lib/history/trade_history_jobs.ex

defmodule History.TradeHistoryJobs do
  require Ecto.Query
  import Ecto.Query
  alias History.Repo
  alias History.Trades.TradeHistoryJob, as: Job

  @seconds_in_1_hour 60 * 60
  def job_changeset_today(params) do
    now = DateTime.utc_now()
    today = now |> DateTime.to_date()
    yesterday = today |> Timex.shift(days: -1)
    current_hour = Time.new!(now.hour, 0, 0)
    next_hour = current_hour |> Time.add(@seconds_in_1_hour, :second)

    merged_params =
      Map.merge(
        params,
        %{
          from_date: yesterday,
          from_time: current_hour,
          to_date: today,
          to_time: next_hour
        }
      )

    Job.changeset(%Job{}, merged_params)
  end

  @spec get!(Job.id()) :: Job.t()
  def get!(id) do
    Repo.get!(Job, id)
  end

  @default_latest_page 1
  @default_latest_page_size 25
  @max_page_size 100

  def latest(opts) do
    page = max((opts[:page] || @default_latest_page) - 1, 0)
    page_size = min(opts[:page_size] || @default_latest_page_size, @max_page_size)
    offset = page * page_size

    from(
      t in Job,
      order_by: [desc: :inserted_at],
      offset: ^offset,
      limit: ^page_size
    )
    |> Repo.all()
  end

  @spec count :: non_neg_integer
  def count do
    Repo.aggregate(Job, :count)
  end

  def insert(params) do
    changeset = Job.changeset(%Job{}, params)
    Repo.insert(changeset)
  end

  def update(job, params) do
    changeset = Job.changeset(job, params)
    Repo.update(changeset)
  end

  def enqueued_after(id, count) do
    from(
      t in Job,
      where: t.id > ^id and t.status == "enqueued",
      order_by: [asc: :id],
      limit: ^count
    )
    |> Repo.all()
  end
end