// Copyright 2022 The Tint Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#include "src/tint/source.h"

#include <memory>
#include <utility>

#include "gtest/gtest.h"

namespace tint {
namespace {

static constexpr const char* kSource = R"(line one
line two
line three)";

using SourceFileContentTest = testing::Test;

TEST_F(SourceFileContentTest, Ctor) {
    Source::FileContent fc(kSource);
    EXPECT_EQ(fc.data, kSource);
    EXPECT_EQ(fc.data_view, kSource);
    ASSERT_EQ(fc.lines.size(), 3u);
    EXPECT_EQ(fc.lines[0], "line one");
    EXPECT_EQ(fc.lines[1], "line two");
    EXPECT_EQ(fc.lines[2], "line three");
}

TEST_F(SourceFileContentTest, CopyCtor) {
    auto src = std::make_unique<Source::FileContent>(kSource);
    Source::FileContent fc{*src};
    src.reset();
    EXPECT_EQ(fc.data, kSource);
    EXPECT_EQ(fc.data_view, kSource);
    ASSERT_EQ(fc.lines.size(), 3u);
    EXPECT_EQ(fc.lines[0], "line one");
    EXPECT_EQ(fc.lines[1], "line two");
    EXPECT_EQ(fc.lines[2], "line three");
}

TEST_F(SourceFileContentTest, MoveCtor) {
    auto src = std::make_unique<Source::FileContent>(kSource);
    Source::FileContent fc{std::move(*src)};
    src.reset();
    EXPECT_EQ(fc.data, kSource);
    EXPECT_EQ(fc.data_view, kSource);
    ASSERT_EQ(fc.lines.size(), 3u);
    EXPECT_EQ(fc.lines[0], "line one");
    EXPECT_EQ(fc.lines[1], "line two");
    EXPECT_EQ(fc.lines[2], "line three");
}

// Line break code points
#define kCR "\r"
#define kLF "\n"
#define kVTab "\x0B"
#define kFF "\x0C"
#define kNL "\xC2\x85"
#define kLS "\xE2\x80\xA8"
#define kPS "\xE2\x80\xA9"

using LineBreakTest = testing::TestWithParam<const char*>;
TEST_P(LineBreakTest, Single) {
    std::string src = "line one";
    src += GetParam();
    src += "line two";

    Source::FileContent fc(src);
    EXPECT_EQ(fc.lines.size(), 2u);
    EXPECT_EQ(fc.lines[0], "line one");
    EXPECT_EQ(fc.lines[1], "line two");
}
TEST_P(LineBreakTest, Double) {
    std::string src = "line one";
    src += GetParam();
    src += GetParam();
    src += "line two";

    Source::FileContent fc(src);
    EXPECT_EQ(fc.lines.size(), 3u);
    EXPECT_EQ(fc.lines[0], "line one");
    EXPECT_EQ(fc.lines[1], "");
    EXPECT_EQ(fc.lines[2], "line two");
}
INSTANTIATE_TEST_SUITE_P(SourceFileContentTest,
                         LineBreakTest,
                         testing::Values(kVTab, kFF, kNL, kLS, kPS, kLF, kCR, kCR kLF));

}  // namespace
}  // namespace tint