<?php

/* 2DO
 - Module die conditional block visibility doet
 - Module die link tussen actions en conditions doet
 */

/**
* Implementation of hook_menu().
*/
function condition_menu() {
	$items['admin/build/condition'] = array(
		'title' => 'Conditions',
		'description' => 'Configure conditions other modules use to trigger actions.',
		'page callback' => 'drupal_get_form',
		'page arguments' => array('condition_list_form'),
		'access arguments' => array('administer conditions'),
		'file' => 'condition.admin.inc',
	);
	$items['admin/build/condition/list'] = array(
    'title' => t('List'),
    'weight' => -10,
    'type' => MENU_DEFAULT_LOCAL_TASK,
  );
	$items['admin/build/condition/add'] = array(
    'title' => t('Add'),
    'page callback' => 'drupal_get_form',
    'page arguments' => array('condition_edit_form'),
    'type' => MENU_LOCAL_TASK,
    'file' => 'condition.admin.inc',
  );
	$items['admin/build/condition/%condition/edit'] = array(
    'title' => t('Edit'),
    'page callback' => 'drupal_get_form',
    'page arguments' => array('condition_edit_form', 3),
    'type' => MENU_CALLBACK,
    'file' => 'condition.admin.inc',
  );
	$items['admin/build/condition/%condition/delete'] = array(
    'title' => t('Delete'),
    'page callback' => 'drupal_get_form',
    'page arguments' => array('condition_delete_form', 3),
    'type' => MENU_CALLBACK,
    'file' => 'condition.admin.inc',
  );

  return $items;
}

/**
* Implementation of hook_perm().
*/
function condition_perm() {
  return array('administer conditions');
}

/**
* Implementation of hook_theme().
*/
function condition_theme() {
  return array(
    'condition_edit_form' => array('arguments' => array('form' => NULL)),
    'condition_list_form' => array('arguments' => array('form' => NULL)),
  );
}

/**
* Implementation of hook_help().
*/
function condition_help($path, $arg) {
  switch ($path) {
    case 'admin/build/condition':
      return '<p>'.t('Conditions are sets of requirements that make the condition met (<em>TRUE</em>) or not (<em>FALSE</em>). Other modules can provide requirements (e.g. requested path is <em>admin/*</em>) or use the Condition API to trigger some kind of action (e.g. switch theme to <em>Garland</em>) in case a condition is met. Start by !adding a condition.', array('!adding' => l(t('adding'), 'admin/build/condition/add'))).'</p>';
  }
}

/**
* Loading one, more or all conditions.
*/
function condition_load($cid = NULL) {
	static $conditions;
	
	if (!is_array($conditions)) {
	
		if (is_numeric($cid)) {
			$condition = db_fetch_object(db_query("SELECT * FROM {conditions} WHERE cid = %d", $cid));
			$condition->parameters = (array) unserialize($condition->parameters);
			return $condition;
			
		} else {
			$result	= db_query("SELECT * FROM {conditions} ORDER BY weight ASC");
			$conditions	= array();
			
			while ($condition = db_fetch_object($result)) {
				$condition->parameters = (array) unserialize($condition->parameters);
				$conditions[$condition->cid] = $condition;
			}
		}
	}
		
	if (is_array($conditions)) {
		
		if (is_numeric($cid)) {
			return $conditions[$cid];
			
		} elseif (is_array($cid)) {
			return array_intersect_key($conditions, array_flip($cid));
			
		} else {		
			return $conditions;
		}		
	}
}

/**
* Saving one or more conditions.
*/
function condition_save($condition) {
	
	if (is_array($condition)) {
		
		foreach (array_keys($condition) as $key) {
			$condition[$key]->saved = condition_save($condition[$key]);
		}
		
		return $condition;
	}
	
	if ($condition->parameters) {
		$condition->parameters = serialize($condition->parameters);
	}

	return drupal_write_record('conditions', $condition, $condition->cid ? 'cid' : array());
}

/**
* Deleting one or more conditions.
*/
function condition_delete($condition) {
	
	if (is_array($condition)) {
		
		foreach (array_keys($condition) as $key) {
			$condition[$key]->deleted = condition_delete($condition[$key]);
		}
		
		return $condition;
	}
	
	if (!is_object($condition)) {
		$condition = condition_load($condition);
	}
	
	return db_query("DELETE FROM {conditions} WHERE cid = %d", $condition->cid);
}

/**
* Validating a condition.
*/
function condition_validate($condition) {
	static $validations;
	
	if (is_array($condition)) {
		
		foreach (array_keys($condition) as $key) {
			$condition[$key]->valid = condition_validate($condition[$key]);
		}
		
		return $condition;
	}

	if (is_array($validations) && isset($validations[$condition->cid])) {
		$condition->valid = $validations[$condition->cid];
		return $condition;
	}
		
	$requirements	= module_invoke_all('requirement_info');
	$valid				= TRUE;
	
	if (is_array($requirements) && count($requirements)) {
		
		foreach ($requirements as $requirement => $info) {

			if ($condition->parameters[$requirement]) {

				if ($name($condition->parameters[$requirement]) === FALSE) {
					$valid = FALSE;
					break;
				}
			}
		}
	}
	
	return $validations[$condition->cid] = $valid;
}

?>