<?php

namespace Zotlabs\Render;

use App;
use Zotlabs\Lib\PConfig;

class Theme {

	static $system_theme = null;

	static $session_theme = null;

	/**
	 * @brief Array with base or fallback themes.
	 */
	static $base_themes = array('redbasic');


	/**
	 * @brief Figure out the best matching theme and return it.
	 *
	 * The theme will depend on channel settings, mobile, session, core compatibility, etc.
	 *
	 * @return array
	 */
	static public function current() {

		self::$system_theme = ((isset(App::$config['system']['theme']))
			? App::$config['system']['theme'] : '');
		self::$session_theme = ((isset($_SESSION) && x($_SESSION, 'theme'))
			? $_SESSION['theme'] : self::$system_theme);

		$page_theme = null;

		// Find the theme that belongs to the channel whose stuff we are looking at

		if(App::$profile_uid) {
			$r = q("select channel_theme from channel where channel_id = %d limit 1",
				intval(App::$profile_uid)
			);
			if($r) {
				$page_theme = $r[0]['channel_theme'];
			}
		}

		// Themes from Comanche layouts over-ride the channel theme

		if(array_key_exists('theme', App::$layout) && App::$layout['theme']) {
			$page_theme = App::$layout['theme'];
		}

		$chosen_theme = self::$session_theme;

		if($page_theme) {
			$chosen_theme = $page_theme;
		}

		if(array_key_exists('theme_preview', $_GET))
			$chosen_theme = $_GET['theme_preview'];

		// Allow theme selection of the form 'theme_name:schema_name'
		$themepair = explode(':', $chosen_theme);
		// Check if $chosen_theme is compatible with core. If not fall back to default
		$info = get_theme_info($themepair[0]);

		$compatible = check_plugin_versions($info);
		if(!$compatible) {
			$chosen_theme = '';
		}

		App::$theme_info = $info;

		if($chosen_theme && (file_exists('view/theme/' . $themepair[0] . '/css/style.css') || file_exists('view/theme/' . $themepair[0] . '/php/style.php'))) {
			return($themepair);
		}

		foreach(self::$base_themes as $t) {
			if(file_exists('view/theme/' . $t . '/css/style.css') ||
				file_exists('view/theme/' . $t . '/php/style.php')) {
					return(array($t));
			}
		}

		// Worst case scenario, the default base theme or themes don't exist; perhaps somebody renamed it/them.

		// Find any theme at all and use it.

		$fallback = array_merge(glob('view/theme/*/css/style.css'), glob('view/theme/*/php/style.php'));
		if(count($fallback))
			return(array(str_replace('view/theme/', '', substr($fallback[0], 0, -14))));
	}


	/**
	 * @brief Return full URL to theme which is currently in effect.
	 *
	 * Provide a sane default if nothing is chosen or the specified theme does not exist.
	 *
	 * @return string
	 */
	static public function url() {

		$uid = App::$profile_uid ?: local_channel();

		$theme = self::current();

		$t = $theme[0];
		$s = ((count($theme) > 1) ? $theme[1] : '');

		$opts = '';
		$opts = (($uid) ? '?puid=' . $uid : '');

		$schema_str = ((x(App::$layout,'schema')) ? '&schema=' . App::$layout['schema'] : '');
		if(($s) && (! $schema_str))
			$schema_str = '&schema=' . $s;

		$opts .= $schema_str;

		if ($uid) {
			$timestamp = PConfig::Get($uid, 'system', 'style_update', false);
			if ($timestamp) {
				$opts .= '&updt=' . $timestamp;
			}
		}

		if(file_exists('view/theme/' . $t . '/php/style.php'))
			return('/view/theme/' . $t . '/php/style.css' . $opts);

		return('/view/theme/' . $t . '/css/style.css');
	}

	function debug() {
		logger('system_theme: ' . self::$system_theme);
		logger('session_theme: ' . self::$session_theme);
	}

}