TurtleDig

--mine, itself dimensions--
xMine = 0
zMine = 0
yMine = 0

posTot = 0
--every forward movement in the X adds to this--
posX = 0

--every forward movement in the Y adds to this--
posZ = 0

--homeX and homeZ for custom coords later--
homeX = 0
homeZ = 0

-- for dirFind--
--pos = forward in the x from home --
--neg = backward in the x from the home--
dirFind = 1
height = 0


fuelLevel = turtle.getFuelLevel()

function posZlayer()

    while (posZ < zMine) do
    turtle.dig()
    turtle.forward()
    posZ = posZ + 1
    print(posZ)
    turtle.digUp()
    end

end

function negZlayer()

    while (posZ > 0) do
    turtle.dig()
    turtle.forward()
    posZ = posZ - 1
    turtle.digUp()
    print("finished negZ layer")
    end


end

function nextXlayer()
    if(dirFind == 1) then
        turtle.turnRight()
        turtle.dig()
        turtle.forward()
        turtle.digUp()
        turtle.turnRight()
        posX = posX + 1
    else
        turtle.turnLeft()
        turtle.dig()
        turtle.forward()
        turtle.digUp()
        turtle.turnLeft()
        posX = posX + 1

    end

end

function entries()

--height entry--
    print "enter the current Y height"
    height = tonumber(read())

--mine dimensions entry--
    print("enter the x dimension of the mine")
    xMine = tonumber(read())
    print("enter the z dimension of the mine")
    zMine = tonumber(read())
    print("enter the ceiling height of the mine(even numbers only)")
    yMine = tonumber(read())

end

function digDown()
    while(height > 11) do
    turtle.digDown()
    turtle.dig()
    turtle.down()
    height = height - 1
   end
end


function returnHome()

    if(dirFind == 1) then

        turtle.turnLeft()
        else
        turtle.turnRight()
end

while(homeX < posX) do
    turtle.forward()
    posX = posX - 1
end

while(homeZ < posZ) do
    turtle.forward()
    posZ = posZ - 1
    end

end


function diggydiggyhole()
    entries()
    digDown()



        while(posX <= xMine) do
        posTot = posX + posZ
            if(fuelLevel < posTot) then
            returnHome()
            end

        if(dirFind == 1) then
            print("poslayer started")
            posZlayer()
            nextXlayer()
            print("layer done")
            dirFind = 2
        else
            print("neglayer started")
            negZlayer()
            nextXlayer()
            dirFind = 1

         end
    end
end


--order of operations--

diggydiggyhole()