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<?php

/**
 * @file
 * Administrative page callbacks for the Filter module.
 */

/**
 * Page callback: Form constructor for a form to list and reorder text formats.
 *
 * @see filter_menu()
 * @see filter_admin_overview_submit()
 * @ingroup forms
 */
function filter_admin_overview($form) {
  // Overview of all formats.
  $formats = filter_formats();
  $fallback_format = filter_fallback_format();

  $form['#tree'] = TRUE;
  $form['formats'] = array(
    '#type' => 'table',
    '#header' => array(t('Name'), t('Roles'), t('Weight'), t('Operations')),
    '#tabledrag' => array(
      array('order', 'sibling', 'text-format-order-weight'),
    ),
  );
  foreach ($formats as $id => $format) {
    $form['formats'][$id]['#attributes']['class'][] = 'draggable';
    $form['formats'][$id]['#weight'] = $format->weight;

    $links = array();
    $links['configure'] = array(
      'title' => t('configure'),
      'href' => "admin/config/content/formats/$id",
    );
    // Check whether this is the fallback text format. This format is available
    // to all roles and cannot be disabled via the admin interface.
    $form['formats'][$id]['#is_fallback'] = ($id == $fallback_format);
    if ($form['formats'][$id]['#is_fallback']) {
      $form['formats'][$id]['name'] = array('#markup' => drupal_placeholder($format->name));
      $roles_markup = drupal_placeholder(t('All roles may use this format'));
    }
    else {
      $form['formats'][$id]['name'] = array('#markup' => check_plain($format->name));
      $roles = array_map('check_plain', filter_get_roles_by_format($format));
      $roles_markup = $roles ? implode(', ', $roles) : t('No roles may use this format');
      $links['disable'] = array(
        'title' => t('disable'),
        'href' => "admin/config/content/formats/$id/disable",
      );
    }

    $form['formats'][$id]['roles'] = array('#markup' => $roles_markup);

    $form['formats'][$id]['weight'] = array(
      '#type' => 'weight',
      '#title' => t('Weight for @title', array('@title' => $format->name)),
      '#title_display' => 'invisible',
      '#default_value' => $format->weight,
      '#attributes' => array('class' => array('text-format-order-weight')),
    );

    $form['formats'][$id]['operations'] = array(
      '#type' => 'operations',
      '#links' => $links,
    );
  }
  $form['actions'] = array('#type' => 'actions');
  $form['actions']['submit'] = array('#type' => 'submit', '#value' => t('Save changes'));
  return $form;
}

/**
 * Form submission handler for filter_admin_overview().
 */
function filter_admin_overview_submit($form, &$form_state) {
  $filter_formats = filter_formats();
  foreach ($form_state['values']['formats'] as $id => $data) {
    // Only update if this is a form element with weight.
    if (is_array($data) && isset($data['weight'])) {
      $filter_formats[$id]->set('weight', $data['weight']);
      $filter_formats[$id]->save();
    }
  }
  filter_formats_reset();
  drupal_set_message(t('The text format ordering has been saved.'));
}

/**
 * Page callback: Displays the text format add/edit form.
 *
 * @param object|null $format
 *   (optional) An object representing a format, with the following properties:
 *   - format: A machine-readable name representing the ID of the text format
 *     to save. If this corresponds to an existing text format, that format
 *     will be updated; otherwise, a new format will be created.
 *   - name: The title of the text format.
 *   - cache: An integer indicating whether the text format is cacheable (1) or
 *     not (0). Defaults to 1.
 *   - status: (optional) An integer indicating whether the text format is
 *     enabled (1) or not (0). Defaults to 1.
 *   - weight: (optional) The weight of the text format, which controls its
 *     placement in text format lists. If omitted, the weight is set to 0.
 *     Defaults to NULL.
 *
 * @return
 *   A form array.
 *
 * @see filter_menu()
 */
function filter_admin_format_page($format = NULL) {
  if (!isset($format->name)) {
    drupal_set_title(t('Add text format'));

    $format = entity_create('filter_format', array());
  }
  return drupal_get_form('filter_admin_format_form', $format);
}

/**
 * Form constructor for the text format add/edit form.
 *
 * @param $format
 *   A format object having the properties:
 *   - format: A machine-readable name representing the ID of the text format to
 *     save. If this corresponds to an existing text format, that format will be
 *     updated; otherwise, a new format will be created.
 *   - name: The title of the text format.
 *   - cache: (optional) An integer indicating whether the text format is
 *     cacheable (1) or not (0). Defaults to 1.
 *   - status: (optional) An integer indicating whether the text format is
 *     enabled (1) or not (0). Defaults to 1.
 *   - weight: (optional) The weight of the text format, which controls its
 *     placement in text format lists. If omitted, the weight is set to 0.
 *
 * @see filter_admin_format_form_validate()
 * @see filter_admin_format_form_submit()
 * @ingroup forms
 */
function filter_admin_format_form($form, &$form_state, $format) {
  $is_fallback = ($format->format == filter_fallback_format());

