/*
** $Id$
** Standard I/O (and system) library
** See Copyright Notice in lua.h
*/

#define FORBIDDEN_SYMBOL_EXCEPTION_sprintf

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

#define liolib_c
#define LUA_LIB

#include "lua.h"

#include "lauxlib.h"
#include "lualib.h"
#include "common/textconsole.h"
#include "scummvm_file.h"


#define IO_INPUT	1
#define IO_OUTPUT	2


//static const char *const fnames[] = {"input", "output"};


static int pushresult (lua_State *L, int i, const char *filename) {
  int en = 0; /*errno;*/  // Currently hardcoded for ScumMVM, this may need to be changed
  if (i) {
    lua_pushboolean(L, 1);
    return 1;
  }
  else {
    lua_pushnil(L);
    if (filename)
      lua_pushfstring(L, "%s: %s", filename, "General error" /*strerror(en)*/);
    else
      lua_pushfstring(L, "%s", "General error" /*strerror(en)*/);
    lua_pushinteger(L, en);
    return 3;
  }
}

/*
static void fileerror (lua_State *L, int arg, const char *filename) {
  lua_pushfstring(L, "%s: %s", filename, "LUA I/O error descriptions have been removed in ScummVM");
  luaL_argerror(L, arg, lua_tostring(L, -1));
}
*/

#define tofilep(L)	((FILE **)luaL_checkudata(L, 1, LUA_FILEHANDLE))
#define tofileProxy(L)	((Lua::LuaFileProxy **)luaL_checkudata(L, 1, LUA_FILEHANDLE))

static int io_type (lua_State *L) {
	return luaL_error(L, "%s", "LUA I/O has been removed in ScummVM");
/*
  void *ud;
  luaL_checkany(L, 1);
  ud = lua_touserdata(L, 1);
  lua_getfield(L, LUA_REGISTRYINDEX, LUA_FILEHANDLE);
  if (ud == NULL || !lua_getmetatable(L, 1) || !lua_rawequal(L, -2, -1))
    lua_pushnil(L);  // not a file
  else if (*((FILE **)ud) == NULL)
    lua_pushliteral(L, "closed file");
  else
    lua_pushliteral(L, "file");
  return 1;
*/
}

static Lua::LuaFileProxy *tofile (lua_State *L) {
  Lua::LuaFileProxy **f = tofileProxy(L);
  if (*f == NULL)
    luaL_error(L, "attempt to use a closed file");
  return *f;
}


/*
** When creating file handles, always creates a `closed' file handle
** before opening the actual file; so, if there is a memory error, the
** file is not left opened.
*/
static Lua::LuaFileProxy **newfile (lua_State *L) {
	Lua::LuaFileProxy **pf = (Lua::LuaFileProxy **)lua_newuserdata(L, sizeof(Lua::LuaFileProxy *));
  *pf = NULL;  /* file handle is currently `closed' */
  luaL_getmetatable(L, LUA_FILEHANDLE);
  lua_setmetatable(L, -2);
  return pf;
}


/*
** function to (not) close the standard files stdin, stdout, and stderr
*/
static int io_noclose (lua_State *L) {
  lua_pushnil(L);
  lua_pushliteral(L, "cannot close standard file");
  return 2;
}


/*
** function to close 'popen' files
*/
static int io_pclose (lua_State *L) {
	error("LUA I/O has been removed in ScummVM");
/*
  FILE **p = tofilep(L);
  int ok = lua_pclose(L, *p);
  *p = NULL;
  return pushresult(L, ok, NULL);
  */
}


/*
** function to close regular files
*/
static int io_fclose (lua_State *L) {
	error("LUA I/O has been removed in ScummVM");
	/*
  FILE **p = tofilep(L);
  int ok = (fclose(*p) == 0);
  *p = NULL;
  return pushresult(L, ok, NULL);
  */
}

/*
static int aux_close (lua_State *L) {
  lua_getfenv(L, 1);
  lua_getfield(L, -1, "__close");
  return (lua_tocfunction(L, -1))(L);
}
*/

static int io_close (lua_State *L) {
  if (lua_isnone(L, 1))
    lua_rawgeti(L, LUA_ENVIRONINDEX, IO_OUTPUT);

