<?php

/**
 * @file views_load_more.module
 *
 * A Views pager module to allow new content to be appended to the bottom
 * of a view instead of replacing it.
 */

/**
 * Implementation of hook_views_api().
 */
function views_load_more_views_api() {
  return array('api' => '3.0-alpha1');
}

// We need to implement our own tpls for items being return via the load-more pager.

/**
 * Implementation of hook_theme().
 */
function views_load_more_theme() {
  return array(
    'views_load_more_pager' => array(
      'variables' => array('tags' => array(), 'quantity' => 10, 'element' => 0, 'parameters' => array()),
      'pattern' => 'views_load_more_pager__',
    ),
  );
}

/**
 * Implements hook_views_ajax_data_alter().
 */
function views_load_more_views_ajax_data_alter(&$commands, $view) {
  // Support No results behavior.
  if (!$view->total_rows) {
    return;
  }

  if (is_a($view->query->pager, 'views_plugin_pager_load_more')) {
    // This is a work-around for allowing exposed for on the page.
    if ($view->query->pager->current_page == 0) {
      return;
    }
    foreach ($commands as $key => $command) {
      // remove "viewsScrollTop" command, as this behavior is unnecessary.
      if ($command['command'] == 'viewsScrollTop') {
        unset($commands[$key]);
      }
      // the replace should the only one, but just in case, we'll make sure.
      if ($command['command'] == 'insert' && $command['selector'] == '.view-dom-id-' . $view->dom_id) {
        if ($view->style_plugin->plugin_name == 'list' && in_array($view->style_plugin->options['type'], array('ul', 'ol'))) {
          if (empty($view->style_plugin->options['wrapper_class'])) {
            $target = "> {$view->style_plugin->options['type']}:not(.links)";
          }
          else {
            $wrapper_classes = explode(' ', $view->style_plugin->options['wrapper_class']);
            $wrapper_classes = implode('.', $wrapper_classes);
            $target = ".{$wrapper_classes} > {$view->style_plugin->options['type']}:not(.links)";
          }
          $commands[$key]['targetList'] = $target;
        }
        else if ($view->style_plugin->plugin_name == 'table') {
          $commands[$key]['targetList'] = '.views-table tbody';
        }

        $commands[$key]['command'] = 'viewsLoadMoreAppend';
        $commands[$key]['method'] = 'append';
        if (isset($view->query->pager->options['effects']) && $view->query->pager->options['effects']['type'] != 'none') {
          $commands[$key]['effect'] = $view->query->pager->options['effects']['type'];
          $commands[$key]['speed'] = $view->query->pager->options['effects']['speed'];
        }
        $commands[$key]['options'] = array(
          // @todo change to content_selector
          'content' => $view->query->pager->options['advance']['content_class'],
          'pager_selector' => $view->query->pager->options['advance']['pager_selector'],
        );
      }
    }
  }
}

function theme_views_load_more_pager($vars) {
  global $pager_page_array, $pager_total;

  $tags = $vars['tags'];
  $element = $vars['element'];
  $parameters = $vars['parameters'];

  $pager_classes = array('pager', 'pager-load-more');

  $li_next = theme('pager_next',
    array(
      'text' => (isset($tags[3]) ? $tags[3] : t($vars['more_button_text'])),
      'element' => $element,
      'interval' => 1,
      'parameters' => $parameters,
    )
  );
  if (empty($li_next)) {
    $li_next = empty($vars['more_button_empty_text']) ? '&nbsp;' : t($vars['more_button_empty_text']);
    $pager_classes[] = 'pager-load-more-empty';
  }
  // Compatibility with tao theme's pager
  elseif (is_array($li_next) && isset($li_next['title'], $li_next['href'], $li_next['attributes'], $li_next['query'])) {
    $li_next = l($li_next['title'], $li_next['href'], array('attributes' => $li_next['attributes'], 'query' => $li_next['query']));
  }

  if ($pager_total[$element] > 1) {
    $items[] = array(
      'class' => array('pager-next'),
      'data' => $li_next,
    );
    return theme('item_list',
      array(
        'items' => $items,
        'title' => NULL,
        'type' => 'ul',
        'attributes' => array('class' => $pager_classes),
      )
    );
  }
}

/**
 * Implements hook_views_pre_render().
 *
 * Load js file only if ajax is enabled.
 */
function views_load_more_views_pre_render(&$view) {
  if (!$view->use_ajax) {
    return;
  }

  drupal_add_js(drupal_get_path('module', 'views_load_more') . '/views_load_more.js');
}