/*
 * Copyright (c) 2006 Ondrej Palkovsky
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/** @defgroup egafb EGA framebuffer
 * @brief	HelenOS EGA framebuffer.
 * @ingroup fbs
 * @{
 */ 
/** @file
 */

#include <stdlib.h>
#include <unistd.h>
#include <align.h>
#include <async.h>
#include <ipc/ipc.h>
#include <errno.h>
#include <stdio.h>
#include <ddi.h>
#include <sysinfo.h>
#include <as.h>
#include <ipc/fb.h>
#include <ipc/ipc.h>
#include <ipc/ns.h>
#include <ipc/services.h>
#include <libarch/ddi.h>

#include "ega.h"
#include "../console/screenbuffer.h"
#include "main.h"

#define MAX_SAVED_SCREENS 256
typedef struct saved_screen {
	short *data;
} saved_screen;

saved_screen saved_screens[MAX_SAVED_SCREENS];

#define EGA_IO_ADDRESS 0x3d4
#define EGA_IO_SIZE 2

#define NORMAL_COLOR       0x0f
#define INVERTED_COLOR     0xf0

#define EGA_STYLE(fg,bg) ((fg) > (bg) ? NORMAL_COLOR : INVERTED_COLOR)

/* Allow only 1 connection */
static int client_connected = 0;

static unsigned int scr_width;
static unsigned int scr_height;
static char *scr_addr;

static unsigned int style = NORMAL_COLOR;

static void clrscr(void)
{
	int i;
	
	for (i = 0; i < scr_width * scr_height; i++) {
		scr_addr[i * 2] = ' ';
		scr_addr[i * 2 + 1] = style;
	}
}

static void cursor_goto(unsigned int row, unsigned int col)
{
	int ega_cursor;

	ega_cursor = col + scr_width * row;
	
	outb(EGA_IO_ADDRESS, 0xe);
	outb(EGA_IO_ADDRESS + 1, (ega_cursor >> 8) & 0xff);
	outb(EGA_IO_ADDRESS, 0xf);
	outb(EGA_IO_ADDRESS + 1, ega_cursor & 0xff);
}

static void cursor_disable(void)
{
	uint8_t stat;

	outb(EGA_IO_ADDRESS, 0xa);
	stat=inb(EGA_IO_ADDRESS + 1);
	outb(EGA_IO_ADDRESS, 0xa);
	outb(EGA_IO_ADDRESS + 1, stat | (1 << 5));
}

static void cursor_enable(void)
{
	uint8_t stat;

	outb(EGA_IO_ADDRESS, 0xa);
	stat=inb(EGA_IO_ADDRESS + 1);
	outb(EGA_IO_ADDRESS, 0xa);
	outb(EGA_IO_ADDRESS + 1, stat & (~(1 << 5)));
}

static void scroll(int rows)
{
	int i;
	if (rows > 0) {
		memcpy(scr_addr, ((char *) scr_addr) + rows * scr_width * 2,
		    scr_width * scr_height * 2 - rows * scr_width * 2);
		for (i = 0; i < rows * scr_width; i++)
			(((short *) scr_addr) + scr_width * scr_height - rows *
			    scr_width)[i] = ((style << 8) + ' ');
	} else if (rows < 0) {
		memcpy(((char *)scr_addr) - rows * scr_width * 2, scr_addr,
		    scr_width * scr_height * 2 + rows * scr_width * 2);
		for (i = 0; i < -rows * scr_width; i++)
			((short *)scr_addr)[i] = ((style << 8 ) + ' ');
	}
}

static void printchar(char c, unsigned int row, unsigned int col)
{
	scr_addr[(row * scr_width + col) * 2] = c;
	scr_addr[(row * scr_width + col) * 2 + 1] = style;
	
	cursor_goto(row, col + 1);
}

static void draw_text_data(keyfield_t *data)
{
	int i;

	for (i = 0; i < scr_width * scr_height; i++) {
		scr_addr[i * 2] = data[i].character;
		scr_addr[i * 2 + 1] = EGA_STYLE(data[i].style.fg_color,
		    data[i].style.bg_color);
	}
}

static int save_screen(void)
{
	int i;

	for (i = 0; (i < MAX_SAVED_SCREENS) && (saved_screens[i].data); i++)
		;
	if (i == MAX_SAVED_SCREENS) 
		return EINVAL;
	if (!(saved_screens[i].data = malloc(2 * scr_width * scr_height))) 
		return ENOMEM;
	memcpy(saved_screens[i].data, scr_addr, 2 * scr_width * scr_height);

