Computercraft Geoscanner Turtle (Does not currently work)

local scanner = peripheral.find("geoscanner")
local fuel = turtle.getFuelLevel()
print("What block to mine?")
local search = io.read()
local direction = 0
local offset = {0, 0, 0}

function turnRight()
    turtle.turnRight()
    direction += 1
    if direction > 3 then
        direction = 0
    end
end
function turnLeft()
    turtle.turnLeft()
    direction += 1
    if direction < 0 then
        direction = 3
    end
end

function moveX(distance)
    if distance > 0 then
        if direction == 0 then
            turnRight()
        elseif direction == 3 then
            turnRight()
            turnRight()
        if direction == 2 then
            turnLeft()
        end
    else
        if direction == 0 then
            turnLeft()
        elseif direction == 2 then
            turnRight()
        if direction == 1 then
            turnRight()
            turnRight()
        end
    end
    for a = 1, distance do
        turtle.dig()
        turtle.forward()
        offset = {offset[x]+(math.abs(distance)/distance), offset[y], offset[z]}
    end
end

function moveZ(distance)
    if distance > 0 then
        if direction == 1 then
            turnRight()
        elseif direction == 3 then
            turnLeft()
        if direction == 0 then
            turnRight()
            turnRight()
        end
    else
        if direction == 2 then
            turnRight()
        elseif direction == 0 then
            turnLeft()
        if direction == 1 then
            turnRight()
            turnRight()
        end
    end
    for a = 1, distance do
        turtle.dig()
        turtle.forward()
        offset = {offset[x], offset[y], offset[z]+(math.abs(distance)/distance)}
    end
end

function moveY(distance)
    if distance > 0 then
        turtle.digUp()
        turtle.up()
        {offset[x], offset[y]+1, offset[z]}
    else
        turtle.digDown()
        turtle.down()
        {offset[x], offset[y]-1, offset[z]}
    end
end

function Move(vector)
    moveX(vector[1])
    moveY(vector[2])
    moveZ(vector[3])
end

Move(1, 1, 1)