/**
 * Copyright (c) Microsoft Corporation. All rights reserved.
 * Licensed under the MIT License.
 */
import { DialogContext } from './dialogContext'
import { ExceptionHelper } from '@microsoft/agents-activity'
import { Errors } from './errorHelper'
import { DialogInstance } from './dialogInstance'

/**
 * An Error that includes extra dialog context, including the dialog stack.
 */
export class DialogContextError extends Error {
  /**
     * Represents the state of a dialog when an error occurred.
     */
  readonly dialogContext: {
    activeDialog?: string;
    parent?: string;
    stack: DialogInstance[];
  }

  /**
     * Construct a DialogError.
     *
     * @param {Error | string} error Source error or error message.
     * @param {DialogContext} dialogContext Dialog context that is the source of the error.
     */
  constructor (
    readonly error: Error | string,
    dialogContext: DialogContext
  ) {
    super()

    if (!(error instanceof Error) && typeof error !== 'string') {
      throw ExceptionHelper.generateException(
        Error,
        Errors.InvalidErrorArgument
      )
    }

    if (!(dialogContext instanceof DialogContext)) {
      throw ExceptionHelper.generateException(
        Error,
        Errors.InvalidDialogContextArgument
      )
    }

    this.name = 'DialogContextError'
    this.message = error instanceof Error ? error.message : error

    this.dialogContext = {
      activeDialog: dialogContext.activeDialog?.id,
      parent: dialogContext.parent?.activeDialog?.id,
      stack: dialogContext.stack,
    }
  }
}