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#include "googletest.h"
#include "unittest-utility-functions.h"

#include <clangsupport_global.h>
#include <clangreferencescollector.h>
#include <clangdocument.h>
#include <clangdocuments.h>
#include <clangtranslationunit.h>
#include <fixitcontainer.h>
#include <sourcelocationcontainer.h>
#include <sourcerangecontainer.h>
#include <unsavedfiles.h>

#include <utils/qtcassert.h>

#include <clang-c/Index.h>

using ::testing::Contains;
using ::testing::Not;
using ::testing::ContainerEq;
using ::testing::Eq;

using ::ClangBackEnd::SourceLocationContainer;
using ::ClangBackEnd::Document;
using ::ClangBackEnd::UnsavedFiles;
using ::ClangBackEnd::ReferencesResult;
using ::ClangBackEnd::SourceRangeContainer;

using References = QVector<SourceRangeContainer>;

namespace {

struct Data {
    ClangBackEnd::UnsavedFiles unsavedFiles;
    ClangBackEnd::Documents documents{unsavedFiles};
    Document document{Utf8StringLiteral(TESTDATA_DIR"/references.cpp"),
                      UnitTest::addPlatformArguments({Utf8StringLiteral("-std=c++14")}),
                      {},
                      documents};
};

class ReferencesCollector : public ::testing::Test
{
protected:
    ReferencesResult getReferences(uint line, uint column)
    {
        return document.translationUnit().references(line, column);
    }

    SourceLocationContainer createSourceLocation(uint line, uint column) const
    {
        return SourceLocationContainer(document.filePath(), line, column);
    }

    SourceRangeContainer createSourceRange(uint line, uint column, uint length) const
    {
        return SourceRangeContainer {
            createSourceLocation(line, column),
            createSourceLocation(line, column + length)
        };
    }

    static void SetUpTestCase();
    static void TearDownTestCase();

protected:
    static std::unique_ptr<const Data> data;
    const Document &document{data->document};
};

// This test is not strictly needed as the plugin is supposed to put the cursor
// on the identifier start.
TEST_F(ReferencesCollector, CursorNotOnIdentifier)
{
    const ReferencesResult expected { false, {}, };

    const ReferencesResult actual = getReferences(3, 5);

    ASSERT_THAT(actual, expected);
}

TEST_F(ReferencesCollector, LocalVariableWithSingleUse)
{
    const ReferencesResult expected {
        true,
        {createSourceRange(3, 9, 3)},
    };

    const ReferencesResult actual = getReferences(3, 9);

    ASSERT_THAT(actual, expected);
}

TEST_F(ReferencesCollector, LocalVariableWithTwoUses)
{
    const ReferencesResult expected {
        true,
        {createSourceRange(10, 9, 3),
         createSourceRange(11, 12, 3)},
    };

    const ReferencesResult actual = getReferences(10, 9);

    ASSERT_THAT(actual, expected);
}

TEST_F(ReferencesCollector, ClassName)
{
    const ReferencesResult expected {
        false,
        {createSourceRange(16, 7, 3),
         createSourceRange(19, 5, 3)},
    };

    const ReferencesResult actual = getReferences(16, 7);

    ASSERT_THAT(actual, expected);
}

TEST_F(ReferencesCollector, Namespace)
{
    const ReferencesResult expected {
        false,
        {createSourceRange(24, 11, 1),
         createSourceRange(25, 11, 1),
         createSourceRange(26, 1, 1)},
    };

    const ReferencesResult actual = getReferences(24, 11);

    ASSERT_THAT(actual, expected);
}

TEST_F(ReferencesCollector, ClassNameDeclaredWithUsing)
{
    const ReferencesResult expected {
        false,
        {createSourceRange(30, 21, 3),
         createSourceRange(31, 10, 3)},
    };

    const ReferencesResult actual = getReferences(30, 21);

    ASSERT_THAT(actual, expected);
}

TEST_F(ReferencesCollector, ClassNameForwardDeclared)
{
    const ReferencesResult expected {
        false,
        {createSourceRange(35, 7, 3),
         createSourceRange(36, 14, 3)},
    };

    const ReferencesResult actual = getReferences(35, 7);

