<?php
if ( ! defined( 'ABSPATH' ) ) exit; // Exit if accessed directly

class autoptimizeCache {
	private $filename;
	private $mime;
	private $cachedir;
	private $delayed;
	
	public function __construct($md5,$ext='php') {
		$this->cachedir = AUTOPTIMIZE_CACHE_DIR;
		$this->delayed = AUTOPTIMIZE_CACHE_DELAY;
		$this->nogzip = AUTOPTIMIZE_CACHE_NOGZIP;
		if($this->nogzip == false) {
			$this->filename = AUTOPTIMIZE_CACHEFILE_PREFIX.$md5.'.php';
		} else {
			if (in_array($ext, array("js","css")))	 {
				$this->filename = $ext.'/'.AUTOPTIMIZE_CACHEFILE_PREFIX.$md5.'.'.$ext;
			} else {
				$this->filename = '/'.AUTOPTIMIZE_CACHEFILE_PREFIX.$md5.'.'.$ext;
			}
		}
	}
	
	public function check() {
		if(!file_exists($this->cachedir.$this->filename)) {
			// No cached file, sorry
			return false;
		}
		// Cache exists!
		return true;
	}
	
	public function retrieve() {
		if($this->check()) {
			if($this->nogzip == false) {
				return file_get_contents($this->cachedir.$this->filename.'.none');
			} else {
				return file_get_contents($this->cachedir.$this->filename);
			}
		}
		return false;
	}
	
	public function cache($code,$mime) {
		if($this->nogzip == false) {
			$file = ($this->delayed ? 'delayed.php' : 'default.php');
			$phpcode = file_get_contents(WP_PLUGIN_DIR.'/autoptimize/config/'.$file);
			$phpcode = str_replace(array('%%CONTENT%%','exit;'),array($mime,''),$phpcode);
			file_put_contents($this->cachedir.$this->filename,$phpcode);
			file_put_contents($this->cachedir.$this->filename.'.none',$code);
			if(!$this->delayed) {
				// Compress now!
				file_put_contents($this->cachedir.$this->filename.'.deflate',gzencode($code,9,FORCE_DEFLATE));
				file_put_contents($this->cachedir.$this->filename.'.gzip',gzencode($code,9,FORCE_GZIP));
			}
		} else {
			// Write code to cache without doing anything else
			file_put_contents($this->cachedir.$this->filename,$code);			
		}
	}
	
	public function getname() {
		return $this->filename;
	}
	
	static function clearall() {
		if(!autoptimizeCache::cacheavail()) {
			return false;
		}
	
		// scan the cachedirs		
		foreach (array("","js","css") as $scandirName) {
			$scan[$scandirName] = scandir(AUTOPTIMIZE_CACHE_DIR.$scandirName);
		}
		
		// clear the cachedirs
		foreach ($scan as $scandirName=>$scanneddir) {
			$thisAoCacheDir=rtrim(AUTOPTIMIZE_CACHE_DIR.$scandirName,"/")."/";
			foreach($scanneddir as $file) {
				if(!in_array($file,array('.','..')) && strpos($file,AUTOPTIMIZE_CACHEFILE_PREFIX) !== false && is_file($thisAoCacheDir.$file)) {
					@unlink($thisAoCacheDir.$file);
				}
			}
		}

		@unlink(AUTOPTIMIZE_CACHE_DIR."/.htaccess");
		
		// Do we need to clean any caching plugins cache-files?
		if(function_exists('wp_cache_clear_cache')) {
			if (is_multisite()) {
				$blog_id = get_current_blog_id();
                		wp_cache_clear_cache($blog_id);
			} else {
				wp_cache_clear_cache();
			}
		} else if ( function_exists('w3tc_pgcache_flush') ) {
			w3tc_pgcache_flush(); // w3 total cache
		} else if ( function_exists('hyper_cache_invalidate') ) {
			hyper_cache_invalidate(); // hypercache
		} else if ( function_exists('wp_fast_cache_bulk_delete_all') ) {
			wp_fast_cache_bulk_delete_all(); // wp fast cache
		} else if (class_exists("WpFastestCache")) {
                	$wpfc = new WpFastestCache(); // wp fastest cache
                	$wpfc -> deleteCache();
		} else if ( class_exists("c_ws_plugin__qcache_purging_routines") ) {
			c_ws_plugin__qcache_purging_routines::purge_cache_dir(); // quick cache
		} else if(file_exists(WP_CONTENT_DIR.'/wp-cache-config.php') && function_exists('prune_super_cache')){
			// fallback for WP-Super-Cache
			global $cache_path;
			if (is_multisite()) {
				$blog_id = get_current_blog_id();
                		prune_super_cache( get_supercache_dir( $blog_id ), true );
               			prune_super_cache( $cache_path . 'blogs/', true );
			} else {
				prune_super_cache($cache_path.'supercache/',true);
                		prune_super_cache($cache_path,true);
            		}
		} else {
			// fallback; schedule event and try to clear there
			wp_schedule_single_event( time() + 1, 'ao_flush_pagecache' , array(time()));
		}
		return true;
	}
	
	static function stats()	{
		// Cache not available :(
		if(!autoptimizeCache::cacheavail()) {
			return 0;
		}
		
