/* 
 *  Ths code in this file is part of tcptrack. For more information see
 *    http://www.rhythm.cx/~steve/devel/tcptrack
 *
 *     Copyright (C) Steve Benson - 2003
 *
 *  tcptrack 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, or (at your
 *  option) any later version.
 *   
 *  tcptrack 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 GNU Make; see the file COPYING.  If not, write to
 *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. 
 *  
 */
#include "TextUI.h"
#include <stdio.h>
#include <assert.h>
#include <stdlib.h>
#include <signal.h>
#include <iostream>
#include "util.h"
#include "defs.h"
#include "IPv4Address.h"
#include "TCPTrack.h"
#include "GenericError.h"

extern TCPTrack *app; 

TextUI::TextUI( TCContainer *c )
{
	container = c;
	iter=NULL;

	doffset=0;
	
	state=USTATE_IDLE;

	paused=false;
	sorted=true;

	pthread_mutex_init( &state_mutex, NULL );
}

void TextUI::init()
{
	//
	// Initialize ncurses.
	// TODO: make these exceptions more specific & meaningful.
	//

	WINDOW *w=initscr();
	if( w==NULL )
		throw GenericError("Unable to initialize ncurses display: initscr returned NULL.");

	keypad(w,TRUE);
	int x,y;
	getmaxyx(w,y,x); // this is an ncurses macro

	if( x<80 ) 
		throw GenericError("tcptrack requires a screen at least 80 columns wide to run.");
	
	if( y<3 )
		throw GenericError("tcptrack requires a screen at least 3 rows tall to run.");

	size_x=x;
	size_y=y;
	bottom=y;
	
	
	// 
	// Set up and run the displayer thread.
	//
	
	run_displayer = true;

	pthread_attr_t attr;
	if( pthread_attr_init( &attr ) != 0 )
		throw GenericError("pthread_attr_init() failed");

	pthread_attr_setstacksize( &attr, SS_TUI );

	if( pthread_create(&displayer_tid,&attr,displayer_thread_func,this) != 0 )
		throw GenericError("pthread_create() returned an error.");


	state=USTATE_RUNNING;
}

void TextUI::stop()
{
	pthread_mutex_lock(&state_mutex);
	if( state != USTATE_RUNNING ) 
	{
		pthread_mutex_unlock(&state_mutex);
		return;
	}
	state=USTATE_STOPPING;
	pthread_mutex_unlock(&state_mutex);	
	
	// now that state is set to USTATE_STOPPING, 
	// the display draw loop will see this and exit. just wait for it.
	pthread_join(displayer_tid,NULL);
	
	state=USTATE_DONE;
	
}

TextUI::~TextUI()
{
	stop();
}

// main drawer thread loop
void TextUI::displayer_run()
{
	// redraw the display this freqently...
	struct timespec t;
	t.tv_sec=0;
	t.tv_nsec=DISPLAY_REFRESH;

	// used for select(), to grab keyboard input when there is some.
	fd_set fdset;
	struct timeval tv;
	int rv;

	iter=container->getSortedIteratorPtr();

	while( state==USTATE_RUNNING || state==USTATE_IDLE )
	{
		FD_ZERO(&fdset);
		FD_SET(0,&fdset);
		tv.tv_sec=0;
		tv.tv_usec=100;

		rv=select(1,&fdset,NULL,NULL,&tv);
		if( rv )
		{
			int c = getch();
			if( c==KEY_DOWN ) 
			{
				++doffset;
				// this is checked for sanity later
			}
			else if( c==KEY_UP ) 
			{
				if( doffset>0 )
					--doffset;
			}
			else if( c=='q' )
			{
				app->shutdown();
			}
			else if( c=='s' )
				sorted=!sorted;
			else if( c=='p' )
			{
				if( paused==true ) 
				{
					// going from paused to unpaused
					paused=false;
					container->purge(true);
				}
				else
				{
					// going from unpaused to paused
					paused=true;
					container->purge(false);
				}
			}
		}


		container->lock();

		// check the offset into the container for sanity.
		if( doffset>0 )
			if( container->numConnections()>0 )
			{
				if( doffset >= container->numConnections() ) 
					doffset = container->numConnections()-1;
			}
			else
				doffset=0;
			
		// if we aren't reusing an old iterator (ie, if unpaused),
		// get a fresh one.		
		if( iter==NULL )
			iter=container->getSortedIteratorPtr();
		
		drawui();

		if( paused==false )
		{
			// gonna get a new one next time if not paused... 
			// so can this one.
			delete iter;
			iter=NULL;
		}

		container->unlock();


