<?php

namespace App\Jobs;

use App\Models\BackupItem;
use App\Models\OperationRun;
use App\Models\Tenant;
use App\Models\User;
use App\Services\AssignmentBackupService;
use App\Services\OperationRunService;
use App\Support\OperationRunOutcome;
use App\Support\OperationRunStatus;
use App\Support\OpsUx\AssignmentJobFingerprint;
use App\Support\OpsUx\RunFailureSanitizer;
use App\Support\Providers\ProviderReasonCodes;
use Illuminate\Bus\Queueable;
use Illuminate\Contracts\Queue\ShouldQueue;
use Illuminate\Foundation\Bus\Dispatchable;
use Illuminate\Queue\InteractsWithQueue;
use Illuminate\Queue\SerializesModels;
use Illuminate\Support\Facades\Cache;
use Illuminate\Support\Facades\Log;
use RuntimeException;

class FetchAssignmentsJob implements ShouldQueue
{
    use Dispatchable, InteractsWithQueue, Queueable, SerializesModels;

    private const string OPERATION_TYPE = 'assignments.fetch';

    private const int DEDUPE_COOLDOWN_MINUTES = 15;

    private const int EXECUTION_LOCK_TTL_SECONDS = 900;

    public ?OperationRun $operationRun = null;

    /**
     * The number of times the job may be attempted.
     */
    public int $tries = 1;

    /**
     * The number of seconds to wait before retrying the job.
     */
    public int $backoff = 0;

    /**
     * Create a new job instance.
     */
    public function __construct(
        public int $backupItemId,
        public string $tenantExternalId,
        public string $policyExternalId,
        public array $policyPayload,
        ?OperationRun $operationRun = null,
    ) {
        $this->operationRun = $operationRun;
    }

    public static function dispatchTracked(
        BackupItem $backupItem,
        array $policyPayload,
        ?User $initiator = null,
    ): OperationRun {
        $tenant = $backupItem->tenant;

        if (! $tenant instanceof Tenant) {
            throw new RuntimeException('BackupItem tenant context is required to dispatch assignment fetch job.');
        }

        /** @var OperationRunService $operationRunService */
        $operationRunService = app(OperationRunService::class);

        $identityInputs = self::operationRunIdentityInputs(
            tenantId: (int) $tenant->getKey(),
            backupItemId: (int) $backupItem->getKey(),
            tenantExternalId: (string) ($tenant->external_id ?? ''),
            policyExternalId: (string) $backupItem->policy_identifier,
        );

        $run = $operationRunService->ensureRunWithIdentityCooldown(
            tenant: $tenant,
            type: self::OPERATION_TYPE,
            identityInputs: $identityInputs,
            context: self::operationRunContext($backupItem),
            cooldownMinutes: self::DEDUPE_COOLDOWN_MINUTES,
            initiator: $initiator,
        );

        if ($run->wasRecentlyCreated) {
            dispatch(new self(
                backupItemId: (int) $backupItem->getKey(),
                tenantExternalId: (string) ($tenant->external_id ?? ''),
                policyExternalId: (string) $backupItem->policy_identifier,
                policyPayload: $policyPayload,
                operationRun: $run,
            ));
        }

        return $run;
    }

    /**
     * Execute the job.
     */
    public function handle(
        AssignmentBackupService $assignmentBackupService,
        OperationRunService $operationRunService,
    ): void {
        $backupItem = BackupItem::query()
            ->with('tenant')
            ->find($this->backupItemId);

        if (! $backupItem instanceof BackupItem) {
            Log::warning('FetchAssignmentsJob: BackupItem not found', [
                'backup_item_id' => $this->backupItemId,
            ]);

            return;
        }

        $tenant = $backupItem->tenant;

        if (! $tenant instanceof Tenant) {
            Log::warning('FetchAssignmentsJob: Tenant not found for BackupItem', [
                'backup_item_id' => $this->backupItemId,
            ]);

            return;
        }

        $fingerprint = AssignmentJobFingerprint::forFetch(
            backupItemId: (int) $backupItem->getKey(),
            tenantExternalId: $this->tenantExternalId,
            policyExternalId: $this->policyExternalId,
        );

