local modem = peripheral.find("modem", rednet.open);

local idFilename = "id"

local protocol = "Potion_Brewer_BELT_SELECTOR"
local logging = "Potion_Brewer_LOGGER"

local id = ""

function log(string)
    print(string)
    rednet.broadcast("[BELT_SELECTOR_"..id.."] "..string, logging)
end

function init()

    -- get this selectors id
    local idFile = fs.open(idFilename, "r")
    if idFile then
        id = idFile.readAll()
        idFile.close()
    else
        log("failed to open item file: "..idFilename)
    end

    log("ID file loaded, this selector is: "..id)

    rednet.host(protocol, id)

    --wait for an event to dispense the item
    while true do
        --receive messages
        local senderID, message = rednet.receive(protocol)
        print(message)

        local eventName = "EVENT_BELT_SELECT_"..id

        if string.find(message, eventName) then
            --get the setting value
            log("attemting to set belt selection")

            local setting = string.sub(message, #eventName + 1, #message)
            setting = tonumber(setting)

            -- select the belt
            rs.setAnalogOutput("back", setting)

            --respond with a dispense started event
            rednet.broadcast("EVENT_BELT_SELECT_FINNISHED_" .. id .. " " .. setting, protocol)
            log("selected belt: " .. setting)
        end
    end
end

init()