sugarcane.lua

local function fastFail(success)
    if not success then
        print("An unexpected error has occured! Aborting.")
        exit()
    end
end

local function refuel(amount)
    local fuelLevel = turtle.getFuelLevel()
    if fuelLevel == "unlimited" then
        return true
    end

    turtle.select(16)
    while turtle.getItemCount(16) > 0 and turtle.getFuelLevel() < amount do
        if not turtle.refuel(1) then
            return false
        end
    end

    if turtle.getFuelLevel() < amount then
        return false
    else
        return true
    end
end

local function waitForFuel(amount)
    if not refuel(amount) then
        print("Please put fuel in slot 16")
        while not refuel(amount) do
            sleep(0.5)
        end
        print("Received sufficient fuel. Continuing...")
    end
end

local function selectItem(name)
    for i=15, 1, -1 do
        itemDetail = turtle.getItemDetail(i)
        if itemDetail and itemDetail.name == name then
            turtle.select(i)
            return true
        end
    end
    return false
end

local function countItem(name)
    num = 0
    for i=1, 15 do
        itemDetail = turtle.getItemDetail(i)
        if itemDetail and itemDetail.name == name then
            num = num + itemDetail.count
        end
    end
    return num
end

local function waitForItem(name, amount)
    if countItem(name) < amount then
        print("Please provide more " .. name)
        while countItem(name) < amount do
            sleep(0.5)
        end
        print("Received sufficient " .. name .. ". Continuing...")
    end
    selectItem(name)
end

local function waitForDrop()
    if turtle.getItemCount() > 0 and not turtle.drop() then
        print("Please make room for turtle to drop")
        while turtle.getItemCount() > 0 and not turtle.drop() do
            sleep(0.5)
        end
        print("Turtle successfully dropped. Continuing...")
    end
end

local function waitForDropDown()
    if turtle.getItemCount() > 0 and not turtle.dropDown() then
        print("Please make room for turtle to drop")
        while turtle.getItemCount() > 0 and not turtle.dropDown() do
            sleep(0.5)
        end
        print("Turtle successfully dropped. Continuing...")
    end
end

local function waitForDropUp()
    if turtle.getItemCount() > 0 and not turtle.dropUp() then
        print("Please make room for turtle to drop")
        while turtle.getItemCount() > 0 and not turtle.dropUp() do
            sleep(0.5)
        end
        print("Turtle successfully dropped. Continuing...")
    end
end

local function containerRefuel(amount)
    turtle.select(16)
    waitForDropUp() -- Edit this line to when changing refuel direction
    turtle.suckUp() -- Edit this line to when changing refuel direction
    if not refuel(amount) then
        print("Waiting for fuel...")
        sleep(0.5)
        while not refuel(amount) do
            sleep(0.5)
            waitForDropUp() -- Edit this line to when changing refuel direction
            turtle.suckUp() -- Edit this line to when changing refuel direction
        end
    end
end

local function getBlock()
    local hasBlock, data = turtle.inspect()
    if hasBlock then
        return data.name
    else
        return "minecraft:air"
    end
end

local function getBlockDown()
    local hasBlock, data = turtle.inspectDown()
    if hasBlock then
        return data.name
    else
        return "minecraft:air"
    end
end

local function getBlockUp()
    local hasBlock, data = turtle.inspectUp()
    if hasBlock then
        return data.name
    else
        return "minecraft:air"
    end
end

local function tryForward()
    waitForFuel(1)
    while not turtle.forward() do
        if getBlock() == "minecraft:glass_pane" then
            return false
        end
        if turtle.detect() then
            if not turtle.dig() then
                return false
            end
        elseif not turtle.attack() then
            sleep(0.5)
        end
    end

    if getBlockDown() == "minecraft:sugar_cane" then
        turtle.digDown()
    end

    return true
end

local function repeatForward(amount)
    for i=1, amount do
        fastFail(tryForward())
    end
end

local function recenter()
    while getBlockUp() ~= "minecraft:barrel" do
        if not tryForward() then
            turtle.turnLeft()
        end
    end
    while turtle.detect() and getBlock() ~= "minecraft:sugar_cane" do
        turtle.turnLeft()
    end
end

local function deposit()
    for i=1, 15 do
        if turtle.getItemCount(i) > 0 then
            turtle.select(i)
            waitForDropDown() -- Edit this line to when changing deposit direction
        end
    end
    turtle.select(16)
    if not turtle.refuel(0) then
        waitForDropDown() -- Edit this line to when changing deposit direction
    end
end

while true do
    recenter()
    deposit()

    for i=1, 20*60 do
        if getBlock() ~= "minecraft:sugar_cane" then
            sleep(1)
        else
            break
        end
    end

    containerRefuel(1024)

    for i=0, 14 do
        if i%3 == 0 then
            fastFail(tryForward())
            turtle.turnRight()
            repeatForward(15)
            turtle.turnLeft()
        elseif i % 3 == 1 then
            fastFail(tryForward())
        else
            fastFail(tryForward())
            turtle.turnLeft()
            repeatForward(15)
            turtle.turnRight()
        end
    end
end