<?php

declare(strict_types=1);

namespace App\Support\Operations\Reconciliation;

use App\Models\EnvironmentReview;
use App\Models\EvidenceSnapshot;
use App\Models\ManagedEnvironment;
use App\Models\OperationRun;
use App\Models\ReviewPack;
use App\Services\ReviewPackService;
use App\Support\Operations\LifecycleReconciliationReason;
use App\Support\ReviewPackStatus;
use Throwable;

final class ReviewPackArtifactReconciliationAdapter implements OperationRunReconciliationAdapter
{
    public function __construct(
        private readonly ReviewPackService $reviewPacks,
    ) {}

    public function key(): string
    {
        return 'review_pack';
    }

    public function supportedTypes(): array
    {
        return ['environment.review_pack.generate'];
    }

    public function supportsType(string $type): bool
    {
        return $type === 'environment.review_pack.generate';
    }

    public function reconcile(OperationRun $run): ?ReconciliationResult
    {
        if (! $this->supportsType((string) $run->type)) {
            return ReconciliationResult::unsupported(
                reasonCode: LifecycleReconciliationReason::AdapterOutOfSync->value,
                reasonMessage: 'This adapter only supports review pack generation runs.',
                evidence: [
                    'adapter' => $this->key(),
                    'type' => (string) $run->type,
                ],
            );
        }

        $context = is_array($run->context) ? $run->context : [];
        $workspaceId = (int) ($run->workspace_id ?? $context['workspace_id'] ?? 0);
        $tenantId = (int) ($run->managed_environment_id ?? $context['managed_environment_id'] ?? 0);
        $reviewId = is_numeric($context['environment_review_id'] ?? null) ? (int) $context['environment_review_id'] : null;
        $snapshotId = is_numeric($context['evidence_snapshot_id'] ?? null) ? (int) $context['evidence_snapshot_id'] : null;
        $options = $this->normalizeOptions($context);

        $evidence = [
            'adapter' => $this->key(),
            'operation_run_id' => (int) $run->getKey(),
            'workspace_id' => $workspaceId,
            'managed_environment_id' => $tenantId,
            'environment_review_id' => $reviewId,
            'evidence_snapshot_id' => $snapshotId,
            'include_pii' => $options['include_pii'],
            'include_operations' => $options['include_operations'],
        ];

        if ($workspaceId <= 0 || $tenantId <= 0 || ($reviewId === null && $snapshotId === null)) {
            return ReconciliationResult::attentionRequired(
                reasonCode: LifecycleReconciliationReason::AdapterOutOfSync->value,
                reasonMessage: 'The run no longer carries enough review pack scope to reconcile it safely.',
                evidence: $evidence,
            );
        }

        $tenant = ManagedEnvironment::query()
            ->whereKey($tenantId)
            ->where('workspace_id', $workspaceId)
            ->first();

        if (! $tenant instanceof ManagedEnvironment) {
            return ReconciliationResult::attentionRequired(
                reasonCode: LifecycleReconciliationReason::AdapterOutOfSync->value,
                reasonMessage: 'The run no longer points at a valid workspace-owned environment for review pack reconciliation.',
                evidence: $evidence,
            );
        }

        $expectedFingerprint = null;
        $candidatesQuery = ReviewPack::query()
            ->where('workspace_id', $workspaceId)
            ->where('managed_environment_id', $tenantId)
            ->orderByDesc('generated_at')
            ->orderByDesc('id');

        if ($reviewId !== null) {
            $review = EnvironmentReview::query()
                ->whereKey($reviewId)
                ->where('workspace_id', $workspaceId)
                ->where('managed_environment_id', $tenantId)
                ->first();

            if (! $review instanceof EnvironmentReview) {
                return ReconciliationResult::attentionRequired(
                    reasonCode: LifecycleReconciliationReason::AdapterOutOfSync->value,
                    reasonMessage: 'The queued review scope no longer resolves to a current review record safely.',
                    evidence: $evidence,
                );
            }

