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/*

 * Copyright (C) 2006 Josef Cejka

 * 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.

 */

#include <kbd.h>

#include <fb.h>

#include <ipc/ipc.h>

#include <ipc/fb.h>

#include <ipc/services.h>

#include <errno.h>

#include <key_buffer.h>

#include <console.h>

#include <unistd.h>

#include <async.h>

#include <libadt/fifo.h>

#include <screenbuffer.h>

#include <sys/mman.h>

#include "gcons.h"

#define MAX_KEYREQUESTS_BUFFERED 32

#define NAME "CONSOLE"

/** Index of currently used virtual console.

 */

int active_console = 0;

/** Information about framebuffer

 */

struct {

	int phone;		/**< Framebuffer phone */

	ipcarg_t rows;		/**< Framebuffer rows */

	ipcarg_t cols;		/**< Framebuffer columns */

} fb_info;

typedef struct {

	keybuffer_t keybuffer;		/**< Buffer for incoming keys. */

	FIFO_CREATE_STATIC(keyrequests, ipc_callid_t , MAX_KEYREQUESTS_BUFFERED);	/**< Buffer for unsatisfied request for keys. */

	int keyrequest_counter;		/**< Number of requests in buffer. */

	int client_phone;		/**< Phone to connected client. */

	int used;			/**< 1 if this virtual console is connected to some client.*/

	screenbuffer_t screenbuffer;	/**< Screenbuffer for saving screen contents and related settings. */

} connection_t;

static connection_t connections[CONSOLE_COUNT];	/**< Array of data for virtual consoles */

static keyfield_t *interbuffer = NULL;			/**< Pointer to memory shared with framebufer used for faster virt. console switching */

static int kernel_pixmap = -1;      /**< Number of fb pixmap, where kernel console is stored */

/** Find unused virtual console.

 *

 */

static int find_free_connection() 

{

	int i = 0;

	while (i < CONSOLE_COUNT) {

		if (connections[i].used == 0)

			return i;

		++i;

	}

	return CONSOLE_COUNT;

}

/** Find index of virtual console used by client with given phone.

 *

 */

static int find_connection(int client_phone) 

{

	int i = 0;

	while (i < CONSOLE_COUNT) {

		if (connections[i].client_phone == client_phone)

			return i;

		++i;

	}

	return  CONSOLE_COUNT;

}

static void clrscr(void)

{

	nsend_call(fb_info.phone, FB_CLEAR, 0);

}

static void curs_visibility(int v)

{

	send_call(fb_info.phone, FB_CURSOR_VISIBILITY, v); 

}

static void curs_goto(int row, int col)

{

	nsend_call_2(fb_info.phone, FB_CURSOR_GOTO, row, col); 

}

static void set_style(style_t *style)

{

	nsend_call_2(fb_info.phone, FB_SET_STYLE, style->fg_color, style->bg_color); 

}

static void set_style_col(int fgcolor, int bgcolor)

{

	nsend_call_2(fb_info.phone, FB_SET_STYLE, fgcolor, bgcolor); 

}

static void prtchr(char c, int row, int col)

{

	nsend_call_3(fb_info.phone, FB_PUTCHAR, c, row, col);

}

/** Check key and process special keys. 

 *

 * */

static void write_char(int console, char key)

{

	screenbuffer_t *scr = &(connections[console].screenbuffer);

	switch (key) {

		case '\n':

			scr->position_y += 1;

			scr->position_x =  0;

			break;

		case '\r':

			break;

		case '\t':

			scr->position_x += 8;

			scr->position_x -= scr->position_x % 8; 

			break;

		case '\b':

			if (scr->position_x == 0) 

				break;

			scr->position_x--;

			if (console == active_console)

				prtchr(' ', scr->position_y, scr->position_x);

			screenbuffer_putchar(scr, ' ');

			break;

		default:	

			if (console == active_console)

				prtchr(key, scr->position_y, scr->position_x);

			screenbuffer_putchar(scr, key);

			scr->position_x++;

	}

	scr->position_y += (scr->position_x >= scr->size_x);

	if (scr->position_y >= scr->size_y) {

		scr->position_y = scr->size_y - 1;

		screenbuffer_clear_line(scr, scr->top_line++);

		if (console == active_console)

			nsend_call(fb_info.phone, FB_SCROLL, 1);

	}

	scr->position_x = scr->position_x % scr->size_x;

	if (console == active_console)

		curs_goto(scr->position_y, scr->position_x);

}

/** Save current screen to pixmap, draw old pixmap

 *

 * @param oldpixmap Old pixmap

 * @return ID of pixmap of current screen

 */

static int switch_screens(int oldpixmap)

{

	int newpmap;

	/* Save screen */

	newpmap = sync_send(fb_info.phone, FB_VP2PIXMAP, 0, NULL);

	if (newpmap < 0)

		return -1;

	if (oldpixmap != -1) {

		/* Show old screen */

		nsend_call_2(fb_info.phone, FB_VP_DRAW_PIXMAP, 0, oldpixmap);

