<?php
// $Id$

/**
 * @file
 * Rules integration for the imagecache module.
 */

/**
 * Implementation of hook_rules_action_info().
 * @ingroup rules
 */
function imagecache_rules_action_info() {
  $options = array();
  $options['imagecache_rules_execute_preset'] = array(
    'label' => t('Execute preset'),
    'arguments' => array(
      'node' => array('type' => 'node', 'label' => t('Content')),
    ),
    'module' => 'Imagecache',
  );
  return $options;
}

function imagecache_rules_execute_preset($node, $settings) {
  if (!isset($settings['presetname'])) {
    watchdog('imagecache', 'Imagecache rule could not be executed because there was no preset specified.');
    return;
  }
  $preset = imagecache_preset($settings['presetname']);
  $field = $node->$settings['field_name'];

  $src = _imagecache_strip_file_directory($field[0]['filepath']);
  $dst = imagecache_create_path($preset['presetname'], $field[0]['filename']);
  if (is_file($dst)) {
    // File already exists. No need to re-generate it.
    return;
  }

  // check if the path to the file exists
  if (!is_file($src) && !is_file($src = file_create_path($src))) {
    watchdog('imagecache', 'File @filename does not exist.', array('@filename' => $src), WATCHDOG_ERROR);
    return;
  }
  // bail if the requested file isn't an image you can't just summon .php files etc...
  if (!getimagesize($src)) {
    watchdog('imagecache', 'Size of image @filename could not be determined.', array('@filename' => $src), WATCHDOG_ERROR);
    return;
  }

  $lockfile = file_directory_temp() .'/'. $preset['presetname'] . basename($src);
  if (file_exists($lockfile)) {
    watchdog('imagecache', 'ImageCache already generating: %dst, Lock file: %tmp.', array('%dst' => $dst, '%tmp' => $lockfile), WATCHDOG_NOTICE);
    return;
  }
  touch($lockfile);
  // register the shtdown function to clean up lock files. by the time shutdown
  // functions are being called the cwd has changed from document root, to
  // server root so absolute paths must be used for files in shutdown functions.
  register_shutdown_function('file_delete', realpath($lockfile));

  // Execute the preset.
  imagecache_build_derivative($preset['actions'], $src, $dst);
}

function imagecache_rules_execute_preset_form($settings, &$form, $form_state) {
  if (empty($settings['field_name'])) {
    _imagecache_get_field($form, $settings);
  }
  else {
    $settings += array('presetname' => '');
    $options = array();
    foreach (imagecache_presets() as $preset) {
      $options[$preset['presetid']] = $preset['presetname'];
    }
    $form['settings']['presetname'] = array(
      '#type' => 'select',
      '#size' => 1,
      '#options' => $options,
      '#default_value' => isset($settings['presetname']) ? $settings['presetname'] : '',
      '#description' => t('Select the name of the preset to execute.'),
      '#required' => TRUE,
    );
  }
}

/**
 * Inserts the imagefield selection field into the given form.
 * @param $form
 *   The form to modify.
 * @param $settings
 *   Current rules settings.
 */
function _imagecache_get_field(&$form, &$settings) {
  if (module_exists('imagefield')) {
    $settings += array('field_name' => '');
    module_load_include('inc', 'content', 'content.rules');
    $form['settings']['field_name'] = array(
      '#type' => 'select',
      '#title' => t('Field'),
      '#options' => content_rules_get_field_names_by_type(),
      '#default_value' => $settings['field_name'],
      '#description' => t('Select the machine-name of the field.'),
      '#required' => TRUE,
    );

    // Replace the usual submit handlers with a own handler.
    $form['submit']['#submit'] = array('imagecache_rules_field_form_step_submit');
    $form['submit']['#value'] = t('Continue');
  }
}

function imagecache_rules_field_form_step_submit($form, &$form_state) {
  $form_state['element']['#settings']['field_name'] = $form_state['values']['settings']['field_name'];
}