<?php

declare(strict_types=1);

namespace App\Services;

use Exception;

class DAIClient
{
	private string $apiUrl;
	private int $timeout = 600;

	public function __construct(?string $apiUrl = null)
	{
		if ($apiUrl !== null) {
			$this->apiUrl = $apiUrl;
		} else {
			$this->apiUrl = \App\Utils\Config::get('DAIAPI_URL', 'http://192.168.122.10:9001/run');
		}
	}

	/**
	 * Sends a prompt to the DAIAPI and returns the raw answer string.
	 */
	public function sendRequest(string $prompt): ?string
	{
		$payload = json_encode([
			'prompt' => $prompt
		]);

		if ($payload === false) {
			error_log("DAIClient Error: Failed to encode JSON payload.");
			return null;
		}

		$ch = curl_init($this->apiUrl);
		curl_setopt_array($ch, [
			CURLOPT_RETURNTRANSFER => true,
			CURLOPT_POST => true,
			CURLOPT_HTTPHEADER => [
				'Content-Type: application/json',
				'Content-Length: ' . strlen($payload)
			],
			CURLOPT_POSTFIELDS => $payload,
			CURLOPT_TIMEOUT => $this->timeout,
		]);

		$response = curl_exec($ch);
		$error = curl_error($ch);
		$httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
		curl_close($ch);

		if ($response === false) {
			error_log("DAIClient Error: cURL error: $error");
			return null;
		}

		if ($httpCode !== 200) {
			error_log("DAIClient Error: API returned HTTP code $httpCode. Response: $response");
			return null;
		}

		$data = json_decode($response, true);
		if (!is_array($data) || empty($data['success']) || !isset($data['answer'])) {
			error_log("DAIClient Error: Invalid API response format: " . $response);
			return null;
		}

		return $data['answer'];
	}
}