defmodule Usher.Web.Live.InvitationsList do
  @moduledoc false

  use Usher.Web, :live_view

  alias Usher.Invitation
  alias Usher.Web.Components.InvitationFormComponent
  alias Usher.Web.Config

  import Usher.Web.Helpers.DateTimeHelpers

  @impl Phoenix.LiveView
  def render(assigns) do
    ~H"""
    <div class="space-y-4">
      <div class="md:flex md:items-center md:justify-between">
        <div class="min-w-0 flex-1">
          <h2 class="text-2xl/7 font-bold text-zinc-900 dark:text-zinc-200 sm:truncate sm:text-3xl sm:tracking-tight">
            Invitations
          </h2>
          <p class="mt-1 text-sm text-zinc-600 dark:text-zinc-400">
            View and manage invitations.
          </p>
        </div>
      </div>

      <div class="bg-white shadow overflow-hidden sm:rounded-md overflow-x-auto">
        <.table id="invitations" rows={@streams.invitations}>
          <:col :let={{_id, invitation}} label="Name">
            <span class="text-sm font-bold text-zinc-900 dark:text-zinc-200">
              {invitation.name || "Unnamed"}
            </span>
          </:col>
          <:col :let={{_id, invitation}} label="Created">
            <time class="text-sm text-zinc-900 dark:text-zinc-200">
              {Calendar.strftime(invitation.inserted_at, "%b %d, %Y")}
            </time>
          </:col>
          <:col :let={{_id, invitation}} label="Expires">
            <span class={[
              "inline-flex items-center px-2.5 py-0.5 rounded-full text-xs font-medium",
              expires_at_class(invitation)
            ]}>
              {expires_at(invitation)}
            </span>
          </:col>
          <:col :let={{_id, invitation}} label="Usage">
            <div class="flex items-center space-x-2">
              <span class="text-sm font-medium text-zinc-900 dark:text-zinc-200">
                {invitation.joined_count}
              </span>
              <span class="text-sm text-zinc-900 dark:text-zinc-200">
                {if invitation.joined_count == 1, do: "user", else: "users"}
              </span>
            </div>
          </:col>
          <:col :let={{id, invitation}} label="Invitation Link">
            <div class="flex items-center space-x-2">
              <.link
                class="text-blue-600 hover:text-blue-800 text-sm font-mono truncate max-w-xs"
                href={token_link(invitation)}
                target="_blank"
              >
                {token_link(invitation) |> token_link_display_value()}
              </.link>
              <.button
                id={"copy-invitation-token-link-#{id}"}
                variant="light"
                class="text-zinc-700 bg-zinc-100 hover:bg-zinc-200 px-2 py-1"
                phx-hook="CopyToClipboard"
                data-clipboard-text={token_link(invitation)}
                title="Copy invitation link"
              >
                <.icon name="hero-clipboard" class="h-4 w-4" />
              </.button>
            </div>
          </:col>
          <:action :let={{_id, invitation}}>
            <div class="flex items-center justify-end space-x-2 pr-4">
              <.link patch={usher_path([invitation.id, :edit])}>
                <.button
                  variant="light"
                  class="text-blue-700 bg-blue-100 hover:bg-blue-200 px-3 py-2"
                  title="Edit invitation"
                >
                  <.icon name="hero-pencil" class="h-4 w-4" />
                </.button>
              </.link>
              <.button
                variant="light"
                class="text-red-700 bg-red-100 hover:bg-red-200 px-3 py-2"
                phx-click="delete_invitation"
                phx-value-id={invitation.id}
                title="Delete invitation"
              >
                <.icon name="hero-trash" class="h-4 w-4" />
              </.button>
            </div>
          </:action>
          <:empty_state>
            <div class="px-3 py-6 text-center">
              <.icon name="hero-inbox" class="mx-auto h-12 w-12 text-zinc-400" />
              <h3 class="mt-4 text-lg font-medium text-zinc-900 dark:text-zinc-200">
                No invitations yet
              </h3>
              <p class="mt-2 text-sm text-zinc-600 dark:text-zinc-400">
                Get started by creating your first invitation.
              </p>
              <div class="mt-6">
                <.link patch={usher_path([:new])}>
                  <.button variant="primary">
                    New Invitation
                  </.button>
                </.link>
              </div>
            </div>
          </:empty_state>
        </.table>
      </div>

      <.modal
        :if={@live_action in [:new, :edit]}
        id="invitation-modal"
        show
        on_cancel={JS.patch(usher_path())}
      >
        <.live_component
          module={Usher.Web.Components.InvitationFormComponent}
          id={@invitation.id || :new}
          title={if @live_action == :new, do: "New Invitation", else: "Edit Invitation"}
          action={@live_action}
          invitation={@invitation}
        />
      </.modal>

