<?php
/**
 * Implementation of view class
 *
 * @category   DMS
 * @package    SeedDMS
 * @license    GPL 2
 * @version    @version@
 * @author     Uwe Steinmann <uwe@steinmann.cx>
 * @copyright  Copyright (C) 2002-2005 Markus Westphal,
 *             2006-2008 Malcolm Cowe, 2010 Matteo Lucarelli,
 *             2010-2012 Uwe Steinmann
 * @version    Release: @package_version@
 */

require_once "inc.ClassHook.php";

/**
 * Parent class for all view classes
 *
 * @category   DMS
 * @package    SeedDMS
 * @author     Markus Westphal, Malcolm Cowe, Uwe Steinmann <uwe@steinmann.cx>
 * @copyright  Copyright (C) 2002-2005 Markus Westphal,
 *             2006-2008 Malcolm Cowe, 2010 Matteo Lucarelli,
 *             2010-2012 Uwe Steinmann
 * @version    Release: @package_version@
 */
class SeedDMS_View_Common {
	protected $theme;

	protected $params;

	protected $baseurl;

	protected $imgpath;

	public function __construct($params, $theme='bootstrap') {
		$this->theme = $theme;
		$this->params = $params;
		$this->baseurl = '';
		$this->imgpath = '../views/'.$theme.'/images/';
	}

	public function __invoke($get=array()) {
		$this->callHook('preRun', isset($get['action']) ? $get['action'] : 'show');
		if(isset($get['action']) && $get['action']) {
			if(method_exists($this, $get['action'])) {
				$this->{$get['action']}();
			} else {
				echo "Missing action '".htmlspecialchars($get['action'])."'";
			}
		} else
			$this->show();
		$this->callHook('postRun', isset($get['action']) ? $get['action'] : 'show');
	}

	public function setParams($params) {
		$this->params = $params;
	}

	public function setParam($name, $value) {
		$this->params[$name] = $value;
	}

	public function getParam($name) {
		if(isset($this->params[$name]))
			return $this->params[$name];
		return null;
	}

	/**
	 * Check if the view has a parameter with the given name
	 *
	 * @param string $name name of parameter
	 * @return boolean true if parameter exists otherwise false
	 */
	function hasParam($name) {
		return isset($this->params[$name]) ? true : false;
	}

	public function unsetParam($name) {
		if(isset($this->params[$name]))
			unset($this->params[$name]);
	}

	public function setBaseUrl($baseurl) {
		$this->baseurl = $baseurl;
	}

	public function show() {
	}

	/**
	 * Call a hook with a given name
	 *
	 * Checks if a hook with the given name and for the current view
	 * exists and executes it. The name of the current view is taken
	 * from the current class name by lower casing the first char.
	 * This function will execute all registered hooks in the order
	 * they were registered.
	 *
	 * Attention: as func_get_arg() cannot handle references passed to the hook,
	 * callHook() should not be called if that is required. In that case get
	 * a list of hook objects with getHookObjects() and call the hooks yourself.
	 *
	 * @params string $hook name of hook
	 * @return string concatenated string, merged arrays or whatever the hook
	 * function returns
	 */
	public function callHook($hook) { /* {{{ */
		$tmps = array();
		$tmp = explode('_', get_class($this));
		$tmps[] = $tmp[2];
		$tmp = explode('_', get_parent_class($this));
		$tmps[] = $tmp[2];
		/* Run array_unique() in case the parent class has the same suffix */
		$tmps = array_unique($tmps);
		$ret = null;
		foreach($tmps as $tmp)
		if(isset($GLOBALS['SEEDDMS_HOOKS']['view'][lcfirst($tmp)])) {
			foreach($GLOBALS['SEEDDMS_HOOKS']['view'][lcfirst($tmp)] as $hookObj) {
				if (method_exists($hookObj, $hook)) {
					switch(func_num_args()) {
						case 1:
							$tmpret = $hookObj->$hook($this);
							break;
						case 2:
							$tmpret = $hookObj->$hook($this, func_get_arg(1));
							break;
						case 3:
							$tmpret = $hookObj->$hook($this, func_get_arg(1), func_get_arg(2));
							break;
						case 4:
							$tmpret = $hookObj->$hook($this, func_get_arg(1), func_get_arg(2), func_get_arg(3));
							break;
						default:
						case 5:
							$tmpret = $hookObj->$hook($this, func_get_arg(1), func_get_arg(2), func_get_arg(3), func_get_arg(4));
							break;
					}
					if($tmpret !== null) {
						if(is_string($tmpret)) {
							$ret = ($ret === null) ? $tmpret : (is_string($ret) ? $ret.$tmpret : array_merge($ret, array($tmpret)));
						} elseif(is_array($tmpret) || is_object($tmpret)) {
							$ret = ($ret === null) ? $tmpret : (is_string($ret) ? array_merge(array($ret), $tmpret) : array_merge($ret, $tmpret));
						} else
							$ret = $tmpret;
					}
				}
			}
		}
		return $ret;
	} /* }}} */

