<?php
App::uses('Helper', 'View');
App::uses('Router', 'Routing');
App::uses('UrlCacheManager', 'Tools.Routing');

/**
 * Helper enhancements for CakePHP
 *
 * @author Mark Scherer
 * @license MIT
 */
class MyHelper extends Helper {

	public function __construct($View = null, $settings = array()) {
		if (class_exists('Packages')) {
			Packages::initialize($this, __CLASS__);
		}
		parent::__construct($View, $settings);
	}

	/**
	 * Manually load helpers
	 *
	 * @param array $helpers (either strings, or [string => array(config...)])
	 * @param boolean $callbacks - trigger missed callbacks
	 * @return void
	 */
	public function loadHelpers($helpers = array(), $callbacks = false) {
		foreach ((array)$helpers as $helper => $config) {
			if (is_int($helper)) {
				$helper = $config;
				$config = array();
			}
			list($plugin, $helperName) = pluginSplit($helper, true);
			if (isset($this->{$helperName})) {
				continue;
			}
			App::uses($helperName . 'Helper', $plugin . 'View/Helper');
			$helperFullName = $helperName . 'Helper';
			$this->{$helperName} = new $helperFullName($this->_View, (array)$config);

			if ($callbacks) {
				if (method_exists($helper, 'beforeRender')) {
					$this->{$helperName}->beforeRender();
				}
			}
		}
	}

	/**
	 * //TODO: remove
	 * Not a very good solution, as it takes a lot of resources, file lookups.
	 *
	 * Problems: what if inside plugin webroot? not easy to do...
	 */
	public function imageIfExists($path, $options = array(), $default = '---') {
		if (startsWith($path, '/')) {
			/*
			$completePath = Router::url($path);
			//echo (returns(file_exists($completePath)));
			//die($completePath);
			# problem with plugin files!!! needs "webroot" added after plugin name
			if (!file_exists($completePath)) {
				return $default;
			}
			*/
		} else {
			$completePath = Router::url($path);
		}
		if (!empty($completePath) && !file_exists($completePath)) {
			return $default;
		}
		return $this->image($path, $options);
	}

	/**
	 * Display image tag from blob content.
	 * Enhancement for HtmlHelper. Defaults to png image
	 *
	 * Options:
	 * - type: png, gif, jpg, ...
	 *
	 * @param binary $content
	 * @param array $options
	 * @return string html imageTag
	 */
	public function imageFromBlob($content, $options = array()) {
		$options += array('type' => 'png');
		$mimeType = 'image/' . $options['type'];

		$text = 'data:' . $mimeType . ';base64,' . base64_encode($content);
		return sprintf($this->_tags['image'], $text, $this->_parseAttributes($options, null, '', ' '));
	}

	/**
	 * HTML Helper extension for HTML5 time
	 * The time element represents either a time on a 24 hour clock,
	 * or a precise date in the proleptic Gregorian calendar,
	 * optionally with a time and a time-zone offset.
	 *
	 * Options:
	 * - 'format' STRING: Use the specified TimeHelper method (or format()).
	 *   FALSE: Generate the datetime. NULL: Do nothing.
	 * - 'datetime' STRING: If 'format' is STRING use as the formatting string.
	 *   FALSE: Don't generate attribute
	 *
	 * @param $content string Time
	 * @param $options array Options
	 * @return string HTML time tag.
	 */
	public function time($content, $options = array()) {
		if (!isset($this->tags['time'])) {
			$this->tags['time'] = '<time%s>%s</time>';
		}
		$options = array_merge(array(
			'datetime' => '%Y-%m-%d %T',
			'pubdate' => false,
			'format' => '%Y-%m-%d %T',
		), $options);

		if ($options['format'] !== null) {
			if (!isset($this->Time)) {
				App::uses('TimeHelper', 'View/Helper');
				$this->Time = new TimeHelper($this->_View);
			}
		}
		if ($options['format']) {
			if (method_exists($this->Time, $options['format'])) {
				$content = $this->Time->$options['format']($content);
			} else {
				$content = $this->Time->i18nFormat($content, $options['format']);
			}
			$options['datetime'] = $this->Time->i18nFormat(strtotime($content), $options['datetime']);
		} elseif ($options['format'] === false && $options['datetime']) {
			$options['datetime'] = $this->Time->i18nFormat(strtotime($content), $options['datetime']);
		}

		if ($options['pubdate']) {
			$pubdate = true;
		}
		unset($options['format']);
		unset($options['pubdate']);
		$attributes = $this->_parseAttributes($options, array(0), ' ', '');

		if (isset($pubdate)) {
			$attributes .= ' pubdate';
		}
		return sprintf($this->tags['time'], $attributes, $content);
	}

	/**
	 * For convenience functions Html::defaultLink() and defaultUrl().
	 *
	 * @var array
	 */
	protected $_linkDefaults = null;

