<?php
// $Id$

/**
 * @file
 * Language icons
 * 
 * Internationalization (i18n) package
 * 
 * @author Jose A. Reyero, 2007
 *
 */

/**
 * Implementation of hook_theme()
 */
function languageicons_theme() {
  return array(
    'languageicons_icon' => array(
      'arguments' => array('language' => NULL, 'title' => NULL),
    ),
    'languageicons_place' => array(
      'arguments' => array('text' => NULL, 'icon' => NULL, 'separator' => ' '),
    ),
  );
}

/**
 * Implementation of hook_help().
 */
function languageicons_help($section = 'admin/help#languageicons' ) {
  switch ($section) {
    case 'admin/help#languageicons' :
      $output = '<p>'.t('This module manages language icons for multilingual sites:').'</p>';
      $output .= '<ul>';
      $output .= '<li>'.t('Automatically adds icons to language links').'</li>';
      $output .= '<li>'.t('Provides related theme functions').'</li>';
      $output .= '</ul>';
      $output .= '<p>'. t('For more information please read the <a href="@i18n">on-line help pages</a>.', array('@i18n' =>'http://drupal.org/node/31631')) .'</p>';
      return $output;
    case 'admin/settings/languageicons':
      $output .= '<p>'.t('To enable multilingual support for specific content types go to !configure_content_types.', array('!configure_content_types' => l(t('configure content types'), 'admin/content/types'), )).'</p>';
      return $output;
  }
}

/**
 * Implementation of hook_menu().
 */
function languageicons_menu() {
  $items['admin/settings/language/configure/options'] = array(
    'title' => 'Configure',
    'weight' => 10,
    'type' => MENU_DEFAULT_LOCAL_TASK,
  );

  $items['admin/settings/language/configure/icons'] = array(
    'title' => 'Icons',
    'page callback' => 'drupal_get_form',
    'page arguments' => array('languageicons_admin_settings'),
    'weight' => 10,
    'type' => MENU_LOCAL_TASK,
  );
  return $items;
}

/**
 * Implementation of hook_alter_translation_link().
 *
 * Adds language icons to normal translation links.
 */
function languageicons_translation_link_alter(&$links, $path) {
  foreach (array_keys($links) as $langcode) {
    languageicons_link_add($links[$langcode]);
  }
}

/**
 * Implementation of hook_link_alter().
 *
 * Adds language icons to node links.
 */
function languageicons_link_alter(&$links, $node) {
  if ($node->tnid && $translations = module_invoke('translation', 'node_get_translations', $node->tnid)) {
    $languages = language_list();
    foreach ($translations as $langcode => $translation) {
      $index = 'node_translation_'.$langcode;
      if (!empty($links[$index])) {
        languageicons_link_add($links[$index]);
      }
    }
  }
}

/**
 * Add language icon to link
 * 
 * The language icon may be a different language as the destination page, can be passed in 'language_icon'
 */
function languageicons_link_add(&$link, $title = NULL) {
  $language = isset($link['language_icon']) ? $link['language_icon'] : $link['language'];
  $title = $title ? $title : $link['title'];
  if ($icon = theme('languageicons_icon', $language, $title)) {
    $link['title'] = theme('languageicons_place', $link['title'], $icon);
    $link['html'] = TRUE;    
  }
}

/**
 * Form builder function.
 * 
 */
function languageicons_admin_settings() {
  
  $form['languageicons_placement'] = array(
    '#type' => 'radios',
    '#title' => t('Icon placement'),
    '#options' => array('before' => t('Before'), 'after' => t('After'), 'replace' => t('Replace')),
    '#default_value' => variable_get('languageicons_placement', 'before'),
    '#description' => t('Where to display the icon, relative to the link title.'),
  );
  $form['i18n_icon_path'] = array(
    '#type' => 'textfield',
    '#title' => t('Icons file path'),
    '#default_value' => variable_get('i18n_icon_path', drupal_get_path('module', 'i18n').'/flags/*.png'),
    '#size' => 70,
    '#maxlength' => 180,
    '#description' => t('Path for language icons, relative to Drupal installation. \'*\' is a placeholder for language code.'),
  );
  $form['i18n_icon_size'] = array(
    '#type' => 'textfield',
    '#title' => t('Image size'),
    '#default_value' => variable_get('i18n_icon_size', '16x12'),
    '#size' => 10,
    '#maxlength' => 10,
    '#description' => t('Image size for language icons, in the form "width x height".'),
  );

  return system_settings_form($form);
}

/**
 * Theme language icon
 * 
 * This function can be overridden for no language icons
 */
function theme_languageicons_icon($language, $title = NULL){
  if ($path = variable_get('i18n_icon_path', drupal_get_path('module', 'i18n').'/flags/*.png')) {
    $src = base_path().str_replace('*', $language->language, $path);
    $title = $title ? $title : $language->native;
    $attribs = array('class' => 'language-icon', 'alt' => $title);
    if ($size = variable_get('i18n_icon_size', '16x12')) {
      list($width, $height) = explode('x', $size);
      $attribs += array('width' => $width, 'height' => $height);
    }
    return "<img src=\"$src\" ".drupal_attributes($attribs)." />";
  }
}

/**
 * Theme language icon and text
 */
function theme_languageicons_place($text, $icon, $separator = ' ') {
  switch(variable_get('languageicons_placement', 'before')) {
    case 'after':
      return $text . $separator . $icon;
    case 'replace':
      return $icon;
    case 'before':
    default:
      return $icon . $separator . $text;
  }
}