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/*    (c) 2008 Jan Dlabal <dlabaljan@gmail.com>                               */
/*                                                                            */
/*     This file is part of FunghOS.                                          */
/*                                                                            */
/*     Funghos 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 3 of the License, or      */
/*     any later version.                                                     */
/*                                                                            */
/*     FunghOS 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 FunghOS. If not, see <http://www.gnu.org/licenses/>.        */
#include <system.h>
#include <stdio.h>
#include <screen/win.h>
#include <drivers/dvtab.h>

#define MOUSE_CHAR '+' // character displayed as the mouse pointer
#define MOUSE_FORC YELLOW // its (foreground) color
#define MOUSE_BACC BLACK // the background color
#define MOUSE_STEP 21

void ps2m_handler();
void ps2m_handle(unsigned char flags, char x, char y);
void ps2m_init(struct dvsw *x);
void ps2m_read();
void ps2m_wait(unsigned char a);

void swin();

unsigned char ps2m_bytes[3];
unsigned int ps2mx = 0;
unsigned int ps2my = 0;

void ps2m_install() {
  int (*dvproc[DV_SRV])(struct dvsw*,...);
  dvproc[Init]=ps2m_init;
  dvtab_add("ps2mouse",dvproc,12,12,&ps2m_handler,&ps2m_handler,TRUE);
}


void ps2m_handler(struct regs *r)
{
  static unsigned char cycle = 0;
  ps2m_bytes[cycle++] = inportb(0x60);
  if (cycle == 3) {
  	cycle = 0;
  	ps2m_handle(ps2m_bytes[0],ps2m_bytes[1],ps2m_bytes[2]);
  }
}


void ps2m_init(struct dvsw *x)
{
  unsigned char status_byte;
  ps2m_wait(1);
  outportb(0x64, 0xA8); /* enable the auxiliary mouse device */
  
  ps2m_wait(1);
  outportb(0x64,0x20);
  ps2m_wait(0);
  status_byte = (inportb(0x60) | 2);
  ps2m_wait(1);
  outportb(0x64, 0x60);
  ps2m_wait(1);
  outportb(0x60, status_byte);
  
  ps2m_wait(1);
  outportb(0x64,0xD4); /* tell the mouse we are sending a command */
  ps2m_wait(1);
  outportb(0x60,0xF6);
  ps2m_wait(0);
  inportb(0x60);
  
  ps2m_wait(1);
  outportb(0x64,0xD4); // tell the mouse we are sending a command
  ps2m_wait(1);
  outportb(0x60,0xF4);
  ps2m_wait(0);
  inportb(0x60);
}


void ps2m_wait(unsigned char a)
{
  unsigned int time_out = 100000;
  if (a==0)
  {
  	while (time_out--)
  	{
  	  if ((inportb(0x64) & 1)==1)
  	    return;
	}
	return;
  } else {
    while (time_out--)
  	{
  	  if ((inportb(0x64) & 2)==0)
  	    return;
	}
	return;  	
  }
}


void ps2m_handle(unsigned char flags, char x, char y)
{
  static int xx = 0,yy = 0;
  static int mouse_step = MOUSE_STEP; // should be user-configurable on run-time later
  unsigned short *txtptr;
  static unsigned short *last_txtptr = 0, last_value = 0;
  if (flags & 0x8)
  {
  if ((flags & 0x80) || (flags & 0x40))
    return; // 0x80 and 0x40 only show x and y overflows, do not care about them
  if (!(flags & 0x20))
    y |= 0xFFFFFF00; //delta-y is a negative value
  if (!(flags & 0x10))
    x |= 0xFFFFFF00; //delta-x is a negative value

  xx += x;
  yy += y;
  while ((xx > mouse_step) || (xx < -mouse_step))
  {
  	if (xx < 0)
  	{
  	  ps2mx -= 1;
  	  xx += mouse_step;
  	} else {
	  ps2mx += 1;
	  xx -= mouse_step;
	}
  }
  while ((yy > mouse_step) || (yy < -mouse_step))
  {
  	if (yy < 0)
  	{
  	  ps2my += 1;
  	  yy += mouse_step;
  	} else {
	  ps2my -= 1;
	  yy -= mouse_step;
	}
  }
  if (ps2my > 24) ps2my = 24; //checks for not overflowing the screen
  if (ps2my < 0) ps2my = 0;
  if (ps2mx > 79) ps2mx = 79;
  if (ps2mx < 0) ps2mx = 0;
  
  // bugfix for "overwriting" chars follows
  if ((*last_txtptr == (MOUSE_CHAR | (((MOUSE_BACC << 4) | (MOUSE_FORC & 0x0F)) << 8))) && (last_txtptr))
    *last_txtptr = last_value;
  last_txtptr = txtptr = ((unsigned short *)0xB8000) + (ps2my * 80) + ps2mx;
  last_value = (unsigned short) *txtptr;
  *txtptr = MOUSE_CHAR | (((MOUSE_BACC << 4) | (MOUSE_FORC & 0x0F)) << 8);
  
  if (flags & 0x4)
    ; //middle button is pressed
  if (flags & 0x2)
    ; //right button is pressed
  if (flags & 0x1)
    swin(); //left button is pressed
  
  } else {
  	//puts("[ps2] bad flags byte (0x8 is not set)\n");
  	//puts("[ps2] this is a bug. Please report it\n");
  	//while (1)
  	// ;
  }
}


void swin()
{
  struct win *window;
  window = first_window;
  while (window)
  {
  	if ((ps2my == window->y) && (ps2mx == (window->x2-1)))
  	{
	  rmwin(window);
	  return;
	} else {
  	  if ((ps2mx < (window->x2 + 1)) && (ps2mx > (window->x - 1)) && (ps2my < (window->y2 + 1)) && (ps2my > (window->y - 1)))
  	  {
  	    currwin = window;
  	    drwin(window);
  	    return;
	  }
    }
	window = window->next;
  }
}