<?php
namespace ProVM\Command;

use DateTimeImmutable;
use DateInterval;
use Psr\Log\LoggerInterface;
use Symfony\Component\Console\Command\Command;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Output\OutputInterface;
use Symfony\Component\Console\Style\StyleInterface;
use Symfony\Component\Console\Style\SymfonyStyle;
use function Safe\shell_exec;

#[AsCommand(
    name: 'watch',
    hidden: false
)]
class Watch extends Command
{
    public function __construct(protected string $command, protected string $period, protected LoggerInterface $logger, string $name = 'watch')
    {
        parent::__construct($name);
    }

    public function execute(InputInterface $input, OutputInterface $output): int
    {
        $io = new SymfonyStyle($input, $output);
        $io->title('Watch');

        $period = new DateInterval($this->period);
        $current = $this->updateTime($period);
        $io->info('Starting');
        $io->info("Start: {$current->format('Y-m-d H:i:s')}");
        while(true) {
            $io->info('Running Update');
            $this->runUpdate($io);
            $current = $this->updateTime($period);
            $wait = $current->add($period);
            $io->text("Waiting until {$wait->format('Y-m-d H:i:s')}");
            time_sleep_until($wait->getTimestamp());
        }
        return Command::SUCCESS;
    }
    protected function updateTime(DateInterval $interval): DateTimeImmutable
    {
        $t0 = new DateTimeImmutable((new DateTimeImmutable())->format('Y-m-d 00:00:00'));
        $tf = new DateTimeImmutable((new DateTimeImmutable())->add(new DateInterval('P1D'))->format('Y-m-d 00:00:00'));
        $now = new DateTimeImmutable();
        for ($t = $t0; $t < $tf; $t = $t->add($interval)) {
            $t1 = $t->add($interval);
            if ($t < $now and $now < $t1) {
                return $t;
            }
        }
        return $now;
    }
    protected function runUpdate(StyleInterface $io): void
    {
        $command = "{$this->command} update";
        $this->logger->info("Running '{$command}'");
        $result = shell_exec($command);
        $io->note($result);
    }
}