<?php

/**
 * @file
 * TimelineJS module.
 */

/**
 * Implements hook_node_view().
 */
function timelinejs_node_view($node, $view_mode, $langcode) {
  if ($node->type == 'timeline' && $view_mode == 'full') {
    $node->content['timeline']['#markup'] = timelinejs($node->nid);
  }
}

/**
 * Implements hook_menu()
 */
function timelinejs_menu() {
  $items['timelinejs/json'] = array(
    'page callback'    => 'timelinejs_json',
    'access arguments' => array('access content'),
    'type'             => MENU_CALLBACK,
  );

  $items['timeline'] = array(
    'page callback'    => 'timelinejs',
    'access arguments' => array('access content'),
    'type'             => MENU_CALLBACK,
  );

  return $items;
}

/**
 * Implements hook_theme()
 */
function timelinejs_theme($existing, $type, $theme, $path) {
  return array(
    'timelinejs' => array(
      'template'  => 'timelinejs',
      'variables' => array(
        'width'         => NULL,
        'height'        => NULL,
        'source'        => NULL,
        'start_at_end'  => 'false',
        'hash_bookmark' => 'true',
        'css'           => NULL,
        'js'            => '/sites/all/libraries/timelinejs/compiled/js/timeline.js',
        'lang'          => NULL,
      ),
    ),
    'timelinejs_json' => array(
      'template'  => 'timelinejs_json',
      'variables' => array('headline', 'date', 'text', 'media', 'events'),
    ),
    'timelinejs_json_event' => array(
      'template'  => 'timelinejs_json_event',
      'variables' => array('event'),
    ),
  );
}

/**
 * Get a score nid from a timeline nid.
 */
function timelinejs_load_events($nid) {
  $query = db_select('field_data_field_timeline', 't');

  // Basic query.
  $query
    ->fields('t', array('entity_id'))
    ->condition('t.bundle', 'event')
    ->condition('t.field_timeline_target_id', $nid, '=');

  $result = $query->execute();

  return $result->fetchAll();
}

/**
 * Menu callback.
 */
function timelinejs_json($nid) {
  // Sanitization and basic data.
  $nid      = (int) $nid;
  $timeline = node_load($nid);
  $nodes    = timelinejs_load_events($nid);

  foreach ($nodes as $node) {
    $items[] = node_load($node->entity_id);
  }

  foreach ($items as $event) {
    $output[] = theme('timelinejs_json_event', array('event' => $event));
    $events   = implode(',', $output);
  }

  $text     = $media = NULL;
  $headline = $timeline->title;
  $date     = $timeline->field_date['und']['0']['value'];

  print theme('timelinejs_json', array(
    'headline' => $headline,
    'date'     => $date,
    'text'     => $text,
    'media'    => $media,
    'events'   => $events,
  ));

  # Avoid themable output.
  exit;
}

/**
 * Menu callback.
 *
 * @todo
 *   Check for a timeline.css in the current theme instead of using a hardcoded value.
 *   Dimensions should be configurable.
 */
function timelinejs($nid) {
  global $language;

  return theme('timelinejs', array(
    'width'  => '960px',
    'height' => '500px',
    'source' => '/timelinejs/json/'. (int) $nid,
    'css'    => '/sites/boletim/themes/boletimclean/timeline.css',
    'lang'   => '/sites/all/libraries/timelinejs/compiled/js/locale/'. $language->language .'.js',
  ));
}