<?php
header('Content-type:application/json;charset=utf-8'); // Set the response content type to JSON

$target_dir = "./maps/";

/**
 * Generates a random map id
 */
function generateMapId()
{
  $mapId = "";
  $characters = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
  for ($i = 0; $i < 10; $i++) {
    $mapId .= $characters[rand(0, strlen($characters) - 1)];
  }
  return $mapId;
}

/**
 * Return a JSON response
 */
function returnJson($data): void
{
  echo (json_encode($data));
  die();
}


/**
 * Checks if the file is a zip file
 */
function isZipFile($file)
{
  $fileType = strtolower(pathinfo($file, PATHINFO_EXTENSION));
  return $fileType == "zip";
}

$mapId = generateMapId(); // the id of the map

$map = $_FILES["map"];
$file = $map["tmp_name"];

if (!isZipFile($file)) {
  echo "The file is not a zip file";
  return;
}

$target_file = $target_dir . $mapId . ".zip";
if (move_uploaded_file($file, $target_file)) {
  returnJson([
    "status" => "success",
    "mapId" => $mapId
  ]);
} else {
  returnJson([
    "status" => "error",
    "message" => "An error occurred while uploading the file"
  ]);
}