<?php

declare(strict_types=1);

namespace App\Support\Operations\Reconciliation;

use App\Models\EnvironmentReview;
use App\Models\OperationRun;
use App\Support\EnvironmentReviewStatus;
use App\Support\Operations\LifecycleReconciliationReason;
use Illuminate\Support\Collection;

final class EnvironmentReviewComposeDecision
{
    public const string ADAPTER = 'environment_review_compose';

    public function evaluate(OperationRun $run): ReconciliationResult
    {
        if ((string) $run->type !== 'environment.review.compose') {
            return ReconciliationResult::unsupported(
                reasonCode: LifecycleReconciliationReason::AdapterOutOfSync->value,
                reasonMessage: 'This adapter only supports environment review composition runs.',
                evidence: [
                    'adapter' => self::ADAPTER,
                    '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);
        $fingerprint = is_string($context['review_fingerprint'] ?? null)
            ? trim((string) $context['review_fingerprint'])
            : '';
        $explicitReviewId = is_numeric($context['review_id'] ?? null)
            ? (int) $context['review_id']
            : null;

        $evidence = [
            'adapter' => self::ADAPTER,
            'operation_run_id' => (int) $run->getKey(),
            'workspace_id' => $workspaceId,
            'managed_environment_id' => $tenantId,
            'fingerprint' => $fingerprint,
            'explicit_review_id' => $explicitReviewId,
        ];

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

        $candidates = EnvironmentReview::query()
            ->forWorkspace($workspaceId)
            ->forTenant($tenantId)
            ->where('fingerprint', $fingerprint)
            ->orderByDesc('id')
            ->get();

        $evidence['considered_review_ids'] = $candidates->modelKeys();
        $evidence['considered_reviews'] = $candidates
            ->map(fn (EnvironmentReview $review): array => $this->reviewReference($review))
            ->values()
            ->all();

        $explicitReview = $explicitReviewId !== null
            ? $candidates->firstWhere('id', $explicitReviewId)
            : null;

        if ($explicitReviewId !== null && ! $explicitReview instanceof EnvironmentReview) {
            return ReconciliationResult::attentionRequired(
                reasonCode: LifecycleReconciliationReason::AdapterOutOfSync->value,
                reasonMessage: 'The originally queued review no longer matches the current review truth safely.',
                evidence: $evidence + ['explicit_review_missing' => true],
            );
        }

        if ($explicitReview instanceof EnvironmentReview) {
            $lineageDecision = $this->evaluateExplicitReviewLineage($explicitReview, $candidates, $evidence);

            if ($lineageDecision instanceof ReconciliationResult) {
                return $lineageDecision;
            }
        }

        $usable = $candidates->filter(fn (EnvironmentReview $review): bool => $this->isUsableReview($review))->values();

        if ($usable->count() === 1) {
            /** @var EnvironmentReview $review */
            $review = $usable->first();

            return ReconciliationResult::reconciledSucceeded(
                reasonCode: LifecycleReconciliationReason::AdapterOutOfSync->value,
                reasonMessage: $review->status === EnvironmentReviewStatus::Published->value
                    ? 'A matching published review was already available for this run.'
                    : 'A matching ready review was already available for this run.',
                evidence: $evidence + ['chosen_review_id' => (int) $review->getKey()],
                related: $this->relatedReviewMetadata($review),
                summaryCounts: $this->summaryCounts($review),
            );
        }

        if ($usable->count() > 1) {
            return ReconciliationResult::attentionRequired(
                reasonCode: LifecycleReconciliationReason::AdapterOutOfSync->value,
                reasonMessage: 'Multiple matching reviews are available, so this run needs manual review.',
                evidence: $evidence + ['ambiguous_review_ids' => $usable->modelKeys()],
            );
        }

