<?php

/**
 * @file
 * Views Show More module.
 */

/**
 * Implements hook_views_api().
 */
function views_show_more_views_api() {
  return array(
    'api' => 3.0,
  );
}

/**
 * Implements hook_theme().
 */
function views_show_more_theme() {
  return array(
    'pager_show_more' => array(
      'variables' => array(
        'tags' => array(),
        'quantity' => 10,
        'element' => 0,
        'parameters' => array(),
      ),
    ),
  );
}

/**
 * Theme function for pager link generation.
 */
function theme_pager_show_more($vars) {
  global $pager_total;

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

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

  $pager_next = theme('pager_next',
    array(
      'text' => $vars['show_more_text'],
      'element' => $element,
      'interval' => 1,
      'parameters' => $parameters,
    )
  );
  if (empty($pager_next)) {
    $pager_next = empty($vars['show_more_empty_text']) ? '&nbsp;' : check_plain($vars['show_more_empty_text']);
    $pager_classes[] = 'pager-show-more-empty';
  }

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

/**
 * Implements hook_views_ajax_data_alter().
 */
function views_show_more_views_ajax_data_alter(&$commands, $view) {
  // Checking views have result or not.
  if (!$view->total_rows) {
    return;
  }

  $pager = $view->query->pager;
  $style_plugin = $view->style_plugin;
  if ($pager instanceof ViewsShowMorePlugin) {
    // Checking current page number if 1st page then no action.
    if ($pager->current_page == 0) {
      return;
    }
    foreach ($commands as $key => $command) {
      // Remove "viewsScrollTop" command, not needed.
      if ($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-' . $view->dom_id) {
        if ($style_plugin->plugin_name == 'list' && in_array($style_plugin->options['type'], array('ul', 'ol'))) {
          if (empty($style_plugin->options['wrapper_class'])) {
            $target = "> {$style_plugin->options['type']}:not(.links)";
          }
          else {
            $wrapper_classes = str_replace(' ', '.', $style_plugin->options['wrapper_class']);
            $target = ".{$wrapper_classes} > {$style_plugin->options['type']}:not(.links)";
          }
          $commands[$key]['append_at'] = $target;
        }
        elseif ($style_plugin->plugin_name == 'table') {
          $commands[$key]['append_at'] = '.views-table tbody';
        }
        elseif ($style_plugin->plugin_name == 'grid') {
          $commands[$key]['append_at'] = '.views-view-grid tbody';
        }

        $commands[$key]['command'] = 'viewsShowMore';
        $commands[$key]['method'] = $pager->options['result_display_method'];
        if (isset($pager->options['effects']) && $pager->options['effects']['type'] != 'none') {
          $commands[$key]['effect'] = $pager->options['effects']['type'];
          $commands[$key]['speed'] = $pager->options['effects']['speed'];
        }
        $commands[$key]['options'] = array(
          'content_selector' => $pager->options['advance']['content_selector'],
          'pager_selector' => $pager->options['advance']['pager_selector'],
        );
      }
    }
  }
}

/**
 * Implements hook_views_pre_render().
 */
function views_show_more_views_pre_render(&$view) {
  // Load js file only if ajax is enabled.
  if (!$view->use_ajax) {
    return;
  }
  drupal_add_js(drupal_get_path('module', 'views_show_more') . '/views_show_more.js');
}

/**
 * Implements custom element validate helper.
 */
function views_show_more_integer_positive($element, &$form_state) {
  $value = $element ['#value'];
  if ($value !== '' && (!is_numeric($value) || intval($value) != $value || $value < 0)) {
    form_error($element, t('%name must be a positive integer.', array('%name' => $element ['#title'])));
  }
}