<?php
class Unit extends AppModel {

	var $name = 'Unit';
	var $validate = array(
		'id' => array('numeric'),
		'unit_size_id' => array('numeric'),
		'name' => array('notempty'),
		'sort_order' => array('numeric'),
		'walk_order' => array('numeric'),
		'deposit' => array('money'),
		'amount' => array('money')
	);

	var $belongsTo = array(
		'UnitSize',
	);

	var $hasOne = array(
		'CurrentLease' => array(
			'className' => 'Lease',
			'conditions' => 'CurrentLease.moveout_date IS NULL',
		),
	);

	var $hasMany = array(
		'Lease',
		'LocksUnit'
	);

	var $hasAndBelongsToMany = array(
		'Lock'
	);

	//var $default_log_level = array('log' => 30, 'show' => 15);

  /**************************************************************************
   **************************************************************************
   **************************************************************************
   * helpers: status enumerations
   */

  function statusEnums() {
    static $status_enums;
    if (!isset($status_enums))
      $status_enums = $this->getEnumValues('status');
    return $status_enums;
  }

  function activeStatusEnums() {
    return array_diff_key($this->statusEnums(), array(''=>1, 'DELETED'=>1));
  }

  function statusValue($enum) {
    $enums = $this->statusEnums();
    return $enums[$enum];
  }

  function occupiedEnumValue() {
    return $this->statusValue('OCCUPIED');
  }

  function statusCheck($id_or_enum,
		       $min = null, $min_strict = false,
		       $max = null, $max_strict = false)
  {
    $this->prEnter(compact('id_or_enum', 'min', 'min_strict', 'max', 'max_strict'));

    if (is_int($id_or_enum)) {
      $this->id = $id_or_enum;
      $id_or_enum = $this->field('status');
    }

    $enum_val = $this->statusValue($id_or_enum);
    if (isset($min) && is_string($min))
      $min = $this->statusValue($min);
    if (isset($max) && is_string($max))
      $max = $this->statusValue($max);

    $this->pr(17, compact('enum_val', 'min', 'min_strict', 'max', 'max_strict'));

    if (isset($min) &&
	($enum_val < $min ||
	 ($min_strict && $enum_val == $min)))
      return $this->prReturn(false);

    if (isset($max) &&
	($enum_val > $max ||
	 ($max_strict && $enum_val == $max)))
      return $this->prReturn(false);

    return $this->prReturn(true);
  }

  function locked($enum) {
    return $this->statusCheck($enum, 'LOCKED', false, null, false);
  }

  function conditionLocked() {
    //return array('Unit.status' => 'LOCKED');
    return ('Unit.status >= ' . $this->statusValue('LOCKED'));
  }

  function liened($enum) {
    return $this->statusCheck($enum, 'LIENED', false, null, false);
  }

  function conditionLiened() {
    return ('Unit.status >= ' . $this->statusValue('LIENED'));
  }

  function occupied($enum) {
    return $this->statusCheck($enum, 'OCCUPIED', false, null, false);
  }

  function conditionOccupied() {
    return ('Unit.status >= ' . $this->statusValue('OCCUPIED'));
  }

  function vacant($enum) {
    return $this->statusCheck($enum, 'UNAVAILABLE', true, 'OCCUPIED', true);
  }

  function conditionVacant() {
    return ('Unit.status BETWEEN ' .
      ($this->statusValue('UNAVAILABLE')+1) .
      ' AND ' .
      ($this->statusValue('OCCUPIED')-1));
  }

  function unavailable($enum) {
    return $this->statusCheck($enum, null, false, 'UNAVAILABLE', false);
  }

  function conditionUnavailable() {
    return ('Unit.status <= ' . $this->statusValue('UNAVAILABLE'));
  }

  function available($enum) { return $this->vacant($enum); }
  function conditionAvailable() { return $this->conditionVacant($enum); }