	/**
	 * Return all hook objects for the given or calling class
	 *
	 * <code>
	 * <?php
	 * $hookObjs = $this->getHookObjects();
	 * foreach($hookObjs as $hookObj) {
	 *   if (method_exists($hookObj, $hook)) {
	 *     $ret = $hookObj->$hook($this, ...);
	 *     ...
	 *   }
	 * }
	 * ?>
	 * </code>
	 *
	 * @params string $classname name of class (current class if left empty)
	 * @return array list of hook objects registered for the class
	 */
	public function getHookObjects($classname='') { /* {{{ */
		if($classname)
			$tmp = explode('_', $classname);
		else
			$tmp = explode('_', get_class($this));
		if(isset($GLOBALS['SEEDDMS_HOOKS']['view'][lcfirst($tmp[2])])) {
			return $GLOBALS['SEEDDMS_HOOKS']['view'][lcfirst($tmp[2])];
		}
		return array();
	} /* }}} */

	/**
	 * Check if a hook is registered
	 *
	 * @param $hook string name of hook
	 * @return mixed false if one of the hooks fails,
	 *               true if all hooks succedded,
	 *               null if no hook was called
	 */
	public function hasHook($hook) { /* {{{ */
		$tmps = array();
		$tmp = explode('_', get_class($this));
		$tmps[] = $tmp[2];
		$tmp = explode('_', get_parent_class($this));
		$tmps[] = $tmp[2];
		/* Run array_unique() in case the parent class has the same suffix */
		$tmps = array_unique($tmps);
		$ret = null;
		foreach($tmps as $tmp) {
			if(isset($GLOBALS['SEEDDMS_HOOKS']['view'][lcfirst($tmp)])) {
				foreach($GLOBALS['SEEDDMS_HOOKS']['view'][lcfirst($tmp)] as $hookObj) {
					if (method_exists($hookObj, $hook)) {
						return true;
					}
				}
			}
		}
		return false;
	} /* }}} */

	/**
	 * Check if the access on the view with given name or the current view itself
	 * may be accessed.
	 *
	 * The function requires the parameter 'accessobject' to be available in the
	 * view, because it calls SeedDMS_AccessOperation::check_view_access()
	 * to check access rights. If the the optional $name is not set the
	 * current view is used.
	 *
	 * If $name is an array then just one of the passed objects in the array
	 * must be accessible for this function to return true.
	 *
	 * @param string|array $name name of view or list of view names
	 * @return boolean true if access is allowed otherwise false
	 */
	protected function check_access($name='') { /* {{{ */
		if(!$name)
			$name = $this;
		if(!isset($this->params['accessobject']))
			return false;
		$access = $this->params['accessobject']->check_view_access($name);
		return $access;

		if(isset($this->params['user']) && $this->params['user']->isAdmin()) {
			if($access === -1)
				return false;
			else
				return true;
		}

		return ($access === 1);
	} /* }}} */

	/**
	 * Create an url to a view
	 *
	 * @param string $name name of view
	 * @param array $urlparams list of url parameters
	 * @return string $url
	 */
	protected function html_url($view='', $urlparams) { /* {{{ */
		$url = "../out/out.".$view.".php";
		if($urlparams)
			$url .= "?".http_build_query($urlparams);
		return $url;
	} /* }}} */

	/**
	 * Create a html link to a view
	 *
	 * First checks if the view may be accessed by the user
	 *
	 * @param string $name name of view
	 * @param array $urlparams list of url parameters
	 * @param array $linkparams list of link attributes (e.g. class, target)
	 * @param string $link the link text itself
	 * @param boolean $hsc set to false if htmlspecialchars() shall not be called
	 * @return string link
	 */
	protected function html_link($view='', $urlparams=array(), $linkparams=array(), $link, $hsc=true, $nocheck=false) { /* {{{ */
		if(!$nocheck)
			if(!$this->check_access($view))
				return '';
		$url = $this->html_url($view, $urlparams);
		$tag = "<a href=\"".$url."\"";
		if($linkparams)
			foreach($linkparams as $k=>$v)
				$tag .= " ".$k."=\"".$v."\"";
		$tag .= ">".($hsc ? htmlspecialchars($link) : $link)."</a>";
		return $tag;
	} /* }}} */

	public function jsTranslations($keys) { /* {{{ */
		echo "var trans = {\n";
		foreach($keys as $key) {
			echo "	'".$key."': '".str_replace("'", "\\\'", getMLText($key))."',\n";
		}
		echo "};\n";
	} /* }}} */
}
