//
// Copyright (c) ZeroC, Inc. All rights reserved.
//

#include <Ice/Ice.h>
#include <Glacier2/Glacier2.h>

#include <TestHelper.h>

#include <iostream>
#include <iomanip>
#include <list>
#include <chrono>

#include <Callback.h>

using namespace std;
using namespace std::chrono_literals;
using namespace Test;

class Client;
void notifyClient();

namespace
{

Client* instance = nullptr;

class Dispatcher final
{
public:

    void dispatch(std::function<void()> call, const shared_ptr<Ice::Connection>&)
    {
        bool wasEmpty = false;
        {
            lock_guard<mutex> lg(_mutex);
            wasEmpty = _queue.empty();
            _queue.push_back(move(call));
        }
        if(wasEmpty)
        {
            _condVar.notify_one();
        }
    }

    void destroy()
    {
        {
            lock_guard<mutex> lg(_mutex);
            _destroyed = true;
        }
        _condVar.notify_one();
    }

    void run()
    {
        for(;;)
        {
            auto item = nextItem();
            if(!item)
            {
                break;
            }
            item();
        }
    }

private:

    std::function<void()> nextItem()
    {
        unique_lock<mutex> lock(_mutex);
        while(_queue.empty())
        {
            if(_destroyed)
            {
                return nullptr;
            }
            _condVar.wait(lock);
        }
        auto item = _queue.front();
        _queue.pop_front();
        return item;
    }

    list<std::function<void()>> _queue;
    bool _destroyed = false;
    mutex _mutex;
    condition_variable _condVar;
};

class SuccessSessionCallback final : public Glacier2::SessionCallback
{
public:

    void connected(const shared_ptr<Glacier2::SessionHelper>&) override
    {
        cout << "ok" << endl;
        notifyClient();
    }

    void
    disconnected(const shared_ptr<Glacier2::SessionHelper>&) override
    {
        cout << "ok" << endl;
        notifyClient();
    }

    void
    connectFailed(const shared_ptr<Glacier2::SessionHelper>&, const Ice::Exception&) override
    {
        test(false);
    }

    void
    createdCommunicator(const shared_ptr<Glacier2::SessionHelper>& session) override
    {
        test(session->communicator());
    }
};

class AfterShutdownSessionCallback final : public Glacier2::SessionCallback
{
public:

    void
    connected(const shared_ptr<Glacier2::SessionHelper>&) override
    {
        test(false);
    }

    void
    disconnected(const shared_ptr<Glacier2::SessionHelper>&) override
    {
        test(false);
    }

    void
    connectFailed(const shared_ptr<Glacier2::SessionHelper>&, const Ice::Exception& ex) override
    {
        try
        {
            ex.ice_throw();
        }
        catch(const Ice::ConnectFailedException&)
        {
            cout << "ok" << endl;
            notifyClient();
        }
        catch(...)
        {
            test(false);
        }
    }

    void
    createdCommunicator(const shared_ptr<Glacier2::SessionHelper>& session) override
    {
        test(session->communicator());
    }
};

class FailSessionCallback final : public Glacier2::SessionCallback
{
public:

    void
    connected(const shared_ptr<Glacier2::SessionHelper>&) override
    {
        test(false);
    }

    void
    disconnected(const shared_ptr<Glacier2::SessionHelper>&) override
    {
        test(false);
    }

    void
    connectFailed(const shared_ptr<Glacier2::SessionHelper>&, const Ice::Exception& ex) override
    {
        try
        {
            ex.ice_throw();
        }
        catch(const Glacier2::PermissionDeniedException&)
        {
            cout << "ok" << endl;
            notifyClient();
        }
        catch(const Ice::LocalException&)
        {
            test(false);
        }
    }

    void
    createdCommunicator(const shared_ptr<Glacier2::SessionHelper>& session) override
    {
        test(session->communicator());
    }
};

class InterruptConnectCallback final : public Glacier2::SessionCallback
{
public:

    void
    connected(const shared_ptr<Glacier2::SessionHelper>&) override
    {
        test(false);
    }

