<?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/>.

namespace theme_boost\output;

use coding_exception;
use html_writer;
use tabobject;
use tabtree;
use custom_menu_item;
use custom_menu;
use block_contents;
use stdClass;
use moodle_url;
use preferences_groups;
use action_menu;
use help_icon;
use single_button;
use single_select;
use paging_bar;
use url_select;
use context_course;
use pix_icon;

defined('MOODLE_INTERNAL') || die;

/**
 * Renderers to align Moodle's HTML with that expected by Bootstrap
 *
 * @package    theme_boost
 * @copyright  2012 Bas Brands, www.basbrands.nl
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

class core_renderer extends \core_renderer {

    /** @var custom_menu_item language The language menu if created */
    protected $language = null;

    /**
     * Outputs the opening section of a box.
     *
     * @param string $classes A space-separated list of CSS classes
     * @param string $id An optional ID
     * @param array $attributes An array of other attributes to give the box.
     * @return string the HTML to output.
     */
    public function box_start($classes = 'generalbox', $id = null, $attributes = array()) {
        if (is_array($classes)) {
            $classes = implode(' ', $classes);
        }
        return parent::box_start($classes . ' p-a-1', $id, $attributes);
    }

    /**
     * Wrapper for header elements.
     *
     * @return string HTML to display the main header.
     */
    public function full_header() {
        $html = html_writer::start_tag('header', array('id' => 'page-header', 'class' => 'row'));
        $html .= html_writer::start_div('col-xs-12 p-t-1 p-b-1');
        $html .= $this->context_header();
        $html .= html_writer::start_div('clearfix', array('id' => 'page-navbar'));
        $html .= html_writer::tag('div', $this->navbar(), array('class' => 'breadcrumb-nav'));
        $html .= html_writer::div($this->page_heading_button(), 'breadcrumb-button');
        $html .= html_writer::end_div();
        $html .= html_writer::tag('div', $this->course_header(), array('id' => 'course-header'));
        $html .= html_writer::end_div();
        $html .= html_writer::end_tag('header');
        return $html;
    }

    /**
     * The standard tags that should be included in the <head> tag
     * including a meta description for the front page
     *
     * @return string HTML fragment.
     */
    public function standard_head_html() {
        global $SITE, $PAGE;

        $output = parent::standard_head_html();
        if ($PAGE->pagelayout == 'frontpage') {
            $summary = s(strip_tags(format_text($SITE->summary, FORMAT_HTML)));
            if (!empty($summary)) {
                $output .= "<meta name=\"description\" content=\"$summary\" />\n";
            }
        }

        return $output;
    }

    /*
     * This renders the navbar.
     * Uses bootstrap compatible html.
     */
    public function navbar() {
        return $this->render_from_template('core/navbar', $this->page->navbar);
    }

    /**
     * Override to inject the logo.
     *
     * @param array $headerinfo The header info.
     * @param int $headinglevel What level the 'h' tag will be.
     * @return string HTML for the header bar.
     */
    public function context_header($headerinfo = null, $headinglevel = 1) {
        global $SITE;

        if ($this->should_display_main_logo($headinglevel)) {
            $sitename = format_string($SITE->fullname, true, array('context' => context_course::instance(SITEID)));
            return html_writer::div(html_writer::empty_tag('img', [
                'src' => $this->get_logo_url(null, 75), 'alt' => $sitename]), 'logo');
        }

        return parent::context_header($headerinfo, $headinglevel);
    }

    /**
     * Get the compact logo URL.
     *
     * @return string
     */
    public function get_compact_logo_url($maxwidth = 100, $maxheight = 100) {
        return parent::get_compact_logo_url(null, 35);
    }

    /**
     * Whether we should display the main logo.
     *
     * @return bool
     */
    public function should_display_main_logo($headinglevel = 1) {
        global $PAGE;

        // Only render the logo if we're on the front page or login page and the we have a logo.
        $logo = $this->get_logo_url();
        if ($headinglevel == 1 && !empty($logo)) {
            if ($PAGE->pagelayout == 'frontpage' || $PAGE->pagelayout == 'login') {
                return true;
            }
        }

        return false;
    }
    /**
     * Whether we should display the logo in the navbar.
     *
     * We will when there are no main logos, and we have compact logo.
     *
     * @return bool
     */
    public function should_display_navbar_logo() {
        $logo = $this->get_compact_logo_url();
        return !empty($logo) && !$this->should_display_main_logo();
    }

