defmodule UpiStatic do
  @moduledoc """
  UpiStatic is the Static QR PSP Phoenix application.

  Handles all UPI flows where initiationMode = 02 or 15 (static QR).
  Uses orgId: MER102, netInstId: MER1020002.

  Implements NPCI UPI APIs:
  - ReqValQr  — QR validation (static QR lookup by tr/tn)
  - ReqPay    — payment processing (static QR transactions)
  - ReqChkTxn — transaction status check
  - ReqHbt    — heartbeat
  """

  def static_paths, do: ~w(assets fonts images favicon.ico robots.txt)

  def router do
    quote do
      use Phoenix.Router, helpers: false
      import Plug.Conn
      import Phoenix.Controller
    end
  end

  def channel do
    quote do
      use Phoenix.Channel
    end
  end

  def controller do
    quote do
      use Phoenix.Controller,
        formats: [:html, :json],
        layouts: [html: UpiStatic.Layouts]

      use Gettext, backend: UpiStatic.Gettext
      import Plug.Conn
      unquote(verified_routes())
    end
  end

  defp verified_routes do
    quote do
      use Phoenix.VerifiedRoutes,
        endpoint: UpiStatic.Endpoint,
        router: UpiStatic.Router,
        statics: UpiStatic.static_paths()
    end
  end

  defmacro __using__(which) when is_atom(which) do
    apply(__MODULE__, which, [])
  end
end