// BSD-licensed, see COPYRIGHT file
// Copyright 2011, Ernst de Haan
package org.znerd.uasniffer;

import org.znerd.util.text.TextUtils;
import java.util.regex.Pattern;

/**
 * Class responsible for determining the user agent details.
 */
public final class Sniffer {

    private static final String[] UA_MOBILE_DEVICE_SNIPPETS = new String[] { "windows ce", "windowsce", "symbian", "nokia", "opera mini", "wget", "fennec", "opera mobi", "windows; ppc", "blackberry", "portable", "vita", "mobile" };
    private static final String[] UA_TABLET_DEVICE_SNIPPETS = new String[] { "ipad", "xoom", "tablet" };
    private static final String[] UA_MOBILE_DEVICE_WITHOUT_TEL_SUPPORT = new String[] { "opera/8.", "opera/7.", "opera/6.", "opera/5.", "opera/4.", "opera/3.", "ipod", "ipad", "tablet", "playstation" };
    private static final String[] UA_BOT_SNIPPETS = new String[] { "spider", "bot", "crawl", "miner", "checker", "java", "pingdom" };

    private Sniffer() {
    }

    /**
     * Analyzes the specified user agent string.
     * 
     * @param agentString
     *        the user agent string, cannot be <code>null</code>.
     * @return an {@link UserAgent} instance that describes the user agent, never <code>null</code>.
     * @throws IllegalArgumentException
     *         if <code>agentString == null</code>.
     */
    public static final UserAgent analyze(String agentString) throws IllegalArgumentException {
        UserAgent ua = new UserAgent(agentString);
        analyze(ua);
        return ua;
    }

    private static final void analyze(UserAgent ua) {

        String agentString = ua.getLowerCaseAgentString();

        // Detect specific devices
        boolean android = agentString.contains("android");
        boolean appleTouch = agentString.contains("ipod") || agentString.contains("iphone") || agentString.contains("ipad");
        boolean nook = agentString.contains("nook ") || agentString.contains("bntv250");
        boolean psp = agentString.contains("playstation portable") || agentString.contains("playstation vita");
        boolean kindleFire = agentString.contains("silk-accelerated"); // TODO

        // Mobile devices
        boolean matchFound = false;
        String uaType = "desktop";
        boolean isPhone = false;
        boolean isTablet = false;

        if (nook) {
            matchFound = true;
            uaType = "ereader";
            isPhone = false;
            isTablet = false;
        } else if (kindleFire) {
            matchFound = true;
            uaType = "ereader";
            isPhone = false;
            isTablet = true;
        } else {
            for (String mobileDeviceSnippet : UA_MOBILE_DEVICE_SNIPPETS) {
                if (agentString.contains(mobileDeviceSnippet)) {
                    matchFound = true;
                    uaType = "mobile";
                    isPhone = true;

                    for (String mobileWithoutTelSnippet : UA_MOBILE_DEVICE_WITHOUT_TEL_SUPPORT) {
                        if (agentString.contains(mobileWithoutTelSnippet)) {
                            isPhone = false;
                        }
                    }
                }
            }

            // Tablets
            for (String tabletDeviceSnippet : UA_TABLET_DEVICE_SNIPPETS) {
                if (agentString.contains(tabletDeviceSnippet)) {
                    isTablet = true;
                }
            }
        }

        if (!matchFound) {
            if (!isTablet && agentString.contains("android")) { // Android
                matchFound = true;
                uaType = "desktop";
                isPhone = true;

            } else if (agentString.contains("pre/")) { // Palm Pre
                matchFound = true;
                uaType = "desktop";
                isPhone = true;

            } else if (agentString.contains("kindle/")) { // Amazon Kindle
                matchFound = true;
                uaType = "ereader";
                isPhone = false;

            } else { // Bots
                for (String botSnippet : UA_BOT_SNIPPETS) {
                    if (agentString.contains(botSnippet)) {
                        matchFound = true;
                        uaType = "bot";
                        isPhone = false;
                    }
                }
            }
        }

