<?php

namespace App\Jobs;

use App\Models\BulkOperationRun;
use App\Models\InventorySyncRun;
use App\Models\Tenant;
use App\Notifications\RunStatusChangedNotification;
use App\Services\BulkOperationService;
use App\Services\Drift\DriftFindingGenerator;
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\Log;
use RuntimeException;
use Throwable;

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

    public function __construct(
        public int $tenantId,
        public int $userId,
        public int $baselineRunId,
        public int $currentRunId,
        public string $scopeKey,
        public int $bulkOperationRunId,
    ) {}

    /**
     * Execute the job.
     */
    public function handle(DriftFindingGenerator $generator, BulkOperationService $bulkOperationService): void
    {
        Log::info('GenerateDriftFindingsJob: started', [
            'tenant_id' => $this->tenantId,
            'baseline_run_id' => $this->baselineRunId,
            'current_run_id' => $this->currentRunId,
            'scope_key' => $this->scopeKey,
            'bulk_operation_run_id' => $this->bulkOperationRunId,
        ]);

        $tenant = Tenant::query()->find($this->tenantId);
        if (! $tenant instanceof Tenant) {
            throw new RuntimeException('Tenant not found.');
        }

        $baseline = InventorySyncRun::query()->find($this->baselineRunId);
        if (! $baseline instanceof InventorySyncRun) {
            throw new RuntimeException('Baseline run not found.');
        }

        $current = InventorySyncRun::query()->find($this->currentRunId);
        if (! $current instanceof InventorySyncRun) {
            throw new RuntimeException('Current run not found.');
        }

        $run = BulkOperationRun::query()
            ->where('tenant_id', $tenant->getKey())
            ->find($this->bulkOperationRunId);

        if (! $run instanceof BulkOperationRun) {
            throw new RuntimeException('Bulk operation run not found.');
        }

        $bulkOperationService->start($run);

        try {
            $created = $generator->generate(
                tenant: $tenant,
                baseline: $baseline,
                current: $current,
                scopeKey: $this->scopeKey,
            );

            Log::info('GenerateDriftFindingsJob: completed', [
                'tenant_id' => $this->tenantId,
                'baseline_run_id' => $this->baselineRunId,
                'current_run_id' => $this->currentRunId,
                'scope_key' => $this->scopeKey,
                'bulk_operation_run_id' => $this->bulkOperationRunId,
                'created_findings_count' => $created,
            ]);

            $bulkOperationService->recordSuccess($run);
            $bulkOperationService->complete($run);

            $this->notifyStatus($run->refresh());
        } catch (Throwable $e) {
            Log::error('GenerateDriftFindingsJob: failed', [
                'tenant_id' => $this->tenantId,
                'baseline_run_id' => $this->baselineRunId,
                'current_run_id' => $this->currentRunId,
                'scope_key' => $this->scopeKey,
                'bulk_operation_run_id' => $this->bulkOperationRunId,
                'error' => $e->getMessage(),
            ]);

            $bulkOperationService->recordFailure(
                run: $run,
                itemId: $this->scopeKey,
                reason: $e->getMessage(),
                reasonCode: 'unknown',
            );

            $bulkOperationService->fail($run, $e->getMessage());
            $this->notifyStatus($run->refresh());

            throw $e;
        }
    }

    private function notifyStatus(BulkOperationRun $run): void
    {
        try {
            if (! $run->relationLoaded('user')) {
                $run->loadMissing('user');
            }

            if (! $run->user) {
                return;
            }

            $status = 'failed';

            try {
                $status = $run->statusBucket();
            } catch (Throwable) {
                $failureEntries = $run->failures ?? [];
                $hasNonSkippedFailure = false;
                foreach ($failureEntries as $entry) {
                    if (! is_array($entry)) {
                        continue;
                    }

                    if (($entry['type'] ?? 'failed') !== 'skipped') {
                        $hasNonSkippedFailure = true;
                        break;
                    }
                }

                $failedCount = (int) ($run->failed ?? 0);
                $succeededCount = (int) ($run->succeeded ?? 0);
                $hasFailures = $failedCount > 0 || $hasNonSkippedFailure;

                if ($succeededCount > 0 && $hasFailures) {
                    $status = 'partially succeeded';
                } elseif ($succeededCount === 0 && $hasFailures) {
                    $status = 'failed';
                } else {
                    $status = match ($run->status) {
                        'pending' => 'queued',
                        'running' => 'running',
                        'completed', 'completed_with_errors' => 'succeeded',
                        default => 'failed',
                    };
                }
            }

            $run->user->notify(new RunStatusChangedNotification([
                'tenant_id' => (int) $run->tenant_id,
                'run_type' => 'bulk_operation',
                'run_id' => (int) $run->getKey(),
                'status' => $status,
                'counts' => [
                    'total' => (int) $run->total_items,
                    'processed' => (int) $run->processed_items,
                    'succeeded' => (int) $run->succeeded,
                    'failed' => (int) $run->failed,
                    'skipped' => (int) $run->skipped,
                ],
            ]));
        } catch (Throwable $e) {
            Log::warning('GenerateDriftFindingsJob: status notification failed', [
                'tenant_id' => (int) $run->tenant_id,
                'bulk_operation_run_id' => (int) $run->getKey(),
                'error' => $e->getMessage(),
            ]);
        }
    }
}