		// Count cached info
		$count = 0;
		
		// scan the cachedirs		
		foreach (array("","js","css") as $scandirName) {
			$scan[$scandirName] = scandir(AUTOPTIMIZE_CACHE_DIR.$scandirName);
		}
		
		foreach ($scan as $scandirName=>$scanneddir) {
			$thisAoCacheDir=rtrim(AUTOPTIMIZE_CACHE_DIR.$scandirName,"/")."/";
			foreach($scanneddir as $file) {
				if(!in_array($file,array('.','..')) && strpos($file,'autoptimize') !== false) {
					if(is_file($thisAoCacheDir.$file)) {
						if(AUTOPTIMIZE_CACHE_NOGZIP && (strpos($file,'.js') !== false || strpos($file,'.css') !== false)) {
							$count++;
						} elseif(!AUTOPTIMIZE_CACHE_NOGZIP && strpos($file,'.none') !== false) {
							$count++;
						}
					}
				}
			}
		}
		
		// print the number of instances
		return $count;
	}
	
	static function cacheavail() {
		if(!defined('AUTOPTIMIZE_CACHE_DIR')) {
			// We didn't set a cache
			return false;
		}
		
		foreach (array("","js","css") as $checkDir) {
			if(!autoptimizeCache::checkCacheDir(AUTOPTIMIZE_CACHE_DIR.$checkDir)) {
				return false;
			}
		}
		
		/** write index.html here to avoid prying eyes */
		$indexFile=AUTOPTIMIZE_CACHE_DIR.'/index.html';
		if(!is_file($indexFile)) {
			@file_put_contents($indexFile,'<html><body>Generated by <a href="http://wordpress.org/extend/plugins/autoptimize/">Autoptimize</a></body></html>');
		}
                /** write .htaccess here to overrule wp_super_cache */
                $htAccess=AUTOPTIMIZE_CACHE_DIR.'/.htaccess';
                if(!is_file($htAccess)) {
                        if (is_multisite() || AUTOPTIMIZE_CACHE_NOGZIP == false) {

                                @file_put_contents($htAccess,'<IfModule mod_headers.c>
        Header set Vary "Accept-Encoding"
        Header set Cache-Control "max-age=10672000, must-revalidate"
</IfModule>
<IfModule mod_expires.c>
        ExpiresActive On
        ExpiresByType text/css A30672000
        ExpiresByType text/javascript A30672000
        ExpiresByType application/javascript A30672000
</IfModule>
<IfModule mod_deflate.c>
        <FilesMatch "\.(js|css)$">
        SetOutputFilter DEFLATE
    </FilesMatch>
</IfModule>
<IfModule mod_authz_core.c>
    <Files *.php>
        Require all granted
    </Files>
</IfModule>
<IfModule !mod_authz_core.c>
    <Files *.php>
        Order allow,deny
        Allow from all
    </Files>
</IfModule>');
			} else {
                        @file_put_contents($htAccess,'<IfModule mod_headers.c>
        Header set Vary "Accept-Encoding"
        Header set Cache-Control "max-age=10672000, must-revalidate"
</IfModule>
<IfModule mod_expires.c>
        ExpiresActive On
        ExpiresByType text/css A30672000
        ExpiresByType text/javascript A30672000
        ExpiresByType application/javascript A30672000
</IfModule>
<IfModule mod_deflate.c>
        <FilesMatch "\.(js|css)$">
        SetOutputFilter DEFLATE
    </FilesMatch>
</IfModule>
<IfModule mod_authz_core.c>
    <Files *.php>
        Require all denied
    </Files>
</IfModule>
<IfModule !mod_authz_core.c>
    <Files *.php>
        Order deny,allow
        Deny from all
    </Files>
</IfModule>');
                        }
                }
                // All OK
                return true;
	}

	static function checkCacheDir($dir) {
		// Check and create if not exists
		if(!file_exists($dir))	{
			@mkdir($dir,0775,true);
			if(!file_exists($dir))	{
				return false;
			}
		}

		// check if we can now write
		if(!is_writable($dir))	{
			return false;
		}

		// and write index.html here to avoid prying eyes
		$indexFile=$dir.'/index.html';
		if(!is_file($indexFile)) {
			@file_put_contents($indexFile,'<html><body>Generated by <a href="http://wordpress.org/extend/plugins/autoptimize/">Autoptimize</a></body></html>');
		}
		
		return true;
	}
}