// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "ui/gfx/text_utils.h"

#include <stddef.h>

#include "base/stl_util.h"
#include "base/strings/utf_string_conversions.h"
#include "build/build_config.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "ui/gfx/font_list.h"

namespace gfx {
namespace {

const base::char16 kAcceleratorChar = '&';

struct RemoveAcceleratorCharData {
  const char* input;
  int accelerated_char_pos;
  int accelerated_char_span;
  const char* output;
  const char* name;
};

TEST(TextUtilsTest, GetStringWidth) {
  FontList font_list;
  EXPECT_EQ(GetStringWidth(base::string16(), font_list), 0);
  EXPECT_GT(GetStringWidth(base::ASCIIToUTF16("a"), font_list),
            GetStringWidth(base::string16(), font_list));
  EXPECT_GT(GetStringWidth(base::ASCIIToUTF16("ab"), font_list),
            GetStringWidth(base::ASCIIToUTF16("a"), font_list));
  EXPECT_GT(GetStringWidth(base::ASCIIToUTF16("abc"), font_list),
            GetStringWidth(base::ASCIIToUTF16("ab"), font_list));
}

class RemoveAcceleratorCharTest
    : public testing::TestWithParam<RemoveAcceleratorCharData> {
 public:
  static const RemoveAcceleratorCharData kCases[];
};

const RemoveAcceleratorCharData RemoveAcceleratorCharTest::kCases[] = {
    {"", -1, 0, "", "EmptyString"},
    {"&", -1, 0, "", "AcceleratorCharOnly"},
    {"no accelerator", -1, 0, "no accelerator", "NoAccelerator"},
    {"&one accelerator", 0, 1, "one accelerator", "OneAccelerator_Start"},
    {"one &accelerator", 4, 1, "one accelerator", "OneAccelerator_Middle"},
    {"one_accelerator&", -1, 0, "one_accelerator", "OneAccelerator_End"},
    {"&two &accelerators", 4, 1, "two accelerators",
     "TwoAccelerators_OneAtStart"},
    {"two &accelerators&", 4, 1, "two accelerators",
     "TwoAccelerators_OneAtEnd"},
    {"two& &accelerators", 4, 1, "two accelerators",
     "TwoAccelerators_SpaceBetween"},
    {"&&escaping", -1, 0, "&escaping", "Escape_Start"},
    {"escap&&ing", -1, 0, "escap&ing", "Escape_Middle"},
    {"escaping&&", -1, 0, "escaping&", "Escape_End"},
    {"&mix&&ed", 0, 1, "mix&ed", "Mixed_EscapeAfterAccelerator"},
    {"&&m&ix&&e&d&", 6, 1, "&mix&ed", "Mixed_MiddleAcceleratorSkipped"},
    {"&&m&&ix&ed&&", 5, 1, "&m&ixed&", "Mixed_OneAccelerator"},
    {"&m&&ix&ed&&", 4, 1, "m&ixed&", "Mixed_InitialAcceleratorSkipped"},
    // U+1D49C MATHEMATICAL SCRIPT CAPITAL A, which occupies two |char16|'s.
    {"&\U0001D49C", 0, 2, "\U0001D49C", "MultibyteAccelerator_Start"},
    {"Test&\U0001D49Cing", 4, 2, "Test\U0001D49Cing",
     "MultibyteAccelerator_Middle"},
    {"Test\U0001D49C&ing", 6, 1, "Test\U0001D49Cing",
     "OneAccelerator_AfterMultibyte"},
    {"Test&\U0001D49C&ing", 6, 1, "Test\U0001D49Cing",
     "MultibyteAccelerator_Skipped"},
    {"Test&\U0001D49C&&ing", 4, 2, "Test\U0001D49C&ing",
     "MultibyteAccelerator_EscapeAfter"},
    {"Test&\U0001D49C&\U0001D49Cing", 6, 2, "Test\U0001D49C\U0001D49Cing",
     "MultibyteAccelerator_AfterMultibyteAccelerator"},
};

INSTANTIATE_TEST_CASE_P(
    ,
    RemoveAcceleratorCharTest,
    testing::ValuesIn(RemoveAcceleratorCharTest::kCases),
    [](const testing::TestParamInfo<RemoveAcceleratorCharData>& param_info) {
      return param_info.param.name;
    });

