defmodule Integrations.Dns.Display do
  @moduledoc """
  Dashboard panel for `Integrations.Dns` (same package).

  Nested under the monitor's own namespace deliberately — the package's
  top-level module name never changes, and this module's name is
  guaranteed distinct from any separately-published standalone display
  package. `Display.BundledDefault` auto-hooks this whenever
  `Integrations.Dns` starts, the same as if they were still one module.
  """

  use CodeNameRaven.Display, category: :infrastructure, size_hint: :medium

  @default_type "A"
  @default_port 53

  @impl true
  def display_name, do: "DNS"

  @impl true
  def compatible_monitors, do: [Integrations.Dns]

  @impl true
  def render(assigns) do
    result = assigns[:result]
    assigns = Map.merge(assigns, %{result: result})

    ~H"""
    <div class="space-y-3">
      <div class="flex items-start justify-between gap-2">
        <div class="min-w-0">
          <h2 class="text-sm font-semibold text-base-content truncate">
            <%= @config.name || dns_title(@config.params) %>
          </h2>
          <p class="text-xs font-mono text-base-content/40 truncate">
            <%= dns_subtitle(@config.params) %>
          </p>
        </div>
        <CodeNameRaven.MonitorComponents.status_chip status={@status} />
      </div>

      <div :if={@result} class="grid grid-cols-2 gap-2">
        <CodeNameRaven.MonitorComponents.stat
          label="Latency"
          value={"#{@result.latency_ms} ms"} />
        <CodeNameRaven.MonitorComponents.stat
          label="Answers"
          value={"#{length(@result.answers)} #{@result.type}"} />
      </div>

      <div :if={@result && @result.answers != []} class="space-y-1">
        <div :for={answer <- @result.answers}
             class="text-xs font-mono text-base-content/60 bg-base-200 rounded px-2 py-1">
          <%= answer %>
        </div>
      </div>

      <div :if={@result && @result.expected && not @result.matched}
           class="text-xs text-warning font-mono">
        Expected: <%= @result.expected %>
      </div>

      <CodeNameRaven.MonitorComponents.error_message message={@last_error} />
      <CodeNameRaven.MonitorComponents.check_time checked_at={@last_checked_at} />
    </div>
    """
  end

  # ---------------------------------------------------------------------------
  # Helpers
  # ---------------------------------------------------------------------------

  defp dns_title(params) do
    query = params[:query] || params["query"] || "DNS"
    type  = params[:type]  || params["type"]  || @default_type
    "#{query} (#{type})"
  end

  defp dns_subtitle(params) do
    ns   = params[:nameserver] || params["nameserver"] || "?"
    port = params[:nameserver_port] || params["nameserver_port"] || @default_port
    "#{ns}:#{port}"
  end
end