<?php
header("Content-Type: application/json");

// Set default values.
$defaultPlaying = false;

// File path for the JSON status.
$file = __DIR__ . '/sketch-status.json';

// Attempt to load existing values from stack-status.json if it exists.
if (file_exists($file)) {
    $jsonContent = file_get_contents($file);
    $existingData = json_decode($jsonContent, true);
    if (is_array($existingData)) {
        if (isset($existingData['playing'])) {
            // Use FILTER_VALIDATE_BOOLEAN to convert to boolean.
            $defaultPlaying = filter_var($existingData['playing'], FILTER_VALIDATE_BOOLEAN);
        }
    }
}

// Retrieve query parameters.
$playing   = isset($_GET['playing']) ? $_GET['playing'] : null;

// Prepare the data array using defaults.
$data = [
    'playing'   => $defaultPlaying
];

if ($playing !== null) {
    $data['playing'] = (strtolower($playing) === 'true');
}

// Write the updated data to "stack-status.json".
if (file_put_contents($file, json_encode($data, JSON_PRETTY_PRINT)) === false) {
    http_response_code(500);
    echo json_encode(["error" => "Failed to write to file."]);
    exit;
}

// Output the JSON data.
echo json_encode($data, JSON_PRETTY_PRINT);
?>