Turtle Refill

local chestOrder = 1
local enderchest1 = 15
local enderchest2 = 16


function scanInv()
    local invList = {}
    for i = 1,16 do
        turtle.select(i)
        local item = turtle.getItemDetail()
        if item then
            invList[i] = item.name
        end
    end
    return invList
end


function ParseInv(invList)
    turtle.select(16)
    turtle.dropUp()
    while turtle.suck() do
        local item = turtle.getItemDetail()
        for i =1,16 do
            if item.name == invList[i] then
                turtle.transferTo(i)
                break
            end
            if item.name == "minecraft:lava_bucket" or item.name == "minecraft:coal" then
                turtle.refuel(64)
            end
        end
        turtle.dropUp()
    end
end

function EnderChests(action)
    --action = 'set' or 'gather'
    if action == "set" then
        turtle.select(enderchest1)
        turtle.place()
        turtle.select(enderchest2)
        turtle.placeUp()
    elseif action == "gather" then
        if chestOrder == 1 then
            turtle.select(enderchest1)
            turtle.digUp()
            turtle.select(enderchest2)
            turtle.dig()
            chestOrder = 2
        elseif chestOrder == 2 then
            turtle.select(enderchest1)
            turtle.dig()
            turtle.select(enderchest2)
            turtle.digUp()
            chestOrder = 1
        end
    end
end


local inventory = scanInv()
for i = 1,4 do
    EnderChests("set")
    ParseInv(inventory)
    EnderChests("gather")
end