defmodule MicrowavepropWeb.PskrSpotsLive do
  @moduledoc "`/pskreporter` — recent PSK Reporter spot aggregates."
  use MicrowavepropWeb, :live_view

  import Ecto.Query

  alias Microwaveprop.Format
  alias Microwaveprop.Pskr.SpotHourly
  alias Microwaveprop.Repo

  @limit 100

  @impl true
  def mount(_params, _session, socket) do
    spots = fetch_recent_spots()

    {:ok,
     assign(socket,
       page_title: "PSK Reporter Spots",
       spots: spots
     )}
  end

  defp fetch_recent_spots do
    SpotHourly
    |> order_by(desc: :last_spot_at)
    |> limit(@limit)
    |> Repo.all()
  end

  defp fmt_dt(nil), do: "—"
  defp fmt_dt(dt), do: Calendar.strftime(dt, "%Y-%m-%d %H:%M UTC")

  defp fmt_snr(min, max) when min == max, do: "#{min} dB"
  defp fmt_snr(min, max), do: "#{min}–#{max} dB"

  @impl true
  def render(assigns) do
    ~H"""
    <Layouts.app flash={@flash} current_scope={@current_scope}>
      <.header>
        PSK Reporter Spots
        <:subtitle>Last {@limit} spot aggregates from the MQTT firehose</:subtitle>
      </.header>

      <div class="overflow-x-auto -mx-2 px-2">
        <table class="table table-sm table-zebra whitespace-nowrap">
          <thead>
            <tr>
              <th>Last Heard (UTC)</th>
              <th>Band</th>
              <th>From Grid</th>
              <th>To Grid</th>
              <th>Distance</th>
              <th class="text-right">Spots</th>
              <th>SNR</th>
              <th>Modes</th>
            </tr>
          </thead>
          <tbody>
            <%= for spot <- @spots do %>
              <tr>
                <td class="text-xs font-mono">{fmt_dt(spot.last_spot_at)}</td>
                <td class="text-xs"><span class="badge badge-sm">{spot.band}</span></td>
                <td class="text-xs font-mono">{spot.sender_grid}</td>
                <td class="text-xs font-mono">{spot.receiver_grid}</td>
                <td class="text-xs font-mono">{Format.distance_km(spot.distance_km)}</td>
                <td class="text-xs text-right font-mono">{Format.number(spot.spot_count)}</td>
                <td class="text-xs font-mono">{fmt_snr(spot.min_snr_db, spot.max_snr_db)}</td>
                <td class="text-xs">
                  <span :for={mode <- spot.modes} class="badge badge-xs mr-0.5">{mode}</span>
                </td>
              </tr>
            <% end %>
          </tbody>
        </table>
      </div>

      <p :if={@spots == []} class="text-sm text-base-content/50 italic mt-4">
        No PSK Reporter spots received yet. The MQTT listener is running — spots will appear here as they arrive.
      </p>
    </Layouts.app>
    """
  end
end