<?php

namespace App\Services;

use Illuminate\Support\Facades\Http;
use RuntimeException;

class OllamaService
{
    public function isConfigured(): bool
    {
        return (string) config('ollama.base_url') !== '';
    }

    /**
     * @param  array<int, array{role: string, content: string}>  $messages
     */
    public function chat(array $messages, ?string $model = null): string
    {
        $baseUrl = rtrim((string) config('ollama.base_url'), '/');
        if ($baseUrl === '') {
            throw new RuntimeException('OLLAMA_BASE_URL belum dikonfigurasi.');
        }

        $response = Http::timeout((int) config('ollama.timeout', 120))
            ->acceptJson()
            ->post($baseUrl.'/api/chat', [
                'model' => $model ?: (string) config('ollama.chat_model'),
                'messages' => $messages,
                'stream' => false,
            ]);

        if (! $response->successful()) {
            throw new RuntimeException('Ollama chat gagal: HTTP '.$response->status());
        }

        $content = data_get($response->json(), 'message.content');
        if (! is_string($content) || trim($content) === '') {
            throw new RuntimeException('Ollama mengembalikan respons kosong.');
        }

        return trim($content);
    }
}