	return i;
}

static int print_screen(int i)
{
	if (saved_screens[i].data)
		memcpy(scr_addr, saved_screens[i].data, 2 * scr_width *
		    scr_height);
	else
		return EINVAL;
	return i;
}


static void ega_client_connection(ipc_callid_t iid, ipc_call_t *icall)
{
	int retval;
	ipc_callid_t callid;
	ipc_call_t call;
	char c;
	unsigned int row, col;
	int bgcolor,fgcolor;
	keyfield_t *interbuf = NULL;
	size_t intersize = 0;
	int i;

	if (client_connected) {
		ipc_answer_0(iid, ELIMIT);
		return;
	}
	client_connected = 1;
	ipc_answer_0(iid, EOK); /* Accept connection */

	while (1) {
		callid = async_get_call(&call);
 		switch (IPC_GET_METHOD(call)) {
		case IPC_M_PHONE_HUNGUP:
			client_connected = 0;
			ipc_answer_0(callid, EOK);
			return; /* Exit thread */
		case IPC_M_SHARE_OUT:
			/* We accept one area for data interchange */
			intersize = IPC_GET_ARG2(call);
			if (intersize >= scr_width * scr_height *
			    sizeof(*interbuf)) {
				receive_comm_area(callid, &call,
				    (void *) &interbuf);
				continue;
			}
			retval = EINVAL;
			break;
		case FB_DRAW_TEXT_DATA:
			if (!interbuf) {
				retval = EINVAL;
				break;
			}
			draw_text_data(interbuf);
			retval = 0;
			break;
		case FB_GET_CSIZE:
			ipc_answer_2(callid, EOK, scr_height, scr_width);
			continue;
		case FB_CLEAR:
			clrscr();
			retval = 0;
			break;
		case FB_PUTCHAR:
			c = IPC_GET_ARG1(call);
			row = IPC_GET_ARG2(call);
			col = IPC_GET_ARG3(call);
			if (col >= scr_width || row >= scr_height) {
				retval = EINVAL;
				break;
			}
			printchar(c, row, col);
			retval = 0;
			break;
 		case FB_CURSOR_GOTO:
			row = IPC_GET_ARG1(call);
			col = IPC_GET_ARG2(call);
			if (row >= scr_height || col >= scr_width) {
				retval = EINVAL;
				break;
			}
			cursor_goto(row, col);
 			retval = 0;
 			break;
		case FB_SCROLL:
			i = IPC_GET_ARG1(call);
			if (i > scr_height || i < -((int) scr_height)) {
				retval = EINVAL;
				break;
			}
			scroll(i);
			retval = 0;
			break;
		case FB_CURSOR_VISIBILITY:
			if(IPC_GET_ARG1(call))
				cursor_enable();
			else
				cursor_disable();
			retval = 0;
			break;
		case FB_SET_STYLE:
			fgcolor = IPC_GET_ARG1(call);
			bgcolor = IPC_GET_ARG2(call);
			style = EGA_STYLE(fgcolor, bgcolor);
			retval = 0;
			break;
		case FB_VP_DRAW_PIXMAP:
			i = IPC_GET_ARG2(call);
			retval = print_screen(i);
			break;
		case FB_VP2PIXMAP:
			retval = save_screen();
			break;
		case FB_DROP_PIXMAP:
			i = IPC_GET_ARG1(call);
			if (i >= MAX_SAVED_SCREENS) {
				retval = EINVAL;
				break;
			}
			if (saved_screens[i].data) {
				free(saved_screens[i].data);
				saved_screens[i].data = NULL;
			}
			retval = 0;
			break;

		default:
			retval = ENOENT;
		}
		ipc_answer_0(callid, retval);
	}
}

int ega_init(void)
{
	void *ega_ph_addr;
	size_t sz;

	ega_ph_addr = (void *) sysinfo_value("fb.address.physical");
	scr_width = sysinfo_value("fb.width");
	scr_height = sysinfo_value("fb.height");
	iospace_enable(task_get_id(), (void *) EGA_IO_ADDRESS, 2);

	sz = scr_width * scr_height * 2;
	scr_addr = as_get_mappable_page(sz);

	physmem_map(ega_ph_addr, scr_addr, ALIGN_UP(sz, PAGE_SIZE) >>
	    PAGE_WIDTH, AS_AREA_READ | AS_AREA_WRITE);

	async_set_client_connection(ega_client_connection);

	return 0;
}


/** 
 * @}
 */