<?php
// backend/api/ai_enhance.php
header("Content-Type: application/json");
header("Access-Control-Allow-Origin: *");
header("Access-Control-Allow-Methods: POST");

session_start();
if (!isset($_SESSION['user_id'])) {
    http_response_code(401);
    echo json_encode(["error" => "Unauthorized"]);
    exit;
}

$data = json_decode(file_get_contents("php://input"), true);
$section_type = $data['section_type'] ?? '';
$content = $data['content'] ?? '';

// AI enhancement API structure (ready for OpenAI/Claude integration)
// API endpoint structure for AI service
$ai_payload = [
    "model" => "gpt-3.5-turbo",
    "messages" => [
        [
            "role" => "system",
            "content" => "You are a professional resume writer. Enhance the following $section_type to be more impactful, ATS-friendly, and professional. Keep it truthful and concise."
        ],
        [
            "role" => "user",
            "content" => $content
        ]
    ],
    "temperature" => 0.7
];

// Uncomment when API key is configured
/*
$ch = curl_init("https://api.openai.com/v1/chat/completions");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, [
    "Content-Type: application/json",
    "Authorization: Bearer " . getenv('OPENAI_API_KEY')
]);
curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($ai_payload));
$response = curl_exec($ch);
$enhanced = json_decode($response, true)['choices'][0]['message']['content'];
*/

// Mock response for now
$enhanced = "[AI Enhanced] " . $content . " (Professional, results-driven version)";

echo json_encode([
    "success" => true,
    "original" => $content,
    "enhanced" => $enhanced
]);
?>