  Lua::LuaFileProxy **f = tofileProxy(L);
  delete *f;
  *f = NULL;

  return 0;
}


static int io_gc (lua_State *L) {
  Lua::LuaFileProxy **f = tofileProxy(L);
  // ignore closed files
  if (*f != NULL)
    delete *f;

  return 0;
}


static int io_tostring (lua_State *L) {
  error("LUA I/O has been removed in ScummVM");
  /*
  FILE *f = *tofilep(L);
  if (f == NULL)
    lua_pushliteral(L, "file (closed)");
  else
    lua_pushfstring(L, "file (%p)", f);
  return 1;
  */
}


static int io_open (lua_State *L) {
  const char *filename = luaL_checkstring(L, 1);
  const char *mode = luaL_optstring(L, 2, "r");
  Lua::LuaFileProxy **pf = newfile(L);
  *pf = Lua::LuaFileProxy::create(filename, mode);
  return (*pf == NULL) ? pushresult(L, 0, filename) : 1;
}


/*
** this function has a separated environment, which defines the
** correct __close for 'popen' files
*/
static int io_popen (lua_State *L) {
  error("LUA I/O has been removed in ScummVM");
/*
  const char *filename = luaL_checkstring(L, 1);
  const char *mode = luaL_optstring(L, 2, "r");
  FILE **pf = newfile(L);
  *pf = lua_popen(L, filename, mode);
  return (*pf == NULL) ? pushresult(L, 0, filename) : 1;
  */
}


static int io_tmpfile (lua_State *L) {
  return luaL_error(L, "%s", "LUA I/O error descriptions have been removed in ScummVM");
}

/*
static FILE *getiofile (lua_State *L, int findex) {
  FILE *f;
  lua_rawgeti(L, LUA_ENVIRONINDEX, findex);
  f = *(FILE **)lua_touserdata(L, -1);
  if (f == NULL)
    luaL_error(L, "standard %s file is closed", fnames[findex - 1]);
  return f;
}
*/
/*
static int g_iofile (lua_State *L, int f, const char *mode) {
  if (!lua_isnoneornil(L, 1)) {
    const char *filename = lua_tostring(L, 1);
    if (filename) {
      FILE **pf = newfile(L);
      *pf = fopen(filename, mode);
      if (*pf == NULL)
        fileerror(L, 1, filename);
    }
    else {
      tofile(L);  // check that it's a valid file handle
      lua_pushvalue(L, 1);
    }
    lua_rawseti(L, LUA_ENVIRONINDEX, f);
  }
  // return current value
  lua_rawgeti(L, LUA_ENVIRONINDEX, f);
  return 1;
}
*/

static int io_input (lua_State *L) {
  error("LUA I/O has been removed in ScummVM");
//  return g_iofile(L, IO_INPUT, "r");
}


static int io_output (lua_State *L) {
  error("LUA I/O has been removed in ScummVM");
//  return g_iofile(L, IO_OUTPUT, "w");
}


static int io_readline (lua_State *L);


static void aux_lines (lua_State *L, int idx, int toclose) {
  lua_pushvalue(L, idx);
  lua_pushboolean(L, toclose);  /* close/not close file when finished */
  lua_pushcclosure(L, io_readline, 2);
}


static int f_lines (lua_State *L) {
  tofile(L);  /* check that it's a valid file handle */
  aux_lines(L, 1, 0);
  return 1;
}


static int io_lines (lua_State *L) {
  error("LUA I/O has been removed in ScummVM");
/*
  if (lua_isnoneornil(L, 1)) {  // no arguments?
    // will iterate over default input
    lua_rawgeti(L, LUA_ENVIRONINDEX, IO_INPUT);
    return f_lines(L);
  }
  else {
    const char *filename = luaL_checkstring(L, 1);
    FILE **pf = newfile(L);
    *pf = fopen(filename, "r");
    if (*pf == NULL)
      fileerror(L, 1, filename);
    aux_lines(L, lua_gettop(L), 1);
    return 1;
  }
  */
}


/*
** {======================================================
** READ
** =======================================================
*/

/*
static int read_number (lua_State *L, Lua::LuaFileProxy *f) {
  lua_Number d;
  if (fscanf(f, LUA_NUMBER_SCAN, &d) == 1) {
    lua_pushnumber(L, d);
    return 1;
  }
  else return 0;  // read fails
}


static int test_eof (lua_State *L, Lua::LuaFileProxy *f) {
  int c = getc(f);
  ungetc(c, f);
  lua_pushlstring(L, NULL, 0);
  return (c != EOF);
}


