<?php
// $Id;
/**
 * @file
 * Defines a special textarea, with drag and drop media driven by Scald and 
 * dnd.module when rich text editing is enabled on the textarea via the 
 * WYSIWYG API. 
 */

/**
 * Implementation of hook_theme().
 */
function mee_theme() {
  $theme = array(
    'mee_textarea' => array(
      'arguments' => array('element' => NULL),
    ),
    'mee_formatter_default' => array(
      'arguments' => array('element' => NULL),
    ),
  );

  $scald_config = variable_get('scald_config', 0);
  foreach ($scald_config->contexts as $context => $details) {
    $theme['mee_formatter_'. $context] = array(
      'arguments' => array('element' => NULL),
      'function' => 'theme_mee_context_formatter',
    );
  }
  return $theme;
}

/**
 * Implementation of hook_field_info().
 */
function mee_field_info() {
  return array(
    'multimedia_editorial_element' => array(
      'label' => t('Multimedia Editorial Element (MEE)'),
      'description' => t('MEE combines Scald, WYSIWYG, and DnD to create a multimedia enabled text field.'),
    ),
  );
}

/**
 * Implementation of hook_field_settings().
 */
function mee_field_settings($op, $field) {
  switch ($op) {
    case 'form':
      $form = array();
      $options = array(0 => t('Plain text'), 1 => t('Filtered text (user selects input format)'));
      $form['mee_processing'] = array(
        '#type' => 'radios',
        '#title' => t('Text processing'),
        '#default_value' => is_numeric($field['mee_processing']) ? $field['mee_processing'] : 1,
        '#options' => $options,
        '#description' => t('Filtered text, with a WYSIWYG editor defined on one or more input formats, is strongly recommended.'),
      );
      // @TODO Ask Drupal about available libraries
      $form['mee_dnd_callback_url'] = array(
        '#type' => 'textfield',
        '#title' => t('Library callback URL'),
        '#default_value' => url($field['mee_dnd_callback_url']) ? $field['mee_dnd_callback_url'] : '',
        '#description' => t('The absolute URL or relative path of a callback URL that provides proper JSON to the drag and drop library.'),
      );
      return $form;

    case 'save':
      return array('mee_processing', 'mee_dnd_callback_url');

    case 'database columns':
      $columns['value'] = array('type' => 'text', 'size' => 'big', 'not null' => FALSE, 'sortable' => TRUE);
      $columns['dnd_callback_url'] = array('type' => 'text', 'size' => 'small', 'not null' => FALSE);
      if (!empty($field['mee_processing'])) {
        $columns['format'] = array('type' => 'int', 'unsigned' => TRUE, 'not null' => FALSE);
      }
      return $columns;

    case 'views data':
      return content_views_field_views_data($field);
  }
}

/**
 * Implementation of hook_field().
 */
function mee_field($op, &$node, $field, &$items, $teaser, $page) {
  switch ($op) {
    case 'presave':
      // @@@TODO: parse the field & replace editor reps with SAS
      break; // end 'submit'

    case 'insert':
      // @@@TODO: register a new Atom based on this textarea
      foreach ($items as $delta => $item) {
        $temp_atom = new stdClass;
        $temp_atom->type = 'composite';
        $temp_atom->provider = 'mee';
        $temp_atom->base_id = $node->nid . ':' . $delta;
        $temp_atom->uid = $node->uid;
        $temp_atom->title = $node->title;
        $temp_atom->authors = array(scald_uid_to_aid($node->uid));
        $scald_included = scald_included($node->body);
        $temp_atom->relationships = empty($scald_included) ? array() : array('includes' => $scald_included);
        $sid = scald_register_atom($temp_atom);
      }
      break; // end 'insert'

    case 'update':
      foreach ($items as $delta => $item) {

      }
      // @@@TODO: Update the existing Atom
      break; // end 'update'

    case 'delete':
      // @@@TODO: Remove the Atom based on this instance of the field
      break; // end 'delete'

    case 'sanitize':
      foreach ($items as $delta => $item) {
        if (!empty($field['mee_processing'])) {
          $check = is_null($node) || (isset($node->build_mode) && $node->build_mode == NODE_BUILD_PREVIEW);
          $text = isset($item['value']) ? check_markup($item['value'], $item['format'], $check) : '';
        }
        else {
          $text = check_plain($item['value']);
        }
        $items[$delta]['safe'] = $text;
      }
      break; // end 'sanitize'
  }
}

