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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/>.

/**
 * Theme functions.
 *
 * @package    theme_boost
 * @copyright  2016 Frédéric Massart - FMCorz.net
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

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

/**
 * Post process the CSS tree.
 *
 * @param string $tree The CSS tree.
 * @param theme_config $theme The theme config object.
 */
function theme_boost_css_tree_post_processor($tree, $theme) {
    $prefixer = new theme_boost\autoprefixer($tree);
    $prefixer->prefix();
}

/**
 * Inject additional SCSS.
 *
 * @param theme_config $theme The theme config object.
 * @return string
 */
function theme_boost_get_extra_scss($theme) {
    $content = '';
    $imageurl = $theme->setting_file_url('backgroundimage', 'backgroundimage');

// Sets the background image, and its settings.
    if (!empty($imageurl)) {
        $content .= 'body { ';
        $content .= "background-image: url('$imageurl'); background-size: cover;";
        $content .= ' }';
    }

// Always return the background image with the scss when we have it.
    return !empty($theme->settings->scss) ? $theme->settings->scss . ' ' . $content : $content;
}

/**
 * Serves any files associated with the theme settings.
 *
 * @param stdClass $course
 * @param stdClass $cm
 * @param context $context
 * @param string $filearea
 * @param array $args
 * @param bool $forcedownload
 * @param array $options
 * @return bool
 */
function theme_boost_pluginfile($course, $cm, $context, $filearea, $args, $forcedownload, array $options = array()) {
    if ($context->contextlevel == CONTEXT_SYSTEM && ($filearea === 'logo' || $filearea === 'backgroundimage')) {
        $theme = theme_config::load('boost');
        // By default, theme files must be cache-able by both browsers and proxies.
        if (!array_key_exists('cacheability', $options)) {
            $options['cacheability'] = 'public';
        }
        return $theme->setting_file_serve($filearea, $args, $forcedownload, $options);
    } else {
        send_file_not_found();
    }
}

/**
 * Returns the main SCSS content.
 *
 * @param theme_config $theme The theme config object.
 * @return string
 */
function theme_boost_get_main_scss_content($theme) {
    global $CFG;

$scss = '';
    $filename = !empty($theme->settings->preset) ? $theme->settings->preset : null;
    $fs = get_file_storage();

$context = context_system::instance();
    if ($filename == 'default.scss') {
        $scss .= file_get_contents($CFG->dirroot . '/theme/boost/scss/preset/default.scss');
    } else if ($filename == 'plain.scss') {
        $scss .= file_get_contents($CFG->dirroot . '/theme/boost/scss/preset/plain.scss');
    } else if ($filename && ($presetfile = $fs->get_file($context->id, 'theme_boost', 'preset', 0, '/', $filename))) {
        $scss .= $presetfile->get_content();
    } else {
        // Safety fallback - maybe new installs etc.
        $scss .= file_get_contents($CFG->dirroot . '/theme/boost/scss/preset/default.scss');
    }

return $scss;
}

/**
 * Get compiled css.
 *
 * @return string compiled css
 */
function theme_boost_get_precompiled_css() {
    global $CFG;
    return file_get_contents($CFG->dirroot . '/theme/boost/style/moodle.css');
}

/**
 * Get SCSS to prepend.
 *
 * @param theme_config $theme The theme config object.
 * @return array
 */
function theme_boost_get_pre_scss($theme) {
    global $CFG;

$scss = '';
    $configurable = [
        // Config key => [variableName, ...].
        'brandcolor' => ['primary'],
    ];

// Prepend variables first.
    foreach ($configurable as $configkey => $targets) {
        $value = isset($theme->settings->{$configkey}) ? $theme->settings->{$configkey} : null;
        if (empty($value)) {
            continue;
        }
        array_map(function($target) use (&$scss, $value) {
            $scss .= '$' . $target . ': ' . $value . ";\n";
        }, (array) $targets);
    }

// Prepend pre-scss.
    if (!empty($theme->settings->scsspre)) {
        $scss .= $theme->settings->scsspre;
    }

if (!empty($theme->settings->fontsize)) {
        $scss .= '$font-size-base: ' . (1 / 100 * $theme->settings->fontsize) . "rem !default;\n";
    }

return $scss;
}