<?php

declare(strict_types=1);

namespace App\Support\Operations\Reconciliation;

use App\Models\BaselineSnapshot;
use App\Models\OperationRun;
use App\Support\Baselines\BaselineReasonCodes;
use App\Support\Baselines\BaselineSnapshotLifecycleState;
use App\Support\OperationCatalog;
use App\Support\OperationRunOutcome;
use App\Support\OperationRunStatus;
use App\Support\OperationRunType;
use App\Support\Operations\LifecycleReconciliationReason;
use Throwable;

final class BaselineCaptureReconciliationAdapter implements OperationRunReconciliationAdapter
{
    public function key(): string
    {
        return 'baseline_capture';
    }

    public function supportedTypes(): array
    {
        return [OperationRunType::BaselineCapture->value];
    }

    public function supportsType(string $type): bool
    {
        return OperationCatalog::canonicalCode($type) === OperationRunType::BaselineCapture->value;
    }

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

        $context = is_array($run->context) ? $run->context : [];
        $profileId = is_numeric($context['baseline_profile_id'] ?? null) ? (int) $context['baseline_profile_id'] : null;
        $reasonCode = $this->captureReasonCode($context);
        $subjectsTotal = $this->intValue(data_get($context, 'baseline_capture.subjects_total'));
        $resumeToken = data_get($context, 'baseline_capture.resume_token');
        $gapsCount = $this->intValue(data_get($context, 'baseline_capture.gaps.count'));
        $itemsCaptured = $this->intValue(data_get($context, 'result.items_captured'));

        $evidence = [
            'adapter' => $this->key(),
            'operation_run_id' => (int) $run->getKey(),
            'workspace_id' => (int) $run->workspace_id,
            'baseline_profile_id' => $profileId,
            'reason_code' => $reasonCode,
            'subjects_total' => $subjectsTotal,
            'gaps_count' => $gapsCount,
            'items_captured' => $itemsCaptured,
            'resume_token_present' => is_string($resumeToken) && trim($resumeToken) !== '',
        ];

        [$snapshot, $scopeProblem] = $this->resolveSnapshot($run, $profileId);

        if ($scopeProblem !== null) {
            return ReconciliationResult::notReconciled(
                reasonCode: LifecycleReconciliationReason::AdapterOutOfSync->value,
                reasonMessage: $scopeProblem,
                evidence: $evidence,
            );
        }

        if ($snapshot instanceof BaselineSnapshot) {
            $itemsCaptured = max($itemsCaptured, $this->intValue(data_get($snapshot->summary_jsonb, 'total_items')));
            $subjectsTotal = max($subjectsTotal, $itemsCaptured);
            $gapsCount = max($gapsCount, $this->intValue(data_get($snapshot->summary_jsonb, 'gaps.count')));
            $reasonCode ??= is_string(data_get($snapshot->completion_meta_jsonb, 'finalization_reason_code'))
                ? (string) data_get($snapshot->completion_meta_jsonb, 'finalization_reason_code')
                : null;

            $summaryCounts = $this->summaryCounts($subjectsTotal, $itemsCaptured);
            $related = [
                'type' => 'baseline_snapshot',
                'id' => (int) $snapshot->getKey(),
                'lifecycle_state' => $snapshot->lifecycleState()->value,
                'baseline_profile_id' => (int) $snapshot->baseline_profile_id,
            ];

            if ($snapshot->lifecycleState() === BaselineSnapshotLifecycleState::Complete) {
                if ((is_string($resumeToken) && trim($resumeToken) !== '') || $gapsCount > 0 || $itemsCaptured < $subjectsTotal) {
                    return new ReconciliationResult(
                        decision: 'reconciled_partially_succeeded',
                        status: OperationRunStatus::Completed->value,
                        outcome: OperationRunOutcome::PartiallySucceeded->value,
                        reasonCode: LifecycleReconciliationReason::AdapterOutOfSync->value,
                        reasonMessage: 'The baseline capture recorded a usable snapshot, but evidence gaps still limit it.',
                        evidence: $evidence + ['chosen_snapshot_id' => (int) $snapshot->getKey()],
                        related: $related,
                        summaryCounts: $summaryCounts,
                        failures: [[
                            'code' => 'baseline.capture.partial',
                            'reason_code' => LifecycleReconciliationReason::AdapterOutOfSync->value,
                            'message' => 'The baseline capture recorded a usable snapshot, but evidence gaps still limit it.',
                        ]],
                        safeForAutoCompletion: true,
                    );
                }

