/**
 * @license
 * Copyright The Closure Library Authors.
 * SPDX-License-Identifier: Apache-2.0
 */

/**
 * @fileoverview Closure user agent platform detection.
 * @see <a href="http://www.useragentstring.com/">User agent strings</a>
 * For more information on browser brand, rendering engine, or device see the
 * other sub-namespaces in goog.labs.userAgent (browser, engine, and device
 * respectively).
 */

goog.module('goog.labs.userAgent.platform');
goog.module.declareLegacyNamespace();

const googString = goog.require('goog.string.internal');
const util = goog.require('goog.labs.userAgent.util');

/**
 * @return {boolean} Whether the platform is Android.
 */
function isAndroid() {
  return util.matchUserAgent('Android');
}

/**
 * @return {boolean} Whether the platform is iPod.
 */
function isIpod() {
  return util.matchUserAgent('iPod');
}

/**
 * @return {boolean} Whether the platform is iPhone.
 */
function isIphone() {
  return util.matchUserAgent('iPhone') && !util.matchUserAgent('iPod') &&
      !util.matchUserAgent('iPad');
}

/**
 * Returns whether the platform is iPad.
 * Note that iPadOS 13+ spoofs macOS Safari by default in its user agent, and in
 * this scenario the platform will not be recognized as iPad. If you must have
 * iPad-specific behavior, use
 * {@link goog.labs.userAgent.extra.isSafariDesktopOnMobile}.
 * @return {boolean} Whether the platform is iPad.
 */
function isIpad() {
  return util.matchUserAgent('iPad');
}

/**
 * Returns whether the platform is iOS.
 * Note that iPadOS 13+ spoofs macOS Safari by default in its user agent, and in
 * this scenario the platform will not be recognized as iOS. If you must have
 * iPad-specific behavior, use
 * {@link goog.labs.userAgent.extra.isSafariDesktopOnMobile}.
 * @return {boolean} Whether the platform is iOS.
 */
function isIos() {
  return isIphone() || isIpad() || isIpod();
}

/**
 * @return {boolean} Whether the platform is Mac.
 */
function isMacintosh() {
  return util.matchUserAgent('Macintosh');
}

/**
 * Note: ChromeOS is not considered to be Linux as it does not report itself
 * as Linux in the user agent string.
 * @return {boolean} Whether the platform is Linux.
 */
function isLinux() {
  return util.matchUserAgent('Linux');
}

/**
 * @return {boolean} Whether the platform is Windows.
 */
function isWindows() {
  return util.matchUserAgent('Windows');
}

/**
 * @return {boolean} Whether the platform is ChromeOS.
 */
function isChromeOS() {
  return util.matchUserAgent('CrOS');
}

/**
 * @return {boolean} Whether the platform is Chromecast.
 */
function isChromecast() {
  return util.matchUserAgent('CrKey');
}

/**
 * @return {boolean} Whether the platform is KaiOS.
 */
function isKaiOS() {
  return util.matchUserAgentIgnoreCase('KaiOS');
}

/**
 * The version of the platform. We only determine the version for Windows,
 * Mac, and Chrome OS. It doesn't make much sense on Linux. For Windows, we only
 * look at the NT version. Non-NT-based versions (e.g. 95, 98, etc.) are given
 * version 0.0.
 *
 * @return {string} The platform version or empty string if version cannot be
 *     determined.
 */
function getVersion() {
  const userAgentString = util.getUserAgent();
  let version = '', re;
  if (isWindows()) {
    re = /Windows (?:NT|Phone) ([0-9.]+)/;
    const match = re.exec(userAgentString);
    if (match) {
      version = match[1];
    } else {
      version = '0.0';
    }
  } else if (isIos()) {
    re = /(?:iPhone|iPod|iPad|CPU)\s+OS\s+(\S+)/;
    const match = re.exec(userAgentString);
    // Report the version as x.y.z and not x_y_z
    version = match && match[1].replace(/_/g, '.');
  } else if (isMacintosh()) {
    re = /Mac OS X ([0-9_.]+)/;
    const match = re.exec(userAgentString);
    // Note: some old versions of Camino do not report an OSX version.
    // Default to 10.
    version = match ? match[1].replace(/_/g, '.') : '10';
  } else if (isKaiOS()) {
    re = /(?:KaiOS)\/(\S+)/i;
    const match = re.exec(userAgentString);
    version = match && match[1];
  } else if (isAndroid()) {
    re = /Android\s+([^\);]+)(\)|;)/;
    const match = re.exec(userAgentString);
    version = match && match[1];
  } else if (isChromeOS()) {
    re = /(?:CrOS\s+(?:i686|x86_64)\s+([0-9.]+))/;
    const match = re.exec(userAgentString);
    version = match && match[1];
  }
  return version || '';
}

/**
 * @param {string|number} version The version to check.
 * @return {boolean} Whether the browser version is higher or the same as the
 *     given version.
 */
function isVersionOrHigher(version) {
  return googString.compareVersions(getVersion(), version) >= 0;
}

exports = {
  getVersion,
  isAndroid,
  isChromeOS,
  isChromecast,
  isIos,
  isIpad,
  isIphone,
  isIpod,
  isKaiOS,
  isLinux,
  isMacintosh,
  isVersionOrHigher,
  isWindows,
};