		/* Drop old pixmap */

		nsend_call(fb_info.phone, FB_DROP_PIXMAP, oldpixmap);

	}

	return newpmap;

}

/** Switch to new console */

static void change_console(int newcons)

{

	connection_t *conn;

	static int console_pixmap = -1;

	int i, j;

	char c;

	if (newcons == active_console)

		return;

	if (newcons == KERNEL_CONSOLE) {

		if (active_console == KERNEL_CONSOLE)

			return;

		active_console = KERNEL_CONSOLE;

		curs_visibility(0);

		if (kernel_pixmap == -1) { 

			/* store/restore unsupported */

			set_style_col(DEFAULT_FOREGROUND, DEFAULT_BACKGROUND);

			clrscr();

		} else {

			gcons_in_kernel();

			console_pixmap = switch_screens(kernel_pixmap);

			kernel_pixmap = -1;

		}

		__SYSCALL0(SYS_DEBUG_ENABLE_CONSOLE);

		return;

	} 

	if (console_pixmap != -1) {

		kernel_pixmap = switch_screens(console_pixmap);

		console_pixmap = -1;

	}

	active_console = newcons;

	gcons_change_console(newcons);

	conn = &connections[active_console];

	set_style(&conn->screenbuffer.style);

	curs_goto(conn->screenbuffer.position_y, conn->screenbuffer.position_x);

	if (interbuffer) {

		for (i = 0; i < conn->screenbuffer.size_x; i++)

			for (j = 0; j < conn->screenbuffer.size_y; j++) 

				interbuffer[i + j*conn->screenbuffer.size_x] = *get_field_at(&(conn->screenbuffer),i, j);

		/* This call can preempt, but we are already at the end */

		sync_send_2(fb_info.phone, FB_DRAW_TEXT_DATA, 0, 0, NULL, NULL);		

		curs_visibility(1);

	} else {

		curs_visibility(0);

		clrscr();

		for (i = 0; i < conn->screenbuffer.size_x; i++)

			for (j = 0; j < conn->screenbuffer.size_y; j++) {

				c = get_field_at(&(conn->screenbuffer),i, j)->character;

				if (c && c != ' ')

					prtchr(c, j, i);

			}

		curs_visibility(1);

	}

}

/** Handler for keyboard */

static void keyboard_events(ipc_callid_t iid, ipc_call_t *icall)

{

	ipc_callid_t callid;

	ipc_call_t call;

	int retval;

	int c;

	connection_t *conn;

	/* Ignore parameters, the connection is alread opened */

	while (1) {

		callid = async_get_call(&call);

		switch (IPC_GET_METHOD(call)) {

		case IPC_M_PHONE_HUNGUP:

			ipc_answer_fast(callid,0,0,0);

			/* TODO: Handle hangup */

			return;

		case KBD_PUSHCHAR:

			/* got key from keyboard driver */

			retval = 0;

			c = IPC_GET_ARG1(call);

			/* switch to another virtual console */

			conn = &connections[active_console];

//			if ((c >= KBD_KEY_F1) && (c < KBD_KEY_F1 + CONSOLE_COUNT)) {

			if ((c >= 0x101) && (c < 0x101 + CONSOLE_COUNT)) {

				if (c == 0x112)

					change_console(KERNEL_CONSOLE);

				else

					change_console(c - 0x101);

				break;

			}

			/* if client is awaiting key, send it */

			if (conn->keyrequest_counter > 0) {		

				conn->keyrequest_counter--;

				ipc_answer_fast(fifo_pop(conn->keyrequests), 0, c, 0);

				break;

			}

			/*FIXME: else store key to its buffer */

			keybuffer_push(&conn->keybuffer, c);

			break;

		default:

			retval = ENOENT;

		}		

		ipc_answer_fast(callid, retval, 0, 0);

	}

}

/** Default thread for new connections */

static void client_connection(ipc_callid_t iid, ipc_call_t *icall)

{

	ipc_callid_t callid;

	ipc_call_t call;

	int consnum;

	ipcarg_t arg1, arg2;

	if ((consnum = find_free_connection()) == CONSOLE_COUNT) {

		ipc_answer_fast(iid,ELIMIT,0,0);

		return;

	}

	gcons_notify_connect(consnum);

	connections[consnum].used = 1;

	connections[consnum].client_phone = IPC_GET_ARG3(call);

	screenbuffer_clear(&(connections[consnum].screenbuffer));

	/* Accept the connection */

	ipc_answer_fast(iid,0,0,0);

	while (1) {

		callid = async_get_call(&call);

		arg1 = arg2 = 0;

		switch (IPC_GET_METHOD(call)) {

		case IPC_M_PHONE_HUNGUP:

			/* TODO */

			ipc_answer_fast(callid, 0,0,0);

			return;

		case CONSOLE_PUTCHAR:

			write_char(consnum, IPC_GET_ARG1(call));

			gcons_notify_char(consnum);

			break;

		case CONSOLE_CLEAR:

