<?php

declare(strict_types=1);

namespace App\Services\Recommendations\VectorSimilarity;

use Illuminate\Support\Facades\Log;

/**
 * Factory to resolve the configured VectorAdapterInterface implementation.
 */
final class VectorAdapterFactory
{
    /**
     * @return VectorAdapterInterface|null  null when vector similarity is disabled
     */
    public static function make(): ?VectorAdapterInterface
    {
        if (! (bool) config('recommendations.similarity.vector_enabled', false)) {
            return null;
        }

        $adapter = (string) config('recommendations.similarity.vector_adapter', 'pgvector');

        return match ($adapter) {
            'pgvector'  => new PgvectorAdapter(),
            'pinecone'  => new PineconeAdapter(),
            default     => self::fallback($adapter),
        };
    }

    private static function fallback(string $adapter): PgvectorAdapter
    {
        Log::warning("[VectorAdapterFactory] Unknown adapter '{$adapter}', falling back to pgvector.");
        return new PgvectorAdapter();
    }
}