term.clear()
term.setCursorPos(1,1)

repeat
print("Enter tunnel Length (even number): ")
length = read()
print("Enter height (even number): ")
height = read()
print("Enter Width (even number): ")
width = read()
until length % 2 == 0
term.clear()
repeat
print("Place fuel in slot 1.")
until turtle.getItemCount(1) >= 0
repeat
print("Place torches in slot 2.")
until turtle.getItemCount(2) ~= 0

print("Place chest behind turtle.\n")

term.clear()
print("Here we go!")
torchpos = 0


function fuel()
    if turtle.getFuelLevel() < 0.26 then
        turtle.select(1)
        turtle.refuel(1)
    end
end

function mine()
    local LoopHeight = 0
    local LoopWidth = 0
    local LoopLength = 0

    fuel()
--odd numbers left even numbers right
    for LoopLength = 0, length -1 do
        for LoopHeight = 0, height - 1 do
            if LoopHeight % 2 == 0 then
                turtle.turnLeft()
                for LoopWidth = 0, width -1 do
                    leftUp()
                end
                turtle.turnRight()
            else
                turtle.turnRight()
                for LoopWidth = 0, width -1 do
                    rightUp()
                end
                turtle.turnLeft()
            end
            if LoopWidth == width -1 then
                if LoopWidth % 2 == 0 then
                    turtle.turnRight()
                else
                    turtle.turnLeft()
                end
print("move forward")
                checkEmptySpace()
                turtle.forward()
            else
print("Down")
                if turtle.detectDown() == true then
                    turtle.digDown()
                end
                turtle.down()
            end
        end
    if LoopLength % 2 == 0 then
        turtle.turnRight()
    else
        turtle.turnLeft()
    end

    end
end


function checkEmptySpace()
    while turtle.detect() == true do
        turtle.dig()
    end
end

function leftUp()

    checkEmptySpace()
    turtle.forward()

end

function rightUp()
    checkEmptySpace()
    turtle.forward()
end

mine()