#include <stdint.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <getopt.h>
#include <ipxe/settings.h>
#include <ipxe/command.h>

FILE_LICENCE ( GPL2_OR_LATER );

static int show_exec ( int argc, char **argv ) {
	char buf[256];
	int rc;

	if ( argc != 2 ) {
		printf ( "Syntax: %s <identifier>\n", argv[0] );
		return 1;
	}

	if ( ( rc = fetchf_named_setting ( argv[1], buf,
					   sizeof ( buf ) ) ) < 0 ){
		printf ( "Could not find \"%s\": %s\n",
			 argv[1], strerror ( rc ) );
		return 1;
	}

	printf ( "%s = %s\n", argv[1], buf );
	return 0;
}

static int set_exec ( int argc, char **argv ) {
	size_t len;
	int i;
	int rc;

	if ( argc < 3 ) {
		printf ( "Syntax: %s <identifier> <value>\n", argv[0] );
		return 1;
	}

	/* Determine total length of command line */
	len = 1; /* NUL */
	for ( i = 2 ; i < argc ; i++ )
		len += ( 1 /* possible space */ + strlen ( argv[i] ) );

	{
		char buf[len];
		char *ptr = buf;

		/* Assemble command line */
		buf[0] = '\0';
		for ( i = 2 ; i < argc ; i++ ) {
			ptr += sprintf ( ptr, "%s%s", ( buf[0] ? " " : "" ),
					 argv[i] );
		}
		assert ( ptr < ( buf + len ) );

		if ( ( rc = storef_named_setting ( argv[1], buf ) ) != 0 ) {
			printf ( "Could not set \"%s\"=\"%s\": %s\n",
				 argv[1], buf, strerror ( rc ) );
			return 1;
		}
	}

	return 0;
}

static int clear_exec ( int argc, char **argv ) {
	int rc;

	if ( argc != 2 ) {
		printf ( "Syntax: %s <identifier>\n", argv[0] );
		return 1;
	}

	if ( ( rc = delete_named_setting ( argv[1] ) ) != 0 ) {
		printf ( "Could not clear \"%s\": %s\n",
			 argv[1], strerror ( rc ) );
		return 1;
	}
	
	return 0;
}

struct command nvo_commands[] __command = {
	{
		.name = "show",
		.exec = show_exec,
	},
	{
		.name = "set",
		.exec = set_exec,
	},	
	{
		.name = "clear",
		.exec = clear_exec,
	},
};