// Copyright 2016 Proyectos y Sistemas de Mantenimiento SL (eProsima).
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

/**
 * @file HelloWorldSubscriber.cpp
 *
 */

#include "HelloWorldSubscriber.h"
#include <fastdds/dds/domain/DomainParticipantFactory.hpp>
#include <fastdds/dds/subscriber/qos/DataReaderQos.hpp>
#include <fastdds/rtps/transport/shared_mem/SharedMemTransportDescriptor.h>
#include <fastdds/rtps/transport/UDPv4TransportDescriptor.h>

using namespace eprosima::fastdds::dds;
using namespace eprosima::fastdds::rtps;
using namespace eprosima::fastrtps::rtps;

HelloWorldSubscriber::HelloWorldSubscriber()
    : participant_(nullptr)
    , subscriber_(nullptr)
    , topic_(nullptr)
    , reader_(nullptr)
    , type_(new HelloWorldPubSubType())
{
}

bool HelloWorldSubscriber::init()
{

    //CREATE THE PARTICIPANT
    DomainParticipantQos pqos;
    pqos.wire_protocol().builtin.discovery_config.discoveryProtocol = DiscoveryProtocol_t::SIMPLE;
    pqos.wire_protocol().builtin.discovery_config.use_SIMPLE_EndpointDiscoveryProtocol = true;
    pqos.wire_protocol().builtin.discovery_config.m_simpleEDP.use_PublicationReaderANDSubscriptionWriter = true;
    pqos.wire_protocol().builtin.discovery_config.m_simpleEDP.use_PublicationWriterANDSubscriptionReader = true;
    pqos.wire_protocol().builtin.discovery_config.leaseDuration = eprosima::fastrtps::c_TimeInfinite;
    pqos.name("Participant_sub");

    // Explicit configuration of SharedMem transport
    pqos.transport().use_builtin_transports = false;

    auto sm_transport = std::make_shared<SharedMemTransportDescriptor>();
    sm_transport->segment_size(2 * 1024 * 1024);
    pqos.transport().user_transports.push_back(sm_transport);

    participant_ = DomainParticipantFactory::get_instance()->create_participant(0, pqos);

    if (participant_ == nullptr)
    {
        return false;
    }

    //REGISTER THE TYPE
    type_.register_type(participant_);

    //CREATE THE SUBSCRIBER
    subscriber_ = participant_->create_subscriber(SUBSCRIBER_QOS_DEFAULT);

    if (subscriber_ == nullptr)
    {
        return false;
    }

    //CREATE THE TOPIC
    topic_ = participant_->create_topic("HelloWorldSharedMemTopic", "HelloWorld", TOPIC_QOS_DEFAULT);

    if (topic_ == nullptr)
    {
        return false;
    }

    //CREATE THE DATAREADER
    DataReaderQos rqos;
    rqos.history().kind = KEEP_LAST_HISTORY_QOS;
    rqos.history().depth = 30;
    rqos.resource_limits().max_samples = 50;
    rqos.resource_limits().allocated_samples = 20;
    rqos.reliability().kind = RELIABLE_RELIABILITY_QOS;
    rqos.durability().kind = TRANSIENT_LOCAL_DURABILITY_QOS;

    reader_ = subscriber_->create_datareader(topic_, rqos, &listener_);

    if (reader_ == nullptr)
    {
        return false;
    }

    return true;
}

HelloWorldSubscriber::~HelloWorldSubscriber()
{
    if (reader_ != nullptr)
    {
        subscriber_->delete_datareader(reader_);
    }
    if (topic_ != nullptr)
    {
        participant_->delete_topic(topic_);
    }
    if (subscriber_ != nullptr)
    {
        participant_->delete_subscriber(subscriber_);
    }
    DomainParticipantFactory::get_instance()->delete_participant(participant_);
}

void HelloWorldSubscriber::SubListener::on_subscription_matched(
        DataReader*,
        const SubscriptionMatchedStatus& info)
{
    if (info.current_count_change == 1)
    {
        matched_ = info.total_count;
        std::cout << "Subscriber matched." << std::endl;
    }
    else if (info.current_count_change == -1)
    {
        matched_ = info.total_count;
        std::cout << "Subscriber unmatched." << std::endl;
    }
    else
    {
        std::cout << info.current_count_change
                  << " is not a valid value for SubscriptionMatchedStatus current count change" << std::endl;
    }
}

void HelloWorldSubscriber::SubListener::on_data_available(
        DataReader* reader)
{
    SampleInfo info;
    if (reader->take_next_sample(hello_.get(), &info) == ReturnCode_t::RETCODE_OK)
    {
        if (info.valid_data)
        {
            samples_++;
            const size_t data_size = hello_->data().size();
            // Print your structure data here.
            std::cout << "Message " << hello_->message() << " " << hello_->index()
                      << " RECEIVED With " << data_size << "(bytes) of Data. DataEnd = "
                      << (char*)&hello_->data()[data_size - 9] << std::endl;
        }
    }
}

void HelloWorldSubscriber::run()
{
    std::cout << "Subscriber running. Please press enter to stop the Subscriber" << std::endl;
    std::cin.ignore();
}

void HelloWorldSubscriber::run(
        uint32_t number)
{
    std::cout << "Subscriber running until " << number << "samples have been received" << std::endl;
    while (number > this->listener_.samples_)
    {
        std::this_thread::sleep_for(std::chrono::milliseconds(500));
    }
}
