/*
 * $Id$
 *
 * Copyright (C) 2002, 2003 ETC s.r.o.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
 * 02111-1307, USA.
 *
 * Written by Marcel Telka <marcel@telka.sk>, 2002, 2003.
 *
 */

#include "sysdep.h"

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <readline/readline.h>
#include <readline/history.h>

#include "chain.h"
#include "bus.h"
#include "cmd.h"
#include "jtag.h"

#ifndef HAVE_GETLINE
ssize_t getline( char **lineptr, size_t *n, FILE *stream );
#endif

chain_t *chain = NULL;
int big_endian = 0;

static char *
get_token( char *buf )
{
	char *t = strtok( buf, " \f\n\r\t\v" );
	if (t && (*t == '#'))
		return NULL;
	return t;
}

#define	JTAGDIR		".jtag"
#define	HISTORYFILE	"history"
#define	RCFILE		"rc"

static void
jtag_create_jtagdir( void )
{
	char *home = getenv( "HOME" );
	char *jdir;

	if (!home)
		return;

	jdir = malloc( strlen(home) + strlen(JTAGDIR) + 2 );	/* "/" and trailing \0 */
	if (!jdir)
		return;

	strcpy( jdir, home );
	strcat( jdir, "/" );
	strcat( jdir, JTAGDIR );

	/* Create the directory if it doesn't exists. */
	mkdir( jdir, S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH );

	free( jdir );
}
						 
static void
jtag_load_history( void )
{
	char *home = getenv( "HOME" );
	char *file;

	using_history();

	if (!home)
		return;

	file = malloc( strlen(home) + strlen(JTAGDIR) + strlen(HISTORYFILE) + 3 );	/* 2 x "/" and trailing \0 */
	if (!file)
		return;

	strcpy( file, home );
	strcat( file, "/" );
	strcat( file, JTAGDIR );
	strcat( file, "/" );
	strcat( file, HISTORYFILE );

	read_history( file );

	free( file );
}

static void
jtag_save_history( void )
{
	char *home = getenv( "HOME" );
	char *file;

	if (!home)
		return;

	file = malloc( strlen(home) + strlen(JTAGDIR) + strlen(HISTORYFILE) + 3);	/* 2 x "/" and trailing \0 */
	if (!file)
		return;

	strcpy( file, home );
	strcat( file, "/" );
	strcat( file, JTAGDIR );
	strcat( file, "/");
	strcat( file, HISTORYFILE );

	write_history( file );

	free( file );
}

static int
jtag_parse_line( char *line )
{
	char *t;
	int l;
	int n;
	char **a;
	int r;

	if (!line || !(strlen( line ) > 0))
		return 1;

	t = get_token( line );
	if (!t)
		return 1;

	n = 0;
	l = 0;
	a = NULL;
	while (t) {
		if (n + 2 > l) {
			char **newa;
			l = (l < 16) ? 16 : (l * 2);
			newa = realloc( a, l * sizeof (char *) );
			if (!newa) {
				free( a );
				printf( _("Out of memory\n") );
				return 1;
			}
			a = newa;
		}
		a[n++] = t;
		a[n] = NULL;
		
		t = get_token( NULL );
	}

	r = cmd_run( a );
	free( a );
	return r;
}

static void
jtag_readline_loop( const char *prompt )
{
	char *line = NULL;

	/* Iterate */
	while (jtag_parse_line( line )) {
		free( line );

		/* Read a line from the terminal */
		line = readline( prompt );

		/* Check if we actually got something */
		if (line && (strlen( line ) > 0))
			add_history( line );
	}
	free( line );
}

int
jtag_parse_file( const char *filename )
{
	FILE *f;
	int go = 1;
	char *line = NULL;
	int n = 0;

	if (strcmp( filename, "-" ) != 0)
		f = fopen( filename, "r" );
	else		
		f = stdin;
	if (!f)
		return -1;

	while (go && (getline( &line, &n, f ) != -1))
		if ((strlen(line) > 0) && (line[0] != '#'))
			go = jtag_parse_line(line);

	free(line);
	if (strcmp( filename, "-" ) != 0)
		fclose(f);

	return go;
}

static int
jtag_parse_rc( void )
{
	char *home = getenv( "HOME" );
	char *file;
	int go;

	if (!home)
		return 1;

	file = malloc( strlen(home) + strlen(JTAGDIR) + strlen(RCFILE) + 3 );	/* 2 x "/" and trailing \0 */
	if (!file)
		return 1;

	strcpy( file, home );
	strcat( file, "/" );
	strcat( file, JTAGDIR );
	strcat( file, "/" );
	strcat( file, RCFILE );

	go = jtag_parse_file( file );

	free( file );

	return go;
}

int
main( int argc, const char **argv )
{
	int go = 1;
	int i;

#ifdef ENABLE_NLS
	/* l10n support */
	setlocale( LC_ALL, "" );
	bindtextdomain( PACKAGE, LOCALEDIR );
	textdomain( PACKAGE );
#endif /* ENABLE_NLS */

	printf(
			_("%s\n"
			"Copyright (C) 2002, 2003 ETC s.r.o.\n"
			"%s is free software, covered by the GNU General Public License, and you are\n"
			"welcome to change it and/or distribute copies of it under certain conditions.\n"
			"There is absolutely no warranty for %s.\n\n"), PACKAGE_STRING, PACKAGE_NAME, PACKAGE_NAME
	);

	chain = chain_alloc();
	if (!chain) {
		printf( _("Out of memory\n") );
		return -1;
	}

	printf( _("Warning: %s may damage your hardware! Type \"quit\" for exit!\n\n"), PACKAGE_NAME );
	printf( _("Type \"help\" for help.\n\n") );

	for (i = 1; i < argc; i++) {
		go = jtag_parse_file( argv[i] );
		if (go < 0)
			printf( _("Unable to open file `%s'!\n"), argv[i] );
		if (!go)
			break;
	}

	if (go) {
		/* Create ~/.jtag */
		jtag_create_jtagdir();

		/* Parse and execute the RC file */
		go = jtag_parse_rc();

		if (go) {
			/* Load history */
			jtag_load_history();

			/* main loop */
			jtag_readline_loop( "jtag> " );

			/* Save history */
			jtag_save_history();
		}
	}

	if (bus) {
		bus->free( bus );
		bus = NULL;
	}
	chain_free( chain );

	return 0;
}