        $identityInputs = self::operationRunIdentityInputs(
            tenantId: (int) $tenant->getKey(),
            backupItemId: (int) $backupItem->getKey(),
            tenantExternalId: $this->tenantExternalId,
            policyExternalId: $this->policyExternalId,
        );

        if (! $this->operationRun instanceof OperationRun) {
            $this->operationRun = $operationRunService->ensureRunWithIdentityCooldown(
                tenant: $tenant,
                type: self::OPERATION_TYPE,
                identityInputs: $identityInputs,
                context: self::operationRunContext($backupItem),
                cooldownMinutes: self::DEDUPE_COOLDOWN_MINUTES,
            );
        }

        $canonicalRun = $operationRunService->findCanonicalRunWithIdentity(
            tenant: $tenant,
            type: self::OPERATION_TYPE,
            identityInputs: $identityInputs,
            cooldownMinutes: self::DEDUPE_COOLDOWN_MINUTES,
        );

        if ($canonicalRun instanceof OperationRun && $canonicalRun->status === OperationRunStatus::Completed->value) {
            Log::info('FetchAssignmentsJob: Skipping because identity is in cooldown window', [
                'backup_item_id' => (int) $backupItem->getKey(),
                'operation_run_id' => (int) $canonicalRun->getKey(),
            ]);

            return;
        }

        if ($canonicalRun instanceof OperationRun
            && $this->operationRun instanceof OperationRun
            && (int) $canonicalRun->getKey() !== (int) $this->operationRun->getKey()
        ) {
            Log::info('FetchAssignmentsJob: Skipping non-canonical execution', [
                'backup_item_id' => (int) $backupItem->getKey(),
                'canonical_run_id' => (int) $canonicalRun->getKey(),
                'job_run_id' => (int) $this->operationRun->getKey(),
            ]);

            return;
        }

        $run = $this->operationRun instanceof OperationRun ? $this->operationRun : $canonicalRun;

        if (! $run instanceof OperationRun) {
            return;
        }

        $executionIdentityKey = AssignmentJobFingerprint::executionIdentityKey(
            jobType: self::OPERATION_TYPE,
            tenantId: (int) $tenant->getKey(),
            fingerprint: $fingerprint,
            operationRunId: (int) $run->getKey(),
        );

        $lock = Cache::lock('assignment-job:'.$executionIdentityKey, self::EXECUTION_LOCK_TTL_SECONDS);

        if (! $lock->get()) {
            Log::info('FetchAssignmentsJob: Overlap prevented for duplicate execution', [
                'backup_item_id' => (int) $backupItem->getKey(),
                'operation_run_id' => (int) $run->getKey(),
                'execution_identity' => $executionIdentityKey,
            ]);

            return;
        }

        try {
            if ($run->status !== OperationRunStatus::Completed->value) {
                $operationRunService->updateRun($run, OperationRunStatus::Running->value);
            }

            if ($backupItem->policy_type !== 'settingsCatalogPolicy') {
                Log::info('FetchAssignmentsJob: Skipping non-Settings Catalog policy', [
                    'backup_item_id' => (int) $backupItem->getKey(),
                    'policy_type' => (string) $backupItem->policy_type,
                ]);

                $this->completeRun(
                    operationRunService: $operationRunService,
                    run: $run,
                    fetchFailed: false,
                );

                return;
            }

            $assignmentBackupService->enrichWithAssignments(
                backupItem: $backupItem,
                tenant: $tenant,
                policyType: (string) $backupItem->policy_type,
                policyId: (string) $backupItem->policy_identifier,
                policyPayload: $this->policyPayload,
                includeAssignments: true,
            );

            $backupItem->refresh();
            $metadata = is_array($backupItem->metadata) ? $backupItem->metadata : [];

            $fetchFailed = (bool) ($metadata['assignments_fetch_failed'] ?? false);
            $reasonCandidate = $metadata['assignments_fetch_error_code']
                ?? $metadata['assignments_fetch_error']
                ?? ProviderReasonCodes::UnknownError;

