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

// Set default values.
$defaultThreshold = 220;
$defaultRunning = false;

// File path for the JSON status.
$file = __DIR__ . '/stack-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['threshold']) && is_numeric($existingData['threshold'])) {
            $defaultThreshold = (float)$existingData['threshold'];
        }
        if (isset($existingData['running'])) {
            // Use FILTER_VALIDATE_BOOLEAN to convert to boolean.
            $defaultRunning = filter_var($existingData['running'], FILTER_VALIDATE_BOOLEAN);
        }
    }
}

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

// Prepare the data array using defaults.
$data = [
    'threshold' => $defaultThreshold,
    'running'   => $defaultRunning
];

// Override defaults if query parameters are provided.
if ($threshold !== null && is_numeric($threshold)) {
    $data['threshold'] = (float)$threshold;
}

if ($running !== null) {
    $data['running'] = (strtolower($running) === '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);
?>