/*-
 * Copyright (c) 2011 Wojciech A. Koszek <wkoszek@FreeBSD.org>
 * Copyright (c) 2014 Pedro Souza <pedrosouza@freebsd.org>
 * 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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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 <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include <stand.h>

#include "bootstrap.h"
#include "interp.h"

#define lua_c

#include <src/lua.h>
#include <src/ldebug.h>
#include <src/lauxlib.h>
#include <src/lualib.h>
#include <lutils.h>

struct interp_lua_softc {
	lua_State	*luap;
};

static struct interp_lua_softc lua_softc;

#ifdef LUA_DEBUG
#define	LDBG(...)	do {			\
	printf("%s(%d): ", __func__, __LINE__);	\
	printf(__VA_ARGS__);			\
	printf("\n");				\
} while (0)
#else
#define	LDBG(...)
#endif


void
interp_lua_init(void *ctx)
{
	lua_State *luap;
	struct bootblk_command **cmdp;
	struct interp_lua_softc	*softc;
	struct env_var *ev;
	const char *name_str, *val_str;
	char buf[16];

	softc = ctx;
	LDBG("creating context");
	luap = lua_create();
	if (luap == NULL) {
		printf("problem initializing the Lua interpreter\n");
		abort();
	}
	softc->luap = luap;
	register_utils(luap);
	luaopen_base(luap);
	luaL_requiref(luap, LUA_STRLIBNAME, luaopen_string, 1);
	lua_pop(luap, 1);
}

int
interp_lua_run(void *data, const char *line)
{
	lua_State *luap;
	struct interp_lua_softc	*softc;
	int argc, ret;
	char **argv;
	char loader_line[128];
	int status;
	int len;

	softc = data;
	luap = softc->luap;
	LDBG("executing line...");
	if ((status = ldo_string(luap, line, strlen(line))) != 0) {
		/*
		 * If we could not parse the line as Lua syntax,
		 * try parsing it as a loader command.
		 */
		len = snprintf(loader_line, sizeof(loader_line),
		    "loader.perform(\"%s\")", line);
		if (len > 0)
			status = ldo_string(luap, loader_line,
			    len);
	}
	if (status != 0)
		printf("Failed to parse \'%s\'\n", line);

	return (0);
}

int
interp_lua_incl(void *ctx, const char *filename)
{
	struct interp_lua_softc *softc;

	softc = ctx;
	LDBG("loading file %s", filename);

	return (ldo_file(softc->luap, filename));
}

/*
 * To avoid conflicts, this lua interpreter uses loader.lua instead of
 * loader.rc/boot.conf to load its configurations.
 */
int
interp_lua_load_config(void *ctx)
{
	LDBG("loading config");

	return (interp_lua_incl(ctx, "/boot/loader.lua"));
}

struct interp boot_interp_lua = {
	.init = interp_lua_init,
	.run = interp_lua_run,
	.incl = interp_lua_incl,
	.load_configs = interp_lua_load_config,
	.context = &lua_softc
};