potato

if turtle.getFuelLevel()==0 then
    turtle.refuel(20)
end
MoveCount = 0
Kill = false
PosOffset = {x=0,y=0,z=0}
Forward = {x=1,y=0,z=0}
function shift(direction)
    if direction=="right" then
        print("shifting direction right")
        if Forward.x==1 then
            Forward.x=0
            Forward.z=1
        elseif Forward.z==1 then
            Forward.x=-1
            Forward.z=0
        elseif Forward.x==-1 then
            Forward.x=0
            Forward.z=-1
        elseif Forward.z==-1 then
            Forward.z=0
            Forward.x=1
        end
    end
    if direction=="left" then
        print("shifting direction left")
        if Forward.x==1 then
            Forward.x=0
            Forward.z=-1
        elseif Forward.z==-1 then
            Forward.x=-1
            Forward.z=0
        elseif Forward.x==-1 then
            Forward.x=0
            Forward.z=1
        elseif Forward.z==1 then
            Forward.z=0
            Forward.x=1
        end
    end
end
function GetDirectionFromForward()
    if Forward.x==1 then
        return "forward"
    elseif Forward.x==-1 then
        return "backwards"
    elseif Forward.z==1 then
        return "right"
    elseif Forward.z==-1 then
        return "left"
    end
end
function base(num)
    if num>0 then
        return 1
    elseif num<0 then
        return -1
    else
        return 0
    end
end
function SetDirection(direction)
    if GetDirectionFromForward()~=direction:lower() then
        repeat
            turtle.turnRight()
            shift("right")
        until
            GetDirectionFromForward()==direction:lower()
    end
end
function ShiftOffsetForward()
    PosOffset.x=PosOffset.x+Forward.x
    PosOffset.y=PosOffset.y+Forward.y
    PosOffset.z=PosOffset.z+Forward.z
end
function isore(...)
    local tb = {...}
    if tb and #tb>0 then
        if pcall(function() return tb[2] end) and tb[2].name then
            return tb[2].name:find("ore")~=nil
        end
    end
end
function isoff()
    if PosOffset.x~=0 or PosOffset.y~=0 or PosOffset.z~=0 then
        return true
    end
end
function returnTunnel()
    print("returning to tunnel")
    if PosOffset.x~=0 then
        print('adjusting x')
        repeat
            print("adjusting x to "..(-base(PosOffset.x))..", current = "..Forward.x..","..Forward.z)
            shift("right")
            turtle.turnRight()
        until Forward.x==-base(PosOffset.x)
        repeat
            if turtle.detect() then turtle.dig() end
            turtle.forward()
            local offori = math.abs(PosOffset.x)
            ShiftOffsetForward()
            if math.abs(PosOffset.x) > offori then
                turtle.turnRight()
                turtle.turnRight()
                shift("right")
                shift("right")
            end
        until PosOffset.x==0
    end
    if PosOffset.z~=0 then
        print('adjusting z : '..Forward.z)
        repeat
            print("adjusting z to "..(-base(PosOffset.z))..", current = "..Forward.x..","..Forward.z)
            shift("right")
            turtle.turnRight()
        until Forward.z==-base(PosOffset.z)
        repeat
            if turtle.detect() then turtle.dig() end
            turtle.forward()
            local offori = math.abs(PosOffset.z)
            ShiftOffsetForward()
            if math.abs(PosOffset.z) > offori then
                turtle.turnRight()
                turtle.turnRight()
                shift("right")
                shift("right")
            end
        until PosOffset.z==0
    end
    if PosOffset.y~=0 then
        print('adjusting y')
        if PosOffset.y>0 then
            repeat
                if turtle.detectDown() then turtle.digDown() end
                turtle.down()
                PosOffset.y=PosOffset.y-1
            until PosOffset.y==0
        end
        if PosOffset.y<0 then
            repeat
                if turtle.detectUp() then turtle.digUp() end
                turtle.up()
                PosOffset.y=PosOffset.y+1
            until PosOffset.y==0
        end
    end
    SetDirection("Forward")
    check(true)
end
function check(turn)
    print("checking for ore")
    local cont = true
    local incheck = function()
        if cont and turtle.detectUp() then
            if isore(turtle.inspectUp()) then
                print("FoundUp")
                turtle.digUp()
                turtle.up()
                PosOffset.y = PosOffset.y+1
                check(true)
            end
        end
        if cont and turtle.detectDown() then
            if isore(turtle.inspectDown()) then
                print("FoundDown")
                turtle.digDown()
                turtle.down()
                PosOffset.y = PosOffset.y-1
                check(true)
            end
        end
    end
    incheck()
    if cont and turn then
        print("Turning")
        turtle.turnRight()
        shift("right")
        if cont and turtle.detect() then
            if isore(turtle.inspect()) then
                turtle.dig()
                turtle.forward()
                ShiftOffsetForward()
                cont = false
                check(true)
            end
        end
        if cont then
            turtle.turnLeft();turtle.turnLeft()
            shift("left");shift("left")
            if isore(turtle.inspect()) then
                turtle.dig()
                turtle.forward()
                ShiftOffsetForward()
                cont = false
                check(true)
            end
        end
    end
    if cont and PosOffset.x~=0 or PosOffset.y ~= 0 or PosOffset.z~=0 then
        returnTunnel()
    end
    SetDirection("forward")
end
function mine()
    table.foreach(Forward,print)
    if turtle.getFuelLevel()>0 then
        print("Continuing Tunnel")
        check()
        if turtle.detect() then
            turtle.dig()
            turtle.forward()
            MoveCount = MoveCount+1
        else
            repeat
                turtle.forward()
                MoveCount = MoveCount+1
            until
                (turtle.detect() or turtle.getFuelLevel()==0)

            mine()
        end
    else
        print("Out of fuel")
    end
    print(MoveCount)
end
for i = 1,100 do
    mine()
end
SetDirection("backwards")
for i = 1,MoveCount do
    repeat if turtle.detect() then turtle.dig() end until not turtle.detect()
    turtle.forward()
end
print("Offset")
table.foreach(PosOffset,print)
print("Forward")
table.foreach(Forward,print)
print("Movements:"..MoveCount)