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

        if ($candidates->contains(fn (EnvironmentReview $review): bool => $this->isBlockingState($review))) {
            $blockingReview = $candidates->first(fn (EnvironmentReview $review): bool => $this->isBlockingState($review));

            if ($blockingReview instanceof EnvironmentReview && (int) ($blockingReview->operation_run_id ?? 0) === (int) $run->getKey()) {
                return ReconciliationResult::notReconciled(
                    reasonCode: LifecycleReconciliationReason::AdapterOutOfSync->value,
                    reasonMessage: 'The queued review is still composing and does not prove final review truth yet.',
                    evidence: $evidence + [
                        'chosen_review_id' => (int) $blockingReview->getKey(),
                    ],
                    related: $this->relatedReviewMetadata($blockingReview),
                );
            }

            return ReconciliationResult::blocked(
                reasonCode: LifecycleReconciliationReason::AdapterOutOfSync->value,
                reasonMessage: 'A matching review exists, but it is not ready yet.',
                evidence: $evidence + [
                    'chosen_review_id' => $blockingReview instanceof EnvironmentReview ? (int) $blockingReview->getKey() : null,
                ],
                related: $blockingReview instanceof EnvironmentReview ? $this->relatedReviewMetadata($blockingReview) : [],
                summaryCounts: $blockingReview instanceof EnvironmentReview ? $this->summaryCounts($blockingReview) : [],
            );
        }

        return ReconciliationResult::attentionRequired(
            reasonCode: LifecycleReconciliationReason::AdapterOutOfSync->value,
            reasonMessage: 'Review lineage needs operator confirmation before this run can be trusted.',
            evidence: $evidence,
        );
    }

    /**
     * @param  Collection<int, EnvironmentReview>  $candidates
     * @param  array<string, mixed>  $evidence
     */
    private function evaluateExplicitReviewLineage(
        EnvironmentReview $review,
        Collection $candidates,
        array $evidence,
    ): ?ReconciliationResult {
        if ($this->isUsableReview($review)) {
            return ReconciliationResult::reconciledSucceeded(
                reasonCode: LifecycleReconciliationReason::AdapterOutOfSync->value,
                reasonMessage: $review->status === EnvironmentReviewStatus::Published->value
                    ? 'The queued review was already published before the run finished updating.'
                    : 'The queued review was already ready before the run finished updating.',
                evidence: $evidence + ['chosen_review_id' => (int) $review->getKey()],
                related: $this->relatedReviewMetadata($review),
                summaryCounts: $this->summaryCounts($review),
            );
        }

        $successorId = is_numeric($review->superseded_by_review_id)
            ? (int) $review->superseded_by_review_id
            : null;

        if ($successorId === null) {
            if ($this->isBlockingState($review)) {
                if ($candidates->contains(fn (EnvironmentReview $candidate): bool => $this->isUsableReview($candidate))) {
                    return null;
                }

                if ((int) ($review->operation_run_id ?? 0) === (int) ($evidence['operation_run_id'] ?? 0)) {
                    return ReconciliationResult::notReconciled(
                        reasonCode: LifecycleReconciliationReason::AdapterOutOfSync->value,
                        reasonMessage: 'The queued review is still composing and does not prove final review truth yet.',
                        evidence: $evidence + ['chosen_review_id' => (int) $review->getKey()],
                        related: $this->relatedReviewMetadata($review),
                    );
                }

                return ReconciliationResult::blocked(
                    reasonCode: LifecycleReconciliationReason::AdapterOutOfSync->value,
                    reasonMessage: 'The queued review still exists, but it is not ready yet.',
                    evidence: $evidence + ['chosen_review_id' => (int) $review->getKey()],
                    related: $this->relatedReviewMetadata($review),
                    summaryCounts: $this->summaryCounts($review),
                );
            }

            if ($review->status === EnvironmentReviewStatus::Superseded->value) {
                return ReconciliationResult::attentionRequired(
                    reasonCode: LifecycleReconciliationReason::AdapterOutOfSync->value,
                    reasonMessage: 'This run points at superseded review lineage that cannot be resolved safely.',
                    evidence: $evidence + ['lineage_review_id' => (int) $review->getKey()],
                    related: $this->relatedReviewMetadata($review),
                );
            }

            return null;
        }

        /** @var EnvironmentReview|null $successor */
        $successor = $candidates->firstWhere('id', $successorId);

