defmodule MicrowavepropWeb.BeaconLive.Index do
  @moduledoc false
  use MicrowavepropWeb, :live_view

  alias Microwaveprop.Beacons
  alias Microwaveprop.Beacons.Beacon

  @impl true
  def render(assigns) do
    ~H"""
    <Layouts.app flash={@flash} current_scope={@current_scope} max_width="max-w-6xl">
      <.header>
        Beacons
        <:subtitle>Microwave beacons tracked by NTMS.</:subtitle>
        <:actions>
          <.button variant="primary" navigate={~p"/beacons/new"}>
            <.icon name="hero-plus" /> Submit Beacon
          </.button>
        </:actions>
      </.header>

      <div
        id="beacons-map"
        phx-hook="BeaconsListMap"
        phx-update="ignore"
        data-beacons={@beacons_json}
        class="h-80 w-full rounded-lg border border-base-300 mb-6 z-0"
      >
      </div>

      <.table
        id="beacons"
        rows={@streams.beacons}
        row_click={fn {_id, beacon} -> JS.navigate(~p"/beacons/#{beacon}") end}
      >
        <:col :let={{_id, beacon}} label="Frequency (MHz)">
          {Beacon.format_freq(beacon.frequency_mhz)}
        </:col>
        <:col :let={{_id, beacon}} label="Call">{beacon.callsign}</:col>
        <:col :let={{_id, beacon}} label="Grid">{beacon.grid}</:col>
        <:col :let={{_id, beacon}} label="EIRP (mW)">{Beacon.format_mw(beacon.power_mw)}</:col>
        <:col :let={{_id, beacon}} label="Height AGL (ft)">{beacon.height_ft}</:col>
        <:col :let={{_id, beacon}} label="Keying">{Beacon.keying_label(beacon.keying)}</:col>
        <:col :let={{_id, beacon}} label="On air">
          <span class={["badge badge-sm", (beacon.on_the_air && "badge-success") || "badge-ghost"]}>
            {if beacon.on_the_air, do: "Yes", else: "No"}
          </span>
        </:col>
        <:action :let={{_id, beacon}}>
          <div class="sr-only">
            <.link navigate={~p"/beacons/#{beacon}"}>Show</.link>
          </div>
          <.link :if={admin?(@current_scope)} navigate={~p"/beacons/#{beacon}/edit"}>Edit</.link>
        </:action>
        <:action :let={{id, beacon}}>
          <.link
            :if={admin?(@current_scope)}
            phx-click={JS.push("delete", value: %{id: beacon.id}) |> hide("##{id}")}
            data-confirm="Delete this beacon?"
          >
            Delete
          </.link>
        </:action>
      </.table>

      <div :if={admin?(@current_scope) and @pending != []} class="mt-10">
        <.header>
          Pending approval
          <:subtitle>Submitted beacons waiting for admin review.</:subtitle>
        </.header>

        <.table
          id="pending-beacons"
          rows={@streams.pending}
          row_click={fn {_id, beacon} -> JS.navigate(~p"/beacons/#{beacon}") end}
        >
          <:col :let={{_id, beacon}} label="Frequency (MHz)">
            {Beacon.format_freq(beacon.frequency_mhz)}
          </:col>
          <:col :let={{_id, beacon}} label="Call">{beacon.callsign}</:col>
          <:col :let={{_id, beacon}} label="Grid">{beacon.grid}</:col>
          <:col :let={{_id, beacon}} label="EIRP (mW)">{Beacon.format_mw(beacon.power_mw)}</:col>
          <:col :let={{_id, beacon}} label="Height AGL (ft)">{beacon.height_ft}</:col>
          <:col :let={{_id, beacon}} label="Submitted">
            {Calendar.strftime(beacon.inserted_at, "%Y-%m-%d %H:%M UTC")}
          </:col>
          <:action :let={{_id, beacon}}>
            <.link
              phx-click={JS.push("approve", value: %{id: beacon.id})}
              data-confirm="Approve this beacon?"
            >
              Approve
            </.link>
          </:action>
          <:action :let={{id, beacon}}>
            <.link
              phx-click={JS.push("delete", value: %{id: beacon.id}) |> hide("##{id}")}
              data-confirm="Delete this beacon?"
            >
              Delete
            </.link>
          </:action>
        </.table>
      </div>
    </Layouts.app>
    """
  end

  @impl true
  def mount(_params, _session, socket) do
    if connected?(socket), do: Beacons.subscribe_beacons()

    beacons = Beacons.list_beacons()

    pending =
      if admin?(socket.assigns.current_scope) do
        Beacons.list_pending_beacons()
      else
        []
      end

    {:ok,
     socket
     |> assign(:page_title, "Beacons")
     |> assign(:pending, pending)
     |> assign(:beacons_json, encode_beacons(beacons))
     |> stream(:beacons, beacons)
     |> stream(:pending, pending)}
  end

  @impl true
  def handle_event("delete", %{"id" => id}, socket) do
    if admin?(socket.assigns.current_scope) do
      beacon = Beacons.get_beacon!(id)
      {:ok, _} = Beacons.delete_beacon(beacon)

      {:noreply,
       socket
       |> stream_delete(:beacons, beacon)
       |> stream_delete(:pending, beacon)}
    else
      {:noreply, put_flash(socket, :error, "Admins only.")}
    end
  end

  def handle_event("approve", %{"id" => id}, socket) do
    if admin?(socket.assigns.current_scope) do
      beacon = Beacons.get_beacon!(id)
      {:ok, approved} = Beacons.approve_beacon(beacon)

      {:noreply,
       socket
       |> put_flash(:info, "Approved #{approved.callsign}.")
       |> stream_delete(:pending, beacon)
       |> stream_insert(:beacons, approved)}
    else
      {:noreply, put_flash(socket, :error, "Admins only.")}
    end
  end

  @impl true
  def handle_info({type, %Beacon{}}, socket) when type in [:created, :updated, :deleted] do
    beacons = Beacons.list_beacons()

    pending =
      if admin?(socket.assigns.current_scope) do
        Beacons.list_pending_beacons()
      else
        []
      end

    {:noreply,
     socket
     |> assign(:pending, pending)
     |> assign(:beacons_json, encode_beacons(beacons))
     |> stream(:beacons, beacons, reset: true)
     |> stream(:pending, pending, reset: true)}
  end

  defp admin?(%{user: %{is_admin: true}}), do: true
  defp admin?(_), do: false

  # Serialize just the fields the map hook needs. `phx-update="ignore"`
  # means this data attribute is only read on initial hook mount — the
  # map won't re-render when beacons change without a full LV reload.
  # For now that's fine because list churn is rare; upgrade to
  # push_event("update_beacons", ...) if we start getting live PubSub
  # updates that need to reflect on the map without a refresh.
  defp encode_beacons(beacons) do
    beacons
    |> Enum.filter(&(is_number(&1.lat) and is_number(&1.lon)))
    |> Enum.map(fn b ->
      %{
        id: b.id,
        callsign: b.callsign,
        lat: b.lat,
        lon: b.lon,
        frequency_mhz: b.frequency_mhz,
        grid: b.grid,
        keying: Beacon.keying_label(b.keying),
        on_the_air: b.on_the_air
      }
    end)
    |> Jason.encode!()
  end
end