/*
 * Copyright (c) 2014 Eran Pe'er.
 *
 * This program is made available under the terms of the MIT License.
 *
 * Created on Mar 10, 2014
 */

#include <string>
#include <iosfwd>
#include <stdexcept>
#include <tuple>

#include "tpunit++.hpp"
#include "fakeit.hpp"

using namespace fakeit;

struct EventNotification: tpunit::TestFixture {
	EventNotification()
			: tpunit::TestFixture(
					//
					TEST(EventNotification::handle_UnexpectedMethodCallEvent),
					TEST(EventNotification::handle_SequenceVerificationEvent),
					TEST(EventNotification::handle_NoMoreInvocationsVerificationEvent),
					TEST(
							EventNotification::ShouldThrow_UnexpectedMethodCallException_IfAdapterDidNotThrowException_WhenHandlingAnUnmatchedInvocation),
					TEST(
							EventNotification::ShouldThrow_UnexpectedMethodCallException_IfAdapterDidNotThrowException_WhenHandlingNoMoreRecordedActionException)
			) //
	{
	}

	class FakeEventListener: public EventHandler {
	public:

		class AssertionException {
		public:
			AssertionException(std::string msg)
					: _msg(msg) {
			}
			std::string _msg;
		};

		virtual void handle(const UnexpectedMethodCallEvent&) {
			throw AssertionException("UnexpectedMethodCallEvent");
		}

		virtual void handle(const SequenceVerificationEvent&) {
			throw AssertionException("SequenceVerificationEvent");
		}

		virtual void handle(const NoMoreInvocationsVerificationEvent&) {
			throw AssertionException("NoMoreInvocationsVerificationEvent");
		}
	};

	class NullEventHandler: public fakeit::EventHandler {

		virtual void handle(const UnexpectedMethodCallEvent&) {
		}

		virtual void handle(const SequenceVerificationEvent&) {
		}

		virtual void handle(const NoMoreInvocationsVerificationEvent&) {
		}

		NullEventHandler(NullEventHandler&) = delete;

	public:
		NullEventHandler() = default;
	};

	template<typename T> std::string to_string(T& val) {
		std::stringstream stream;
		stream << val;
		return stream.str();
	}

	struct SomeInterface {
		virtual int func(int) = 0;
	};

	class finally {
	private:
		std::function<void()> finallyClause;
		finally(const finally &);
		finally& operator=(const finally &);
	public:
		explicit finally(std::function<void()> f)
				: finallyClause(f) {
		}

		~finally() {
			finallyClause();
		}
	};

	static void setup() {
		static FakeEventListener listener;
		Fakeit.addEventHandler(listener);
	}

	static void teardown() {
		Fakeit.clearEventHandlers();
		Fakeit.resetTestingFrameworkAdapter();
	}

	void handle_UnexpectedMethodCallEvent() {
		setup();
		finally onExit(teardown);
		Mock<SomeInterface> mock;
		SomeInterface &i = mock.get();
		try {
			i.func(1);
			FAIL();
		} catch (FakeEventListener::AssertionException& e) {
			std::string expectedMsg { "UnexpectedMethodCallEvent" };
			ASSERT_EQUAL(expectedMsg, e._msg);
		}
	}

	void handle_SequenceVerificationEvent() {
		setup();
		finally onExit(teardown);
		Mock<SomeInterface> mock;
		try {
			fakeit::Verify(Method(mock, func)).setFileInfo("test file", 1, "test method").Exactly(Once);
		} catch (FakeEventListener::AssertionException& e) {
			std::string expectedMsg { "SequenceVerificationEvent" };
			ASSERT_EQUAL(expectedMsg, e._msg);
		}
	}

	void handle_NoMoreInvocationsVerificationEvent() {
		setup();
		finally onExit(teardown);
		Mock<SomeInterface> mock;
		try {
			Fake(Method(mock, func));
			mock.get().func(1);
			mock.get().func(2);
			fakeit::Verify(Method(mock, func).Using(1)).setFileInfo("test file", 1, "test method");
			fakeit::VerifyNoOtherInvocations(Method(mock, func)) //
			.setFileInfo("test file", 1, "test method");

		} catch (FakeEventListener::AssertionException& e) {
			std::string expectedMsg { "NoMoreInvocationsVerificationEvent" };
			ASSERT_EQUAL(expectedMsg, e._msg);
		}
	}

	void ShouldThrow_UnexpectedMethodCallException_IfAdapterDidNotThrowException_WhenHandlingAnUnmatchedInvocation() {
		setup();
		finally onExit(teardown);
		Mock<SomeInterface> mock;
		Fake(Method(mock,func).Using(1));
		SomeInterface &i = mock.get();
		try {
			i.func(100);
			FAIL();
		} catch (FakeEventListener::AssertionException& e) {
			std::string expectedMsg { "UnexpectedMethodCallEvent" };
			ASSERT_EQUAL(expectedMsg, e._msg);
		}
	}

	void ShouldThrow_UnexpectedMethodCallException_IfAdapterDidNotThrowException_WhenHandlingNoMoreRecordedActionException() {
		setup();
		finally onExit(teardown);
		Mock<SomeInterface> mock;
		When(Method(mock,func)).Return(0);
		SomeInterface &i = mock.get();
		i.func(1);
		try {
			i.func(1);
			FAIL();
		} catch (FakeEventListener::AssertionException& e) {
			std::string expectedMsg { "UnexpectedMethodCallEvent" };
			ASSERT_EQUAL(expectedMsg, e._msg);
		}
	}
} __EventNotification;