/*
==================================================================================

        Copyright (c) 2018-2019 AT&T Intellectual Property.

   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.
==================================================================================
*/

#ifndef XAPP_RMR_XAPP_RMR_H_
#define XAPP_RMR_XAPP_RMR_H_


#ifdef __GNUC__
#define likely(x)  __builtin_expect((x), 1)
#define unlikely(x) __builtin_expect((x), 0)
#else
#define likely(x) (x)
#define unlikely(x) (x)
#endif

#include <iostream>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <error.h>
#include <assert.h>
#include <sstream>
#include <thread>
#include <functional>
#include <map>
#include <mutex>
#include <sys/epoll.h>
#include <rmr/rmr.h>
#include <rmr/RIC_message_types.h>
#include <mdclog/mdclog.h>
#include <vector>

typedef struct{
	struct timespec ts;
	int32_t message_type;
	int32_t state;
	int32_t payload_length;
	unsigned char xid[RMR_MAX_XID]; //space for user transaction id.
	unsigned char sid[RMR_MAX_SID]; //sender ID for return to sender needs.(ACKS required)
	unsigned char src[RMR_MAX_SRC]; //name of the sender (source)
}  xapp_rmr_header;


class XappRmr{
private:
	std::string _proto_port;
	int _nattempts;
	bool _rmr_is_ready;
    bool _listen;
	void* _xapp_rmr_ctx;
	rmr_mbuf_t*		_xapp_send_buff;					// send buffer
	rmr_mbuf_t*		_xapp_received_buff;					// received buffer


public:

	XappRmr(std::string, int rmrattempts=10);
	~XappRmr(void);
	void xapp_rmr_init(void);

	template <class MessageProcessor>
	void xapp_rmr_receive(MessageProcessor&&, XappRmr *parent);
	bool xapp_rmr_send(xapp_rmr_header*, void*);

	void set_listen(bool);
	bool get_listen(void);
	int get_is_ready(void);
	bool get_isRunning(void);
	void* get_rmr_context(void);

};

// main workhorse thread which does the listen->process->respond loop
template <class MsgHandler>
void XappRmr::xapp_rmr_receive(MsgHandler&& msgproc, XappRmr *parent){

	bool* resend = new bool(false);
	// Get the thread id
	std::thread::id my_id = std::this_thread::get_id();
	std::stringstream thread_id;
	std::stringstream ss;

	thread_id << my_id;

	// Get the rmr context from parent (all threads and parent use same rmr context. rmr context is expected to be thread safe)
	if(!parent->get_is_ready()){
			mdclog_write( MDCLOG_ERR, "RMR Shows Not Ready in RECEIVER, file= %s, line=%d ",__FILE__,__LINE__);
			return;
	}
	void *rmr_context = parent->get_rmr_context();
	assert(rmr_context != NULL);

	// Get buffer specific to this thread
	this->_xapp_received_buff = NULL;
	this->_xapp_received_buff = rmr_alloc_msg(rmr_context, RMR_DEF_SIZE);
	assert(this->_xapp_received_buff != NULL);

	mdclog_write(MDCLOG_INFO, "Starting receiver thread %s",  thread_id.str().c_str());

	while(parent->get_listen()) {
		mdclog_write(MDCLOG_INFO, "Listening at Thread: %s",  thread_id.str().c_str());

		this->_xapp_received_buff = rmr_rcv_msg( rmr_context, this->_xapp_received_buff );


		if( this->_xapp_received_buff->mtype < 0 || this->_xapp_received_buff->state != RMR_OK ) {
			mdclog_write(MDCLOG_ERR, "bad msg:  state=%d  errno=%d, file= %s, line=%d", this->_xapp_received_buff->state, errno, __FILE__,__LINE__ );
			return;
		}
		else
		{
			mdclog_write(MDCLOG_INFO,"RMR Received Message of Type: %d",this->_xapp_received_buff->mtype);
			mdclog_write(MDCLOG_INFO,"RMR Received Message: %s",(char*)this->_xapp_received_buff->payload);

			//in case message handler returns true, need to resend the message.
			msgproc(this->_xapp_received_buff, resend);
			if(*resend){
				//mdclog_write(MDCLOG_INFO,"RMR Return to Sender Message of Type: %d",this->_xapp_received_buff->mtype);
				//mdclog_write(MDCLOG_INFO,"RMR Return to Sender Message: %s",(char*)this->_xapp_received_buff->payload);
				rmr_rts_msg(rmr_context, this->_xapp_received_buff );
				sleep(1);
				*resend = false;
			}
			continue;

		}

	}
	// Clean up
	try{
		delete resend;
		rmr_free_msg(this->_xapp_received_buff);
	}
	catch(std::runtime_error &e){
		std::string identifier = __FILE__ +  std::string(", Line: ") + std::to_string(__LINE__) ;
		std::string error_string = identifier = " Error freeing RMR message ";
		mdclog_write(MDCLOG_ERR, error_string.c_str(), "");
	}

	return;
}




#endif /* XAPP_RMR_XAPP_RMR_H_ */