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/* ----------------------------------------------------------------------- *
 *
 *   Copyright 2007-2008 H. Peter Anvin - All Rights Reserved
 *
 *   Permission is hereby granted, free of charge, to any person
 *   obtaining a copy of this software and associated documentation
 *   files (the "Software"), to deal in the Software without
 *   restriction, including without limitation the rights to use,
 *   copy, modify, merge, publish, distribute, sublicense, and/or
 *   sell copies of the Software, and to permit persons to whom
 *   the Software is furnished to do so, subject to the following
 *   conditions:
 *
 *   The above copyright notice and this permission notice shall
 *   be included in all copies or substantial portions of the Software.
 *
 *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
 *   OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 *   HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 *   WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 *   FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 *   OTHER DEALINGS IN THE SOFTWARE.
 *
 * ----------------------------------------------------------------------- */

#include <stdlib.h>
#include <string.h>

#define lnetlib_c       /* Define the library */

#include "lua.h"
#include "lauxlib.h"
#include "lualib.h"
#include "syslinux/boot.h"
#include "syslinux/loadfile.h"
#include "syslinux/linux.h"
#include "../../../menu/libmenu/com32io.h"

int __parse_argv(char ***argv, const char *str);

#define SYSLINUX_FILE "syslinux_file"

typedef struct syslinux_file {
  char *data;
  char *name;
  size_t size;
} syslinux_file;

/*
 * Most code taken from:
 *	com32/modules/linux.c
 */

/* Find the last instance of a particular command line argument
   (which should include the final =; do not use for boolean arguments) */
static char *find_argument(char **argv, const char *argument)
{
  int la = strlen(argument);
  char **arg;
  char *ptr = NULL;

  for (arg = argv; *arg; arg++) {
    if (!memcmp(*arg, argument, la))
      ptr = *arg + la;
  }

  return ptr;
}

/* Get a value with a potential suffix (k/m/g/t/p/e) */
static unsigned long long suffix_number(const char *str)
{
  char *ep;
  unsigned long long v;
  int shift;

  v = strtoull(str, &ep, 0);
  switch (*ep|0x20) {
  case 'k':
    shift = 10;
    break;
  case 'm':
    shift = 20;
    break;
  case 'g':
    shift = 30;
    break;
  case 't':
    shift = 40;
    break;
  case 'p':
    shift = 50;
    break;
  case 'e':
    shift = 60;
    break;
  default:
    shift = 0;
    break;
  }
  v <<= shift;

  return v;
}

/* Truncate to 32 bits, with saturate */
static inline uint32_t saturate32(unsigned long long v)
{
  return (v > 0xffffffff) ? 0xffffffff : (uint32_t)v;
}

/* Stitch together the command line from a set of argv's */
static char *make_cmdline(char **argv)
{
  char **arg;
  size_t bytes;
  char *cmdline, *p;

  bytes = 1;			/* Just in case we have a zero-entry cmdline */
  for (arg = argv; *arg; arg++) {
    bytes += strlen(*arg)+1;
  }

  p = cmdline = malloc(bytes);
  if (!cmdline)
    return NULL;

  for (arg = argv; *arg; arg++) {
    int len = strlen(*arg);
    memcpy(p, *arg, len);
    p[len] = ' ';
    p += len+1;
  }

  if (p > cmdline)
    p--;			/* Remove the last space */
  *p = '\0';

  return cmdline;
}


static int sl_run_command(lua_State *L)
{
  const char *cmd = luaL_checkstring(L, 1);  /* Reads the string parameter */
  syslinux_run_command(cmd);
  return 0;
}

/* do default boot */
static int sl_run_default(lua_State *L)
{
  syslinux_run_default();
  return 0;
}

/* do local boot */
static int sl_local_boot(lua_State *L)
{
  uint16_t flags = luaL_checkint(L, 1);
  syslinux_local_boot(flags);
  return 0;
}

static int sl_final_cleanup(lua_State *L)
{
  uint16_t flags = luaL_checkint(L, 1);
  syslinux_local_boot(flags);
  return 0;
}

/* boot linux kernel and initrd */
static int sl_boot_linux(lua_State *L)
{
  const char *kernel = luaL_checkstring(L, 1);
  const char *cmdline = luaL_optstring(L, 2, "");
  char *initrd;
  void *kernel_data, *file_data;
  size_t kernel_len, file_len;
  struct initramfs *initramfs;
  char *newcmdline;
  uint32_t mem_limit = luaL_optint(L, 3, 0);
  uint16_t video_mode = luaL_optint(L, 4, 0);
  int ret, i;
  char **argv, **argp, *arg, *p;

  ret = __parse_argv(&argv, cmdline);

  newcmdline = malloc(strlen(kernel)+12);
  if (!newcmdline)
    printf("Mem alloc failed: cmdline\n");

  strcpy(newcmdline, "BOOT_IMAGE=");
  strcpy(newcmdline+strlen(newcmdline), kernel);
  argv[0] = newcmdline;
  argp = argv;

  /* DEBUG
  for (i=0; i<ret; i++)
    printf("%d: %s\n", i, argv[i]);
  */

  newcmdline = make_cmdline(argp);
  if (!newcmdline)
    printf("Creating command line failed!\n");

