<?php

/**
 * Implements hook_drupal_goto_alter().
 */
function tui_drupal_goto_alter(&$path, &$options, &$http_response_code){
  if($path == 'batch'){
    $batch = batch_get();
    if(strpos($batch['source_url'], 'hierarchy/form_callback/delete-form')){
      $options['query']['render'] = 'overlay';
    }
  }
}

/**
 * Implementation of hook_menu().
 */
function tui_menu(){
  return array(
    // Callback to get a branch.
    'admin/structure/taxonomy/%taxonomy_vocabulary_machine_name/hierarchy/callback/%taxonomy_term' => array(
      'title' => 'TUI callback',
      'page callback' => 'tui_hierarchy_page_callback',
      'page arguments' => array(
        3,
        6
      ),
      'access callback' => 'tui_access_callback',
      'access arguments' => array(
        3
      ),
      'type' => MENU_CALLBACK,
      'file' => 'tui.admin.inc'
    ),
    'admin/structure/taxonomy/%taxonomy_vocabulary_machine_name/hierarchy/form_callback/add-form' => array(
      'title' => 'TUI form callback',
      'page callback' => 'tui_form_callback',
      'page arguments' => array(
        3,
        6,
        7
      ),
      'access callback' => 'tui_access_callback',
      'access arguments' => array(
        3
      ),
      'type' => MENU_CALLBACK,
      'file' => 'tui.ajax.inc'
    ),
    // Callback to get all forms.
    'admin/structure/taxonomy/%taxonomy_vocabulary_machine_name/hierarchy/form_callback/%/%' => array(
      'title' => 'TUI form callback',
      'page callback' => 'tui_form_callback',
      'page arguments' => array(
        3,
        6,
        7
      ),
      'access callback' => 'tui_taxonomy_term_edit_access',
      'access arguments' => array(
        6,
        7
      ),
      'type' => MENU_CALLBACK,
      'file' => 'tui.ajax.inc'
    ),
    // Callback for after a sort.
    'tui/sort' => array(
      'title' => 'TUI sort callback',
      'page callback' => 'tui_sort_callback',
      'access callback' => 'tui_sort_access',
      'type' => MENU_CALLBACK,
      'file' => 'tui.ajax.inc'
    ),
    // Autocomplete callback for the search form
    'tui/autocomplete' => array(
      'title' => 'Autocomplete taxonomy',
      'page callback' => 'tui_autocomplete',
      'access arguments' => array(
        'access content'
      ),
      'type' => MENU_CALLBACK,
      'file' => 'tui.admin.inc'
    )
  );
}

/**
 * Multiple term edit access callback.
 */
function tui_taxonomy_term_edit_access($form, $args){
  switch($form){
    case 'search-form':
      return TRUE;
      break;
    default:
      // We load all terms to ensure that they're in the same vocabulary.
      $tids = explode(",", $args);
      $terms = taxonomy_term_load_multiple($tids);
      foreach($terms as $term){
        if(!is_object($term) || !taxonomy_term_edit_access($term)){return FALSE;}
      }
      return TRUE;
  }
}

/**
 * Sort form access callback
 */
function tui_sort_access(){
  // Check we have access to edit ALL the terms we have been sent.
  return tui_taxonomy_term_edit_access('sort-access', $_POST['sort_change']['tids']);
}

/**
 * Implementation of hook_module_implements_alter(){
 */
function tui_module_implements_alter(&$imps, $hook){
  if(isset($imps['tui'])){
    $tui = $imps['tui'];
    unset($imps['tui']);
    $imps['tui'] = $tui;
  }
}

