Minecraft Turtle Terraform

-- Desc: Attempts to flatten a square area defined by the user
-- By: hornedcommando

print("y set to 0")
y = 0

local function input()
    while true do
        write("How big me dig?\n")
        size = tonumber(read())
            break
        end
    end


--TODO: it's hard coded to use dirt, should update to use a table of blocks
local blocks = {
    {name = "minecraft:dirt"},
    {name = "minecraft:cobblestone"}
}

-- Function to smartly refuel the turtle
local function smartRefuel()
    -- Check if fuel level is below 200
    while turtle.getFuelLevel() < 200 do
        for slot = 1, 16 do
            turtle.select(slot) -- Select the slot
            if turtle.refuel(0) then -- Check if the selected item is a fuel
                turtle.refuel(1) -- Refuel with the selected item
                break -- Stop searching for fuel after refueling
            end
        end
    end
end

local function searchInventory(name)
    for slot = 1, 16 do
        turtle.select(slot)
        local slotDetail = turtle.getItemDetail()
        if slotDetail and slotDetail.name:find(name) then
            return slot -- Return the slot number if item found
        end
    end
    return nil -- Return nil if item not found
end

-- Function to make the turtle go up
function gu()
    print("Going up")
    while not turtle.up() do
        print("Digging up")
        turtle.digUp()
    end
    y = y + 1
    print("y is now " .. y)
end

local function fill(name)
    local found, slot = searchInventory(name)
    if found then
        turtle.placeDown()  -- Place the block
        print("Placed block:", name)
    else
        print("Block not found:", name)
    end
end

-- Function to make the turtle go down
function gd()
    print("Going down")
    while not turtle.down() do
        print("Digging down")
        turtle.digDown()
        if not turtle.inspectDown() and y == 0 then
            fill("minecraft:dirt")
        end
    end
    y = y - 1
    print("y is now " .. y)
end

-- Function to make the turtle go forward
function gf()
    print("Checking if a block is in front of me")
    if not turtle.inspectDown() then
        fill("minecraft:dirt")
    end
    while turtle.inspect() or turtle.inspectUp() do
        gu()
        end
    print("Moving forward")
    turtle.forward()
    while y > 0 do
        gd()
    end
    if not turtle.inspect() then
        fill("minecraft:dirt")
    end
    smartRefuel()
end

-- Function to make the turtle go back along the defined area
function lTurn()
    turtle.turnLeft()    -- Turn left
    gf()     -- Move forward
    turtle.turnLeft()    -- Turn left
end

-- Function to make the turtle go back along the defined area (but to the right)
function rTurn()
    turtle.turnRight()   -- Turn right
    gf()     -- Move forward
    turtle.turnRight()   -- Turn right
end

-- Function to make the turtle travel the length of the defined area
function fEnd(size)
    for i = 1, size do
        gf()  -- Move forward
    end
end

-- Combines movement functions to form a sweeping square pattern
local function sweep(size)
    for i = 1, size do
        fEnd(size - 1)  -- Move to the end of the row
        if i < size then
            if i % 2 == 1 then
                rTurn()  -- Turn right at the end of the row
            else
                lTurn()  -- Turn left at the end of the row
            end
        end
    end
end


smartRefuel()
input()
sweep(size)