<?php

declare(strict_types=1);

namespace App\Infrastructure\AI\Agent;

use App\Infrastructure\AI\OllamaClientInterface;
use App\Infrastructure\AI\PromptTemplateService;
use App\Infrastructure\Search\WebSearchInterface;

final class SpecsResearchAgent
{
    public function __construct(
        private readonly OllamaClientInterface $client,
        private readonly PromptTemplateService $prompts,
        private readonly WebSearchInterface $search,
        private readonly string $model,
    ) {
    }

    /**
     * @return array{specsText: string, correctedModelNumber: string}
     */
    public function research(string $modelName, string $articleTypeName, string $manufacturer = ''): array
    {
        $subject = trim(($manufacturer !== '' ? $manufacturer.' ' : '').$modelName);

        $searchResults = $this->search->search("{$subject} {$articleTypeName} specifications");

        $prompt = $this->prompts->render('specs_research', [
            'articleType' => $articleTypeName,
            'subject' => $subject,
            'searchResults' => $searchResults !== '' ? $searchResults : 'No web results available.',
        ]);

        $result = $this->client->generate($this->model, $prompt);

        if ('' === trim($result)) {
            throw new \RuntimeException("No specifications found for model: {$modelName}");
        }

        return $this->parseResponse($result);
    }

    /** @return array{specsText: string, correctedModelNumber: string} */
    private function parseResponse(string $raw): array
    {
        $correctedModelNumber = '';

        if (preg_match('/^CORRECTED_MODEL_NUMBER:\s*(\S+)/m', $raw, $matches)) {
            $correctedModelNumber = trim($matches[1]);
            // Strip the line from the specs text
            $raw = preg_replace('/^CORRECTED_MODEL_NUMBER:[^\n]*\n?/m', '', $raw) ?? $raw;
        }

        return [
            'specsText' => trim($raw),
            'correctedModelNumber' => $correctedModelNumber,
        ];
    }
}