        // Categorize Device
        if (isPhone) {
            ua.addName("Device-Phone");
        } else {
            ua.addName("Device-NoPhone");
        }

        if ("ereader".equals(uaType)) {
            ua.addName("Device-Mobile");
            ua.addName("Device-Ereader");
        } else if ("mobile".equals(uaType) || appleTouch || android || agentString.contains("webos/")) {
            ua.addName("Device-Mobile");
        } else if ("bot".equals(uaType)) {
            ua.addName("Device-Bot");
        } else if (!isTablet) {
            ua.addName("Device-Desktop");
        }

        if (isTablet) {
            ua.addName("Device-Tablet");
        }

        if (psp) {
            ua.addName("Device-Gaming");
            ua.addName("Device-Mobile");
            ua.addName("Device-PSP");
            if (agentString.contains("vita")) {
                analyze(ua, agentString, "Device-PSP-Vita", "vita ", 2, false);
            }
        }

        if (kindleFire) {
            ua.addName("Device-AmazonKindle");
            ua.addName("Device-AmazonKindle-Fire");

            if (agentString.contains("silk-accelerated=true")) {
                ua.addName("CloudAcceleration-Yes");
            } else if (agentString.contains("silk-accelerated=false")) {
                ua.addName("CloudAcceleration-No");
            }
        }

        if (appleTouch) {
            ua.addName("Device-AppleTouch");
            if (agentString.contains("ipod")) {
                ua.addName("Device-AppleTouch-iPod");
            } else if (agentString.contains("ipad")) {
                ua.addName("Device-AppleTouch-iPad");
            } else {
                ua.addName("Device-AppleTouch-iPhone");
            }
        } else if (agentString.contains("blackberry")) {
            analyze(ua, agentString, "Device-Blackberry", "blackberry", 1, false);
            analyze(ua, agentString, "Device-Blackberry", "blackberry ", 1, false);
        } else if (agentString.contains("kindle/")) {
            analyze(ua, agentString, "Device-AmazonKindle", "kindle/", 2, false);
        }

        // Detect OS, browser engine and browser
        if (!"bot".equals(uaType)) {
            detectBrowserOS(ua);
            detectBrowserEngine(ua);
            detectBrowser(ua);
        }

        if (ua.hasName("BrowserEngine-Trident") && !ua.hasName("Browser-MobileMSIE")) {
            analyze(ua, agentString, "BrowserEngine-Trident-MSIE", agentString.contains("msie ") ? "msie " : "(ie ", 2, true);
        }
    }

    private static final void detectBrowserOS(UserAgent ua) {

        String agentString = ua.getLowerCaseAgentString();

        boolean nook = agentString.contains("nook ") || agentString.contains("nook/") || agentString.contains("bntv250");

        // Maemo - check before Linux
        if (agentString.contains("maemo")) {
            ua.addName("BrowserOS-NIX");
            ua.addName("BrowserOS-Linux");
            ua.addName("BrowserOS-Linux-Maemo");
        }

        // Linux
        if (agentString.contains("linux") || agentString.contains("android") || nook) {
            ua.addName("BrowserOS-NIX");
            ua.addName("BrowserOS-Linux");
            if (agentString.contains("linux 2.")) {
                analyze(ua, agentString, "BrowserOS-Linux", "linux ");
            }

            // Android
            if (agentString.contains("android") || nook) {
                analyze(ua, agentString, "BrowserOS-Linux-Android", "android ");
            }

            // Google Chrome OS
        } else if (agentString.contains("cros ")) {
            ua.addName("BrowserOS-CrOS");

            // webOS, by Palm
        } else if (agentString.contains("webos/")) {
            analyze(ua, agentString, "BrowserOS-WebOS", "webos/");

            // iOS (detect before Mac OS)
        } else if (agentString.contains("iphone") || agentString.contains("ipod") || agentString.contains("ipad")) {
            analyze(ua, agentString.replace('_', '.').replace("mac os x", ""), "BrowserOS-iOS", "OS ");

