defmodule CKEditor5.Components.Editor do
  @moduledoc """
  LiveView component for CKEditor 5 integration in Phoenix Framework.

  This module provides the necessary functionality to render and manage
  CKEditor 5 instances within Phoenix LiveView applications.
  """

  use Phoenix.Component

  import CKEditor5.Components.FormAttrs

  alias CKEditor5.Components.Editor.Assigns
  alias CKEditor5.Components.HiddenInput
  alias CKEditor5.Preset.EditorType

  @doc """
  Renders the CKEditor 5 component in a LiveView.
  """
  attr :id, :string, required: false, doc: "The ID for the editor instance."

  attr :context_id, :string,
    required: false,
    default: nil,
    doc: "The context ID for the editor, used for multi-root editors."

  attr :class, :string,
    required: false,
    default: "",
    doc: "Additional CSS classes to apply to the editor container."

  attr :style, :string,
    required: false,
    default: "",
    doc: "Inline styles to apply to the editor container."

  attr :preset, :any, default: "default", doc: "The name or reference of the preset to use."

  attr :change_event, :boolean,
    default: false,
    doc:
      "Whether the editor should push events to the LiveView. If true, the editor will send `ckeditor5:change` event every time the content changes."

  attr :focus_event, :boolean,
    default: false,
    doc:
      "Whether the editor should push events to the LiveView when it gains focus. If true, the editor will send `ckeditor5:focus` event when it gains focus."

  attr :blur_event, :boolean,
    default: false,
    doc:
      "Whether the editor should push events to the LiveView when it loses focus. If true, the editor will send `ckeditor5:blur` event when it loses focus."

  attr :ready_event, :boolean,
    default: false,
    doc:
      "Whether the editor should notify the LiveView when it has finished initializing. If true, the editor will send `ckeditor5:ready` event once when it is ready."

  attr :editable_height, :string,
    default: nil,
    required: false,
    doc:
      "The height of the editable area (e.g., \"300px\"). If not provided, the height will be determined by the editor's content."

  attr :save_debounce_ms, :integer,
    default: 400,
    required: false,
    doc: "Debounce time in ms for saving/syncing editor content."

  attr :type, :string,
    required: false,
    default: nil,
    doc: "The type of the editor. Overrides the type from the preset."

  attr :language, :string,
    required: false,
    default: nil,
    doc:
      "The language code for the editor UI (e.g., 'en', 'pl', 'de', etc.). If not provided, will use the default \"en\" language."

  attr :content_language, :string,
    required: false,
    default: nil,
    doc:
      "The content language code for the editor (e.g. 'en', 'pl', 'de', etc.). This is used to set the `lang` attribute on the editable area. " <>
        "If not provided, it will default to the same value as `language`."

  attr :watchdog, :boolean,
    default: true,
    doc:
      "Whether to enable the watchdog for the editor. If true, the component will automatically restart the editor if it crashes."

  attr :root_attrs, :map,
    required: false,
    default: %{},
    doc: "A map of HTML attributes to apply to the editor's root element(s)."

  attr :root_model_element, :string,
    default: nil,
    doc: """
    This is the name of the root element. Setting it to '$inlineRoot' enables you to
    use the editor in paragraph-like editing mode.
    """

  attr :upload_url, :string,
    required: false,
    default: nil,
    doc:
      "The URL endpoint for image uploads. If not provided, the default upload endpoint will be used if configured in the application config. " <>
        "Set to \"base64\" to use Base64 upload adapter."

  slot :inner_block,
    required: false,
    doc: "Optional content to render inside the editor container."

  form_attrs()

  def render(assigns) do
    assigns = Assigns.prepare(assigns)

    ~H"""
    <div
      id={@id}
      class={@class}
      style={@style}
      phx-hook="CKEditor5"
      phx-update="ignore"
      data-cke-preset={Jason.encode!(@preset)}
      data-cke-root-attrs={JSON.encode!(@root_attrs || {})}
      data-cke-root-model-element-name={@root_model_element}
      data-cke-editable-height={@editable_height}
      data-cke-initial-value={@value || ""}
      data-cke-change-event={@change_event}
      data-cke-blur-event={@blur_event}
      data-cke-focus-event={@focus_event}
      data-cke-ready-event={@ready_event}
      data-cke-save-debounce-ms={@save_debounce_ms}
      data-cke-language={@language}
      data-cke-content-language={@content_language}
      data-cke-watchdog={@watchdog}
      data-cke-context-id={@context_id}
    >
      <%= unless EditorType.has_external_editables?(@preset.type) do %>
        <div id={"#{@id}_editor"} data-cke-controlled></div>
      <% end %>

      <%= if @name do %>
        <HiddenInput.render
          id={"#{@id}_input"}
          name={@name}
          value={@value}
          required={@required}
        />
      <% end %>
    </div>

    <%= render_slot(@inner_block) %>
    """
  end
end