<?php
/**
 * @file
 * Module creating a multiple image upload widget
 */

/**
 * Implements hook_field_widget_info().
 */
function multiupload_imagefield_widget_field_widget_info() {
  return array(
    'image_miw' => array(
      'label' => t('Multiupload'),
      'field types' => array('image'),
      'behaviors' => array(
        'multiple values' => FIELD_BEHAVIOR_CUSTOM,
        'default value' => FIELD_BEHAVIOR_NONE,
      ),
      'settings' => array(
        'progress_indicator' => 'throbber',
        'preview_image_style' => 'thumbnail',
      ),
    ),
  );
}

 /**
 * Implements hook_field_widget_form().
 *
 * Mostly copied from drupal core module /modules/image/image.field.inc
 */
function multiupload_imagefield_widget_field_widget_form(&$form, &$form_state, $field, $instance, $langcode, $items, $delta, $element ) {
  // Add display_field setting to field because file_field_widget_form() assumes it is set.
  $field['settings']['display_field'] = 0;

  $elements = multiupload_filefield_widget_field_widget_form($form, $form_state, $field, $instance, $langcode, $items, $delta, $element);
  $settings = $instance['settings'];

  foreach (element_children($elements) as $delta) {
    // Add upload resolution validation.
    if ($settings['max_resolution'] || $settings['min_resolution']) {
      $elements[$delta]['#upload_validators']['file_validate_image_resolution'] = array($settings['max_resolution'], $settings['min_resolution']);
    }

    // If not using custom extension validation, ensure this is an image.
    $supported_extensions = array('png', 'gif', 'jpg', 'jpeg');
    $extensions = isset($elements[$delta]['#upload_validators']['file_validate_extensions'][0]) ? $elements[$delta]['#upload_validators']['file_validate_extensions'][0] : implode(' ', $supported_extensions);
    $extensions = array_intersect(explode(' ', $extensions), $supported_extensions);
    $elements[$delta]['#upload_validators']['file_validate_extensions'][0] = implode(' ', $extensions);

    // Add all extra functionality provided by the image widget.
    $elements[$delta]['#process'][] = 'image_field_widget_process';
  }

  if ($field['cardinality'] == 1) {
    // If there's only one field, return it as delta 0.
    if (empty($elements[0]['#default_value']['fid'])) {
      $elements[0]['#description'] = theme('file_upload_help', array('description' => $instance['description'], 'upload_validators' => $elements[0]['#upload_validators']));
    }
  }
  else {
    $elements['#file_upload_description'] = theme('file_upload_help', array('upload_validators' => $elements[0]['#upload_validators']));
  }
  return $elements;
}

/**
 * Implements hook_field_widget_settings_form().
 */
function multiupload_imagefield_widget_field_widget_settings_form($field, $instance) {
  $settings = $instance['widget']['settings'];

  // Use the mfw file widget settings form.
  $form = multiupload_filefield_widget_field_widget_settings_form($field, $instance);

  $form['preview_image_style'] = array(
    '#title' => t('Preview image style'),
    '#type' => 'select',
    '#options' => image_style_options(FALSE),
    '#empty_option' => '<' . t('no preview') . '>',
    '#default_value' => $settings['preview_image_style'],
    '#description' => t('The preview image will be shown while editing the content.'),
    '#weight' => 15,
  );

  return $form;
}

/**
 * An element #process callback for the image_miw field type.
 *
 * Expands the image_miw type to include the description and display fields.
 */
function multiupload_imagefield_widget_field_widget_process($element, &$form_state, &$form) {
  return image_field_widget_process($element, $form_state, $form);
}

/**
 * Implements hook_insert_widgets() for compatibility with insert.module.
 */
function multiupload_imagefield_widget_insert_widgets() {
  $items['image_miw'] = array(
    'element_type' => 'mfw_managed_file',
    'wrapper' => '.image-widget',
    'fields' => array(
      'alt' => 'input[name$="[alt]"], textarea[name$="[alt]"]',
      'title' => 'input[name$="[title]"], textarea[name$="[title]"]',
      'description' => 'input[name$="[description]"], textarea[name$="[description]"]',
    ),
  );
  return $items;
}

/**
 * Implementation of hook_insert_styles() for compatibility with insert.module.
 */
function multiupload_imagefield_widget_insert_styles() {
  return image_insert_styles();
}

/**
 * Implementation of hook_insert_content() for compatibility with insert.module.
 */
function multiupload_imagefield_widget_insert_content($item, $style, $widget) {
  return image_insert_content($item, $style, $widget);
}