<?php

/*********************************************************************************************
 * 
 * FIELD DEFINITION
 * 
 ********************************************************************************************/
/**
 * Implements hook_field_widget_info().
 */
function switch_field_widget_info(){
  return array(
    'switch' => array(
      'label' => t('Switch'),
      'field types' => array(
        'list_boolean'
      ),
      'behaviors' => array(
        'multiple values' => FIELD_BEHAVIOR_CUSTOM
      )
    )
  );
}

/**
 * Implements hook_field_widget_settings_form().
 */
function switch_field_widget_settings_form($field, $instance){
  $form = array();
  $form['display_label'] = array(
    '#type' => 'checkbox',
    '#title' => t('Use field label instead of the "On value" as label'),
    '#default_value' => $instance['widget']['settings']['display_label'],
    '#weight' => -1
  );
  return $form;
}

/**
 * Implements hook_field_widget_form().
 */
function switch_field_widget_form(&$form, &$form_state, $field, $instance, $langcode, $items, $delta, $element){
  // Abstract over the actual field columns, to allow different field types to
  // reuse those widgets.
  $value_key = key($field['columns']);
  $type = str_replace('options_', '', $instance['widget']['type']);
  $multiple = $field['cardinality'] > 1 || $field['cardinality'] == FIELD_CARDINALITY_UNLIMITED;
  $required = $element['#required'];
  $has_value = isset($items[0][$value_key]);
  $properties = _options_properties($type, $multiple, $required, $has_value);
  // Prepare the list of options.
  $options = _options_get_options($field, $instance, $properties);
  // Put current field values in shape.
  $default_value = _options_storage_to_form($items, $options, $value_key, $properties);
  $keys = array_keys($options);
  $off_value = array_shift($keys);
  $on_value = array_shift($keys);
  $element += array(
    '#type' => 'switch',
    '#default_value' => (isset($default_value[0]) && $default_value[0] == $on_value) ? 1 : 0,
    '#on_value' => $on_value,
    '#off_value' => $off_value
  );
  // Override the title from the incoming $element.
  $element['#title'] = isset($options[$on_value]) ? $options[$on_value] : '';
  if($instance['widget']['settings']['display_label']){
    $element['#title'] = $instance['label'];
  }
  $element += array(
    '#value_key' => $value_key,
    '#element_validate' => array(
      'options_field_widget_validate'
    ),
    '#properties' => $properties
  );
  return $element;
}

/*********************************************************************************************
 * 
 * ELEMENT DEFINITION
 * 
 ********************************************************************************************/
/**
 * Implements hook_element_info().
 */
function switch_element_info(){
  $path = drupal_get_path('module', 'switch');
  $types['switch'] = array(
    '#input' => TRUE,
    '#return_value' => 1,
    '#process' => array(
      'form_process_checkbox',
      'ajax_process_form'
    ),
    '#theme' => 'checkbox',
    '#theme_wrappers' => array(
      'form_element'
    ),
    '#title_display' => 'after',
    '#value_callback' => 'switch_value_callback'
  );
  $types['switch']['#attached']['js'] = array(
    $path . '/js/switch.js'
  );
  $types['switch']['#attached']['js'][] = array(
    'data' => array(
      'switch' => array(
        'switch_on_container_path' => file_create_url($path . '/images/iphone_switch_container_on.png'),
        'switch_off_container_path' => file_create_url($path . '/images/iphone_switch_container_off.png'),
        'switch_path' => file_create_url($path . '/images/iphone_switch.png'),
        'mouse_over' => 'pointer',
        'mouse_out' => 'default',
        'switch_height' => 27,
        'switch_width' => 94
      )
    ),
    'type' => 'setting'
  );
  return $types;
}

/**
 * Element value callback.
 */
function switch_value_callback($element, $input = FALSE, &$form_state){
  if($input !== FALSE){
    if(empty($input)){return 0;}
  }elseif(!empty($element['#default_value'])){return $element['#default_value'];}
}