/**
 * Implementation of hook_content_is_empty().
 */
function mee_content_is_empty($item, $field) {
  if (empty($item['value']) && (string)$item['value'] !== '0') {
    return TRUE;
  }
  return FALSE;
}

/**
 * Implementation of hook_field_formatter_info().
 */
function mee_field_formatter_info() {
  $formatters = array(
    'default' => array(
      'label' => t('Filtered text'),
      'field types' => array('multimedia_editorial_element'),
      'multiple values' => CONTENT_HANDLE_CORE,
    ),
    'plain' => array(
      'label' => t('Plain text'),
      'field types' => array('multimedia_editorial_element'),
      'multiple values' => CONTENT_HANDLE_CORE,
    ),
  );
  //@TODO generate context processor based field formatters
  //foreach (scald_contexts() as $context) {
  //  $formatters[$context] = array(
  //    'label' => t('Scald context processor: @context', array('@context' => $context),
  //    'field types' => 'mee',
  //  );
  //}
  return $formatters; 
}

function theme_mee_formatter_default($element) {
  return $element['#item']['safe'];
}

/**
 * Theme function for 'plain' text field formatter.
 */
function theme_mee_formatter_plain($element) {
  return strip_tags($element['#item']['safe']);
}

function theme_mee_context_formatter($element) {
  return 'foo';
}

/**
 * Implementation of hook_widget_info().
 */
function mee_widget_info() {
  return array(
    'mee_textarea' => array(
      'label' => t('MEE Textarea'),
      'field types' => array('multimedia_editorial_element'),
      'multiple values' => CONTENT_HANDLE_CORE,
    ),
  );
}

/**
 * Implementation of FAPI hook_elements().
 *
 * Any FAPI callbacks needed for individual widgets can be declared here,
 * and the element will be passed to those callbacks for processing.
 *
 * Drupal will automatically theme the element using a theme with
 * the same name as the hook_elements key.
 */
function mee_elements() {
  return array(
    'mee_textarea' => array(
      '#input' => TRUE,
      '#columns' => array('value', 'format'), '#delta' => 0,
      '#process' => array('mee_textarea_process', 'dnd_process_textarea'),
      '#filter_value' => FILTER_FORMAT_DEFAULT,
    ),
  );
}

/**
 * Implementation of hook_widget_settings().
 */
function mee_widget_settings($op, $widget) {
  switch ($op) {
    case 'form':
      $form = array();
      $rows = (isset($widget['rows']) && is_numeric($widget['rows'])) ? $widget['rows'] : 5;
      $size = (isset($widget['size']) && is_numeric($widget['size'])) ? $widget['size'] : 60;
      $form['rows'] = array(
        '#type' => 'textfield',
        '#title' => t('Rows'),
        '#default_value' => $rows,
        '#element_validate' => array('_mee_widget_settings_row_validate'),
        '#required' => TRUE,
      );
      $form['size'] = array('#type' => 'hidden', '#value' => $size);
      return $form;

    case 'save':
      return array('rows', 'size');
  }
}

function _mee_widget_settings_row_validate($element, &$form_state) {
  $value = $form_state['values']['rows'];
  if (!is_numeric($value) || intval($value) != $value || $value <= 0) {
    form_error($element, t('"Rows" must be a positive integer.'));
  }
}

function _mee_widget_settings_size_validate($element, &$form_state) {
  $value = $form_state['values']['size'];
  if (!is_numeric($value) || intval($value) != $value || $value <= 0) {
    form_error($element, t('"Size" must be a positive integer.'));
  }
}

/**
 * Implementation of hook_widget().
 *
 * Attach a single form element to the form. It will be built out and
 * validated in the callback(s) listed in hook_elements. We build it
 * out in the callbacks rather than here in hook_widget so it can be
 * plugged into any module that can provide it with valid
 * $field information.
 *
 * Content module will set the weight, field name and delta values
 * for each form element. This is a change from earlier CCK versions
 * where the widget managed its own multiple values.
 *
 * If there are multiple values for this field, the content module will
 * call this function as many times as needed.
 *
 * @param $form
 *   the entire form array, $form['#node'] holds node information
 * @param $form_state
 *   the form_state, $form_state['values'][$field['field_name']]
 *   holds the field's form values.
 * @param $field
 *   the field array
 * @param $items
 *   array of default values for this field
 * @param $delta
 *   the order of this item in the array of subelements (0, 1, 2, etc)
 *
 * @return
 *   the form item for a single element for this field
 */
function mee_widget(&$form, &$form_state, $field, $items, $delta = 0) {
  $element = array(
    '#type' => $field['widget']['type'],
    '#default_value' => isset($items[$delta]) ? $items[$delta] : '',
  );
  return $element;
}