static int read_line (lua_State *L, Lua::LuaFileProxy *f) {
  luaL_Buffer b;
  luaL_buffinit(L, &b);
  for (;;) {
    size_t l;
    char *p = luaL_prepbuffer(&b);
    if (fgets(p, LUAL_BUFFERSIZE, f) == NULL) {  // eof?
      luaL_pushresult(&b);  // close buffer
      return (lua_objlen(L, -1) > 0);  // check whether read something
    }
    l = strlen(p);
    if (l == 0 || p[l-1] != '\n')
      luaL_addsize(&b, l);
    else {
      luaL_addsize(&b, l - 1);  // do not include `eol'
      luaL_pushresult(&b);  // close buffer
      return 1;  // read at least an `eol'
    }
  }
}


static int read_chars (lua_State *L, Lua::LuaFileProxy *f, size_t n) {
  size_t rlen;  // how much to read
  size_t nr;  // number of chars actually read
  luaL_Buffer b;
  luaL_buffinit(L, &b);
  rlen = LUAL_BUFFERSIZE;  // try to read that much each time
  do {
    char *p = luaL_prepbuffer(&b);
    if (rlen > n) rlen = n;  // cannot read more than asked
    nr = fread(p, sizeof(char), rlen, f);
    luaL_addsize(&b, nr);
    n -= nr;  // still have to read `n' chars
  } while (n > 0 && nr == rlen);  // until end of count or eof
  luaL_pushresult(&b);  // close buffer
  return (n == 0 || lua_objlen(L, -1) > 0);
}


static int g_read (lua_State *L, Lua::LuaFileProxy *f, int first) {
  int nargs = lua_gettop(L) - 1;
  int success;
  int n;
  clearerr(f);
  if (nargs == 0) {  // no arguments?
    success = read_line(L, f);
    n = first+1;  // to return 1 result
  }
  else {  // ensure stack space for all results and for auxlib's buffer
    luaL_checkstack(L, nargs+LUA_MINSTACK, "too many arguments");
    success = 1;
    for (n = first; nargs-- && success; n++) {
      if (lua_type(L, n) == LUA_TNUMBER) {
        size_t l = (size_t)lua_tointeger(L, n);
        success = (l == 0) ? test_eof(L, f) : read_chars(L, f, l);
      }
      else {
        const char *p = lua_tostring(L, n);
        luaL_argcheck(L, p && p[0] == '*', n, "invalid option");
        switch (p[1]) {
          case 'n':  // number
            success = read_number(L, f);
            break;
          case 'l':  // line
            success = read_line(L, f);
            break;
          case 'a':  // file
            read_chars(L, f, ~((size_t)0));  // read MAX_SIZE_T chars
            success = 1; // always success
            break;
          default:
            return luaL_argerror(L, n, "invalid format");
        }
      }
    }
  }
  if (ferror(f))
    return pushresult(L, 0, NULL);
  if (!success) {
    lua_pop(L, 1);  // remove last result
    lua_pushnil(L);  // push nil instead
  }
  return n - first;
}
*/

static int io_read (lua_State *L) {
  error("LUA I/O has been removed in ScummVM");
//  return g_read(L, getiofile(L, IO_INPUT), 1);
}


static int f_read (lua_State *L) {
  error("LUA I/O has been removed in ScummVM");
//  return g_read(L, tofile(L), 2);
}


static int io_readline (lua_State *L) {
  error("LUA I/O has been removed in ScummVM");
/*
  FILE *f = *(FILE **)lua_touserdata(L, lua_upvalueindex(1));
  int success;
  if (f == NULL)  // file is already closed?
    luaL_error(L, "file is already closed");
  success = read_line(L, f);
  if (ferror(f))
    return luaL_error(L, "%s", "LUA I/O error descriptions have been removed in ScummVM");
  if (success) return 1;
  else {  // EOF
    if (lua_toboolean(L, lua_upvalueindex(2))) {  // generator created file?
      lua_settop(L, 0);
      lua_pushvalue(L, lua_upvalueindex(1));
      aux_close(L);  // close it
    }
    return 0;
  }
*/
}

/* }====================================================== */


static int g_write (lua_State *L, Lua::LuaFileProxy *f, int arg) {
  int nargs = lua_gettop(L) - 1;
  int status = 1;
  for (; nargs--; arg++) {
    if (lua_type(L, arg) == LUA_TNUMBER) {
      // optimization: could be done exactly as for strings
	  if (status) {
		char buffer[22];
		snprintf(buffer, 22, LUA_NUMBER_FMT, lua_tonumber(L, arg));
		status = f->write(buffer, strlen(buffer)) == strlen(buffer);
	  }
	}
    else {
      size_t l;
      const char *s = luaL_checklstring(L, arg, &l);
      status = status && (f->write(s, l) == l);
    }
  }
  return pushresult(L, status, NULL);
}