            // Mac OS
        } else if (agentString.contains("mac os") || agentString.contains("mac_") || agentString.contains("macintosh")) {
            ua.addName("BrowserOS-MacOS");

            // OS X
            if (agentString.contains("mac os x")) {
                ua.addName("BrowserOS-NIX");
                ua.addName("BrowserOS-MacOS-10");
                analyze(ua, agentString.replace('_', '.'), "BrowserOS-MacOS", "mac os x ", 0, false);
                analyze(ua, agentString.replace('_', '.'), "BrowserOS-MacOS", "mac os x tiger ", 0, false);
                analyze(ua, agentString.replace('_', '.'), "BrowserOS-MacOS", "mac os x leopard ", 0, false);
                analyze(ua, agentString.replace('_', '.'), "BrowserOS-MacOS", "mac os x snow leopard ", 0, false);
                analyze(ua, agentString.replace('_', '.'), "BrowserOS-MacOS", "mac os x lion ", 0, false);
                analyze(ua, agentString.replace('_', '.'), "BrowserOS-MacOS", "mac os x mountain lion ", 0, false);
            }

            // Windows
        } else if (agentString.contains("windows") || agentString.contains("win3.") || agentString.contains("win9") || agentString.contains("winnt") || agentString.contains("wince")) {
            ua.addName("BrowserOS-Windows");
            if (agentString.contains("windows nt")) {
                analyze(ua, agentString, "BrowserOS-Windows-NT", "windows nt ", 2, true);
            } else if (agentString.contains("windows 5.") || agentString.contains("windows 6.")) {
                analyze(ua, agentString, "BrowserOS-Windows-NT", "windows ", 2, false);
            } else if (agentString.contains("windows vista")) {
                analyze(ua, "nt/6.0", "BrowserOS-Windows-NT", "nt/", 2, false);
            } else if (agentString.contains("windows xp")) {
                analyze(ua, "nt/5.1", "BrowserOS-Windows-NT", "nt/", 2, false);
            } else if (agentString.contains("windows 2000")) {
                analyze(ua, "nt/5.0", "BrowserOS-Windows-NT", "nt/", 2, false);
            } else if (agentString.contains("winnt")) {
                analyze(ua, agentString, "BrowserOS-Windows-NT", "winnt", 2, true);

                // Windows ME (needs to be checked before Windows 98)
            } else if (agentString.contains("win 9x 4.90") || agentString.contains("windows me")) {
                ua.addName("BrowserOS-Windows-ME");

                // Windows 98
            } else if (agentString.contains("windows 98") || agentString.contains("win98")) {
                ua.addName("BrowserOS-Windows-98");

                // Windows 95
            } else if (agentString.contains("windows 95") || agentString.contains("win95")) {
                ua.addName("BrowserOS-Windows-95");
                
                // Windows Phone
            } else if (agentString.contains("windows phone os")) {
                analyze(ua, agentString, "BrowserOS-Windows-Phone", "windows phone os", 2, false);
            } else if (agentString.contains("windows phone")) {
                analyze(ua, agentString, "BrowserOS-Windows-Phone", "windows phone", 2, false);

                // Windows Mobile
            } else if (agentString.contains("windows mobile") || agentString.contains("windows; ppc") || agentString.contains("windows ce") || agentString.contains("wince")) {
                analyze(ua, agentString, "BrowserOS-Windows-Mobile", "windows mobile ", 3, true);

