<?php
require_once 'db.php';

header('Content-Type: application/json');

if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    $data = json_decode(file_get_contents('php://input'), true);
    
    if (isset($data['endpoint'], $data['keys']['p256dh'], $data['keys']['auth'])) {
        $endpoint = $data['endpoint'];
        $p256dh = $data['keys']['p256dh'];
        $auth = $data['keys']['auth'];
        
        try {
            // Check if subscription already exists
            $stmt = $pdo->prepare("SELECT id FROM subscriptions WHERE endpoint = ?");
            $stmt->execute([$endpoint]);
            
            if (!$stmt->fetch()) {
                $stmt = $pdo->prepare("INSERT INTO subscriptions (endpoint, p256dh, auth) VALUES (?, ?, ?)");
                $stmt->execute([$endpoint, $p256dh, $auth]);
            }
            
            echo json_encode(['status' => 'success']);
        } catch (PDOException $e) {
            echo json_encode(['status' => 'error', 'message' => 'Database error']);
        }
    } else {
        echo json_encode(['status' => 'error', 'message' => 'Invalid subscription data']);
    }
} else {
    echo json_encode(['status' => 'error', 'message' => 'Invalid request method']);
}
?>