<?php

class Handler {

    private $parsedown;

    public function __construct() {
        $this->parsedown = new Parsedown();
    }

    public function handle(object $json, $from, WebSocketHandler $ws) {
        if (!isset($json->action)) {
            throw new HandlerException("Error processing request", 1);
        }
        if (!isset($json->data)) {
            $json->data = null;
        }
        if (!method_exists($this, $json->action)) {
            throw new HandlerException("Error action not found", 2);
        }
        call_user_func_array([$this, $json->action], [$ws, $from, $json->data]);
    }

    public function info(WebSocketHandler $ws, $from) {
        $data = ['id' => $from->resourceId, 'gm' => ($ws->countClients() == 1)];
        $from->send($this->encode($data));
    }

    public function markdown(WebSocketHandler $ws, $from, $data) {
        $data = ['md' => $this->parsedown->text($data)];
        $from->send($this->encode($data));
    }

    public function to_player(WebSocketHandler $ws, $from, $data) {
        $ws->forEachClients(function ($client) use ($data) {
            if ($client->resourceId !== $data->gm) {
                $client->send(json_encode($data));
            }
        });
    }

    public function to_gm(WebSocketHandler $ws, $from, $data) {
        $ws->forOneClient($data->gm, function ($client) use ($data) {
            $client->send(json_encode($data));
        });
    }

    public function to_other(WebSocketHandler $ws, $from, $data) {
        $ws->forEachClients(function ($client) use ($from, $data) {
            if ($from->resourceId !== $client->resourceId) {
                $client->send(json_encode($data));
            }
        });
    }

    private function encode($data, bool $success = true) {
        $status = $success ? 'ok' : 'err';
        return json_encode(['status' => $status, 'data' => $data]);
    }

}

class HandlerException extends Exception {

    public function __construct($message = "", $code = 0, Throwable $previous = null) {
        parent::__construct($message, $code, $previous);
    }

}