<?php

declare(strict_types=1);

namespace App\Services;

use App\Exceptions\ReviewPackEvidenceResolutionException;
use App\Jobs\GenerateReviewPackJob;
use App\Models\EvidenceSnapshot;
use App\Models\OperationRun;
use App\Models\ReviewPack;
use App\Models\Tenant;
use App\Models\TenantReview;
use App\Models\User;
use App\Services\Audit\WorkspaceAuditLogger;
use App\Services\Evidence\EvidenceResolutionRequest;
use App\Services\Evidence\EvidenceSnapshotResolver;
use App\Support\Audit\AuditActionId;
use App\Support\OperationRunType;
use App\Support\ReviewPackStatus;
use Illuminate\Support\Facades\URL;

class ReviewPackService
{
    public function __construct(
        private OperationRunService $operationRunService,
        private EvidenceSnapshotResolver $snapshotResolver,
        private WorkspaceAuditLogger $auditLogger,
    ) {}

    /**
     * @var list<string>
     */
    private const REQUIRED_EVIDENCE_DIMENSIONS = [
        'findings_summary',
        'permission_posture',
        'entra_admin_roles',
        'baseline_drift_posture',
        'operations_summary',
    ];

    /**
     * Create an OperationRun + ReviewPack and dispatch the generation job.
     *
     * @param  array<string, mixed>  $options
     */
    public function generate(Tenant $tenant, User $user, array $options = []): ReviewPack
    {
        $options = $this->normalizeOptions($options);
        $snapshot = $this->resolveSnapshot($tenant);
        $fingerprint = $this->computeFingerprintForSnapshot($snapshot, $options);

        $existing = $this->findExistingPack($tenant, $fingerprint);
        if ($existing instanceof ReviewPack) {
            return $existing;
        }

        $operationRun = $this->operationRunService->ensureRun(
            tenant: $tenant,
            type: OperationRunType::ReviewPackGenerate->value,
            inputs: [
                'include_pii' => $options['include_pii'],
                'include_operations' => $options['include_operations'],
                'evidence_snapshot_id' => (int) $snapshot->getKey(),
            ],
            initiator: $user,
        );

        if (! $operationRun->wasRecentlyCreated) {
            $queuedPack = $this->findPackForRun($tenant, $operationRun);

            if ($queuedPack instanceof ReviewPack) {
                return $queuedPack;
            }
        }

        $reviewPack = ReviewPack::create([
            'tenant_id' => (int) $tenant->getKey(),
            'workspace_id' => (int) $tenant->workspace_id,
            'operation_run_id' => (int) $operationRun->getKey(),
            'evidence_snapshot_id' => (int) $snapshot->getKey(),
            'initiated_by_user_id' => (int) $user->getKey(),
            'status' => ReviewPackStatus::Queued->value,
            'options' => $options,
            'summary' => [
                'risk_acceptance' => is_array($snapshot->summary['risk_acceptance'] ?? null)
                    ? $snapshot->summary['risk_acceptance']
                    : [],
                'evidence_resolution' => [
                    'outcome' => 'resolved',
                    'snapshot_id' => (int) $snapshot->getKey(),
                    'snapshot_fingerprint' => (string) $snapshot->fingerprint,
                    'completeness_state' => (string) $snapshot->completeness_state,
                    'required_dimensions' => self::REQUIRED_EVIDENCE_DIMENSIONS,
                ],
            ],
        ]);

        $this->operationRunService->dispatchOrFail($operationRun, function () use ($reviewPack, $operationRun): void {
            GenerateReviewPackJob::dispatch(
                reviewPackId: (int) $reviewPack->getKey(),
                operationRunId: (int) $operationRun->getKey(),
            );
        });

        return $reviewPack;
    }

    /**
     * Create a review-derived executive pack.
     *
     * @param  array<string, mixed>  $options
     */
    public function generateFromReview(TenantReview $review, User $user, array $options = []): ReviewPack
    {
        $review->loadMissing(['tenant', 'evidenceSnapshot', 'sections']);