  $form['#format'] = $format;
  $form['#tree'] = TRUE;
  $form['#attached']['library'][] = array('filter', 'drupal.filter.admin');

  $form['name'] = array(
    '#type' => 'textfield',
    '#title' => t('Name'),
    '#default_value' => $format->name,
    '#required' => TRUE,
    '#weight' => -30,
  );
  $form['format'] = array(
    '#type' => 'machine_name',
    '#required' => TRUE,
    '#default_value' => $format->format,
    '#maxlength' => 255,
    '#machine_name' => array(
      'exists' => 'filter_format_exists',
      'source' => array('name'),
    ),
    '#disabled' => !empty($format->format),
    '#weight' => -20,
  );

  // Add user role access selection.
  $form['roles'] = array(
    '#type' => 'checkboxes',
    '#title' => t('Roles'),
    '#options' => array_map('check_plain', user_role_names()),
    '#disabled' => $is_fallback,
    '#weight' => -10,
  );
  if ($is_fallback) {
    $form['roles']['#description'] = t('All roles for this text format must be enabled and cannot be changed.');
  }
  if (!empty($format->format)) {
    // If editing an existing text format, pre-select its current permissions.
    $form['roles']['#default_value'] = array_keys(filter_get_roles_by_format($format));
  }
  elseif ($admin_role = config('user.settings')->get('admin_role')) {
    // If adding a new text format and the site has an administrative role,
    // pre-select that role so as to grant administrators access to the new
    // text format permission by default.
    $form['roles']['#default_value'] = array($admin_role);
  }

  // Retrieve available filters and load all configured filters for existing
  // text formats.
  $filter_info = filter_get_filters();
  $filters = !empty($format->format) ? filter_list_format($format->format) : array();

  // Prepare filters for form sections.
  foreach ($filter_info as $name => $filter) {
    // Create an empty filter object for new/unconfigured filters.
    if (!isset($filters[$name])) {
      $filters[$name] = new stdClass();
      $filters[$name]->format = $format->format;
      $filters[$name]->module = $filter['module'];
      $filters[$name]->name = $name;
      $filters[$name]->status = 0;
      $filters[$name]->weight = $filter['weight'];
      $filters[$name]->settings = array();
    }
  }
  $form['#filters'] = $filters;

  // Filter status.
  $form['filters']['status'] = array(
    '#type' => 'item',
    '#title' => t('Enabled filters'),
    '#prefix' => '<div id="filters-status-wrapper">',
    '#suffix' => '</div>',
    // This item is used as a pure wrapping container with heading. Ignore its
    // value, since 'filters' should only contain filter definitions.
    // @see http://drupal.org/node/1829202
    '#input' => FALSE,
  );
  foreach ($filter_info as $name => $filter) {
    $form['filters']['status'][$name] = array(
      '#type' => 'checkbox',
      '#title' => $filter['title'],
      '#default_value' => $filters[$name]->status,
      '#parents' => array('filters', $name, 'status'),
      '#description' => $filter['description'],
      '#weight' => $filter['weight'],
    );
  }

  // Filter order (tabledrag).
  $form['filters']['order'] = array(
    '#type' => 'item',
    '#title' => t('Filter processing order'),
    '#theme' => 'filter_admin_format_filter_order',
    // This item is used as a pure wrapping container with heading. Ignore its
    // value, since 'filters' should only contain filter definitions.
    // @see http://drupal.org/node/1829202
    '#input' => FALSE,
  );
  foreach ($filter_info as $name => $filter) {
    $form['filters']['order'][$name]['filter'] = array(
      '#markup' => $filter['title'],
    );
    $form['filters']['order'][$name]['weight'] = array(
      '#type' => 'weight',
      '#title' => t('Weight for @title', array('@title' => $filter['title'])),
      '#title_display' => 'invisible',
      '#delta' => 50,
      '#default_value' => $filters[$name]->weight,
      '#parents' => array('filters', $name, 'weight'),
    );
    $form['filters']['order'][$name]['#weight'] = $filters[$name]->weight;
  }

