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<?php

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namespace Nextend\Framework\Cache;

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use DateTime;

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class CacheImage extends AbstractCache {

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protected $_storageEngine = 'filesystem';

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protected $lazy = false;

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public function __construct($group) {

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parent::__construct($group, true);

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}

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protected function getScope() {

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return 'image';

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}

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public function setLazy($lazy) {

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$this->lazy = $lazy;

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}

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/**

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* @param $fileExtension

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* @param callable $callable

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* @param array $parameters

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* @param bool $hash

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* @return mixed

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public function makeCache($fileExtension, $callable, $parameters = array(), $hash = false) {

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if (!$hash) {

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$hash = $this->generateHash($fileExtension, $callable, $parameters);

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}

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if (strpos($parameters[1], '?') !== false) {

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$fileNameParts = explode('?', $parameters[1]);

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$keepFileName = pathinfo($fileNameParts[0], PATHINFO_FILENAME);

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} else {

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$keepFileName = pathinfo($parameters[1], PATHINFO_FILENAME);

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}

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$fileName = $hash . (!empty($keepFileName) ? '/' . $keepFileName : '');

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$fileNameWithExtension = $fileName . '.' . $fileExtension;

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$isCached = $this->exists($fileNameWithExtension);

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if ($isCached) {

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if (!$this->testManifestFile($fileName, $parameters[1])) {

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$isCached = false;

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}

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}

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if (!$isCached) {

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if ($this->lazy) {

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return $parameters[1];

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}

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array_unshift($parameters, $this->getPath($fileNameWithExtension));

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call_user_func_array($callable, $parameters);

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$this->createManifestFile($fileName, $parameters[2]);

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}

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return $this->getPath($fileNameWithExtension);

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}

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private function generateHash($fileExtension, $callable, $parameters) {

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return md5(json_encode(array(

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$fileExtension,

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$callable,

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$parameters

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)));

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}

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protected function testManifestFile($fileName, $originalFile) {

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$manifestKey = $this->getManifestKey($fileName);

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if ($this->exists($manifestKey)) {

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$manifestData = json_decode($this->get($manifestKey), true);

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$newManifestData = $this->getManifestData($originalFile);

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if ($manifestData['mtime'] == $newManifestData['mtime']) {

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return true;

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}

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} else {

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// Backward compatibility

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$this->createManifestFile($fileName, $originalFile);

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return true;

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}

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return false;

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}

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protected function createManifestFile($fileName, $originalFile) {

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$this->set($this->getManifestKey($fileName), json_encode($this->getManifestData($originalFile)));

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}

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private function getManifestData($originalFile) {

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$manifestData = array();

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if (strpos($originalFile, '//') !== false) {

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$manifestData['mtime'] = $this->getRemoteMTime($originalFile);

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} else {

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$manifestData['mtime'] = filemtime($originalFile);

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}

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return $manifestData;

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}

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private function getRemoteMTime($url) {

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if (ini_get('allow_url_fopen')) {

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$h = get_headers($url, 1);

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if (is_array($h) && strpos($h[0], '200') !== false) {

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foreach ($h as $k => $v) {

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if (strtolower(trim($k)) == "last-modified") {

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return (new DateTime($v))->getTimestamp();

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}

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}

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}

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}

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return 0;

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}

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protected function getManifestKey($fileName) {

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return $fileName . '.manifest';

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}

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}

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