                return ReconciliationResult::reconciledSucceeded(
                    reasonCode: LifecycleReconciliationReason::AdapterOutOfSync->value,
                    reasonMessage: 'The baseline capture already produced a complete snapshot before the run finished updating.',
                    evidence: $evidence + ['chosen_snapshot_id' => (int) $snapshot->getKey()],
                    related: $related,
                    summaryCounts: $summaryCounts,
                );
            }

            if ($reasonCode === BaselineReasonCodes::CAPTURE_ZERO_SUBJECTS) {
                return new ReconciliationResult(
                    decision: 'reconciled_partially_succeeded',
                    status: OperationRunStatus::Completed->value,
                    outcome: OperationRunOutcome::PartiallySucceeded->value,
                    reasonCode: LifecycleReconciliationReason::AdapterOutOfSync->value,
                    reasonMessage: 'The baseline capture finished without a usable baseline because no governed subjects were in scope.',
                    evidence: $evidence + ['chosen_snapshot_id' => (int) $snapshot->getKey()],
                    related: $related,
                    summaryCounts: $summaryCounts,
                    failures: [[
                        'code' => 'baseline.capture.partial',
                        'reason_code' => LifecycleReconciliationReason::AdapterOutOfSync->value,
                        'message' => 'The baseline capture finished without a usable baseline because no governed subjects were in scope.',
                    ]],
                    safeForAutoCompletion: true,
                );
            }

            if ($snapshot->lifecycleState() === BaselineSnapshotLifecycleState::Building) {
                return ReconciliationResult::notReconciled(
                    reasonCode: LifecycleReconciliationReason::AdapterOutOfSync->value,
                    reasonMessage: 'The baseline snapshot is still building and does not prove final capture truth yet.',
                    evidence: $evidence + ['chosen_snapshot_id' => (int) $snapshot->getKey()],
                    related: $related,
                );
            }

            return ReconciliationResult::failedUnrecoverable(
                reasonCode: LifecycleReconciliationReason::AdapterOutOfSync->value,
                reasonMessage: 'The baseline capture created a snapshot row, but it never became usable baseline truth.',
                evidence: $evidence + ['chosen_snapshot_id' => (int) $snapshot->getKey()],
                related: $related,
                summaryCounts: $summaryCounts,
            );
        }

        if ($reasonCode !== null && in_array($reasonCode, $this->blockedReasonCodes(), true)) {
            return ReconciliationResult::blocked(
                reasonCode: LifecycleReconciliationReason::AdapterOutOfSync->value,
                reasonMessage: $this->blockedReasonMessage($reasonCode, (bool) data_get($context, 'baseline_capture.eligibility.changed_after_enqueue')),
                evidence: $evidence,
                summaryCounts: $this->summaryCounts($subjectsTotal, $itemsCaptured),
            );
        }

        if ($reasonCode !== null && in_array($reasonCode, [
            BaselineReasonCodes::SNAPSHOT_CAPTURE_FAILED,
            BaselineReasonCodes::SNAPSHOT_COMPLETION_PROOF_FAILED,
            BaselineReasonCodes::SNAPSHOT_INCOMPLETE,
            BaselineReasonCodes::SNAPSHOT_LEGACY_NO_PROOF,
            BaselineReasonCodes::SNAPSHOT_LEGACY_CONTRADICTORY,
        ], true)) {
            return ReconciliationResult::failedUnrecoverable(
                reasonCode: LifecycleReconciliationReason::AdapterOutOfSync->value,
                reasonMessage: 'The baseline capture stopped before it could prove a usable snapshot.',
                evidence: $evidence,
                summaryCounts: $this->summaryCounts($subjectsTotal, $itemsCaptured),
            );
        }

        return ReconciliationResult::notReconciled(
            reasonCode: LifecycleReconciliationReason::AdapterOutOfSync->value,
            reasonMessage: 'No current-scope baseline snapshot proof is available yet for this run.',
            evidence: $evidence,
        );
    }

