<?php

namespace App\Support\AiProviders;

use App\Models\AiProvider;
use Illuminate\Http\Client\ConnectionException;
use Illuminate\Support\Facades\Http;

/**
 * Text generation via OpenAI's Chat Completions API. Used for scripts,
 * metadata (titles/descriptions/tags), and similar text content.
 */
class OpenAiDriver implements AiProviderDriver
{
    public function generate(AiProvider $provider, string $prompt, array $options = []): AiGenerationResult
    {
        $model = $options['model'] ?? $provider->config['model'] ?? 'gpt-4o-mini';

        $body = [
            'model' => $model,
            'messages' => [
                ['role' => 'user', 'content' => $prompt],
            ],
        ];

        // Ask the API to guarantee valid JSON back, for callers that need
        // structured output (e.g. a storyboard's scene breakdown). The
        // prompt itself must still ask for JSON — this only enforces it.
        if ($options['json_mode'] ?? false) {
            $body['response_format'] = ['type' => 'json_object'];
        }

        try {
            $response = Http::withToken($provider->api_key)
                ->post('https://api.openai.com/v1/chat/completions', $body);
        } catch (ConnectionException $e) {
            throw new AiGenerationException("could not connect to OpenAI: {$e->getMessage()}");
        }

        if ($response->failed()) {
            throw new AiGenerationException($response->json('error.message') ?? 'unexpected response from OpenAI');
        }

        $content = $response->json('choices.0.message.content');

        if (! $content) {
            throw new AiGenerationException('unexpected response from OpenAI: missing message content');
        }

        return new AiGenerationResult($content, 'text/plain', $response->json());
    }
}