<?php
/**
 * @file
 * Functions to create a publish button. Real simple, but could be needed.
 *
 * @todo
 * Add permissions, expose to Views, better ctools integration, add simple class
 * settings for css. Nice buttons should have colours.
 */

/**
 * Implements hook_help().
 */
function publish_button_help($path, $arg) {
  switch ($path) {
    case 'admin/help#publish_button':
      return '<h2>' . t('Usage of Publish button') . '</h2>
        <p>' . t('After installation, on each content type there are a
        new setting, Publish button, and to activate publish/unpublish button
        for that content type, you need to check "Use publish/unpublish button
        for this content type" and then click save.') . '</p>
        <p>' . t('Now you need to add permissions for which user roles which
        are allowed to publsih content.') . '</p>
        <p>' . t('Now, when you create a new node, there are a
        publish or unpublish button for all the content types that have the
        button settings.') . '</p>';
  }
}

/**
 * Implements hook_form_alter().
 *
 * Here we have both the settings for which content types that would have the
 * button and the button itself.
 */
function publish_button_form_alter(&$form, &$form_state, $form_id) {
  // Add settings for using content type on types/manage/my_content_type
  if ($form_id == 'node_type_form') {

    // After that a checkbox for settings.
    $form['workflow']['publish_button_content_type'] = array(
      '#type' => 'checkbox',
      '#title' => t('Use publish/unpublish button for this content type'),
      // Getting/setting the variable that contains the setting for the content
      // type.
      '#default_value' => variable_get('publish_button_content_type_' . $form['#node_type']->type, FALSE),
    );
  }

}
/**
 * Implements hook_form_BASE_FORM_ID_alter().
 */
function publish_button_form_node_form_alter(&$form, &$form_state, $form_id) {
  // Now for the button itself.
  // For best practice, make the user object global, because we are checking
  // permissions. Usually we have the object, but we should declare that we
  // need it. We want to be the good guys, don't we?
  global $user;
  if (variable_get('publish_button_content_type_' . $form['#node']->type) == TRUE) {

    // First we check if the node have the status TRUE. That could be TRUE
    // also for unpublished nodes. A little bit sci-fi, isn't it?
    if ($form['#node']->status == TRUE) {
      // So we check if nid have value, so we do not try to unpublish a node
      // that does not exists, that should destroy the universe. We do not
      // want that.
      if (isset($form['nid']['#value'])) {
        if ($form['nid']['#value'] !== NULL) {
          // Add the unpublish button to the actions array.
          if (_publish_button_unpublish_permissions($form['#node']->type) == TRUE) {
            // Check if we are on a delete confirm page.
            if ($form['#form_id'] != 'node_delete_confirm') {
              $form['actions']['unpublish'] = publish_button_render_unpublish_button();
            }
          }
        }
      }
      else {
        if (_publish_button_publish_permissions($form['#node']->type) == TRUE && (isset($form['actions']))) {
          // Check if we are on a delete confirm page.
          if ($form['#form_id'] != 'node_delete_confirm') {
            $form['actions']['publish'] = publish_button_render_publish_button();
          }
        }
      }
    }
    // Then we check if the node have status FALSE.
    if ($form['#node']->status == FALSE) {
      // Add the publish button to the action array.
      if (_publish_button_publish_permissions($form['#node']->type) == TRUE && (isset($form['actions']))) {
        // Check if we are on a delete confirm page.
        if ($form['#form_id'] != 'node_delete_confirm') {
          $form['actions']['publish'] = publish_button_render_publish_button();
        }
      }
    }
  }
}
/**
 * Render publish button.
 */
function publish_button_render_publish_button() {
  $publish_button = array(
    '#type' => 'submit',
    '#access' => TRUE,
    '#value' => t('Publish'),
    '#weight' => '30',
    // Add the submit handler.
    '#submit' => array('_publish_button_publish_node'),
  );
  return $publish_button;
}

/**
 * Render unpublish button.
 */
function publish_button_render_unpublish_button() {
  $unpublish_button = array(
    '#type' => 'submit',
    '#access' => TRUE,
    '#value' => t('Unpublish'),
    // Set a pretty high weight, so the button would come last, but
    // still make it possible for other modules to add buttons after
    // it.
    '#weight' => '30',
    // Add the submit handler.
    '#submit' => array('_publish_button_unpublish_node'),
  );
  return $unpublish_button;
}

/**
 * Submit handler to publish the node.
 */
function _publish_button_publish_node($form, &$form_state) {
  // Set the node status as published. And that's it.
  $form_state['values']['status'] = 1;
  // Use the standard submit function. Do not go custom on me boy.
  node_form_submit($form, $form_state);
}

