// Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

// Variant of hello_world_test that uses the default WASI imports.

import "package:async_helper/async_helper.dart";
import "package:expect/expect.dart";
import "package:wasm/wasm.dart";
import "dart:convert";
import "dart:typed_data";

void main() async {
  asyncStart();

  // Hello world module generated by emscripten+WASI. Exports a function like
  // `void _start()`, and prints using `int fd_write(int, int, int, int)`.
  var data = Uint8List.fromList([
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    0x03, 0x7f, 0x7f, 0x7f, 0x01, 0x7f, 0x60, 0x04, 0x7f, 0x7f, 0x7f, 0x7f,
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    0x0b, 0x4d, 0x06, 0x00, 0x41, 0x80, 0x08, 0x0b, 0x12, 0x68, 0x65, 0x6c,
    0x6c, 0x6f, 0x2c, 0x20, 0x77, 0x6f, 0x72, 0x6c, 0x64, 0x21, 0x00, 0x00,
    0x00, 0x18, 0x04, 0x00, 0x41, 0x98, 0x08, 0x0b, 0x01, 0x05, 0x00, 0x41,
    0xa4, 0x08, 0x0b, 0x01, 0x01, 0x00, 0x41, 0xbc, 0x08, 0x0b, 0x0e, 0x02,
    0x00, 0x00, 0x00, 0x03, 0x00, 0x00, 0x00, 0xb8, 0x04, 0x00, 0x00, 0x00,
    0x04, 0x00, 0x41, 0xd4, 0x08, 0x0b, 0x01, 0x01, 0x00, 0x41, 0xe3, 0x08,
    0x0b, 0x05, 0x0a, 0xff, 0xff, 0xff, 0xff,
  ]);

  var inst =
      WasmModule(data).instantiate().enableWasi(captureStdout: true).build();

  var fn = inst.lookupFunction("_start");
  fn();
  var out = utf8.decode(await inst.stdout.first);
  Expect.equals("hello, world!\n", out);
  asyncEnd();
}