static int io_write (lua_State *L) {
  error("LUA I/O has been removed in ScummVM");
//  return g_write(L, getiofile(L, IO_OUTPUT), 1);
}


static int f_write (lua_State *L) {
  return g_write(L, tofile(L), 2);
}


static int f_seek (lua_State *L) {
  error("LUA I/O has been removed in ScummVM");
  /*
  static const int mode[] = {SEEK_SET, SEEK_CUR, SEEK_END};
  static const char *const modenames[] = {"set", "cur", "end", NULL};
  FILE *f = tofile(L);
  int op = luaL_checkoption(L, 2, "cur", modenames);
  long offset = luaL_optlong(L, 3, 0);
  op = fseek(f, offset, mode[op]);
  if (op)
    return pushresult(L, 0, NULL);  // error
  else {
    lua_pushinteger(L, ftell(f));
    return 1;
  }
*/
}


static int f_setvbuf (lua_State *L) {
  error("LUA I/O has been removed in ScummVM");
  /*
  static const int mode[] = {_IONBF, _IOFBF, _IOLBF};
  static const char *const modenames[] = {"no", "full", "line", NULL};
  FILE *f = tofile(L);
  int op = luaL_checkoption(L, 2, NULL, modenames);
  lua_Integer sz = luaL_optinteger(L, 3, LUAL_BUFFERSIZE);
  int res = setvbuf(f, NULL, mode[op], sz);
  return pushresult(L, res == 0, NULL);
  */
}



static int io_flush (lua_State *L) {
  error("LUA I/O has been removed in ScummVM");
//  return pushresult(L, fflush(getiofile(L, IO_OUTPUT)) == 0, NULL);
}


static int f_flush (lua_State *L) {
  error("LUA I/O has been removed in ScummVM");
//  return pushresult(L, fflush(tofile(L)) == 0, NULL);
}


static const luaL_Reg iolib[] = {
  {"close", io_close},
  {"flush", io_flush},
  {"input", io_input},
  {"lines", io_lines},
  {"open", io_open},
  {"output", io_output},
  {"popen", io_popen},
  {"read", io_read},
  {"tmpfile", io_tmpfile},
  {"type", io_type},
  {"write", io_write},
  {NULL, NULL}
};


static const luaL_Reg flib[] = {
  {"close", io_close},
  {"flush", f_flush},
  {"lines", f_lines},
  {"read", f_read},
  {"seek", f_seek},
  {"setvbuf", f_setvbuf},
  {"write", f_write},
  {"__gc", io_gc},
  {"__tostring", io_tostring},
  {NULL, NULL}
};


static void createmeta (lua_State *L) {
  luaL_newmetatable(L, LUA_FILEHANDLE);  /* create metatable for file handles */
  lua_pushvalue(L, -1);  /* push metatable */
  lua_setfield(L, -2, "__index");  /* metatable.__index = metatable */
  luaL_register(L, NULL, flib);  /* file methods */
}

/*
static void createstdfile (lua_State *L, FILE *f, int k, const char *fname) {
  *newfile(L) = f;
  if (k > 0) {
    lua_pushvalue(L, -1);
    lua_rawseti(L, LUA_ENVIRONINDEX, k);
  }
  lua_pushvalue(L, -2);  // copy environment
  lua_setfenv(L, -2);  // set it
  lua_setfield(L, -3, fname);
}
*/

static void newfenv (lua_State *L, lua_CFunction cls) {
  lua_createtable(L, 0, 1);
  lua_pushcfunction(L, cls);
  lua_setfield(L, -2, "__close");
}


LUALIB_API int luaopen_io (lua_State *L) {
  createmeta(L);
  /* create (private) environment (with fields IO_INPUT, IO_OUTPUT, __close) */
  newfenv(L, io_fclose);
  lua_replace(L, LUA_ENVIRONINDEX);
  /* open library */
  luaL_register(L, LUA_IOLIBNAME, iolib);
  /* create (and set) default files */
  newfenv(L, io_noclose);  /* close function for default files */
/*
  createstdfile(L, stdin, IO_INPUT, "stdin");
  createstdfile(L, stdout, IO_OUTPUT, "stdout");
  createstdfile(L, stderr, 0, "stderr");
*/
  lua_pop(L, 1);  /* pop environment for default files */
  lua_getfield(L, -1, "popen");
  newfenv(L, io_pclose);  /* create environment for 'popen' */
  lua_setfenv(L, -2);  /* set fenv for 'popen' */
  lua_pop(L, 1);  /* pop 'popen' */
  return 1;
}