/*
 *  Copyright 2014 The Luvit Authors. All Rights Reserved.
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 */

#include "luv.h"

static uv_fs_poll_t* luv_check_fs_poll(lua_State* L, int index) {
  uv_fs_poll_t* handle = (uv_fs_poll_t*)luv_checkudata(L, index, "uv_fs_poll");
  luaL_argcheck(L, handle->type == UV_FS_POLL && handle->data, index, "Expected uv_fs_poll_t");
  return handle;
}

static int luv_new_fs_poll(lua_State* L) {
  uv_fs_poll_t* handle = (uv_fs_poll_t*)luv_newuserdata(L, sizeof(*handle));
  int ret = uv_fs_poll_init(luv_loop(L), handle);
  if (ret < 0) {
    lua_pop(L, 1);
    return luv_error(L, ret);
  }
  handle->data = luv_setup_handle(L);
  return 1;
}

static void luv_fs_poll_cb(uv_fs_poll_t* handle, int status, const uv_stat_t* prev, const uv_stat_t* curr) {
  lua_State* L = luv_state(handle->loop);

  // err
  luv_status(L, status);

  // prev
  if (prev) {
    luv_push_stats_table(L, prev);
  }
  else {
    lua_pushnil(L);
  }

  // curr
  if (curr) {
    luv_push_stats_table(L, curr);
  }
  else {
    lua_pushnil(L);
  }

  luv_call_callback(L, (luv_handle_t*)handle->data, LUV_FS_POLL, 3);
}

static int luv_fs_poll_start(lua_State* L) {
  uv_fs_poll_t* handle = luv_check_fs_poll(L, 1);
  const char* path = luaL_checkstring(L, 2);
  unsigned int interval = luaL_checkinteger(L, 3);
  int ret;
  luv_check_callback(L, (luv_handle_t*)handle->data, LUV_FS_POLL, 4);
  ret = uv_fs_poll_start(handle, luv_fs_poll_cb, path, interval);
  if (ret < 0) return luv_error(L, ret);
  lua_pushinteger(L, ret);
  return 1;
}

static int luv_fs_poll_stop(lua_State* L) {
  uv_fs_poll_t* handle = luv_check_fs_poll(L, 1);
  int ret = uv_fs_poll_stop(handle);
  if (ret < 0) return luv_error(L, ret);
  lua_pushinteger(L, ret);
  return 1;
}

static int luv_fs_poll_getpath(lua_State* L) {
  uv_fs_poll_t* handle = luv_check_fs_poll(L, 1);
  size_t len = 2*PATH_MAX;
  char buf[2*PATH_MAX];
  int ret = uv_fs_poll_getpath(handle, buf, &len);
  if (ret < 0) return luv_error(L, ret);
  lua_pushlstring(L, buf, len);
  return 1;
}