defmodule Integrations.Smtp.Display do
  @moduledoc """
  Dashboard panel for `Integrations.Smtp` (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.Smtp` starts, the same as if they were still one module.
  """

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

  @default_port 25

  @impl true
  def display_name, do: "SMTP"

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

  @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 || smtp_title(@config.params) %>
          </h2>
          <p class="text-xs font-mono text-base-content/40 truncate">
            <%= @result && @result.banner %>
          </p>
        </div>
        <CodeNameRaven.MonitorComponents.status_chip status={@status} />
      </div>

      <div :if={@result} class="flex gap-2 flex-wrap">
        <CodeNameRaven.MonitorComponents.stat
          label="Banner"
          value={"#{@result.banner_code}"} />
        <CodeNameRaven.MonitorComponents.stat
          label="Time to Banner"
          value={"#{@result.banner_ms} ms"} />
        <CodeNameRaven.MonitorComponents.stat
          :if={@result.ehlo_attempted}
          label="EHLO"
          value={if @result.ehlo_ok, do: "OK", else: "Failed"} />
      </div>

      <div :if={@result && @result.capabilities != []} class="flex flex-wrap gap-1">
        <span :for={cap <- @result.capabilities}
              class="text-xs font-mono bg-base-200 rounded px-1.5 py-0.5 text-base-content/60">
          <%= cap %>
        </span>
      </div>

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

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

  defp smtp_title(params) do
    host = params[:host] || params["host"] || "?"
    port = parse_int(params[:port] || params["port"], @default_port)
    "#{host}:#{port}"
  end

  defp parse_int(nil, default), do: default
  defp parse_int(v, _) when is_integer(v), do: v
  defp parse_int(v, default) when is_binary(v) do
    case Integer.parse(v) do
      {n, _} -> n
      :error -> default
    end
  end
  defp parse_int(_, default), do: default
end