/*
 * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
 * SPDX-License-Identifier: Apache-2.0.
 */

/**
 * @packageDocumentation
 */


/**
 * Converts payload to Buffer or string regardless of the supplied type
 * @param payload The payload to convert
 * @internal
 */
export function normalize_payload(payload: any): Buffer | string {
    if (payload instanceof Buffer) {
        // pass Buffer through
        return payload;
    }
    if (typeof payload === 'string') {
        // pass string through
        return payload;
    }
    if (ArrayBuffer.isView(payload)) {
        // return Buffer with view upon the same bytes (no copy)
        const view = payload as ArrayBufferView;
        return Buffer.from(view.buffer, view.byteOffset, view.byteLength);
    }
    if (payload instanceof ArrayBuffer) {
        // return Buffer with view upon the same bytes (no copy)
        return Buffer.from(payload);
    }
    if (typeof payload === 'object') {
        // Convert Object to JSON string
        return JSON.stringify(payload);
    }

    if (!payload) {
        return "";
    }

    throw new TypeError("payload parameter must be a string, object, or DataView.");
}

/** @internal */
export const DEFAULT_KEEP_ALIVE : number = 1200;