      <.modal
        :if={@delete_confirmation}
        id="delete-confirmation-modal"
        show={true}
        on_cancel={JS.push("cancel_delete_invitation")}
      >
        <div class="space-y-4">
          <h3 class="text-lg font-medium text-zinc-900 dark:text-zinc-200">Confirm Deletion</h3>
          <p class="text-zinc-700 dark:text-zinc-300">
            Are you sure you want to delete this invitation?
            This action cannot be undone and will invalidate the invitation link.
          </p>
          <div class="flex justify-end space-x-3 mt-5">
            <.button type="button" variant="light" phx-click="cancel_delete_invitation">
              Cancel
            </.button>
            <.button
              type="button"
              variant="danger"
              phx-click="confirm_delete_invitation"
              phx-value-id={@delete_confirmation.id}
            >
              <.icon name="hero-trash" class="h-4 w-4 mr-1" /> Delete
            </.button>
          </div>
        </div>
      </.modal>
    </div>
    """
  end

  @impl Phoenix.LiveView
  def mount(_params, _session, socket) do
    invitations =
      Usher.list_invitations()
      |> Enum.map(&add_usage_count/1)

    socket =
      socket
      |> assign(:delete_confirmation, nil)
      |> stream(:invitations, invitations)

    {:ok, socket}
  end

  @impl Phoenix.LiveView
  def handle_params(params, _url, socket) do
    {:noreply, apply_action(socket, socket.assigns.live_action, params)}
  end

  defp apply_action(socket, :index, _params) do
    socket
    |> assign(:invitation, nil)
  end

  defp apply_action(socket, :new, _params) do
    socket
    |> assign(:invitation, %Invitation{})
  end

  defp apply_action(socket, :edit, %{"id" => id}) do
    invitation = Usher.get_invitation!(id)

    socket
    |> assign(:invitation, invitation)
  end

  @impl Phoenix.LiveView
  def handle_info({InvitationFormComponent, {:saved, %Invitation{} = new_invitation}}, socket) do
    new_invitation = add_usage_count(new_invitation)

    socket =
      socket
      |> stream_insert(:invitations, new_invitation, at: 0)

    {:noreply, socket}
  end

  @impl Phoenix.LiveView
  def handle_info(
        {InvitationFormComponent, {:updated, %Invitation{} = updated_invitation}},
        socket
      ) do
    updated_invitation = add_usage_count(updated_invitation)

    socket =
      socket
      |> stream_insert(:invitations, updated_invitation, update_only: true)

    {:noreply, socket}
  end

  @impl Phoenix.LiveView
  def handle_event("delete_invitation", %{"id" => id}, socket) do
    invitation = Usher.get_invitation!(id)

    {:noreply, assign(socket, :delete_confirmation, invitation)}
  end

  @impl Phoenix.LiveView
  def handle_event("confirm_delete_invitation", %{"id" => id}, socket) do
    invitation = Usher.get_invitation!(id)
    {:ok, _} = Usher.delete_invitation(invitation)

    socket =
      socket
      |> stream_delete(:invitations, invitation)
      |> assign(:delete_confirmation, nil)
      |> put_flash(:info, "Invitation deleted successfully")

    {:noreply, socket}
  end

  @impl Phoenix.LiveView
  def handle_event("cancel_delete_invitation", _params, socket) do
    {:noreply, assign(socket, :delete_confirmation, nil)}
  end

  @impl Phoenix.LiveView
  def handle_event("copy-to-clipboard-success", _, socket) do
    socket =
      socket
      |> put_flash(:info, "Token link copied to clipboard")

    {:noreply, socket}
  end

  @impl Phoenix.LiveView
  def handle_event("copy-to-clipboard-error", %{"error" => error}, socket) do
    socket =
      socket
      |> put_flash(:error, "Failed to copy token link to clipboard: #{error}")

    {:noreply, socket}
  end

  defp token_link(invitation) do
    invitation_redirect_url = Config.invitation_redirect_url()

    Usher.invitation_url(invitation.token, invitation_redirect_url)
  end

  defp token_link_display_value(link) do
    String.slice(link, -1 * Usher.Config.token_length(), 20)
  end

  defp expires_at(%{expires_at: expires_at}) when is_struct(expires_at, DateTime) do
    time_left_until(expires_at)
  end

  defp expires_at(_), do: "Never"

  defp expires_at_class(invitation) do
    cond do
      is_nil(invitation.expires_at) ->
        "bg-green-100 text-green-800"

      DateTime.compare(invitation.expires_at, DateTime.utc_now()) == :lt ->
        "bg-red-100 text-red-800"

      DateTime.diff(invitation.expires_at, DateTime.utc_now(), :day) <= 7 ->
        "bg-yellow-100 text-yellow-800"

      true ->
        "bg-blue-100 text-blue-800"
    end
  end

  defp add_usage_count(invitation) do
    # Get unique users that registered using this invitation
    unique_registrations =
      Usher.list_invitation_usages_by_unique_entity(
        invitation,
        entity_type: :user,
        action: :registered
      )

    Map.put(invitation, :joined_count, length(unique_registrations))
  end
end