<?php
// $Id: popups.module,v 1.11.2.19 2008-11-20 21:18:57 starbow Exp $

/**
 * @file
 * This module provides a hook_popups for links to be openned in an Ajax Popup Dialog. 
 *
 * @todo 
 * * Adding Javascript into popups doesn't always work (see examples in popups_admin.modules)
 * * Cache the results of hook_popups.
 */


// **************************************************************************
// CORE HOOK FUNCTIONS   ****************************************************
// **************************************************************************

/**
 * Implementation of hook_menu().
 *
 * @return array of new menu items.
 */
function popups_menu() {
   
  // Themable page save dialog.
  $items['popups/save_dialog'] = array(
    'page callback' => 'theme',
    'page arguments' => array('popup_save_dialog'),
    'access callback' => TRUE,
    'type' => MENU_CALLBACK,
  );  
  
  // Admin Settings.
  $items['admin/settings/popups'] = array(
    'page callback' => 'drupal_get_form',
    'page arguments' => array('popups_admin_settings'),
    'title' => 'Popups',
    'access arguments' => array('administer site configuration'),
    'description' => 'Configure the page-in-a-dialog behavior.',
  ); 
  
  return $items;
}

/**
 * Implementation of hook_init().
 * 
 * Look at the page path and see if popup behavior has been requested for any links in this page.
 */
function popups_init() {  
  $popups = popups_get_popups();

  if (variable_get('popups_always_scan', 0)) {
    popups_add_popups();
  }

  foreach ($popups as $path => $popup_config) {
    if ($path == $_GET['q']) {
      popups_add_popups($popups[$path]);
    }
    elseif (strpos($path, '*') !== FALSE && drupal_match_path($_GET['q'], $path)) {
      popups_add_popups($popups[$path]);
    }
  }  
  
  $render_mode = '';
  if (isset($_SERVER['HTTP_X_DRUPAL_RENDER_MODE'])) {
    $render_mode = $_SERVER['HTTP_X_DRUPAL_RENDER_MODE'];
  }
  
  // Check and see if the page_override param is in the URL.
  // Note - the magic happens here.
  // Need to cache the page_override flag in the session, so it will effect
  // the results page that follows a form submission.
  if ($render_mode == 'json/popups') {
    $_SESSION['page_override'] = TRUE;
  }

  // Move the page_override flag back out of the session.
  if (isset($_SESSION['page_override'])) {
    // This call will not return on form submission.
    $content = menu_execute_active_handler();
    
    // The call did return, so it wasn't a form request, 
    // so we are returning a result, so clear the session flag.
    $override = $_SESSION['page_override'];
    unset($_SESSION['page_override']);
       
    // Menu status constants are integers; page content is a string.
    if (isset($content) && !is_int($content) && isset($override)) {
      print popups_render_as_json($content); 
      exit;  // Do not continue processing request in index.html.
    }    
  }
  
}

/**
 * Implementation of hook_theme().
 *
 */
function popups_theme($existing, $type) {  
  return array(
    'popups_popup' => array(
      'template' => 'popups-popup',
    ),
    'popups_save_dialog' => array(),      
  );
}

/**
 * Implementation of hook_form_alter().
 * 
 * Look at the form_id and see if popup behavior has been requested for any links in this form.
 *
 * @param form_array $form
 * @param array $form_state
 * @param str $form_id: 
 */
function popups_form_alter(&$form, $form_state, $form_id) {
  // Add popup behavior to the form if requested.
  $popups = popups_get_popups();
  if (isset($popups[$form_id])) {
    popups_add_popups($popups[$form_id]);
  } 

  // Alter the theme configuration pages, to add a per-theme-content selector. 
  $theme = arg(4);
  if ($form_id == 'system_theme_settings' && $theme) {
    $form['popups'] = array(
      '#type' => 'fieldset',
      '#title' => t('Popup Settings'),
      '#weight' => -2,
    );
    $form['popups']['popups_content_selector'] = array(
      '#type' => 'textfield',
      '#title' => t('Content Selector'),
      '#default_value' => variable_get('popups_'. $theme .'_content_selector', _popups_default_content_selector()),
      '#description' => t("jQuery selector to define the page's content area on this theme."),
    ); 
    $form['popups']['popups_theme'] = array(
      '#type' => 'hidden',
      '#value' => $theme,
    ); 
    $form['#submit'][] = 'popups_theme_settings_form_submit';
  }
}

// **************************************************************************
// UTILITY FUNCTIONS   ******************************************************
// **************************************************************************

/**
 * Render the page contents in a custom json wrapper.
 *
 * @param $content: themed html.
 * @return $content in a json wrapper with metadata.
 */
function popups_render_as_json($content) { 
  $path = $_GET['q']; // Get current path from params.
  return drupal_json(array(
    'title' => drupal_get_title(),
    'messages' => theme('status_messages'),
    'path' => $path,
    'content' => $content,
  ));
}

