<?php
/**
 * @file
 * Admin functions for the paragraphs module.
 */

/**
 * Page callback to show the bundle overview page.
 *
 * @return null|string
 *   Rendered table of bundles.
 *
 * @throws Exception
 */
function paragraphs_admin_bundle_overview() {
  $page = array();
  $bundles = paragraphs_bundle_load();
  $field_ui = module_exists('field_ui');

  $header = array(
    t('Bundle name'),
    array('data' => t('Operations'), 'colspan' => $field_ui ? '4' : '2')
  );
  $rows = array();
  foreach ($bundles as $bundle) {

    $type_url_str = strtr($bundle->bundle, array('_' => '-'));

    $row = array(
      array(
        'data' => $bundle->name . ' (' . $bundle->bundle . ')',
      )
    );

    if ($field_ui) {

      // Manage fields.
      $row[] = array(
        'data' => l(t('manage fields'), 'admin/structure/paragraphs/' . $type_url_str . '/fields')
      );

      // Display fields.
      $row[] = array(
        'data' => l(t('manage display'), 'admin/structure/paragraphs/' . $type_url_str . '/display')
      );
    }

    // Manage bundle.
    $row[] = array(
      'data' => l(t('edit bundle'), 'admin/structure/paragraphs/' . $type_url_str . '/edit')
    );
    // Delete bundle.
    $row[] = array(
      'data' => l(t('delete bundle'), 'admin/structure/paragraphs/' . $type_url_str . '/delete')
    );

    $rows[$bundle->bundle] = $row;
  }

  // Sort rows by bundle.
  ksort($rows);

  // Render paragraphs bundle table.
  $page['paragraphs_bundle_table'] = array(
    '#theme' => 'table',
    '#header' => $header,
    '#rows' => $rows,
    '#empty' => t('No paragraph bundles have been defined yet.'),
  );

  return $page;
}

/**
 * Form to create or edit an paragraph bundle.
 */
function paragraphs_admin_bundle_form($form, &$form_state, $bundle = NULL) {

  if (!isset($bundle) && !$bundle) {
    // This is a new bundle
    $bundle = new stdClass();
    $bundle->name = '';
    $bundle->bundle = '';
    $bundle->locked = 0;
  }
  else {
    if (!$bundle) {
      drupal_set_message(t('Could not load bundle'), 'error');
      drupal_goto('admin/structure/paragraphs');
    }
  }

  $form['#paragraphs_bundle'] = $bundle;

  $form['name'] = array(
    '#title' => t('Name'),
    '#type' => 'textfield',
    '#default_value' => $bundle->name,
    '#description' => t('The human-readable name of this bundle. It is recommended that this name begin with a capital letter and contain only letters, numbers, and spaces. This name must be unique.'),
    '#required' => TRUE,
    '#size' => 30,
  );

  if (!$bundle->locked) {

    $form['bundle'] = array(
      '#type' => 'machine_name',
      '#default_value' => $bundle->bundle,
      '#maxlength' => 32,
      '#disabled' => $bundle->locked,
      '#machine_name' => array(
        'exists' => 'paragraphs_bundle_load',
      ),
      '#description' => t('A unique machine-readable name for this paragraph bundle. It must only contain lowercase letters, numbers, and underscores.'),
    );
  }

  $form['locked'] = array(
    '#type' => 'value',
    '#value' => $bundle->locked,
  );

  $form['actions'] = array('#type' => 'actions');
  $form['actions']['submit'] = array(
    '#type' => 'submit',
    '#value' => t('Save Paragraph bundle'),
    '#weight' => 40,
  );

  return $form;
}

/**
 * Form validation handler for paragraphs_admin_bundle_form().
 *
 * @see paragraphs_admin_bundle_form_submit()
 */
function paragraphs_admin_bundle_form_validate($form, &$form_state) {
  $bundle = new stdClass();
  $bundle->name = trim($form_state['values']['name']);

  if (!$form_state['values']['locked']) {
    $bundle->bundle = trim($form_state['values']['bundle']);
    // 'theme' conflicts with theme_node_form().
    // '0' is invalid, since elsewhere we check it using empty().
    if (in_array($bundle->bundle, array('0', 'theme'))) {
      form_set_error('type', t("Invalid machine-readable name. Enter a name other than %invalid.", array('%invalid' => $bundle->bundle)));
    }
  }

}

/**
 * Submit handler for paragraphs_admin_bundle_form().
 *
 * @see paragraphs_admin_bundle_form()
 */
function paragraphs_admin_bundle_form_submit($form, &$form_state) {

  $bundle = new stdClass();

  if (!$form_state['values']['locked']) {
    $bundle->bundle = trim($form_state['values']['bundle']);
  }
  else {
    $bundle->bundle = $form['#paragraphs_bundle']->bundle;
  }

  $bundle->locked = 1;

  $bundle->name = trim($form_state['values']['name']);

  $variables = $form_state['values'];

  // Remove everything that's been saved already - whatever's left is assumed
  // to be a persistent variable.
  foreach ($variables as $key => $value) {
    if (isset($bundle->$key)) {
      unset($variables[$key]);
    }
  }

  unset($variables['form_token'], $variables['op'], $variables['submit'], $variables['delete'], $variables['reset'], $variables['form_id'], $variables['form_build_id']);


  $status = paragraphs_bundle_save($bundle);

  $t_args = array('%name' => $bundle->name);

  if ($status == SAVED_UPDATED) {
    drupal_set_message(t('The paragraph bundle %name has been updated.', $t_args));
  }
  elseif ($status == SAVED_NEW) {
    drupal_set_message(t('The paragraph bundle %name has been added.', $t_args));
    watchdog('node', 'Added paragraph bundle %name.', $t_args, WATCHDOG_NOTICE, l(t('view'), 'admin/structure/paragraphs'));
  }

  $form_state['redirect'] = 'admin/structure/paragraphs';
  return;
}

/**
 * Menu callback; delete a single paragraph bundle
 *
 * @ingroup forms
 */
function paragraphs_admin_bundle_delete_form($form, &$form_state, $bundle) {
  if (!$bundle) {
    drupal_set_message(t('Could not load bundle'), 'error');
    drupal_goto('admin/structure/paragraphs');
  }

  $form['type'] = array('#type' => 'value', '#value' => $bundle->bundle);
  $form['name'] = array('#type' => 'value', '#value' => $bundle->name);

  $message = t('Are you sure you want to delete the paragraph bundle %bundle?', array('%bundle' => $bundle->name));
  $caption = '<p>' . t('This action cannot be undone. Content using the bundle will be broken.') . '</p>';

  return confirm_form($form, filter_xss_admin($message), 'admin/structure/paragraphs', filter_xss_admin($caption), t('Delete'));
}

/**
 * Process paragraph bundle delete confirm submissions.
 *
 * @see paragraphs_admin_bundle_delete_form()
 */
function paragraphs_admin_bundle_delete_form_submit($form, &$form_state) {
  paragraphs_bundle_delete($form_state['values']['type']);

  $t_args = array('%name' => $form_state['values']['name']);
  drupal_set_message(t('The paragraph bundle %name has been deleted.', $t_args));
  watchdog('node', 'Deleted paragraph bundle %name.', $t_args, WATCHDOG_NOTICE);

  $form_state['redirect'] = 'admin/structure/paragraphs';
  return;
}

/**
 * Helper to get the title of a bundle.
 *
 * @param $bundle
 *   The bundle.
 */
function paragraphs_bundle_title_callback($bundle) {
  return t('Edit Paragraph Bundle !name', array('!name' => $bundle->name));
}