<?php
// $Id$

/**
 * @file
 * Enable the creation of dynamic loading carousel widgets with views.
 */

/**
 * Implementation of hook_menu().
 */
function viewscarousel_menu($may_cache) {
  if ($may_cache) {
    $items[] = array(
      'path' => 'viewscarousel/js',
      'callback' => 'viewscarousel_js',
      'access' => user_access('access content'),
    );
  }
  else {
    foreach (viewscarousel_get_views() as $name => $view) {
      $items[] = array(
        'path' => $view->url .'/view',
        'title' => t('View'),
        'callback' => 'views_view_page',
        'access' => user_access('access content'),
        'weight' => -10,
        'type' => MENU_DEFAULT_LOCAL_TASK,
      );
      $items[] = array(
        'path' => $view->url .'/viewscarousel',
        'title' => t('Carousel setup'),
        'description' => t('Carousel setup.'),
        'access' => user_access('administer content'),
        'callback' => 'drupal_get_form',
        'callback arguments' => array('viewscarousel_setup_form', $name),
        'type' => MENU_LOCAL_TASK,
        'weight' => 5,
      );
    }
  }
  return $items;
}

/**
 * Implementation of hook_form_alter(). Add carousel settings to block
 * views, on Drupal's block configuration form.
 */
function viewscarousel_form_alter($form_id, &$form) {
  if ($form_id == 'block_admin_configure' && $form['module']['#value'] == 'views' && array_key_exists($form['delta']['#value'], viewscarousel_get_views('block'))) {
    $form['carousel_settings'] = array(
      '#type' => 'fieldset',
      '#title' => 'Carousel settings',
      '#collapsible' => TRUE,
      '#weight' => -1,
    );
    $form['carousel_settings'] += viewscarousel_setup_form($form['delta']['#value'], TRUE);
    $form['#submit']['viewscarousel_setup_form_submit'] = array();
  }
}

/**
 * Generate carousel configuration form.
 */
function viewscarousel_setup_form($view_name, $is_block = FALSE) {
  $settings = viewscarousel_get_settings($view_name);
  $form['carousel_settings'] = array('#tree' => TRUE);
  $form['carousel_settings']['orientation'] = array(
    '#title' => t('Orientation'),
    '#default_value' => $settings['orientation'],
    '#type' => 'select',
    '#options' => array('vertical' => t('Vertical'), 'horizontal' => t('Horizontal')),
  );
  $form['carousel_settings']['visible_items'] = array(
    '#title' => t('Visible items'),
    '#type' => 'textfield',
    '#default_value' => $settings['visible_items'],
    '#description' => t('The number of items that will be visible.')
  );
  $form['carousel_settings']['scroll_items'] = array(
    '#title' => t('Scroll items'),
    '#type' => 'textfield',
    '#default_value' => $settings['scroll_items'],
    '#description' => t('The number of items to scroll by.')
  );
  $form['carousel_settings']['auto_scroll'] = array(
    '#title' => t('Auto scroll'),
    '#type' => 'textfield',
    '#default_value' => $settings['auto_scroll'],
    '#description' => t('Specifies how many seconds to periodically auto scroll the content. If set to 0 then auto scroll is turned off.')
  );
  $form['carousel_settings']['item_width'] = array(
    '#title' => t('Item width'),
    '#type' => 'textfield',
    '#default_value' => $settings['item_width'],
    '#description' => t('Item width in pixels. Pass this, if you want the items set to the specified width. Otherwise, the assigned css value is used.')
  );
  $form['carousel_settings']['item_height'] = array(
    '#title' => t('Item height'),
    '#type' => 'textfield',
    '#default_value' => $settings['item_height'],
    '#description' => t('Item height in pixels. Pass this, if you want the items set to the specified height. Otherwise, the assigned css value is used.')
  );
  $form['carousel_settings']['wrap'] = array(
    '#type' => 'checkbox',
    '#title' => t('Wrap'),
    '#return_value' => TRUE,
    '#default_value' => $settings['wrap'],
    '#description' => t('Specifies whether to wrap at the last item and jump back to the start.'),
  );
  $form['view_name'] = array('#type' => 'value', '#value' => $view_name);

  // If we aren't configuring a block, add a submit button.
  if (!$is_block) {
    $form['submit'] = array(
      '#type' => 'submit',
      '#value' => t('Submit'),
    );
  }

  return $form;
}

/**
 * Save carousel settings.
 */
function viewscarousel_setup_form_submit($form_id, $form_values) {
  variable_set('carousel_'. $form_values['view_name'], $form_values['carousel_settings']);
}

