<?php

/**
 * @file
 * Provides additional buttons for nodes.
 *
 * Currently available buttons:
 *   - Cancel
 *   - Save and Continue
 * 
 * Furthermore available is the Create new action.
 *   - The action can used as tab in addition to the node View or node Edit tab.
 *   - The action can used as action link.
 *
 * @todo
 * OG compatibility
 */

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

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

  $items['admin/config/mb/buttons/more-buttons-content'] = array(
    'page callback' => 'drupal_get_form',
    'page arguments' => array('mb_content_admin'),
    'title' => 'Contents',
    'access arguments' => array('administer site configuration'),
    'description' => 'An overview of what content type uses buttons/functions of the MB Content module.',
    'file' => 'mb_content.admin.inc',
    'type' => MENU_LOCAL_TASK,
    'weight' => 9
  );
  $items['admin/config/mb/buttons/more-buttons-content/reset'] = array(
    'page callback' => 'drupal_get_form',
    'page arguments' => array('mb_content_reset'),
    'access arguments' => array('administer site configuration'),
    'type' => MENU_CALLBACK,
    'file' => 'mb_content.admin.inc'
  );

  return $items;
}

/**
 * Title callback to provide the title for the create new tab.
 *
 * @return string
 */
function mb_content_createnew_title() {
  $mb_default_values = mb_default_values('mb_content');
  $mb_values = variable_get('mb_values', array());

  return isset($mb_values['tabcn']) ? $mb_values['tabcn'] : $mb_default_values['tabcn'];
}

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

/**
 * Implements hook_form_alter().
 */
function mb_content_form_alter(&$form, &$form_state, $form_id) {
  // Make sure the form alter changes take place only in certain forms.
  // Get the right node types.
  $node_type = '';
  $module = 'mb_content';

  // Node add/edit forms.
  if (isset($form['#node']->type) && isset($form['#node_edit_form'])) {
    $node_type = $form['#node']->type;
  }
  // Preparing the administration of MB Content; Content type edit form.
  elseif (isset($form['type']) && !empty($form['#type']['#value']) && isset($form['#node_edit_form'])) {
    $node_type = $form['#type']['#value'];
  }
  // Prepare the administration of MB Content; Content type add form.
  elseif (isset($form['#node']->type) && empty($form['#type']['#value']) && isset($form['#node_edit_form'])) {
    // Use temporary an content type as dummy to handle button management on the "Add content type" page.
    $node_type = 'mb_content_type_dummy';
  }

  switch ($form_id) {
    case 'node_type_form':
      // Provide the prepared MB Content button settings.

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

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

      /**
       * The additional buttons and tab settings.
       */
      $form['node_buttons'] = array(
        '#type' => 'fieldset',
        '#title' => t('Button settings - content'),
        '#group' => 'additional_settings',
        '#collapsible' => TRUE,
        '#collapsed' => TRUE,
        '#weight' => 4,
        '#attached' => array(
          'js' => array(drupal_get_path('module', $module) . '/' . $module . '_node_form.js')
        )
      );
      // Provide "Cancel" button settings.
      $form['node_buttons'][$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)
      );
      // Provide "Save and continue" button settings.
      $form['node_buttons'][$module . '_sac'] = array(
        '#type' => 'select',
        '#title' => t('Save and continue button'),
        '#description' => t('Please select using the button or its position.'),
        '#options' => mb_save_button_positions($module),
        '#default_value' => variable_get($module . '_sac_' . $type, 0)
      );
      // Provide the "Create new" tab option.
      $form['node_buttons'][$module . '_tabcn'] = array(
        '#type' => 'checkbox',
        '#title' => t('Create new tab'),
        '#description' => t('Enable an "Create new" tab in addition to the %view or %edit tab.', array('%view' => t('View'), '%edit' => t('Edit'))),
        '#default_value' => variable_get($module . '_tabcn_' . $type, 0)
      );

      // Use an own submit callback to save the settings
      // on the add/edit content type forms.
      $form['#submit'][] = 'mb_content_admin_form_submit';

      break;

    case 'node_type_delete_confirm':
      // Use an own submit callback to delete MB Content
      // content type system variables if content types will be deleted.
      $form['#submit'][] = 'mb_content_delete_confirm_submit';

      break;

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

      $mb_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);
      $settings['sac'] = variable_get($module . '_sac_' . $node_type, 0);
      $settings['tabcn'] = variable_get($module . '_tabcn_' . $node_type, 0);

      // Insert the referer.
      $referer = preg_replace('/.*\/node\//', 'node/', url($_SERVER["HTTP_REFERER"]));
      $form['#referer'] = $referer;

      $form_state['cache'] = TRUE;

