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** Copyright (C) 2016 The Qt Company Ltd.
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** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** included in the packaging of this file. Please review the following
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#include "googletest.h"

#include <stringcache.h>

#include <utils/smallstringio.h>

namespace {

using ClangBackEnd::StringCacheEntries;
using ClangBackEnd::StringCacheException;

class StringCache : public testing::Test
{
protected:
    ClangBackEnd::StringCache<Utils::PathString> cache;
    Utils::PathString filePath1{"/file/pathOne"};
    Utils::PathString filePath2{"/file/pathTwo"};
    Utils::PathString filePath3{"/file/pathThree"};
    Utils::PathString filePath4{"/file/pathFour"};
};

TEST_F(StringCache, AddFilePath)
{
    auto id = cache.stringId(filePath1);

    ASSERT_THAT(id, 0);
}

TEST_F(StringCache, AddSecondFilePath)
{
    cache.stringId(filePath1);

    auto id = cache.stringId(filePath2);

    ASSERT_THAT(id, 1);
}

TEST_F(StringCache, AddDuplicateFilePath)
{
    cache.stringId(filePath1);

    auto id = cache.stringId(filePath1);

    ASSERT_THAT(id, 0);
}

TEST_F(StringCache, AddDuplicateFilePathBetweenOtherEntries)
{
    cache.stringId(filePath1);
    cache.stringId(filePath2);
    cache.stringId(filePath3);
    cache.stringId(filePath4);

    auto id = cache.stringId(filePath3);

    ASSERT_THAT(id, 2);
}

TEST_F(StringCache, ThrowForGettingPathForNoEntry)
{
    EXPECT_ANY_THROW(cache.string(0));
}

TEST_F(StringCache, GetFilePathForIdWithOneEntry)
{
    cache.stringId(filePath1);

    auto filePath = cache.string(0);

    ASSERT_THAT(filePath, filePath1);
}

TEST_F(StringCache, GetFilePathForIdWithSomeEntries)
{
    cache.stringId(filePath1);
    cache.stringId(filePath2);
    cache.stringId(filePath3);
    cache.stringId(filePath4);

    auto filePath = cache.string(2);

    ASSERT_THAT(filePath, filePath3);
}

TEST_F(StringCache, GetAllFilePaths)
{
    cache.stringId(filePath1);
    cache.stringId(filePath2);
    cache.stringId(filePath3);
    cache.stringId(filePath4);

    const auto &filePaths = cache.strings({0, 1, 2, 3});

    ASSERT_THAT(filePaths, ElementsAre(filePath1, filePath2, filePath3, filePath4));
}

TEST_F(StringCache, AddFilePaths)
{
    auto ids = cache.stringIds({filePath1, filePath2, filePath3, filePath4});

    ASSERT_THAT(ids, ElementsAre(0, 1, 2, 3));
}

TEST_F(StringCache, IsEmpty)
{
    auto isEmpty = cache.isEmpty();

    ASSERT_TRUE(isEmpty);
}

TEST_F(StringCache, IsNotEmpty)
{
    cache.stringId(filePath1);

    auto isEmpty = cache.isEmpty();

    ASSERT_FALSE(isEmpty);
}

TEST_F(StringCache, PopulateWithEmptyVector)
{
    StringCacheEntries<Utils::PathString> entries;

    cache.uncheckedPopulate(std::move(entries));

    ASSERT_TRUE(cache.isEmpty());
}

TEST_F(StringCache, IsNotEmptyAfterPopulateWithSomeEntries)
{
    StringCacheEntries<Utils::PathString> entries{{filePath1.clone(), 0},
                                                  {filePath2.clone(), 1},
                                                  {filePath3.clone(), 2},
                                                  {filePath4.clone(), 3}};

    cache.uncheckedPopulate(std::move(entries));

    ASSERT_TRUE(!cache.isEmpty());
}

TEST_F(StringCache, GetEntryAfterPopulateWithSomeEntries)
{
    StringCacheEntries<Utils::PathString> entries{{filePath1.clone(), 0},
                                                  {filePath2.clone(), 1},
                                                  {filePath3.clone(), 2},
                                                  {filePath4.clone(), 3}};
    cache.uncheckedPopulate(std::move(entries));

    auto string = cache.string(2);

    ASSERT_THAT(string, filePath3);
}

TEST_F(StringCache, EntriesHaveUniqueIds)
{
    StringCacheEntries<Utils::PathString> entries{{filePath1.clone(), 0},
                                                  {filePath2.clone(), 1},
                                                  {filePath3.clone(), 2},
                                                  {filePath4.clone(), 2}};

    ASSERT_THROW(cache.populate(std::move(entries)), StringCacheException);
}

TEST_F(StringCache, IdsAreHigherLowerEntriesSize)
{
    StringCacheEntries<Utils::PathString> entries{{filePath1.clone(), 0},
                                                  {filePath2.clone(), 1},
                                                  {filePath3.clone(), 4},
                                                  {filePath4.clone(), 3}};

    ASSERT_THROW(cache.populate(std::move(entries)), std::out_of_range);
}

TEST_F(StringCache, MultipleEntries)
{
    StringCacheEntries<Utils::PathString> entries{{filePath1.clone(), 0},
                                                  {filePath1.clone(), 1},
                                                  {filePath3.clone(), 2},
                                                  {filePath4.clone(), 3}};

    ASSERT_THROW(cache.populate(std::move(entries)), StringCacheException);
}

}