            $expectedFingerprint = $this->reviewPacks->computeFingerprintForReview($review, $options);
            $candidatesQuery->where('environment_review_id', $reviewId);
        } else {
            $snapshot = EvidenceSnapshot::query()
                ->whereKey($snapshotId)
                ->where('workspace_id', $workspaceId)
                ->where('managed_environment_id', $tenantId)
                ->first();

            if (! $snapshot instanceof EvidenceSnapshot) {
                return ReconciliationResult::attentionRequired(
                    reasonCode: LifecycleReconciliationReason::AdapterOutOfSync->value,
                    reasonMessage: 'The queued evidence basis for this review pack no longer resolves safely.',
                    evidence: $evidence,
                );
            }

            $expectedFingerprint = $this->reviewPacks->computeFingerprintForSnapshot($snapshot, $options);
            $candidatesQuery->where('evidence_snapshot_id', (int) $snapshot->getKey());
        }

        $evidence['expected_fingerprint'] = $expectedFingerprint;

        $candidates = $candidatesQuery
            ->get()
            ->filter(fn (ReviewPack $pack): bool => $this->matchesOptions($pack, $options))
            ->values();

        $evidence['considered_pack_ids'] = $candidates->modelKeys();
        $evidence['considered_packs'] = $candidates
            ->map(fn (ReviewPack $pack): array => $this->reviewPackReference($pack))
            ->values()
            ->all();

        /** @var ReviewPack|null $pack */
        $pack = $candidates->first(fn (ReviewPack $candidate): bool => (string) $candidate->fingerprint === $expectedFingerprint);

        if (! $pack instanceof ReviewPack) {
            if ($candidates->isEmpty()) {
                return ReconciliationResult::notReconciled(
                    reasonCode: LifecycleReconciliationReason::AdapterOutOfSync->value,
                    reasonMessage: 'No matching review pack is available yet for this run.',
                    evidence: $evidence,
                );
            }

            if ($candidates->count() === 1) {
                $candidate = $candidates->first();

                return ReconciliationResult::attentionRequired(
                    reasonCode: LifecycleReconciliationReason::AdapterOutOfSync->value,
                    reasonMessage: 'A review pack exists for this scope, but its fingerprint no longer matches the queued run safely.',
                    evidence: $evidence + ['chosen_review_pack_id' => (int) $candidate->getKey()],
                    related: $this->relatedReviewPackMetadata($candidate),
                    summaryCounts: $this->summaryCounts($candidate),
                );
            }

            return ReconciliationResult::attentionRequired(
                reasonCode: LifecycleReconciliationReason::AdapterOutOfSync->value,
                reasonMessage: 'Multiple review packs match this scope, so the run needs manual review.',
                evidence: $evidence,
            );
        }

        $related = $this->relatedReviewPackMetadata($pack);

        if ($this->isUsablePack($pack)) {
            return ReconciliationResult::reconciledSucceeded(
                reasonCode: LifecycleReconciliationReason::AdapterOutOfSync->value,
                reasonMessage: (int) ($pack->operation_run_id ?? 0) === (int) $run->getKey()
                    ? 'The queued review pack was already completed before the run finished updating.'
                    : 'A matching review pack was already available for this run.',
                evidence: $evidence + ['chosen_review_pack_id' => (int) $pack->getKey()],
                related: $related,
                summaryCounts: $this->summaryCounts($pack),
            );
        }

        if (in_array((string) $pack->status, [
            ReviewPackStatus::Queued->value,
            ReviewPackStatus::Generating->value,
        ], true)) {
            return ReconciliationResult::notReconciled(
                reasonCode: LifecycleReconciliationReason::AdapterOutOfSync->value,
                reasonMessage: (int) ($pack->operation_run_id ?? 0) === (int) $run->getKey()
                    ? 'The queued review pack is still generating and does not prove final output truth yet.'
                    : 'A matching review pack exists, but it is still generating.',
                evidence: $evidence + ['chosen_review_pack_id' => (int) $pack->getKey()],
                related: $related,
            );
        }

