/*
 *  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_poll_t* luv_check_poll(lua_State* L, int index) {
  uv_poll_t* handle = (uv_poll_t*)luv_checkudata(L, index, "uv_poll");
  luaL_argcheck(L, handle->type == UV_POLL && handle->data, index, "Expected uv_poll_t");
  return handle;
}

static int luv_new_poll(lua_State* L) {
  luv_ctx_t* ctx = luv_context(L);
  int fd = luaL_checkinteger(L, 1);
  uv_poll_t* handle = (uv_poll_t*)luv_newuserdata(L, uv_handle_size(UV_POLL));
  int ret = uv_poll_init(ctx->loop, handle, fd);
  if (ret < 0) {
    lua_pop(L, 1);
    return luv_error(L, ret);
  }
  handle->data = luv_setup_handle(L, ctx);
  return 1;
}

static int luv_new_socket_poll(lua_State* L) {
  luv_ctx_t* ctx = luv_context(L);
  int fd = luaL_checkinteger(L, 1);
  uv_poll_t* handle = (uv_poll_t*)luv_newuserdata(L, uv_handle_size(UV_POLL));
  int ret = uv_poll_init_socket(ctx->loop, handle, fd);
  if (ret < 0) {
    lua_pop(L, 1);
    return luv_error(L, ret);
  }
  handle->data = luv_setup_handle(L, ctx);
  return 1;
}

static const char *const luv_pollevents[] = {
  "r", "w", "rw",
#if LUV_UV_VERSION_GEQ(1, 9, 0)
  "d", "rd", "wd", "rwd",
#endif
#if LUV_UV_VERSION_GEQ(1, 14, 0)
  "p", "rp", "wp", "rwp", "dp", "rdp", "wdp", "rwdp",
#endif
  NULL
};

static void luv_poll_cb(uv_poll_t* handle, int status, int events) {
  luv_handle_t* data = (luv_handle_t*)handle->data;
  lua_State* L = data->ctx->L;
  const char* evtstr;

  if (status < 0) {
    lua_pushstring(L, uv_err_name(status));
  }
  else {
    lua_pushnil(L);
  }

  switch (events) {
    case UV_READABLE: evtstr = "r"; break;
    case UV_WRITABLE: evtstr = "w"; break;
    case UV_READABLE|UV_WRITABLE: evtstr = "rw"; break;
#if LUV_UV_VERSION_GEQ(1, 9, 0)
    case UV_DISCONNECT: evtstr = "d"; break;
    case UV_READABLE|UV_DISCONNECT: evtstr = "rd"; break;
    case UV_WRITABLE|UV_DISCONNECT: evtstr = "wd"; break;
    case UV_READABLE|UV_WRITABLE|UV_DISCONNECT: evtstr = "rwd"; break;
#endif
#if LUV_UV_VERSION_GEQ(1, 14, 0)
    case UV_PRIORITIZED: evtstr = "p"; break;
    case UV_READABLE|UV_PRIORITIZED: evtstr = "rp"; break;
    case UV_WRITABLE|UV_PRIORITIZED: evtstr = "wp"; break;
    case UV_READABLE|UV_WRITABLE|UV_PRIORITIZED: evtstr = "rwp"; break;
    case UV_DISCONNECT|UV_PRIORITIZED: evtstr = "dp"; break;
    case UV_READABLE|UV_DISCONNECT|UV_PRIORITIZED: evtstr = "rdp"; break;
    case UV_WRITABLE|UV_DISCONNECT|UV_PRIORITIZED: evtstr = "wdp"; break;
    case UV_READABLE|UV_WRITABLE|UV_DISCONNECT|UV_PRIORITIZED: evtstr = "rwdp"; break;
#endif
    default: evtstr = ""; break;
  }
  lua_pushstring(L, evtstr);

  luv_call_callback(L, data, LUV_POLL, 2);
}

static int luv_poll_start(lua_State* L) {
  uv_poll_t* handle = luv_check_poll(L, 1);
  int events, ret;
  switch (luaL_checkoption(L, 2, "rw", luv_pollevents)) {
    case 0: events = UV_READABLE; break;
    case 1: events = UV_WRITABLE; break;
    case 2: events = UV_READABLE | UV_WRITABLE; break;
#if LUV_UV_VERSION_GEQ(1, 9, 0)
    case 3: events = UV_DISCONNECT; break;
    case 4: events = UV_READABLE|UV_DISCONNECT; break;
    case 5: events = UV_WRITABLE|UV_DISCONNECT; break;
    case 6: events = UV_READABLE|UV_WRITABLE|UV_DISCONNECT; break;
#endif
#if LUV_UV_VERSION_GEQ(1, 14, 0)
    case 7: events = UV_PRIORITIZED; break;
    case 8: events = UV_READABLE|UV_PRIORITIZED; break;
    case 9: events = UV_WRITABLE|UV_PRIORITIZED; break;
    case 10: events = UV_READABLE|UV_WRITABLE|UV_PRIORITIZED; break;
    case 11: events = UV_DISCONNECT|UV_PRIORITIZED; break;
    case 12: events = UV_READABLE|UV_DISCONNECT|UV_PRIORITIZED; break;
    case 13: events = UV_WRITABLE|UV_DISCONNECT|UV_PRIORITIZED; break;
    case 14: events = UV_READABLE|UV_WRITABLE|UV_DISCONNECT|UV_PRIORITIZED; break;
#endif
    default: events = 0; /* unreachable */
  }
  luv_check_callback(L, (luv_handle_t*)handle->data, LUV_POLL, 3);
  ret = uv_poll_start(handle, events, luv_poll_cb);
  return luv_result(L, ret);
}

static int luv_poll_stop(lua_State* L) {
  uv_poll_t* handle = luv_check_poll(L, 1);
  int ret = uv_poll_stop(handle);
  return luv_result(L, ret);
}