/**
 * Submit handler to unpublish the node.
 */
function _publish_button_unpublish_node($form, &$form_state) {
  // Set the status as unpublished. And there is no more to that.
  $form_state['values']['status'] = 0;
  // Use the standard submit function.
  node_form_submit($form, $form_state);
}

/**
 * Implements hook_permission().
 */
function publish_button_permission() {
  $perms = array(
    'publish button publish any content types' => array(
      'title' => t('Publish any content types'),
    ),
    'publish button unpublish any content types' => array(
      'title' => t('Unpublish any content types'),
    ),
  );
  foreach (node_type_get_types() as $type) {
    // First we need to check if there are a publish button for the content
    // type.
    if (variable_get('publish_button_content_type_' . $type->type, FALSE)) {
      // And if there is, go through the content types that have the button
      // and create permissions for them.
      if (isset($type->type)) {
        $perms['publish button publish any ' . $type->type] = array(
          'title' => t('@type: Publish any', array('@type' => $type->name)));
        $perms['publish button publish own ' . $type->type] = array(
          'title' => t('@type: Publish own', array('@type' => $type->name)));
        $perms['publish button publish editable ' . $type->type] = array(
          'title' => t('@type: Publish editable', array('@type' => $type->name)));
        $perms['publish button unpublish any ' . $type->type] = array(
          'title' => t('@type: Unpublish any', array('@type' => $type->name)));
        $perms['publish button unpublish own ' . $type->type] = array(
          'title' => t('@type: Unpublish own', array('@type' => $type->name)));
        $perms['publish button unpublish editable ' . $type->type] = array(
          'title' => t('@type: Unpublish editable', array('@type' => $type->name)));
      }
    }
  }
  return $perms;
}

/**
 * Checking publish permissions.
 */
function _publish_button_publish_permissions($type) {
  global $user;
  if (user_access('publish button publish any ' . $type) ||
     user_access('publish button publish own ' . $type) ||
     user_access('publish button publish editable ' . $type) ||
     user_access('publish button publish any content types') == TRUE) {
    return TRUE;
  }
  else {
    return FALSE;
  }
}

/**
 * Checking unpublish permissions.
 */
function _publish_button_unpublish_permissions($type) {
  global $user;
  if (user_access('publish button unpublish any ' . $type) ||
    user_access('publish button unpublish own ' . $type) ||
    user_access('publish button unpublish editable ' . $type) ||
    user_access('publish button unpublish any content types') == TRUE) {
    return TRUE;
  }
  else {
    return FALSE;
  }
}


// Start of views integration.
/**
 * Implements hook_views_api().
 */
function publish_button_views_api() {
  return array('api' => 3);
}

/**
 * Implements hook_views_data_alter().
 */
function publish_button_views_data_alter(&$data) {
  $data['node']['publish_button'] = array(
    'title' => t('Publish button'),
    'help' => t('Display a publish button.'),
    'field' => array(
      'handler' => 'publish_button_views_handler_node_link',
    ),
  );
}

/**
 * Implements hook_menu().
 */
function publish_button_menu() {
  $items['publish_button/%/publish'] = array(
    'title' => 'Publish node',
    'page callback' => 'publish_button_status',
    'page arguments' => array(1),
    'type' => MENU_CALLBACK,
    'access callback' => '_publish_button_menu_access',
    'access arguments' => array(1, 'publish'),
  );
  $items['publish_button/%/unpublish'] = array(
    'title' => 'Unpublish node',
    'page callback' => 'publish_button_status',
    'page arguments' => array(1),
    'type' => MENU_CALLBACK,
    'access callback' => '_publish_button_menu_access',
    'access arguments' => array(1, 'unpublish'),
  );
  return $items;
}

/**
 * Check permissions to hook_menu call.
 */
function _publish_button_menu_access($nid, $status) {
  if ($status == 'publish') {
    $node = node_load($nid);
    if (isset($node->type)) {
      if (_publish_button_publish_permissions($node->type) == TRUE) {
        return TRUE;
      }
    }
  }
  if ($status == 'unpublish') {
    $node = node_load($nid);
    if (isset($node->type)) {
      if (_publish_button_unpublish_permissions($node->type) == TRUE) {
        return TRUE;
      }
    }
  }
  else {
    return FALSE;
  }
}

/**
 * Callback to publish/unpublish node, preferable used via Views.
 */
function publish_button_status($nid) {
  if (!isset($_GET['csrf_token']) || !drupal_valid_token($_GET['csrf_token'], 'publish_button_' . $nid)) {
    drupal_access_denied();
    return;
  }
  // Load the node in a object so we could use it.
  $node = node_load($nid);
  // If the node is published.
  if ($node->status == 1) {
    $node->status = 0;
    node_save($node);
  }
  // If the node is unpublished.
  elseif ($node->status == 0) {
    $node->status = 1;
    node_save($node);
  }
  drupal_goto(drupal_get_destination());
}