<?php

namespace App\Support\AiProviders;

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

/**
 * Text-to-speech via ElevenLabs. Used for narration/voiceover. Unlike the
 * other drivers, a successful response body IS the generated content
 * (raw audio bytes), not JSON.
 */
class ElevenLabsDriver implements AiProviderDriver
{
    public function generate(AiProvider $provider, string $prompt, array $options = []): AiGenerationResult
    {
        $voiceId = $options['voice_id'] ?? $provider->config['voice_id'] ?? null;

        if (! $voiceId) {
            throw new AiGenerationException("AI provider '{$provider->name}' has no voice_id configured for text-to-speech.");
        }

        $modelId = $options['model_id'] ?? $provider->config['model_id'] ?? 'eleven_multilingual_v2';

        try {
            $response = Http::withHeaders(['xi-api-key' => $provider->api_key])
                ->post("https://api.elevenlabs.io/v1/text-to-speech/{$voiceId}", [
                    'text' => $prompt,
                    'model_id' => $modelId,
                ]);
        } catch (ConnectionException $e) {
            throw new AiGenerationException("could not connect to ElevenLabs: {$e->getMessage()}");
        }

        if ($response->failed()) {
            $error = $response->json('detail.message') ?? $response->json('detail') ?? 'unexpected response from ElevenLabs';

            throw new AiGenerationException(is_string($error) ? $error : 'unexpected response from ElevenLabs');
        }

        return new AiGenerationResult($response->body(), 'audio/mpeg');
    }
}