<?php

namespace App\Services;

use App\Exceptions\OllamaUnavailableException;
use App\Models\EmbeddingCache;
use Illuminate\Support\Facades\Http;
use Throwable;

class EmbeddingService
{
    public function embed(string $text): array
    {
        $hash = hash('sha256', $text);
        $cached = EmbeddingCache::query()->where('text_hash', $hash)->first();

        if ($cached !== null) {
            return $cached->embedding;
        }

        $baseUrl = rtrim((string) config('services.ollama.base_url'), '/');

        try {
            $response = Http::timeout((int) config('services.ollama.timeout', 30))
                ->post($baseUrl.'/api/embeddings', [
                    'model' => config('services.ollama.embed_model', 'nomic-embed-text'),
                    'prompt' => $text,
                ])
                ->throw()
                ->json();
        } catch (Throwable $e) {
            throw new OllamaUnavailableException('Ollama embedding endpoint is unavailable', 0, $e);
        }

        $embedding = $response['embedding'] ?? [];
        if (!is_array($embedding) || $embedding === []) {
            throw new OllamaUnavailableException('Ollama embedding response did not include a valid embedding');
        }

        EmbeddingCache::query()->updateOrCreate(
            ['text_hash' => $hash],
            ['text' => $text, 'embedding' => $embedding]
        );

        return $embedding;
    }
}