                // Windows 3.x
            } else if (agentString.contains("windows 3.")) {
                analyze(ua, agentString, "BrowserOS-Windows", "windows ", 3, true);
            } else if (agentString.contains("win3.")) {
                int indexWin3 = agentString.indexOf("win3.");
                int indexWindows = agentString.indexOf("windows");
                String s = indexWindows >= 0 && indexWindows < indexWin3 ? agentString.substring(indexWindows + 1) : agentString;

                analyze(ua, s, "BrowserOS-Windows", "win", 3, true);
            }

            // Add some marketing names for various Windows versions
            if (ua.hasName("BrowserOS-Windows-NT-5-0")) {
                ua.addName("BrowserOS-Windows-2000");
            } else if (ua.hasName("BrowserOS-Windows-NT-5")) {
                ua.addName("BrowserOS-Windows-XP");
            } else if (ua.hasName("BrowserOS-Windows-NT-6-0")) {
                ua.addName("BrowserOS-Windows-Vista");
            } else if (ua.hasName("BrowserOS-Windows-NT-6-1")) {
                ua.addName("BrowserOS-Windows-7");
            } else if (ua.hasName("BrowserOS-Windows-NT-6-2")) {
            	if (agentString.contains(" arm;")) {
            		ua.addName("BrowserOS-Windows-RT");
            	} else {
                    ua.addName("BrowserOS-Windows-8");
                    ua.addName("BrowserOS-Windows-8-0");
            	}
            } else if (ua.hasName("BrowserOS-Windows-NT-6-3")) {
            	if (agentString.contains(" arm;")) {
            		ua.addName("BrowserOS-Windows-RT");
            	} else {
                    ua.addName("BrowserOS-Windows-8");
                    ua.addName("BrowserOS-Windows-8-1");
            	}
            }

            // DragonFlyBSD, extra check
        } else if (agentString.contains("dragonfly")) {
            ua.addName("BrowserOS-NIX");
            ua.addName("BrowserOS-BSD");
            ua.addName("BrowserOS-BSD-DragonFlyBSD");

            // Other BSD variants
        } else if (agentString.contains("bsd")) {
            ua.addName("BrowserOS-NIX");
            ua.addName("BrowserOS-BSD");
            if (agentString.contains("netbsd")) {
                ua.addName("BrowserOS-BSD-NetBSD");
            } else if (agentString.contains("openbsd")) {
                ua.addName("BrowserOS-BSD-OpenBSD");
            } else if (agentString.contains("freebsd")) {
                ua.addName("BrowserOS-BSD-FreeBSD");
            }

            // AIX
        } else if (agentString.contains("aix")) {
            ua.addName("BrowserOS-NIX");
            analyze(ua, agentString, "BrowserOS-AIX", "aix ", 1, false);

            // IRIX
        } else if (agentString.contains("irix")) {
            ua.addName("BrowserOS-NIX");
            analyze(ua, agentString, "BrowserOS-IRIX", "irix ", 2, false);
            analyze(ua, agentString, "BrowserOS-IRIX", "irix64 ", 2, false);

            // HP-UX
        } else if (agentString.contains("hp-ux")) {
            ua.addName("BrowserOS-NIX");
            ua.addName("BrowserOS-HPUX");

            // Sun Solaris
        } else if (agentString.contains("sunos")) {
            ua.addName("BrowserOS-NIX");
            analyze(ua, agentString, "BrowserOS-Solaris", "sunos ", 1, false);

            // Sun Solaris
        } else if (agentString.contains("beos")) {
            ua.addName("BrowserOS-BeOS");

            // OS/2 (a.k.a. Ecomstation)
        } else if (agentString.contains("(os/2")) {
            analyze(ua, agentString, "BrowserOS-OS2", "warp ", 1, false);

            // Symbian
        } else if (agentString.contains("symbian")) {
            analyze(ua, agentString, "BrowserOS-Symbian", "symbianos/", 3, false);

        } else if (agentString.contains("bada/")) {
            analyze(ua, agentString, "BrowserOS-Bada", "bada/", 2, false);
        }
    }

    private static final void detectBrowserEngine(UserAgent ua) {
        String agentString = ua.getLowerCaseAgentString();

