<?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);
    $node->content['timeline']['#weight'] = -1;
  }
}

/**
 * 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'),
    ),
    'timelinejs_print' => array(
      'template'  => 'timelinejs_print',
      'variables' => array('headline', 'date', 'text', 'media', 'events'),
    ),
    'timelinejs_print_event' => array(
      'template'  => 'timelinejs_print_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();
}

/**
 * Load all events from a timeline.
 */
function timelinejs_fetch_items($nid, $format = 'json') {
  // 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);
  }

  if (empty($items)) {
    $items[0]                                = new stdClass();
    $items[0]->field_date['und'][0]['value'] = NULL;
    $items[0]->title                         = t('No items');
    $items[0]->body['und'][0]['value']       = t('Currently there are no items in this timeline.');
  }

  foreach ($items as $event) {
    if (!isset($event->body['und'])) {
      $event->body['und'] = NULL;
    }

    $output[] = theme('timelinejs_'. $format .'_event', array('event' => $event));
    if ($format == 'json') {
      $events   = implode(',', $output);
    }
    else {
      $events   = implode($output);
    }
  }

  $text     = $media = NULL;
  $headline = $timeline->title;
  $date     = NULL;

  return array(
    'headline' => $headline,
    'date'     => $date,
    'text'     => $text,
    'media'    => $media,
    'events'   => $events,
  );
}

/**
 * Menu callback.
 */
function timelinejs_json($nid) {
  print theme('timelinejs_json', timelinejs_fetch_items($nid));

  # Avoid themable output.
  exit;
}

/**
 * Menu callback.
 */
function timelinejs($nid, $width = '960px', $height = '500px') {
  global $language;
  global $theme;
  global $base_url;

  $theme_path   = drupal_get_path('theme', $theme);
  $library_path = drupal_get_path('libraries', 'timelinejs');

  $css = (file_exists($theme_path .'/timeline.css')) ? '/'. $theme_path .'/timeline.css' : '/'. $library_path .'/compiled/css/timeline.css';

  return theme('timelinejs', array(
    'width'  => $width,
    'height' => $height,
    'source' => $base_url .'/timelinejs/json/'. (int) $nid,
    'css'    => $css,
    'lang'   => '/sites/all/libraries/timelinejs/compiled/js/locale/'. $language->language .'.js',
  ));
}

/**
 * Menu callback.
 */
function timelinejs_print($nid) {
  return theme('timelinejs_print', timelinejs_fetch_items($nid, 'print'));
}