block = turtle.inspect()
item = turtle.getItemDetail()
tunnelLength = 0
branchLength = 0
facing = 1
interval = 0
select = 1
endLoop = 0

function right()
    turtle.turnRight()
    facing = facing + 1
    if facing == 5 then
        facing = 1
    else
        facing = facing
    end
end

function left()
    turtle.turnLeft()
    facing = facing - 1
    if facing == 0 then
        facing = 4
    else
        facing = facing
    end
end

function turnAround()
    left()
    left()
    sleep(2)
end

function Tforward()
    turtle.dig()
    turtle.digUp()
    if turtle.detectDown() == false then
        select = 1
        while turtle.getItemDetail("minecraft:cobblestone") == false do
            turtle.select(select)
            select = select + 1
            if select == 17 then
                select = 1
            end
        turtle.placeDown()
        end
    end
    turtle.forward()
    tunnelLength = tunnelLength + 1
end

function Bforward()
    turtle.dig()
    turtle.digUp()
    if turtle.detectDown() == false then
        select = 1
        while turtle.getItemDetail("minecraft:cobblestone") == false do
            turtle.select(select)
            select = select + 1
            if select == 17 then
                select = 1
            end
        end
        turtle.placeDown()
    end
    turtle.forward()
    branchLength = branchLength + 1
end

function Treturn()
    while facing ~= 3 do
        right()
    end
    while tunnelLength > 0 do
        tunnelLength = tunnelLength - 1
        turtle.forward()
    end
end

function Breturn()
    turnAround()
    while branchLength > 0 do
        branchLength = branchLength - 1
        turtle.forward()
    end
end

function comeBack()
    turnAround()
    while branchLength > 0 do
        Breturn()
    end
    while tunnelLength > 0 do
        Treturn()
    end
end

function dump()
    for i = 1,16 do
        turtle.select(i)
        turtle.drop()
    end
end

while true do
    select = 1
    while turtle.getFuelLevel() < 1024 do
        turtle.refuel(1)
        turtle.select(select)
        select = select + 1
    end
    turnAround()
    turtle.inspect()
    if turtle.inspect("minecraft:chest") then
        print("Found chest")
    else
        print("I will dump here")
    end
    turnAround()
    Tforward(interval)
    right()
    Bforward(30)
    comeBack()
    dump()
    interval = interval + 3
    turnAround()
end