                'stepname',
                $step->get_id(),
                true,
                \html_writer::link(
                    $step->get_edit_link(),
                    $title
                ),
                $step->get_title()
            );
    }

/**
     * Get all of the tours.
     *
     * @return  stdClass[]
     */
    public static function get_tours() {
        global $DB;

$tours = $DB->get_records('tool_usertours_tours', array(), 'sortorder ASC');
        $return = [];
        foreach ($tours as $tour) {
            $return[$tour->id] = tour::load_from_record($tour);
        }
        return $return;
    }

/**
     * Get the specified tour.
     *
     * @param   int         $tourid     The tour that the step belongs to.
     * @return  stdClass
     */
    public static function get_tour($tourid) {
        return tour::instance($tourid);
    }

/**
     * Fetch the tour with the specified sortorder.
     *
     * @param   int         $sortorder  The sortorder of the tour.
     * @return  tour
     */
    public static function get_tour_from_sortorder($sortorder) {
        global $DB;

$tour = $DB->get_record('tool_usertours_tours', array('sortorder' => $sortorder));
        return tour::load_from_record($tour);
    }

/**
     * Return the count of all tours.
     *
     * @return  int
     */
    public static function count_tours() {
        global $DB;

return $DB->count_records('tool_usertours_tours');
    }

/**
     * Reset the sortorder for all tours.
     */
    public static function reset_tour_sortorder() {
        global $DB;
        $tours = $DB->get_records('tool_usertours_tours', null, 'sortorder ASC, pathmatch DESC', 'id, sortorder');

$index = 0;
        foreach ($tours as $tour) {
            if ($tour->sortorder != $index) {
                $DB->set_field('tool_usertours_tours', 'sortorder', $index, array('id' => $tour->id));
            }
            $index++;
        }

// Notify the cache that a tour has changed.
        // Tours are only stored in the cache if there are steps.
        // If there step count has changed for some reason, this will change the potential cache results.
        cache::notify_tour_change();
    }

/**
     * Get all of the steps in the tour.
     *
     * @param   int         $tourid     The tour that the step belongs to.
     * @return  stdClass[]
     */
    public static function get_steps($tourid) {
        $steps = cache::get_stepdata($tourid);

$return = [];
        foreach ($steps as $step) {
            $return[$step->id] = step::load_from_record($step);
        }
        return $return;
    }

/**
     * Fetch the specified step.
     *
     * @param   int         $stepid     The id of the step to fetch.
     * @return  step
     */
    public static function get_step($stepid) {
        return step::instance($stepid);
    }

/**
     * Fetch the step with the specified sortorder.
     *
     * @param   int         $tourid     The tour that the step belongs to.
     * @param   int         $sortorder  The sortorder of the step.
     * @return  step
     */
    public static function get_step_from_sortorder($tourid, $sortorder) {
        global $DB;

$step = $DB->get_record('tool_usertours_steps', array('tourid' => $tourid, 'sortorder' => $sortorder));
        return step::load_from_record($step);
    }

/**
     * Handle addition of the tour into the current page.
     */
    public static function bootstrap() {
        global $PAGE;

if (!isloggedin() || isguestuser()) {
            return;
        }

if (in_array($PAGE->pagelayout, ['maintenance', 'print', 'redirect'])) {
            // Do not try to show user tours inside iframe, in maintenance mode,
            // when printing, or during redirects.
            return;
        }

if (self::$bootstrapped) {
            return;
        }
        self::$bootstrapped = true;

if ($tour = manager::get_current_tour()) {
            $PAGE->requires->js_call_amd('tool_usertours/usertours', 'init', [
                    $tour->get_id(),
                    $tour->should_show_for_user(),
                    $PAGE->context->id,
                ]);
        }
    }

/**
     * Add the reset link to the current page.
     */
    public static function bootstrap_reset() {
        if (manager::get_current_tour()) {
            echo \html_writer::link('', get_string('resettouronpage', 'tool_usertours'), [
                    'data-action'   => 'tool_usertours/resetpagetour',
                ]);
        }
    }

/**
     * Get a list of all possible filters.
     *
     * @return  array
     */
    public static function get_all_filters() {
        $filters = \core_component::get_component_classes_in_namespace('tool_usertours', 'local\filter');
        $filters = array_keys($filters);

$filters = array_filter($filters, function($filterclass) {
            $rc = new \ReflectionClass($filterclass);
            return $rc->isInstantiable();
        });

return $filters;
    }
}