        if (! $successor instanceof EnvironmentReview) {
            return ReconciliationResult::attentionRequired(
                reasonCode: LifecycleReconciliationReason::AdapterOutOfSync->value,
                reasonMessage: 'A successor review was recorded, but the matching review truth could not be resolved safely.',
                evidence: $evidence + [
                    'lineage_review_id' => (int) $review->getKey(),
                    'lineage_successor_review_id' => $successorId,
                ],
                related: $this->relatedReviewMetadata($review),
            );
        }

        if ($this->isUsableReview($successor)) {
            return ReconciliationResult::reconciledSucceeded(
                reasonCode: LifecycleReconciliationReason::AdapterOutOfSync->value,
                reasonMessage: 'A ready successor review was already available for this run.',
                evidence: $evidence + [
                    'lineage_review_id' => (int) $review->getKey(),
                    'chosen_review_id' => (int) $successor->getKey(),
                ],
                related: $this->relatedReviewMetadata($successor) + [
                    'lineage_review_id' => (int) $review->getKey(),
                ],
                summaryCounts: $this->summaryCounts($successor),
            );
        }

        if ($this->isBlockingState($successor)) {
            return ReconciliationResult::blocked(
                reasonCode: LifecycleReconciliationReason::AdapterOutOfSync->value,
                reasonMessage: 'A successor review exists, but it is not ready yet.',
                evidence: $evidence + [
                    'lineage_review_id' => (int) $review->getKey(),
                    'chosen_review_id' => (int) $successor->getKey(),
                ],
                related: $this->relatedReviewMetadata($successor) + [
                    'lineage_review_id' => (int) $review->getKey(),
                ],
                summaryCounts: $this->summaryCounts($successor),
            );
        }

        return ReconciliationResult::attentionRequired(
            reasonCode: LifecycleReconciliationReason::AdapterOutOfSync->value,
            reasonMessage: 'The successor review needs operator review before this run can be trusted.',
            evidence: $evidence + [
                'lineage_review_id' => (int) $review->getKey(),
                'chosen_review_id' => (int) $successor->getKey(),
            ],
            related: $this->relatedReviewMetadata($successor) + [
                'lineage_review_id' => (int) $review->getKey(),
            ],
        );
    }

    private function isUsableReview(EnvironmentReview $review): bool
    {
        return in_array((string) $review->status, [
            EnvironmentReviewStatus::Ready->value,
            EnvironmentReviewStatus::Published->value,
        ], true);
    }

    private function isBlockingState(EnvironmentReview $review): bool
    {
        return in_array((string) $review->status, [
            EnvironmentReviewStatus::Draft->value,
            EnvironmentReviewStatus::Failed->value,
        ], true);
    }

    /**
     * @return array<string, mixed>
     */
    private function relatedReviewMetadata(EnvironmentReview $review): array
    {
        return array_filter([
            'type' => 'environment_review',
            'id' => (int) $review->getKey(),
            'status' => (string) $review->status,
            'fingerprint' => (string) $review->fingerprint,
            'operation_run_id' => is_numeric($review->operation_run_id) ? (int) $review->operation_run_id : null,
            'superseded_by_review_id' => is_numeric($review->superseded_by_review_id) ? (int) $review->superseded_by_review_id : null,
        ], static fn (mixed $value): bool => $value !== null && $value !== []);
    }

    /**
     * @return array<string, mixed>
     */
    private function reviewReference(EnvironmentReview $review): array
    {
        return [
            'id' => (int) $review->getKey(),
            'status' => (string) $review->status,
            'operation_run_id' => is_numeric($review->operation_run_id) ? (int) $review->operation_run_id : null,
            'superseded_by_review_id' => is_numeric($review->superseded_by_review_id) ? (int) $review->superseded_by_review_id : null,
        ];
    }

    /**
     * @return array<string, int>
     */
    private function summaryCounts(EnvironmentReview $review): array
    {
        $summary = is_array($review->summary) ? $review->summary : [];
        $counts = [
            'finding_count' => is_numeric($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,
            'errors_recorded' => 0,
        ];

        return array_filter($counts, static fn (mixed $value): bool => is_int($value));
    }
}