<?php

namespace NoccyLabs\React\WebSocket\Group;

use Evenement\EventEmitterInterface;
use Evenement\EventEmitterTrait;
use React\EventLoop\Loop;

class GroupManager implements EventEmitterInterface
{
    use EventEmitterTrait;

    /**
     * @var string emitted when a new group is created
     */
    const EVENT_CREATE = 'create';
    /**
     * @var string emitted after the last member leaves, when the group is destroyed
     */
    const EVENT_DESTROY = 'destroy';

    /** @var array<string,ConnectionGroup> */
    private array $groups = [];

    public function getConnectionGroup(string $name): ConnectionGroup
    {
        if (!array_key_exists($name, $this->groups)) {
            $group = new ConnectionGroup($name);
            $this->groups[$name] = $group;
            // Clean up group when the last member leaves
            $group->on(ConnectionGroup::EVENT_LEAVE, function () use ($group) {
                Loop::futureTick(function () use ($group) {
                    if (count($group) === 0) {
                        $this->emit(self::EVENT_DESTROY, [ $group ]);
                        $group->removeAllListeners();
                        unset($this->groups[$group->getName()]);
                    }
                });
            });
            $this->emit(self::EVENT_CREATE, [ $group ]);
        } else {
            $group = $this->groups[$name];
        }
        return $group;
    }

    public function closeAll(string $reason, int $code=1001)
    {
        foreach ($this->groups as $group) {
            $group->closeAll($reason, $code);
        }
    }
    
}