<?php
// $Id$

/**
 * @file
 * Adds Facebook's "Like" button to each selected node type.
 * Adds a block with a global static value where users can "Like" the URL set by admins.
 */

/**
 * Implements of hook_menu().
 */
function fblikebutton_menu() {
  $items['admin/config/fblikebutton'] = array(
    'title' => 'FB Like Button',
    'description' => 'Configure the Facebook Like button',
    'page callback' => 'system_admin_menu_block_page',
    'access arguments' => array('administer fblikebutton'),
    'position' => 'right',
    'weight' => -20,
    'type' => MENU_NORMAL_ITEM,
    'file' => 'system.admin.inc',
    'file path' => drupal_get_path('module', 'system'),
  );
  $items['admin/config/fblikebutton/dynamic'] = array(
    'title' => 'Dynamic Like button settings',
    'description' => 'Configure the settings for the Like button as it appears on individual nodes (liking that node).',
    'page callback' => 'drupal_get_form',
    'page arguments' => array('fblikebutton_dynamic_settings'),
    'access arguments' => array('administer fblikebutton'),
    'type' => MENU_NORMAL_ITEM,
    'file' => 'fblikebutton.admin.inc',
    'weight' => 0,
  );
  $items['admin/config/fblikebutton/static'] = array(
    'title' => 'Static Like button settings',
    'description' => 'Configure the settings for the static Like button as it appears in the block (liking a given url). Use this to like for example your Facebook fanpage.',
    'page callback' => 'drupal_get_form',
    'page arguments' => array('fblikebutton_static_settings'),
    'access arguments' => array('administer fblikebutton block'),
    'type' => MENU_NORMAL_ITEM,
    'file' => 'fblikebutton.admin.inc',
    'weight' => 1,
  );
  return $items;
}

/**
 * Implements of hook_node_view().
 */
function fblikebutton_node_view($node, $view_mode) {
  global $user, $base_url;
  $types = variable_get('fblikebutton_node_types', array());
  $fullnodedisplay = variable_get('fblikebutton_full_node_display', 0);
  $teaserdisplay = variable_get('fblikebutton_teaser_display', 0);
  $full = ($view_mode == 'full') ? TRUE : FALSE;
  $show = ( ! empty($types[$node->type]) && user_access('access fblikebutton'));
  // Thanks to corbacho for supplying the code for the $webpage_to_like variable...
  // (It was apparently throwing errors/notices the way I had it set up.)
  $webpage_to_like = url("node/$node->nid", array('absolute' => TRUE));
  $likebutton_weight = variable_get('fblikebutton_weight', '0');
  $conf = array(
    'layout' => variable_get('fblikebutton_layout', 'standard'),
    'action' => variable_get('fblikebutton_action', 'like'),
    'color_scheme' => variable_get('fblikebutton_color_scheme', 'light'),
    'show_faces' => variable_get('fblikebutton_show_faces', 'true'),
    'font' => variable_get('fblikebutton_font', 'arial'),
    'height' => variable_get('fblikebutton_iframe_height', '80'),
    'width' => variable_get('fblikebutton_iframe_width', '450'),
    'send' => variable_get('fblikebutton_send', 'true'),
    'other_css' => variable_get('fblikebutton_iframe_css', ''),
    'language' => variable_get('fblikebutton_language', 'en_US'),
  );
  if ($show) {
      
  // Content area
    if (($view_mode == 'teaser' && $teaserdisplay == 1) || ($view_mode == 'full' && $fullnodedisplay == 0)) {
      $node->content['fblikebutton_field'] = array(
        '#markup' => _fblikebutton_field($webpage_to_like, $conf),
        '#weight' => $likebutton_weight,
      );
    }
  // Link area
    if (($view_mode == 'teaser' && $teaserdisplay == 2) || ($view_mode == 'full' && $fullnodedisplay == 2)) {
      $node->content['links']['#links']['fblikebutton_field'] = array(
        'title' => _fblikebutton_field($webpage_to_like, $conf),
        'html' => TRUE,
      );
    }
  }
}


/**
 * Implements of hook_permission().
 */
function fblikebutton_permission() {
  return array(
    'administer fblikebutton' => array(
      'title' => t('Administer FB Like button'),
      'description' => t('Perform administration tasks for FB Like button')
    ),
    'administer fblikebutton block' => array(
      'title' => t('Administer FB Like button block'),
      'description' => t('Perform administration tasks for FB Like button block')
    ),
    'access fblikebutton' => array(
      'title' => t('Access FB Like button'),
    ),
  );
}


/**
 * Implementation of hook_block_info()
 */
function fblikebutton_block_info() {
  $fullnodedisplay = variable_get('fblikebutton_full_node_display', 0);
  $blocks['fblikebutton_static_block'] = array(
    'info' => t('Static FB Like button'),
  );
  if ($fullnodedisplay == 1) {
    $blocks['fblikebutton_dynamic_block'] = array(
      'info' => t('Dynamic FB Like button'),
    );
  }
  return $blocks;
}

