-- Dark Oak Turtle Farm: Centered Cube Chopper + 2x2 Planting

local saplingSlot = 1
local fuelSlot = 16
local cubeX, cubeY, cubeZ = 4, 10, 4    -- Make X and Z EVEN for perfect centering
local dumpToChest = false

posX, posY, posZ = 0, 0, 0
heading = 0 -- 0=fwd, 1=right, 2=back, 3=left

function turnRight() turtle.turnRight(); heading=(heading+1)%4 end
function turnLeft() turtle.turnLeft(); heading=(heading+3)%4 end
function face(dir)
    local turns = (dir-heading)%4
    if turns==1 then turnRight()
    elseif turns==2 then turnRight(); turnRight()
    elseif turns==3 then turnLeft() end
end
function forward()
    while true do
        if turtle.forward() then
            if heading==0 then posZ=posZ+1
            elseif heading==1 then posX=posX+1
            elseif heading==2 then posZ=posZ-1
            else posX=posX-1 end
            break
        else
            turtle.dig()
            sleep(0.1)
        end
    end
end
function moveUp() while true do if turtle.up() then posY=posY+1; break else turtle.digUp(); sleep(0.1) end end end
function moveDown() while true do if turtle.down() then posY=posY-1; break else turtle.digDown(); sleep(0.1) end end end

function goTo(tx,ty,tz,th)
    while posY<ty do moveUp() end
    while posY>ty do moveDown() end
    if posX<tx then face(1) while posX<tx do forward() end
    elseif posX>tx then face(3) while posX>tx do forward() end end
    if posZ<tz then face(0) while posZ<tz do forward() end
    elseif posZ>tz then face(2) while posZ>tz do forward() end end
    face(th)
end

function refuel()
    if not fuelSlot then return true end
    if turtle.getFuelLevel()=="unlimited" then return true end
    if turtle.getFuelLevel()<200 then
        turtle.select(fuelSlot)
        if not turtle.refuel(1) then print("⚠️ Out of fuel!"); return false end
    end
    return true
end

function dumpItems()
    if not dumpToChest then return end
    print("Dumping items...")
    turnLeft(); turnLeft()
    for i=2,16 do
        turtle.select(i)
        local itm=turtle.getItemDetail()
        if itm and not itm.name:find("sapling") then turtle.drop() end
    end
    turnLeft(); turnLeft()
end

-- Centered Cube: covers everything left/right/forward/back
function chopCube()
    local offX = math.floor(cubeX/2)
    local offZ = math.floor(cubeZ/2)
    for y=1,cubeY-1 do
        for x=-offX,offX+1 do
            for z=-offZ,offZ+1 do
                goTo(x, y, z, 0)
                turtle.dig()
                turtle.digUp()
                turtle.digDown()
            end
        end
    end
    goTo(0,0,0,0)
end

function plantSaplings()
    print("Planting dark oak saplings...")
    -- Move up to clear the 2x2 patch, so turtle isn't in the way
    goTo(0, 2, 0, 0) -- Go 2 blocks above home (for clearance)

    local spots = {
        {0,0},
        {1,0},
        {0,1},
        {1,1},
    }
    for i,spot in ipairs(spots) do
        goTo(spot[1], 2, spot[2], 0)  -- always 2 above the patch
        turtle.select(saplingSlot)
        -- Try to plant on the block below
        if not turtle.detectDown() then
            if turtle.placeDown() then print("Sapling planted at "..spot[1]..","..spot[2]) end
        end
    end
    goTo(0,0,0,0)
end

while true do
    print("Waiting for tree...")
    while true do
        local ok, data = turtle.inspect()
        if ok and (data.name:find("log") or data.name:find("leaves") or data.name:find("wood")) then break end
        sleep(5)
        refuel()
    end

    print("Tree detected! Chopping centered cube...")
    chopCube()
    goTo(0,0,0,0)
    dumpItems()
    print("Planting saplings...")
    plantSaplings()
    print("Cycle complete. Waiting for new tree...")
    sleep(10)
end