<?php
class Lock extends AppModel {

	var $name = 'Lock';
	var $validate = array(
		'id' => array('numeric'),
		'name' => array('notempty'),
		'key' => array('notempty')
	);

	var $hasMany = array(
		'LocksUnits'
	);

	var $hasAndBelongsToMany = array(
		'Unit'
	);

	var $default_log_level = array('log' => 30, 'show' => 15);


  /**************************************************************************
   **************************************************************************
   **************************************************************************
   * function: saveLock
   *  - save data about a new or existing lock
   */

  function saveLock($data) {
    $this->prEnter(compact('data'));
    $id = $data['Lock']['id'];

    if ($id) {
      $this->id = $id;

      // Save the old key
      $oldkey = $this->field('key');
      $this->pr(5, compact('oldkey'));

      if ($this->field('key') != $data['Lock']['key']) {
	$data['Lock']['key_last'] = $this->field('key');
	$data['Lock']['key_ts'] = date('Y-m-d G:i:s');
      }

      /* // Find the number of outstanding locks in use */
      /* $locks = $this->find('first', */
      /* 			   array('link' => array('Unit' => array('fields' => array('Unit.id'))), */
      /* 				 'fields' => 'SUM(Unit.id) AS inuse', */
      /* 				 'conditions' => array('Lock.id' => $id), */
      /* 				 )); */
      /* $this->pr(5, compact('locks')); */

      /* // Can't reduce the locks if there are all in use */
      /* if ($locks[0]['inuse'] > $data['Lock']['qty']) */
      /* 	return $this->prReturn(false); */
    }
    else {
      // Brand new lock
    }

    if (!$data['Lock']['qty'])
      $data['Lock']['qty'] = 1;

    // Everything looks good... save it!
    return $this->prReturn($this->save($data, false));
  }


  /**************************************************************************
   **************************************************************************
   **************************************************************************
   * function: destroy
   *  - destroys a lock
   */

  function destroy($id) {
    $this->prEnter(compact('id'));

    // Can't delete a lock that's in use... check.
    $this->id = $id;
    $lock = $this->find
      ('first', array
       ('contain' => array('Unit'),
	));

    // If it's in use, bail with error
    $this->pr(1, $lock);
    if (isset($lock['Unit']) && count($lock['Unit']) > 0)
      return $this->prReturn(false);

    // Otherwise, attempt to delete the lock from the database
    return $this->prReturn($this->delete());
  }


  /**************************************************************************
   **************************************************************************
   **************************************************************************
   * function: lockList
   *  - list of all locks in the system
   */

  function lockList() {
    return $this->find('list',
		       array('order' =>
			     array('name'),
			     ));
  }

}