/**
 * Implementation of hook_block_configure()
 */
function fblikebutton_block_configure($delta = '') {
  global $base_url;
  $form = array();
  if ($delta == 'fblikebutton_static_block') {
    $form['fblikebutton_static_block'] = array(
      '#type' => 'fieldset',
      '#title' => t('Static FB Like button block'),
      '#collapsible' => FALSE,
    );  
    $form['fblikebutton_static_block']['fblikebutton_static_config'] = array(
      '#markup' => '<p>' . t('To configure the URL and the appearance of the button go to the ' . l(t('static Like button settings'), 'admin/config/fblikebutton/static') . '. Make sure you set the right permissions on the ' . l(t('permissions page'), 'admin/people/permissions') . '.</p>'),
    );
  }
  if ($delta == 'fblikebutton_dynamic_block') {
    $form['fblikebutton_dynamic_block'] = array(
      '#type' => 'fieldset',
      '#title' => t('Dynamic FB Like button block'),
      '#collapsible' => FALSE,
    );  
    $form['fblikebutton_dynamic_block']['fblikebutton_dynamic_config'] = array(
      '#markup' => '<p>' . t('To configure the visibility and the appearance of the button go to the ' . l(t('dynamic Like button settings'), 'admin/config/fblikebutton/dynamic') . '. You can enhance the visibility settings by using the settings on this page. Make sure you set the right permissions on the ' . l(t('permissions page'), 'admin/people/permissions') . '.</p>'),
    );
  }
  return $form;
}

/**
 * Implementation of hook_block_view()
 */
function fblikebutton_block_view($delta = '') {
  global $base_url;
  $node = node_load(arg(1));
  $types = variable_get('fblikebutton_node_types', array());
  if ($node) {
    $show = ( ! empty($types[$node->type]) && user_access('access fblikebutton'));
  }
  else {
    $show = NULL;
  }
  $fullnodedisplay = variable_get('fblikebutton_full_node_display', 0);
  $block = array();
  switch ($delta) {
    case 'fblikebutton_dynamic_block':
      if ($show && $fullnodedisplay == 1) {
        $webpage_to_like = url("node/$node->nid", array('absolute' => TRUE));
        $conf = array(
          'layout' => variable_get('fblikebutton_layout', 'standard'),
          'action' => variable_get('fblikebutton_action', 'like'),
          'color_scheme' => variable_get('fblikebutton_color_scheme', 'light'),
          'show_faces' => variable_get('fblikebutton_show_faces', 'true'),
          'font' => variable_get('fblikebutton_font', 'arial'),
          'height' => variable_get('fblikebutton_iframe_height', '80'),
          'width' => variable_get('fblikebutton_iframe_width', '450'),
          'send' => variable_get('fblikebutton_send', 'true'),
          'other_css' => variable_get('fblikebutton_iframe_css', ''),
          'language' => variable_get('fblikebutton_bl_language', 'en_US'),
        );
        $block['content'] = _fblikebutton_field($webpage_to_like, $conf);
      }
      break;
    case 'fblikebutton_static_block':
      $addr = variable_get('fblikebutton_block_url', $base_url);
      $conf = array(
        'layout' => variable_get('fblikebutton_bl_layout', "standard"),
        'action' => variable_get('fblikebutton_bl_action', "like"),
        'color_scheme' => variable_get('fblikebutton_bl_color_scheme', "light"),
        'show_faces' => variable_get('fblikebutton_bl_show_faces', "false"),
        'font' => variable_get('fblikebutton_bl_font', "arial"),
        'height' => variable_get('fblikebutton_bl_iframe_height', '80'),
        'width' => variable_get('fblikebutton_bl_iframe_width', '450'),
        'other_css' => variable_get('fblikebutton_bl_iframe_css', ''),
        'language' => variable_get('fblikebutton_bl_language', 'en_US'),
      );
      $block['content'] = _fblikebutton_field($addr, $conf);
      break;
  }
  return $block;
}

function _fblikebutton_field($webpage_to_like, $conf) {
  $webpage_to_like = urlencode($webpage_to_like);
  $width = $conf['width'];
  $height = $conf['height'];
  $layout = $conf['layout'];
  $action = $conf['action'];
  $colorscheme = $conf['color_scheme'];
  $show_faces = $conf['show_faces'];
  $font = $conf['font'];
//  $send = $conf['send'];
  $other_css = $conf['other_css'];
  $language = $conf['language'];
  $params = "href={$webpage_to_like}&layout={$layout}&show_faces={$show_faces}&width={$width}px&font={$font}&height={$height}px&action={$action}&colorscheme={$colorscheme}&locale={$language}";
  $src = htmlentities($params);
  $output = '<iframe src="https://www.facebook.com/plugins/like.php?' . $src . '" scrolling="no" frameborder="0" style="border: none; overflow: hidden; width: ' . $width . 'px; height: ' . $height . 'px;' . $other_css . '" allowTransparency="true"></iframe>';
  return $output;
}

/**
 * Implementes hook_views_data()
 */
function fblikebutton_views_api() {
  return array(
    'api' => 3,
  );
}