<?php

declare(strict_types=1);

namespace App\Framework\Queue;

use App\Framework\Queue\ValueObjects\JobId;
use App\Framework\Queue\ValueObjects\JobPayload;
use App\Framework\Queue\ValueObjects\QueueType;

/**
 * Persistent Queue Decorator
 *
 * Wraps any Queue implementation with job persistence and tracking
 */
final readonly class PersistentQueue implements Queue
{
    public function __construct(
        private Queue $baseQueue,
        private JobPersistenceLayer $persistence,
        private QueueType $queueType
    ) {
    }

    /**
     * {@inheritdoc}
     */
    public function push(JobPayload $payload): void
    {
        // Generate job ID if not exists
        $jobId = $payload->getJobId() ?? JobId::generate();

        // Store job in persistence layer
        $this->persistence->storeJob(
            jobId: $jobId,
            queueType: $this->queueType,
            jobData: $payload->job,
            maxAttempts: $payload->retryStrategy->maxAttempts,
            metadata: $payload->metadata
        );

        // Add job ID to payload and push to base queue
        $payloadWithId = $payload->withJobId($jobId);
        $this->baseQueue->push($payloadWithId);
    }

    /**
     * {@inheritdoc}
     */
    public function pop(): ?JobPayload
    {
        $payload = $this->baseQueue->pop();

        if ($payload === null) {
            return null;
        }

        $jobId = $payload->getJobId();
        if ($jobId !== null) {
            // Mark job as processing in persistence layer
            try {
                $this->persistence->markAsProcessing($jobId);
            } catch (\Throwable $e) {
                // If we can't mark as processing, put it back in queue
                $this->baseQueue->push($payload);

                throw $e;
            }
        }

        return $payload;
    }

    /**
     * {@inheritdoc}
     */
    public function peek(): ?JobPayload
    {
        return $this->baseQueue->peek();
    }

    /**
     * {@inheritdoc}
     */
    public function size(): int
    {
        return $this->baseQueue->size();
    }

    /**
     * {@inheritdoc}
     */
    public function clear(): int
    {
        $count = $this->baseQueue->clear();

        // Note: We don't clear persistence layer here as it maintains job history
        // Use separate cleanup methods for persistence if needed

        return $count;
    }

    /**
     * {@inheritdoc}
     */
    public function getStats(): array
    {
        $baseStats = $this->baseQueue->getStats();
        $persistenceStats = $this->persistence->getStats();

        return array_merge($baseStats, [
            'persistence' => $persistenceStats,
            'queue_type' => $this->queueType->value,
        ]);
    }

    /**
     * Mark job as completed
     */
    public function markJobCompleted(JobId $jobId, array $result = []): void
    {
        $this->persistence->markAsCompleted($jobId, $result);
    }

    /**
     * Mark job as failed
     */
    public function markJobFailed(JobId $jobId, string $errorMessage, ?\Throwable $exception = null): void
    {
        $jobState = $this->persistence->markAsFailed($jobId, $errorMessage, $exception);

        // If job can be retried, put it back in queue
        if ($jobState->canRetry()) {
            // Get original job data from metadata
            $jobData = $jobState->metadata['job_data'] ?? null;
            if ($jobData !== null) {
                $retryPayload = JobPayload::create($jobData, $jobState->priority)
                    ->withJobId($jobId)
                    ->withMetadata($jobState->metadata);

                $this->baseQueue->push($retryPayload);
                $this->persistence->markForRetry($jobId, $errorMessage);
            }
        }
    }

    /**
     * Get job state from persistence
     */
    public function getJobState(JobId $jobId): ?\App\Framework\Queue\ValueObjects\JobState
    {
        return $this->persistence->getJobState($jobId);
    }

    /**
     * Get the underlying base queue
     */
    public function getBaseQueue(): Queue
    {
        return $this->baseQueue;
    }

    /**
     * Get the persistence layer
     */
    public function getPersistenceLayer(): JobPersistenceLayer
    {
        return $this->persistence;
    }

    /**
     * Get retryable failed jobs and re-queue them
     */
    public function requeueFailedJobs(int $limit = 50): int
    {
        $retryableJobs = $this->persistence->getRetryableJobs($limit);
        $requeued = 0;

        foreach ($retryableJobs as $jobState) {
            $jobData = $jobState->metadata['job_data'] ?? null;
            if ($jobData === null) {
                continue;
            }

            $retryPayload = JobPayload::create($jobData, $jobState->priority)
                ->withJobId($jobState->jobId)
                ->withMetadata($jobState->metadata);

            $this->baseQueue->push($retryPayload);
            $this->persistence->markForRetry($jobState->jobId, 'Manual retry');
            $requeued++;
        }

        return $requeued;
    }

    /**
     * Clean up old job records
     */
    public function cleanupJobs(?\App\Framework\Core\ValueObjects\Duration $olderThan = null): int
    {
        return $this->persistence->cleanup($olderThan);
    }
}