    void
    disconnected(const shared_ptr<Glacier2::SessionHelper>&) override
    {
        test(false);
    }

    void
    connectFailed(const shared_ptr<Glacier2::SessionHelper>&, const Ice::Exception& ex) override
    {
        try
        {
            ex.ice_throw();
        }
        catch(const Ice::CommunicatorDestroyedException&)
        {
            cout << "ok" << endl;
            notifyClient();
        }
        catch(...)
        {
            test(false);
        }
    }

    void
    createdCommunicator(const shared_ptr<Glacier2::SessionHelper>& session) override
    {
        test(session->communicator());
    }
};

} // Anonymous namespace end

class Client final : public Test::TestHelper
{
public:

    void run(int, char**) override;

    void
    notify()
    {
        _condVar.notify_one();
    }

private:

    shared_ptr<Glacier2::SessionHelper> _session;
    shared_ptr<Glacier2::SessionFactoryHelper> _factory;
    Ice::InitializationData _initData;
    mutex _mutex;
    condition_variable _condVar;
};

void notifyClient()
{
    instance->notify();
}

void
Client::run(int argc, char** argv)
{
    Ice::CommunicatorHolder communicator = initialize(argc, argv);
    instance = this;
    string protocol = getTestProtocol();
    string host = getTestHost();
    _initData.properties = Ice::createProperties(argc, argv, communicator->getProperties());
    _initData.properties->setProperty("Ice.Default.Router", "Glacier2/router:" + getTestEndpoint(50));

    Dispatcher dispatcher;
    auto dfut = std::async(launch::async, [&dispatcher]{ dispatcher.run(); });

    _initData.dispatcher = [&dispatcher](std::function<void()> call, const std::shared_ptr<Ice::Connection>& conn)
                           {
                               dispatcher.dispatch(call, conn);
                           };
    _factory = make_shared<Glacier2::SessionFactoryHelper>(_initData, make_shared<FailSessionCallback>());

    //
    // Test to create a session with wrong userid/password
    //

    {
        unique_lock<mutex> lock(_mutex);

        cout << "testing SessionHelper connect with wrong userid/password... " << flush;

        _session = _factory->connect("userid", "xxx");
        //
        // Wait for connectFailed callback
        //
        _condVar.wait_for(lock, 30s);
        test(!_session->isConnected());
    }
    _factory->destroy();

    //
    // Test to interrupt connection establishment
    //

    _initData.properties->setProperty("Ice.Default.Router", "");
    _factory = make_shared<Glacier2::SessionFactoryHelper>(_initData, make_shared<InterruptConnectCallback>());

    {
        unique_lock<mutex> lock(_mutex);
        cout << "testing SessionHelper connect interrupt... " << flush;
        _factory->setRouterHost(host);
        _factory->setPort(getTestPort(_initData.properties, 1));
        _factory->setProtocol(protocol);
        _session = _factory->connect("userid", "abc123");

        this_thread::sleep_for(100ms);
        _session->destroy();

        //
        // Wait for connectFailed callback
        //
        _condVar.wait_for(lock, 30s);
        test(!_session->isConnected());
    }
    _factory->destroy();

    _factory = make_shared<Glacier2::SessionFactoryHelper>(_initData, make_shared<SuccessSessionCallback>());

    {
        unique_lock<mutex> lock(_mutex);
        cout << "testing SessionHelper connect... " << flush;
        _factory->setRouterHost(host);
        _factory->setPort(getTestPort(_initData.properties, 50));
        _factory->setProtocol(protocol);
        _session = _factory->connect("userid", "abc123");

