defmodule ToweropsWeb.Components.Skeletons do
  @moduledoc """
  Loading skeleton components for placeholder UI during data fetches.
  """
  use Phoenix.Component

  # Reusable skeleton block — a single pulsing bar
  defp skel(assigns) do
    assigns = assign_new(assigns, :class, fn -> "" end)

    ~H"""
    <div class={["rounded bg-gray-200 dark:bg-gray-700 skeleton-shimmer", @class]}></div>
    """
  end

  @doc """
  A pulsing card placeholder matching stat cards.
  """
  attr :class, :string, default: nil

  def skeleton_card(assigns) do
    ~H"""
    <div class={[
      "animate-pulse rounded-lg border border-gray-200 bg-white p-4 shadow-sm dark:border-white/10 dark:bg-gray-800/50",
      @class
    ]}>
      <.skel class="h-3 w-24" />
      <.skel class="mt-3 h-8 w-16" />
      <.skel class="mt-2 h-3 w-20" />
    </div>
    """
  end

  @doc """
  Table rows with pulsing placeholders.
  """
  attr :rows, :integer, default: 5
  attr :cols, :integer, default: 4

  def skeleton_table(assigns) do
    ~H"""
    <div class="overflow-hidden rounded-lg border border-gray-200 bg-white dark:border-white/10 dark:bg-gray-800/50">
      <!-- Header -->
      <div class="border-b border-gray-200 bg-gray-50 px-6 py-3.5 dark:border-white/10 dark:bg-gray-800/75">
        <div class="flex gap-8">
          <div
            :for={_ <- 1..@cols}
            class="h-3 w-20 animate-pulse rounded bg-gray-300 dark:bg-gray-600"
          >
          </div>
        </div>
      </div>
      <!-- Rows -->
      <div
        :for={i <- 1..@rows}
        class={[
          "border-b border-gray-100 px-6 py-4 last:border-0 dark:border-white/5",
          rem(i, 2) == 0 && "bg-gray-50/50 dark:bg-gray-800/25"
        ]}
      >
        <div class="flex items-center gap-8">
          <div class="h-3 w-24 animate-pulse rounded bg-gray-200 dark:bg-gray-700 skeleton-shimmer">
          </div>
          <div
            :for={_ <- 2..@cols}
            class="h-3 w-16 animate-pulse rounded bg-gray-200 dark:bg-gray-700 skeleton-shimmer"
          >
          </div>
        </div>
      </div>
    </div>
    """
  end

  @doc """
  A stat card skeleton (number + label placeholder).
  """
  attr :class, :string, default: nil

  def skeleton_stat(assigns) do
    ~H"""
    <div class={[
      "animate-pulse rounded-lg border border-gray-200 bg-white p-4 shadow-sm dark:border-white/10 dark:bg-gray-800/50",
      @class
    ]}>
      <div class="flex items-center gap-2">
        <div class="h-5 w-5 rounded bg-gray-200 dark:bg-gray-700 skeleton-shimmer"></div>
        <div class="h-3 w-20 rounded bg-gray-200 dark:bg-gray-700 skeleton-shimmer"></div>
      </div>
      <div class="mt-2 h-8 w-16 rounded bg-gray-200 dark:bg-gray-700 skeleton-shimmer"></div>
      <div class="mt-1.5 h-2.5 w-14 rounded bg-gray-200 dark:bg-gray-700 skeleton-shimmer"></div>
    </div>
    """
  end

  @doc """
  Dashboard loading skeleton — mirrors the real dashboard layout.
  """
  def skeleton_dashboard(assigns) do
    ~H"""
    <!-- Stat cards row -->
    <div class="mt-8 grid gap-4 sm:grid-cols-2 lg:grid-cols-3 xl:grid-cols-6">
      <.skeleton_stat :for={_ <- 1..6} />
    </div>
    <!-- Filter bar -->
    <div class="mt-6 flex flex-wrap items-center gap-3">
      <div
        :for={w <- [28, 24, 32, 20]}
        class={[
          "h-9 animate-pulse rounded-lg bg-gray-200 dark:bg-gray-700 skeleton-shimmer",
          "w-#{w}"
        ]}
      >
      </div>
    </div>
    <!-- Two-column content area -->
    <div class="mt-8 grid gap-8 lg:grid-cols-5">
      <!-- Main column: alerts/activity -->
      <div class="lg:col-span-3">
        <div class="h-5 w-32 animate-pulse rounded bg-gray-200 dark:bg-gray-700 skeleton-shimmer mb-4">
        </div>
        <div class="space-y-3">
          <div
            :for={_ <- 1..3}
            class="animate-pulse rounded-lg border border-gray-200 bg-white p-4 dark:border-white/10 dark:bg-gray-800/50"
          >
            <div class="flex items-center gap-3">
              <div class="h-8 w-8 rounded-full bg-gray-200 dark:bg-gray-700 skeleton-shimmer"></div>
              <div class="flex-1">
                <div class="h-3.5 w-40 rounded bg-gray-200 dark:bg-gray-700 skeleton-shimmer"></div>
                <div class="mt-2 h-3 w-64 rounded bg-gray-200 dark:bg-gray-700 skeleton-shimmer">
                </div>
              </div>
              <div class="h-3 w-12 rounded bg-gray-200 dark:bg-gray-700 skeleton-shimmer"></div>
            </div>
          </div>
        </div>
      </div>
      <!-- Sidebar column: recent/quick stats -->
      <div class="lg:col-span-2">
        <div class="h-5 w-24 animate-pulse rounded bg-gray-200 dark:bg-gray-700 skeleton-shimmer mb-4">
        </div>
        <div class="space-y-3">
          <div
            :for={_ <- 1..4}
            class="animate-pulse rounded-lg border border-gray-200 bg-white p-3 dark:border-white/10 dark:bg-gray-800/50"
          >
            <div class="flex items-center justify-between">
              <div class="h-3 w-28 rounded bg-gray-200 dark:bg-gray-700 skeleton-shimmer"></div>
              <div class="h-5 w-10 rounded-full bg-gray-200 dark:bg-gray-700 skeleton-shimmer"></div>
            </div>
          </div>
        </div>
      </div>
    </div>
    """
  end
end