<?php

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

/**
 * Implements hook_node_view()
 */
function timelinejs_node_view($node, $view_mode, $langcode) {
  if ($node->type == 'timeline' && $view_mode == 'full') {
    if (isset($node->nid)) {
      $node->content['timeline']['#markup'] = timelinejs($node->nid);
    }
    else {
      $node->content['timeline']['#markup'] = t('Timeline will be rendered just after saving it.');
    }

    $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,
  );

  $items['widgets/timeline'] = array(
    'page callback'    => 'timelinejs_widget',
    '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(
        'module_path'   => drupal_get_path('module', 'timelinejs'),
        'nid'           => NULL,
        'width'         => NULL,
        'height'        => NULL,
        'source'        => NULL,
        'start_at_end'  => 'false',
        'hash_bookmark' => 'true',
        'css'           => NULL,
        'js'            => '/' . timelinejs_library_path() . '/compiled/js/timeline.js',
        'font'          => NULL,
        'lang'          => NULL,
        'lang_js'       => NULL,
      ),
    ),
    'timelinejs_embed' => array(
      'template'  => 'timelinejs_embed',
      'variables' => array(
        'nid'           => NULL,
        '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', 'date_format'),
    ),
    'timelinejs_print' => array(
      'template'  => 'timelinejs_print',
      'variables' => array('headline', 'date', 'text', 'media', 'events'),
    ),
    'timelinejs_print_event' => array(
      'template'  => 'timelinejs_print_event',
      'variables' => array('event', 'date_format'),
    ),
  );
}

/**
 * Determine the library path.
 */
function timelinejs_library_path() {
  // We have to use "timeline" instead of "timelinejs" because of
  // this issue: https://github.com/VeriteCo/TimelineJS/issues/403
  return libraries_get_path('timeline');
}

/**
 * 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);

  if (isset($timeline->field_date_format['und'][0]['value'])) {
    $date_format = check_plain($timeline->field_date_format['und'][0]['value']);
  }
  else {
    $date_format = '%Y,%m,%d';
  }

  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, 'date_format' => $date_format));
    if ($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($nid) {
  header('Content-type: application/json; charset=utf-8', true);
  print theme('timelinejs_json', timelinejs_fetch_items($nid));

  // Avoid themable output.
  exit;
}

/**
 * Menu callback.
 */
function timelinejs_widget($nid = NULL, $width = '960px', $height = '500px') {
  // Check parameters.
  if ($nid == NULL) {
    print t('Page not found');
    exit;
  }
  else {
    $node = node_load($nid);

    if ($node == FALSE) {
      print t('Page not found');
      exit;
    }
  }

  // Format output and include timeline.
  $output  = '<!DOCTYPE html>';
  $output .= '<meta http-equiv="Content-Type" content="text/html; charset=utf-8">';
  $output .= '<html style="height: 100%;"><head>';
  $output .= '<title>' . t('Timeline: @title', array('@title' => $node->title)) . '</title>';
  $output .= '<script type="text/javascript">timelineWidget = true;</script>';
  $output .= '</head><body class="widget timeline-widget" style="height: 100%; margin: 0px;">';
  $output .= timelinejs($nid, $width, $height, FALSE);
  $output .= '</body></html>';

  // Avoid themeable output.
  print $output;
  exit;
}

/**
 * Menu callback.
 */
function timelinejs($nid = NULL, $width = '960px', $height = '600px', $embed = TRUE) {
  global $language;
  global $theme;
  global $base_url;

  if ($nid == NULL) {
    drupal_not_found();
  }

  $node         = node_load($nid);
  $theme_path   = drupal_get_path('theme', $theme);
  $library_path = timelinejs_library_path();

  // Determine stylesheet
  if (file_exists($theme_path . '/timeline.css')) {
    $css = '/' . $theme_path . '/timeline.css';
  }
  else {
    $css = '/' . $library_path . '/compiled/css/timeline.css';
  }

  // Determine data source
  if (isset($node->field_source['und'][0]['value'])) {
    $source = $node->field_source['und'][0]['value'];
  }
  else {
    $source = $base_url . '/timelinejs/json/' . (int) $nid;
  }

  // Determine dimensions
  if ($width == 'full') {
    $width = '100%';
  }

  if ($height == 'full') {
    $height = '100%';
  }

  $output = theme('timelinejs', array(
    'nid'          => $nid,
    'lang'         => $language->language,
    'width'        => $width,
    'height'       => $height,
    'source'       => $source,
    'css'          => $css,
    // Use timelinejs from CDN until we fix it's direct inclusion
    // See https://gitlab.com/socioambiental/widgets/issues/2
    'js'           => 'https://cdn.knightlab.com/libs/timeline/latest/js/timeline-min.js',
    //'js'         => '/' . $library_path . '/compiled/js/timeline-min.js',
    'lang_js'      => '/' . $library_path . '/compiled/js/locale/' . $language->language . '.js',
    'font'         => variable_get('timelinejs_font', 'Bevan-PotanoSans'),
    'library_path' => $library_path,
  ));

  if ($embed) {
    $output .= theme('timelinejs_embed', array(
      'nid'  => $nid,
      'lang' => $language->language,
    ));
  }

  return $output;
}

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

/**
 * Strip text so it can be used inside json templates.
 */
function timelinejs_strip($string) {
  return str_replace(array("\r\n", "\n", "\r"), '<br>', str_replace('"', "'", $string));
}