  // Filter settings.
  $form['filter_settings'] = array(
    '#type' => 'vertical_tabs',
    '#title' => t('Filter settings'),
  );

  foreach ($filter_info as $name => $filter) {
    if (isset($filter['settings callback'])) {
      $function = $filter['settings callback'];
      // Pass along stored filter settings and default settings, but also the
      // format object and all filters to allow for complex implementations.
      $settings_form = $function($form, $form_state, $filters[$name], $format, $filter['default settings'], $filters);
      if (!empty($settings_form)) {
        $form['filters']['settings'][$name] = array(
          '#type' => 'details',
          '#title' => $filter['title'],
          '#parents' => array('filters', $name, 'settings'),
          '#weight' => $filter['weight'],
          '#group' => 'filter_settings',
        );
        $form['filters']['settings'][$name] += $settings_form;
      }
    }
  }

  $form['actions'] = array('#type' => 'actions');
  $form['actions']['submit'] = array('#type' => 'submit', '#value' => t('Save configuration'));

  return $form;
}

/**
 * Returns HTML for a text format's filter order form.
 *
 * @param array $variables
 *   An associative array containing:
 *   - element: A render element representing the form.
 *
 * @ingroup themeable
 */
function theme_filter_admin_format_filter_order($variables) {
  $element = $variables['element'];

  // Filter order (tabledrag).
  $rows = array();
  foreach (element_children($element, TRUE) as $name) {
    $element[$name]['weight']['#attributes']['class'][] = 'filter-order-weight';
    $rows[] = array(
      'data' => array(
        drupal_render($element[$name]['filter']),
        drupal_render($element[$name]['weight']),
      ),
      'class' => array('draggable'),
    );
  }
  $output = drupal_render_children($element);
  $output .= theme('table', array('rows' => $rows, 'attributes' => array('id' => 'filter-order')));
  drupal_add_tabledrag('filter-order', 'order', 'sibling', 'filter-order-weight', NULL, NULL, TRUE);

  return $output;
}

/**
 * Form validation handler for filter_admin_format_form().
 *
 * @see filter_admin_format_form_submit()
 */
function filter_admin_format_form_validate($form, &$form_state) {
  $format_format = trim($form_state['values']['format']);
  $format_name = trim($form_state['values']['name']);

  // Ensure that the values to be saved later are exactly the ones validated.
  form_set_value($form['format'], $format_format, $form_state);
  form_set_value($form['name'], $format_name, $form_state);

  $filter_formats = entity_load_multiple('filter_format');
  foreach ($filter_formats as $format) {
    if ($format->name == $format_name && $format->format != $format_format) {
      form_set_error('name', t('Text format names must be unique. A format named %name already exists.', array('%name' => $format_name)));
      break;
    }
  }
}

/**
 * Form submission handler for filter_admin_format_form().
 *
 * @see filter_admin_format_form_validate()
 */
function filter_admin_format_form_submit($form, &$form_state) {
  // Remove unnecessary values.
  form_state_values_clean($form_state);

  // Add the submitted form values to the text format, and save it.
  $format = $form['#format'];
  foreach ($form_state['values'] as $key => $value) {
    $format->set($key, $value);
  }
  $status = $format->save();

  // Save user permissions.
  if ($permission = filter_permission_name($format)) {
    foreach ($form_state['values']['roles'] as $rid => $enabled) {
      user_role_change_permissions($rid, array($permission => $enabled));
    }
  }

  switch ($status) {
    case SAVED_NEW:
      drupal_set_message(t('Added text format %format.', array('%format' => $format->name)));
      break;

    case SAVED_UPDATED:
      drupal_set_message(t('The text format %format has been updated.', array('%format' => $format->name)));
      break;
  }
}

/**
 * Page callback: Form constructor to confirm the text format deletion.
 *
 * @param $format
 *   An object representing a text format.
 *
 * @see filter_menu()
 * @see filter_admin_disable_submit()
 * @ingroup forms
 */
function filter_admin_disable($form, &$form_state, $format) {
  $form['#format'] = $format;

  return confirm_form($form,
    t('Are you sure you want to disable the text format %format?', array('%format' => $format->name)),
    'admin/config/content/formats',
    t('Disabled text formats are completely removed from the administrative interface, and any content stored with that format will not be displayed. This action cannot be undone.'),
    t('Disable')
  );
}

/**
 * Form submission handler for filter_admin_disable().
 */
function filter_admin_disable_submit($form, &$form_state) {
  $format = $form['#format'];
  filter_format_disable($format);
  drupal_set_message(t('Disabled text format %format.', array('%format' => $format->name)));

  $form_state['redirect'] = 'admin/config/content/formats';
}