<?php

declare(strict_types=1);

namespace openvk\Web\Util;

use openvk\Web\Models\Entities\User;
use openvk\Web\Models\RowModel;
use Chandler\Patterns\TSimpleSingleton;

class EventRateLimiter
{
    use TSimpleSingleton;

    private $config;

    public function __construct()
    {
        $this->config = OPENVK_ROOT_CONF["openvk"]["preferences"]["security"]["rateLimits"]["eventsLimit"];
    }

    public function tryToLimit(?User $user, string $event_type, bool $is_update = true): bool
    {
        /*
        Checks count of actions for last x seconds

        Uses OPENVK_ROOT_CONF["openvk"]["preferences"]["security"]["rateLimits"]["eventsLimit"]

        This check should be peformed only after checking other conditions cuz by default it increments counter

        Returns:

        true — limit has exceed and the action must be restricted

        false — the action can be performed

        Also returns "true" if this option is disabled
        */

        $isEnabled = $this->config['enable'];
        $isIgnoreForAdmins = $this->config['ignoreForAdmins'];
        $restrictionTime = $this->config['restrictionTime'];
        $eventsList = $this->config['list'];

        if (!$isEnabled) {
            return false;
        }

        if ($isIgnoreForAdmins && $user->isAdmin()) {
            return false;
        }

        $eventsStats = $user->getEventCounters($eventsList);
        $limitForThatEvent = $eventsList[$event_type];

        $counters = $eventsStats["counters"];
        $refresh_time = $eventsStats["refresh_time"];
        $is_restrict_over = $refresh_time < (time() - $restrictionTime);
        $event_counter = $counters[$event_type];

        if ($refresh_time && $is_restrict_over) {
            $user->resetEvents($eventsList);

            return false;
        }

        $is_limit_exceed = $event_counter >= $limitForThatEvent;

        if (!$is_limit_exceed && $is_update) {
            $this->incrementEvent($counters, $event_type, $user);
        }

        return $is_limit_exceed;
    }

    public function incrementEvent(array $old_values, string $event_type, User $initiator): bool
    {
        /*
        Updates counter for user
        */
        $isEnabled = $this->config['enable'];
        $eventsList = $this->config['list'];

        if (!$isEnabled) {
            return false;
        }

        $old_values[$event_type] += 1;

        $initiator->stateEvents($old_values);
        $initiator->save();

        return true;
    }
}