// ignore_for_file: non_constant_identifier_names, prefer_typing_uninitialized_variables, constant_identifier_names, no_leading_underscores_for_local_identifiers

import 'dart:convert' as cvt;
import 'dart:ffi' as ffi;
import 'dart:io';
import 'package:ffi/ffi.dart';
import 'common.dart';

class _Bindings
{
  static ffi.DynamicLibrary _load() {
    String _libName = "pocketpy";
    if (Platform.isIOS) {
      return ffi.DynamicLibrary.process();
    }
    if (Platform.isAndroid || Platform.isLinux) {
      return ffi.DynamicLibrary.open('lib$_libName.so');
    }
    if (Platform.isWindows) {
      return ffi.DynamicLibrary.open('$_libName.dll');
    }
    throw UnsupportedError('Unknown platform: ${Platform.operatingSystem}');
  }

  static final _lib = _load();

  static final pkpy_delete = _lib.lookupFunction<ffi.Void Function(ffi.Pointer p), void Function(ffi.Pointer p)>("pkpy_delete");
  static final pkpy_new_repl = _lib.lookupFunction<ffi.Pointer Function(ffi.Pointer vm), ffi.Pointer Function(ffi.Pointer vm)>("pkpy_new_repl");
  static final pkpy_repl_input = _lib.lookupFunction<ffi.Int32 Function(ffi.Pointer r, ffi.Pointer<Utf8> line), int Function(ffi.Pointer r, ffi.Pointer<Utf8> line)>("pkpy_repl_input");
  static final pkpy_new_vm = _lib.lookupFunction<ffi.Pointer Function(ffi.Bool use_stdio), ffi.Pointer Function(bool use_stdio)>("pkpy_new_vm");
  static final pkpy_vm_add_module = _lib.lookupFunction<ffi.Void Function(ffi.Pointer vm, ffi.Pointer<Utf8> name, ffi.Pointer<Utf8> source), void Function(ffi.Pointer vm, ffi.Pointer<Utf8> name, ffi.Pointer<Utf8> source)>("pkpy_vm_add_module");
  static final pkpy_vm_eval = _lib.lookupFunction<ffi.Pointer<Utf8> Function(ffi.Pointer vm, ffi.Pointer<Utf8> source), ffi.Pointer<Utf8> Function(ffi.Pointer vm, ffi.Pointer<Utf8> source)>("pkpy_vm_eval");
  static final pkpy_vm_exec = _lib.lookupFunction<ffi.Void Function(ffi.Pointer vm, ffi.Pointer<Utf8> source), void Function(ffi.Pointer vm, ffi.Pointer<Utf8> source)>("pkpy_vm_exec");
  static final pkpy_vm_get_global = _lib.lookupFunction<ffi.Pointer<Utf8> Function(ffi.Pointer vm, ffi.Pointer<Utf8> name), ffi.Pointer<Utf8> Function(ffi.Pointer vm, ffi.Pointer<Utf8> name)>("pkpy_vm_get_global");
  static final pkpy_vm_read_output = _lib.lookupFunction<ffi.Pointer<Utf8> Function(ffi.Pointer vm), ffi.Pointer<Utf8> Function(ffi.Pointer vm)>("pkpy_vm_read_output");
}


class REPL {
  late final ffi.Pointer pointer;

  REPL(VM vm) {
    pointer = _Bindings.pkpy_new_repl(vm.pointer);
  }

  void dispose() {
    _Bindings.pkpy_delete(pointer);
  }

  /// Input a source line to an interactive console.
  int input(String line)
  {
    var ret = _Bindings.pkpy_repl_input(pointer, _Str(line).p);
    return ret;
  }

}