<?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/>.

/**
 * Sets per-user styles (all the CSS declarations are here)            (1)
 *
 * This file is the cornerstone of the block - when the page loads, it
 * checks if the user has a custom settings for the font size and colour
 * scheme (either in the session or the database) and creates a stylesheet
 * to override the standard styles with this setting.                  (2)
 *
 * @see block_accessibility.php                                        (3)
 * @package   block_accessibility                                      (4)
 * @copyright Copyright 2009 onwards Taunton's College                   (5)
 * @author Mark Johnson <mark.johnson@tauntons.ac.uk>                  (6)
 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later (7)
 */

require_once('../../config.php');

// Including config.php overwrites header content-type in moodle 2.8.
header('Content-Type: text/css', true);
header("X-Content-Type-Options: nosniff"); // For IE.
header('Cache-Control: no-cache');

if (!isloggedin()) {
    die();
}

// Get block instance config data outside of it's class
// https://moodle.org/mod/forum/discuss.php?d=129799
// Also check configdata encoding in blocks/moodleblock.class.php.

$instanceid = required_param('instance_id', PARAM_INT);
$data = $DB->get_record('block_instances', array('id' => $instanceid), '*', MUST_EXIST);
$blockinstance = block_instance('accessibility', $data);


// Read user settings.
// First, check the session to see if the user's overridden the default/saved setting.
$options = $DB->get_record('block_accessibility', array('userid' => $USER->id));

// NOTE: User settings priority: 1. $USER session, 2. database
// check for fontsize user setting.
if (!empty($USER->fontsize)) {
    $fontsize = $USER->fontsize;
} else {
    if (!empty($options->fontsize)) {
        $fontsize = $options->fontsize;
    }
}

// Check for colourscheme user setting.
if (!empty($USER->colourscheme)) {
    $colourscheme = $USER->colourscheme;
} else {
    if (!empty($options->colourscheme)) {
        $colourscheme = $options->colourscheme;
    }
}

// Font size CSS declarations.
// Echo out CSS for the body element. Use !important to override any other external stylesheets.
if (!empty($fontsize)) {
    echo '

	#page { /* block elements */
		font-size: ' . $fontsize . '% !important;
		line-height:1.5; /*WCAG 2.0*/
	}

	#page *{
		line-height: inherit !important;
		font-size: inherit !important;
	}


	/* issue #74 - default h* sizes from Moodle CSS */
	#page #page-header h1, #page #region-main h1{font-size:' . (0.32 * $fontsize) . 'px !important}
	#page #page-header h2, #page #region-main h2{font-size:' . (0.28 * $fontsize) . 'px !important}
	#page #page-header h3, #page #region-main h3{font-size:' . (0.24 * $fontsize) . 'px !important}
	#page #page-header h4, #page #region-main h4{font-size:' . (0.20 * $fontsize) . 'px !important}
	#page #page-header h5, #page #region-main h5{font-size:' . (0.16 * $fontsize) . 'px !important}
	#page #page-header h6, #page #region-main h6{font-size:' . (0.12 * $fontsize) . 'px !important}
	';
}

// Color schemes CSS declarations.
// So far, selector * is used. This might cause some problems.
// Idea: Maybe better solution is to apply backgrounds to specific elements like body, .header, ...

if (!empty($colourscheme)) {
    // If $colourscheme == 1, reset, so don't output any styles.
    if ($colourscheme > 1 && $colourscheme < 5) { // This is how many declarations we defined in edit_form.php.
        if ($blockinstance->config !== null) {
            $fgcolour = $blockinstance->config->{'fg' . $colourscheme};
            $bgcolour = $blockinstance->config->{'bg' . $colourscheme};
        } else { // Block has never been configured, load default colours.
            require_once($CFG->dirroot . '/blocks/accessibility/defaults.php');
            $fgcolour = $defaults['fg' . $colourscheme];
            $bgcolour = $defaults['bg' . $colourscheme];
        }

    }

    // Keep in mind that :not selector cannot work properly with IE <= 8 so this will not be included.
    $notselector = '';
    if (!preg_match('/(?i)msie [1-8]/', $_SERVER['HTTP_USER_AGENT'])) {
        $notselector = ':not([class*="mce"]):not([id*="mce"]):not([id*="editor"])';
    }

    // If no colours defined, no output, it will remain as default.
    if (!empty($bgcolour)) {
        echo '
		forumpost .topic {
			background-image: none !important;
		}
		*' . $notselector . '{
			/* it works well only with * selector but mce editor gets unusable */
			background-color: ' . $bgcolour . ' !important;
			background-image: none !important;
			text-shadow:none !important;
		}
		';
    }

    // It is recommended not to change forground colour.
    if (!empty($fgcolour)) {
        echo '
		*' . $notselector . '{
			/* it works well only with * selector but mce editor gets unusable */
			color: ' . $fgcolour . ' !important;
		}
		#content a, .tabrow0 span {
			color: ' . $fgcolour . ' !important;
		}
		.tabrow0 span:hover {
			text-decoration: underline;
		}
		.block_accessibility .outer {
			border-color: ' . $bgcolour . ' !important;
		}
		';
    }

}

// Accessibility block's colour scheme buttons.
// Do not edit (this part of code is not in styles.php because colours are defined in block's configuration form).
for ($i = 2; $i < 5; $i++) {  // This is how many declarations we defined in defaults.php.
    $colourscheme = $i;
    if ($blockinstance->config !== null) {
        $fgcolour = $blockinstance->config->{'fg' . $colourscheme};
        $bgcolour = $blockinstance->config->{'bg' . $colourscheme};
    } else { // Block has never been configured, load default colours.
        require_once($CFG->dirroot . '/blocks/accessibility/defaults.php');
        $fgcolour = $defaults['fg' . $colourscheme];
        $bgcolour = $defaults['bg' . $colourscheme];
    }
    echo '#block_accessibility_colour' . $colourscheme . '{';
    if (!empty($fgcolour)) {
        echo 'color:' . $fgcolour . ' !important;';
    }
    if (!empty($bgcolour)) {
        echo 'background-color:' . $bgcolour . ' !important;';
    }
    echo '}';
}

// The display:inline-block CSS declaration is not applied to block's buttons because IE7 doesn't support it.
// Float is used insted for IE7 only.
if (preg_match('/(?i)msie [1-7]/', $_SERVER['HTTP_USER_AGENT'])) {
    echo '#accessibility_controls .access-button{float:left;}';
    echo '.atbar-always{float:left;}';
}