--!A cross-platform build utility based on Lua
--
-- Licensed to the Apache Software Foundation (ASF) under one
-- or more contributor license agreements.  See the NOTICE file
-- distributed with this work for additional information
-- regarding copyright ownership.  The ASF licenses this file
-- to you 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 - 2017, TBOOX Open Source Group.
--
-- @author      ruki
-- @file        ping.lua
--

-- imports
import("detect.tools.find_ping")

-- send ping to hosts
--
-- @param ...   the hosts
--
-- @return      the time or -1
--
function main(...)

    -- find ping
    local ping = find_ping()
    if not ping then
        return {}
    end

    -- run tasks
    local hosts = {...}
    local results = {}
    process.runjobs(function (index)
        local host = hosts[index]
        if host then
            try
            {
                function ()

                    -- ping it
                    local data = nil
                    if os.host() == "windows" then
                        data = os.iorun("%s -n 1 %s", ping, host)
                    else
                        data = os.iorun("%s -c 1 %s", ping, host)
                    end

                    -- find time
                    local time = data:match("time=(.-)ms", 1, true)
                    if time then
                        results[host] = tonumber(time:trim())
                    end
                end
            }
        end
    end, #hosts)

    -- ok?
    return results
end