    ASSERT_THAT(actual, expected);
}

TEST_F(ReferencesCollector, ClassNameAndNewExpression)
{
    const ReferencesResult expected {
        false,
        {createSourceRange(40, 7, 3),
         createSourceRange(43, 9, 3)},
    };

    const ReferencesResult actual = getReferences(40, 7);

    ASSERT_THAT(actual, expected);
}

TEST_F(ReferencesCollector, InstantiatedTemplateObject)
{
    const ReferencesResult expected {
        true,
        {createSourceRange(52, 19, 3),
         createSourceRange(53, 5, 3)},
    };

    const ReferencesResult actual = getReferences(52, 19);

    ASSERT_THAT(actual, expected);
}

TEST_F(ReferencesCollector, VariableInTemplate)
{
    const ReferencesResult expected {
        true,
        {createSourceRange(62, 13, 3),
         createSourceRange(63, 11, 3)},
    };

    const ReferencesResult actual = getReferences(62, 13);

    ASSERT_THAT(actual, expected);
}

TEST_F(ReferencesCollector, MemberInTemplate)
{
    const ReferencesResult expected {
        false,
        {createSourceRange(64, 16, 3),
         createSourceRange(67, 7, 3)},
    };

    const ReferencesResult actual = getReferences(67, 7);

    ASSERT_THAT(actual, expected);
}

TEST_F(ReferencesCollector, TemplateType)
{
    const ReferencesResult expected {
        false,
        {createSourceRange(58, 19, 1),
         createSourceRange(60, 5, 1),
         createSourceRange(67, 5, 1)},
    };

    const ReferencesResult actual = getReferences(58, 19);

    ASSERT_THAT(actual, expected);
}

TEST_F(ReferencesCollector, MemberAccessIntoTemplateParameter)
{
    const ReferencesResult expected { false, {}, };

    const ReferencesResult actual = getReferences(76, 9);

    ASSERT_THAT(actual, expected);
}

TEST_F(ReferencesCollector, ConstructorAsType)
{
    const ReferencesResult expected {
        false,
        {createSourceRange(81, 8, 3),
         createSourceRange(82, 5, 3),
         createSourceRange(83, 6, 3)},
    };

    const ReferencesResult actual = getReferences(82, 5);

    ASSERT_THAT(actual, expected);
}

TEST_F(ReferencesCollector, OverloadsFreeStanding)
{
    const ReferencesResult expected {
        false,
        {createSourceRange(88, 5, 3),
         createSourceRange(89, 5, 3)},
    };

    const ReferencesResult actual = getReferences(88, 5);

    ASSERT_THAT(actual, expected);
}

TEST_F(ReferencesCollector, OverloadsMemberFunctions)
{
    const ReferencesResult expected {
        false,
        {createSourceRange(94, 9, 3),
         createSourceRange(95, 9, 3)},
    };

    const ReferencesResult actual = getReferences(94, 9);

    ASSERT_THAT(actual, expected);
}

TEST_F(ReferencesCollector, FunctionAndTemplateFunction)
{
    const ReferencesResult expected {
        false,
        {createSourceRange(100, 26, 3),
         createSourceRange(101, 5, 3)},
    };

    const ReferencesResult actual = getReferences(100, 26);

    ASSERT_THAT(actual, expected);
}

TEST_F(ReferencesCollector, FunctionAndTemplateFunctionAsMember)
{
    const ReferencesResult expected {
        false,
        {createSourceRange(106, 30, 3),
         createSourceRange(107, 9, 3)},
    };

    const ReferencesResult actual = getReferences(106, 30);

    ASSERT_THAT(actual, expected);
}

TEST_F(ReferencesCollector, EnumType)
{
    const ReferencesResult expected {
        false,
        {createSourceRange(112, 6, 2),
         createSourceRange(113, 8, 2)},
    };

    const ReferencesResult actual = getReferences(112, 6);

    ASSERT_THAT(actual, expected);
}

TEST_F(ReferencesCollector, LambdaCapturedObject)
{
    const ReferencesResult expected {
        true,
        {createSourceRange(122, 15, 3),
         createSourceRange(122, 33, 3)},
    };

    const ReferencesResult actual = getReferences(122, 15);

