module Scrivito

class UiConfig < Struct.new(:editing_context, :resource, :return_to, :app_extension_tags,
                            :obj_models, :widget_models)
  def initialize(**named_params)
    named_params.each { |key, value| self[key] = value }
  end

  def to_json
    {
      app_extension_tags:  app_extension_tags,
      editing_context:     editing_context_config,
      session:             session_config,
      backend_endpoint:    Configuration.endpoint,
      tenant:              Configuration.tenant,
      i18n:                i18n_config,
      is_development_mode: Rails.env.development?,
      resource_dialog:     resource_dialog_config,
      revision:            revision_config,
      user:                user_config,
      user_permissions:    user_permissions_config,
      obj_class:           obj_class_config,
      widget_class:        widget_class_config,
    }.to_json
  end

  private

  def editing_context_config
    {
      display_mode:       editing_context.display_mode,
      selected_workspace: workspace_config(selected_workspace),
      visible_workspace:  workspace_config(visible_workspace),
    }
  end

  def session_config
    Session.renew(SecureRandom.hex(8), editor)
  end

  def workspace_config(workspace)
    {
      id: workspace.id,
      memberships: workspace.memberships.map do |membership|
        {
          user_id: membership.user_id,
          role: membership.role,
          description: membership.user.description
        }
      end,
      outdated: workspace.outdated?,
      auto_update: workspace.auto_update?,
      title: workspace.title,
    }
  end

  def i18n_config
    {locale: Scrivito::Configuration.ui_locale || I18n.locale}
  end

  def obj_class_config
    obj_models.map(&:as_json)
  end

  def widget_class_config
    widget_models.map(&:as_json)
  end

  def resource_dialog_config
    return {} unless resource
    {
      obj: Configuration.obj_formats.fetch('_default').call(resource, editor),
      return_to: return_to,
    }
  end

  def user_permissions_config
    {
      create_workspace: editor.can?(:create, :workspace),
      rename_workspace: editor.can?(:write, selected_workspace),
      invite_to_workspace: editor.can?(:invite_to, selected_workspace),
      rebase_workspace: editor.can?(:write, selected_workspace),
      delete_workspace: editor.can?(:delete, selected_workspace),
      publish_workspace: editor.can?(:publish, selected_workspace),
    }
  end

  def user_config
    {
      current: editor.as_json,
    }
  end

  def revision_config
    {published_revision_id: Workspace.published.revision_id}
  end

  def editor
    editing_context.editor
  end

  def selected_workspace
    editing_context.selected_workspace
  end

  def visible_workspace
    editing_context.visible_workspace
  end
end

end