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

    /**
     * @return array{0:BaselineSnapshot|null,1:?string}
     */
    private function resolveSnapshot(OperationRun $run, ?int $profileId): array
    {
        $context = is_array($run->context) ? $run->context : [];
        $snapshotId = is_numeric($context['baseline_snapshot_id'] ?? null)
            ? (int) $context['baseline_snapshot_id']
            : (is_numeric(data_get($context, 'result.snapshot_id')) ? (int) data_get($context, 'result.snapshot_id') : null);

        if ($snapshotId !== null) {
            $candidate = BaselineSnapshot::query()->whereKey($snapshotId)->first();

            if (! $candidate instanceof BaselineSnapshot) {
                return [null, null];
            }

            if ((int) $candidate->workspace_id !== (int) $run->workspace_id || ($profileId !== null && (int) $candidate->baseline_profile_id !== $profileId)) {
                return [null, 'The recorded baseline snapshot no longer matches the queued capture scope safely.'];
            }

            return [$candidate, null];
        }

        if ($profileId === null) {
            return [null, null];
        }

        $candidates = BaselineSnapshot::query()
            ->where('workspace_id', (int) $run->workspace_id)
            ->where('baseline_profile_id', $profileId)
            ->where('completion_meta_jsonb->producer_run_id', (int) $run->getKey())
            ->orderByDesc('id')
            ->get();

        if ($candidates->count() > 1) {
            return [null, 'Multiple baseline snapshots point at this run, so reconciliation stays fail-closed.'];
        }

        return [$candidates->first(), null];
    }

    /**
     * @param  array<string, mixed>  $context
     */
    private function captureReasonCode(array $context): ?string
    {
        foreach ([
            data_get($context, 'baseline_capture.reason_code'),
            $context['reason_code'] ?? null,
            data_get($context, 'result.snapshot_reason_code'),
        ] as $candidate) {
            if (is_string($candidate) && trim($candidate) !== '') {
                return trim($candidate);
            }
        }

        return null;
    }

    /**
     * @return array<int, string>
     */
    private function blockedReasonCodes(): array
    {
        return [
            BaselineReasonCodes::CAPTURE_MISSING_SOURCE_TENANT,
            BaselineReasonCodes::CAPTURE_PROFILE_NOT_ACTIVE,
            BaselineReasonCodes::CAPTURE_ROLLOUT_DISABLED,
            BaselineReasonCodes::CAPTURE_INVALID_SCOPE,
            BaselineReasonCodes::CAPTURE_UNSUPPORTED_SCOPE,
            BaselineReasonCodes::CAPTURE_INVENTORY_MISSING,
            BaselineReasonCodes::CAPTURE_INVENTORY_BLOCKED,
            BaselineReasonCodes::CAPTURE_INVENTORY_FAILED,
            BaselineReasonCodes::CAPTURE_UNUSABLE_COVERAGE,
        ];
    }

    private function blockedReasonMessage(string $reasonCode, bool $changedAfterEnqueue): string
    {
        return match ($reasonCode) {
            BaselineReasonCodes::CAPTURE_INVENTORY_MISSING => 'The baseline capture could not continue because no current inventory basis was available.',
            BaselineReasonCodes::CAPTURE_INVENTORY_BLOCKED => $changedAfterEnqueue
                ? 'The baseline capture stopped because the latest inventory sync changed after the run was queued.'
                : 'The baseline capture was blocked because the latest inventory sync was blocked.',
            BaselineReasonCodes::CAPTURE_INVENTORY_FAILED => $changedAfterEnqueue
                ? 'The baseline capture stopped because the latest inventory sync failed after the run was queued.'
                : 'The baseline capture was blocked because the latest inventory sync failed.',
            BaselineReasonCodes::CAPTURE_UNUSABLE_COVERAGE => $changedAfterEnqueue
                ? 'The baseline capture stopped because the latest inventory coverage became unusable after the run was queued.'
                : 'The baseline capture could not produce a usable baseline because the latest inventory coverage was not credible.',
            default => 'The baseline capture was blocked before it could produce trustworthy snapshot proof.',
        };
    }

    /**
     * @return array<string, int>
     */
    private function summaryCounts(int $subjectsTotal, int $itemsCaptured): array
    {
        $total = max(0, $subjectsTotal);
        $succeeded = max(0, $itemsCaptured);
        $total = max($total, $succeeded);

        return [
            'total' => $total,
            'processed' => $total,
            'succeeded' => $succeeded,
            'failed' => max(0, $total - $succeeded),
        ];
    }

    private function intValue(mixed $value): int
    {
        return is_numeric($value) ? (int) $value : 0;
    }
}