    ASSERT_THAT(actual, expected);
}

//// Disabled because it looks like the lambda initializer is not yet exposed by libclang.
TEST_F(ReferencesCollector, DISABLED_LambdaCaptureInitializer)
{
    const ReferencesResult expected {
        true,
        {createSourceRange(121, 19, 3),
         createSourceRange(122, 19, 3)},
    };

    const ReferencesResult actual = getReferences(122, 19);

    ASSERT_THAT(actual, expected);
}

TEST_F(ReferencesCollector, TemplateSpecialization)
{
    const ReferencesResult expected {
        false,
        {createSourceRange(127, 25, 3),
         createSourceRange(128, 25, 3),
         createSourceRange(129, 18, 3)},
    };

    const ReferencesResult actual = getReferences(127, 25);

    ASSERT_THAT(actual, expected);
}

TEST_F(ReferencesCollector, TemplateDependentName)
{
    const ReferencesResult expected {
        false,
        {createSourceRange(133, 34, 3)},
    };

    const ReferencesResult actual = getReferences(133, 34);

    ASSERT_THAT(actual, expected);
}

TEST_F(ReferencesCollector, FunctionCallAndDefinition)
{
    const ReferencesResult expected {
        false,
        {createSourceRange(140, 5, 3),
         createSourceRange(142, 25, 3)},
    };

    const ReferencesResult actual = getReferences(140, 5);

    ASSERT_THAT(actual, expected);
}

TEST_F(ReferencesCollector, ObjectLikeMacro)
{
    const ReferencesResult expected {
        false,
        {createSourceRange(147, 9, 3),
         createSourceRange(150, 12, 3)},
    };

    const ReferencesResult actual = getReferences(147, 9);

    ASSERT_THAT(actual, expected);
}

TEST_F(ReferencesCollector, FunctionLikeMacro)
{
    const ReferencesResult expected {
        false,
        {createSourceRange(155, 9, 3),
         createSourceRange(158, 12, 3)},
    };

    const ReferencesResult actual = getReferences(155, 9);

    ASSERT_THAT(actual, expected);
}

TEST_F(ReferencesCollector, ArgumentToFunctionLikeMacro)
{
    const ReferencesResult expected {
        true,
        {createSourceRange(156, 27, 3),
         createSourceRange(158, 16, 3)},
    };

    const ReferencesResult actual = getReferences(156, 27);

    ASSERT_THAT(actual, expected);
}

TEST_F(ReferencesCollector, OverloadedBraceOperatorArgument)
{
    const ReferencesResult expected {
        true,
        {createSourceRange(171, 7, 1),
         createSourceRange(172, 7, 1),
         createSourceRange(172, 12, 1),
         createSourceRange(173, 7, 1),
         createSourceRange(173, 10, 1)},
    };

    const ReferencesResult actual = getReferences(172, 7);

    ASSERT_THAT(actual, expected);
}

TEST_F(ReferencesCollector, OverloadedParenOperatorSecondArgument)
{
    const ReferencesResult expected {
        true,
        {createSourceRange(171, 7, 1),
         createSourceRange(172, 7, 1),
         createSourceRange(172, 12, 1),
         createSourceRange(173, 7, 1),
         createSourceRange(173, 10, 1)},
    };

    const ReferencesResult actual = getReferences(173, 10);

    ASSERT_THAT(actual, expected);
}

TEST_F(ReferencesCollector, OverloadedOperatorsArgumentsFromOutside)
{
    const ReferencesResult expected {
        true,
        {createSourceRange(171, 7, 1),
         createSourceRange(172, 7, 1),
         createSourceRange(172, 12, 1),
         createSourceRange(173, 7, 1),
         createSourceRange(173, 10, 1)},
    };

    const ReferencesResult actual = getReferences(171, 7);

    ASSERT_THAT(actual, expected);
}

std::unique_ptr<const Data> ReferencesCollector::data;

void ReferencesCollector::SetUpTestCase()
{
    data = std::make_unique<const Data>();

    data->document.parse();
}

void ReferencesCollector::TearDownTestCase()
{
    data.reset();
}

} // anonymous namespace