<?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/>.

/**
 * Defines the base class form used by blocks/edit.php to edit block instance configuration.
 *
 * It works with the {@link block_edit_form} class, or rather the particular
 * subclass defined by this block, to do the editing.
 *
 * @package   moodlecore
 * @copyright 2009 Tim Hunt
 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

require_once($CFG->libdir . '/formslib.php');

/**
 * The base class form used by blocks/edit.php to edit block instance configuration.
 *
 * @copyright 2009 Tim Hunt
 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class block_edit_form extends moodleform {
    const MAX_WEIGHT = 10;
    /**
     * The block instance we are editing.
     * @var block_base
     */
    public $block;
    /**
     * The page we are editing this block in association with.
     * @var moodle_page
     */
    public $page;

    function __construct($block, $page) {
        global $CFG;
        $this->block = $block;
        $this->page = $page;
        parent::moodleform(block_edit_url($block, $page));
    }

    function definition() {
        $mform =& $this->_form;

        // First show fields specific to this type of block.
        $this->specific_definition($mform);

        // Then show the fields about where this block appears.
        $mform->addElement('header', 'whereheader', get_string('wherethisblockappears', 'block'));

        // If the current weight of the block is out-of-range, add that option in.
        $blockweight = $this->block->instance->weight;
        $weightoptions = array();
        if ($blockweight < -self::MAX_WEIGHT) {
            $weightoptions[$blockweight] = $blockweight;
        }
        for ($i = -self::MAX_WEIGHT; $i <= self::MAX_WEIGHT; $i++) {
            $weightoptions[$i] = $i;
        }
        if ($blockweight > self::MAX_WEIGHT) {
            $weightoptions[$blockweight] = $blockweight;
        }
        $first = reset($weightoptions);
        $weightoptions[$first] = get_string('bracketfirst', 'block', $first);
        $last = end($weightoptions);
        $weightoptions[$last] = get_string('bracketlast', 'block', $last);

        $regionoptions = $this->page->theme->get_all_block_regions();

        $parentcontext = get_context_instance_by_id($this->block->instance->parentcontextid);
        $mform->addElement('static', 'contextname', get_string('thisblockbelongsto', 'block'), print_context_name($parentcontext));

        $mform->addElement('selectyesno', 'showinsubcontexts', get_string('appearsinsubcontexts', 'block'));

        $pagetypeoptions = matching_page_type_patterns($this->page->pagetype);
        $pagetypeoptions = array_combine($pagetypeoptions, $pagetypeoptions);
        $mform->addElement('select', 'pagetypepattern', get_string('pagetypes', 'block'), $pagetypeoptions);

        if ($this->page->subpage) {
            $subpageoptions = array(
                '%@NULL@%' => get_string('anypagematchingtheabove', 'block'),
                $this->page->subpage => get_string('thisspecificpage', 'block', $this->page->subpage),
            );
            $mform->addElement('select', 'subpagepattern', get_string('subpages', 'block'), $subpageoptions);
        }

        $defaultregionoptions = $regionoptions;
        $defaultregion = $this->block->instance->defaultregion;
        if (!array_key_exists($defaultregion, $defaultregionoptions)) {
            $defaultregionoptions[$defaultregion] = $defaultregion;
        }
        $mform->addElement('select', 'defaultregion', get_string('defaultregion', 'block'), $defaultregionoptions);

        $mform->addElement('select', 'defaultweight', get_string('defaultweight', 'block'), $weightoptions);

        // Where this block is positioned on this page.
        $mform->addElement('header', 'whereheader', get_string('onthispage', 'block'));

        $mform->addElement('selectyesno', 'visible', get_string('visible', 'block'));

        $blockregion = $this->block->instance->region;
        if (!array_key_exists($blockregion, $regionoptions)) {
            $regionoptions[$blockregion] = $blockregion;
        }
        $mform->addElement('select', 'region', get_string('region', 'block'), $regionoptions);

        $mform->addElement('select', 'weight', get_string('weight', 'block'), $weightoptions);

        $this->add_action_buttons();
    }

    function set_data($defaults) {
        // Copy block config into config_ fields.
        if (!empty($this->block->config)) {
            foreach ($this->block->config as $field => $value) {
                $configfield = 'config_' . $field;
                $defaults->$configfield = $value;
            }
        }

        // Munge ->subpagepattern becuase HTML selects don't play nicely with NULLs.
        if (empty($defaults->subpagepattern)) {
            $defaults->subpagepattern = '%@NULL@%';
        }

        parent::set_data($defaults);
    }

    /**
     * Override this to create any form fields specific to this type of block.
     * @param object $mform the form being built.
     */
    protected function specific_definition($mform) {
        // By default, do nothing.
    }
}