<?php

/**
 * @file
 * Provides a Cancel button for comments.
 *
 * Currently available buttons:
 * - Cancel
 */

/**
 * Implements hook_permission().
 */
function mb_comment_permission() {
  return array(
    'access mb comment' =>  array(
      'title' => t('Use More Comment Buttons'),
      'description' => t('Use the buttons defined by More Buttons Comment.')
    )
  );
}

/**
 * Implements hook_menu().
 */
function mb_comment_menu() {
  $items = array();

  $items['admin/config/mb/buttons/more-buttons-comment'] = array(
    'page callback' => 'drupal_get_form',
    'page arguments' => array('mb_comment_admin'),
    'title' => 'Comments',
    'access arguments' => array('administer site configuration'),
    'description' => 'An overview of what content type uses buttons/functions of the MB Comment module.',
    'file' => 'mb_comment.admin.inc',
    'type' => MENU_LOCAL_TASK,
    'weight' => 10
  );
  $items['admin/config/mb/buttons/more-buttons-comment/reset'] = array(
    'page callback' => 'drupal_get_form',
    'page arguments' => array('mb_comment_reset'),
    'access arguments' => array('administer site configuration'),
    'type' => MENU_CALLBACK,
    'file' => 'mb_comment.admin.inc'
  );

  return $items;
}

/**
 * Implements hook_theme().
 */
function mb_comment_theme() {
  return array(
    'mb_comment_admin' => array(
      'variables' => array('form' => NULL),
    )
  );
}

/**
 * Implements hook_form_alter().
 */
function mb_comment_form_alter(&$form, &$form_state, $form_id) {
  $module = 'mb_comment';

  if ($form['#id']) {
    if ($form['#id'] == 'comment-form') {
      $node = $form['#node'];

      if (arg(0) == 'comment') {
        $default_values = mb_default_values();
        $mb_content_values = mb_get_values('mb');
        $destination = drupal_get_destination();

        $settings = array();
        $settings['cancel'] = variable_get($module . '_cancel_' . $node->type, 0);

        if (!preg_match('/comment\/reply/', url($_SERVER["HTTP_REFERER"]))) {
          $form['comment_referer'] = array(
            '#type' => 'value',
            '#value' => url($_SERVER["HTTP_REFERER"])
          );
        }

        $form_state['cache'] = TRUE;

        // Define the "Cancel" form element.
        if ($settings['cancel'] > 0) {
          if ($settings['cancel'] == 1) {
            $weight_cancel = $form['actions']['submit']['#weight'] - 1;
          }
          elseif ($settings['cancel'] == 2) {
            $weight_cancel = 16;
          }

          $form['actions']['cancel'] = array(
            '#type' => 'submit',
            '#value' => isset($mb_comment_values['cancel']) ? t('@cancel-value', array('@cancel-value' => t($mb_comment_values['cancel']))) : t($default_values['cancel']),
            '#weight' => 30,
            '#validate' => array('mb_comment_cancel_validate')
          );
        }
      }
    }
  }

  switch ($form_id) {
    case 'node_type_delete_confirm':
      // Delete MB Comment content type system variables
      // if content types will be deleted.
      $form['#submit'][] = 'mb_comment_delete_confirm_submit';

      break;

    case 'node_type_form':
      // Provide the prepared additional MB Comment button settings.

      // Check the specific case add content type form.
      if (empty($form['#node_type']->type)) {
        // Add content type.
        $type = 'mb_comment_type_dummy';
      }
      else {
        // Edit an content type.
        $type = $form['#node_type']->type;
      }

      // It makes no sense to use the MB Comment module with the content type panel.
      if ($type == 'panel') {
        return;
      }

      // The additional button settings.
      $form['comment_buttons'] = array(
        '#type' => 'fieldset',
        '#title' => t('Button settings - comments'),
        '#group' => 'additional_settings',
        '#collapsible' => TRUE,
        '#collapsed' => TRUE,
        '#weight' => 5,
        '#attached' => array(
          'js' => array(drupal_get_path('module', $module) . '/' . $module . '_node_form.js')
        )
      );

      // Provide "Cancel" button settings.
      $form['comment_buttons'][$module . '_cancel'] = array(
        '#type' => 'select',
        '#title' => t('Cancel button'),
        '#description' => t('Please select using the button or its position.'),
        '#options' => mb_cancel_button_positions(),
        '#default_value' => variable_get($module . '_cancel_' . $type, 0)
      );

      break;
  }
}

/**
 * Implements hook_validate().
 *
 * Handle the "Cancel" button validation.
 */
function mb_comment_cancel_validate(&$form, &$form_state) {
  // This is the cancel action. No validation required.
  mb_comment_cancel_action($form, $form_state);
}

/**
 * The "Cancel" action.
 *
 *   Handle different submit actions and make different redirects.
 *
 * @see mb_comment_cancel_validate()
 */
function mb_comment_cancel_action(&$form, &$form_state) {
  // Hide the error messages.
  drupal_get_messages('error');

  $redirect = 'node/' . $form['nid']['#value'];

  if (isset($form['comment_referer']['#value'])) {
    $redirect = $form['comment_referer']['#value'];
  }

  drupal_goto($redirect);
}

/**
 * Submit callback to delete MB Comment content type system variables
 * if content types will be deleted.
 */
function mb_comment_delete_confirm_submit($form, &$form_state) {
  $module = 'mb_comment';

  foreach ($form_state['build_info']['args'] as $type) {
    variable_del($module . '_cancel_' . $type->type);
  }
}