<?php
namespace nur\sery\app;

use nur\sery\os\proc\Cmd;
use nur\sery\output\msg;
use nur\sery\StateException;

class launcher {
  static function launch(string $appClass, ...$args): int {
    $cmd = new Cmd([
      __DIR__."/../../lib/launch.php",
      $appClass,
      ...$args,
    ]);
    $cmd->addRedir("null");
    $cmd->passthru($exitcode);
    return $exitcode;
  }

  static function _start(array $args, Runfile $runfile): bool {
    if ($runfile->isLocked()) return false;
    $pid = pcntl_fork();
    if ($pid == -1) {
      # parent, impossible de forker
      throw new StateException("unable to fork");
    } elseif ($pid) {
      # parent, fork ok
      return true;
    } else {
      ## child, fork ok
      # Créer un groupe de process, pour pouvoir les tuer toutes en même temps
      $runfile->tm_startPg();
      $exitcode = -776;
      try {
        # puis lancer la commande
        $cmd = new Cmd($args);
        #XXX fichier de log?
        #XXX charger /g/init.env
        $cmd->addSource("/g/init.env");
        $cmd->addRedir("null");
        $cmd->fork_exec($exitcode);
        return true;
      } finally {
        $runfile->wfStopped($exitcode);
      }
    }
  }

  static function _stop(Runfile $runfile): void {
    $data = $runfile->read();
    $pid = $data["pg_pid"];
    if ($pid === null) {
      msg::warning("$data[name]: groupe de process inconnu");
      return;
    }
    msg::action("kill $pid");
    if (!posix_kill(-$pid, SIGKILL)) {
      switch (posix_get_last_error()) {
      case PCNTL_ESRCH:
        msg::afailure("process inexistant");
        break;
      case PCNTL_EPERM:
        msg::afailure("process non accessible");
        break;
      case PCNTL_EINVAL:
        msg::afailure("signal invalide");
        break;
      }
      return;
    }
    $timeout = 10;
    while ($runfile->tm_isUndead($pid)) {
      sleep(1);
      if (--$timeout == 0) {
        msg::afailure("impossible d'arrêter la tâche");
        return;
      }
    }
    $runfile->wfStopped(-778);
    msg::asuccess();
  }
}