            $reasonCode = RunFailureSanitizer::normalizeReasonCode(
                $this->normalizeReasonCandidate($reasonCandidate),
            );

            $this->completeRun(
                operationRunService: $operationRunService,
                run: $run,
                fetchFailed: $fetchFailed,
                failures: $fetchFailed
                    ? [[
                        'code' => 'assignments.fetch_failed',
                        'reason_code' => $reasonCode,
                        'message' => (string) ($metadata['assignments_fetch_error'] ?? 'Assignments fetch failed.'),
                    ]]
                    : [],
            );

            Log::info('FetchAssignmentsJob: Successfully processed', [
                'backup_item_id' => (int) $backupItem->getKey(),
                'operation_run_id' => (int) $run->getKey(),
                'assignment_count' => $backupItem->getAssignmentCountAttribute(),
                'fetch_failed' => $fetchFailed,
            ]);
        } catch (\Throwable $throwable) {
            Log::error('FetchAssignmentsJob: Failed to enrich BackupItem', [
                'backup_item_id' => (int) $backupItem->getKey(),
                'operation_run_id' => (int) $run->getKey(),
                'error' => $throwable->getMessage(),
            ]);

            $safeMessage = RunFailureSanitizer::sanitizeMessage($throwable->getMessage());

            $operationRunService->updateRun(
                $run,
                status: OperationRunStatus::Completed->value,
                outcome: OperationRunOutcome::Failed->value,
                summaryCounts: [
                    'total' => 1,
                    'processed' => 0,
                    'failed' => 1,
                ],
                failures: [[
                    'code' => 'assignments.fetch_failed',
                    'reason_code' => RunFailureSanitizer::normalizeReasonCode($throwable->getMessage()),
                    'message' => $safeMessage !== '' ? $safeMessage : 'Assignments fetch failed.',
                ]],
            );
        } finally {
            $lock->release();
        }
    }

    /**
     * @return array<string, int|string>
     */
    private static function operationRunIdentityInputs(
        int $tenantId,
        int $backupItemId,
        string $tenantExternalId,
        string $policyExternalId,
    ): array {
        return [
            'tenant_id' => $tenantId,
            'job_type' => self::OPERATION_TYPE,
            'fingerprint' => AssignmentJobFingerprint::forFetch(
                backupItemId: $backupItemId,
                tenantExternalId: $tenantExternalId,
                policyExternalId: $policyExternalId,
            ),
        ];
    }

    /**
     * @return array<string, int|string|null>
     */
    private static function operationRunContext(BackupItem $backupItem): array
    {
        return [
            'backup_set_id' => is_numeric($backupItem->backup_set_id) ? (int) $backupItem->backup_set_id : null,
            'backup_item_id' => (int) $backupItem->getKey(),
            'policy_id' => is_numeric($backupItem->policy_id) ? (int) $backupItem->policy_id : null,
            'policy_identifier' => (string) $backupItem->policy_identifier,
        ];
    }

    /**
     * @param  array<int, array{code:string, reason_code:string, message:string}>  $failures
     */
    private function completeRun(
        OperationRunService $operationRunService,
        OperationRun $run,
        bool $fetchFailed,
        array $failures = [],
    ): void {
        $operationRunService->updateRun(
            $run,
            status: OperationRunStatus::Completed->value,
            outcome: $fetchFailed ? OperationRunOutcome::Failed->value : OperationRunOutcome::Succeeded->value,
            summaryCounts: [
                'total' => 1,
                'processed' => $fetchFailed ? 0 : 1,
                'failed' => $fetchFailed ? 1 : 0,
            ],
            failures: $failures,
        );
    }

    private function normalizeReasonCandidate(mixed $reasonCandidate): string
    {
        if (is_string($reasonCandidate) && trim($reasonCandidate) !== '') {
            return trim($reasonCandidate);
        }

        return ProviderReasonCodes::UnknownError;
    }
}