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

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

  @impl true
  def display_name, do: "Kubernetes"

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

  @impl true
  def render(assigns) do
    result = assigns[:result]
    nodes  = (result && result.nodes) || []
    deps   = (result && result.deployments) || []
    pods   = (result && result.pods) || []

    not_ready_nodes = Enum.filter(nodes, &(&1.ready != true))
    degraded_deps   = Enum.filter(deps, fn d -> d.available < d.desired end)
    problem_pods    = Enum.filter(pods, fn p -> p.crash_looping or p.phase == "Failed" end)

    assigns = Map.merge(assigns, %{
      nodes:           nodes,
      deps:            deps,
      pods:            pods,
      not_ready_nodes: not_ready_nodes,
      degraded_deps:   degraded_deps,
      problem_pods:    problem_pods
    })

    ~H"""
    <div class="space-y-4">
      <div class="flex items-start justify-between gap-2">
        <h2 class="text-sm font-semibold text-base-content">Kubernetes</h2>
        <CodeNameRaven.MonitorComponents.status_chip status={@status} />
      </div>

      <div class="grid grid-cols-3 gap-2">
        <CodeNameRaven.MonitorComponents.stat
          label="Nodes"
          value={"#{Enum.count(@nodes, &(&1.ready == true))}/#{length(@nodes)} Ready"} />
        <CodeNameRaven.MonitorComponents.stat
          label="Deployments"
          value={"#{Enum.count(@deps, fn d -> d.available == d.desired end)}/#{length(@deps)} OK"} />
        <CodeNameRaven.MonitorComponents.stat
          label="Pods"
          value={"#{Enum.count(@pods, &(&1.phase == "Running"))}/#{length(@pods)} Running"} />
      </div>

      <div :if={@not_ready_nodes != []} class="space-y-1">
        <p class="text-xs font-semibold text-error">Not Ready Nodes</p>
        <div :for={n <- @not_ready_nodes}
             class="text-xs font-mono text-base-content/60 bg-error/10 rounded px-2 py-1">
          <%= n.name %>
          <span :if={n.roles != ""} class="text-base-content/40 ml-1">(<%= n.roles %>)</span>
        </div>
      </div>

      <div :if={@degraded_deps != []} class="space-y-1">
        <p class="text-xs font-semibold text-warning">Degraded Deployments</p>
        <div :for={d <- @degraded_deps}
             class="text-xs font-mono text-base-content/60 bg-warning/10 rounded px-2 py-1">
          <%= d.namespace %>/<%= d.name %>
          <span class="text-warning ml-1">(<%= d.available %>/<%= d.desired %> available)</span>
        </div>
      </div>

      <div :if={@problem_pods != []} class="space-y-1">
        <p class="text-xs font-semibold text-warning">Problem Pods</p>
        <div :for={p <- @problem_pods}
             class="text-xs font-mono text-base-content/60 bg-warning/10 rounded px-2 py-1">
          <%= p.namespace %>/<%= p.name %>
          <span class="text-error ml-1">
            <%= if p.crash_looping, do: "CrashLoopBackOff", else: p.phase %>
          </span>
        </div>
      </div>

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