    /*
     * Overriding the custom_menu function ensures the custom menu is
     * always shown, even if no menu items are configured in the global
     * theme settings page.
     */
    public function custom_menu($custommenuitems = '') {
        global $CFG;

        if (empty($custommenuitems) && !empty($CFG->custommenuitems)) {
            $custommenuitems = $CFG->custommenuitems;
        }
        $custommenu = new custom_menu($custommenuitems, current_language());
        return $this->render_custom_menu($custommenu);
    }

    /*
     * This renders the bootstrap top menu.
     *
     * This renderer is needed to enable the Bootstrap style navigation.
     */
    protected function render_custom_menu(custom_menu $menu) {
        global $CFG;

        $langs = get_string_manager()->get_list_of_translations();
        $haslangmenu = $this->lang_menu() != '';

        if (!$menu->has_children() && !$haslangmenu) {
            return '';
        }

        if ($haslangmenu) {
            $strlang = get_string('language');
            $currentlang = current_language();
            if (isset($langs[$currentlang])) {
                $currentlang = $langs[$currentlang];
            } else {
                $currentlang = $strlang;
            }
            $this->language = $menu->add($currentlang, new moodle_url('#'), $strlang, 10000);
            foreach ($langs as $langtype => $langname) {
                $this->language->add($langname, new moodle_url($this->page->url, array('lang' => $langtype)), $langname);
            }
        }

        $content = '';
        foreach ($menu->get_children() as $item) {
            $context = $item->export_for_template($this);
            $content .= $this->render_from_template('core/custom_menu_item', $context);
        }

        return $content;
    }

    /**
     * This code renders the navbar button to control the display of the custom menu
     * on smaller screens.
     *
     * Do not display the button if the menu is empty.
     *
     * @return string HTML fragment
     */
    public function navbar_button() {
        global $CFG;

        if (empty($CFG->custommenuitems) && $this->lang_menu() == '') {
            return '';
        }

        $iconbar = html_writer::tag('span', '', array('class' => 'icon-bar'));
        $button = html_writer::tag('a', $iconbar . "\n" . $iconbar. "\n" . $iconbar, array(
            'class'       => 'btn btn-navbar',
            'data-toggle' => 'collapse',
            'data-target' => '.nav-collapse'
        ));
        return $button;
    }

    /**
     * Renders tabtree
     *
     * @param tabtree $tabtree
     * @return string
     */
    protected function render_tabtree(tabtree $tabtree) {
        if (empty($tabtree->subtree)) {
            return '';
        }
        $data = $tabtree->export_for_template($this);
        return $this->render_from_template('core/tabtree', $data);
    }

    /**
     * Renders tabobject (part of tabtree)
     *
     * This function is called from {@link core_renderer::render_tabtree()}
     * and also it calls itself when printing the $tabobject subtree recursively.
     *
     * @param tabobject $tabobject
     * @return string HTML fragment
     */
    protected function render_tabobject(tabobject $tab) {
        throw new coding_exception('Tab objects should not be directly rendered.');
    }

    /**
     * Prints a nice side block with an optional header.
     *
     * @param block_contents $bc HTML for the content
     * @param string $region the region the block is appearing in.
     * @return string the HTML to be output.
     */
    public function block(block_contents $bc, $region) {
        $bc = clone($bc); // Avoid messing up the object passed in.
        if (empty($bc->blockinstanceid) || !strip_tags($bc->title)) {
            $bc->collapsible = block_contents::NOT_HIDEABLE;
        }

