CircleMakerV2[NoFuel]

x = nil

y = nil

z = 0

slot = 1

function selectSlot()
    if turtle.getItemCount(slot) == 0 and slot < 16 then
        slot = slot + 1
    elseif turtle.getItemCount(slot) == 0 and slot == 16 then
        slot = 1
    end
    turtle.select(slot)
end

function digHole()
    while z < h do
        turtle.digDown()
        turtle.down()
        z = z + 1
    end
    while z > 0 do
        turtle.digUp()
        turtle.up()
        z = z - 1
    end
end

function testRange()
    if math.sqrt(math.pow(x, 2) + math.pow(y, 2)) <= r then
        return true
    else
        return false
    end
end

function testRangeInverse()
    if math.sqrt(math.pow(x, 2) + math.pow(y, 2)) >= r-1 then
        return true
    else
        return false
    end
end

function subSearch()
    while y <= r do
        if testRange() then
            digHole()
        end
        while x < r do
            turtle.dig()
            turtle.forward()
            x = x + 1
            if testRange() then
                digHole()
            end
        end
        turtle.turnRight()
        turtle.dig()
        turtle.forward()
        y = y + 1
        if testRange() then
            digHole()
        end
        turtle.turnRight()
        while x > -r do
            turtle.dig()
            turtle.forward()
            x = x - 1
            if testRange() then
                digHole()
            end
        end
        turtle.turnLeft()
        turtle.dig()
        turtle.forward()
        y = y + 1
        if testRange() then
            digHole()
        end
        turtle.turnLeft()
    end
end

function addSearch()
    while y <= r do
        if testRange() and testRangeInverse() then
            turtle.digDown()
            selectSlot()
            turtle.placeDown()
        end
        while x < r do
            turtle.dig()
            turtle.forward()
            x = x + 1
            if testRange() then
                turtle.digDown()
                selectSlot()
                turtle.placeDown()
            end
        end
        turtle.turnRight()
        turtle.dig()
        turtle.forward()
        y = y + 1
        if testRange() then
            turtle.digDown()
            selectSlot()
            turtle.placeDown()
        end
        turtle.turnRight()
        while x > -r do
            turtle.dig()
            turtle.forward()
            x = x - 1
            if testRange() then
                turtle.digDown()
                selectSlot()
                turtle.placeDown()
            end
        end
        turtle.turnLeft()
        turtle.dig()
        turtle.forward()
        y = y + 1
        if testRange() then
            turtle.digDown()
            selectSlot()
            turtle.placeDown()
        end
        turtle.turnLeft()
    end
end



print("+-------------------------------------+")
print("| Circle Miner                        |")
print("+-------------------------------------+")

print("+-------------------------------------+")

print("+-------------------------------------+")
read()
print("+-------------------------------------+")
print("| Radius = ?                          |")
print("+-------------------------------------+")
r = tonumber(read())
print("+-------------------------------------+")
print("| Mode = ?                            |")
print("+-------------------------------------+")
mode = tostring(read())

x = -r

y = -r

if mode == "sub" then
    print("+-------------------------------------+")
    print("| Height = ?                          |")
    print("+-------------------------------------+")
    h = tonumber(read())
    subSearch()
end



if mode == "add" then
    addSearch()
end