giantTreeFarm

term.clear()
term.setCursorPos(1, 1)

local fuel_requirement = 120
local current_direction = 0

local function checkFuel()
    if turtle.getItemCount(1) <= 1 then
        if turtle.getFuelLevel() < fuel_requirement then
            print("Fuel is urgently required in slot 1.")
        elseif turtle.getFuelLevel() < (fuel_requirement * 2) then
            print("Fuel is required soon in slot 1.")
        end
    end
    repeat
        if (turtle.getItemCount(1) > 1) then
            turtle.select(1)
            turtle.refuel(1)
        end
        sleep(0.5)
    until turtle.getFuelLevel() >= fuel_requirement
end

local function turnToFace(direction)
    if direction == 0 then
        if current_direction == 1 then
            turtle.turnLeft()
        elseif current_direction == 2 then
            turtle.turnLeft()
            turtle.turnLeft()
        elseif current_direction == 3 then
            turtle.turnRight()
        end
        current_direction = 0

    elseif direction == 1 then
        if current_direction == 2 then
            turtle.turnLeft()
        elseif current_direction == 3 then
            turtle.turnLeft()
            turtle.turnLeft()
        elseif current_direction == 0 then
            turtle.turnRight()
        end
        current_direction = 1

    elseif direction == 2 then
        if current_direction == 3 then
            turtle.turnLeft()
        elseif current_direction == 0 then
            turtle.turnLeft()
            turtle.turnLeft()
        elseif current_direction == 1 then
            turtle.turnRight()
        end
        current_direction = 2

    elseif direction == 3 then
        if current_direction == 0 then
            turtle.turnLeft()
        elseif current_direction == 1 then
            turtle.turnLeft()
            turtle.turnLeft()
        elseif current_direction == 2 then
            turtle.turnRight()
        end
        current_direction = 3

    end
end

local function waitForLog()
    success, data = turtle.inspect()
    print("Waiting for tree...")
    repeat
        sleep(1)
        success, data = turtle.inspect()
    until (data.name == "minecraft:spruce_log")
    print("Chopping tree...")
end

local function supplySaplings()
    -- get saplings from chest
    if turtle.getItemCount(2) < 4 then
        turnToFace(1)
        turtle.select(2)
        while turtle.getItemCount(2) < 4 do
            turtle.suck(1)
            sleep(1)
        end
        turtle.select(1)
        turnToFace(0)
    end
end



local function giantSpruce()
    turtle.select(1)
    checkFuel()
    supplySaplings()
    waitForLog()
    turtle.dig()
    turtle.forward()
    local success, data = turtle.inspectUp()
    while (success) do
        turtle.dig() -- dig in front
        turnToFace(1) -- turn right
        turtle.dig() -- dig in front (the right)
        turnToFace(0) -- turn left
        turtle.digUp()
        turtle.up()
        success, data = turtle.inspectUp()
    end
    turtle.dig()
    turtle.forward()
    turnToFace(1)
    success, data = turtle.inspectDown()
    while (not success) do
        turtle.dig()
        turtle.down()
        success, data = turtle.inspectDown()
    end
    turtle.dig()
    -- place down saplings
    turtle.select(2)
    turtle.up()
    turtle.placeDown()
    turtle.forward()
    turtle.placeDown()
    turnToFace(2)
    turtle.forward()
    turtle.placeDown()
    turnToFace(3)
    turtle.forward()
    turtle.placeDown()
    turnToFace(2)
    turtle.dig()
    turtle.forward()
    turtle.down()
    -- empty inventory
    for i = 3, 16, 1 do
        turtle.select(i)
        turtle.drop()
    end

    turnToFace(0)
end

local running = true
while running do
    giantSpruce()
end