local lampslot = 1
local modemslot = 5
local cableslot = 9


local move = function(f)
    if turtle.getFuelLevel() < 1 then
        print("Low on fuel. Please add fuel to my inventory.")
        while turtle.getFuelLevel() < 1 do
            os.sleep(5)
            print("Checking for fuel...")
            shell.run("refuel all")
        end
    end
    while not f() do
        sleep(0.3)
    end
    sleep(0.1)
end


local assemble = function()
    move(closer)
    while turtle.getItemCount(lampslot) < 1 do
        lampslot = lampslot + 1
        if lampslot > 4 then
            print("Out of Illuminators, please put more on the first row and press return.")
            lampslot = 1
            local e,c = os.pullEvent("key")
            while c ~= 28 do
                e,c = os.pullEvent("key")
            end
        end
    end
    turtle.select(lampslot)
    place()
    click()
    move(away)
    while turtle.getItemCount(modemslot) < 1 do
        modemslot = modemslot + 1
        if modemslot > 8 then
            print("Out of modems, please put more on the second row and press return.")
            modemslot = 5
            local e,c = os.pullEvent("key")
            while c ~= 28 do
                e,c = os.pullEvent("key")
            end
        end
    end
    turtle.select(modemslot)
    place()
    while turtle.getItemCount(cableslot) < 1 do
        cableslot = cableslot + 1
        if cableslot > 12 then
            print("Out of cable, please put more on the third row and press return.")
            cableslot = 9
            local e,c = os.pullEvent("key")
            while c ~= 28 do
                e,c = os.pullEvent("key")
            end
        end
    end
    turtle.select(cableslot)
    place()
    click()
end


width,height = 16,16
column,row = 1,height

ascend = turtle.up
descend = turtle.down
closer = turtle.forward
away = turtle.back
click = turtle.attack
place = turtle.place

--[[
ascend = turtle.forward
descend = turtle.back
closer = turtle.down
away = turtle.back
click = turtle.attackDown
place = turtle.placeDown
--]]


print("Good to go!")
print(string.format("The process will take around %f minutes to finish.",(2.5*height*width)/60))
print("Press return to begin.")
e,c = os.pullEvent("key")
while c ~= 28 do
    e,c = os.pullEvent("key")
end

print("Starting...")

turtle.select(1)
while true do
    if column > width then break end
    assemble()
    while row > 1 do
        move(ascend)
        row = row - 1
        assemble()
    end
    turtle.turnLeft()
    move(turtle.forward)
    turtle.turnRight()
    column = column + 1
    if column > width then break end
    assemble()
    while row < height do
        move(descend)
        row = row + 1
        assemble()
    end
    turtle.turnLeft()
    move(turtle.forward)
    turtle.turnRight()
    column = column + 1
end

if width % 2 == 1 then
    for i=1,height-1 do
        move(descend)
    end
end