treefarm

local function left()
    turtle.turnLeft()
    if turtle.detect() then
        --turtle.dig()
    end
    turtle.suck()
    turtle.forward()
    turtle.turnRight()
end

local function right()
    turtle.turnRight()
    if turtle.detect() then
        --turtle.dig()
    end
    turtle.suck()
    turtle.forward()
    turtle.turnLeft()
end

local function forward()
    if turtle.detect() then
        --turtle.dig()
    end
    turtle.suck()
    turtle.forward()
end

local function back()
    turtle.suck()
    turtle.back()
end

local function up()
    if turtle.detectUp() then
        turtle.digUp()
    end
    turtle.up()
end

local function down()
    turtle.down()
end

local function empty()
    turtle.turnLeft()
    turtle.turnLeft()

    for i=1, 16 do
        local item= turtle.getItemDetail(i)
        if item and item.name == "minecraft:spruce_log" then
            turtle.select(i)
            turtle.drop(item.amount)
        end
    end

    turtle.turnRight()
    turtle.turnRight()
end

local function clear()
    turtle.turnRight()
    for i=1, 16 do
        local item= turtle.getItemDetail(i)
        if i > 1 and item and (item.name == "minecraft:spruce_sapling" or item.name == "twigs:twig") then
            turtle.select(i)
            turtle.drop(item.amount)
        end
    end
    turtle.turnLeft()
end

local function goRefuel()
    left()
    forward()
    up()
    left()
    turtle.suckDown(10)
    right()
    down()
    back()
    right()
end

local function breakTree()
    local count = -1
    turtle.down()
    while ( turtle.detect() ) do
        turtle.dig()
        if (turtle.detectUp()) then
            turtle.digUp()
        end
        turtle.up()
        count = count + 1
    end

    for i=count, 0, -1 do
        turtle.down()
    end
end

local function plantTree()
    if not turtle.detect() and turtle.getItemDetail(1) and turtle.getItemDetail(1).name == "minecraft:spruce_sapling" then
        turtle.select(1)
        turtle.place(1)
    end
end

local function collectItems()
    for i=1, 3 do
        turtle.forward()
        turtle.suck()
        turtle.turnLeft()
        turtle.forward()
        turtle.suck()
        turtle.turnRight()
        turtle.turnRight()
        turtle.forward()
        turtle.forward()
        turtle.suck()
        turtle.turnLeft()
        turtle.turnLeft()
        turtle.forward()
        turtle.turnRight()
    end

    for i=1, 3 do
        turtle.back()
    end
end

local function refuel()
    for i=1, 16 do
        local item = turtle.getItemDetail(i)
        if item and item.name == "minecraft:charcoal" then
            turtle.select(i)
            turtle.refuel()
        end
    end
end

local x = 1
local y = 1

while true do
    term.clear()
    term.setCursorPos(1,1)
    term.write(x .. " , " .. y)
    term.setCursorPos(1,2)
    term.write(turtle.getFuelLevel())

    turtle.select(1)

    if x == 6 and y == 6 then
        left()
        for i=1 , 10 do
            back()
        end
        right()
        empty()
        clear()
        goRefuel()
        refuel()

        sleep(300)

        x = 1
        y = 1
    elseif y == 2 or y == 4 or y == 6 then
        if x ~= 6 then
            left()
            left()
            x = x + 1
        else
            left()
            forward()
            forward()
            right()
            x = 1
            y = y + 1
        end
    else
        if x ~= 6 then
            right()
            right()
            x = x + 1
        else
            right()
            forward()
            forward()
            left()
            x = 1
            y = y + 1
        end
    end

    plantTree()
    up()


    if turtle.detect() then
        down()
        if x == 1 and y == 1 then
        else
            breakTree()
        end

        plantTree()
    else
        down()
    end

end