<?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_wrapper' => array('arguments' => array('settings' => NULL, 'element' => NULL)),
  );
}


/**
 * 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'];
    }

    $settings = array('library_id' => $element['#id'] . DND_ID_SUFFIX) + $settings;

    // 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');

    // Generate 
    $element['#suffix'] = '<div class="dnd-library-wrapper" id="'. $settings['library_id'] .'"></div>'. $element['#suffix'];

  }
  return $element;
}

/**
 * Implementation of hook_wywiwyg_plugin().
 */
function dnd_wysiwyg_plugin($editor, $version=0) {
  $plugins = array();
  switch ($editor) {
    case 'tinymce':
      if ($version > 3) {
        $plugins['forcecontainer'] = array(
          'title' => t('Force Container Plugin'),
          'description' => t('A custom plugin to forces a selection up to the outer container of a given element.'),
          'extensions' => array('forcecontainer' => t('Force Container')),
          'path' => drupal_get_path('module', 'dnd') .'/js/tinymce/forcecontainer/editor_plugin_src.js', 
          'load' => TRUE,
          'options' => array(
            'forcecontainer_class' => 'dnd-drop-wrapper',
            'forcecontainer_trigger_dnd' => TRUE,
          ),
        );
      }
      break;
  }
  return $plugins;
}


/**
 * Theme the markup that will surround a library loaded via JSON.
 */
function theme_dnd_library_wrapper($settings, $element = NULL) {
  return '<div id="'. $settings['library_id'] .'" class="dnd-library-wrapper"></div>';
}