<?php
header('Content-Type: application/json');
require_once __DIR__ . '/../ai/LocalAIApi.php';

// Basic input validation
$requestBody = file_get_contents('php://input');
$data = json_decode($requestBody, true);
$genre = isset($data['genre']) ? trim($data['genre']) : '';
$topic = isset($data['topic']) ? trim($data['topic']) : '';

if (empty($genre) || empty($topic)) {
    http_response_code(400);
    echo json_encode(['error' => 'Genre and topic are required.']);
    exit;
}

// Prepare the prompt for the AI
$prompt = "You are a creative assistant for social media influencers. Generate a short video script (around 150-200 words) for the genre: '{$genre}'. The script should be about: '{$topic}'. The script should be engaging, concise, and suitable for platforms like TikTok, Instagram Reels, or YouTube Shorts. Include suggestions for visuals or on-screen text where appropriate. Format the output as plain text.";

try {
    $resp = LocalAIApi::createResponse(
        [
            'input' => [
                ['role' => 'system', 'content' => 'You are a helpful scriptwriting assistant for social media creators.'],
                ['role' => 'user', 'content' => $prompt],
            ],
        ],
        [
            'poll_interval' => 5,
            'poll_timeout'  => 300
        ]
    );

    if (!empty($resp['success'])) {
        $text = LocalAIApi::extractText($resp);
        if ($text === '') {
             throw new Exception('AI returned an empty response.');
        }
        echo json_encode(['script' => nl2br(htmlspecialchars($text))]);
    } else {
        throw new Exception($resp['error'] ?? 'Unknown AI API error.');
    }

} catch (Exception $e) {
    error_log('AI script generation error: ' . $e->getMessage());
    http_response_code(500);
    echo json_encode(['error' => 'Sorry, we couldn\'t generate a script at this time. Please try again later.']);
}