/*
 *  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 "private.h"

static uv_fs_event_t* luv_check_fs_event(lua_State* L, int index) {
  uv_fs_event_t* handle = (uv_fs_event_t*)luv_checkudata(L, index, "uv_fs_event");
  luaL_argcheck(L, handle->type == UV_FS_EVENT && handle->data, index, "Expected uv_fs_event_t");
  return handle;
}

static int luv_new_fs_event(lua_State* L) {
  luv_ctx_t* ctx = luv_context(L);
  uv_fs_event_t* handle = (uv_fs_event_t*)luv_newuserdata(L, uv_handle_size(UV_FS_EVENT));
  int ret = uv_fs_event_init(ctx->loop, handle);
  if (ret < 0) {
    lua_pop(L, 1);
    return luv_error(L, ret);
  }
  handle->data = luv_setup_handle(L, ctx);
  return 1;
}

static void luv_fs_event_cb(uv_fs_event_t* handle, const char* filename, int events, int status) {
  luv_handle_t* data = (luv_handle_t*)handle->data;
  lua_State* L = data->ctx->L;

  // err
  luv_status(L, status);

  // filename
  lua_pushstring(L, filename);

  // events
  lua_newtable(L);
  if (events & UV_RENAME) {
    lua_pushboolean(L, 1);
    lua_setfield(L, -2, "rename");
  }
  if (events & UV_CHANGE) {
    lua_pushboolean(L, 1);
    lua_setfield(L, -2, "change");
  }

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

static int luv_fs_event_start(lua_State* L) {
  uv_fs_event_t* handle = luv_check_fs_event(L, 1);
  const char* path = luaL_checkstring(L, 2);
  int flags = 0, ret;
  luaL_checktype(L, 3, LUA_TTABLE);
  lua_getfield(L, 3, "watch_entry");
  if (lua_toboolean(L, -1)) flags |= UV_FS_EVENT_WATCH_ENTRY;
  lua_pop(L, 1);
  lua_getfield(L, 3, "stat");
  if (lua_toboolean(L, -1)) flags |= UV_FS_EVENT_STAT;
  lua_pop(L, 1);
  lua_getfield(L, 3, "recursive");
  if (lua_toboolean(L, -1)) flags |= UV_FS_EVENT_RECURSIVE;
  lua_pop(L, 1);
  luv_check_callback(L, (luv_handle_t*)handle->data, LUV_FS_EVENT, 4);
  ret = uv_fs_event_start(handle, luv_fs_event_cb, path, flags);
  return luv_result(L, ret);
}

static int luv_fs_event_stop(lua_State* L) {
  uv_fs_event_t* handle = luv_check_fs_event(L, 1);
  int ret = uv_fs_event_stop(handle);
  return luv_result(L, ret);
}

static int luv_fs_event_getpath(lua_State* L) {
  uv_fs_event_t* handle = luv_check_fs_event(L, 1);
  size_t len = 2*PATH_MAX;
  char buf[2*PATH_MAX];
  int ret = uv_fs_event_getpath(handle, buf, &len);
  if (ret < 0) return luv_error(L, ret);
  lua_pushlstring(L, buf, len);
  return 1;
}