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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"

void* dostuff(void*);

void* dostuff(void* sock) {
	//int*  data = reinterpret_cast<int*>(sock);
	int   sockfd;
	memcpy(&sockfd,sock,sizeof(sockfd));

	//delete data;
	ssize_t n;
	char buf[MAXLINE];
	char outstr[MAXLINE];
	int64_t size = 4294967295;
	int64_t readChars = 0;

	int64_t unitsize = 0;
	int64_t toTransfer = 4294967295;

	do {
		readChars = 0;

		fstream* fs;
		fs = new fstream(default_dest_path.c_str(), ios::out | ios::in | ios::binary | ios::trunc);


		if (default_proto != UDP) {
			//n = read(sockfd,(char *) &size, sizeof(int64_t));

			while (toTransfer > 0) {
				unitsize = ((toTransfer >= MAXLINE) ? MAXLINE : toTransfer);

				n = recv(sockfd,buf,MAXLINE,0);
				strncpy(outstr,buf,n);
				outstr[n] = '\0'; // should really check if N ==  MAXLINE

				fs->write(buf, MAXLINE);
				toTransfer -= unitsize;
				//cout << outstr;
			}
		}
		else {
			//n = recv(sockfd, (char*) &size, sizeof(int64_t), 0);

			while (toTransfer > 0) {
				unitsize = ((toTransfer >= MAXLINE) ? MAXLINE : toTransfer);

				n = recv(sockfd,buf,MAXLINE, 0);

				strncpy(outstr,buf,n);
				outstr[n] = '\0'; // should really check if N ==  MAXLINE
				if (n == 0)
						printerrno("dostuff UDP");
				//cout << outstr;
				fs->write(buf, MAXLINE);

				toTransfer -= unitsize;
				//readChars += MAXLINE;
			}
		}
		fs->flush();
		fs->close();
		delete (fs);

		toTransfer = size;

	} while (n < 0 && errno == EINTR);


	if (n < 0)
		printerrno("dostuff");
}

int main(int argc, char **argv) {
	int listenfd, connfd;
	struct sockaddr_in servaddr, cliaddr;
	socklen_t clilen;
	string test;
	pid_t childpid;

	//argv++;
	//argc--;

	int ind = 1;
	while (ind < argc) {
		//cout << ind << argv[ind] << endl;
		switch (argv[ind][1]) {
			// protocol
			case 'P':
				test = string(argv[++ind]);
				if (strcmp(test.c_str(),"TCP")==0) {
					default_proto = TCP;
					printf("Using TCP\n");
				} else if (strcmp(test.c_str(),"DCCP")==0) {
					default_proto = DCCP;
					printf("Using DCCP\n");
				} else if (strcmp(test.c_str(),"UDP")==0) {
					default_proto = UDP;
					printf("Using UDP\n");
				} else {
					goto usage;
				}
				break;
			// port
			case 'p':
				port = string(argv[++ind]);
				cout << "Listening on port " << port.c_str() << endl;
				break;
			// destination path
			case 'd':
				default_dest_path = string(argv[++ind]);
				cout << "Saving files in " << default_dest_path.c_str() << endl;
				break;
			default:
				goto usage;
				break;
		}

		ind++;
		//cout << ind << argv[ind] << endl;
		//cout << ind << argv[ind][1] << argv[ind++] << endl;
		//argv++;
		//argc--;
	}

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

	bzero(&servaddr, sizeof(servaddr));
	servaddr.sin_family = AF_INET;
	servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
	servaddr.sin_port = htons(str_to_int(port));

	bind(listenfd, (struct sockaddr *)&servaddr, sizeof(servaddr)); 
	if (errno) {
		printerrno("bind");
		return 1;
	}
	
	socket_options(listenfd);
	if (errno) {
		printerrno("socket_options");
		return 1;
	}

	if (default_proto != UDP) {
		listen(listenfd, 0);
		if (errno) {
			printerrno("listen");
			return 1;
		}

		cout << "Listen on port " << port.c_str() << endl;

		for (;;) {
			clilen = sizeof(cliaddr);
			if ((connfd = accept(listenfd,(struct sockaddr *)&cliaddr,
							&clilen)) <0) {
				if (errno == EINTR)
					continue;
				else
					printerrno("accept");
			}

			pthread_t rcvthread;
			pthread_create(&rcvthread, NULL, dostuff, (void *)&connfd);
			pthread_detach(rcvthread);

			if (errno)
				printerrno("close - postfork");
		}
		close(connfd);
	}
	else {
		cout << "Listen on port " << port.c_str() << endl;

		while(true) {
			pthread_t rcvthread;
			pthread_create(&rcvthread, NULL, dostuff, (void *)&listenfd);
			pthread_detach(rcvthread);
		}
		close(listenfd);
	}



	return 0;
usage:
	fprintf(stderr,"-P proto defines the protocol to use where proto\n");
	fprintf(stderr,"-p port defines the port to connect to\n");
	//fprintf(stderr,"can be TCP or DCCP\n");
	return 1;
}