defmodule ToweropsWeb.Live.Components.GlobalSearchComponent do
  @moduledoc """
  Global search overlay (Cmd+K / Ctrl+K) that searches across
  devices, sites, accounts, and alerts.
  """
  use ToweropsWeb, :live_component

  alias Towerops.Search

  @impl true
  def mount(socket) do
    {:ok, assign(socket, query: "", results: %{}, selected_index: 0, open: false)}
  end

  @impl true
  def update(assigns, socket) do
    {:ok, assign(socket, assigns)}
  end

  @impl true
  def handle_event("open", _params, socket) do
    {:noreply, assign(socket, open: true, query: "", results: %{}, selected_index: 0)}
  end

  @impl true
  def handle_event("close", _params, socket) do
    {:noreply, assign(socket, open: false, query: "", results: %{}, selected_index: 0)}
  end

  @impl true
  def handle_event("search", %{"value" => query}, socket) do
    results =
      if String.length(String.trim(query)) >= 2 do
        Search.search(socket.assigns.organization_id, String.trim(query))
      else
        %{}
      end

    {:noreply, assign(socket, query: query, results: results, selected_index: 0)}
  end

  @impl true
  def handle_event("keydown", %{"key" => "ArrowDown"}, socket) do
    max = flat_results_count(socket.assigns.results) - 1
    idx = min(socket.assigns.selected_index + 1, max(max, 0))
    {:noreply, assign(socket, selected_index: idx)}
  end

  @impl true
  def handle_event("keydown", %{"key" => "ArrowUp"}, socket) do
    idx = max(socket.assigns.selected_index - 1, 0)
    {:noreply, assign(socket, selected_index: idx)}
  end

  @impl true
  def handle_event("keydown", %{"key" => "Enter"}, socket) do
    flat = flat_results(socket.assigns.results)

    case Enum.at(flat, socket.assigns.selected_index) do
      nil -> {:noreply, socket}
      result -> {:noreply, push_navigate(socket, to: result.url)}
    end
  end

  @impl true
  def handle_event("keydown", _params, socket) do
    {:noreply, socket}
  end

  @impl true
  def render(assigns) do
    flat = flat_results(assigns.results)
    assigns = assign(assigns, flat_results: flat)

    ~H"""
    <div id="global-search" phx-hook="GlobalSearch" phx-target={@myself}>
      <%= if @open do %>
        <div class="fixed inset-0 z-50 overflow-y-auto" role="dialog" aria-modal="true">
          <div
            class="fixed inset-0 bg-black/50 transition-opacity"
            phx-click="close"
            phx-target={@myself}
          >
          </div>
          <div class="flex min-h-full items-start justify-center p-4 pt-[15vh]">
            <div class="relative w-full max-w-lg transform rounded-xl bg-white shadow-2xl ring-1 ring-black/5 dark:bg-gray-800 dark:ring-white/10">
              <div class="flex items-center gap-3 border-b border-gray-200 px-4 dark:border-white/10">
                <.icon name="hero-magnifying-glass" class="h-5 w-5 text-gray-400 dark:text-gray-500" />
                <input
                  type="text"
                  id="global-search-input"
                  placeholder="Search devices, sites, accounts, alerts..."
                  value={@query}
                  phx-keydown="keydown"
                  phx-keyup="search"
                  phx-debounce="200"
                  phx-target={@myself}
                  autocomplete="off"
                  class="flex-1 border-0 bg-transparent py-3.5 text-sm text-gray-900 placeholder:text-gray-400 focus:ring-0 dark:text-white dark:placeholder:text-gray-500"
                />
                <kbd class="hidden sm:inline-flex items-center rounded border border-gray-300 px-1.5 py-0.5 text-xs text-gray-400 dark:border-gray-600 dark:text-gray-500">
                  esc
                </kbd>
              </div>

              <div class="max-h-80 overflow-y-auto px-2 py-2">
                <%= if @query != "" and map_size(@results) == 0 do %>
                  <p class="py-8 text-center text-sm text-gray-500 dark:text-gray-400">
                    No results found.
                  </p>
                <% end %>

                <%= for {category, items} <- @results do %>
                  <div class="mb-2">
                    <p class="px-3 py-1.5 text-xs font-semibold uppercase tracking-wider text-gray-500 dark:text-gray-400">
                      {category_label(category)}
                    </p>
                    <%= for {item, idx} <- Enum.with_index(items) do %>
                      <% global_idx = global_index(@results, category, idx) %>
                      <.link
                        navigate={item.url}
                        class={[
                          "flex items-center gap-3 rounded-lg px-3 py-2 text-sm cursor-pointer",
                          if(global_idx == @selected_index,
                            do: "bg-blue-50 text-blue-700 dark:bg-blue-900/30 dark:text-blue-300",
                            else:
                              "text-gray-700 hover:bg-gray-100 dark:text-gray-300 dark:hover:bg-white/5"
                          )
                        ]}
                      >
                        <.icon
                          name={category_icon(category)}
                          class="h-4 w-4 flex-shrink-0 opacity-60"
                        />
                        <div class="min-w-0 flex-1">
                          <p class="truncate font-medium">{item.label}</p>
                          <p :if={item.sublabel} class="truncate text-xs opacity-60">
                            {item.sublabel}
                          </p>
                        </div>
                      </.link>
                    <% end %>
                  </div>
                <% end %>

                <%= if @query == "" do %>
                  <p class="py-8 text-center text-sm text-gray-500 dark:text-gray-400">
                    Start typing to search...
                  </p>
                <% end %>
              </div>

              <div class="flex items-center justify-between border-t border-gray-200 px-4 py-2 text-xs text-gray-400 dark:border-white/10 dark:text-gray-500">
                <div class="flex gap-2">
                  <span><kbd class="font-semibold">↑↓</kbd> navigate</span>
                  <span><kbd class="font-semibold">↵</kbd> open</span>
                  <span><kbd class="font-semibold">esc</kbd> close</span>
                </div>
              </div>
            </div>
          </div>
        </div>
      <% end %>
    </div>
    """
  end

  defp category_label(:devices), do: "Devices"
  defp category_label(:sites), do: "Sites"
  defp category_label(:accounts), do: "Accounts"
  defp category_label(:alerts), do: "Alerts"
  defp category_label(other), do: to_string(other)

  defp category_icon(:devices), do: "hero-server"
  defp category_icon(:sites), do: "hero-building-office"
  defp category_icon(:accounts), do: "hero-user-group"
  defp category_icon(:alerts), do: "hero-bell-alert"
  defp category_icon(_), do: "hero-magnifying-glass"

  defp flat_results(results) do
    Enum.flat_map([:devices, :sites, :accounts, :alerts], fn cat ->
      Map.get(results, cat, [])
    end)
  end

  defp flat_results_count(results), do: length(flat_results(results))

  defp global_index(results, category, local_idx) do
    order = [:devices, :sites, :accounts, :alerts]

    offset =
      order
      |> Enum.take_while(&(&1 != category))
      |> Enum.reduce(0, fn cat, acc -> acc + length(Map.get(results, cat, [])) end)

    offset + local_idx
  end
end