<?php

declare(strict_types=1);

namespace App\Service;

use App\Service\Provider\ProviderInterface;
use Psr\Log\LoggerInterface;
use Symfony\Component\DependencyInjection\Attribute\AutowireIterator;

final class ContributionAggregator
{
    public function __construct(
        #[AutowireIterator('app.provider')]
        private readonly iterable $providers,
        private readonly LoggerInterface $logger,
    ) {}

    /** @return array<string, int> */
    public function aggregate(): array
    {
        $pending = [];

        /** @var ProviderInterface $provider */
        foreach ($this->providers as $provider) {
            if (!$provider->isConfigured()) {
                continue;
            }

            try {
                $pending[] = [$provider, $provider->startFetch()];
            } catch (\Throwable $e) {
                $this->logger->warning(sprintf('%s fetch failed: %s', $provider::class, $e->getMessage()), ['exception' => $e]);
            }
        }

        $contributions = [];

        foreach ($pending as [$provider, $handle]) {
            try {
                foreach ($provider->resolveFetch($handle) as $date => $count) {
                    $contributions[$date] = ($contributions[$date] ?? 0) + $count;
                }
            } catch (\Throwable $e) {
                $this->logger->warning(sprintf('%s fetch failed: %s', $provider::class, $e->getMessage()), ['exception' => $e]);
            }
        }

        return $contributions;
    }
}