defmodule MicrowavepropWeb.RoverPlanningLive.Show do
  @moduledoc """
  `/rover-planning/:id` mission detail. Renders the planned stations
  and the matrix of computed (or pending) terrain path profiles from
  every candidate rover-location.
  """
  use MicrowavepropWeb, :live_view

  alias Microwaveprop.Accounts.User
  alias Microwaveprop.Radio.Maidenhead
  alias Microwaveprop.RoverPlanning
  alias Microwaveprop.RoverPlanning.Mission

  @impl true
  def mount(%{"id" => id}, _session, socket) do
    case RoverPlanning.get_mission_with_paths(id) do
      nil ->
        {:ok,
         socket
         |> put_flash(:error, "Mission not found.")
         |> push_navigate(to: ~p"/rover-planning")}

      %Mission{} = mission ->
        if connected?(socket) do
          Phoenix.PubSub.subscribe(Microwaveprop.PubSub, "rover_planning:#{mission.id}")
        end

        {:ok,
         assign(socket,
           page_title: "Mission · #{mission.name}",
           mission: mission,
           paths: RoverPlanning.list_paths(mission)
         )}
    end
  end

  @impl true
  def handle_info({:rover_path_updated, _path_id}, socket) do
    {:noreply, assign(socket, paths: RoverPlanning.list_paths(socket.assigns.mission))}
  end

  @impl true
  def handle_event("delete", _params, socket) do
    case current_user(socket) do
      %User{} = user ->
        case RoverPlanning.delete_mission(user, socket.assigns.mission.id) do
          {:ok, _} ->
            {:noreply,
             socket
             |> put_flash(:info, "Mission deleted.")
             |> push_navigate(to: ~p"/rover-planning")}

          {:error, :not_found} ->
            {:noreply, put_flash(socket, :error, "You can only delete your own missions.")}
        end

      _ ->
        {:noreply, put_flash(socket, :error, "Sign in required.")}
    end
  end

  defp current_user(%Phoenix.LiveView.Socket{assigns: assigns}) do
    case assigns[:current_scope] do
      %{user: %User{} = user} -> user
      _ -> nil
    end
  end

  defp can_modify?(%{current_scope: %{user: %User{is_admin: true}}}, _), do: true

  defp can_modify?(%{current_scope: %{user: %User{id: id}}}, %Mission{user_id: id}) when not is_nil(id), do: true

  defp can_modify?(_, _), do: false

  defp band_label(mhz) when is_integer(mhz) and mhz >= 1000 do
    ghz = mhz / 1000
    if ghz == trunc(ghz), do: "#{trunc(ghz)} GHz", else: "#{Float.round(ghz, 1)} GHz"
  end

  defp band_label(mhz), do: "#{mhz} MHz"

  defp status_badge(:complete) do
    assigns = %{}
    ~H|<span class="badge badge-success badge-sm">Complete</span>|
  end

  defp status_badge(:computing) do
    assigns = %{}
    ~H|<span class="badge badge-info badge-sm">Computing</span>|
  end

  defp status_badge(:failed) do
    assigns = %{}
    ~H|<span class="badge badge-error badge-sm">Failed</span>|
  end

  defp status_badge(_) do
    assigns = %{}
    ~H|<span class="badge badge-ghost badge-sm">Pending</span>|
  end

  defp verdict_badge("clear") do
    assigns = %{}
    ~H|<span class="badge badge-success badge-xs">Clear</span>|
  end

  defp verdict_badge("blocked") do
    assigns = %{}
    ~H|<span class="badge badge-error badge-xs">Blocked</span>|
  end

  defp verdict_badge("marginal") do
    assigns = %{}
    ~H|<span class="badge badge-warning badge-xs">Marginal</span>|
  end

  defp verdict_badge(_), do: ""

  defp progress_summary(paths) do
    total = length(paths)
    complete = Enum.count(paths, &(&1.status == :complete))
    pending = Enum.count(paths, &(&1.status in [:pending, :computing]))
    failed = Enum.count(paths, &(&1.status == :failed))
    %{total: total, complete: complete, pending: pending, failed: failed}
  end

  defp format_distance(km) when is_number(km), do: "#{Float.round(km, 1)} km / #{Float.round(km * 0.621371, 1)} mi"

  defp format_distance(_), do: "—"

  defp format_db(nil), do: "—"
  defp format_db(value) when is_number(value), do: "#{Float.round(value, 1)} dB"

  defp rover_label(%{rover_location: %{lat: lat, lon: lon}}) when is_number(lat) and is_number(lon) do
    grid = Maidenhead.from_latlon(lat, lon, 6)
    "#{grid} (#{Float.round(lat, 4)}, #{Float.round(lon, 4)})"
  end

  defp rover_label(_), do: "—"

  defp station_label(%{station: %{callsign: c}}) when is_binary(c) and c != "", do: c
  defp station_label(%{station: %{grid: g}}) when is_binary(g) and g != "", do: g

  defp station_label(%{station: %{lat: lat, lon: lon}}) when is_number(lat) and is_number(lon),
    do: "#{Float.round(lat, 3)}, #{Float.round(lon, 3)}"

  defp station_label(_), do: "—"