	/**
	 * Keep named and query params for pagination/filter after edit etc.
	 *
	 * @params same as Html::link($title, $url, $options, $confirmMessage)
	 * @return string Link
	 */
	public function completeLink($title, $url = null, $options = array(), $confirmMessage = false) {
		// Named are deprecated
		if (is_array($url)) {
			$url += $this->params['named'];
		}
		if (is_array($url)) {
			if (!isset($url['?'])) {
				$url['?'] = array();
			}
			$url['?'] += $this->request->query;
		}
		return $this->link($title, $url, $options, $confirmMessage);
	}

	/**
	 * Keep named and query params for pagination/filter after edit etc.
	 *
	 * @params same as Html::url($url, $options, $escape)
	 * @return string Link
	 */
	public function completeUrl($url = null, $full = false, $escape = true) {
		// Named are deprecated
		if (is_array($url)) {
			$url += $this->params['named'];
		}
		if (is_array($url)) {
			if (!isset($url['?'])) {
				$url['?'] = array();
			}
			$url['?'] += $this->request->query;
		}
		return $this->url($url, $options, $escape);
	}

	/**
	 * Convenience function for normal links.
	 * Useful for layout links and links inside elements etc if you don't want to
	 * verbosely reset all parts of it (prefix, plugin, ...).
	 *
	 * @params same as Html::link($title, $url, $options, $confirmMessage)
	 * @return string HTML Link
	 */
	public function defaultLink($title, $url = null, $options = array(), $confirmMessage = false) {
		if ($this->_linkDefaults === null) {
			if (!class_exists('CommonComponent')) {
				App::uses('CommonComponent', 'Tools.Controller/Component');
			}
			$this->_linkDefaults = CommonComponent::defaultUrlParams();
		}
		if (!defined('PREFIX_ADMIN')) {
			define('PREFIX_ADMIN', 'admin');
		}
		if ($url !== null && is_array($url)) {
			$url = array_merge($this->_linkDefaults, $url);
			if (!empty($url[PREFIX_ADMIN])) {
				$options['rel'] = 'nofollow';
			}
		} elseif (is_array($title)) {
			$title = array_merge($this->_linkDefaults, $title);
			if (!empty($title[PREFIX_ADMIN])) {
				$options['rel'] = 'nofollow';
			}
		}
		//$this->log($url, '404');
		return $this->link($title, $url, $options, $confirmMessage);
	}

	/**
	 * Convenience function for normal urls.
	 * Useful for layout links and links inside elements etc if you don't want to
	 * verbosely reset all parts of it (prefix, plugin, ...).
	 *
	 * @params same as Html::url($url, $full)
	 * @return string URL
	 */
	public function defaultUrl($url = null, $full = false) {
		if ($this->_linkDefaults === null) {
			if (!class_exists('CommonComponent')) {
				App::uses('CommonComponent', 'Tools.Controller/Component');
			}
			$this->_linkDefaults = CommonComponent::defaultUrlParams();
		}
		if ($url !== null && is_array($url)) {
			$url = array_merge($this->_linkDefaults, $url);
		}
		return $this->url($url, $full);
	}

	/**
	 * Enhancement to htmlHelper which allows the crumbs protected array
	 * to be cleared so that more than one set of crumbs can be generated in the same view.
	 *
	 * @return void
	 */
	public function resetCrumbs() {
		$this->_crumbs = array();
	}

	/**
	 * This function is responsible for setting up the Url cache before the application starts generating urls in views
	 *
	 * @return void
	 */
	public function beforeRender($viewFile) {
		if (!Configure::read('UrlCache.active') || Configure::read('UrlCache.runtime.beforeRender')) {
			return;
		}

		# todo: maybe lazy load with HtmlHelper::url()?
		UrlCacheManager::init($this->_View);
		Configure::write('UrlCache.runtime.beforeRender', true);
	}

	/**
	 * This method will store the current generated urls into a persistent cache for next use
	 *
	 * @return void
	 */
	public function afterLayout($layoutFile) {
		if (!Configure::read('UrlCache.active') || Configure::read('UrlCache.runtime.afterLayout')) {
			return;
		}

		UrlCacheManager::finalize();
		Configure::write('UrlCache.runtime.afterLayout', true);
	}

	/**
	 * Intercepts the parent url function to first look if the cache was already generated for the same params
	 *
	 * @param mixed $url url to generate using cakephp array syntax
	 * @param boolean|array $full whether to generate a full url or not (http scheme). As array: full, escape.
	 * @return string
	 * @see Helper::url()
	 */
	public function url($url = null, $full = false) {
		if (is_array($full)) {
			$escape = isset($full['ecape']) ? $full['escape'] : true;
			$full = isset($full['full']) ? $full['full'] : false;
		} else {
			$escape = true;
		}

		if (Configure::read('UrlCache.active')) {
			if ($cachedUrl = UrlCacheManager::get($url, $full)) {
				return $cachedUrl;
			}
		}
		if (!$escape) {
			$routerUrl = Router::url($url, $full);
		} else {
			$routerUrl = parent::url($url, $full);
		}
		if (Configure::read('UrlCache.active')) {
			UrlCacheManager::set($routerUrl);
		}
		return $routerUrl;
	}

}