// console.c
// Author: Josh Holtrop
// Date: 08/07/04
// Modified: 08/16/04

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

int activeConsole;
int numConsoles;

// initialization routine for console subsystem
int console_init(int num)
{
	int i;
	activeConsole = 0;
	for (i = 0; i < num; i++)
	{
		minor_t vc = vconsole_new(80, 25);
		if (vc)
		{
			numConsoles++;
			if (!activeConsole)
				activeConsole = vc;
		}
	}
	if (numConsoles)
		return 0;
	return -1;
}


// activate a virtual console
int console_activate(minor_t id)
{
	if (id > 0 && id <= numConsoles)
	{
		activeConsole = id;
		return vconsole_draw(id);
	}
	return -1;
}

// routine to refresh a console window
int console_draw(minor_t id, int cursorPosition, u16_t *buffer)
{
	if (id == activeConsole)
	{
		memcpyw((void *)CONSOLE_MEMORY, buffer, 2000);
		writeCursorPosition(cursorPosition);
		return 0;
	}
	return -1;
}


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


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