tfeller

local wood, sapling = 1, 2
local treeHeight = 0
local treeCount = 0
local plantCount = 6

function tRefuel()
    while turtle.getFuelLevel() < 200 do
        turtle.select(wood) --charcol in this slot
        turtle.refuel(1)
        print("Refueled")
    end
    print( "Fuel Level: ", turtle.getFuelLevel() )
end

function tF()
    while not turtle.forward() do
        -- turtle blocked from moving forward
        print( "Turtle blocked from moving forward" )
        sleep(3) -- wait 3 seconds to let mob move away
    end
end

function tVacume()
    for i = 1, 4 do
        turtle.turnLeft()
        turtle.suck()
    end
    turtle.suckUp() -- in case a sapling fell on turtle's head:D
end



while true do
    tRefuel()
    print( "Tree Count: ", treeCount )
    -- check all trees for any that have grown
    for i = 1, plantCount do
        turtle.turnRight()
        turtle.select(wood)
        -- if the tree has grown
        if turtle.compare() then
            -- harvest the tree
            treeCount = treeCount + 1
            while turtle.compare() do
                turtle.dig()
                if turtle.detectUp() then
                    turtle.digUp()
                end
                turtle.up()
                treeHeight = treeHeight + 1
            end
            -- return to the ground
            -- if blocked, dig
            while treeHeight > 0 do
                if turtle.down() then
                    treeHeight = treeHeight - 1
                else
                    turtle.digDown()
                end
            end
            -- plant a new sapling
            turtle.select(sapling)
            turtle.place()
        else
            turtle.select(sapling)
            if not turtle.compare() then
                turtle.place()
            end
        end
        -- move to next tree location
        turtle.turnLeft()
        tVacume()
        tF()
        tVacume()
        tF()
        tVacume()
        tF()
        tVacume()
        tF()
        tVacume()
    end
    -- round the corner
    tF()
    -- dump excess items into chest if a chest is present
    if turtle.detect() then
        for i = 3, 16 do
            turtle.select(i)
            turtle.drop()
        end
        print( "Dropped off Excess Items")
    end
    turtle.turnRight()
    tF()
    tF()
    turtle.turnRight()
    tF()
    sleep(60) -- wait for trees to grow and saplings to fall
end