/**
 * Process an individual element.
 *
 * Build the form element. When creating a form using FAPI #process,
 * note that $element['#value'] is already set.
 *
 * The $fields array is in $form['#field_info'][$element['#field_name']].
 */
function mee_textarea_process($element, $edit, $form_state, $form) {
  drupal_add_css(drupal_get_path('module', 'mee') .'/css/mee.css');

  $field = $form['#field_info'][$element['#field_name']];
  $field_key   = $element['#columns'][0];
  $element[$field_key] = array(
    '#type' => 'textarea',
    '#default_value' => isset($element['#value'][$field_key]) ? $element['#value'][$field_key] : NULL,
    '#rows' => !empty($field['widget']['rows']) ? $field['widget']['rows'] : 10,
    '#weight' => 0,
    // The following values were set by the content module and need
    // to be passed down to the nested element.
    '#title' => $element['#title'],
    '#description' => $element['#description'],
    '#required' => $element['#required'],
    '#field_name' => $element['#field_name'],
    '#type_name' => $element['#type_name'],
    '#delta' => $element['#delta'],
    '#columns' => $element['#columns'],
    '#prefix' => '<div class="mee-wrap-editor-library">',
    '#suffix' => '</div>',
    '#dnd-enabled' => TRUE,
    '#dnd-settings' => array(
      'drop_selector' => '#'. $element['#id'] .' .drop',
      'url' => $field['mee_dnd_callback_url'],
    ),
  );

  if (!empty($field['mee_processing'])) {
    $filter_key  = (count($element['#columns']) == 2) ? $element['#columns'][1] : 'format';
    $format = isset($element['#value'][$filter_key]) ? $element['#value'][$filter_key] : FILTER_FORMAT_DEFAULT;
    $parents = array_merge($element['#parents'] , array($filter_key));
    $element[$filter_key] = filter_form($format, 1, $parents);
  }

  // Used so that hook_field('validate') knows where to flag an error.
  $element['_error_element'] = array(
    '#type' => 'value',
    '#value' => implode('][', array_merge($element['#parents'], array($field_key))),
  );


  return $element;
}

/**
 * FAPI theme for an individual text elements.
 *
 * The textfield or textarea is already rendered by the
 * textfield or textarea themes and the html output
 * lives in $element['#children']. Override this theme to
 * make custom changes to the output.
 *
 * $element['#field_name'] contains the field name
 * $element['#delta]  is the position of this element in the group
 */
function theme_mee_textarea($element) {
  return $element['#children'];
}






/*******************************************************************************
 * SCALD HOOK IMPLEMENTATIONS
 ******************************************************************************/

/**
 * Implementation of hook_scald_provider().
 */
function mee_scald_provider() {
  return array(
    'atoms'    => array(
      'composite' => t('The MEE CCK field.'),
    ),
  );
}



/**
 * Implementation of hook_scald_register_atom().
 */
function mee_scald_register_atom($atom, $mode) {

} // end mee_scald_register_atom()



/**
 * Implementation of hook_scald_update_atom().
 */
function mee_scald_update_atom($atom, $mode) {

} // end mee_scald_update_atom()



/**
 * Implementation of hook_scald_unregister_atom().
 */
function mee_scald_unregister_atom($atom, $mode) {

} // end mee_scald_unregister_atom()



/**
 * Implementation of hook_scald_fetch().
 */
function mee_scald_fetch(&$atom) {
  list($nid, $delta) = split(':', $atom->base_id);
  $node = node_load($nid);
  $atom->title = $node->title . '(' . $delta . ')';
  $atom->description = $atom->title;  // @@@TODO: Maybe make this a better description?
  $atom->thumbnail_source = drupal_get_path('module', 'scald_composites') . '/assets/thumbnail_composite.png';
} // end mee_scald_fetch()



/**
 * Implementation of hook_scald_prerender().
 */
function mee_scald_prerender(&$atom, $mode) {

} // end mee_scald_prerender()