        $tenant = $review->tenant;
        $snapshot = $review->evidenceSnapshot;

        if (! $tenant instanceof Tenant || ! $snapshot instanceof EvidenceSnapshot) {
            throw new \InvalidArgumentException('Review exports require an anchored evidence snapshot.');
        }

        $options = $this->normalizeOptions($options);
        $fingerprint = $this->computeFingerprintForReview($review, $options);
        $existing = $this->findExistingPackForReview($review, $fingerprint);

        if ($existing instanceof ReviewPack) {
            $this->logReviewExport($review, $user, $existing, 'reused');

            return $existing;
        }

        $operationRun = $this->operationRunService->ensureRun(
            tenant: $tenant,
            type: OperationRunType::ReviewPackGenerate->value,
            inputs: [
                'tenant_review_id' => (int) $review->getKey(),
                'include_pii' => $options['include_pii'],
                'include_operations' => $options['include_operations'],
                'evidence_snapshot_id' => (int) $snapshot->getKey(),
            ],
            initiator: $user,
        );

        if (! $operationRun->wasRecentlyCreated) {
            $queuedPack = $this->findPackForRun($tenant, $operationRun);

            if ($queuedPack instanceof ReviewPack) {
                $this->logReviewExport($review, $user, $queuedPack, 'reused_active_run');

                return $queuedPack;
            }
        }

        $reviewPack = ReviewPack::create([
            'tenant_id' => (int) $tenant->getKey(),
            'workspace_id' => (int) $tenant->workspace_id,
            'tenant_review_id' => (int) $review->getKey(),
            'operation_run_id' => (int) $operationRun->getKey(),
            'evidence_snapshot_id' => (int) $snapshot->getKey(),
            'initiated_by_user_id' => (int) $user->getKey(),
            'status' => ReviewPackStatus::Queued->value,
            'options' => $options,
            'summary' => [
                'tenant_review_id' => (int) $review->getKey(),
                'review_status' => (string) $review->status,
                'review_completeness_state' => (string) $review->completeness_state,
                'section_count' => $review->sections->count(),
                'evidence_resolution' => [
                    'outcome' => 'resolved',
                    'snapshot_id' => (int) $snapshot->getKey(),
                    'snapshot_fingerprint' => (string) $snapshot->fingerprint,
                    'completeness_state' => (string) $snapshot->completeness_state,
                    'required_dimensions' => self::REQUIRED_EVIDENCE_DIMENSIONS,
                ],
            ],
        ]);

        $this->operationRunService->dispatchOrFail($operationRun, function () use ($reviewPack, $operationRun): void {
            GenerateReviewPackJob::dispatch(
                reviewPackId: (int) $reviewPack->getKey(),
                operationRunId: (int) $operationRun->getKey(),
            );
        });

        $this->logReviewExport($review, $user, $reviewPack, 'queued');

        return $reviewPack;
    }

    /**
     * Compute a deterministic fingerprint for deduplication.
     *
     * @param  array<string, mixed>  $options
     */
    public function computeFingerprint(Tenant $tenant, array $options): string
    {
        return $this->computeFingerprintForSnapshot($this->resolveSnapshot($tenant), $this->normalizeOptions($options));
    }

    /**
     * Generate a signed download URL for a review pack.
     */
    public function generateDownloadUrl(ReviewPack $pack): string
    {
        $ttlMinutes = (int) config('tenantpilot.review_pack.download_url_ttl_minutes', 60);

        return URL::signedRoute(
            'admin.review-packs.download',
            ['reviewPack' => $pack->getKey()],
            now()->addMinutes($ttlMinutes),
        );
    }

    /**
     * Find an existing ready, non-expired pack with the same fingerprint.
     */
    public function findExistingPack(Tenant $tenant, string $fingerprint): ?ReviewPack
    {
        return ReviewPack::query()
            ->forTenant((int) $tenant->getKey())
            ->ready()
            ->where('fingerprint', $fingerprint)
            ->where('expires_at', '>', now())
            ->first();
    }

    public function findExistingPackForReview(TenantReview $review, string $fingerprint): ?ReviewPack
    {
        return ReviewPack::query()
            ->where('tenant_review_id', (int) $review->getKey())
            ->ready()
            ->where('fingerprint', $fingerprint)
            ->where('expires_at', '>', now())
            ->first();
    }

