import { UserError } from 'n8n-workflow';

export type WrappableError = Record<string, unknown>;

/**
 * Properties that control error identity and reporting. The payload comes
 * from JSON, so these must not overwrite the values this class sets.
 */
const PROTECTED_PROPERTIES = new Set(['name', 'message', 'level', 'shouldReport', 'stack']);

/**
 * Errors received from the task runner are not instances of Error.
 * This class wraps them in an Error instance and makes all their
 * properties available.
 */
export class WrappedExecutionError extends UserError {
	[key: string]: unknown;

	constructor(error: WrappableError) {
		const message = typeof error.message === 'string' ? error.message : 'Unknown error';
		super(message, {
			cause: error,
		});
		this.name = 'WrappedExecutionError';

		this.copyErrorProperties(error);
	}

	private copyErrorProperties(error: WrappableError) {
		for (const key of Object.getOwnPropertyNames(error)) {
			if (PROTECTED_PROPERTIES.has(key)) continue;
			this[key] = error[key];
		}
	}
}

export function isWrappableError(error: unknown): error is WrappableError {
	return typeof error === 'object' && error !== null;
}