#include <dos.h>
#include <conio.h>
#include <bios.h>
#include <string.h>
#include <ctype.h>
#include "twindow.hpp"

const int MAXX=80;
const int MAXY=25;
const int MINX=0;
const int MINY=0;
class Display
{
	public:
		typedef unsigned far* ScreenPtr;
		static void drawChar(unsigned x,unsigned y, char c, unsigned fg, unsigned bg);
};
void Display::drawChar(unsigned x,unsigned y, char c, unsigned fg, unsigned bg)
{
	ScreenPtr display = (ScreenPtr)MK_FP(0xB800,0x0);
	display[y*80+x] = (((bg<<4)|fg)<<8)|(c & 255);
}
//=============================================================================
// default constructor: skapar fönstret med vissa koordinater och färger
//-----------------------------------------------------------------------------
TWindow::TWindow()
{
	Left=69;Right=78;Bottom=4;Top=1;background=BLUE;foreground=WHITE;
	text=NULL;
}
//=============================================================================
// constructor: skapar fönstret med vissa koordinater och färger
//-----------------------------------------------------------------------------
TWindow::TWindow(unsigned left,unsigned top,unsigned right ,unsigned bottom, DColor bg, DColor fg):
Left(left),Right(right),Bottom(bottom),Top(top),background(bg), foreground(fg)
{
	theState = 0;//FALSE;
	text=NULL;
}

//=============================================================================
// destructor: förstör fönstret
//-----------------------------------------------------------------------------
TWindow::~TWindow()
{
	if(isVisible())
		hide();
}

//=============================================================================
// hide: gömmer fönstret
//-----------------------------------------------------------------------------
void TWindow::hide()
{
	erase();
}
//=============================================================================
// show: visar fönstret
//-----------------------------------------------------------------------------
void TWindow::display()
{
	draw();
	if(text)
		showText();
}

//=============================================================================
// draw: ritar upp fönstret
//-----------------------------------------------------------------------------
void TWindow::draw()
{
	theState = 1;//;TRUE;
	for(int j= Top; j< Bottom; j++ )
		for(int i=Left; i< Right ; i++ )
		{
			Display::drawChar(i,j,' ',foreground,background);
		}
	drawBorder();
}

//=============================================================================
// erase: ritar över fönstret med svart
//-----------------------------------------------------------------------------
void TWindow::erase()
{
	for(int j= Top; j<= Bottom; j++ )
		for(int i=Left; i<= Right ; i++ )
			Display::drawChar(i,j,' ',BLACK,BLACK);
	theState = 0;//FALSE;
}

//=============================================================================
// drewBorder: ritar ramen runt fönstret
//-----------------------------------------------------------------------------
void TWindow::drawBorder()
{
	for(int i=Left+1; i< Right; i++)Display::drawChar(i	,Top		  , HLine		, foreground, background);
	for(    i=Left+1; i< Right; i++)Display::drawChar(i	,Bottom		, HLine		, foreground, background);
	for(    i=Top+1;  i< Bottom; i++)Display::drawChar(Left	,i		, VLine		, foreground, background);
	for(    i=Top+1;  i< Bottom; i++)Display::drawChar(Right	,i		, VLine		, foreground, background);
	Display::drawChar(Left	,Top		, LeftTop		, foreground, background);
	Display::drawChar(Right	,Top		,RightTop		, foreground, background);
	Display::drawChar(Right	,Bottom	,RightBottom, foreground, background);
	Display::drawChar(Left	,Bottom	, LeftBottom, foreground, background);
}
void TWindow::move(unsigned relX, unsigned relY)
{
	Left=Left+relX;
	Right=Right+relX;
	Top=Top+relY;
	Bottom=Bottom+relY;
}
void TWindow::moveAbs(unsigned x, unsigned y)
{
	unsigned width=Right-Left;
	unsigned height=Bottom-Top;
	Left=x;
	Right=x+width;
	Top=y;
	Bottom=y+height;
}

void TWindow::setText(char* txt)
{
	text=new char[strlen(txt)];
	strcpy(text, txt);
}
void TWindow::showText()
{
	int x=Left+1,y=Top+1;
	for(int i=0;i<strlen(text);i++)
	{
		Display::drawChar(x, y, text[i], foreground, background);
		if(++x>=Right)
		{
			x=Left+1;
			y++;
		}
	}
}
void TWindow::editText()
{
	int i=0;
	delete text;
	int size=(Right-Left-1)*(Bottom-Top-1);
	text=new char[size];
	text[0]='\0';
	char* buffer=new char[size];
	while(((buffer[i]=bioskey(0))!=ENTER)&&(i<size))
	{
		if(buffer[i]==BACK)
		{
			text[i-1]='\0';
			if(--i<0)i=0;
			draw();
			showText();
		}
		else if(buffer[i]==ESC)
		{
			delete text;
			text=NULL;
			draw();
			return;
		}
		else if(isalnum(buffer[i])||buffer[i]==' ')
		{
			text[i]=buffer[i];
			text[i+1]='\0';
			showText();
			i++;
		}
	}
}
TWindow& TWindow::operator=(TWindow& t)
{
	delete text;
	text=new char[strlen(t.text)];
	strcpy(text, t.text);
	return *this;
}
boolean TWindow::operator==(TWindow& t)
{
	return strcmp(t.text, text)==0;
}
boolean TWindow::operator<(TWindow& t)
{
	return strcmp(text, t.text)<0;
}
boolean TWindow::operator>(TWindow& t)
{
	return strcmp(text, t.text)>0;
}
ostream& operator<<(ostream& o, TWindow& t)
{
	t.display();
	return o;
}
istream& operator>>(istream&i, TWindow& t)
{
	t.editText();
	return i;
}