import 'dart:async';
import 'dart:ffi';
import 'dart:io';

import 'package:ffi/ffi.dart';
import 'package:flutter/services.dart';

typedef Argon2HashNative = Pointer<Utf8> Function(
  Pointer<Uint8> key,
  Uint32 keyLen,
  Pointer<Uint8> salt,
  Uint32 saltlen,
  Uint32 m_cost, // memory cost
  Uint32 t_cost, // time cost (number iterations)
  Uint32 parallelism,
  IntPtr hashlen,
  Uint8 type,
  Uint32 version,
);

typedef Argon2Hash = Pointer<Utf8> Function(
  Pointer<Uint8> key,
  int keyLen,
  Pointer<Uint8> salt,
  int saltlen,
  int m_cost, // memory cost
  int t_cost, // time cost (number iterations)
  int parallelism,
  int hashlen,
  int type,
  int version,
);

class Argon2Ffi {
  int Function(int x, int y) _nativeAdd;
  Argon2Hash argon2hash;

  Argon2Ffi() {
    final argon2lib = Platform.isAndroid
        ? DynamicLibrary.open('libargon2_ffi.so')
        : Platform.isLinux
            ? DynamicLibrary.open('libargon2_ffi_plugin.so')
            : DynamicLibrary.executable();
    _nativeAdd = argon2lib
        .lookup<NativeFunction<Int32 Function(Int32, Int32)>>('native_add')
        .asFunction();
    argon2hash = argon2lib
        .lookup<NativeFunction<Argon2HashNative>>('hp_argon2_hash')
        .asFunction();
  }

  int addIt(int x, int y) => _nativeAdd(x, y);
}