  @impl true
  def render(assigns) do
    summary = progress_summary(assigns.paths)
    assigns = assign(assigns, :summary, summary)

    ~H"""
    <Layouts.app flash={@flash} current_scope={@current_scope} max_width="max-w-6xl">
      <.header>
        {@mission.name}
        <:subtitle>
          {band_label(@mission.band_mhz)} · {length(@mission.stations)} station(s) ·
          rover {@mission.rover_height_ft}ft / station {@mission.station_height_ft}ft
        </:subtitle>
        <:actions>
          <.link navigate={~p"/rover-planning"} class="btn btn-ghost btn-sm">
            <.icon name="hero-arrow-left" class="w-4 h-4" /> All missions
          </.link>
          <.link
            :if={can_modify?(assigns, @mission)}
            navigate={~p"/rover-planning/#{@mission.id}/edit"}
            class="btn btn-ghost btn-sm"
          >
            <.icon name="hero-pencil-square" class="w-4 h-4" /> Edit
          </.link>
          <button
            :if={can_modify?(assigns, @mission)}
            type="button"
            phx-click="delete"
            data-confirm="Delete this mission?"
            class="btn btn-ghost btn-sm text-error"
          >
            <.icon name="hero-trash" class="w-4 h-4" /> Delete
          </button>
        </:actions>
      </.header>

      <div class="card bg-base-100 border border-base-300 p-4 mb-4">
        <h3 class="font-semibold mb-2">Stationary stations</h3>
        <ul class="text-sm space-y-1">
          <li :for={station <- @mission.stations} class="flex flex-wrap gap-2">
            <span class="font-mono">{station.callsign || station.grid || station.input}</span>
            <span :if={station.grid} class="text-base-content/60">grid {station.grid}</span>
            <span class="text-base-content/60 font-mono">
              {Float.round(station.lat, 4)}, {Float.round(station.lon, 4)}
            </span>
          </li>
        </ul>

        <p :if={@mission.notes && @mission.notes != ""} class="mt-3 text-sm whitespace-pre-line">
          {@mission.notes}
        </p>

        <p class="text-xs text-base-content/60 mt-3">
          Scope: {if @mission.only_known_good,
            do: "Known good locations only (status = good)",
            else: "All rover locations"} · Owner: {(@mission.user && @mission.user.callsign) || "—"}
        </p>
      </div>

      <div class="card bg-base-100 border border-base-300 p-4">
        <div class="flex items-center justify-between mb-3 gap-2 flex-wrap">
          <h3 class="font-semibold">Path profiles</h3>
          <div class="text-xs text-base-content/70">
            {@summary.complete}/{@summary.total} complete
            <span :if={@summary.pending > 0}>· {@summary.pending} pending</span>
            <span :if={@summary.failed > 0} class="text-error">
              · {@summary.failed} failed
            </span>
          </div>
        </div>

        <div :if={@paths == []} class="text-sm text-base-content/60 py-4 text-center">
          No paths yet — they'll appear here as the workers run.
        </div>

        <div :if={@paths != []} class="overflow-x-auto">
          <table class="table table-sm">
            <thead>
              <tr>
                <th>Rover location</th>
                <th>Station</th>
                <th>Status</th>
                <th>Distance</th>
                <th>Min clearance</th>
                <th>Diffraction</th>
                <th>Verdict</th>
              </tr>
            </thead>
            <tbody>
              <tr :for={path <- @paths}>
                <td class="font-mono text-xs">{rover_label(path)}</td>
                <td class="font-mono text-xs">{station_label(path)}</td>
                <td>{status_badge(path.status)}</td>
                <td class="text-xs">
                  {if path.result, do: format_distance(path.result["distance_km"]), else: "—"}
                </td>
                <td class="text-xs">
                  {if path.result,
                    do: "#{Float.round(path.result["min_clearance_m"] || 0.0, 1)} m",
                    else: "—"}
                </td>
                <td class="text-xs">
                  {if path.result, do: format_db(path.result["diffraction_db"]), else: "—"}
                </td>
                <td>
                  {if path.result, do: verdict_badge(path.result["verdict"]), else: "—"}
                </td>
              </tr>
            </tbody>
          </table>
        </div>
      </div>
    </Layouts.app>
    """
  end
end