<?php

class AppHelper extends Helper {
	public $_cache = array();
	public $_key = '';
	public $_criteria = array('prefix');
	public $_extras = array();
	public $_paramFields = array('controller', 'plugin', 'action', 'prefix');

	public function beforeRender() {
		if (is_a($this, 'HtmlHelper')) {
			$keys = array_intersect_key($this->params, array_combine($this->_criteria, $this->_criteria));
			$this->_key = 'url_map_' . implode('_', $keys);

			$this->_cache = Cache::read($this->_key, '_app_urls_');
			$this->_extras = array_intersect_key($this->params, array_combine($this->_paramFields, $this->_paramFields));
		}
	}

	public function afterLayout() {
		if (is_a($this, 'HtmlHelper')) {
			Cache::write($this->_key, $this->_cache, '_app_urls_');
		}
	}

	public function url($url = null, $full = false) {
		$keyUrl = $url;
		if (is_array($keyUrl)) {
			$keyUrl += $this->_extras;
			$keyUrl['full'] = $full;
		}

		$key = md5(serialize($keyUrl));
		if (!empty($this->_cache[$key])) {
			return $this->_cache[$key];
		}

		$url = parent::url($url, $full);
		$this->_cache[$key] = $url;

		return $url;
	}
}

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