defmodule ArcadiaCloudWeb.QuoteController do
  @moduledoc """
  Pricing quotes. A tenant hits this before provisioning to see what a
  plan + addons would cost, optionally with projected usage to preview
  likely overage.

  Body:
    plan_code        — required
    addons           — optional list of addon codes
    projected_usage  — optional map resource_kind => qty
    starts_on        — optional ISO date; if set, returns prorated
                       first-invoice figures
  """

  use ArcadiaCloudWeb, :controller

  alias ArcadiaCloud.{Catalog, Quoting}

  def create(conn, params) do
    plan = params["plan_code"] && Catalog.get_plan_by_code(params["plan_code"])
    version = plan && Catalog.active_version(plan)

    cond do
      is_nil(version) ->
        conn |> put_status(:not_found) |> json(%{error: "plan_or_version_not_found"})

      true ->
        addons = Catalog.get_addons(params["addons"] || [])

        opts =
          []
          |> put_opt(:usage, params["projected_usage"])
          |> put_opt(:starts_on, parse_date(params["starts_on"]))

        quote = Quoting.quote(version, addons, opts)
        json(conn, %{quote: quote, plan_code: plan.code})
    end
  end

  defp put_opt(opts, _key, nil), do: opts
  defp put_opt(opts, key, value), do: Keyword.put(opts, key, value)

  defp parse_date(nil), do: nil
  defp parse_date(""), do: nil

  defp parse_date(s) do
    case Date.from_iso8601(s) do
      {:ok, d} -> d
      _ -> nil
    end
  end
end