/***
*
*	Copyright (c) 1996-2002, Valve LLC. All rights reserved.
*	
*	This product contains software technology licensed from Id 
*	Software, Inc. ("Id Technology").  Id Technology (c) 1996 Id Software, Inc. 
*	All Rights Reserved.
*
*   Use, distribution, and modification of this source code and/or resulting
*   object code is restricted to non-commercial enhancements to products from
*   Valve LLC.  All other use, distribution, or modification is prohibited
*   without written permission from Valve LLC.
*
****/
//
// saytext.cpp
//
// implementation of CHudSayText class
//

#include "hud.h"
#include "cl_util.h"
#include "parsemsg.h"

#include <string.h>
#include <stdio.h>

extern float *GetClientColor( int clientIndex );

#define MAX_LINES	5
#define MAX_CHARS_PER_LINE	256  /* it can be less than this, depending on char size */

// allow 20 pixels on either side of the text
#define MAX_LINE_WIDTH  ( ScreenWidth - 40 )
#define LINE_START  10
static float SCROLL_SPEED = 5;

static char g_szLineBuffer[MAX_LINES + 1][MAX_CHARS_PER_LINE];
static float *g_pflNameColors[MAX_LINES + 1];
static int g_iNameLengths[MAX_LINES + 1];
static float flScrollTime = 0;  // the time at which the lines next scroll up

static int Y_START = 0;
static int line_height = 0;

DECLARE_MESSAGE( m_SayText, SayText )

int CHudSayText::Init( void )
{
	gHUD.AddHudElem( this );

	HOOK_MESSAGE( SayText );

	InitHUDData();

	m_HUD_saytext =		gEngfuncs.pfnRegisterVariable( "hud_saytext", "1", 0 );
	m_HUD_saytext_time =	gEngfuncs.pfnRegisterVariable( "hud_saytext_time", "5", 0 );

	m_iFlags |= HUD_INTERMISSION; // is always drawn during an intermission

	return 1;
}

void CHudSayText::InitHUDData( void )
{
	memset( g_szLineBuffer, 0, sizeof g_szLineBuffer );
	memset( g_pflNameColors, 0, sizeof g_pflNameColors );
	memset( g_iNameLengths, 0, sizeof g_iNameLengths );
}

int CHudSayText::VidInit( void )
{
	return 1;
}

int ScrollTextUp( void )
{
	ConsolePrint( g_szLineBuffer[0] ); // move the first line into the console buffer
	g_szLineBuffer[MAX_LINES][0] = 0;
	memmove( g_szLineBuffer[0], g_szLineBuffer[1], sizeof(g_szLineBuffer) - sizeof(g_szLineBuffer[0]) ); // overwrite the first line
	memmove( &g_pflNameColors[0], &g_pflNameColors[1], sizeof(g_pflNameColors) - sizeof(g_pflNameColors[0]) );
	memmove( &g_iNameLengths[0], &g_iNameLengths[1], sizeof(g_iNameLengths) - sizeof(g_iNameLengths[0]) );
	g_szLineBuffer[MAX_LINES-1][0] = 0;

	if( g_szLineBuffer[0][0] == ' ' ) // also scroll up following lines
	{
		g_szLineBuffer[0][0] = 2;
		return 1 + ScrollTextUp();
	}

	return 1;
}

int CHudSayText::Draw( float flTime )
{
	int y = Y_START;

	// make sure the scrolltime is within reasonable bounds,  to guard against the clock being reset
	flScrollTime = min( flScrollTime, flTime + m_HUD_saytext_time->value );

	if( flScrollTime <= flTime )
	{
		if( *g_szLineBuffer[0] )
		{
			flScrollTime = flTime + m_HUD_saytext_time->value;
			// push the console up
			ScrollTextUp();
		}
		else
		{
			// buffer is empty,  just disable drawing of this section
			m_iFlags &= ~HUD_ACTIVE;
		}
	}

	for( int i = 0; i < MAX_LINES; i++ )
	{
		if( *g_szLineBuffer[i] )
		{
			if( *g_szLineBuffer[i] == 2 && g_pflNameColors[i] )
			{
				// it's a saytext string
				static char buf[MAX_PLAYER_NAME_LENGTH + 32];

				// draw the first x characters in the player color
				strncpy( buf, g_szLineBuffer[i], min(g_iNameLengths[i], MAX_PLAYER_NAME_LENGTH + 32 ) );
				buf[min( g_iNameLengths[i], MAX_PLAYER_NAME_LENGTH + 31 )] = 0;
				DrawSetTextColor( g_pflNameColors[i][0], g_pflNameColors[i][1], g_pflNameColors[i][2] );
				int x = DrawConsoleString( LINE_START, y, buf );

