<?php

declare(strict_types=1);

final class HexaGameCloudEventPoller
{
    public function __construct(
        private readonly HexaGameCloudAddonApiClient $client,
        private readonly HexaGameCloudModuleStorage $storage,
        private readonly int $limit = 50,
    ) {
    }

    public function pollAndAcknowledge(): array
    {
        $cursor = $this->storage->getSyncCursor();
        $response = $this->client->listEvents($cursor, $this->limit);
        $events = $response['events'] ?? [];
        $ackIds = [];
        $stored = 0;

        foreach ($events as $event) {
            $remoteId = (string) ($event['id'] ?? '');
            $eventType = (string) ($event['eventType'] ?? 'unknown');
            $payload = is_array($event['payload'] ?? null) ? $event['payload'] : [];

            if ($remoteId === '') {
                continue;
            }

            $this->storage->storeRemoteEvent($remoteId, $eventType, $payload);
            $stored++;

            if ($this->shouldAutoAck($eventType)) {
                $ackIds[] = $remoteId;
            }
        }

        if ($ackIds !== []) {
            $this->client->acknowledgeEvents($ackIds);
        }

        if (!empty($response['nextCursor'])) {
            $this->storage->updateSyncCursor((string) $response['nextCursor']);
        } elseif ($events !== []) {
            $last = $events[count($events) - 1];
            if (!empty($last['id'])) {
                $this->storage->updateSyncCursor((string) $last['id']);
            }
        }

        return [
            'fetched' => count($events),
            'stored' => $stored,
            'acknowledged' => count($ackIds),
            'nextCursor' => $response['nextCursor'] ?? null,
        ];
    }

    private function shouldAutoAck(string $eventType): bool
    {
        return in_array($eventType, ['usage_period_ready', 'usage_period_closed'], true);
    }
}