defmodule WorkloadService.Release do
  @moduledoc """
  Used for executing DB release tasks when run in production without Mix
  installed.
  """
  @app :workload_service

  def migrate do
    :ok = load_app()
    :ok = init_event_store()

    for repo <- repos() do
      {:ok, _, _} = Ecto.Migrator.with_repo(repo, &Ecto.Migrator.run(&1, :up, all: true))
    end

    :ok
  end

  def rollback(repo, version) do
    load_app()
    {:ok, _, _} = Ecto.Migrator.with_repo(repo, &Ecto.Migrator.run(&1, :down, to: version))
  end

  defp repos do
    Application.fetch_env!(@app, :ecto_repos)
  end

  defp load_app do
    {:ok, _} = Application.ensure_all_started(:ssl)
    {:ok, _} = Application.ensure_all_started(:postgrex)
    :ok = Application.ensure_loaded(@app)
    :ok
  end

  def init_event_store do
    config = WorkloadService.EventStore.config()

    :ok = EventStore.Tasks.Init.exec(config, [])
  end
end