/*!A cross-platform build utility based on Lua
 *
 * 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.
 *
 * Copyright (C) 2015-present, Xmake Open Source Community.
 *
 * @author      ruki
 * @file        signal.c
 *
 */

/* //////////////////////////////////////////////////////////////////////////////////////
 * trace
 */
#define TB_TRACE_MODULE_NAME "signal"
#define TB_TRACE_MODULE_DEBUG (0)

/* //////////////////////////////////////////////////////////////////////////////////////
 * includes
 */
#include "prefix.h"
#if defined(TB_CONFIG_OS_MACOSX) || defined(TB_CONFIG_OS_IOS)
#include <unistd.h>
#include <signal.h>
#elif defined(TB_CONFIG_OS_LINUX) || defined(TB_CONFIG_OS_BSD) || defined(TB_CONFIG_OS_ANDROID) ||                     \
    defined(TB_CONFIG_OS_HAIKU)
#include <unistd.h>
#include <signal.h>
#endif
#ifdef TB_CONFIG_OS_BSD
#include <sys/types.h>
#include <sys/sysctl.h>
#include <signal.h>
#endif

/* //////////////////////////////////////////////////////////////////////////////////////
 * types
 */
typedef enum __xm_os_signal_e {
    XM_OS_SIGINT = 2
} xm_os_signal_e;

typedef enum __xm_os_signal_handler_e {
    XM_OS_SIGFUN = 0,
    XM_OS_SIGDFL = 1,
    XM_OS_SIGIGN = 2,
} xm_os_signal_handler_e;

/* //////////////////////////////////////////////////////////////////////////////////////
 * globals
 */
static lua_State *g_lua = tb_null;

/* //////////////////////////////////////////////////////////////////////////////////////
 * private implementation
 */
static tb_void_t xm_os_signal_handler_impl(tb_int_t signo) {
    // do callback(signo)
    lua_State *lua = g_lua;
    if (lua) {
        tb_char_t name[64] = { 0 };
        tb_snprintf(name, sizeof(name), "_SIGNAL_HANDLER_%d", signo);
        lua_getglobal(lua, name);
        lua_pushinteger(lua, signo);
        lua_call(lua, 1, 0);
    }
}

#if defined(TB_CONFIG_OS_WINDOWS)
static BOOL WINAPI xm_os_signal_handler(DWORD ctrl_type) {
    if (ctrl_type == CTRL_C_EVENT) {
        xm_os_signal_handler_impl(XM_OS_SIGINT);
    }
    return TRUE;
}
#elif defined(SIGINT)
static tb_void_t xm_os_signal_handler(tb_int_t signo_native) {
    tb_int_t signo = -1;
    switch (signo_native) {
    case SIGINT:
        signo = XM_OS_SIGINT;
        break;
    default:
        break;
    }
    if (signo >= 0) {
        xm_os_signal_handler_impl(signo);
    }
}
#endif

/* //////////////////////////////////////////////////////////////////////////////////////
 * implementation
 */
tb_int_t xm_os_signal(lua_State *lua) {
    tb_assert_and_check_return_val(lua, 0);
    g_lua            = lua;
    tb_int_t handler = XM_OS_SIGFUN;

    // check signal handler
    if (lua_isnumber(lua, 2)) {
        handler = (tb_int_t)luaL_checkinteger(lua, 2);
    } else if (!lua_isfunction(lua, 2)) {
        return 0;
    }

    // save signal handler
    tb_int_t signo = (tb_int_t)luaL_checkinteger(lua, 1);
    if (handler == XM_OS_SIGFUN) {
        tb_char_t name[64] = { 0 };
        tb_snprintf(name, sizeof(name), "_SIGNAL_HANDLER_%d", signo);
        lua_pushvalue(lua, 2);
        lua_setglobal(lua, name);
    }

#if defined(TB_CONFIG_OS_WINDOWS)
    if (signo != XM_OS_SIGINT) {
        return 0;
    }

    switch (handler) {
    case XM_OS_SIGFUN:
        SetConsoleCtrlHandler(xm_os_signal_handler, TRUE);
        break;
    case XM_OS_SIGDFL:
        SetConsoleCtrlHandler(NULL, FALSE);
        break;
    case XM_OS_SIGIGN:
        SetConsoleCtrlHandler(NULL, TRUE);
        break;
    default:
        break;
    }
#elif defined(SIGINT)
    switch (signo) {
    case XM_OS_SIGINT:
        signo = SIGINT;
        break;
    default:
        return 0;
    }

    switch (handler) {
    case XM_OS_SIGFUN:
        signal(signo, xm_os_signal_handler);
        break;
    case XM_OS_SIGDFL:
        signal(signo, SIG_DFL);
        break;
    case XM_OS_SIGIGN:
        signal(signo, SIG_IGN);
        break;
    default:
        break;
    }
#endif
    return 0;
}