<?php

/**
 *
 * @copyright  2010-2017 izend.org
 * @version    13
 * @link       http://www.izend.org
 */

function head($type=false) {
	static $head = array(
		'javascripts' => array(
			array('name' => 'jquery'),
		),
		'stylesheets' => array(
			array('name' => 'content', 'media' => 'screen'),
		),
	);

	if (!$type) {
		return $head;
	}

	$args=func_get_args();
	array_shift($args);

	switch ($type) {
		case 'lang':
			$head['lang'] = $args[0];
			break;
		case 'title':
			$head['title'] = $args[0];
			break;
		case 'description':
			$head['description'] = $args[0];
			break;
		case 'image':
			$head['image'] = $args[0];
			break;
		case 'canonical':
			$head['canonical'] = $args[0];
			break;
		case 'favicon':
			$head['favicon'] = $args[0];
			break;
		case 'keywords':
			$head['keywords'] = $args[0];
			break;
		case 'author':
			$head['author'] = $args[0];
			break;
		case 'date':
			$head['date'] = $args[0];
			break;
		case 'robots':
			$head['robots'] = $args[0];
			break;
		case 'theme':
			$head['theme'] = $args[0];
			break;
		case 'fontawesome':
			$head['fontawesome'] = true;
			break;
		case 'font':
			$fname=$args[0];
			if (!isset($head['fonts'])) {
				$head['fonts'] = array($fname);
			}
			else {
				if (!in_array($fname, $head['fonts'])) {
					$head['fonts'][]=$fname;
				}
			}
			break;
		case 'style':
			$s=$args[0];
			$media=isset($args[1]) ? $args[1] : 'all';
			if (!isset($head['style'])) {
				$head['style'] = array($media => $s);
			}
			else if (!isset($head['style'][$media])) {
				$head['style'][$media] = $s;
			}
			else {
				$head['style'][$media] .= PHP_EOL . PHP_EOL . $s;
			}
			break;
		case 'stylesheet':
			$name=$args[0];
			$media=isset($args[1]) ? $args[1] : 'all';
			if (!isset($head['stylesheets'])) {
				$head['stylesheets'] = array(compact('name', 'media'));
			}
			else {
				foreach ($head['stylesheets'] as $css) {
					if ($css['name'] == $name) {
						break 2;
					}
				}
				$head['stylesheets'][]=compact('name', 'media');
			}
			break;
		case 'script':
			$s=$args[0];
			if (!isset($head['script'])) {
				$head['script'] = $s;
			}
			else {
				$head['script'] .= PHP_EOL . PHP_EOL . $s;
			}
			break;
		case 'javascript':
			$name=$args[0];
			$param=isset($args[1]) ? $args[1] : false;
			if (!isset($head['javascripts'])) {
				$head['javascripts'] = array(param ? compact('name', 'param') : compact('name'));
			}
			else {
				foreach ($head['javascripts'] as $js) {
					if ($js['name'] == $name) {
						break 2;
					}
				}
				$head['javascripts'][]=$param ? compact('name', 'param') : compact('name');
			}
			break;
		case 'hreflang':
			if (!isset($head['hreflang'])) {
				$head['hreflang'] = array($args[0] => $args[1]);
			}
			else {
				$head['hreflang'][$args[0]] = $args[1];
			}
			break;
		default:
			return false;
	}

	return true;
}