interpreter.lua

-- Interpreter = 18
-- Controller = 12
local CONTROLLER = 12

local has_no_fuel = false
local performing_task = false

local function handleControllerMessage(msg)
    -- Received as value - 5
    if msg == "bake_bread" then
        redstone.setAnalogOutput("front", 10)
    elseif msg == "farm" then
        redstone.setAnalogOutput("front", 11)
    end

    sleep(5)
    redstone.setOutput("front", false)
end

local function handleController()
    local res = rednet.receive(1)
    if not res then
        return
    end
    local id, msg = res

    if id == CONTROLLER then
        handleControllerMessage(msg)
    end
end

local function send_has_fuel()
    rednet.send(CONTROLLER, "has_fuel")
end

local function send_has_no_fuel()
    rednet.send(CONTROLLER, "has_no_fuel")
end

local function send_performing_task()
    rednet.send(CONTROLLER, "performing_task")
end

local function send_done_task()
    rednet.send(CONTROLLER, "done_task")
end

local function handleBot()
    local val = redstone.getAnalogInput("front")
    if val == 11 then
        -- No fuel, tell the controller
        if has_no_fuel then
            -- Already sent message
            return
        end
        has_no_fuel = true
        send_has_no_fuel()
    elseif val == 10 then
        -- Busy performing task
        if performing_task then
            -- Already sent message
            return
        end
        performing_task = true
        send_performing_task()
    elseif val == 0 and has_no_fuel then
        -- Changed to having fuel
        has_no_fuel = false
        send_has_fuel()
    elseif val == 9 and performing_task then
        -- Done with task
        performing_task = false
        send_done_task()
    elseif val == 8 then
        -- Ready
        rednet.send(CONTROLLER, "ready")
    end
end

local function interpret()
    while true do
        handleBot()
        handleController()
    end
end

local function init()
    rednet.open("right")
    interpret()
end

init()