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#include "googletest.h"

#include <clangbackend_global.h>
#include <clangexceptions.h>
#include <clangtranslationunit.h>
#include <clangtranslationunits.h>
#include <utf8string.h>

#include <clang-c/Index.h>

using ClangBackEnd::Clock;
using ClangBackEnd::TranslationUnit;
using ClangBackEnd::TranslationUnits;
using ClangBackEnd::TranslationUnitDoesNotExist;
using ClangBackEnd::PreferredTranslationUnit;

using testing::Eq;

namespace {

class TranslationUnits : public ::testing::Test
{
protected:
    Utf8String someFilePath = Utf8StringLiteral("someFilePath");
    ClangBackEnd::TranslationUnits translationUnits{someFilePath};
};

TEST_F(TranslationUnits, CreatedUnitIsNull)
{
    TranslationUnit translationUnit = translationUnits.createAndAppend();

    ASSERT_TRUE(translationUnit.isNull());
}

TEST_F(TranslationUnits, GetThrowsForNotExisting)
{
    ASSERT_THROW(translationUnits.get(), TranslationUnitDoesNotExist);
}

TEST_F(TranslationUnits, GetForSingleTranslationUnit)
{
    const TranslationUnit created = translationUnits.createAndAppend();

    const TranslationUnit queried = translationUnits.get();

    ASSERT_THAT(queried.id(), Eq(created.id()));
}

TEST_F(TranslationUnits, GetFirstForMultipleTranslationUnits)
{
    const TranslationUnit created1 = translationUnits.createAndAppend();
    translationUnits.createAndAppend();

    const TranslationUnit queried = translationUnits.get();

    ASSERT_THAT(queried.id(), Eq(created1.id()));
}

TEST_F(TranslationUnits, GetFirstForMultipleTranslationUnitsAndOnlyFirstParsed)
{
    const TranslationUnit created1 = translationUnits.createAndAppend();
    translationUnits.updateParseTimePoint(created1.id(), Clock::now());
    translationUnits.createAndAppend();

    const TranslationUnit queried = translationUnits.get();

    ASSERT_THAT(queried.id(), Eq(created1.id()));
}

TEST_F(TranslationUnits, GetFirstForMultipleTranslationUnitsAndOnlySecondParsed)
{
    const TranslationUnit created1 = translationUnits.createAndAppend();
    const TranslationUnit created2 = translationUnits.createAndAppend();
    translationUnits.updateParseTimePoint(created2.id(), Clock::now());

    const TranslationUnit queried = translationUnits.get();

    ASSERT_THAT(queried.id(), Eq(created1.id()));
}

TEST_F(TranslationUnits, GetLastUnitializedForMultipleTranslationUnits)
{
    const TranslationUnit created1 = translationUnits.createAndAppend();
    translationUnits.updateParseTimePoint(created1.id(), Clock::now());
    const TranslationUnit created2 = translationUnits.createAndAppend();

    const TranslationUnit queried = translationUnits.get(PreferredTranslationUnit::LastUninitialized);

    ASSERT_THAT(queried.id(), Eq(created2.id()));
}

TEST_F(TranslationUnits, GetRecentForMultipleTranslationUnits)
{
    const TranslationUnit created1 = translationUnits.createAndAppend();
    translationUnits.updateParseTimePoint(created1.id(), Clock::now());
    const TranslationUnit created2 = translationUnits.createAndAppend();
    translationUnits.updateParseTimePoint(created2.id(), Clock::now());

    const TranslationUnit queried = translationUnits.get(PreferredTranslationUnit::RecentlyParsed);

    ASSERT_THAT(queried.id(), Eq(created2.id()));
}

TEST_F(TranslationUnits, GetPreviousForMultipleTranslationUnits)
{
    const TranslationUnit created1 = translationUnits.createAndAppend();
    translationUnits.updateParseTimePoint(created1.id(), Clock::now());
    const TranslationUnit created2 = translationUnits.createAndAppend();
    translationUnits.updateParseTimePoint(created2.id(), Clock::now());

    const TranslationUnit queried = translationUnits.get(PreferredTranslationUnit::PreviouslyParsed);

    ASSERT_THAT(queried.id(), Eq(created1.id()));
}

TEST_F(TranslationUnits, UpdateThrowsForNotExisting)
{
    ClangBackEnd::TranslationUnits otherTranslationUnits{someFilePath};
    const TranslationUnit translationUnit = otherTranslationUnits.createAndAppend();

    ASSERT_THROW(translationUnits.updateParseTimePoint(translationUnit.id(), Clock::now()),
                 TranslationUnitDoesNotExist);
}

} // anonymous namespace