charger = peripheral.wrap("front")

function retrieveQuartz()
    turtle.select(16)
    turtle.suck()
end

function pushQuartz()
    turtle.dropUp()
end

function placeQuartz()
    turtle.select(1)
    turtle.drop(1)
end

function isCharged()
    itemName = charger.getStackInSlot(1).raw_name
    if string.match(itemName, "charged") then
        return true
    else
        return false
    end
end

function isEmpty()
  if (charger.getStackInSlot(1) == null) then
    return true
  else
    return false
  end
end

function isFirstSlotEmpty()
    if (turtle.getItemCount(1) == 0) then
        return true
    else
        return false
    end
end

while true do
    if (isEmpty() and not isFirstSlotEmpty()) then
        placeQuartz()
    end

    if (not isEmpty() and isCharged()) then
        retrieveQuartz()
    end

    os.sleep(0.1)
end