TEST_P(RemoveAcceleratorCharTest, RemoveAcceleratorChar) {
  RemoveAcceleratorCharData data = GetParam();
  int accelerated_char_pos;
  int accelerated_char_span;
  base::string16 result =
      RemoveAcceleratorChar(base::UTF8ToUTF16(data.input), kAcceleratorChar,
                            &accelerated_char_pos, &accelerated_char_span);
  EXPECT_EQ(result, base::UTF8ToUTF16(data.output));
  EXPECT_EQ(accelerated_char_pos, data.accelerated_char_pos);
  EXPECT_EQ(accelerated_char_span, data.accelerated_char_span);
}

struct FindValidBoundaryData {
  const char16_t* input;
  size_t index_in;
  bool trim_whitespace;
  size_t index_out;
  const char* name;
};

class FindValidBoundaryBeforeTest
    : public testing::TestWithParam<FindValidBoundaryData> {
 public:
  static const FindValidBoundaryData kCases[];
};

const FindValidBoundaryData FindValidBoundaryBeforeTest::kCases[] = {
    {u"", 0, false, 0, "Empty"},
    {u"word", 0, false, 0, "StartOfString"},
    {u"word", 4, false, 4, "EndOfString"},
    {u"word", 2, false, 2, "MiddleOfString_OnValidCharacter"},
    {u"w𐐷d", 2, false, 1, "MiddleOfString_OnSurrogatePair"},
    {u"w𐐷d", 1, false, 1, "MiddleOfString_BeforeSurrogatePair"},
    {u"w𐐷d", 3, false, 3, "MiddleOfString_AfterSurrogatePair"},
    {u"wo d", 3, false, 3, "MiddleOfString_OnSpace_NoTrim"},
    {u"wo d", 3, true, 2, "MiddleOfString_OnSpace_Trim"},
    {u"wo d", 2, false, 2, "MiddleOfString_LeftOfSpace_NoTrim"},
    {u"wo d", 2, true, 2, "MiddleOfString_LeftOfSpace_Trim"},
    {u"wo\td", 3, false, 3, "MiddleOfString_OnTab_NoTrim"},
    {u"wo\td", 3, true, 2, "MiddleOfString_OnTab_Trim"},
    {u"w  d", 3, false, 3, "MiddleOfString_MultipleWhitespace_NoTrim"},
    {u"w  d", 3, true, 1, "MiddleOfString_MultipleWhitespace_Trim"},
    {u"w  d", 2, false, 2, "MiddleOfString_MiddleOfWhitespace_NoTrim"},
    {u"w  d", 2, true, 1, "MiddleOfString_MiddleOfWhitespace_Trim"},
    {u"w  ", 3, false, 3, "EndOfString_Whitespace_NoTrim"},
    {u"w  ", 3, true, 1, "EndOfString_Whitespace_Trim"},
    {u"  d", 2, false, 2, "MiddleOfString_Whitespace_NoTrim"},
    {u"  d", 2, true, 0, "MiddleOfString_Whitespace_Trim"},
    // COMBINING GRAVE ACCENT (U+0300)
    {u"wo\u0300d", 2, false, 1, "MiddleOfString_OnCombiningMark"},
    {u"wo\u0300d", 1, false, 1, "MiddleOfString_BeforeCombiningMark"},
    {u"wo\u0300d", 3, false, 3, "MiddleOfString_AfterCombiningMark"},
    {u"w o\u0300d", 3, true, 1, "MiddleOfString_SpaceAndCombinginMark_Trim"},
    {u"wo\u0300 d", 3, true, 3, "MiddleOfString_CombiningMarkAndSpace_Trim"},
    {u"w \u0300d", 3, true, 3,
     "MiddleOfString_AfterSpaceWithCombiningMark_Trim"},
    {u"w \u0300d", 2, true, 1, "MiddleOfString_OnSpaceWithCombiningMark_Trim"},
    {u"w \u0300 d", 4, true, 3,
     "MiddleOfString_AfterSpaceAfterSpaceWithCombiningMark_Trim"},
    // MUSICAL SYMBOL G CLEF (U+1D11E) + MUSICAL SYMBOL COMBINING FLAG-1
    // (U+1D16E)
    {u"w\U0001D11E\U0001D16Ed", 1, false, 1,
     "MiddleOfString_BeforeCombiningSurrogate"},
    {u"w\U0001D11E\U0001D16Ed", 2, false, 1,
     "MiddleOfString_OnCombiningSurrogate_Pos1"},
    {u"w\U0001D11E\U0001D16Ed", 3, false, 1,
     "MiddleOfString_OnCombiningSurrogate_Pos2"},
    {u"w\U0001D11E\U0001D16Ed", 4, false, 1,
     "MiddleOfString_OnCombiningSurrogate_Pos3"},
    {u"w\U0001D11E\U0001D16Ed", 5, false, 5,
     "MiddleOfString_AfterCombiningSurrogate"},
};

INSTANTIATE_TEST_CASE_P(
    ,
    FindValidBoundaryBeforeTest,
    testing::ValuesIn(FindValidBoundaryBeforeTest::kCases),
    [](const testing::TestParamInfo<FindValidBoundaryData>& param_info) {
      return param_info.param.name;
    });

