defmodule ToweropsWeb.WeathermapLive do
  @moduledoc """
  Live view for real-time network utilization weathermap.
  Displays network topology with color-coded edges based on bandwidth utilization.
  """
  use ToweropsWeb, :live_view

  alias Towerops.Topology

  @impl true
  def mount(_params, _session, socket) do
    organization = socket.assigns.current_scope.organization

    # Subscribe to topology changes and capacity updates if connected
    _ =
      if connected?(socket) do
        Phoenix.PubSub.subscribe(Towerops.PubSub, "topology:#{organization.id}")
        Phoenix.PubSub.subscribe(Towerops.PubSub, "capacity:#{organization.id}")
      end

    # Default empty topology
    default_topology = %{
      nodes: [],
      edges: [],
      stats: %{
        total_devices: 0,
        added_devices: 0,
        discovered_devices: 0,
        total_links: 0,
        high_utilization_links: 0,
        overutilized_links: 0
      },
      last_updated: DateTime.utc_now()
    }

    # Schedule auto-refresh every 60 seconds
    if connected?(socket) do
      Process.send_after(self(), :refresh_data, 60_000)
    end

    {:ok,
     socket
     |> assign(:page_title, t("Network Weathermap"))
     |> assign(:timezone, socket.assigns.current_scope.timezone)
     |> assign(:loading, true)
     |> assign(:topology, default_topology)
     |> assign(:active_tab, "added")
     |> assign(:selected_node_detail, nil)
     |> assign(:filter, "all")
     |> assign(:search_query, "")
     |> assign(:layout_mode, "force")
     |> assign(:fullscreen, false)}
  end

  @impl true
  def handle_params(params, _url, socket) do
    tab = Map.get(params, "tab", "added")
    fullscreen = Map.get(params, "fullscreen") == "true"
    organization = socket.assigns.current_scope.organization

    socket =
      socket
      |> assign(:active_tab, tab)
      |> assign(:fullscreen, fullscreen)
      |> load_weathermap_data(organization.id, tab)

    # Handle ?node= param for deep-linking to a selected node
    socket =
      case Map.get(params, "node") do
        nil ->
          socket

        node_id ->
          load_node_detail(socket, node_id, organization.id)
      end

    {:noreply, socket}
  end

  @impl true
  def handle_event("node_clicked", %{"node_id" => node_id} = params, socket) do
    organization = socket.assigns.current_scope.organization
    node_type = Map.get(params, "node_type", "managed")

    socket =
      socket
      |> load_node_detail(node_id, organization.id)
      |> then(fn s ->
        if s.assigns.selected_node_detail do
          push_event(s, "highlight_node", %{node_id: node_id, node_type: node_type})
        else
          s
        end
      end)

    {:noreply, socket}
  end

  @impl true
  def handle_event("close_detail_panel", _params, socket) do
    {:noreply,
     socket
     |> assign(:selected_node_detail, nil)
     |> push_event("clear_highlight", %{})}
  end

  @impl true
  def handle_event("set_filter", %{"filter" => filter}, socket) do
    {:noreply,
     socket
     |> assign(:filter, filter)
     |> push_event("apply_filter", %{filter: filter})}
  end

  @impl true
  def handle_event("search", %{"query" => query}, socket) do
    {:noreply,
     socket
     |> assign(:search_query, query)
     |> push_event("search_nodes", %{query: query})}
  end

  @impl true
  def handle_event("toggle_layout", %{"mode" => mode}, socket) do
    {:noreply,
     socket
     |> assign(:layout_mode, mode)
     |> push_event("change_layout", %{mode: mode})}
  end

  @impl true
  def handle_event("toggle_fullscreen", _params, socket) do
    new_fullscreen = not socket.assigns.fullscreen

    path_with_params =
      if new_fullscreen do
        ~p"/weathermap?#{%{tab: socket.assigns.active_tab, fullscreen: true}}"
      else
        ~p"/weathermap?#{%{tab: socket.assigns.active_tab}}"
      end

    {:noreply, push_navigate(socket, to: path_with_params)}
  end

  @impl true
  def handle_info(:refresh_data, socket) do
    organization = socket.assigns.current_scope.organization

    socket =
      load_weathermap_data(socket, organization.id, socket.assigns.active_tab)

    # Schedule next refresh
    Process.send_after(self(), :refresh_data, 60_000)

    {:noreply, socket}
  end

  @impl true
  def handle_info({:topology_updated, _organization_id}, socket) do
    # Real-time topology update
    {:noreply,
     load_weathermap_data(
       socket,
       socket.assigns.current_scope.organization.id,
       socket.assigns.active_tab
     )}
  end

  @impl true
  def handle_info({:capacity_updated, _organization_id}, socket) do
    # Real-time capacity/utilization update
    {:noreply,
     load_weathermap_data(
       socket,
       socket.assigns.current_scope.organization.id,
       socket.assigns.active_tab
     )}
  end

  defp load_weathermap_data(socket, organization_id, tab) do
    topology = Topology.get_topology_for_weathermap(organization_id, tab)

    socket
    |> assign(:topology, topology)
    |> assign(:loading, false)
    |> push_event("update_weathermap", %{topology: topology})
  end

  defp load_node_detail(socket, node_id, organization_id) do
    case Topology.get_node_detail(node_id, organization_id) do
      nil -> assign(socket, :selected_node_detail, nil)
      detail -> assign(socket, :selected_node_detail, detail)
    end
  end
end