// Copyright (c) 2012, 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.

library utf.utf16_test;

import 'package:test/test.dart';
import 'package:utf/utf.dart';

import 'expect.dart' as expect;

const String testKoreanCharSubset = """
가각갂갃간갅갆갇갈갉갊갋갌갍갎갏감갑값갓갔강갖갗갘같갚갛
개객갞갟갠갡갢갣갤갥갦갧갨갩갪갫갬갭갮갯갰갱갲갳갴갵갶갷
갸갹갺갻갼갽갾갿걀걁걂걃걄걅걆걇걈걉걊걋걌걍걎걏걐걑걒걓""";

const String testHanWater = "水";

const List<int> testKoreanCharSubsetUtf16beBom = <int>[
  0xfe, 0xff, 0xac, 0x00, 0xac, 0x01, 0xac, 0x02, // 8
  0xac, 0x03, 0xac, 0x04, 0xac, 0x05, 0xac, 0x06,
  0xac, 0x07, 0xac, 0x08, 0xac, 0x09, 0xac, 0x0a,
  0xac, 0x0b, 0xac, 0x0c, 0xac, 0x0d, 0xac, 0x0e,
  0xac, 0x0f, 0xac, 0x10, 0xac, 0x11, 0xac, 0x12,
  0xac, 0x13, 0xac, 0x14, 0xac, 0x15, 0xac, 0x16,
  0xac, 0x17, 0xac, 0x18, 0xac, 0x19, 0xac, 0x1a,
  0xac, 0x1b, 0x00, 0x0a, 0xac, 0x1c, 0xac, 0x1d,
  0xac, 0x1e, 0xac, 0x1f, 0xac, 0x20, 0xac, 0x21,
  0xac, 0x22, 0xac, 0x23, 0xac, 0x24, 0xac, 0x25,
  0xac, 0x26, 0xac, 0x27, 0xac, 0x28, 0xac, 0x29,
  0xac, 0x2a, 0xac, 0x2b, 0xac, 0x2c, 0xac, 0x2d,
  0xac, 0x2e, 0xac, 0x2f, 0xac, 0x30, 0xac, 0x31,
  0xac, 0x32, 0xac, 0x33, 0xac, 0x34, 0xac, 0x35,
  0xac, 0x36, 0xac, 0x37, 0x00, 0x0a, 0xac, 0x38,
  0xac, 0x39, 0xac, 0x3a, 0xac, 0x3b, 0xac, 0x3c,
  0xac, 0x3d, 0xac, 0x3e, 0xac, 0x3f, 0xac, 0x40,
  0xac, 0x41, 0xac, 0x42, 0xac, 0x43, 0xac, 0x44,
  0xac, 0x45, 0xac, 0x46, 0xac, 0x47, 0xac, 0x48,
  0xac, 0x49, 0xac, 0x4a, 0xac, 0x4b, 0xac, 0x4c,
  0xac, 0x4d, 0xac, 0x4e, 0xac, 0x4f, 0xac, 0x50,
  0xac, 0x51, 0xac, 0x52, 0xac, 0x53
];

