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#include "googletest.h"
#include "mockfilesystem.h"

#include <filepathcaching.h>
#include <modifiedtimechecker.h>
#include <refactoringdatabaseinitializer.h>

namespace {

using ClangBackEnd::SourceEntries;
using ClangBackEnd::SourceType;
using ClangBackEnd::FilePathView;


class ModifiedTimeChecker : public testing::Test
{
protected:
    ModifiedTimeChecker()
    {
        ON_CALL(mockFileSystem, lastModified(Eq(1))).WillByDefault(Return(50));
        ON_CALL(mockFileSystem, lastModified(Eq(2))).WillByDefault(Return(30));
        ON_CALL(mockFileSystem, lastModified(Eq(3))).WillByDefault(Return(50));
        ON_CALL(mockFileSystem, lastModified(Eq(4))).WillByDefault(Return(30));
    }

    NiceMock<MockFileSystem> mockFileSystem;
    ClangBackEnd::ModifiedTimeChecker<> checker{mockFileSystem};
    SourceEntries upToDateEntries = {{1, SourceType::UserInclude, 100},
                                     {2, SourceType::SystemInclude, 30},
                                     {3, SourceType::UserInclude, 100},
                                     {4, SourceType::SystemInclude, 30}};
    SourceEntries notUpToDateEntries = {{1, SourceType::UserInclude, 50},
                                        {2, SourceType::SystemInclude, 20},
                                        {3, SourceType::UserInclude, 100},
                                        {4, SourceType::SystemInclude, 30}};
};

TEST_F(ModifiedTimeChecker, IsUpToDate)
{
    auto isUpToDate = checker.isUpToDate(upToDateEntries);

    ASSERT_TRUE(isUpToDate);
}

TEST_F(ModifiedTimeChecker, IsUpToDateSecondRun)
{
    checker.isUpToDate(upToDateEntries);

    auto isUpToDate = checker.isUpToDate(upToDateEntries);

    ASSERT_TRUE(isUpToDate);
}

TEST_F(ModifiedTimeChecker, IsNotUpToDateIfSourceEntriesAreEmpty)
{
    auto isUpToDate = checker.isUpToDate({});

    ASSERT_FALSE(isUpToDate);
}

TEST_F(ModifiedTimeChecker, IsNotUpToDate)
{
    auto isUpToDate = checker.isUpToDate(notUpToDateEntries);

    ASSERT_FALSE(isUpToDate);
}

TEST_F(ModifiedTimeChecker, IsNotUpToDateSecondRun)
{
    checker.isUpToDate(notUpToDateEntries);

    auto isUpToDate = checker.isUpToDate(notUpToDateEntries);

    ASSERT_FALSE(isUpToDate);
}

TEST_F(ModifiedTimeChecker, PathChangesUpdatesTimeStamps)
{
    checker.isUpToDate(upToDateEntries);

    EXPECT_CALL(mockFileSystem, lastModified(Eq(2)));
    EXPECT_CALL(mockFileSystem, lastModified(Eq(3)));

    checker.pathsChanged({2, 3});
}

TEST_F(ModifiedTimeChecker, IsNotUpToDateAnyMoreAfterUpdating)
{
    checker.isUpToDate(upToDateEntries);
    ON_CALL(mockFileSystem, lastModified(Eq(1))).WillByDefault(Return(120));
    ON_CALL(mockFileSystem, lastModified(Eq(2))).WillByDefault(Return(30));

    checker.pathsChanged({1, 2, 3});

    ASSERT_FALSE(checker.isUpToDate(upToDateEntries));
}

TEST_F(ModifiedTimeChecker, Reset)
{
    checker.isUpToDate(upToDateEntries);

    checker.reset({2, 3});

    ASSERT_FALSE(checker.isUpToDate(upToDateEntries));
}

TEST_F(ModifiedTimeChecker, UpdateNonResetedId)
{
    checker.isUpToDate(upToDateEntries);

    checker.reset({2, 3});

    ASSERT_TRUE(checker.isUpToDate({upToDateEntries[0]}));
}

TEST_F(ModifiedTimeChecker, ResetTwoTimes)
{
    checker.isUpToDate(upToDateEntries);
    checker.reset({2, 3});

    checker.reset({2, 3});

    ASSERT_FALSE(checker.isUpToDate(upToDateEntries));
    ASSERT_TRUE(checker.isUpToDate(upToDateEntries));
}

TEST_F(ModifiedTimeChecker, ResetSecondUpdate)
{
    checker.isUpToDate(upToDateEntries);
    checker.reset({2, 3});
    checker.isUpToDate(upToDateEntries);

    auto isUpToDate = checker.isUpToDate(upToDateEntries);

    ASSERT_TRUE(isUpToDate);
}

TEST_F(ModifiedTimeChecker, ResetPartialUpdate)
{
    checker.isUpToDate(upToDateEntries);
    checker.reset({2, 3});
    checker.isUpToDate({upToDateEntries[1]});

    ASSERT_FALSE(checker.isUpToDate({upToDateEntries[2]}));
}

TEST_F(ModifiedTimeChecker, ResetMoreIds)
{
    checker.isUpToDate(upToDateEntries);
    checker.reset({2, 3});

    checker.reset({1, 5});

    ASSERT_FALSE(checker.isUpToDate({upToDateEntries[2]}));
}

} // namespace