<?php
session_start();

require_once 'db/config.php';

if (!isset($_SESSION['user_id'])) {
    http_response_code(401); // Unauthorized
    exit('You must be logged in to log progress.');
}

$data = json_decode(file_get_contents('php://input'), true);
$theme = $data['theme'] ?? null;

if (empty($theme)) {
    http_response_code(400); // Bad Request
    exit('Theme is required.');
}

$user_id = $_SESSION['user_id'];
$completion_date = date('Y-m-d');

try {
    $pdo = db();
    $stmt = $pdo->prepare("INSERT INTO progress (user_id, theme, completion_date) VALUES (?, ?, ?)");
    $stmt->execute([$user_id, $theme, $completion_date]);
    
    http_response_code(200); // OK
    echo json_encode(['success' => true]);

} catch (PDOException $e) {
    http_response_code(500); // Internal Server Error
    error_log('Failed to log progress: ' . $e->getMessage());
    echo json_encode(['success' => false, 'message' => 'Could not save progress.']);
}