/**
 * Define hook_popups().
 * Build the list of popup rules from all modules that implement hook_popups.
 * 
 * @todo - Add some caching so we don't rebuild everytime?
 */
function popups_get_popups() {
  static $popups = NULL;
  if (!isset($popups)) {
    $popups = module_invoke_all('popups');
  }
  return $popups;
}

/**
 * Attach the popup behavior to the page.
 * 
 * The default behavoir of a popup is to open a form that will modify the original page.  
 * The popup submits the form and reloads the original page with the resulting new content. 
 * The popup then replaces the original page's content area with the new copy of that content area.
 *
 * @param array $rules: Array of rules to apply to the page or form, keyed by jQuery link selector.
 *   See README.txt for a listing of the options, and popups_admin.module for examples. 
 */
function popups_add_popups($rules=NULL) { 
  static $added = FALSE;
  $settings = array('popups' => array());
  
  if (is_array($rules)) {
    $settings['popups']['links'] = array();
    foreach ($rules as $popup_selector => $options) { 
      if (is_array($options)) {
        $settings['popups']['links'][$popup_selector] = $options;
        if (isset($options['additionalJavascript']) && is_array($options['additionalJavascript'])) {
          foreach ($options['additionalJavascript'] as $file) {
            drupal_add_js($file);
          }
        }
        // Experimental.  Won't be needed if http://drupal.org/node/336641 works.
        if (isset($options['additionalJavascriptSettings']) && is_array($options['additionalJavascriptSettings'])) {
          foreach ($options['additionalJavascriptSettings'] as $key => $setting) {
              drupal_add_js(array($key => $setting), 'setting');
          }
        }
        if (isset($options['additionalCss']) && is_array($options['additionalCss'])) {
          foreach ($options['additionalCss'] as $file) {
            drupal_add_css($file);
          }
        }
      }
      else {
        $settings['popups']['links'][$options] = array();
      }
    }
    if($added) {
      drupal_add_js( $settings, 'setting' );
    }
  }
  if (!$added) {
    drupal_add_css(drupal_get_path('module', 'popups') .'/popups.css');
    drupal_add_css(drupal_get_path('module', 'popups') .'/popups-skin.css');
    drupal_add_js(drupal_get_path('module', 'popups') .'/popups.js');
    drupal_add_js('misc/jquery.form.js');
    
    // Determing if we are showing the default theme or a custom theme.
    global $custom_theme;
    $theme = $custom_theme;
    if (!$theme) {
      $theme = variable_get('theme_default','none');
    }
    $default_target_selector = variable_get('popups_'. $theme .'_content_selector', _popups_default_content_selector());
    
    $settings['popups']['originalPath'] = $_GET['q'];
    $settings['popups']['defaultTargetSelector'] = $default_target_selector;
    $settings['popups']['template'] = theme('popups_popup');
    $settings['popups']['modulePath'] = drupal_get_path('module', 'popups');
    $settings['popups']['popupFinalMessage'] = variable_get('popups_popup_final_message', 1);
    drupal_add_js( $settings, 'setting' );
    $added = TRUE;
  }
}

/**
 * Returns the default jQuery content selector as a string.
 * Currently uses the selector for Garland.  
 * Sometime in the future I will change this to '#content' or '#content-content'.
 */
function _popups_default_content_selector() {
  return 'div.left-corner > div.clear-block:last'; // Garland in Drupal 6.
}

// **************************************************************************
// ADMIN SETTINGS   *********************************************************
// **************************************************************************

/**
 * Form for the Popups Settings page.
 *
 */
function popups_admin_settings() {
  drupal_set_title("Popups Settings");
  $form = array();

  $form['popups_always_scan'] = array(
    '#type' => 'checkbox',
    '#title' => t('Scan all pages for popup links.'),
    '#default_value' => variable_get('popups_always_scan', 0),
  );
  $form['popups_popup_final_message'] = array(
    '#type' => 'checkbox',
    '#title' => t('Do NOT auto-close final message.'),
    '#default_value' => variable_get('popups_popup_final_message', 1),
  );
  
  return system_settings_form($form);
}

/**
 * popups_form_alter adds this submit handler to the theme pages.
 * Set a per-theme jQuery content selector that gets passed into the js settings. 
 *
 * @param $form
 * @param $form_state
 */
function popups_theme_settings_form_submit($form, &$form_state) {
  $theme = $form_state['values']['popups_theme'];
  $content_selector = $form_state['values']['popups_content_selector'];
  variable_set('popups_'. $theme .'_content_selector', $content_selector);
}