-- Inventory = Array 1 - 16
-- Slot: 13 - What to axe
-- Slot: 14 - Fuel
-- Slot: 15 - Torch
-- Slot: 16 - Sappling

function moveForward()
    i = 1
    while i <= 5 do
        turtle.forward()
        i = i + 1
    end
end

function woodAbove()
    if turtle.compareTo(13) then
        turtle.dig()
        turtle.up()
        return true
    else
        return false
    end
end

function plantTree()
    turtle.turnLeft()
    turtle.forward()
    local height = 0
    if turtle.detect() then
        if turtle.compareTo(13) then
            turtle.dig()
            turtle.forward()
            while woodAbove() do
                height = height + 1
                woodAbove()
            end
            while height > 0 do
                turtle.down()
                height = height - 1
            end
            turtle.back()
            turtle.back()
        else
            turtle.back()
        end
    else
        turtle.select(16)
        turtle.place()
        turtle.back()
    end
end


local numberOfTrees = 2

while numberOfTrees > 0 do
    moveForward()
    plantTree()
    turtle.turnLeft()
    plantTree()
end