<?php

namespace Kiri\Server;

use Exception;
use Kiri\Abstracts\Config;
use Kiri\Annotation\Inject;
use Kiri\Error\StdoutLoggerInterface;
use Kiri\Server\Abstracts\BaseProcess;
use Swoole\Event;
use Swoole\Process;
use Swoole\Timer;

class Inotify extends BaseProcess
{

    private mixed $inotify;
    private mixed $events;

    private array $watchFiles = [];


    public bool $isReloading = FALSE;


    public array $dirs = [];


    protected int $cid = -1;

    const IG_DIR = [APP_PATH . 'commands', APP_PATH . '.git', APP_PATH . '.gitee'];


    #[Inject(StdoutLoggerInterface::class)]
    public StdoutLoggerInterface $logger;


    /**
     * @param Process $process
     * @return void
     * @throws Exception
     */
    public function process(Process $process): void
    {
        // TODO: Implement process() method.
        set_error_handler([$this, 'error']);
        set_exception_handler([$this, 'error']);

        if (!extension_loaded('inotify')) {
            Timer::tick(1000, function ($cid) {
                if ($this->isStop()) {
                    Timer::clear($cid);
                }
            });
            return;
        }

        $this->dirs = Config::get('inotify', []);

        $this->start();
    }


    public function onSigterm(): static
    {
        pcntl_signal(SIGTERM, function () {
            $this->isStop = true;

            $this->clear();
        });
        return $this;
    }


    /**
     * @return void
     */
    public function error(): void
    {

    }


    /**
     * @throws Exception
     */
    public function start()
    {
        $this->inotify = inotify_init();
        $this->events = IN_MODIFY | IN_DELETE | IN_CREATE | IN_MOVE;
        foreach ($this->dirs as $dir) {
            if (!is_dir($dir)) continue;
            $this->watch($dir);
        }
        Event::add($this->inotify, [$this, 'check']);
        Event::wait();
    }


    public function clear()
    {
        Event::del($this->inotify);
        Event::exit();
    }


    /**
     * 开始监听
     * @throws Exception
     */
    public function check()
    {
        if (!($events = inotify_read($this->inotify))) {
            return;
        }
        if ($this->isReloading) {
            return;
        }

        $LISTEN_TYPE = [IN_CREATE, IN_DELETE, IN_MODIFY, IN_MOVED_TO, IN_MOVED_FROM];
        foreach ($events as $ev) {
            if (!in_array($ev['mask'], $LISTEN_TYPE)) {
                continue;
            }

            //非重启类型
            if (str_ends_with($ev['name'], '.php')) {
                if ($this->isReloading) {
                    break;
                }
                $this->isReloading = TRUE;
                Timer::after(3000, fn() => $this->reload());
            }
        }
    }

    /**
     * @throws Exception
     */
    public function reload()
    {
        $swollen = \Kiri::getDi()->get(SwooleServerInterface::class);

        $swollen->reload();

        $this->clearWatch();
        foreach ($this->dirs as $root) {
            $this->watch($root);
        }
        $this->isReloading = FALSE;
    }


    /**
     * @throws Exception
     */
    public function clearWatch()
    {
        foreach ($this->watchFiles as $wd) {
            @inotify_rm_watch($this->inotify, $wd);
        }
        $this->watchFiles = [];
    }


    /**
     * @param $dir
     * @return bool
     * @throws Exception
     */
    public function watch($dir): bool
    {
        //目录不存在
        if (!is_dir($dir)) {
            return $this->logger->addError("[$dir] is not a directory.");
        }
        //避免重复监听
        if (isset($this->watchFiles[$dir])) {
            return FALSE;
        }

        if (in_array($dir, self::IG_DIR)) {
            return FALSE;
        }

        $wd = @inotify_add_watch($this->inotify, $dir, $this->events);
        $this->watchFiles[$dir] = $wd;

        $files = scandir($dir);
        foreach ($files as $f) {
            if ($f == '.' || $f == '..') {
                continue;
            }
            $path = $dir . '/' . $f;
            //递归目录
            if (is_dir($path)) {
                $this->watch($path);
            } else if (!str_ends_with($f, '.php')) {
                continue;
            }
            //检测文件类型
            if (strstr($f, '.') == '.php') {
                $wd = @inotify_add_watch($this->inotify, $path, $this->events);
                $this->watchFiles[$path] = $wd;
            }
        }
        return TRUE;
    }
}