/**
 * Return url of all page views that are of the type 'carousel'.
 */
function viewscarousel_get_views($type = 'page', $reset = FALSE) {
  static $views;
  if (is_null($views[$type]) || $reset) {
    $views[$type] = array();
    $where = ($type == 'page') ? "page = 1 AND page_type = 'carousel'" : "block = 1 AND block_type = 'carousel'";
    $result = db_query("SELECT name, url FROM {view_view} WHERE $where ORDER BY name");
    while ($row = db_fetch_object($result)) {
      $views[$type][$row->name] = $row;
    }
  }
  return $views[$type];
}

/**
 *  Implementation of hook_views_style_plugins()
 */
function viewscarousel_views_style_plugins() {
  $plugins = array();
  $plugins['carousel'] = array(
    'name' => t('Carousel'),
    'theme' => 'viewscarousel_display',
    'summary_theme' => 'viewscarousel_display',
    'validate' => 'viewscarousel_validate',
    'needs_fields' => TRUE,
    'needs_table_header' => FALSE,
  );

  return $plugins;
}

/**
 * Return settings for the given carousel.
 */
function viewscarousel_get_settings($view_name) {
  $defaults = array(
    'orientation' => 'horizontal',
    'visible_items' => 3,
    'scroll_items' => 2,
    'auto_scroll' => 0,
    'item_width' => '',
    'item_height' => '',
    'wrap' => FALSE,
    'first_node' => TRUE,
  );
  return array_merge($defaults, variable_get('carousel_'. $view_name, array()));
}

/**
 *  Theme a carousel.
 */
function theme_viewscarousel_display(&$view, &$nodes, $type) {
  $path = drupal_get_path('module', 'viewscarousel');
  drupal_add_js($path .'/jquery.jcarousel.pack.js');
  drupal_add_js($path .'/viewscarousel.js');
  drupal_add_css($path .'/viewscarousel.css');

  $id = 'viewscarousel-'. $view->name;

  $settings = viewscarousel_get_settings($view->name);

  // If total_rows is not set, i.e. pager is set to FALSE or this is
  // not a page view, get the view query in order to get total_rows.
  if (isset($view->total_rows)) {
    $total_rows = $view->total_rows;
  }
  else {
    // Maybe there is a better way to do this, e.g. not using a
    // 'private' views function.
    $query = _views_get_query($view, $views->argument, $views->filter);
    $count_query = db_rewrite_sql($query['countquery'], 'node', 'nid', $query['rewrite_args']);
    $total_rows = db_result(db_query($count_query));
  }

  $settings += array('view' => $view->name, 'total' => $total_rows);

  drupal_add_js(array('viewscarousel' => array($id => $settings)), 'setting');

  $fields = _views_get_fields();

  $output = '';

  if ($settings['first_node']) {
    $node = array_shift($nodes);
    $node = node_load($node->nid);
    $output .= '<div class="viewscarousel-node" id="'. $id .'">';
    $output .= node_view($node);
    $output .= '</div>';
  }

  $output .= '<div class="viewscarousel viewscarousel-'. $settings['orientation'] .'" id="'. $id .'">';
  $items = array();
  foreach ($nodes as $node) {
    $items[] = theme('viewscarousel_item', $fields, $node, $view);
  }
  $output .= theme('item_list', $items);
  $output .= '</div>';

  return $output;
}

/**
 *  Theme a carousel item.
 */
function theme_viewscarousel_item(&$fields, &$node, &$view) {
  $output = '';
  foreach ($view->field as $field) {
    if ($fields[$field['id']]['visible'] !== FALSE) {
      $output .= '<div class="view-field '. views_css_safe('view-field-'. $field['field']) .'">';
      if (!empty($field['label'])) {
        $output .= '<span class="view-field-lable">'. $field['label'] .'</span> ';
      }
      $output .= '<span class="view-field-value">'. views_theme_field('views_handle_field', $field['queryname'], $fields, $field, $node, $view) .'</span>';
      $output .= '</div>';
    }
  }

  return $output;
}

/**
 * Fetches the view and returns formated views.
 */
function viewscarousel_js() {
  $view = views_get_view($_GET['view']);

  $nodes_per_page = ($view->build_type == 'page') ? $view->nodes_per_page : $view->nodes_per_block;

  // TODO: handle views arguments.
  $items = views_build_view('items', $view, array(), TRUE, $nodes_per_page);
  $fields = _views_get_fields();

  // Render views items.
  $data = array();
  foreach ($items['items'] as $item) {
    $data[] = theme('viewscarousel_item', $fields, $item, $view);
  }

  print drupal_to_js(array('data' => $data));
  exit();
}