/**********************************************************************
 * LeechCraft - modular cross-platform feature rich internet client.
 * Copyright (C) 2006-2014  Georg Rudoy
 *
 * Boost Software License - Version 1.0 - August 17th, 2003
 *
 * Permission is hereby granted, free of charge, to any person or organization
 * obtaining a copy of the software and accompanying documentation covered by
 * this license (the "Software") to use, reproduce, display, distribute,
 * execute, and transmit the Software, and to prepare derivative works of the
 * Software, and to permit third-parties to whom the Software is furnished to
 * do so, all subject to the following:
 *
 * The copyright notices in the Software and this entire statement, including
 * the above license grant, this restriction and the following disclaimer,
 * must be included in all copies of the Software, in whole or in part, and
 * all derivative works of the Software, unless such copies or derivative
 * works are solely in the form of machine-executable object code generated by
 * a source language processor.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
 * SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
 * FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 **********************************************************************/

#include "prelude.h"
#include <QtTest>
#include <prelude.h>
#include <qtutil.h>
#include <util/util.h>

QTEST_MAIN (LeechCraft::Util::PreludeTest)

namespace LeechCraft
{
namespace Util
{
	void PreludeTest::testInvokableWithConst ()
	{
		const auto lambda = [] (const QString&) {};
		static_assert (detail::IsInvokableWithConst<QString, decltype (lambda)> (), "The lambda should be invokable with const T&");
		static_assert (detail::IsInvokableWithConst<QString&, decltype (lambda)> (), "The lambda should be invokable with const T&");
		static_assert (detail::IsInvokableWithConst<const QString&, decltype (lambda)> (), "The lambda should be invokable with const T&");
		static_assert (detail::IsInvokableWithConst<QString&&, decltype (lambda)> (), "The lambda should be invokable with const T&");
		QCOMPARE (true, true);
	}

	void PreludeTest::testInvokableWithNonConst ()
	{
		const auto lambda = [] (QString&) {};
		static_assert (!detail::IsInvokableWithConst<QString, decltype (lambda)> (), "The lambda should not be invokable with const T&");
		static_assert (!detail::IsInvokableWithConst<QString&, decltype (lambda)> (), "The lambda should not be invokable with const T&");
		static_assert (!detail::IsInvokableWithConst<const QString&, decltype (lambda)> (), "The lambda should not be invokable with const T&");
		static_assert (!detail::IsInvokableWithConst<QString&&, decltype (lambda)> (), "The lambda should not be invokable with const T&");
		QCOMPARE (true, true);
	}

	namespace
	{
		QMap<int, QString> GetSimpleMap ()
		{
			QMap<int, QString> someMap;
			someMap [0] = "aaa";
			someMap [1] = "bbb";
			someMap [2] = "ccc";
			return someMap;
		}
	}

	void PreludeTest::testMapList ()
	{
		QList<int> list { 1, 2, 3 };
		const auto& otherList = Map (list, [] (int v) { return QString::number (v); });

		QCOMPARE (otherList, (QStringList { "1", "2", "3" }));
	}

	void PreludeTest::testMapMap ()
	{
		const auto& map = GetSimpleMap ();
		const auto& otherList = Map (map, [] (const QString& v) { return v.size (); });

		QCOMPARE (otherList, (QList<int> { 3, 3, 3 }));
	}

	void PreludeTest::testMapMapMutatingVoid ()
	{
		auto map = GetSimpleMap ();
		Map (map, [] (QString& v) { v += v [0]; });

		QCOMPARE (map, (Util::MakeMap<int, QString> ({ { 0, "aaaa" }, { 1, "bbbb" }, { 2, "cccc" }})));
	}

#if 0
	namespace
	{
		template<typename F>
		constexpr bool FailsImpl (typename std::result_of<F (void*)>::type*)
		{
			return false;
		}

		template<typename F>
		constexpr bool FailsImpl (...)
		{
			return true;
		}

		template<typename F>
		constexpr bool Fails ()
		{
			return FailsImpl<F> (0);
		}
	}

	void PreludeTest::testMapMapMutatingVoidConst ()
	{
		// TODO postponed until some later C++ version where SFINAE is transitive enough
		// to produce a soft error in FailsImpl() overload above.
		auto lambda = [] (const auto&)
			{
				const auto& map = GetSimpleMap ();
				Map (map, [] (QString& v) { v += "a"; });
			};
		static_assert (Fails<decltype (lambda)> (),
			"the code should fail");

		QCOMPARE (true, true);
	}
#endif

	void PreludeTest::testMapMapNonMutatingVoid ()
	{
		auto map = GetSimpleMap ();
		Map (map, [] (const QString&) {});

		QCOMPARE (map, GetSimpleMap ());
	}

	void PreludeTest::testMapMapNonMutatingVoidConst ()
	{
		const auto& map = GetSimpleMap ();
		Map (map, [] (const QString&) {});

		QCOMPARE (map, GetSimpleMap ());
	}

	void PreludeTest::testMapMapStlized ()
	{
		const auto& map = GetSimpleMap ();
		const auto& list = Map (Stlize (map), [] (const std::pair<int, QString>& pair) { return pair.second; });

		QCOMPARE (list, QStringList { map.values () });
	}

	void PreludeTest::testMapMember ()
	{
		struct Test
		{
			int m_a;
			int m_b;
		};

		const QList<Test> tests { { 1, 2 }, { 2, 4 }, { 3, 6 } };
		const auto& ints = Map (tests, &Test::m_a);

		QCOMPARE (ints, (QList<int> { 1, 2, 3 }));
	}

	void PreludeTest::testMapMemberFunction ()
	{
		struct Test
		{
			int m_a;

			int GetA () const
			{
				return m_a;
			}
		};

		const QList<Test> tests { { 1 }, { 2 }, { 3 } };
		const auto& ints = Map (tests, &Test::GetA);

		QCOMPARE (ints, (QList<int> { 1, 2, 3 }));
	}
}
}