/**
 * Implementation of hook_form_FORM_ID_alter().
 */
function tui_form_taxonomy_form_term_alter(&$form, &$form_state, $form_id){
  //Change the widget of the parent relation to deal with large taxonomies
  $form['relations']['parent']['#type'] = 'textfield';
  // Ensure the taxonomy.admin.inc file is included.
  form_load_include($form_state, 'inc', 'taxonomy', 'taxonomy.admin');
  unset($form['relations']['parent']['#options']);
  if(arg(5) == 'form_callback' || (arg(0) == 'system' && arg(1) == 'ajax')){
    // Hide the alias field.
    $form['path']['alias']['#type'] = 'hidden';
    // Alter the submit.
    $form['actions']['submit']['#ajax'] = array(
      'callback' => 'tui_ajax_form_callback',
      'wrapper' => 'taxonomy-form-term'
    );
    // Hide the relations fieldset.
    $form['relations']['#attributes'] = array(
      'style' => 'display:none'
    );
    // Add a parent if we have one.
    if(isset($_POST['tid'])){
      $parent_term = taxonomy_term_load($_POST['tid']);
      $form['relations']['parent'] = array(
        '#type' => 'value',
        '#value' => $_POST['tid']
      );
      $form['parent_message'] = array(
        '#weight' => -1000,
        '#markup' => '<div class="messages status"><h2 class="element-invisible">Status message</h2>' . t('This term will be added as a child of "@term_name"', array(
          '@term_name' => $parent_term->name
        )) . '</div>'
      );
    }
    // Add the destination as a value so that we can use it later.
    if(isset($_GET['destination'])){
      $form['tui_destination'] = array(
        '#type' => 'value',
        '#value' => $_GET['destination']
      );
    }
  }else if(arg(0) == 'taxonomy' && arg(1) == 'term' && is_numeric(arg(2)) && arg(3) == 'edit'){
    // Redirect to the taxonomy editor if trying to edit a single term.
    if(variable_get('reverse_proxy', FALSE) || (isset($_COOKIE['has_js']) && $_COOKIE['has_js'])){
      $options = array();
      if(isset($_GET['destination'])){
        $options = array(
          'query' => array(
            'destination' => $_GET['destination']
          )
        );
        unset($_GET['destination']);
      }
      drupal_goto('admin/structure/taxonomy/' . $form['#vocabulary']->machine_name . '//' . $form['#term']['tid'], $options);
      exit();
    }
  }
}

/**
 * Implementation of hook_permissions
 */
function tui_permission(){
  $permissions = array();
  foreach(taxonomy_get_vocabularies() as $vocabulary){
    $permissions += array(
      'add terms in ' . $vocabulary->vid => array(
        'title' => t('Edit terms in %vocabulary', array(
          '%vocabulary' => $vocabulary->name
        ))
      )
    );
  }
  return $permissions;
}

/**
 * Implementation of hook_form_FORM_ID_alter().
 */
function tui_form_taxonomy_overview_vocabularies_alter(&$form, &$form_state){
  // Tweak the links on the overview vocabulary page a little.
  $children = element_children($form);
  foreach ($children as $child) {
    if (is_numeric($child)) {
      if (isset($form[$child]['edit'])) {
        $form[$child]['edit']['#title'] = t('Settings');
      }
      if (isset($form[$child]['list'])) {
        $form[$child]['list']['#title'] = t('Edit terms');
      }
      if (isset($form[$child]['add'])) {
        $form[$child]['add']['#title'] = t('Add terms');
      }
    }
  }
}

/**
 * Implementation of hook_menu_alter()
 */
function tui_menu_alter(&$items){
  // Change the tab text, to reflect what we have done in the form alter above.
  $items['admin/structure/taxonomy/%taxonomy_vocabulary_machine_name/list']['title'] = 'Edit terms';
  $items['admin/structure/taxonomy/%taxonomy_vocabulary_machine_name/list']['weight'] = -10;
  $items['admin/structure/taxonomy/%taxonomy_vocabulary_machine_name/edit']['title'] = 'Settings';
  $items['admin/structure/taxonomy/%taxonomy_vocabulary_machine_name/edit']['weight'] = -20;
  // Change the add term page so that the link does not appear on the list terms
  // or TUI page (As a sub tab thingy, not the tab).
  $items['admin/structure/taxonomy/%taxonomy_vocabulary_machine_name/add']['type'] = 132;
  $items['admin/structure/taxonomy/%taxonomy_vocabulary_machine_name/add']['access callback'] = 'tui_access_callback';
  $items['admin/structure/taxonomy/%taxonomy_vocabulary_machine_name/add']['access arguments'] = array(
    3
  );
  // Change the "list terms" page to use the taxonomy editor instead.
  $items['admin/structure/taxonomy/%taxonomy_vocabulary_machine_name']['page callback'] = 'tui_hierarchy_page';
  $items['admin/structure/taxonomy/%taxonomy_vocabulary_machine_name']['page arguments'] = array(
    3
  );
  $items['admin/structure/taxonomy/%taxonomy_vocabulary_machine_name']['access callback'] = 'tui_access_callback';
  $items['admin/structure/taxonomy/%taxonomy_vocabulary_machine_name']['access arguments'] = array(
    3
  );
  $items['admin/structure/taxonomy/%taxonomy_vocabulary_machine_name']['file'] = 'tui.admin.inc';
  $items['admin/structure/taxonomy/%taxonomy_vocabulary_machine_name']['module'] = 'tui';
}

