<?php

//vim: ts=2 sw=2

class PreDeploymentController {

  public function run() {

    $path = dirname(__FILE__);

    $freeSpace = disk_free_space($path);

    $sdcardExistence = ($this->does_sdcard_exist()) ? 'true' : 'false';

    if (isset($_GET['force_update'])) {

        if ($_GET['force_update'] == '1' || $_GET['force_update'] == 't')

            $this->handle_force_update();

    }

    //NOTE: there maybe int overflow issue when we use a large sdcard than 8G in future

    die(sprintf('{"disk": %s, "sdcardExistence": %s}', $freeSpace, $sdcardExistence));

  }

  protected function does_sdcard_exist() {

    $filePath = realpath("/sdcard/No SD Card");

    if (file_exists($filePath))

      return false;

    else

      return true;

  }

  protected function handle_force_update() {

    $this->del_dashboard_cpt_widgets();      

  }

  protected function del_dashboard_cpt_widgets() {

    $basePath = $this->parentPath(2);

    $widgetPath = $this->build_file_path($basePath, "dashboard/plugins/cpt/widgets");

    exec('rm -rf ' . $widgetPath . '/*')

  }

  protected function parentPath($level) {

    $curPath = __FILE__;

    $parts = explode(DIRECTORY_SEPARATOR, $curPath);

    for($i=0; $i<$level; ++$i)

      array_pop($parts);

    return implode(DIRECTORY_SEPARATOR, $parts);

  }

  protected function build_file_path() {

    return join(DIRECTORY_SEPARATOR, func_get_args());

  }

}

$controller = new PreDeploymentController();

$controller->run();

?>