local sideTunnelDistance=2;
local sideTunnelLength=5;
local cobbleSlot = 1;

function digForward(number)
    for i = 0,number,1
    do
        turtle.dig();
        stepForward();
        placeBlocksLeftRight();
        turtle.digUp();
        turtle.up();
        placeBlocksLeftRight();
        placeBlockUp();
        turtle.down();
    end
end

function moveForward(stepNumber)
    if(stepNumber==nil)then
        stepForward();
    else
        for sn=0,stepNumber,1 do
            stepForward();
        end
    end
end

function stepForward()
    if(turtle.getFuelLevel()<50)then
        if(turtle.refuel())then
            print("Successfully refuelled");
        else
            print("Refuelling failed... shutting off!");
            error("Refuelling failed!");
        end
    end
    turtle.forward();
end

function stepUp()
    if(turtle.getFuelLevel()<50)then
        if(turtle.refuel())then
            print("Successfully refuelled");
        else
            print("Refuelling failed... shutting off!");
            error("Refuelling failed!");
        end
    end
    turtle.up();
end

function placeBlocksLeftRight()
    turtle.turnLeft();
    placeCobbleFront();
    turtle.turnLeft();
    turtle.turnLeft();
    placeCobbleFront();
    turtle.turnRight();
end

function placeCobbleFront()
    --TODO: Finish this method
    --check wether the old slot still contains cobblestone
    if((turtle.getItemDetail(cobbleSlot) ~= nil) and (turtle.getItemDetail(cobbleSlot).name=="minecraft:cobblestone"))then
        turtle.place(cobbleSlot);
    else
        if(getcobbleSlot() == false)then
        print("No Cobblestone left. this might become messy :("); --TODO: stop when there is no cobble left?
        else
            turtle.place(cobbleSlot);
        end
    end
end

function placeBlockUp()
    if(turtle.getItemDetail(cobbleSlot).name=="minecraft:cobblestone")then
    turtle.placeUp(cobbleSlot);
else
    if(getcobbleSlot() == false)then
    print("No Cobblestone left. this might become messy :("); --TODO: stop when there is no cobble left?
    else
        turtle.placeUp(cobbleSlot);
    end
end
end

function endTunnel()
    placeCobbleFront();
    turtle.up();
    placeCobbleFront();
    turtle.down();
end

function getcobbleSlot()
    for i=1,9,1  do
        if(turtle.getItemDetail(cobbleSlot).name=="minecraft:cobblestone")then
            cobbleSlot = i;
            return true;
        end
    end
    return false;
end


--Here begins the actual Script
for k=0,10,1
do
    digForward(sideTunnelDistance+1);
    endTunnel()
    turtle.turnLeft();
    digForward(sideTunnelLength);
    endTunnel()
    turtle.turnLeft();
    turtle.turnLeft();
    moveForward(sideTunnelLength);
    digForward(sideTunnelLength);
    endTunnel()
    turtle.turnLeft();
    turtle.turnLeft();
    moveForward(sideTunnelLength);
    turtle.turnRight();
end