      /**
       * Destination parameter handling.
       *
       * Deactivate the destination parameter
       * and keep these parameter in order to be able to use it anyway.
       */
      if (preg_match('/\?destination/', $form['#action'])) {
        $form_state['storage']['#mb_redirect'] = preg_replace('/^.*\?destination\=/', '', $form['#action']);
      }
      elseif (preg_match('/\?destination/', $form['#referer'])) {
        $form_state['storage']['#mb_redirect'] = preg_replace('/^.*\?destination\=/', '', $form['#referer']);
      }
      $form['#action'] = preg_replace('/\?destination.*/', '', $form['#action']);

      if (isset($form_state['storage']['#mb_redirect'])) {
        $form['storage']['#mb_redirect'] = $form_state['storage']['#mb_redirect'];
      }
      elseif (isset($form['storage']['#mb_redirect'])) {
        $form_state['#mb_redirect'] = $form['storage']['#mb_redirect'];
      }

      // Identify the "Create new" tab action.
      if (preg_match('/node\/\d+/', $referer) && !isset($form_state['clicked_button']['#id'])) {
        $form['#tabcn_referer'] = $referer;
      }

      /**
       *  The "Save and continue" form element.
       */
      if ($settings['sac'] > 0) {
        // Left of Save.
        if ($settings['sac'] == 1) {
          $weight_sac = $form['actions']['submit']['#weight'] - 0.025;
        }
        // Right of Save
        if ($settings['sac'] == 2) {
          $weight_sac = $form['actions']['submit']['#weight'] + 0.025;
        }

        // Define the "Save and continue" form element.
        $form['actions']['sac'] = array(
          '#type' => 'submit',
          '#value' => isset($mb_content_values['sac']) ? t('@sac-value', array('@sac-value' => t($mb_content_values['sac']))) : t($mb_default_values['sac']),
          '#weight' => $weight_sac,
          '#validate' => array('mb_content_changed_validate'),
          '#submit' => array('node_form_submit', 'mb_content_sac_submit')
        );
      }

      /**
       *  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;
        }

        // Define the "Cancel" form element.
        $form['actions']['cancel'] = array(
          '#type' => 'submit',
          '#value' => isset($mb_content_values['cancel']) ? t('@cancel-value', array('@cancel-value' => t($mb_content_values['cancel']))) : t($mb_default_values['cancel']),
          '#weight' => $weight_cancel,
          '#validate' => array('mb_content_cancel_validate'),
          '#limit_validation_errors' => array(),
        );
      }

      /**
       *  Extra validation for the standard buttons.
       *  Without this break the normal form handling.
       *  @see mb_content_cancel_validate(), mb_content_changed_submit()
       *  Call edit form from admin/content is no needed this callbacks.
       */
      if ($settings['sac'] > 0 || $destination['destination'] != 'admin/content') {
        $form['actions']['preview']['#validate'][] = 'mb_content_changed_validate';
        $form['actions']['submit']['#validate'][] = 'mb_content_changed_validate';
        $form['actions']['delete']['#validate'][] = 'mb_content_changed_validate';
        // Corresponding submit callbacks.
        $form['actions']['preview']['#submit'][] = 'mb_content_changed_submit';
        $form['actions']['submit']['#submit'][] = 'mb_content_changed_submit';
      }

      // OG compatibility.
      // Provide the group ID.
      // Add an new group article.
//      if (isset($_GET['gids_node'])) {
//        $gids_node = $_GET['gids_node'];
//        $form['#mnb']['og']['group_id'] = (int)$gids_node[0];
//      }
      // Edit an group article.
//      $og_context = module_invoke('og', 'get_context_by_url');
//      if (isset($og_context->nid)) {
//        $form['#mnb']['og']['group_id'] = $og_context->nid;
//      }

      break;
  }
}

/**
 * Implements hook_menu_local_tasks_alter().
 *
 * Alter the node local tasks to
 *   - use an destination parameter
 *   - provide the "Create new" tab.
 */
function mb_content_menu_local_tasks_alter(&$data, $router_item, $root_path) {
  global $base_url;

  $destination = drupal_get_destination();
  $module = 'mb_content';

  if ($router_item['tab_root'] == 'node/%') {
    $node = $router_item['map'][1];
    $node_type_name = node_type_get_name($node);

    // Add Create new as local task tab.
    // Note: access_callback no works.
    if (variable_get('mb_content_tabcn_' . $node->type, 0) == 1) {
      // Note: The weight setting are not accepted.
      // Organize the proper tab weight for the new "Create new" tab to display the new tab on the right position.
      $holder = array();

      // User with node edit permission. The tabs are displayed and the Edit tab exists.
      if (isset($data['tabs'][0]['output'][1]) && $data['tabs'][0]['output'][1]['#link']['page_callback'] == 'node_page_edit') {
        $holder = array_splice($data['tabs'][0]['output'], 2);
      }
      // User without node edit permission. The tabs are displayed and the Edit tab is not exist.
      elseif (isset($data['tabs'][0]['output'][1]) && $data['tabs'][0]['output'][1]['#link']['page_callback'] != 'node_page_edit') {
        $holder = array_splice($data['tabs'][0]['output'], 1);
      }

