bump_server/lib/bump/messages.ex

defmodule Bump.Messages do
  alias Bump.Repo
  alias Bump.Messages.Message
  import Ecto.Query

  def pop(sender) do
    query = from m in "messages",
            where: m.sender == ^sender,
            order_by: [desc: m.timestamp],
            limit: 1,
            select: %{id: m.id, data: m.data, timestamp: m.timestamp}

    res = Repo.one(query)

    if not is_nil(res) do
      Repo.delete_all(from m in "messages", where: m.id == ^res.id)
    %{data: res.data, timestamp: res.timestamp}
    else
      nil
    end

  end

  def peak(sender) do
    query = from m in "messages",
            where: m.sender == ^sender,
            order_by: [desc: m.timestamp],
            limit: 1,
            select: %{data: m.data, timestamp: m.timestamp}
    Repo.one(query)
  end

  def list(sender, minutes) do

    ago = DateTime.utc_now 
          |> Timex.shift(minutes: -minutes) 
          |> DateTime.truncate(:second)

    query = from m in "messages",
            where: m.sender == ^sender and
            m.timestamp >= ^ago,
            select: %{data: m.data, timestamp: m.timestamp}

    Repo.all(query)
  end

  def clear(sender) do
    query = from m in "messages",
            where: m.sender == ^sender

    Repo.delete_all(query)
  end

  def push(sender, message) do
    time = DateTime.utc_now |> DateTime.truncate(:second)

    Repo.insert(%Message{sender: sender, data: message, timestamp: time})

  end


end