        //
        // Wait for connect callback
        //
        _condVar.wait_for(lock, 30s);

        cout << "testing SessionHelper isConnected after connect... " << flush;
        test(_session->isConnected());
        cout << "ok" << endl;

        cout << "testing SessionHelper categoryForClient after connect... " << flush;
        try
        {
            test(!_session->categoryForClient().empty());
        }
        catch(const Glacier2::SessionNotExistException&)
        {
            test(false);
        }
        cout << "ok" << endl;

        test(!_session->session());

        cout << "testing stringToProxy for server object... " << flush;
        auto base =
            _session->communicator()->stringToProxy("callback:" + getTestEndpoint(_session->communicator()->getProperties()));
        cout << "ok" << endl;

        cout << "pinging server after session creation... " << flush;
        base->ice_ping();
        cout << "ok" << endl;

        cout << "testing checked cast for server object... " << flush;
        auto twoway = Ice::checkedCast<CallbackPrx>(base);
        test(twoway);
        cout << "ok" << endl;

        cout << "testing server shutdown... " << flush;
        twoway->shutdown();
        cout << "ok" << endl;

        test(_session->communicator());
        cout << "testing SessionHelper destroy... " << flush;
        _session->destroy();

        //
        // Wait for disconnected callback
        //
        _condVar.wait(lock);

        cout << "testing SessionHelper isConnected after destroy... " << flush;
        test(_session->isConnected() == false);
        cout << "ok" << endl;

        cout << "testing SessionHelper categoryForClient after destroy... " << flush;
        try
        {
            test(!_session->categoryForClient().empty());
            test(false);
        }
        catch(const Glacier2::SessionNotExistException&)
        {
        }
        cout << "ok" << endl;

        cout << "testing SessionHelper session after destroy... " << flush;
        test(_session->session() == nullptr);
        cout << "ok" << endl;

        cout << "testing SessionHelper communicator after destroy... " << flush;
        try
        {
            test(_session->communicator());
            _session->communicator()->stringToProxy("dummy");
            test(false);
        }
        catch(const Ice::CommunicatorDestroyedException&)
        {
        }
        cout << "ok" << endl;

        cout << "uninstalling router with communicator... " << flush;
        communicator->setDefaultRouter(nullptr);
        cout << "ok" << endl;

        shared_ptr<Ice::ObjectPrx> processBase;
        {
            cout << "testing stringToProxy for process object... " << flush;
            processBase = communicator->stringToProxy("Glacier2/admin -f Process:" + getTestEndpoint(51));
            cout << "ok" << endl;
        }

        shared_ptr<Ice::ProcessPrx> process;
        {
            cout << "testing checked cast for admin object... " << flush;
            process = Ice::checkedCast<Ice::ProcessPrx>(processBase);
            test(process != 0);
            cout << "ok" << endl;
        }

        cout << "testing Glacier2 shutdown... " << flush;
        process->shutdown();
        try
        {
            process->ice_ping();
            test(false);
        }
        catch(const Ice::LocalException&)
        {
            cout << "ok" << endl;
        }
    }

    _factory->destroy();

    _factory = make_shared<Glacier2::SessionFactoryHelper>( _initData, make_shared<AfterShutdownSessionCallback>());

    //
    // Wait a bit to ensure glaci2router has been shutdown.
    //
    this_thread::sleep_for(100ms);

    {
        unique_lock<mutex> lock(_mutex);
        cout << "testing SessionHelper connect after router shutdown... " << flush;
        _factory->setRouterHost(host);
        _factory->setPort(getTestPort(_initData.properties, 50));
        _factory->setProtocol(protocol);
        _session = _factory->connect("userid", "abc123");

        //
        // Wait for connectFailed callback
        //
        _condVar.wait(lock);

        cout << "testing SessionHelper isConnect after connect failure... " << flush;
        test(_session->isConnected() == false);
        cout << "ok" << endl;

        cout << "testing SessionHelper communicator after connect failure... " << flush;
        try
        {
            test(_session->communicator());
            _session->communicator()->stringToProxy("dummy");
            test(false);
        }
        catch(const Ice::CommunicatorDestroyedException&)
        {
        }
        cout << "ok" << endl;

        cout << "testing SessionHelper destroy after connect failure... " << flush;
        _session->destroy();
        cout << "ok" << endl;
    }

    _factory->destroy();

    // Wait for std::async thread to complete:
    dispatcher.destroy();
    dfut.get();
}

DEFINE_TEST(Client)