// display.c
// Author: Josh Holtrop
// Date: 08/07/04
// Modified: 03/19/05

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

extern real_mode_param_t rm_params;	// check if a video mode is activated
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;
	int width = 80;
	int height = 25;
	int displayType = DISPLAY_CONSOLE;
	if (rm_params.vid_addr)				// framebuffer mode
	{
		vesafb_init(rm_params.width, rm_params.height, rm_params.bpp);
		width = vesafb_getWidth();
		height = vesafb_getHeight();
		displayType = DISPLAY_FB;
	}
	if (( vc = vconsole_new(width, height) ))
	{
		myDisplays[11].type = displayType;
		myDisplays[11].id = vc;
		display_activeConsole = vc;
	}
	else
		return -1;
	int i;
	for (i = 0; i < 6; i++)
	{
		if ((vc = vconsole_new(width, height)))
		{
			myDisplays[i].type = displayType;
			myDisplays[i].id = vc;
		}
		else
			return -2 - i;
	}
	return 0;
}


// activate the given display
int display_activate(u32_t id)
{
	if (id > 11)
		return -1;
	switch (myDisplays[id].type)
	{
		case DISPLAY_CONSOLE:
		case DISPLAY_FB:
			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, int buff_len)
{
	if (id == display_activeConsole)
	{
		int i;
		for (i = 0; i < 12; i++)
		{
			if (myDisplays[i].id == id)
			{
				if (myDisplays[i].type == DISPLAY_CONSOLE)
				{
					memcpyw((void *)CONSOLE_MEMORY, buffer, buff_len);
					writeCursorPosition(cursorPosition);
					return 0;
				}
				else if (myDisplays[i].type == DISPLAY_FB)
					return vesafb_draw(buffer, buff_len, cursorPosition);
				return -2;
			}
		}
	}
	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)
	{
		if (myDisplays[id].type == DISPLAY_CONSOLE)
			*(u16_t *)(CONSOLE_MEMORY + (position << 1)) = c;
		else if (myDisplays[id].type == DISPLAY_FB)
			vesafb_draw_char(position, 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)
	{
		if (myDisplays[id].type == DISPLAY_CONSOLE)
			writeCursorPosition(cursorPosition);
		else if (myDisplays[id].type == DISPLAY_FB)
			vesafb_update_cursor(cursorPosition);
		return 0;
	}
	return -1;
}