<?php
/**
 * @file
 * Bootstrap integration.
 */

/**
 * Implements hook_views_api().
 */
function views_bootstrap_views_api() {
  return array("api" => "3.0");
}

/**
 * Distribute items in rows/columns as required for horizontal alignment.
 *
 * @param array $rows The rendered views result rows.
 * @param int $nb_columns The desired number of columns per row.
 *
 * @return array A multi-dimensional array with the calculated rows and columns.
 */
function _views_bootstrap_split_rows_horizontal($results, $nb_columns) {
  $col = 0;
  $row = 0;
  $items = array();

  // Iterate over each rendered views result row.
  foreach ($results as $item) {
    // Add the item.
    $items[$row]['content'][$col]['content'] = $item;

    // If we've reached the maximum number of columns per row, reset the column
    // index and proceed to the next row.
    if ($col == ($nb_columns - 1)) {
      $col = 0;
      $row++;
    }
    // Otherwise, proceed to the next column.
    else {
      $col++;
    }
  }

  return $items;
}

/**
 * Distribute items in columns as required for vertical alignment.
 *
 * @param array $rows The rendered views result rows.
 * @param int $nb_columns The desired number of columns per row.
 *
 * @return array A multi-dimensional array with the calculated columns.
 */
function _views_bootstrap_split_rows_vertical($rows, $nb_columns) {
  $col = 0;
  $row = 0;
  $items = array();
  $remainders = count($rows) % $nb_columns;
  $num_rows = floor(count($rows) / $nb_columns);

  // Iterate over each rendered views result row.
  foreach ($rows as $item) {
    // Add the item.
    $items[$col]['content'][$row]['content'] = $item;

    // Increase, decrease or reset appropriate integers.
    $row++;
    if (!$remainders && $row == $num_rows) {
      $row = 0;
      $col++;
    }
    elseif ($remainders && $row == $num_rows + 1) {
      $row = 0;
      $col++;
      $remainders--;
    }
  }

  return $items;
}

/**
 * View preprocessing that prepares the results as a Bootstrap grid.
 *
 * Depending on the options selected on the style plugin handler, this function
 * distributes the results into rows and columns, calculates where clearfix divs
 * should be added (if applicable), and prepares the bootstrap classes that
 * should be added to each column.
 *
 * Used by the Bootstrap Grid and Bootstrap Thumbnail plugins.
 *
 * @see template_preprocess_views_bootstrap_grid_plugin_style().
 * @see template_preprocess_views_bootstrap_thumbnail_plugin_style().
 */
function _views_bootstrap_preprocess_views_style_plugin_prepare_grid(&$vars) {
  $options = $vars['view']->style_plugin->options;

  // Prepare column css classes. Add the class for each device size if set and if
  // different than 0 ("Do not define" option).
  $col_classes = explode(' ', $options['column_class']);
  foreach (array('xs', 'sm', 'md', 'lg') as $size) {
    if (!empty($options["columns_$size"])) {
      $col_classes[] = 'col-' . $size . '-' . $options["columns_$size"];
    }
  }
  $vars['col_classes'] = join(' ', $col_classes);

  if ($options['alignment'] === 'horizontal') {
    _views_bootstrap_preprocess_views_style_plugin_prepare_grid_horizontal($vars);
    return;
  }

  _views_bootstrap_preprocess_views_style_plugin_prepare_grid_vertical($vars);
}

/**
 * Further preprocessing for horizontal alignment.
 * @see _views_bootstrap_preprocess_views_style_plugin_prepare_grid().
 */
function _views_bootstrap_preprocess_views_style_plugin_prepare_grid_horizontal(&$vars) {
  $options = $vars['view']->style_plugin->options;

  // If columns are set to 0 (Auto), apply the maximum from the number of columns
  // defined per device size.
  if (!$options['columns_horizontal']) {
    $options['columns_horizontal'] = 1;
    foreach (array('xs', 'sm', 'md', 'lg') as $size) {
      if (isset($options["columns_$size"]) && $options["columns_$size"] > 0) {
        $tmpColumns = 12 / $options["columns_$size"];
        if ($tmpColumns > $options['columns_horizontal']) {
          $options['columns_horizontal'] = $tmpColumns;
        }
      }
    }
  }

  // Distribute items in rows and columns.
  $vars['items'] = _views_bootstrap_split_rows_horizontal($vars['rows'], $options['columns_horizontal']);

  // If the number of columns is set to -1 ("Single row" option), calculate the
  // number of columns after which the clearfix divs should be placed for each
  // screen size. No clearfix is necessary for large screens (lg) and when the
  // size of the column is 12 (full row).
  if ($options['columns_horizontal'] == -1) {
    $vars['clearfix'] = array();
    foreach (array('xs', 'sm', 'md', 'lg') as $size) {
      if (!empty($options["columns_$size"]) && $options["columns_$size"] != 12) {
        $vars['clearfix'][$size] = 12 / $options["columns_$size"];
      }
    }
  }
}

/**
 * Further preprocessing for vertical alignment.
 * @see _views_bootstrap_preprocess_views_style_plugin_prepare_grid().
 */
function _views_bootstrap_preprocess_views_style_plugin_prepare_grid_vertical(&$vars) {
  $options = $vars['view']->style_plugin->options;

  // Distribute items in rows and columns.
  $vars['items'] = _views_bootstrap_split_rows_vertical($vars['rows'], $options['columns_vertical']);
}