<?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 < 4; $i++) {
    $mapId .= $characters[rand(0, strlen($characters) - 1)];
  }
  return $mapId;
}

/**
 * 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"]; // the file to upload

if (!isset($map)) { // if the file is not set
  echo "No file was uploaded";
  die();
}

$file = $map["tmp_name"]; // the temporary file path
$size = $map["size"]; // the size of the file

if ($size > 100000000) { // if the file is larger than 100MB
  echo "The file is too large";
  die();
}

if (!isZipFile($map["name"])) {
  echo "The file is not a zip file";
  die();
}

$fileHash = hash_file("sha256", $file); // the hash of the file

$exists = false;
foreach (scandir($target_dir) as $file) { // scan the maps directory for a file with the same hash
  if ($file == "." || $file == "..") { // ignore the . and .. files
    continue;
  }
  if (hash_file("sha256", $target_dir . $file) == $fileHash) {
    $mapId = pathinfo($file, PATHINFO_FILENAME);
    $exists = true;
    break;
  }
}

if ($exists) { // if the file already exists, redirect to the existing file
  header("Location: /?map=https://wip.fascinated.cc/maps/" . $mapId . ".zip");
  die();
}

$target_file = $target_dir . $mapId . ".zip";
if (!move_uploaded_file($file, $target_file)) {
  echo "There was an error uploading the file";
  die();
}

// redirect to /?map=https://wip.fascinated.cc/maps/" . $mapId . ".zip
header("Location: /?map=https://wip.fascinated.cc/maps/" . $mapId . ".zip");