<?php

/**
 * @file
 * The Serial module main file.
 */

//==================//
// Field Definition //
//==================//

/**
 * Implements hook_field_info().
 */
function serial_field_info() {
  return array(
    'serial' => array(
      'label' => t('Serial'),
      'description' => t('Auto increment serial field type.'),
      'default_widget' => 'serial',
      'default_formatter' => 'serial_formatter_default',
    ),
  );
}

/**
 * Implements hook_field_create_instance().
 */
function serial_field_create_instance($instance) {
  $field = field_read_field($instance['field_name']);
  if ($field['type'] == 'serial') {
    // Create the assistant table:
    module_load_include('inc', 'serial');
    _serial_create_table($field, $instance);

    // Set serial values for old objects
    $old_count = _serial_init_old_nodes($instance['bundle'], $field['field_name']);
    if ($old_count) {
      drupal_set_message(
        t('Serial values have been automatically set for %count existing nodes.',
          array('%count' => $old_count))
      );
    }
  }
}

/**
 * Implements hook_field_delete_instance().
 */
function serial_field_delete_instance($instance) {
  $field = field_read_field($instance['field_name']);
  if ($field['type'] == 'serial') {
    // Drop the assistant table:
    module_load_include('inc', 'serial');
    _serial_drop_table($field, $instance);
  }
}

/**
 * Implements hook_form_alter().
 */
function serial_form_alter(&$form, $form_state, $form_id) {

  if ($form_id == 'field_ui_field_settings_form' && $form['field']['type']['#value'] == 'serial') {
    // Show messages:
    $field_name = $form['field']['field_name']['#value'];
    drupal_set_message(
      t('Serial field %field has been created.',
        array('%field' => $field_name))
    );

    // Go back to Managed Fields:
    $type = $form['#bundle'];
    drupal_goto("admin/structure/types/manage/$type/fields");
  }
}

/**
 * Implements hook_field_presave().
 */
function serial_field_presave($entity_type, $entity, $field, $instance, $langcode, &$items) {
  module_load_include('inc', 'serial');
  if (empty($items)) {
    $sid = _serial_generate_value($instance['bundle'], $field['field_name']);
    $items = array(array('value' => $sid));
  }
}


/**
 * Implements hook_field_is_empty().
 */
function serial_field_is_empty($item, $field) {
  return FALSE; // never should be treated as empty
}

/**
 * Implements hook_node_presave().
 */
function serial_node_presave($node) {
  if (module_exists('auto_nodetitle')) {
    if (auto_nodetitle_get_setting($node->type)) {
      auto_nodetitle_set_title($node);
    }
  }
}

/**
 * Implements hook_node_type_update().
 */
function serial_node_type_update($info) {
  // Handle content type rename:
  if (isset($info->old_type) && ($info->old_type != $info->type)) {
    module_load_include('inc', 'serial');
    _serial_rename_tables($info->old_type, $info->type);
  }
}

// Tokens for fields are currently not supported - http://drupal.org/node/691078.

///**
// * Implements hook_token_info().
// */
//function serial_token_info() {
//  $type = array(
//    'name' => t('Nodes'),
//    'description' => t('Tokens related to individual nodes.'),
//    'needs-data' => 'node',
//  );
//  $node['serial'] = array(
//    'name' => t("Serial Field"),
//    'description' =>  t('Serial field value (unique per node type)'),
//    'needs-data' => 'node',
//  );
//  return array(
//    'types' => array('node' => $type),
//    'tokens' => array('node' => $node),
//  );
//}
//
///**
// * Implements hook_tokens().
// */
//function serial_tokens($type, $tokens, $data, $options) {
//  // TODO
//}

//=================//
// Field Formatter //
//=================//

/**
 * Implements hook_field_formatter_info().
 */
function serial_field_formatter_info() {
  return array(
    'serial_formatter_default' => array(
      'label' => t('Default'),
      'field types' => array('serial'),
    )
  );
}

/**
 * Implements hook_field_formatter_view().
 */
function serial_field_formatter_view($entity_type, $entity, $field, $instance, $langcode, $items, $display) {
  $element = array();

  // Define the field contents for the single default formatter.
  foreach ($items as $delta => $item) {
    $element[$delta] = array(
      '#markup' => theme('serial_formatter_default', array(
        'serial_id' => $item['value'],
      ))
    );
  }
  return $element;
}

/**
 * Theme Functions
 */

/**
 * Implements hook_theme().
 */
function serial_theme() {

  // Register the theme for the default formatter.
  return array(
    'serial_formatter_default' => array(
      'variables' => array(
        'serial_id' => NULL,
      ),
    ),
  );
}

/**
 * Theme function for the default formatter.
 */
function theme_serial_formatter_default($variables) {
  return $variables['serial_id'];
}

//==============//
// Field Widget //
//==============//

/**
 * Implements hook_field_widget_info().
 */
function serial_field_widget_info() {
  return array(
    'serial' => array(
      'label' => t('Hidden (Automatic)'),
      'field types' => array('serial'),
    ),
  );
}

/**
 * Implements hook_field_widget().
 */
function serial_field_widget(&$form, &$form_state, $field, $instance, $items, $delta = 0) {
  return array(
    'value' => array(
      '#type' => 'hidden',
      '#default_value' => $items[$delta]['value'],
    )
  );
}