<?php

declare(strict_types=1);

namespace App\Jobs;

use App\Services\Recommendations\UserInterestProfileService;
use Carbon\CarbonImmutable;
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\DB;
use Illuminate\Support\Facades\Log;
use Illuminate\Support\Facades\Redis;
use Illuminate\Support\Facades\Schema;

final class IngestUserDiscoveryEventJob implements ShouldQueue
{
    use Dispatchable;
    use InteractsWithQueue;
    use Queueable;
    use SerializesModels;

    public int $tries = 3;

    /** @var array<int, int> */
    public array $backoff = [5, 30, 120];

    /**
     * @param array<string, mixed> $meta
     */
    public function __construct(
        public readonly string $eventId,
        public readonly int $userId,
        public readonly int $artworkId,
        public readonly string $eventType,
        public readonly string $algoVersion,
        public readonly string $occurredAt,
        public readonly array $meta = []
    ) {
    }

    public function handle(UserInterestProfileService $profileService): void
    {
        $idempotencyKey = sprintf('discovery:event:processed:%s', $this->eventId);

        try {
            $didSet = false;
            try {
                $didSet = (bool) Redis::setnx($idempotencyKey, 1);
                if ($didSet) {
                    Redis::expire($idempotencyKey, 86400 * 2);
                }
            } catch (\Throwable $e) {
                Log::warning('Redis unavailable for discovery ingestion; proceeding without redis dedupe', [
                    'event_id' => $this->eventId,
                    'error' => $e->getMessage(),
                ]);
                $didSet = true;
            }

            if (! $didSet) {
                return;
            }

            $occurredAt = CarbonImmutable::parse($this->occurredAt);
            $eventVersion = (string) config('discovery.event_version', 'event-v1');
            $eventWeight = (float) ((array) config('discovery.weights', []))[$this->eventType] ?? 1.0;

            $categoryId = DB::table('artwork_category')
                ->where('artwork_id', $this->artworkId)
                ->orderBy('category_id')
                ->value('category_id');

            $insertPayload = [
                'event_id' => $this->eventId,
                'user_id' => $this->userId,
                'artwork_id' => $this->artworkId,
                'category_id' => $categoryId !== null ? (int) $categoryId : null,
                'event_type' => $this->eventType,
                'event_version' => $eventVersion,
                'algo_version' => $this->algoVersion,
                'weight' => $eventWeight,
                'event_date' => $occurredAt->toDateString(),
                'occurred_at' => $occurredAt->toDateTimeString(),
                'created_at' => now(),
                'updated_at' => now(),
            ];

            if (Schema::hasColumn('user_discovery_events', 'meta')) {
                $insertPayload['meta'] = $this->meta;
            } elseif (Schema::hasColumn('user_discovery_events', 'metadata')) {
                $insertPayload['metadata'] = json_encode($this->meta, JSON_UNESCAPED_SLASHES);
            }

            DB::table('user_discovery_events')->insertOrIgnore($insertPayload);

            $profileService->applyEvent(
                userId: $this->userId,
                eventType: $this->eventType,
                artworkId: $this->artworkId,
                categoryId: $categoryId !== null ? (int) $categoryId : null,
                occurredAt: $occurredAt,
                eventId: $this->eventId,
                algoVersion: $this->algoVersion,
                eventMeta: $this->meta
            );
        } catch (\Throwable $e) {
            Log::error('IngestUserDiscoveryEventJob failed', [
                'event_id' => $this->eventId,
                'user_id' => $this->userId,
                'artwork_id' => $this->artworkId,
                'event_type' => $this->eventType,
                'error' => $e->getMessage(),
            ]);

            throw $e;
        }
    }
}