				// color is reset after each string draw
				DrawConsoleString( x, y, g_szLineBuffer[i] + g_iNameLengths[i] );
			}
			else
			{
				// normal draw
				DrawConsoleString( LINE_START, y, g_szLineBuffer[i] );
			}
		}

		y += line_height;
	}

	return 1;
}

int CHudSayText::MsgFunc_SayText( const char *pszName, int iSize, void *pbuf )
{
	BEGIN_READ( pbuf, iSize );

	int client_index = READ_BYTE();		// the client who spoke the message
	SayTextPrint( READ_STRING(), iSize - 1,  client_index );

	return 1;
}

void CHudSayText::SayTextPrint( const char *pszBuf, int iBufSize, int clientIndex )
{
	int i;
	ConsolePrint( pszBuf );

	// find an empty string slot
	for( i = 0; i < MAX_LINES; i++ )
	{
		if( !( *g_szLineBuffer[i] ) )
			break;
	}
	if( i == MAX_LINES )
	{
		// force scroll buffer up
		ScrollTextUp();
		i = MAX_LINES - 1;
	}

	g_iNameLengths[i] = 0;
	g_pflNameColors[i] = NULL;

	// if it's a say message, search for the players name in the string
	if( *pszBuf == 2 && clientIndex > 0 )
	{
		GetPlayerInfo( clientIndex, &g_PlayerInfoList[clientIndex] );
		const char *pName = g_PlayerInfoList[clientIndex].name;

		if( pName )
		{
			const char *nameInString = strstr( pszBuf, pName );

			if( nameInString )
			{
				g_iNameLengths[i] = strlen( pName ) + ( nameInString - pszBuf );
				g_pflNameColors[i] = GetClientColor( clientIndex );
			}
		}
	}

	strncpy( g_szLineBuffer[i], pszBuf, max( iBufSize - 1, MAX_CHARS_PER_LINE - 1 ) );

	// make sure the text fits in one line
	EnsureTextFitsInOneLineAndWrapIfHaveTo( i );

	// Set scroll time
	if( i == 0 )
	{
		flScrollTime = gHUD.m_flTime + m_HUD_saytext_time->value;
	}

	m_iFlags |= HUD_ACTIVE;
	PlaySound( "misc/talk.wav", 1 );

	if( ScreenHeight >= 480 )
		Y_START = ScreenHeight - 60;
	else
		Y_START = ScreenHeight - 45;
	Y_START -= ( line_height * ( MAX_LINES + 1 ) );
}

void CHudSayText::EnsureTextFitsInOneLineAndWrapIfHaveTo( int line )
{
	int line_width = 0;
	GetConsoleStringSize( g_szLineBuffer[line], &line_width, &line_height );

	if( ( line_width + LINE_START ) > MAX_LINE_WIDTH )
	{
		// string is too long to fit on line
		// scan the string until we find what word is too long,  and wrap the end of the sentence after the word
		int length = LINE_START;
		int tmp_len = 0;
		char *last_break = NULL;
		for( char *x = g_szLineBuffer[line]; *x != 0; x++ )
		{
			// check for a color change, if so skip past it
			if( x[0] == '/' && x[1] == '(' )
			{
				x += 2;
				// skip forward until past mode specifier
				while ( *x != 0 && *x != ')' )
					x++;

				if( *x != 0 )
					x++;

				if( *x == 0 )
					break;
			}

			char buf[2];
			buf[1] = 0;

			if( *x == ' ' && x != g_szLineBuffer[line] )  // store each line break,  except for the very first character
				last_break = x;

			buf[0] = *x;  // get the length of the current character
			GetConsoleStringSize( buf, &tmp_len, &line_height );
			length += tmp_len;

			if( length > MAX_LINE_WIDTH )
			{
				// needs to be broken up
				if( !last_break )
					last_break = x - 1;

				x = last_break;

				// find an empty string slot
				int j;
				do 
				{
					for( j = 0; j < MAX_LINES; j++ )
					{
						if( !( *g_szLineBuffer[j] ) )
							break;
					}
					if( j == MAX_LINES )
					{
						// need to make more room to display text, scroll stuff up then fix the pointers
						int linesmoved = ScrollTextUp();
						line -= linesmoved;
						last_break = last_break - ( sizeof(g_szLineBuffer[0]) * linesmoved );
					}
				}
				while( j == MAX_LINES );

				// copy remaining string into next buffer,  making sure it starts with a space character
				if( (char)*last_break == (char)' ' )
				{
					int linelen = strlen( g_szLineBuffer[j] );
					int remaininglen = strlen( last_break );

					if( ( linelen - remaininglen ) <= MAX_CHARS_PER_LINE )
						strcat( g_szLineBuffer[j], last_break );
				}
				else
				{
					if ( ( strlen( g_szLineBuffer[j] ) - strlen( last_break ) - 2 ) < MAX_CHARS_PER_LINE )
					{
						strcat( g_szLineBuffer[j], " " );
						strcat( g_szLineBuffer[j], last_break );
					}
				}

				*last_break = 0; // cut off the last string

				EnsureTextFitsInOneLineAndWrapIfHaveTo( j );
				break;
			}
		}
	}
}