prop/lib/microwaveprop_web/live/submit_live.ex

defmodule MicrowavepropWeb.SubmitLive do
  @moduledoc false
  use MicrowavepropWeb, :live_view

  alias Microwaveprop.Radio
  alias Microwaveprop.Radio.Qso
  alias Microwaveprop.Workers.QsoWeatherEnqueueWorker

  @band_options [
    {"1296 MHz", "1296"},
    {"2304 MHz", "2304"},
    {"3456 MHz", "3456"},
    {"5760 MHz", "5760"},
    {"10 GHz", "10000"},
    {"24 GHz", "24000"},
    {"47 GHz", "47000"},
    {"76 GHz", "75000"}
  ]

  @mode_options ~w(CW SSB FM FT8 FT4)

  @impl true
  def mount(_params, _session, socket) do
    changeset = Radio.change_qso(%Qso{})

    {:ok,
     assign(socket,
       page_title: "Submit QSO",
       form: to_form(changeset),
       band_options: @band_options,
       mode_options: @mode_options,
       submitted_at: nil
     )}
  end

  @impl true
  def handle_event("validate", %{"qso" => qso_params}, socket) do
    changeset =
      %Qso{}
      |> Radio.change_qso(qso_params)
      |> Map.put(:action, :validate)

    {:noreply, assign(socket, form: to_form(changeset))}
  end

  # Minimum milliseconds between submissions per LiveView session.
  # For broader IP-based rate limiting, use a reverse proxy (nginx limit_req, Cloudflare).
  @submission_cooldown_ms 30_000

  def handle_event("save", %{"qso" => qso_params}, socket) do
    if recently_submitted?(socket) do
      {:noreply, put_flash(socket, :error, "Please wait before submitting another QSO.")}
    else
      case Radio.create_qso(qso_params) do
        {:ok, qso} ->
          QsoWeatherEnqueueWorker.enqueue_for_qso(qso)

          {:noreply,
           socket
           |> assign(submitted_at: System.monotonic_time(:millisecond))
           |> put_flash(:info, "QSO submitted successfully!")
           |> push_navigate(to: ~p"/qsos/#{qso.id}")}

        {:error, changeset} ->
          {:noreply, assign(socket, form: to_form(changeset))}
      end
    end
  end

  defp recently_submitted?(socket) do
    case socket.assigns.submitted_at do
      nil -> false
      ts -> System.monotonic_time(:millisecond) - ts < @submission_cooldown_ms
    end
  end

  @impl true
  def render(assigns) do
    ~H"""
    <Layouts.app flash={@flash}>
      <.header>
        Submit QSO
        <:subtitle>Submit a microwave QSO for propagation analysis</:subtitle>
      </.header>

      <.form for={@form} id="qso-form" phx-change="validate" phx-submit="save" class="space-y-4">
        <div class="grid grid-cols-1 md:grid-cols-2 gap-4">
          <.input field={@form[:station1]} type="text" label="Station 1" placeholder="W5XD" />
          <.input
            field={@form[:grid1]}
            type="text"
            label="Grid 1"
            placeholder="EM12kp"
            phx-debounce="blur"
          />
          <.input field={@form[:station2]} type="text" label="Station 2" placeholder="K5TR" />
          <.input
            field={@form[:grid2]}
            type="text"
            label="Grid 2"
            placeholder="EM00cd"
            phx-debounce="blur"
          />
        </div>

        <p class="text-sm text-base-content/60 -mt-2">
          Be as specific as possible with grid squares (6 characters preferred, e.g. EM12kp).
        </p>

        <div class="grid grid-cols-1 md:grid-cols-3 gap-4">
          <.input
            field={@form[:band]}
            type="select"
            label="Band"
            prompt="Select band"
            options={@band_options}
          />
          <.input
            field={@form[:mode]}
            type="select"
            label="Mode"
            prompt="Select mode"
            options={@mode_options}
          />
          <.input field={@form[:qso_timestamp]} type="datetime-local" label="Timestamp (UTC)" />
        </div>

        <.input
          field={@form[:submitter_email]}
          type="email"
          label="Your Email"
          placeholder="you@example.com"
        />

        <div class="mt-6">
          <.button phx-disable-with="Submitting..." class="btn-primary">Submit QSO</.button>
        </div>
      </.form>
    </Layouts.app>
    """
  end
end