<?php
// $Id: nodeformcols.module,v 1.7 2009/09/21 06:09:54 hugowetterberg Exp $
define('NODEFORMCOLS_DEFAULT_REGION', 'main');

/**
 * Implementation of hook_theme().
 */
function nodeformcols_theme($aExisting) {
  return array(
    // This needs to run after node.module's hook_theme(), which we ensure
    // by setting this module's weight to 1 during install.
    'node_form' => array(
      'template' => 'node-form',
    ),
    'nodeformcols_configuration' => array(
      'template' => 'nodeformcols-configuration',
      'arguments' => array('element' => array()),
    ),
  );
}

/**
 * Implementation of hook_menu().
 */
function nodeformcols_menu() {
  $items = array();

  if (!defined('MAINTENANCE_MODE')) {
    foreach (node_get_types() as $type) {
      $type_name = $type->type;
      $type_url_str = str_replace('_', '-', $type_name);
      $items['admin/content/node-type/'. $type_url_str .'/form'] = array(
        'title' => 'Manage form',
        'page callback' => 'drupal_get_form',
        'page arguments' => array('nodeformcols_configuration_form', $type_name, 5),
        'access arguments' => array('administer content types'),
        'file' => 'nodeformcols.admin.inc',
        'type' => MENU_LOCAL_TASK,
        'weight' => 3
      );
    }
  }

  return $items;
}

/**
 * Implementation of hook_ctools_plugin_directory().
 */
function nodeformcols_ctools_plugin_directory($module, $plugin) {
  if ($module == 'ctools') {
    return 'plugins/' . $plugin;
  }
}

function nodeformcols_form_regions() {
  return array(
    'main' => t('Main column'),
    'right' => t('Right'),
    'footer' => t('Footer'),
  );
}

/**
 * Gets default placements for standard fields
 *
 * @return array
 */
function _nodeformscols_default_field_placements() {
  return array(
    'title' => array('region' => 'main'),
    'body_field' => array('region' => 'main'),
    'menu' => array('region' => 'right'),
    'revision_information' => array('region' => 'right'),
    'comment_settings' => array('region' => 'right'),
    'path' => array('region' => 'right'),
    'options' => array('region' => 'right'),
    'author' => array('region' => 'right'),
    'buttons' => array('region' => NODEFORMCOLS_DEFAULT_REGION, 'weight' => 100),
  );
}

function nodeformscols_field_placements($content_type, $variant) {
  $default = _nodeformscols_default_field_placements();
  if ($variant != 'default') {
    $default = variable_get('nodeformscols_field_placements_' .
      $content_type . '_default', $default);
  }

  $placements = variable_get('nodeformscols_field_placements_' . $content_type .
    '_' . $variant, $default);

  return $placements;
}

function nodeformscols_content_extra_fields($type_name, $variant) {
  return array(
    'buttons' => array(
      '#title' => t('Buttons'),
      '#description' => t('Save, preview and delete buttons.'),
      '#weight' => 50,
    ),
    'options' => array(
      '#title' => t('Workflow options'),
      '#description' => t('Options for publishing, sticky and publish on front page.'),
      '#weight' => 0,
    ),
  );
}

/**
 * Implementation of hook_form_alter().
 */
function nodeformcols_form_alter(&$form, $form_state, $form_id) {
  if ('node-form' == $form['#id']) {
    drupal_alter('nodeformcols_pre_form', $form);
    $variant = isset($form['#nodeformcols_variant']) ? $form['#nodeformcols_variant'] : 'default';
    $placements = nodeformscols_field_placements($form['#node']->type, $variant);
    foreach ($placements as $key => $p) {
      if (isset($p['hidden']) && $p['hidden']) {
        $form[$key]['#access'] = FALSE;
      }
    }
    drupal_alter('nodeformcols_post_form', $form);
  }
}

/**
 * Preprocess function to run ahead of other modules.
 */
function template_preprocess_node_form(&$aVars) {
  drupal_add_css(drupal_get_path('module', 'nodeformcols') . '/css/nodeformcols.css');

  $default_region = variable_get('nodeformcols_default_region', NODEFORMCOLS_DEFAULT_REGION);
  $form = &$aVars['form'];
  $class = array('node-form');

  $regions = array();
  $has_elements = array();
  $weight = 0;
  foreach (nodeformcols_form_regions() as $name => $title) {
    $regions[$name] = array(
      '#prefix' => '<div class="form-region-' . $name . '">',
      '#suffix' => '</div>',
      '#weight' => $weight,
    );
    $weight++;
  }

  drupal_alter('nodeformcols_pre_placement', $form);
  $variant = isset($form['#nodeformcols_variant']) ? $form['#nodeformcols_variant'] : 'default';
  $placements = nodeformscols_field_placements($form['#node']->type, $variant);

  // Track if new fields should be adjusted above the buttons.
  // TODO: This should be generalized to a way to tell nodeformcols where to place new fields (above below field X).
  $adjust_to_buttons = $placements['buttons']['region'] == $default_region;

  foreach ($form as $key => $field) {
    if (substr($key, 0, 1)=='#' ||
        $field['#type']=='value' || $field['#type']=='hidden'|| $field['#type']=='token') {
      continue;
    }

    if (isset($placements[$key])) {
      $p = $placements[$key];

      if (isset($p['weight'])) {
        $field['#weight'] = $p['weight'];
      }
      if (isset($p['collapsed']) && isset($field['#collapsible']) && $field['#collapsible']) {
        $field['#collapsed'] = $p['collapsed'];
      }
      $regions[$p['region']][$key] = $field;
      $has_elements[$p['region']] = TRUE;
      unset($form[$key]);
    }
    else { // Set the default placement for unknown fields
      $regions[$default_region][$key] = $field;
      if ($adjust_to_buttons && $regions[$default_region][$key]['#weight'] >= $placements['buttons']['weight']) {
        $regions[$default_region][$key]['#weight'] = $placements['buttons']['weight'] - .1;
      }
      $has_elements[$default_region] = TRUE;
      unset($form[$key]);
    }
  }

  // Ensure that we have the footer wrapper so that
  // we clear the floating columns
  if (!$has_elements['footer']) {
    $has_elements['footer'] = TRUE;
    $regions['footer'][] = array(
      '#type' => 'markup',
      '#value' => '&nbsp;',
    );
  }

  foreach ($has_elements as $name => $has) {
    if ($has) {
      $class[] = 'node-form-has-region-' . $name;
      $form['nodeformcols_region_' . $name] = $regions[$name];
    }
  }

  $aVars['class'] = join($class, ' ');
}

/**
 * Implementation of hook_node_type().
 */
function nodeformcols_node_type($op, $info) {
  switch ($op) {
    case 'delete':
      db_query("DELETE FROM {variable} WHERE name LIKE '%s'", array(
        ':name' => 'nodeformscols_field_placements_'. $info->type . '%',
      ));
      break;
    case 'update':
      if (!empty($info->old_type) && $info->old_type != $info->type) {
        $base = 'nodeformscols_field_placements_'. $info->old_type;
        $new_base = 'nodeformscols_field_placements_'. $info->type;
        $res = db_query("SELECT name FROM {variable} WHERE name LIKE '%s'", array(
          ':name' => $base . '%',
        ));

        while ($old_name = db_result($res)) {
          $new_name = str_replace($base, $new_base, $old_name);
          db_query("UPDATE {variable} SET name='%s' WHERE name='%s'", array(
            ':new' => $new_name,
            ':old' => $old_name,
          ));
        }
        cache_clear_all('variables', 'cache');
      }
      break;
  }
}