import { IWorkspace } from '../../../../vs/platform/workspace/common/workspace';
import { URI } from '../../../../vs/base/common/uri';

export const WORKSPACE_EXTENSION = 'code-workspace';

//#endregion

//#region Identifiers / Payload

export interface IBaseWorkspaceIdentifier {
  /**
   * Every workspace (multi-root, single folder or empty)
   * has a unique identifier. It is not possible to open
   * a workspace with the same `id` in multiple windows
   */
  id: string;
}

/**
 * A single folder workspace identifier is a path to a folder + id.
 */
export interface ISingleFolderWorkspaceIdentifier
  extends IBaseWorkspaceIdentifier {
  /**
   * Folder path as `URI`.
   */
  uri: URI;
}

export function isSingleFolderWorkspaceIdentifier(
  obj: unknown
): obj is ISingleFolderWorkspaceIdentifier {
  const singleFolderIdentifier = obj as
    | ISingleFolderWorkspaceIdentifier
    | undefined;

  return (
    typeof singleFolderIdentifier?.id === 'string' &&
    URI.isUri(singleFolderIdentifier.uri)
  );
}

/**
 * A multi-root workspace identifier is a path to a workspace file + id.
 */
export interface IWorkspaceIdentifier extends IBaseWorkspaceIdentifier {
  /**
   * Workspace config file path as `URI`.
   */
  configPath: URI;
}

export function toWorkspaceIdentifier(
  workspace: IWorkspace
): IWorkspaceIdentifier | ISingleFolderWorkspaceIdentifier | undefined {
  // Multi root
  if (workspace.configuration) {
    return {
      id: workspace.id,
      configPath: workspace.configuration,
    };
  }

  // Single folder
  if (workspace.folders.length === 1) {
    return {
      id: workspace.id,
      uri: workspace.folders[0].uri,
    };
  }

  // Empty workspace
  return undefined;
}

export interface IRawFileWorkspaceFolder {}

export interface IRawUriWorkspaceFolder {}

export type IStoredWorkspaceFolder =
  | IRawFileWorkspaceFolder
  | IRawUriWorkspaceFolder;

//#endregion