    /**
     * Check if a generation run is currently active for this tenant.
     */
    public function checkActiveRun(Tenant $tenant): bool
    {
        return OperationRun::query()
            ->where('tenant_id', (int) $tenant->getKey())
            ->where('type', OperationRunType::ReviewPackGenerate->value)
            ->active()
            ->exists();
    }

    public function checkActiveRunForReview(TenantReview $review): bool
    {
        return OperationRun::query()
            ->where('tenant_id', (int) $review->tenant_id)
            ->where('type', OperationRunType::ReviewPackGenerate->value)
            ->whereJsonContains('context->tenant_review_id', (int) $review->getKey())
            ->active()
            ->exists();
    }

    /**
     * @param  array<string, mixed>  $options
     * @return array{include_pii: bool, include_operations: bool}
     */
    private function normalizeOptions(array $options): array
    {
        return [
            'include_pii' => (bool) ($options['include_pii'] ?? config('tenantpilot.review_pack.include_pii_default', true)),
            'include_operations' => (bool) ($options['include_operations'] ?? config('tenantpilot.review_pack.include_operations_default', true)),
        ];
    }

    private function computeFingerprintForSnapshot(EvidenceSnapshot $snapshot, array $options): string
    {
        $data = [
            'tenant_id' => (int) $snapshot->tenant_id,
            'evidence_snapshot_id' => (int) $snapshot->getKey(),
            'evidence_fingerprint' => (string) $snapshot->fingerprint,
            'include_pii' => (bool) ($options['include_pii'] ?? true),
            'include_operations' => (bool) ($options['include_operations'] ?? true),
        ];

        return hash('sha256', json_encode($data, JSON_THROW_ON_ERROR));
    }

    public function computeFingerprintForReview(TenantReview $review, array $options): string
    {
        $data = [
            'tenant_review_id' => (int) $review->getKey(),
            'review_fingerprint' => (string) $review->fingerprint,
            'review_status' => (string) $review->status,
            'include_pii' => (bool) ($options['include_pii'] ?? true),
            'include_operations' => (bool) ($options['include_operations'] ?? true),
        ];

        return hash('sha256', json_encode($data, JSON_THROW_ON_ERROR));
    }

    private function resolveSnapshot(Tenant $tenant): EvidenceSnapshot
    {
        $result = $this->snapshotResolver->resolve(new EvidenceResolutionRequest(
            workspaceId: (int) $tenant->workspace_id,
            tenantId: (int) $tenant->getKey(),
            requiredDimensions: self::REQUIRED_EVIDENCE_DIMENSIONS,
        ));

        if (! $result->isResolved()) {
            throw new ReviewPackEvidenceResolutionException($result);
        }

        return $result->snapshot;
    }

    private function findPackForRun(Tenant $tenant, OperationRun $operationRun): ?ReviewPack
    {
        return ReviewPack::query()
            ->where('tenant_id', (int) $tenant->getKey())
            ->where('operation_run_id', (int) $operationRun->getKey())
            ->latest('id')
            ->first();
    }

    private function logReviewExport(TenantReview $review, User $user, ReviewPack $reviewPack, string $mode): void
    {
        $tenant = $review->tenant;

        if (! $tenant instanceof Tenant) {
            return;
        }

        $this->auditLogger->log(
            workspace: $tenant->workspace,
            action: AuditActionId::TenantReviewExported,
            context: [
                'metadata' => [
                    'review_id' => (int) $review->getKey(),
                    'review_pack_id' => (int) $reviewPack->getKey(),
                    'mode' => $mode,
                    'status' => (string) $reviewPack->status,
                ],
            ],
            actor: $user,
            resourceType: 'tenant_review',
            resourceId: (string) $review->getKey(),
            targetLabel: sprintf('Tenant review #%d', (int) $review->getKey()),
            operationRunId: $reviewPack->operation_run_id,
            tenant: $tenant,
        );
    }
}