TEST_P(FindValidBoundaryBeforeTest, FindValidBoundaryBefore) {
  FindValidBoundaryData data = GetParam();
  const base::string16::const_pointer input =
      reinterpret_cast<base::string16::const_pointer>(data.input);
  DLOG(INFO) << input;
  size_t result =
      FindValidBoundaryBefore(input, data.index_in, data.trim_whitespace);
  EXPECT_EQ(data.index_out, result);
}

class FindValidBoundaryAfterTest
    : public testing::TestWithParam<FindValidBoundaryData> {
 public:
  static const FindValidBoundaryData kCases[];
};

const FindValidBoundaryData FindValidBoundaryAfterTest::kCases[] = {
    {u"", 0, false, 0, "Empty"},
    {u"word", 0, false, 0, "StartOfString"},
    {u"word", 4, false, 4, "EndOfString"},
    {u"word", 2, false, 2, "MiddleOfString_OnValidCharacter"},
    {u"w𐐷d", 2, false, 3, "MiddleOfString_OnSurrogatePair"},
    {u"w𐐷d", 1, false, 1, "MiddleOfString_BeforeSurrogatePair"},
    {u"w𐐷d", 3, false, 3, "MiddleOfString_AfterSurrogatePair"},
    {u"wo d", 2, false, 2, "MiddleOfString_OnSpace_NoTrim"},
    {u"wo d", 2, true, 3, "MiddleOfString_OnSpace_Trim"},
    {u"wo d", 3, false, 3, "MiddleOfString_RightOfSpace_NoTrim"},
    {u"wo d", 3, true, 3, "MiddleOfString_RightOfSpace_Trim"},
    {u"wo\td", 2, false, 2, "MiddleOfString_OnTab_NoTrim"},
    {u"wo\td", 2, true, 3, "MiddleOfString_OnTab_Trim"},
    {u"w  d", 1, false, 1, "MiddleOfString_MultipleWhitespace_NoTrim"},
    {u"w  d", 1, true, 3, "MiddleOfString_MultipleWhitespace_Trim"},
    {u"w  d", 2, false, 2, "MiddleOfString_MiddleOfWhitespace_NoTrim"},
    {u"w  d", 2, true, 3, "MiddleOfString_MiddleOfWhitespace_Trim"},
    {u"w  ", 1, false, 1, "MiddleOfString_Whitespace_NoTrim"},
    {u"w  ", 1, true, 3, "MiddleOfString_Whitespace_Trim"},
    {u"  d", 0, false, 0, "StartOfString_Whitespace_NoTrim"},
    {u"  d", 0, true, 2, "StartOfString_Whitespace_Trim"},
    // COMBINING GRAVE ACCENT (U+0300)
    {u"wo\u0300d", 2, false, 3, "MiddleOfString_OnCombiningMark"},
    {u"wo\u0300d", 1, false, 1, "MiddleOfString_BeforeCombiningMark"},
    {u"wo\u0300d", 3, false, 3, "MiddleOfString_AfterCombiningMark"},
    {u"w o\u0300d", 1, true, 2, "MiddleOfString_SpaceAndCombinginMark_Trim"},
    {u"wo\u0300 d", 1, true, 1,
     "MiddleOfString_BeforeCombiningMarkAndSpace_Trim"},
    {u"wo\u0300 d", 2, true, 4, "MiddleOfString_OnCombiningMarkAndSpace_Trim"},
    {u"w \u0300d", 1, true, 1,
     "MiddleOfString_BeforeSpaceWithCombiningMark_Trim"},
    {u"w \u0300d", 2, true, 3, "MiddleOfString_OnSpaceWithCombiningMark_Trim"},
    {u"w  \u0300d", 1, true, 2,
     "MiddleOfString_BeforeSpaceBeforeSpaceWithCombiningMark_Trim"},
    // MUSICAL SYMBOL G CLEF (U+1D11E) + MUSICAL SYMBOL COMBINING FLAG-1
    // (U+1D16E)
    {u"w\U0001D11E\U0001D16Ed", 1, false, 1,
     "MiddleOfString_BeforeCombiningSurrogate"},
    {u"w\U0001D11E\U0001D16Ed", 2, false, 5,
     "MiddleOfString_OnCombiningSurrogate_Pos1"},
    {u"w\U0001D11E\U0001D16Ed", 3, false, 5,
     "MiddleOfString_OnCombiningSurrogate_Pos2"},
    {u"w\U0001D11E\U0001D16Ed", 4, false, 5,
     "MiddleOfString_OnCombiningSurrogate_Pos3"},
    {u"w\U0001D11E\U0001D16Ed", 5, false, 5,
     "MiddleOfString_AfterCombiningSurrogate"},
};

INSTANTIATE_TEST_CASE_P(
    ,
    FindValidBoundaryAfterTest,
    testing::ValuesIn(FindValidBoundaryAfterTest::kCases),
    [](const testing::TestParamInfo<FindValidBoundaryData>& param_info) {
      return param_info.param.name;
    });

TEST_P(FindValidBoundaryAfterTest, FindValidBoundaryAfter) {
  FindValidBoundaryData data = GetParam();
  const base::string16::const_pointer input =
      reinterpret_cast<base::string16::const_pointer>(data.input);
  size_t result =
      FindValidBoundaryAfter(input, data.index_in, data.trim_whitespace);
  EXPECT_EQ(data.index_out, result);
}

}  // namespace
}  // namespace gfx