Announcer

--[[
Copyright Oliver Marks 2018

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

Modifications must be reported to the copyright holder, Oliver Marks.

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
]]

local chat = peripheral.find "chat_box"
local radar = peripheral.find "radar"
local checkForSpam = false
chat.setDistance(math.huge)

rednet.open "top"

-- A primitive spam filter. Respects checkForSpam variable
function isSpam(msg, usr)
    if not checkForSpam then return false end

    if usr == "TerraInc" or string.find(msg, "TerraInc") then return true end

    return false
end

-- Listens to rednet & broadcasts to chat
function rednetListen()
    while true do
        -- DAG Protocol: Rednet -> Chat
        local _, rawMsg = rednet.receive "chat_announce"
        local msg, usr = nil, "Announcer"
        if type(rawMsg) == "table" then
            if rawMsg[1] and rawMsg[2] then
                usr = rawMsg[1]
                msg = rawMsg[2]
            end
        else
            -- Support for old string-only protocol
            msg = tostring(rawMsg)
        end

        if not isSpam(msg, usr) then
            chat.setName(usr)
            chat.say(msg)
            lastMessage = msg
        end
    end
end

-- Listen to chat and broadcast on rednet.
function chatListen()
    while true do
        local _, _, username, msg = os.pullEvent "chat_message"
        -- For debugging
        print(username, msg)

        -- Reverse messages from TheDacinator.
        if username == "TheDacinator" then
            msg = string.reverse(msg)
        end

        -- DAG Protocol - Chat -> Rednet
        rednet.broadcast({username, msg}, "chat_message")
    end
end

-- Detect items dropped on the ground.
function detectLittering()
    local hasAnnouncedAlready = false

    while true do
        local items = radar.getItems()
        if #items > 0 then
            if not hasAnnouncedAlready then
                local players = radar.getPlayers()

                local item = items[1]
                local msg = "Littering Detected. The item littered is: " .. item.label .. ". "

                if players[1] then
                    local name = players[1].name
                    if name == "osmarks" then name = "nagoL2015" end
                    msg = msg .. name .. " was detected at the crime scene."
                end
                if item.label ~= "Egg" then
                    chat.setName "TidyStreet5000"
                    chat.say(msg)
                    rednet.broadcast({"TidyStreet5000", msg}, "chat_announce")
                    hasAnnouncedAlready = true
                end
            end
        else
            hasAnnouncedAlready = false
        end

        sleep(0.5)
    end
end

-- Listens to DAG commands.
function commandListen()
    local _, cmd = rednet.receive "announcer_command"

    if cmd == "reboot" then
        chat.setName "Announcer"
        chat.say "This node is rebooting."
        os.reboot()
    end
end

-- Transmit player location data
function scanForPlayers()
    local x, y, z = gps.locate()

    while true do
        local players = radar.getPlayers()

        for _, p in pairs(players) do
            p.x = p.x + x
            p.y = p.y + y
            p.z = p.z + z

            p.time = os.time()
            p.day = os.day()

            rednet.broadcast(p, "player_tracking")
        end

        sleep(1)
    end
end

-- Relays GPS. May not be very accurate as it will just amplify errors in existing GPS host systems.
function gpsRelay()
    print "Hosting GPS."
    shell.run "gps host"
end

pcall(function()
    parallel.waitForAll(chatListen, rednetListen, commandListen)
end)

sleep(10)

os.reboot()