	}
	endwin();
}

void TextUI::drawui()
{
	int row=1;
	
	erase();

	attron(A_REVERSE);
	move(0,0);
	printw("                                                                               ");

	move(0,1);
	printw("Client");
	move(0,23);
	printw("Server");
	move(0,45);
	printw("State");
	move(0,58);
	printw("Idle");
	move(0,63);
	printw("A");
	move(0,65);
	printw("Speed");

	attroff(A_REVERSE);



	move(1,0);

	SortedIterator * i=iter;

	i->rewind();

	int Bps_total=0; // the total speed
	while( TCPConnection *ic=i->getNext() )
		Bps_total+=ic->getPayloadBytesPerSecond();		

	i->rewind();
	
	if( sorted ) 
		i->sort();

	int ic_i=0; // for scrolling
	while( TCPConnection *ic=i->getNext() )
	{
		
		if( row == size_y-2 )
			break;

		++ic_i;
		if( ic_i <= doffset )
			continue;

		
		if( paused==false &&  (ic->getState() == TCP_STATE_CLOSED || ic->getState() == TCP_STATE_RESET)
		   && time(NULL) - ic->getLastPktTimestamp() > app->remto )
		{
			continue;
		}
		
		move(row,1);
		printw("%s:%d", ic->srcAddr().ptr(), ic->srcPort() );
		move(row,23);
		printw("%s:%d", ic->dstAddr().ptr(), ic->dstPort());

		move(row,45);
		printw("             ");
		move(row,45);
		if( ic->getState() == TCP_STATE_SYN_SYNACK )
			printw("SYN_SENT");
		else if( ic->getState() == TCP_STATE_SYNACK_ACK )
			printw("SYN|ACK-ACK");
		else if( ic->getState() == TCP_STATE_UP )
			printw("ESTABLISHED");
		else if( ic->getState() == TCP_STATE_FIN_FINACK )
			printw("CLOSING");
		else if( ic->getState() == TCP_STATE_CLOSED )
			printw("CLOSED");
		else if( ic->getState() == TCP_STATE_RESET )
			printw("RESET");
		
		move(row,58);
		if( ic->getIdleSeconds() < 60 )
			printw("%ds",ic->getIdleSeconds());
		else if( ic->getIdleSeconds() > 59 ) 
			printw("%dm",ic->getIdleSeconds()/60);
		else if( ic->getIdleSeconds() > 3559 )
			printw("%dh",ic->getIdleSeconds()/3600);
			
		move(row,63);
		if( ic->activityToggle() )
			printw("*");
		else
			printw(" ");

		move(row,65);
		unsigned int Bps = ic->getPayloadBytesPerSecond();
		print_bps(Bps);
			
		row++;
	}
	
	attron(A_REVERSE);

	move(bottom-2,0);
	printw("                                                                               ");
	move(bottom-2,1);
	printw("TOTAL");
	move(bottom-2,65);
	print_bps(Bps_total);
	
	move(bottom-1,0);
	printw("                                                                               ");

	move(bottom-1,1);
	if( container->numConnections() > 0 )
		printw("Connections %d-%d of %d",doffset+1,ic_i,container->numConnections());
	else 
		printw("Connections 0-0 of 0");
		
	move(bottom-1,56);
	if( paused==true )
	{
		attron(A_UNDERLINE);
		printw("P");
		attroff(A_UNDERLINE);
		printw("aused");
	}
	else
	{
		printw("Un");
		attron(A_UNDERLINE);
		printw("p");
		attroff(A_UNDERLINE);
		printw("aused");
	}


	move(bottom-1,66);
	if( sorted==false ) 
	{
		printw("Un");
		attron(A_UNDERLINE);
		printw("s");
		attroff(A_UNDERLINE);
		printw("orted");
	}
	else
	{
		attron(A_UNDERLINE);
		printw("S");
		attroff(A_UNDERLINE);
		printw("orted");
	}

	attroff(A_REVERSE);
	refresh();
}

// display the speed with the right format
void TextUI::print_bps(int Bps)
{
	if( Bps < 1024 )
		printw("%d B/s",Bps);
	if( Bps >= 1024 && Bps < 1024*1024 )
		printw("%d KB/s",Bps/1024);
	if( Bps >= 1024*1024 && Bps <= 99999999 )
		printw("%d MB/s",Bps/(1024*1024));
	if( Bps > 99999999 ) // not enough room to display it
		printw("LUDICROUS"); // LUDICROUS SPEED!!
}

// reset the terminal. used only for unclean exits.
void TextUI::reset()
{
	endwin();
}

/////////

void *displayer_thread_func( void *arg )
{
	TextUI *ui = (TextUI *) arg;
	ui->displayer_run();
	return NULL;
}