function tui_menu_local_tasks_alter(&$data, $router_item, $root_path){
  if((variable_get('reverse_proxy', FALSE) || (isset($_COOKIE['has_js']) && $_COOKIE['has_js'])) && $router_item['path'] == 'admin/structure/taxonomy/%'){
    foreach($data['tabs'] as $tab_group_index => $tab_group){
      foreach($tab_group['output'] as $key => $tab){
        if($tab['#link']['path'] == 'admin/structure/taxonomy/%/add'){
          $data['tabs'][$tab_group_index]['output'][$key]['#link']['href'] = 'admin/structure/taxonomy/' . arg(3) . '/hierarchy/form_callback/add-form/';
          $data['tabs'][$tab_group_index]['output'][$key]['#link']['localized_options'] = array(
            'attributes' => array(
              'class' => 'use-ajax',
              'id' => 'tui-add-tab-link'
            )
          );
        }
      }
    }
  }
}

/**
 * Access callback for TUI edit pages
 */
function tui_access_callback($vocabulary){
  // Only grant access to the page if they can add AND edit AND delete.
  return user_access('edit terms in ' . $vocabulary->vid) && user_access('delete terms in ' . $vocabulary->vid) && user_access('add terms in ' . $vocabulary->vid);
}

/**
 * Implementation of hook_help()
 */
function tui_help($path, $arg){
  switch($path){
    case 'admin/structure/taxonomy/%':
      $vocabulary = taxonomy_vocabulary_machine_name_load($arg[3]);
      return '<h1>' . t('Taxonomy User Interface') . '</h1>' . t('<p>Clicking a term\'s edit link from the taxonomy browser on the left, will bring up a form here.</p><p>Terms can be moved in the tree by simply dragging and dropping. Click the mouse on a term, ensuring you hold down the button, and then move it to where you would like the term. When moving a name, if you drag the term being moved over another term, then the term being moved will become a sibling of the other term. If you move the mouse to the right whilst over a term, then term will become a child of the other term. If you move the mouse to the left whilst over a term, then term will become a sibling of the parent of the other term.</p><p>Clicking on a term will mark this term and all its progeny in yellow.</p>');
  }
}

/**
 * Implementation of hook_library
 */
function tui_library(){
  return array(
    'ui.nestedSortable' => array(
      'title' => 'jQuery UI: nested Sortable',
      'website' => 'http://mjsarfatti.com/sandbox/nestedSortable/',
      'version' => '1.3.4',
      'js' => array(
        drupal_get_path('module', 'tui') . '/js/jquery.ui.nestedSortable.js' => array()
      ),
      'dependencies' => array(
        array(
          'system',
          'ui.sortable'
        )
      )
    )
  );
}

/**
 * Implementation of hook_theme().
 */
function tui_theme(){
  return array(
    'tui_page' => array(
      'variables' => array(
        'vocabulary' => NULL,
        'tids' => array(),
        'highlight_tids' => array()
      ),
      'file' => 'tui.theme.inc'
    ),
    'tui_branch' => array(
      'variables' => array(
        'vocabulary' => NULL,
        'tid' => 0,
        'tids' => array(),
        'highlight_tids' => array()
      ),
      'file' => 'tui.theme.inc'
    ),
    'tui_term' => array(
      'variables' => array(
        'vocabulary' => NULL,
        'term' => NULL,
        'tids' => array(),
        'highlight_tids' => array()
      ),
      'file' => 'tui.theme.inc'
    ),
    'tui_term_name' => array(
      'variables' => array(
        'term' => NULL,
        'highlight_tids' => array(),
        'vocabulary' => NULL
      ),
      'file' => 'tui.theme.inc'
    )
  );
}