<?php

/**
 * @file
 * Commerce Billy module file.
 */

/**
 * Implements hook_menu().
 */
function commerce_billy_pdf_menu() {
  $items['invoice-pdf/%commerce_order'] = array(
    'title' => 'Invoice',
    'page callback' => 'commerce_billy_pdf',
    'page arguments' => array(1),
    'access callback' => 'commerce_billy_pdf_view_access',
    'access arguments' => array(1),
    'type' => MENU_CALLBACK,
  );
  $items['admin/commerce/config/billy-invoice/pdf'] = array(
    'title' => 'PDF',
    'page callback' => 'drupal_get_form',
    'page arguments' => array('commerce_billy_pdf_admin_form'),
    'access arguments' => array('configure order settings'),
    'type' => MENU_LOCAL_TASK,
    'file' => 'commerce_billy_pdf.admin.inc',
  );
  return $items;
}

/**
 * Access callback for the PDF invoice.
 *
 * Deny access if order is not in status 'invoiced' or the current user does not
 * have view access to the order itself.
 * Furthermore admins can access 'canceled' orders (credit memo).
 */
function commerce_billy_pdf_view_access($order) {
  if ($order->status == 'canceled' && user_access('administer commerce_order entities')) {
    return TRUE;
  }
  elseif ($order->status != 'invoiced') {
    return FALSE;
  }
  return commerce_order_customer_order_view_access($order);
}

/**
 * Implements hook_views_api().
 */
function commerce_billy_pdf_views_api() {
  return array(
    'api' => 3,
    'path' => drupal_get_path('module', 'commerce_billy_pdf') . '/includes/views',
  );
}

/**
 * Implements hook_entity_info_alter().
 */
function commerce_billy_pdf_entity_info_alter(&$info) {
  $info['commerce_order']['view modes']['pdf'] = array(
    'label' => t('PDF'),
    'custom settings' => FALSE,
  );
  $info['commerce_order']['view modes']['canceled'] = array(
    'label' => t('Credit memo'),
    'custom settings' => FALSE,
  );
}

/**
 * Implements hook_theme().
 */
function commerce_billy_pdf_theme() {
  // Register the template specific for the commerce pdf order.
  $items['commerce_order__commerce_order__pdf'] = array(
    'render element' => 'elements',
    'template' => 'commerce_order--commerce_order--pdf',
    'path' => drupal_get_path('module', 'commerce_billy_pdf') . '/templates',
  );
  $items['commerce_order__commerce_order__canceled'] = array(
    'render element' => 'elements',
    'template' => 'commerce_order--commerce_order--canceled',
    'path' => drupal_get_path('module', 'commerce_billy_pdf') . '/templates',
  );
  $items['commerce_billy_pdf_page'] = array(
    'variables' => array('viewed_orders' => array(), 'inline_css' => ''),
    'template' => 'commerce_billy_pdf_page',
    'path' => drupal_get_path('module', 'commerce_billy_pdf') . '/templates',
  );
  return $items;
}

/**
 * Page callback for invoice PDF.
 */
function commerce_billy_pdf($order) {
  $vars['viewed_orders'][] = entity_view('commerce_order', array($order->order_id => $order), 'pdf', NULL, TRUE);
  // Add a credit memo.
  if ($order->status == 'canceled') {
    $vars['viewed_orders'][] = entity_view('commerce_order', array($order->order_id => $order), 'canceled', NULL, TRUE);
  }
  $css_files = variable_get('commerce_billy_pdf_css_files', array(drupal_get_path('module', 'commerce_billy_pdf') . '/css/pdf.css'));
  $vars['inline_css'] = "";
  foreach ($css_files as $file) {
    $vars['inline_css'] .= file_get_contents($file);
  }

  $html = theme('commerce_billy_pdf_page', $vars);
  $filename = preg_replace('/[^a-z0-9]/', '_', drupal_strtolower('invoice_' . $order->order_number)) . '.pdf';

  try {
    commerce_billy_pdf_output($html, $filename);
    // print $html;
    drupal_exit();
  }
  catch (DOMPDF_Exception $e) {
    drupal_set_message(t('Error generating PDF invoice. Please contact the website administrator.'), 'error');
    watchdog('commerce_billy_pdf', 'DOMPDF exception while generating pdf invoice: %message', array('%message' => $e->getMessage()), WATCHDOG_ERROR);
    return '';
  }
}

/**
 * Implements hook_commerce_order_view().
 */
function commerce_billy_pdf_commerce_order_view($order, $view_mode) {
  // Add content variables for the PDF generation.
  $settings = variable_get('commerce_billy_pdf_text_settings', array());
  $custom_date_format = !empty($settings['invoice_date_format']) ? $settings['invoice_date_format'] : 'Y-m-d';
  if ($view_mode == "pdf" || $view_mode == 'canceled') {
    $order->content['invoice_footer'] = array(
      '#markup' => isset($settings['invoice_footer']) ? $settings['invoice_footer'] : '',
    );
    $order->content['invoice_header'] = array(
      '#markup' => isset($settings['invoice_header']) ? $settings['invoice_header'] : '',
    );
    $order->content['invoice_text'] = array(
      '#markup' => isset($settings['invoice_text']) ? $settings['invoice_text'] : '',
    );
    $location = isset($settings['invoice_location']) ? $settings['invoice_location'] : '';
    $order->content['invoice_header_date'] = array(
      '#markup' => t('@location, @date', array('@location' => $location, '@date' => format_date($order->field_commerce_billy_i_date[LANGUAGE_NONE][0]['value'], 'custom', $custom_date_format))),
    );
    $order->content['order_number'] = array(
      '#markup' => t('Invoice No.: @id', array('@id' => $order->order_number)),
    );
    $order->content['order_id'] = array(
      '#markup' => t('Order No.: @id', array('@id' => $order->order_id)),
    );
    $order->content['invoice_logo'] = array(
      '#value' => variable_get('commerce_billy_pdf_logo', 'misc/druplicon.png'),
    );
  }
  if ($view_mode == "canceled") {
    $order->content['invoice_header_date'] = array(
      '#markup' => t('@location, @date', array('@location' => $location, '@date' => format_date($order->field_commerce_billy_cancel_date[LANGUAGE_NONE][0]['value'], 'custom', $custom_date_format))),
    );
  }
}

/**
 * Transforms HTML to PDF and outputs it to the browser.
 */
function commerce_billy_pdf_output($html, $filename) {
  $path = libraries_get_path('dompdf');
  if (!empty($path)) {
    // dompdf needs write access to its font directory.
    // Copy "libraries/dompdf/lib/fonts" to your public files directory in order
    // for this to work.
    $dir = drupal_realpath('public://');
    define('DOMPDF_FONT_DIR', $dir . '/fonts/');
    define('DOMPDF_TEMP_DIR', file_directory_temp());
    require_once DRUPAL_ROOT . '/' . $path . '/dompdf_config.inc.php';
    spl_autoload_register('DOMPDF_autoload');

    $dompdf = new DOMPDF();
    $dompdf->set_paper('a4', 'portrait');

    $html = htmlspecialchars_decode(htmlentities($html, ENT_NOQUOTES, 'UTF-8'), ENT_NOQUOTES);
    $dompdf->load_html($html);

    $dompdf->render();
    $dompdf->stream($filename, array('Attachment' => TRUE));
  }
  else {
    return t('DOMPDF not found');
  }
}