startup

--[[

    This program will tell a turtle to cut down a 1x1 spruce tree.
    This should be passive and shouldn't have to be activated by the user
    There will probably be a helper computer to sort the logs and saplings from eachother.
    The turtle should only move in a line up and down.
    It will dump everything into the inventory below it.
    Assume that there are hoppers to collect all of the dropped saplings.
    The inventory below it should contain any saplings that are dropped. (Supposedly in the first slot)
]]

--[[ Constants ]]

MAX_HEIGHT = 12 -- Maximum height of a 1x1 spruce tree

--[[ Functions ]]

local function up() -- Moves turtle up one block, breaking any block in the way
    while not turtle.up() do
        turtle.digUp()
    end
end

local function reset() -- Resets turtle to starting position
    while turtle.down() do end
end

local function fell() -- Turtle chops a tree down and resets to starting position
    repeat
        turtle.dig()
        up()
    until not turtle.detect()
    reset()
end

local function deposit()
    turtle.select(1)
    turtle.refuel(2)
    for i = 1, 16 do
        turtle.select(i)
        turtle.dropDown()
    end
end

local function plant() -- Turtle retrieves a sapling and plants it in front of it
    turtle.select(1)
    turtle.suckDown(1)
    turtle.place()
end

local function isAirborne() -- Returns true if the turtle is in the air (might not be necessary)
    return not turtle.detectDown()
end


--[[ Main ]]

if isAirborne then
    fell()
    deposit()
    plant()
end

if not turtle.detect() then
    deposit()
    plant()
end

while true do
    local has_block, data = turtle.inspect()
    if has_block and data.name == "minecraft:spruce_log" then
        fell()
        deposit()
        plant()
    end
end