<?php
declare(strict_types=1);

namespace Kiri\Server;


use Exception;
use Kiri;
use Kiri\Server\Abstracts\FileWatcher;
use Kiri\Server\Events\OnWorkerStart;
use Kiri\Events\EventProvider;
use Kiri\Events\EventDispatch;
use Kiri\Router\Router;
use Kiri\Server\Abstracts\AsyncServer;
use Kiri\Server\Events\OnShutdown;
use Psr\Container\ContainerInterface;
use Symfony\Component\Console\Command\Command;
use Symfony\Component\Console\Input\InputArgument;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Input\InputOption;
use Symfony\Component\Console\Output\OutputInterface;
use function config;
use Kiri\Server\Abstracts\HotReload;
use Kiri\Di\Inject\Container;

defined('ROUTER_TYPE_HTTP') or define('ROUTER_TYPE_HTTP', 'http');
defined('PID_PATH') or define('PID_PATH', APP_PATH . 'storage/server.pid');

/**
 * Class Command
 * @package Http
 */
class ServerCommand extends Command
{


    #[Container(State::class)]
    public State $state;


    /**
     * @var ContainerInterface
     */
    #[Container(ContainerInterface::class)]
    public ContainerInterface $container;


    /**
     * @var AsyncServer
     */
    #[Container(AsyncServer::class)]
    public AsyncServer $asyncServer;


    /**
     * @var EventDispatch
     */
    #[Container(EventDispatch::class)]
    public EventDispatch $eventDispatch;


    /**
     * @var EventProvider
     */
    #[Container(EventProvider::class)]
    public EventProvider $eventProvider;


    /**
     * @return void
     */
    protected function configure(): void
    {
        $this->setName('sw:server')
             ->setDescription('server start|stop|reload|restart')
             ->addArgument('action', InputArgument::OPTIONAL, 'run action', 'start')
             ->addOption('daemon', 'd', InputOption::VALUE_NONE, 'is run daemonize');
    }


    /**
     * @param InputInterface $input
     * @param OutputInterface $output
     * @return int
     * @throws
     */
    public function execute(InputInterface $input, OutputInterface $output): int
    {
        return match ($input->getArgument('action')) {
            'restart' => $this->restart($input),
            'stop'    => $this->stop(),
            'start'   => $this->start($input),
            default   =>
            throw new Exception('I don\'t know what I want to do.')
        };
    }


    /**
     * @param InputInterface $input
     * @return int
     * @throws
     */
    protected function restart(InputInterface $input): int
    {
        $this->stop();
        $this->start($input);
        return 1;
    }


    /**
     * @return int
     * @throws
     */
    protected function stop(): int
    {
        $configs   = config('servers.server', []);
        $instances = $this->asyncServer->sortService($configs['ports'] ?? []);
        foreach ($instances as $config) {
            $this->state->exit($config->port);
        }
        $this->eventDispatch->dispatch(new OnShutdown());
        return 1;
    }


    /**
     * @param InputInterface $input
     * @return int
     * @throws
     */
    protected function start(InputInterface $input): int
    {
        $this->asyncServer->addProcess(config('process', []));
        $hotReload = \config('servers.reload.hot', false) === true;
        if ($hotReload && !$this->buildHotReloadArtifacts()) {
            throw new Exception('Hot reload artifact build failed.');
        }
        if ($hotReload) {
            $this->asyncServer->addProcess([FileWatcher::class]);
        }
        if (!$hotReload) {
            // 非热更模式可在 Master 进程预扫描，Worker 通过 fork 继承扫描结果。
            // 热更模式必须让新 Worker 自己加载业务类，避免继承旧类定义后无法重新声明。
            di(Router::class)->scan_build_route();
        }
        $this->asyncServer->initCoreServers(config('servers.server', []), (int)$input->getOption('daemon'));
        $this->asyncServer->start();
        return 1;
    }


    /**
     * 热更模式下不要在 Master 进程扫描业务类；先用独立 CLI 进程构建路由 artifact，
     * Worker 启动/重载时直接导入 artifact，避免多个 Worker 同时全量扫描导致 OOM。
     * @return bool
     */
    private function buildHotReloadArtifacts(): bool
    {
        $entry = $this->detectConsoleEntry();
        if ($entry === null) {
            \Kiri::getLogger()->println('hot reload build failed: entry script not found');
            return false;
        }

        $php = PHP_BINARY ?: 'php';
        $command = escapeshellarg($php) . ' ' . escapeshellarg($entry) . ' sw:file-build';
        $output = [];
        $returnCode = 0;
        exec($command . ' 2>&1', $output, $returnCode);

        foreach ($output as $line) {
            if ($line !== '') {
                \Kiri::getLogger()->println('[file-build] ' . $line);
            }
        }

        return $returnCode === 0;
    }


    /**
     * @return string|null
     */
    private function detectConsoleEntry(): ?string
    {
        $candidates = [
            $_SERVER['SCRIPT_FILENAME'] ?? '',
            defined('APP_PATH') ? APP_PATH . 'kiri.php' : '',
            defined('APP_PATH') ? APP_PATH . 'bin/kiri' : '',
            defined('APP_PATH') ? APP_PATH . 'artisan' : '',
        ];

        foreach ($candidates as $candidate) {
            if (is_string($candidate) && $candidate !== '' && is_file($candidate)) {
                return $candidate;
            }
        }

        return null;
    }

}