        $id = !empty($bc->attributes['id']) ? $bc->attributes['id'] : uniqid('block-');
        $context = new stdClass();
        $context->skipid = $bc->skipid;
        $context->blockinstanceid = $bc->blockinstanceid;
        $context->dockable = $bc->dockable;
        $context->id = $id;
        $context->hidden = $bc->collapsible == block_contents::HIDDEN;
        $context->skiptitle = strip_tags($bc->title);
        $context->showskiplink = !empty($context->skiptitle);
        $context->arialabel = $bc->arialabel;
        $context->ariarole = !empty($bc->attributes['role']) ? $bc->attributes['role'] : 'complementary';
        $context->type = $bc->attributes['data-block'];
        $context->title = $bc->title;
        $context->content = $bc->content;
        $context->annotation = $bc->annotation;
        $context->footer = $bc->footer;
        $context->hascontrols = !empty($bc->controls);
        if ($context->hascontrols) {
            $context->controls = $this->block_controls($bc->controls, $id);
        }

        return $this->render_from_template('core/block', $context);
    }

    /**
     * Returns the CSS classes to apply to the body tag.
     *
     * @since Moodle 2.5.1 2.6
     * @param array $additionalclasses Any additional classes to apply.
     * @return string
     */
    public function body_css_classes(array $additionalclasses = array()) {
        return $this->page->bodyclasses;
    }

    /**
     * Renders preferences groups.
     *
     * @param  preferences_groups $renderable The renderable
     * @return string The output.
     */
    public function render_preferences_groups(preferences_groups $renderable) {
        return $this->render_from_template('core/preferences_groups', $renderable);
    }

    /**
     * Renders an action menu component.
     *
     * @param action_menu $menu
     * @return string HTML
     */
    public function render_action_menu(action_menu $menu) {

        // We don't want the class icon there!
        foreach ($menu->get_secondary_actions() as $action) {
            if ($action instanceof \action_menu_link && $action->has_class('icon')) {
                $action->attributes['class'] = preg_replace('/(^|\s+)icon(\s+|$)/i', '', $action->attributes['class']);
            }
        }

        $context = $menu->export_for_template($this);

        // We do not want the icon with the caret, the caret is added by Bootstrap.
        if (empty($context->primary->menutrigger)) {
            $newurl = $this->pix_url('t/edit', 'moodle');
            $context->primary->icon['attributes'] = array_reduce($context->primary->icon['attributes'],
                function($carry, $item) use ($newurl) {
                    if ($item['name'] === 'src') {
                        $item['value'] = $newurl->out(false);
                    }
                    $carry[] = $item;
                    return $carry;
                }, []
            );
        }

        return $this->render_from_template('core/action_menu', $context);
    }

    /**
     * Implementation of user image rendering.
     *
     * @param help_icon $helpicon A help icon instance
     * @return string HTML fragment
     */
    protected function render_help_icon(help_icon $helpicon) {
        $context = $helpicon->export_for_template($this);
        return $this->render_from_template('core/help_icon', $context);
    }

    /**
     * Renders a single button widget.
     *
     * This will return HTML to display a form containing a single button.
     *
     * @param single_button $button
     * @return string HTML fragment
     */
    protected function render_single_button(single_button $button) {
        return $this->render_from_template('core/single_button', $button->export_for_template($this));
    }

    /**
     * Renders a single select.
     *
     * @param single_select $select The object.
     * @return string HTML
     */
    protected function render_single_select(single_select $select) {
        return $this->render_from_template('core/single_select', $select->export_for_template($this));
    }

    /**
     * Renders a paging bar.
     *
     * @param paging_bar $pagingbar The object.
     * @return string HTML
     */
    protected function render_paging_bar(paging_bar $pagingbar) {
        // Any more than 10 is not usable and causes wierd wrapping of the pagination in this theme.
        $pagingbar->maxdisplay = 10;
        return $this->render_from_template('core/paging_bar', $pagingbar->export_for_template($this));
    }

    /**
     * Renders a url select.
     *
     * @param url_select $select The object.
     * @return string HTML
     */
    protected function render_url_select(url_select $select) {
        return $this->render_from_template('core/url_select', $select->export_for_template($this));
    }

    /**
     * Renders a pix_icon widget and returns the HTML to display it.
     *
     * @param pix_icon $icon
     * @return string HTML fragment
     */
    protected function render_pix_icon(pix_icon $icon) {
        $data = $icon->export_for_template($this);
        foreach ($data['attributes'] as $key => $item) {
            $name = $item['name'];
            $value = $item['value'];
            if ($name == 'class') {
                $data['extraclasses'] = $value;
                unset($data['attributes'][$key]);
                $data['attributes'] = array_values($data['attributes']);
                break;
            }
        }
        return $this->render_from_template('core/pix_icon', $data);
    }
}