  /* DEBUG
  printf("Command line: %s\n", newcmdline);
  sleep(1000);
  */
  
  /* Look for specific command-line arguments we care about */
  if ((arg = find_argument(argp, "mem=")))
    mem_limit = saturate32(suffix_number(arg));

  if ((arg = find_argument(argp, "vga="))) {
    switch (arg[0] | 0x20) {
    case 'a':			/* "ask" */
      video_mode = 0xfffd;
      break;
    case 'e':			/* "ext" */
      video_mode = 0xfffe;
      break;
    case 'n':			/* "normal" */
      video_mode = 0xffff;
      break;
    default:
      video_mode = strtoul(arg, NULL, 0);
      break;
    }
  }
 

  printf("Loading kernel %s...\n", kernel);
  if (loadfile(kernel, &kernel_data, &kernel_len))
    printf("failed!\n");
  else printf("ok\n");

  initramfs = initramfs_init();
  if (!initramfs)
    printf("Initializing initrd failed!\n");

  if ((arg = find_argument(argp, "initrd="))) {
    do {
      p = strchr(arg, ',');
      if (p)
        *p = '\0';

      initrd = arg;
      printf("Loading initrd %s... ", initrd);
      if (initramfs_load_archive(initramfs, initrd)) {
        printf("failed!\n");
      }
      printf("ok\n");

      if (p)
        *p++ = ',';
    } while ((arg = p));
  }

  if (!loadfile("/testfile1", &file_data, &file_len)) {
    if (initramfs_add_file(initramfs, file_data, file_len, file_len,
                           "/testfile1", 0, 0755))
       printf("Adding extra file failed\n");
  } else printf("Loading extra file failed\n");

  /* DEBUG
  sleep(10000);
  */

  ret = syslinux_boot_linux(kernel_data, kernel_len, initramfs, newcmdline,
                      video_mode, mem_limit);
  printf("syslinux_boot_linux returned %d\n", ret);

  return 0;
}


/* sleep for msec milliseconds */
static int sl_sleep(lua_State *L)
{
  unsigned int msec = luaL_checkint(L, 1);
  sleep(msec);
  return 0;
}


static int sl_run_kernel_image(lua_State *L)
{
  const char *filename = luaL_checkstring(L, 1);
  const char *cmdline = luaL_checkstring(L, 2);
  uint32_t ipappend_flags = luaL_checkint(L, 3);
  uint32_t type = luaL_checkint(L, 4);

  syslinux_run_kernel_image(filename, cmdline, ipappend_flags, type);
  return 0;
}

static int sl_loadfile(lua_State *L)
{
  const char *filename = luaL_checkstring(L, 1);
  syslinux_file *file;

  void *file_data;
  size_t file_len;

  if (loadfile(filename, &file_data, &file_len)) {
    lua_pushstring(L, "Could not load file");
    lua_error(L);
  }

  file = malloc(sizeof(syslinux_file));
  file->name = filename;
  file->size = file_len;
  file->data = file_data;

  lua_pushlightuserdata(L, file);
  luaL_getmetatable(L, SYSLINUX_FILE);
  lua_setmetatable(L, -2);

  return 1;
}


static int sl_filesize(lua_State *L)
{
  const syslinux_file *file = luaL_checkudata(L, 1, SYSLINUX_FILE);

  lua_pushinteger(L, file->size);

  return 1;
}


static int sl_filename(lua_State *L)
{
  const syslinux_file *file = luaL_checkudata(L, 1, SYSLINUX_FILE);

  lua_pushstring(L, file->name);

  return 1;
}


static int sl_initramfs_init(lua_State *L)
{
  struct initramfs *initramfs;

  initramfs = initramfs_init();
  if (!initramfs)
    printf("Initializing initrd failed!\n");

  lua_pushlightuserdata(L, initramfs);
  luaL_getmetatable(L, SYSLINUX_FILE);
  lua_setmetatable(L, -2);

  return 1;
}


static int sl_initramfs_load_archive(lua_State *L)
{
  const struct initramfs *initramfs = luaL_checkudata(L, 1, SYSLINUX_FILE);
  const char *filename = luaL_checkstring(L, 2);

  if (initramfs_load_archive(initramfs, filename)) {
    printf("failed!\n");
  }

  return 0;
}

static int sl_initramfs_add_file(lua_State *L)
{
  const struct initramfs *initramfs = luaL_checkudata(L, 1, SYSLINUX_FILE);
  const char *filename = luaL_checkstring(L, 2);
  void *file_data;
  size_t file_len = 0;

  if (initramfs_add_file(initramfs, file_data, file_len, file_len,
                           "/testfile1", 0, 0755))

  return 0;
}

static int sl_boot_it(lua_State *L)
{
  const syslinux_file *kernel = luaL_checkudata(L, 1, SYSLINUX_FILE);
  const struct initramfs *initramfs = luaL_checkudata(L, 2, SYSLINUX_FILE);
  const char *cmdline = luaL_optstring(L, 3, "");
  uint32_t mem_limit = luaL_optint(L, 4, 0);
  uint16_t video_mode = luaL_optint(L, 5, 0);
  int ret;

  ret = syslinux_boot_linux(kernel->data, kernel->size, initramfs, cmdline,
                      video_mode, mem_limit);

  return 0;
}

static const luaL_reg syslinuxlib[] = {
  {"run_command", sl_run_command},
  {"run_default", sl_run_default},
  {"local_boot", sl_local_boot},
  {"final_cleanup", sl_final_cleanup},
  {"boot_linux", sl_boot_linux},
  {"run_kernel_image", sl_run_kernel_image},
  {"sleep", sl_sleep},
  {"loadfile", sl_loadfile},
  {"filesize", sl_filesize},
  {"filename", sl_filename},
  {"initramfs_init", sl_initramfs_init},
  {"initramfs_load_archive", sl_initramfs_load_archive},
  {"initramfs_add_file", sl_initramfs_add_file},
  {"boot_it", sl_boot_it},
  {NULL, NULL}
};

/* This defines a function that opens up your library. */

LUALIB_API int luaopen_syslinux (lua_State *L) {

  luaL_newmetatable(L, SYSLINUX_FILE);

  luaL_openlib(L, LUA_SYSLINUXLIBNAME, syslinuxlib, 0);
  return 1;
}