defmodule SimpleshopThemeWeb.Admin.Dashboard do
  use SimpleshopThemeWeb, :live_view

  alias SimpleshopTheme.{Cart, Orders, Setup}

  @impl true
  def mount(_params, _session, socket) do
    status = Setup.setup_status()
    status_counts = Orders.count_orders_by_status()
    paid_count = Map.get(status_counts, "paid", 0)
    recent_orders = Orders.list_orders(status: "paid") |> Enum.take(5)

    {:ok,
     socket
     |> assign(:page_title, "Dashboard")
     |> assign(:setup, status)
     |> assign(:paid_count, paid_count)
     |> assign(:revenue, Orders.total_revenue())
     |> assign(:recent_orders, recent_orders)}
  end

  @impl true
  def render(assigns) do
    ~H"""
    <.header>
      Dashboard
    </.header>

    <%!-- Setup checklist (when not fully set up) --%>
    <.setup_checklist :if={!@setup.site_live} setup={@setup} />

    <%!-- Stats --%>
    <div class="grid grid-cols-1 sm:grid-cols-3 gap-4 mt-6">
      <.stat_card
        label="Orders"
        value={@paid_count}
        icon="hero-shopping-bag"
        href={~p"/admin/orders"}
      />
      <.stat_card
        label="Revenue"
        value={format_revenue(@revenue)}
        icon="hero-banknotes"
        href={~p"/admin/orders"}
      />
      <.stat_card
        label="Products"
        value={@setup.product_count}
        icon="hero-cube"
        href={~p"/admin/settings"}
      />
    </div>

    <%!-- Recent orders --%>
    <section class="mt-8">
      <div class="flex items-center justify-between mb-4">
        <h2 class="text-lg font-semibold">Recent orders</h2>
        <.link navigate={~p"/admin/orders"} class="text-sm text-zinc-500 hover:text-zinc-700">
          View all &rarr;
        </.link>
      </div>

      <%= if @recent_orders == [] do %>
        <div class="rounded-lg border border-zinc-200 p-8 text-center text-zinc-500">
          <.icon name="hero-inbox" class="size-10 mx-auto mb-3 text-zinc-300" />
          <p class="font-medium">No orders yet</p>
          <p class="text-sm mt-1">Orders will appear here once customers check out.</p>
        </div>
      <% else %>
        <div class="overflow-x-auto">
          <table class="w-full text-sm">
            <thead>
              <tr class="border-b border-zinc-200 text-left text-zinc-500">
                <th class="pb-2 font-medium">Order</th>
                <th class="pb-2 font-medium">Date</th>
                <th class="pb-2 font-medium">Customer</th>
                <th class="pb-2 font-medium text-right">Total</th>
                <th class="pb-2 font-medium">Fulfilment</th>
              </tr>
            </thead>
            <tbody>
              <tr
                :for={order <- @recent_orders}
                class="border-b border-zinc-100 hover:bg-zinc-50 cursor-pointer"
                phx-click={JS.navigate(~p"/admin/orders/#{order}")}
              >
                <td class="py-2.5 font-medium">{order.order_number}</td>
                <td class="py-2.5 text-zinc-600">{format_date(order.inserted_at)}</td>
                <td class="py-2.5 text-zinc-600">{order.customer_email || "—"}</td>
                <td class="py-2.5 text-right">{Cart.format_price(order.total)}</td>
                <td class="py-2.5"><.fulfilment_pill status={order.fulfilment_status} /></td>
              </tr>
            </tbody>
          </table>
        </div>
      <% end %>
    </section>
    """
  end

  # -- Function components --

  attr :setup, :map, required: true

  defp setup_checklist(assigns) do
    steps = [
      %{done: assigns.setup.admin_created, label: "Create admin account", href: nil},
      %{
        done: assigns.setup.printify_connected,
        label: "Connect to Printify",
        href: ~p"/admin/providers/new"
      },
      %{done: assigns.setup.products_synced, label: "Sync products", href: nil},
      %{done: assigns.setup.stripe_connected, label: "Connect Stripe", href: ~p"/admin/settings"},
      %{done: assigns.setup.site_live, label: "Go live", href: ~p"/admin/settings"}
    ]

    done_count = Enum.count(steps, & &1.done)
    assigns = assign(assigns, steps: steps, done_count: done_count, total: length(steps))

    ~H"""
    <div class="mt-6 rounded-lg border border-zinc-200 p-5">
      <div class="flex items-center justify-between mb-3">
        <h2 class="font-semibold">Setup progress</h2>
        <span class="text-sm text-zinc-500">{@done_count}/{@total}</span>
      </div>
      <div class="w-full bg-zinc-100 rounded-full h-2 mb-4">
        <div
          class="bg-green-500 h-2 rounded-full transition-all"
          style={"width: #{@done_count / @total * 100}%"}
        >
        </div>
      </div>
      <ul class="space-y-2">
        <li :for={step <- @steps} class="flex items-center gap-2 text-sm">
          <%= if step.done do %>
            <.icon name="hero-check-circle" class="size-5 text-green-500 shrink-0" />
            <span class="text-zinc-500 line-through">{step.label}</span>
          <% else %>
            <.icon name="hero-circle-stack" class="size-5 text-zinc-300 shrink-0" />
            <%= if step.href do %>
              <.link navigate={step.href} class="text-zinc-700 hover:underline">{step.label}</.link>
            <% else %>
              <span class="text-zinc-700">{step.label}</span>
            <% end %>
          <% end %>
        </li>
      </ul>
    </div>
    """
  end

  attr :label, :string, required: true
  attr :value, :any, required: true
  attr :icon, :string, required: true
  attr :href, :string, required: true

  defp stat_card(assigns) do
    ~H"""
    <.link
      navigate={@href}
      class="rounded-lg border border-zinc-200 p-4 hover:border-zinc-300 transition-colors"
    >
      <div class="flex items-center gap-3">
        <div class="rounded-lg bg-zinc-100 p-2">
          <.icon name={@icon} class="size-5 text-zinc-600" />
        </div>
        <div>
          <p class="text-2xl font-bold">{@value}</p>
          <p class="text-sm text-zinc-500">{@label}</p>
        </div>
      </div>
    </.link>
    """
  end

  defp fulfilment_pill(assigns) do
    {color, label} =
      case assigns.status do
        "unfulfilled" -> {"bg-zinc-100 text-zinc-600", "unfulfilled"}
        "submitted" -> {"bg-blue-50 text-blue-700", "submitted"}
        "processing" -> {"bg-amber-50 text-amber-700", "processing"}
        "shipped" -> {"bg-purple-50 text-purple-700", "shipped"}
        "delivered" -> {"bg-green-50 text-green-700", "delivered"}
        "failed" -> {"bg-red-50 text-red-700", "failed"}
        _ -> {"bg-zinc-100 text-zinc-600", assigns.status || "—"}
      end

    assigns = assign(assigns, color: color, label: label)

    ~H"""
    <span class={["inline-flex rounded-full px-2 py-0.5 text-xs font-medium", @color]}>
      {@label}
    </span>
    """
  end

  defp format_revenue(amount_pence) when is_integer(amount_pence) do
    Cart.format_price(amount_pence)
  end

  defp format_revenue(_), do: "£0.00"

  defp format_date(datetime) do
    Calendar.strftime(datetime, "%d %b %Y")
  end
end