/*
 * $Id$
 *
    Copyright (c) 2014-2016 Chung, Hyung-Hwan. All rights reserved.

    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions
    are met:
    1. Redistributions of source code must retain the above copyright
       notice, this list of conditions and the following disclaimer.
    2. 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.

    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 "mod-con.h"
#include <stix-utl.h>

#include "stix-prv.h"  /* TODO: remove this header after refactoring it */

#include <unistd.h>
#include <fcntl.h> 

#include <stdlib.h> /* getenv */

#include <curses.h>
#include <term.h>

#include <sys/ioctl.h>

typedef struct console_t console_t;
struct console_t
{
	int fd;
	int fd_opened;
	char* cup;
	char* clear;
};
/* ------------------------------------------------------------------------ */

static int prim_open (stix_t* stix, stix_ooi_t nargs)
{
#if defined(_WIN32)
	HANDLE h;
	stix_ooi_t immv;

	h = GetStdHandle(STD_INPUT_HANDLE);
	if (h == INVALID_HANDLE_VALUE) return 0;
	if (h == NULL)
	{
	}

	imm = stix_makeimm (stix, h);
	if (imm <= -1) 
	{
		/* error */
	}

	rsrc = stix_makersrc (stix, h);

#else

	console_t* con;
	int err;
	char* term;

	con = stix_callocmem (stix, STIX_SIZEOF(*con));
	if (!con) return 0;

	if (isatty(1))
	{
		con->fd = 1;
	}
	else
	{
		con->fd = open ("/dev/tty", O_RDWR, 0);
		if (con->fd == -1)
		{
			/* TODO: failed to open /dev/stdout */
			stix_freemem (stix, con);
			return 0;
		}

		con->fd_opened = 1;
	}

	term = getenv ("TERM");
	if (term && setupterm (term, con->fd, &err) == OK)
	{
	}

	con->cup = tigetstr ("cup"); /* TODO: error check */
	con->clear = tigetstr ("clear");

#if 0
	{
	const char* cup, * clear;
	struct winsize wsz;

	cup = tigetstr ("cup");
	clear = tigetstr ("clear");
	ioctl (fd, TIOCGWINSZ, &wsz);

	write (fd, clear, strlen(clear));
	/*write (fd, tparm (cup, wsz.ws_row - 1, 0), strlen(tparm (cup, wsz.ws_row - 1, 0)));*/
	write (fd, tiparm (cup, 0, 0), strlen(tiparm (cup, 0, 0)));
	}
#endif

#endif

	STIX_STACK_SETRET (stix, nargs, STIX_SMOOI_TO_OOP((stix_oow_t)con));
	return 1;
}

static int prim_close (stix_t* stix, stix_ooi_t nargs)
{
#if defined(_WIN32)
	HANDLE h;

	h = STIX_STACK_GETARG (stix, nargs, 0);
#else
#endif
	console_t* con;

	con = STIX_OOP_TO_SMOOI(STIX_STACK_GETARG (stix, nargs, 0));
	/* TODO: sanity check */

	if (con->fd_opened) close (con->fd);

	STIX_STACK_SETRETTORCV (stix, nargs);
	return 1;
}

static int prim_write (stix_t* stix, stix_ooi_t nargs)
{
	console_t* con;
	stix_oop_char_t oomsg;

	stix_oow_t ucspos, ucsrem, ucslen, bcslen;
	stix_bch_t bcs[1024];
	int n;

	con = STIX_OOP_TO_SMOOI(STIX_STACK_GETARG (stix, nargs, 0));
	oomsg = (stix_oop_char_t)STIX_STACK_GETARG (stix, nargs, 1);

	if (STIX_CLASSOF(stix,oomsg) != stix->_string)
	{
/* TODO: invalid message */
		return 0;
	}

	ucspos = 0;
	ucsrem = STIX_OBJ_GET_SIZE(oomsg);
	while (ucsrem > 0)
	{
		ucslen = ucsrem;
		bcslen = STIX_COUNTOF(bcs);
		if ((n = stix_ucstoutf8 (&oomsg->slot[ucspos], &ucslen, bcs, &bcslen)) <= -1)
		{
			if (n != -2 || ucslen <= 0) 
			{
				stix_seterrnum (stix, STIX_EECERR);
				return -1;
			}
		}

		write (con->fd, bcs, bcslen); /* TODO: error handling */
/* TODO: abort looping for async processing???? */
		ucspos += ucslen;
		ucsrem -= ucslen;
	}

	STIX_STACK_SETRETTORCV (stix, nargs); /* TODO: change return code */
	return 1;
}

static int prim_setcursor (stix_t* stix, stix_ooi_t nargs)
{
	console_t* con;
	stix_ooi_t x, y;
	char* cup;

	con = STIX_OOP_TO_SMOOI(STIX_STACK_GETARG(stix, nargs, 0));
	point = STIX_OOP_TO_SMOOI(STIX_STACK_GETARG(stix, nargs, 1));

	cup = tiparm (con->cup, point->slot[0], point->slot[1]);
	write (con->fd, cup, strlen(cup)); /* TODO: error check */
	free (cup);
	return 1;
}

/* ------------------------------------------------------------------------ */

typedef struct fnctab_t fnctab_t;
struct fnctab_t
{
	const stix_bch_t* name;
	stix_prim_impl_t handler;
};

static fnctab_t fnctab[] =
{
	{ "close",      prim_close     },
	{ "open",       prim_open      },
	{ "setcursor",  prim_setcursor },
	{ "write",      prim_write     },
};

/* ------------------------------------------------------------------------ */

static stix_prim_impl_t query (stix_t* stix, stix_prim_mod_t* mod, const stix_ooch_t* name)
{
	int left, right, mid, n;

	left = 0; right = STIX_COUNTOF(fnctab) - 1;

	while (left <= right)
	{
		mid = (left + right) / 2;

		n = stix_compoocbcstr (name, fnctab[mid].name);
		if (n < 0) right = mid - 1; 
		else if (n > 0) left = mid + 1;
		else
		{
			return fnctab[mid].handler;
		}
	}

	stix->errnum = STIX_ENOENT;
	return STIX_NULL;
}


static void unload (stix_t* stix, stix_prim_mod_t* mod)
{
	/* TODO: close all open handle?? */
}


int stix_prim_mod_con (stix_t* stix, stix_prim_mod_t* mod)
{
	mod->query = query;
	mod->unload = unload;
	mod->ctx = STIX_NULL;
	return 0;
}