<?php

// A suffix for auto generated IDs
define(DND_ID_SUFFIX, '-dnd-library');

/**
 * Implementation of hook_menu().
 */
function dnd_menu() {
  $items = array();
  $items['admin/settings/dnd'] = array(
    'title' => 'Drag and Drop Library',
    'page callback' => 'dnd_admin',
    'description' => 'Configure drag-and-drop enabled textareas.',
    'access arguments' => array('administer dnd'),
    'file' => 'dnd.admin.inc',
  );
  return $items;
}

/**
 * Implementation of hook_perm().
 */
function dnd_perm() {
  return array('administer dnd');
}

/**
 * Implementation of hook_theme().
 */
function dnd_theme() {
  return array(
    'dnd_library' => array('arguments' => array('library' => NULL, 'library_id' => NULL), 'template' => 'dnd-library'),
  );
}


/**
 * Implementation of hook_elements().
 *
 * Overload textareas.
 */
function dnd_elements() {
  $type = array();
  $type['textarea'] = array(
    '#input' => TRUE, 
    '#cols' => 60, 
    '#rows' => 5, 
    '#resizable' => TRUE,
    '#dnd-enabled' => FALSE,
    '#dnd-settings' => NULL,
    '#process' => array('form_expand_ahah', 'dnd_process_textarea'),
  );
  return $type;
}

/**
 * Settings array:
 * What should it take, if anything?  Probably a source * maybe editor specific configuration shit? 
 *
 * - source for library json/ajax shit
 * - target selector
 * - item selector
 *
 * perhaps like so:  
 *
 * global => 
 *   droppable targets
 *   library source for textarea
 * 
 * tinymce/othereditor =>
 *   target selector logic
 *   configuration options
 *   callback should be smart about attachment and detachment
 */
function dnd_process_textarea($element, $edit, $form_state, $form) {
  if ($element['#dnd-enabled']) {

    $settings = array();

    // We take a string or an object or an array
    if (is_string($element['#dnd-settings'])) {
      // @TODO load settings
    } 
    else if (is_object($element['#dnd-settings'])) {
      $settings = (array) $element['#dnd-settings'];
    }
    else if (is_array($element['#dnd-settings'])) {
      $settings = $element['#dnd-settings'];
    }

    // Set some important defaults
    if (function_exists($settings['callback']) && ($library = $settings['callback']($element))) {
      $settings = array('library_id' => $element['#id'] . DND_ID_SUFFIX) + $settings;
      unset($settings['callback']);

      // BeautyTips
      drupal_add_js(drupal_get_path('module', 'dnd') .'/js/bt/other_libs/excanvas_0002/excanvas-compressed.js');
      drupal_add_js(drupal_get_path('module', 'dnd') .'/js/bt/other_libs/jquery.hoverIntent.minified.js');
      drupal_add_js(drupal_get_path('module', 'dnd') .'/js/bt/jquery.bt.js');

      // Dependencies
      drupal_add_js(drupal_get_path('module', 'dnd') .'/js/jquery.url.packed.js');
      drupal_add_js(drupal_get_path('module', 'dnd') .'/js/jquery.fieldselection.js');
      drupal_add_js('misc/jquery.form.js');

      // Drag and drop
      drupal_add_js(drupal_get_path('module', 'dnd') .'/js/jquery.draganddrop.js');
      drupal_add_js(drupal_get_path('module', 'dnd') .'/js/dnd-library.js');

      drupal_add_js(array(
        'dndEnabledLibraries' => array($element['#id'] => $settings),
      ), 'setting');

      // Store editor representations in Drupal setting
      drupal_add_js(array(
        'dndEditorRepresentations' => $library['editor_representations'], 
        'dndLibraryPreviews' => $library['library_previews'], 
      ), 'setting');
      
      $element['#suffix'] = theme('dnd_library', $library['library'], $settings['library_id']) . $element['#suffix'];
    }

  }
  return $element;
}

function template_preprocess_dnd_library($library) {}