<?php


namespace eftec\bladeone;


/**
 * trait BladeOneCacheRedis
 * Copyright (c) 2016 Jorge Patricio Castro Castillo MIT License. Don't delete this comment, its part of the license.
 * Extends the tags of the class BladeOne.  Its optional
 * It adds the next tags to the template
 * <code>
 * @ cache([cacheid],[duration=86400]).  The id is optional. The duration of the cache is in seconds
 * // content here
 * @ endcache()
 * </code>
 * It also adds a new function (optional) to the business or logic layer
 * <code>
 * if ($blade->cacheExpired('hellocache',1,5)) {   //'helloonecache' =template, =1 id cache, 5=duration (seconds)
 *    // cache expired, so we should do some stuff (such as read from the database)
 * }
 * </code>
 * @package  BladeOneCacheRedis
 * @version 0.1 2017-12-15 NOT YET IMPLEMENTED, ITS A WIP!!!!!!!!
 * @link https://github.com/EFTEC/BladeOne
 * @author   Jorge Patricio Castro Castillo <jcastro arroba eftec dot cl>
 */
const CACHEREDIS_SCOPEURL = 1;

trait BladeOneCacheRedis {

	var $curCacheId = 0;
	var $curCacheDuration = "";
	var $curCachePosition = 0;
	var $cacheRunning = false;
	private $cacheExpired = []; // avoids to compare the file different times.
	/** @var \Redis $redis */
	var $redis;
	var $redisIP = '127.0.0.1';
	var $redisPort = 6379;
	var $redisTimeOut = 2.5;
	var $redisConnected = false;
	var $redisNamespace = 'bladeonecache:';
	var $redisBase = 0;

	//<editor-fold desc="compile">
	public function compileCache( $expression ) {
		// get id of template
		// if the file exists then
		//     compare date.
		//     if the date is too old then re-save.
		// else
		// save for the first time.

		return $this->phpTag . "echo \$this->cacheStart{$expression}; if(!\$this->cacheRunning) { ?>";
	}

	public function compileEndCache( $expression ) {
		return $this->phpTag . "} // if cacheRunning\necho \$this->cacheEnd{$expression}; ?>";
	}

	//</editor-fold>


	public function connect( $redisIP = null, $redisPort = null, $redisTimeOut = null ) {
		if ( $this->redisConnected ) {
			return true;
		}
		if ( ! class_exists( 'Redis' ) ) {
			return false;
		} // it requires redis.
		if ( $redisIP !== null ) {
			$this->redisIP      = $redisIP;
			$this->redisPort    = $redisPort;
			$this->redisTimeOut = $redisTimeOut;
		}
		$this->redis          = new \Redis();
		$this->redisConnected = $this->redis->connect( $this->redisIP, $this->redisPort, $this->redisTimeOut ); // 2.5 sec timeout.

		return $this->redisConnected;
	}

	private function keyByScope( $scope ) {
		$key = '';
		if ( $scope && CACHEREDIS_SCOPEURL ) {
			$key .= $_SERVER['HTTP_HOST'] . $_SERVER['PHP_SELF'];
		}
	}

	/**
	 * Returns true if the cache expired (or doesn't exist), otherwise false.
	 *
	 * @param string $templateName name of the template to use (such hello for template hello.blade.php)
	 * @param string $id (id of cache, optional, if not id then it adds automatically a number)
	 * @param int $scope scope of the cache.
	 * @param int $cacheDuration (duration of the cache in seconds)
	 *
	 * @return bool (return if the cache expired)
	 */
	public function cacheExpired( $templateName, $id, $scope, $cacheDuration ) {
		if ( $this->getMode() & 1 ) {
			return true; // forced mode, hence it always expires. (fast mode is ignored).
		}


		$compiledFile = $this->getCompiledFile( $templateName ) . '_cache' . $id;
		if ( isset( $this->cacheExpired[ $compiledFile ] ) ) {
			// if the information is already in the array then returns it.
			return $this->cacheExpired[ $compiledFile ];
		}
		$date = @filemtime( $compiledFile );
		if ( $date ) {
			if ( $date + $cacheDuration < time() ) {
				$this->cacheExpired[ $compiledFile ] = true;

				return true; // time-out.
			}
		} else {
			$this->cacheExpired[ $compiledFile ] = true;

			return true; // no file
		}
		$this->cacheExpired[ $compiledFile ] = false;

		return false; // cache active.
	}

	public function cacheStart( $id = "", $cacheDuration = 86400 ) {

		$this->curCacheId       = ( $id == "" ) ? ( $this->curCacheId + 1 ) : $id;
		$this->curCacheDuration = $cacheDuration;
		$this->curCachePosition = strlen( ob_get_contents() );
		$compiledFile           = $this->getCompiledFile() . '_cache' . $this->curCacheId;
		if ( $this->cacheExpired( '', $id, $cacheDuration ) ) {
			$this->cacheRunning = false;
		} else {
			$this->cacheRunning = true;
			$content            = $this->getFile( $compiledFile );
			echo esc_html__( $content, ATKP_PLUGIN_PREFIX );
		}
		// getFile($fileName)
	}

	public function cacheEnd() {

		if ( ! $this->cacheRunning ) {
			$txt          = substr( ob_get_contents(), $this->curCachePosition );
			$compiledFile = $this->getCompiledFile() . '_cache' . $this->curCacheId;
			file_put_contents( $compiledFile, $txt );
		}
		$this->cacheRunning = false;
	}
}