<?php

include "./config.php";

$mysqlDriver = new mysqli_driver();
$mysqlDriver->report_mode = MYSQLI_REPORT_OFF;

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

if ($_SERVER["REQUEST_METHOD"] == "POST") {
  if (
    isset($_SERVER["CONTENT_TYPE"]) &&
    !preg_match('/^application\/json(?:$|;)/', $_SERVER["CONTENT_TYPE"])
  ) {
    header("Accept: application/json", true, 415);
    echo json_encode([
      "status" => 415,
      "message" => "Only JSON is supported.",
    ]);
    exit();
  }

  $jsonData = file_get_contents("php://input");
  $parsedJsonData = json_decode($jsonData, true);

  if (json_last_error() !== JSON_ERROR_NONE) {
    http_response_code(400);
    echo json_encode([
      "status" => 400,
      "message" => "JSON parse error.",
    ]);
    exit();
  }

  $isValid = true;
  if (
    !isset($parsedJsonData["version"]) ||
    !isset($parsedJsonData["runtime"]) ||
    !isset($parsedJsonData["runtimeVersion"]) ||
    !isset($parsedJsonData["mods"]) ||
    !is_string($parsedJsonData["version"]) ||
    !is_string($parsedJsonData["runtime"]) ||
    !is_string($parsedJsonData["runtimeVersion"]) ||
    !is_array($parsedJsonData["mods"])
  ) {
    $isValid = false;
  } elseif (!in_array($parsedJsonData["runtime"], ["Node.js", "Bun", "Deno"])) {
    $isValid = false;
  } else {
    foreach ($parsedJsonData["mods"] as $mod) {
      if (
        !isset($mod["version"]) ||
        !is_string($mod["name"]) ||
        !is_string($mod["version"])
      ) {
        $isValid = false;
        break;
      }
    }
  }

  if (!$isValid) {
    http_response_code(400);
    echo json_encode([
      "status" => 400,
      "message" => "Invalid data.",
    ]);
    exit();
  }

  $requestIP = $_SERVER["REMOTE_ADDR"];

  $dnsRecords = dns_get_record(DOMAIN, DNS_A + DNS_AAAA);

  if ($dnsRecords) {
    $ipAddresses = array_map(
      function ($record) {
        return isset($record["ip"]) ? $record["ip"] : $record["ipv6"];
      },
      array_filter($dnsRecords, function ($record) {
        return isset($record["ip"]) || isset($record["ipv6"]);
      })
    );

    if (in_array($requestIP, $ipAddresses)) {
      http_response_code(200);
      echo json_encode([
        "status" => 200,
        "message" => "The statistics are added successfully.",
      ]);
      exit();
    }
  }

  $connection = new mysqli(
    MYSQL_HOST,
    MYSQL_USERNAME,
    MYSQL_PASSWORD,
    MYSQL_DATABASE,
    MYSQL_PORT
  );

  if ($connection->connect_error) {
    error_log("There was an error while processing the request!");
    error_log("Error: " . $connection->connect_error);
    http_response_code(500);
    echo json_encode([
      "status" => 500,
      "message" => "An unexpected error occurred.",
    ]);
    exit();
  }

  $escapedRequestIP = $connection->real_escape_string($requestIP);
  $version = $connection->real_escape_string($parsedJsonData["version"]);
  $runtime = $connection->real_escape_string($parsedJsonData["runtime"]);
  $runtimeVersion = $connection->real_escape_string(
    $parsedJsonData["runtimeVersion"]
  );

  $query = "INSERT INTO entries (ip, time, version, runtime, runtime_version) VALUES ('$escapedRequestIP', NOW(), '$version', '$runtime', '$runtimeVersion')";
  if (!$connection->query($query)) {
    error_log("There was an error while processing the request!");
    error_log("Error: " . $connection->error);
    http_response_code(500);
    echo json_encode([
      "status" => 500,
      "message" => "An unexpected error occurred.",
    ]);
    $connection->close();
    exit();
  }

  $entryId = intval($connection->insert_id);
  $entriesToInsert = [];
  foreach ($parsedJsonData["mods"] as $mod) {
    $name = $connection->real_escape_string($mod["name"]);
    $modVersion = $connection->real_escape_string($mod["version"]);
    $entriesToInsert[] = "($entryId, '$name', '$modVersion')";
  }

  if (!empty($entriesToInsert)) {
    $query =
      "INSERT INTO entries_mods (entry_id, name, version) VALUES " .
      implode(", ", $entriesToInsert);
    if (!$connection->query($query)) {
      error_log("There was an error while processing the request!");
      error_log("Error: " . $connection->error);
      http_response_code(500);
      echo json_encode([
        "status" => 500,
        "message" => "An unexpected error occurred.",
      ]);
      $connection->close();
      exit();
    }
  }

  http_response_code(200);
  echo json_encode([
    "status" => 200,
    "message" => "The statistics are added successfully.",
  ]);
  $connection->close();
} else {
  header("Allow: POST", true, 405);
  echo json_encode([
    "status" => 405,
    "message" => "Invalid HTTP method.",
  ]);
}
?>