  /**************************************************************************
   **************************************************************************
   **************************************************************************
   * function: allowedStatusSet
   *  - Returns the status set allowed for the given unit
   */
  function allowedStatusSet($id) {
    $this->prEnter(compact('id'));
    $this->id = $id;
    $old_status = $this->field('status');
    $old_val = $this->statusValue($old_status);
    $this->pr(17, compact('old_status', 'old_val'));

    $enums = $this->activeStatusEnums();
    $this->pr(21, compact('enums'));

    foreach ($enums AS $enum => $val) {
      if (($old_val < $this->occupiedEnumValue()) != 
	  ($val     < $this->occupiedEnumValue())) {
	unset($enums[$enum]);
      }
    }

    return $this->prReturn($enums);
  }


  /**************************************************************************
   **************************************************************************
   **************************************************************************
   * function: updateStatus
   *  - Update the given unit to the given status
   */
  function updateStatus($id, $status, $check = false) {
    $this->prEnter(compact('id', 'status', 'check'));

/*     if ($check) { */
/*       $old_status = $this->field('status'); */
/*       $this->pr(17, compact('old_status')); */
/*       if ($this->statusValue($old_status) < $this->occupiedEnumValue() && */
/* 	  $this->statusValue($status)    >= $this->occupiedEnumValue()) */
/* 	{ */
/* 	  die("Can't transition a unit from vacant to occupied"); */
/* 	  return $this->prReturn(false); */
/* 	} */
/*       if ($this->statusValue($old_status) >= $this->occupiedEnumValue() && */
/* 	  $this->statusValue($status)      < $this->occupiedEnumValue()) */
/* 	{ */
/* 	  die("Can't transition a unit from occupied to vacant"); */
/* 	  return $this->prReturn(false); */
/* 	} */
/*     } */

    if ($check) {
      if (!array_key_exists($status, $this->allowedStatusSet($id)))
	return $this->prReturn(false);
    }

    $this->id = $id;
    $this->saveField('status', $status);
    return $this->prReturn(true);
  }


  /**************************************************************************
   **************************************************************************
   **************************************************************************
   * function: update
   *  - Update any cached or calculated fields
   */
  function update($id) {
  }


  /**************************************************************************
   **************************************************************************
   **************************************************************************
   * function: lockUnit
   *  - Put lock on unit
   */
  function lockUnit($id, $lock_ids) {
    $this->prEnter(compact('id', 'lock_ids'));
    $this->id = $id;

    // Remove any exising locks for this unit
    $this->LocksUnit->deleteAll
      (array('unit_id' => $id), false);

    // We'll proceed forward as much as possible, even
    // if we encounter an error.  For now, we'll assume
    // the operation will succeed.
    $ret = true;

    // Go through each lock, and put them on the unit
    foreach ($lock_ids AS $lock_id) {
      $pair['unit_id'] = $id;
      $pair['lock_id'] = $lock_id;

      // Save the relationship between lock and unit
      $LU = new LocksUnit();
      if (!$LU->save($pair, false))
	$ret = false;
    }

    return $this->prReturn($ret);
  }


  /**************************************************************************
   **************************************************************************
   **************************************************************************
   * function: stats
   *  - Returns summary data from the requested customer.
   */

  function stats($id = null) {
    if (!$id)
      return null;

    // Get the basic information necessary
    $unit = $this->find('first',
			array('contain' => array
			      ('Lease' => array
			       ('fields' => array('Lease.id')),

			       'CurrentLease' => array
			       ('fields' => array('CurrentLease.id'))),

			      'conditions' => array
			      (array('Unit.id' => $id)),
			      ));

    // Get the stats for the current lease
    $stats['CurrentLease'] = $this->Lease->stats($unit['CurrentLease']['id']);

    // Sum the stats for all leases together
    foreach ($unit['Lease'] AS $lease) {
      $this->statsMerge($stats['Lease'], $this->Lease->stats($lease['id']));
    }

    // Return the collection
    return $stats;
  }

}