			/* Send message to fb */

			if (consnum == active_console) {

				send_call(fb_info.phone, FB_CLEAR, 0); 

			}

			screenbuffer_clear(&(connections[consnum].screenbuffer));

			break;

		case CONSOLE_GOTO:

			screenbuffer_goto(&(connections[consnum].screenbuffer), IPC_GET_ARG2(call), IPC_GET_ARG1(call));

			if (consnum == active_console)

				curs_goto(IPC_GET_ARG1(call),IPC_GET_ARG2(call));

			break;

		case CONSOLE_GETSIZE:

			arg1 = fb_info.rows;

			arg2 = fb_info.cols;

			break;

		case CONSOLE_FLUSH:

			sync_send_2(fb_info.phone, FB_FLUSH, 0, 0, NULL, NULL);		

			break;

		case CONSOLE_SET_STYLE:

			arg1 = IPC_GET_ARG1(call);

			arg2 = IPC_GET_ARG2(call);

			screenbuffer_set_style(&(connections[consnum].screenbuffer),arg1, arg2);

			if (consnum == active_console)

				set_style_col(arg1, arg2);

			break;

		case CONSOLE_GETCHAR:

			if (keybuffer_empty(&(connections[consnum].keybuffer))) {

				/* buffer is empty -> store request */

				if (connections[consnum].keyrequest_counter < MAX_KEYREQUESTS_BUFFERED) {		

					fifo_push(connections[consnum].keyrequests, callid);

					connections[consnum].keyrequest_counter++;

				} else {

					/* no key available and too many requests => fail */

					ipc_answer_fast(callid, ELIMIT, 0, 0);

				}

				continue;

			};

			keybuffer_pop(&(connections[consnum].keybuffer), (char *)&arg1);

			break;

		}

		ipc_answer_fast(callid, 0, arg1, arg2);

	}

}

int main(int argc, char *argv[])

{

	ipcarg_t phonehash;

	int kbd_phone, fb_phone;

	ipcarg_t retval, arg1 = 0xdead, arg2 = 0xbeef;

	int i;

	async_set_client_connection(client_connection);

	/* Connect to keyboard driver */

	while ((kbd_phone = ipc_connect_me_to(PHONE_NS, SERVICE_KEYBOARD, 0)) < 0) {

		usleep(10000);

	};

	if (ipc_connect_to_me(kbd_phone, SERVICE_CONSOLE, 0, &phonehash) != 0) {

		return -1;

	};

	/* Connect to framebuffer driver */

	while ((fb_info.phone = ipc_connect_me_to(PHONE_NS, SERVICE_VIDEO, 0)) < 0) {

		usleep(10000);

	}

	/* Save old kernel screen */

	kernel_pixmap = switch_screens(-1);

	/* Initialize gcons */

	gcons_init(fb_info.phone);

	/* Synchronize, the gcons can have something in queue */

	sync_send_2(fb_info.phone, FB_GET_CSIZE, 0, 0, NULL, NULL);

	ipc_call_sync_2(fb_info.phone, FB_GET_CSIZE, 0, 0, &(fb_info.rows), &(fb_info.cols)); 

	set_style_col(DEFAULT_FOREGROUND, DEFAULT_BACKGROUND);

	clrscr();

	/* Init virtual consoles */

	for (i = 0; i < CONSOLE_COUNT; i++) {

		connections[i].used = 0;

		keybuffer_init(&(connections[i].keybuffer));

		connections[i].keyrequests.head = connections[i].keyrequests.tail = 0;

		connections[i].keyrequests.items = MAX_KEYREQUESTS_BUFFERED;

		connections[i].keyrequest_counter = 0;

		if (screenbuffer_init(&(connections[i].screenbuffer), fb_info.cols, fb_info.rows ) == NULL) {

			/*FIXME: handle error */

			return -1;

		}

	}

	if ((interbuffer = mmap(NULL, sizeof(keyfield_t) * fb_info.cols * fb_info.rows , PROTO_READ|PROTO_WRITE, MAP_ANONYMOUS|MAP_PRIVATE, 0 ,0 )) != NULL) {

		if (ipc_call_sync_3(fb_info.phone, IPC_M_AS_AREA_SEND, (ipcarg_t)interbuffer, 0, AS_AREA_READ, NULL, NULL, NULL) != 0) {

			munmap(interbuffer, sizeof(keyfield_t) * fb_info.cols * fb_info.rows);

			interbuffer = NULL;

		}

	}

	async_new_connection(phonehash, 0, NULL, keyboard_events);

	sync_send_2(fb_info.phone, FB_CURSOR_GOTO, 0, 0, NULL, NULL); 

	nsend_call(fb_info.phone, FB_CURSOR_VISIBILITY, 1); 

	/* Register at NS */

	if (ipc_connect_to_me(PHONE_NS, SERVICE_CONSOLE, 0, &phonehash) != 0) {

		return -1;

	};

	async_manager();

	return 0;	

}