const List<int> testKoreanCharSubsetUtf16le = <int>[
  0x00, 0xac, 0x01, 0xac, 0x02, 0xac, 0x03, 0xac, // 8
  0x04, 0xac, 0x05, 0xac, 0x06, 0xac, 0x07, 0xac,
  0x08, 0xac, 0x09, 0xac, 0x0a, 0xac, 0x0b, 0xac,
  0x0c, 0xac, 0x0d, 0xac, 0x0e, 0xac, 0x0f, 0xac,
  0x10, 0xac, 0x11, 0xac, 0x12, 0xac, 0x13, 0xac,
  0x14, 0xac, 0x15, 0xac, 0x16, 0xac, 0x17, 0xac,
  0x18, 0xac, 0x19, 0xac, 0x1a, 0xac, 0x1b, 0xac,
  0x0a, 0x00, 0x1c, 0xac, 0x1d, 0xac, 0x1e, 0xac,
  0x1f, 0xac, 0x20, 0xac, 0x21, 0xac, 0x22, 0xac,
  0x23, 0xac, 0x24, 0xac, 0x25, 0xac, 0x26, 0xac,
  0x27, 0xac, 0x28, 0xac, 0x29, 0xac, 0x2a, 0xac,
  0x2b, 0xac, 0x2c, 0xac, 0x2d, 0xac, 0x2e, 0xac,
  0x2f, 0xac, 0x30, 0xac, 0x31, 0xac, 0x32, 0xac,
  0x33, 0xac, 0x34, 0xac, 0x35, 0xac, 0x36, 0xac,
  0x37, 0xac, 0x0a, 0x00, 0x38, 0xac, 0x39, 0xac,
  0x3a, 0xac, 0x3b, 0xac, 0x3c, 0xac, 0x3d, 0xac,
  0x3e, 0xac, 0x3f, 0xac, 0x40, 0xac, 0x41, 0xac,
  0x42, 0xac, 0x43, 0xac, 0x44, 0xac, 0x45, 0xac,
  0x46, 0xac, 0x47, 0xac, 0x48, 0xac, 0x49, 0xac,
  0x4a, 0xac, 0x4b, 0xac, 0x4c, 0xac, 0x4d, 0xac,
  0x4e, 0xac, 0x4f, 0xac, 0x50, 0xac, 0x51, 0xac,
  0x52, 0xac, 0x53, 0xac
];

void main() {
  test('encode to utf16', testEncodeToUtf16);
  test('utf16 bytes to string', testUtf16BytesToString);
  test('iterable methods', testIterableMethods);
}

void testEncodeToUtf16() {
  expect.listEquals(
      [], encodeUtf16be("")); // TODO(dcarlson) should we skip bom if empty?
  expect.listEquals(testKoreanCharSubsetUtf16beBom,
      encodeUtf16(testKoreanCharSubset), "encode UTF-16(BE by default) Korean");

  expect.listEquals(testKoreanCharSubsetUtf16le,
      encodeUtf16le(testKoreanCharSubset), "encode UTF-16LE Korean");
}

void testUtf16BytesToString() {
  expect.stringEquals("", decodeUtf16([]));
  expect.stringEquals(
      testHanWater, decodeUtf16([0x6C, 0x34]), "Water variation 1");
  expect.stringEquals(
      testHanWater, decodeUtf16([0xFE, 0xFF, 0x6C, 0x34]), "Water variation 2");
  expect.stringEquals(
      testHanWater, decodeUtf16([0xFF, 0xFE, 0x34, 0x6C]), "Water variation 3");

  expect.stringEquals(
      testHanWater, decodeUtf16be([0x6C, 0x34]), "Water variation 4");
  expect.stringEquals(testHanWater, decodeUtf16be([0xFE, 0xFF, 0x6C, 0x34]),
      "Water variation 5");

  expect.stringEquals(
      testHanWater, decodeUtf16le([0x34, 0x6C]), "Water variation 6");
  expect.stringEquals(testHanWater, decodeUtf16le([0xFF, 0xFE, 0x34, 0x6C]),
      "Water variation 7");

  expect.stringEquals(testKoreanCharSubset,
      decodeUtf16(testKoreanCharSubsetUtf16beBom), "UTF-16BE Korean");
}

void testIterableMethods() {
  // empty input
  expect.isFalse(decodeUtf16AsIterable([]).iterator.moveNext());

  IterableUtf16Decoder koreanDecoder =
      decodeUtf16AsIterable(testKoreanCharSubsetUtf16beBom);
  // get the first character
  expect.equals(testKoreanCharSubset.codeUnits[0], koreanDecoder.first);
  // get the whole translation using the Iterable interface
  expect.stringEquals(testKoreanCharSubset,
      String.fromCharCodes(List<int>.from(koreanDecoder)));

  // specify types
  expect.equals(
      44032,
      (List<int>.from(
          decodeUtf16beAsIterable(testKoreanCharSubsetUtf16beBom)))[0]);
  expect.equals(
      44032,
      (List<int>.from(
          decodeUtf16leAsIterable(testKoreanCharSubsetUtf16le)))[0]);
  bool stripBom = false;
  expect.equals(
      UNICODE_BOM,
      (List<int>.from(decodeUtf16beAsIterable(
          testKoreanCharSubsetUtf16beBom, 0, null, stripBom)))[0]);
}