      // Insert the new tab.
      $data['tabs'][0]['output'][] = array(
        '#theme' => 'menu_local_task',
        '#link' => array(
          'title' => mb_content_createnew_title(),
          'href' => 'node/add/' . $node->type,
          'tab_root_href' => 'node/' . $node->nid,
          'weight' => 2,
          'localized_options' => array(
            'attributes' => array(
              'title' => t('Create new @content', array('@content' => t($node_type_name))),
            )
          )
        )
      );

      // Rebuild the tabs to display all tabs.
      $data['tabs'][0]['output'] = array_merge($data['tabs'][0]['output'], $holder);
    }

    // Add Create new as action link.
    if ($root_path == 'node/%/edit' && variable_get('mb_content_tabcn_' . $node->type, 0) == 2) {
      $css_node_type = str_replace('_', '-', $node->type);
      
      $item = menu_get_item('node/add/' . $node->type);
      $item['title'] = t('Create new @content', array('@content' => t($node_type_name)));
      $item['localized_options']['attributes']['class'] = array('node-action-link', 'node-action-link-' . $css_node_type);

      $data['actions']['output'][] = array(
        '#theme' => 'menu_local_action',
        '#link' => $item,
      );
    }
  }
}

/**
 * Implements hook_form_validate().
 *
 * Handle the "Cancel" validation.
 */
function mb_content_cancel_validate($form, &$form_state) {
  // This is the cancel action. No validation required.
  mb_content_cancel_action($form, $form_state);
}

/**
 * Implements hook_form_validate().
 *
 * Skip the function node_last_changed().
 */
function mb_content_changed_validate($form, &$form_state) {
  $form['changed']['#default_value'] = 0;
}

/**
 * Implements hook_form_submit().
 *
 * Handle different submit actions and make different redirects.
 *   - "Preview"
 *   - "Save"
 *   - "Delete"
 */
function mb_content_changed_submit($form, &$form_state) {
  $redirect = '<front>';

  if ($form_state['clicked_button']['#id'] == 'edit-preview') {
    $form_state['redirect'] = FALSE;
  }
  if ($form_state['clicked_button']['#id'] == 'edit-submit') {
    $redirect = 'node/' . $form_state['nid'];
    drupal_goto($redirect);
  }
  if ($form_state['clicked_button']['#id'] == 'edit-delete') {
    $form_state['redirect'] = $redirect;
  }
}

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

  $redirect = '<front>';
  // $options query example:
  // array('query' => array('destination' => 'node/' . $node->nid))
  $options = array();

  if (arg(0) === 'node' && arg(1) === 'add') {
    // Limitation:
    // Exist only one content type this redirect does not work.
    $redirect = 'node/add';

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

  if (arg(0) === 'node' && is_numeric(arg(1)) && arg(2) === 'edit') {
    $redirect = 'node/' . arg(1);
  }

  if (isset($form_state['storage']['#mb_redirect'])) {
    $redirect = $form_state['storage']['#mb_redirect'];
  }
  elseif (isset($form['storage']['#mb_redirect'])) {
    $redirect = $form['storage']['#mb_redirect'];
  }

  drupal_goto($redirect, $options);
}

/**
 * Implements hook_form_submit().
 *
 * Handle the "Save and continue" action.
 */
function mb_content_sac_submit($form, &$form_state) {
  $destination = drupal_get_destination();

  $nid = $form_state['build_info']['args'][0]->nid;
  $redirect = 'node/' . $nid . '/edit';

  $form_state['rebuild'] = TRUE;

  if (isset($form_state['storage']['#mb_redirect'])) {
    $form['storage']['#mb_redirect'] = $form_state['storage']['#mb_redirect'];
  }
  elseif (isset($form['storage']['#mb_redirect'])) {
    $form_state['#mb_redirect'] = $form['storage']['#mb_redirect'];
  }

  // Is meant edit nodes from content management page.
  if ($destination['destination'] != 'admin/content') {
    drupal_get_messages('error');
    $form_state['redirect'] = $redirect;
  }

  $form_state['redirect'] = $redirect;
}

/**
 * Implements hook_form_submit().
 *
 * Save options from "Add content type" form and administer nodetype form.
 */
function mb_content_admin_form_submit($form, &$form_state) {
  // Handle button management on the "Add content type" page.
  // Delete the dummy content type system variable
  // and set the right content type system variable.
  foreach ($form_state['values'] as $key => $value) {
    if ($key == 'type') {
      $type = $value;
    }
    if (preg_match("/^mb_content_type_dummy/", $key)) {
      // Insert the right content type.
      $new_type = preg_replace("/mb_content_type_dummy/", $type, $key);
      $form_state['values'][$new_type] = $value;
      // Delete the dummy content type.
      unset($form_state['values'][$key]);
    }
  }
}

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

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