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

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

  @default_port          443
  @default_warn_days     30
  @default_critical_days 7

  @impl true
  def display_name, do: "TLS Certificate"

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

  @impl true
  def render(assigns) do
    result = assigns[:result]

    days_label =
      if result do
        d = result.days_remaining
        cond do
          d < 0  -> "Expired #{abs(d)}d ago"
          d == 0 -> "Expires today"
          true   -> "#{d} days"
        end
      end

    days_class =
      if result do
        d       = result.days_remaining
        warn    = result[:warn_days]     || @default_warn_days
        crit    = result[:critical_days] || @default_critical_days

        cond do
          d <= crit -> "text-error"
          d <= warn -> "text-warning"
          true      -> "text-success"
        end
      else
        ""
      end

    assigns = Map.merge(assigns, %{
      result:      result,
      days_label:  days_label,
      days_class:  days_class
    })

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

      <div :if={@result} class="grid grid-cols-2 gap-2">
        <div class="bg-base-200 rounded-lg px-3 py-2 text-center">
          <p class="text-xs text-base-content/40">Expiry</p>
          <p class={"text-sm font-mono font-semibold #{@days_class}"}><%= @days_label %></p>
        </div>
        <div class="bg-base-200 rounded-lg px-3 py-2 text-center">
          <p class="text-xs text-base-content/40">Not After</p>
          <p class="text-xs font-mono font-semibold text-base-content">
            <%= @result.not_after |> Date.to_string() %>
          </p>
        </div>
      </div>

      <div :if={@result} class="text-xs text-base-content/40 space-y-0.5">
        <p>
          <span class="text-base-content/30">Subject:</span>
          <span class="font-mono"><%= @result.subject %></span>
        </p>
        <p>
          <span class="text-base-content/30">Issuer:</span>
          <span class="font-mono"><%= @result.issuer %></span>
        </p>
      </div>

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

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

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