// display.c
// Author: Josh Holtrop
// Date: 08/07/04
// Modified: 08/21/04

#include "fs/devices.h"
#include "char/vconsole.h"
#include "display.h"
#include "lang/asmfuncs.h"

int display_activeConsole = -1;		// start with no active console
display_t myDisplays[12];		// f1-f12 change displays

// initialization routine for display subsystem
int display_init()
{
  minor_t vc;
  if ((vc = vconsole_new(80, 25)))
    {
      myDisplays[11].type = DISPLAY_CONSOLE;
      myDisplays[11].id = vc;
      display_activeConsole = vc;
    }
  int i;
  for (i = 0; i < 6; i++)
    {
      if ((vc = vconsole_new(80, 25)))
	{
	  myDisplays[i].type = DISPLAY_CONSOLE;
	  myDisplays[i].id = vc;
	}
    }
  return 0;
}


// activate the given display
int display_activate(u32_t id)
{
  if (id > 11)
    return -1;
  switch (myDisplays[id].type)
    {
    case DISPLAY_CONSOLE:
      display_activeConsole = myDisplays[id].id;
      return vconsole_draw(display_activeConsole);
    case DISPLAY_GRAPHICAL:
    default:
      return -2;
    }
}

// routine to refresh a console window
int display_console_draw(minor_t id, int cursorPosition, u16_t *buffer)
{
  if (id == display_activeConsole)
    {
      int i;
      for (i = 0; i < 12; i++)
	{
	  if (myDisplays[i].id == id)
	    {
	      memcpyw((void *)CONSOLE_MEMORY, buffer, 2000);
	      writeCursorPosition(cursorPosition);
	      return 0;
	    }
	}
    }
  return -1;
}


// write a character to the screen
int display_console_put_char(minor_t id, u16_t c, int position)
{
  if (id == display_activeConsole)
    {
      *(u16_t *)(CONSOLE_MEMORY + (position << 1)) = c;
      return 0;
    }
  return -1;
}


// move the cursor on the screen
int display_console_update_cursor(minor_t id, int cursorPosition)
{
  if (id == display_activeConsole)
    {
      writeCursorPosition(cursorPosition);
      return 0;
    }
  return -1;
}