        $reasonMessage = match (true) {
            (string) $pack->status === ReviewPackStatus::Expired->value => 'A matching review pack exists, but it is already expired.',
            (string) $pack->status === ReviewPackStatus::Failed->value => 'A matching review pack exists, but generation failed.',
            ! $this->hasShareableFile($pack) => 'A matching review pack exists, but it does not expose a shareable artifact safely yet.',
            default => 'A matching review pack exists, but it is not ready for use.',
        };

        return ReconciliationResult::attentionRequired(
            reasonCode: LifecycleReconciliationReason::AdapterOutOfSync->value,
            reasonMessage: $reasonMessage,
            evidence: $evidence + ['chosen_review_pack_id' => (int) $pack->getKey()],
            related: $related,
            summaryCounts: $this->summaryCounts($pack),
        );
    }

    public function reconcileException(OperationRun $run, Throwable $throwable): ?ReconciliationResult
    {
        return null;
    }

    /**
     * @param  array<string, mixed>  $context
     * @return array{include_pii: bool, include_operations: bool}
     */
    private function normalizeOptions(array $context): array
    {
        return [
            'include_pii' => (bool) ($context['include_pii'] ?? true),
            'include_operations' => (bool) ($context['include_operations'] ?? true),
        ];
    }

    /**
     * @param  array{include_pii: bool, include_operations: bool}  $options
     */
    private function matchesOptions(ReviewPack $pack, array $options): bool
    {
        $packOptions = is_array($pack->options) ? $pack->options : [];

        return (bool) ($packOptions['include_pii'] ?? true) === $options['include_pii']
            && (bool) ($packOptions['include_operations'] ?? true) === $options['include_operations'];
    }

    private function isUsablePack(ReviewPack $pack): bool
    {
        if ((string) $pack->status !== ReviewPackStatus::Ready->value) {
            return false;
        }

        if ($pack->expires_at !== null && $pack->expires_at->isPast()) {
            return false;
        }

        return $this->hasShareableFile($pack);
    }

    private function hasShareableFile(ReviewPack $pack): bool
    {
        return is_string($pack->file_disk) && trim($pack->file_disk) !== ''
            && is_string($pack->file_path) && trim($pack->file_path) !== ''
            && is_string($pack->sha256) && trim($pack->sha256) !== '';
    }

    /**
     * @return array<string, mixed>
     */
    private function relatedReviewPackMetadata(ReviewPack $pack): array
    {
        return array_filter([
            'type' => 'review_pack',
            'id' => (int) $pack->getKey(),
            'status' => (string) $pack->status,
            'fingerprint' => (string) $pack->fingerprint,
            'operation_run_id' => is_numeric($pack->operation_run_id) ? (int) $pack->operation_run_id : null,
            'environment_review_id' => is_numeric($pack->environment_review_id) ? (int) $pack->environment_review_id : null,
            'evidence_snapshot_id' => is_numeric($pack->evidence_snapshot_id) ? (int) $pack->evidence_snapshot_id : null,
            'expires_at' => $pack->expires_at?->toIso8601String(),
        ], static fn (mixed $value): bool => $value !== null && $value !== []);
    }

    /**
     * @return array<string, mixed>
     */
    private function reviewPackReference(ReviewPack $pack): array
    {
        return [
            'id' => (int) $pack->getKey(),
            'status' => (string) $pack->status,
            'fingerprint' => (string) $pack->fingerprint,
            'operation_run_id' => is_numeric($pack->operation_run_id) ? (int) $pack->operation_run_id : null,
            'environment_review_id' => is_numeric($pack->environment_review_id) ? (int) $pack->environment_review_id : null,
            'evidence_snapshot_id' => is_numeric($pack->evidence_snapshot_id) ? (int) $pack->evidence_snapshot_id : null,
        ];
    }

    /**
     * @return array<string, int>
     */
    private function summaryCounts(ReviewPack $pack): array
    {
        $summary = is_array($pack->summary) ? $pack->summary : [];

        return array_filter([
            'finding_count' => is_numeric($summary['finding_count'] ?? null) ? (int) $summary['finding_count'] : null,
            'report_count' => is_numeric($summary['report_count'] ?? null) ? (int) $summary['report_count'] : null,
            'operation_count' => is_numeric($summary['operation_count'] ?? null) ? (int) $summary['operation_count'] : null,
        ], static fn (mixed $value): bool => is_int($value));
    }
}