<?php

function invoke() {
  $requestUri = $_SERVER['REQUEST_URI'] ?? '';

  // Required so that the userID is set before generating the menu
  \CRM_Core_Session::singleton()->initialize();
  // Add CSS, JS, etc. that is required for this page.
  \CRM_Core_Resources::singleton()->addCoreResources();
  $parts = explode('?', $requestUri);
  $args = explode('/', $parts[0] ?? '');
  // Remove empty path segments, a//b becomes equivalent to a/b
  $args = array_values(array_filter($args));
  if (!$args) {
    // This is a request for the site's homepage. See if we have one.
    $item = CRM_Core_Invoke::getItem('/');
    if (!$item) {
      // We have no public homepage, so send them to login.
      // This doesn't allow for /civicrm itself to be public,
      // but that's got to be a pretty edge case, right?!
      CRM_Utils_System::redirect('/civicrm/login');
    }
  }
  // This IS required for compatibility. e.g. the extensions (at least) quickform uses it for the form's action attribute.
  $_GET['q'] = implode('/', $args);

  // Render the page
  print CRM_Core_Invoke::invoke($args);
}

function findStandaloneSettings(): string {
  return dirname($_SERVER['DOCUMENT_ROOT']) . '/data/civicrm.settings.php';
}

function findStandaloneCore(): ?string {
  $candidates = [
    implode(DIRECTORY_SEPARATOR, [$_SERVER['DOCUMENT_ROOT'], 'core']),
    implode(DIRECTORY_SEPARATOR, [dirname($_SERVER['DOCUMENT_ROOT']), 'vendor', 'civicrm', 'civicrm-core']),
  ];
  foreach ($candidates as $candidate) {
    if (file_exists($candidate)) {
      return $candidate;
    }
  }
  return NULL;
}

function findStandaloneAutoload(): ?string {
  $candidates = [
    implode(DIRECTORY_SEPARATOR, [dirname($_SERVER['DOCUMENT_ROOT']), 'vendor', 'autoload.php']),
    implode(DIRECTORY_SEPARATOR, [$_SERVER['DOCUMENT_ROOT'], 'core', 'vendor', 'autoload.php']),
  ];
  foreach ($candidates as $candidate) {
    if (file_exists($candidate)) {
      return $candidate;
    }
  }
  return NULL;
}

require_once findStandaloneAutoload();
$civiCorePath = findStandaloneCore();
$classLoader = implode(DIRECTORY_SEPARATOR, [$civiCorePath, 'CRM', 'Core', 'ClassLoader.php']);
require_once $classLoader;
CRM_Core_ClassLoader::singleton()->register();

if (file_exists(findStandaloneSettings())) {
  require_once findStandaloneSettings();
  invoke();
}
else {
  $coreUrl = '/assets/civicrm/core';

  \Civi\Setup::assertProtocolCompatibility(1.0);

  \Civi\Setup::init([
    // This is just enough information to get going.
    'cms'     => 'Standalone',
    'srcPath' => $civiCorePath,
  ]);
  $ctrl = \Civi\Setup::instance()->createController()->getCtrl();

  $ctrl->setUrls([
    // The URL of this setup controller. May be used for POST-backs
    'ctrl'             => '/civicrm', /* @todo this had url('civicrm') ? */
    // The base URL for loading resource files (images/javascripts) for this project. Includes trailing slash.
    'res'              => $coreUrl . '/setup/res/',
    'jquery.js'        => $coreUrl . '/bower_components/jquery/dist/jquery.min.js',
    'font-awesome.css' => $coreUrl . '/bower_components/font-awesome/css/font-awesome.min.css',
  ]);
  \Civi\Setup\BasicRunner::run($ctrl);
  exit();
}