<?php
// $Id$

/**
 * @file
 * Mass image import module.
 *
 * This module implements a bulk image import operation and uses
 * code from image_import module.
 */

/**
 * Implementation of hook_menu().
 */
function mass_image_import_menu() {
  $items['admin/content/mass_image_import'] = array(
    'title'            => t('Mass image import'),
    'description'      => t('Import tons of images at once.'),
    'page callback'    => 'mass_image_import',
    'access arguments' => array('administer content'),
    'type'             => MENU_NORMAL_ITEM,
  );

  return $items;
}

/**
 * Include image_import helper functions.
 */
require_once drupal_get_path('module', 'image_import') .'/image_import.pages.inc';

/**
 * Menu callback.
 */
function mass_image_import() {
  $output  = t('Mass image import.');
  $output .= drupal_get_form('mass_image_import_form');
  return $output;
}

/**
 * Mass import form.
 */
function mass_image_import_form(&$form_state) {
  $node_types = node_get_types();
  $node_codes = array();

  foreach ($node_types as $item) {
    $node_codes[$item->type] = $item->name;
  }

  $form['node_type'] = array(
    '#type'          => 'select',
    '#title'         => t('Node type'),
    '#options'       => $node_codes,
    '#default_value' => variable_get('mass_image_import_nodetype', array()),
    '#description'   => t('Select node type to import images. In case the node type contains more than one filefield, make sure that the imagefield is the first one.'),
  );

  $form['submit'] = array(
    '#type'  => 'submit',
    '#value' => t('Import images'),
  );

  return $form;
}

/**
 * Handle post-validation form-submission.
 *
 * @todo
 *   Validation.
 */
function mass_image_import_form_submit($form, &$form_state) {
  // Save form input.
  variable_set('node_truncate_node_type', $type);

  // Setup batch configuration
  $type  = $form_state['values']['node_type'];  
  $batch = array(
    'title'            => t('Importing images'),
    'operations'       => array(array('mass_image_import_batch', array($type))),
    'finished'         => 'mass_image_import_batch_finished',
  );

  // Run batch for operations
  batch_set($batch);
  batch_process();
}

/**
 * Batch operation callback for image import.
 */
function mass_image_import_batch($type, &$context) {
  if (empty($context['sandbox'])) {
    // Log
    watchdog('image', 'Starting mass image import.');

    $files                          = mass_image_import_get_files();
    $context['sandbox']['images']   = $files;
    $context['sandbox']['progress'] = 0;
    $context['sandbox']['max']      = count($files);
  }

  $limit = variable_get('image_import_page_size', 50);

  for ($n = 0; $n <= $limit; $n++) {
    if ($context['sandbox']['progress'] >= $context['sandbox']['max']) {
      $context['finished'] = 1;
      break;
    }

    $context['finished']  = $context['sandbox']['progress'] / $context['sandbox']['max'];
    $image                = $context['sandbox']['images'][$context['sandbox']['progress']];
    $context['results'][] = $image->filename;
    $context['message']   = t('Importing @file...',
        array(
          '@file' => $image->filename,
          ));

    mass_image_import_file($image, $type);
    $context['sandbox']['progress']++;
  }
}

/**
 * Make a list of image files.
 *
 * @return
 *   List of available images for import.
 */
function mass_image_import_get_files() {
  $dirpath = variable_get('image_import_path', '');
  if (!file_check_directory($dirpath)) {
    drupal_set_message(
      t("You need to configure the import directory on the image import module's <a href='!admin-settings-import'>settings page</a>.",
      array('!admin-settings-import' => url('admin/settings/image/image_import'))), 'error');
    return;
  }

  // Get file names
  $files = file_scan_directory($dirpath, '.*');
  if (!$files) {
    return;
  }

  // Sort
  ksort($files);

  // Convert to indexed array
  foreach ($files as $file) {
    $images[] = $file;
  }

  return $images;
}

/**
 * Import a single file.
 *
 * @param $file
 *   Image object to import.
 */
function mass_image_import_file($file, $type = 'image') {
  $dirpath  = variable_get('image_import_path', '');
  $origname = $file->basename;

  // Assembly import data
  $file_metadata_modules = module_implements('file_metadata');

  $problems = image_import_validate_file($file);
  // Allow other modules to supply metadata about the images being imported.
  // hook_file_metadata() may populate the $file properties 'title' and
  // 'description'.
  foreach ($file_metadata_modules as $module) {
    $function = $module . '_file_metadata';
    $function($file);
  }

  // Build form
  if ($filepath = file_check_location($dirpath .'/'. $origname, $dirpath)) {
    $args = array(
      'node_type'  => 'image',
      'title'      => isset($file->title) ? $file->title : basename($file->name),
      'body'       => isset($file->body)  ? $file->body  : basename($file->name),
      'filepath'   => $filepath,
      'origname'   => $origname,
    );
  }

  // Create the node object.
  if ($type == 'image') {
    $node = image_create_node_from($args['filepath'], $args['title'], $args['body'], NULL);
  }
  else {
    $node = mass_image_import_create_node_from($args['filepath'], $args['title'], $args['body'], $type);
  }

  if ($node) {
    // Remove the original image now that the import has completed.
    file_delete($args['filepath']);
  }
  else {
    watchdog('image_import', 'There was an error that prevented %filename from being imported.',
      array('%filename' => $args['filepath']), WATCHDOG_ERROR);
  }
}

/**
 * Callback for image import.
 */
function mass_image_import_batch_finished($success, $results, $operations) {
  if ($success) {
    if (count($results) > 0) {
      $message = format_plural(count($results), t('One image processed.'), t('@count images processed.'));
    }
    else {
      $message = t('No images to import.');
    }
  }
  else {
    $message = t('Finished with an error.'); 
  }

  // Log.
  watchdog('image', 'Finished mass image import.');
  drupal_set_message($message);
}

/**
 * Create an image entry. Contains some code from image_create_node_from().
 *
 * @see
 *   http://drupal.org/node/330421#comment-2806336
 */
function mass_image_import_create_node_from($filepath, $title, $body, $type) {
  // Setup.
  $uid   = 1;
  $info  = content_types($type);
  $field = mass_image_import_field($info['fields']);

  // Make sure we can copy the file into our temp directory.
  $original_path = $filepath;
  if (!file_copy($filepath, _image_filename($filepath, IMAGE_ORIGINAL, TRUE))) {
    return FALSE;
  }

  // File data.
  $file            = new stdClass();
  $file->filename  = basename($filepath);
  $file->filepath  = $filepath;
  $file->filemime  = file_get_mimetype($filepath);
  $file->filesize  = filesize($filepath);
  $file->uid       = $uid;
  $file->timestamp = time();
  drupal_write_record('files', $file);

  // Create the node.
  $node       = new StdClass();
  $node->type = $type;

  // Add image field.
  $files              = array();
  $files[0]           = (array) $file;
  $files[0]['status'] = 0;

  // Node form.
  $form_state                    = array();
  $form_state['values']['type']  = $type;
  $form_state['values']['title'] = $title;
  $form_state['values']['body']  = $body;
  $form_state['values']['op']    = t('Save');
  $form_state['values'][$field]  = $files;  

  // Submit.
  module_load_include('inc', 'node', 'node.pages');
  drupal_execute($type .'_node_form', $form_state, $node);
  return $node;
}

/**
 * Get the first filefield from a content type.
 *
 * @param $fields
 *   Content type fields.
 *
 * @return
 *   Field name.
 */
function mass_image_import_field($fields) {
  foreach ($fields as $field) {
    if ($field['type'] == 'filefield') {
      return $field['field_name'];
    }
  }  
}