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/*
 *  Copyright (c) 2005 Ian McDonald <imcdnzl@gmail.com>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */


#include "common.hpp"

int do_transmit(ifstream *fp, int sockfd, enum proto default_proto, struct sockaddr_in server) {
	char * sendline = (char*) calloc(MAXLINE, sizeof(char));

	int64_t read, unitsize, toTransfer, readBytes;
	int length = sizeof(struct sockaddr_in);
	int ssize, nwritten;

	int mtu_size = 256;
	socklen_t sizeMTU = (socklen_t) sizeof(mtu_size);
	if (default_proto == DCCP) {
		getsockopt(sockfd, SOL_DCCP, DCCP_SOCKOPT_GET_CUR_MPS,(socklen_t*) &mtu_size, &sizeMTU);
	}

	read = 0;
	unitsize = 0;
	toTransfer = fileSize;

	while (toTransfer > 0) {
		if (default_proto == DCCP && mtu_size < MAXLINE) {
			unitsize = ((toTransfer >= mtu_size) ? mtu_size : toTransfer);
		}
		else {
			unitsize = ((toTransfer >= MAXLINE) ? MAXLINE : toTransfer);
		}

		fp->read(sendline, unitsize);

		ssize = 0;
		nwritten = 0;

		while (ssize < unitsize) {
			switch(default_proto) {
				case TCP:
					if ((nwritten = send(sockfd, sendline + ssize, unitsize - ssize, 0)) < 0) {
						return -1;
					}
					break;

				case DCCP:
					do {
						nwritten = send(sockfd, sendline + ssize, unitsize - ssize, 0);
					} while (nwritten < 0 && errno == EAGAIN);
					break;

				case UDP:
					if ((nwritten = sendto(sockfd,sendline + ssize,unitsize - ssize, 0, (const sockaddr*) &server, length)) < 0) {
						return -1;
					}
					break;

				case PUDT:
					if (UDT::ERROR == (nwritten = UDT::send(sockfd, sendline + ssize, unitsize - ssize, 0))) {
						cout << "send:" << UDT::getlasterror().getErrorMessage() << endl;
						return -1;
					}
					break;
			}

			ssize += nwritten;
		}

		toTransfer -= unitsize;
	}

	fp->close();
	delete fp;
	free(sendline);

	return 0;
}

int main(int argc, char **argv) {
	int sockfd;
	struct sockaddr_in servaddr;
	struct addrinfo *hostinfo;
	char *host;
	struct hostent *hp;
	string protoName;

	int ind = 1;
	while (ind < argc) {
		switch (argv[ind][1]) {
			// protocol
			case 'P':
				protoName = string(argv[++ind]);
				if (strcmp(protoName.c_str(),"TCP")==0) {
					default_proto = TCP;
				}
				else if (strcmp(protoName.c_str(),"DCCP")==0) {
					default_proto = DCCP;
				}
				else if (strcmp(protoName.c_str(),"UDP")==0) {
					default_proto = UDP;
				}
				else if (strcmp(protoName.c_str(),"UDT")==0) {
					default_proto = PUDT;
				}
				else {
					goto usage;
				}
				break;

			// port
			case 'p':
				port = string(argv[++ind]);
				break;

			// server
			case 's':
				host = argv[++ind];

				break;
			// file
			case 'f':
				file = string(argv[++ind]);
				break;

			case 'h':
				goto usage;
				break;

			default:
				goto usage;
				break;
		}

		ind++;
	}

	if (default_proto == PUDT) {
		UDT::startup();
	}

	cout << "Using protocol " << usedProto(default_proto).c_str() << endl;
	cout << "Connecting to host " << host << " on port " << port.c_str() << endl;

	if ((sockfd = make_socket()) < 0) {
		printerrno("socket");
		return 1;
	}

	servaddr.sin_family = AF_INET;
	hp = gethostbyname(host);

	if (hp == 0) {
		printerrno("Unknown host");
		return -1;
	}

	bcopy((char *)hp->h_addr, (char *)&servaddr.sin_addr, hp->h_length);
	servaddr.sin_port = htons(str_to_int(port));

	if (getaddrinfo(host, port.c_str(), NULL, &hostinfo)) {
		printerrno("getaddrinfo");
		return 1;
	}

	socket_options(sockfd);	

	if (errno) {
		printerrno("socket_options");
		return 1;
	}

	if (default_proto != UDP) {

#ifdef DCCP_SOCKOPT_CCID
		if (default_proto == DCCP) {
			int ccid = 3;
			setsockopt(sockfd, SOL_DCCP, DCCP_SOCKOPT_CCID,(uint8_t*) &ccid, sizeof(uint8_t));
			if (errno) {
                        	printerrno("CCID");
                        	return -1;
                	}
                        cout << "Using CCID " << ccid << endl;
		}
#endif

		if (default_proto != PUDT) {
			connect(sockfd, (const struct sockaddr *) &servaddr, sizeof(servaddr));
		}
		else {
			if (UDT::ERROR == UDT::connect(sockfd, (const struct sockaddr *) &servaddr, sizeof(servaddr)))
			{
				cout << "connect: " << UDT::getlasterror().getErrorMessage() << endl;
				return -1;
			}
		}

		if (errno) {
			printerrno("connect");
			return 1;
		}
	}

	cout << "Begin to transfer file: " << file.c_str() << endl;

	ifstream *fp;
	fp = new ifstream(file.c_str(), ios::in | ios::binary);;

	if (!fp) {
		cout << "couldn't open file" << endl;
		return -1;
	}

	do_transmit(fp, sockfd,(enum proto) default_proto, servaddr);
	
	if (default_proto == PUDT) {
		UDT::close(sockfd);
		UDT::cleanup();
	}

	return 0;

usage:
	cerr << "-P protocol name defines the protocol to use where proto" << endl;
	cerr << "\t can be TCP, DCCP, UDP or UDT" << endl;
	cerr << "-p port defines the port to connect to" << endl;
	cerr << "-s server defines the server address to connect to" << endl;
	cerr << "-f file the file to be send" << endl;
	cerr << "-h prints this help and exits" << endl;

	return 1;
}