Minecraft Turtle stairDown

--Desc: A turtle program which attempts to stair down through blocks, number of stairs defined by the user
-- Useful for making mineshafts or traversing the nether
--By: hornedcommando and BadPunBananas

--TODO: currently it is hardcoded to only place dirtblocks, should be updated to a dict with at least cobble and netherack


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

local function isForbiddenBlock(blockName)
    local forbiddenBlocks = {
        "forbidden_arcanus:stella_arcanum",
        "minecraft:bedrock"
    }
    for _, forbiddenBlock in ipairs(forbiddenBlocks) do
        if blockName == forbiddenBlock then
            return true
        end
    end
    return false
end

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 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 refuel the turtle, attempts to maintain a specified fuel level, this could be adjusted based on abundance of fuel or time between fuel calls
local function smartRefuel()
    print("Checking Fuel")
    -- Check if fuel level is below 1000
    while turtle.getFuelLevel() < 1000 do
        print("Refueling")
        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

function gd()
    print("Going down")
    local success, block = turtle.inspectDown()
    if isForbiddenBlock(block.name) then
        print("Detected block is forbidden")
        return false
    else
        local success, block = turtle.inspectUp()
        if isForbiddenBlock(block.name) then
            print("Detected block is forbidden")
            return false
        else
            turtle.digUp()
            while not turtle.down() do
                print("Digging down")
                turtle.digDown()
            end
            if not turtle.inspectDown() then
                fill("minecraft:dirt")
            end
            return true
        end
    end

end

function gf()
    print("Going forward")
    local success, block = turtle.inspect()
    if isForbiddenBlock(block.name) then
        print("Detected block is forbidden")
        return false
    else
        while not turtle.forward() do
            print("Digging forward")
            turtle.dig()
        end
    end
end

function stairDown()
    for i = 1, size do
        gd()
        gf()
    end
end

input()
smartRefuel()
stairDown()