function split(s, delimiter)
    result = {};
    for match in (s..delimiter):gmatch("(.-)"..delimiter) do
        table.insert(result, match);
    end
    return result;
end

local function redstoneUpdate()

    local spawnersInactive = {};
    for _,spawnerItem in pairs(spawners) do

        if(not spawnerItem["isActive"]) then

            local redstoneSpawner = spawnerItem["redstone"];
            local spawnerSide = tostring(redstoneSpawner[1]);
            local spawnerColor = tonumber(redstoneSpawner[2]);

            local oldValue = (spawnersInactive[spawnerSide] == nil and 0 or tonumber(spawnersInactive[spawnerSide]));
            spawnersInactive[spawnerSide] = oldValue + spawnerColor;
        end
    end

    if(#spawnersInactive == 0 then

        redstone.setBundledOutput("right", 131070);
        redstone.setBundledOutput("back", 131070);
    else
        for side,totalColor in pairs(spawnersInactive) do
            redstone.setBundledOutput(side, totalColor);
        end
    end
end

spawners = {
    {
        name = "Blaze",
        isActive = false,
        redstone = {"front", colors.yellow}
    },
    {
        name = "Enderman",
        isActive = false,
        redstone = {"front", colors.black}
    }
};

redstoneUpdate();

local modem = peripheral.wrap("left");
modem.open(3);

while true do

    local event, modemSide, senderChannel, replyChannel, message, senderDistance = os.pullEvent("modem_message");

    local args = split(tostring(message), ":");

    if(message == "spawnerGet") then
        modem.transmit(1, 3, spawners);
    elseif(message:find("spawnerActivate")) then

        local indexFuturChange = tonumber(args[2]);
        local currentSpawner = spawners[indexFuturChange];

        spawners[indexFuturChange]["isActive"] = not spawners[indexFuturChange]["isActive"];
        redstoneUpdate(spawners);

        modem.transmit(1, 3, spawners);

    elseif(message:find("spawnerOff")) then

        for _,spawner in pairs(spawners) do
            spawner["isActive"] = false;
        end

        redstone.setBundledOutput("right", 131070);
        redstone.setBundledOutput("back", 131070);

        modem.transmit(1, 3, spawners);
    else
        print("ici error");
        print(message);
    end
end