defmodule Shino.Notification do
  @moduledoc """
  A drop-in replacement for notification system in Phoenix.

  ## Usage

  Add following components to your `app.html.heex`:

  ```heex
  <Shino.Notification.connection_group position={:top} />
  <Shino.Notification.notification_group flash={@flash} connected={assigns[:socket] != nil} />
  ```

  Then, use following functions to send flash or toast:

    * `put_flash/3`
    * `Shino.Notification.put_toast/_`
    * `Shino.Notification.send_toast/_`

  """

  use Phoenix.Component

  alias Shino.Notification.Flash
  alias Shino.Notification.LiveComponent
  alias Shino.Notification.System

  defdelegate connection_group(assigns), to: System

  @doc """
  Renders a notification group for DeadView and LiveView.

    * For DeadView, it only renders flashes.
    * For LiveView, it renders flashes and toasts.

  """
  attr :id, :string, default: "notification-group", doc: "the DOM id of notification group"

  attr :position, :atom,
    values: [:top_left, :top_right, :bottom_left, :bottom_right],
    default: :bottom_right,
    doc: "the location for showing notifications"

  attr :flash, :map, required: true, doc: "the map of flash messages"
  attr :connected, :boolean, default: false

  def notification_group(assigns) do
    default_classes =
      "fixed z-50 max-h-screen w-full md:max-w-[420px] p-4 grid pointer-events-none"

    class =
      case assigns.position do
        :bottom_left -> "bottom-0 left-0 #{default_classes} sm:top-auto items-end"
        :bottom_right -> "bottom-0 right-0 #{default_classes} sm:top-auto items-end"
        :top_left -> "top-0 left-0 #{default_classes} sm:bottom-auto items-start"
        :top_right -> "top-0 right-0 #{default_classes} sm:bottom-auto items-start"
      end

    assigns = assign(assigns, :class, class)

    ~H"""
    <%= if @connected do %>
      <.live_component id={@id} module={LiveComponent} class={@class} position={@position} f={@flash} />
    <% else %>
      <div id={@id} class={@class} data-position={@position}>
        <Flash.flashes group_id={@id} f={@flash} live={false} />
      </div>
    <% end %>
    """
  end

  defdelegate put_toast(socket, kind, message, options \\ []), to: LiveComponent
  defdelegate send_toast(kind, message, options \\ []), to: LiveComponent
end