        // Apple WebKit
        if (agentString.contains("applewebkit/")) {
            analyze(ua, agentString, "BrowserEngine-WebKit", "applewebkit/", 4, false);
        } else if (agentString.contains("apple webkit/")) {
            analyze(ua, agentString, "BrowserEngine-WebKit", "apple webkit/", 4, false);

            // Mozilla Gecko
        } else if (agentString.contains("gecko/")) {
            analyze(ua, agentString, "BrowserEngine-Gecko", "rv:", 4, false);

            // Opera Presto
        } else if (agentString.contains("presto/")) {
            analyze(ua, agentString, "BrowserEngine-Presto", "presto/", 3, false);
        } else if (agentString.contains("presto")) {
            analyze(ua, agentString, "BrowserEngine-Presto", "presto ", 3, false);

            // Microsoft Trident
        } else if (agentString.contains("trident/")) {
            analyze(ua, agentString, "BrowserEngine-Trident", "trident/", 3, false);
        } else if (agentString.contains("trident")) {
            analyze(ua, agentString, "BrowserEngine-Trident", "trident ", 3, false);

            // KDE KHTML
        } else if (agentString.contains("khtml/")) {
            analyze(ua, agentString, "BrowserEngine-KHTML", "khtml/", 3, false);
        } else {
            if (agentString.contains("opera ")) {
                ua.addName("BrowserEngine-Presto");
            } else if (agentString.contains("msie ") || agentString.contains("msie/")) {
                if (agentString.contains("mac") && agentString.contains("msie 5.")) {
                    ua.addName("BrowserEngine-Tasman");
                } else {
                    ua.addName("BrowserEngine-Trident");
                }
            }
        }
    }

    private static final void detectBrowser(UserAgent ua) {

        String agentString = ua.getLowerCaseAgentString();

        // Lunascape, can use different rendering engines
        // E.g.: Lunascape5 (Webkit) - Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US)
        // AppleWebKit/528+ (KHTML, like Gecko, Safari/528.0) Lunascape/5.0.3.0
        if (agentString.contains("lunascape")) {
            analyze(ua, agentString, "Browser-Lunascape", "lunascape ", 4, false);
            analyze(ua, agentString, "Browser-Lunascape", "lunascape/", 4, false);

            // Maxthon
        } else if (agentString.contains("maxthon")) {
            analyze(ua, agentString, "Browser-Maxthon", "maxthon ", 4, false);
            analyze(ua, agentString, "Browser-Maxthon", "maxthon/", 4, false);

            // Sleipnir
        } else if (agentString.contains("sleipnir/")) {
            analyze(ua, agentString, "Browser-Sleipnir", "sleipnir/", 3, false);

            // Blackberry
        } else if (agentString.contains("blackberry")) {
            analyze(ua, agentString, "Browser-Blackberry", "version/");

            // Konqueror (needs to be detected before Gecko-based browsers)
            // E.g.: Mozilla/5.0 (compatible; Konqueror/4.1; Linux) KHTML/4.1.2 (like Gecko)
        } else if (agentString.contains("konqueror")) {
            analyze(ua, agentString, "Browser-Konqueror", "konqueror/", 2, false);
            ua.addName("BrowserEngine-KHTML");

            // Fennec
            // E.g.: Mozilla/5.0 (Macintosh; U; Intel Mac OS X; en-US; rv:1.9.2a1pre) Gecko/20090317
            // Fennec/1.0b1
            // Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1b2pre) Gecko/20081015 Fennec/1.0a1
            // Mozilla/5.0 (X11; U; Linux armv7l; en-US; rv:1.9.2a1pre) Gecko/20090322
            // Fennec/1.0b2pre
        } else if (agentString.contains("fennec")) {
            analyze(ua, agentString, "Browser-Fennec", "fennec/");
            analyze(ua, agentString, "Browser-MobileFirefox", "fennec/");

            // Epiphany
            // E.g.: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.3) Gecko/20041007 Epiphany/1.4.7
        } else if (agentString.contains("epiphany")) {
            analyze(ua, agentString, "Browser-Epiphany", "epiphany/");

            // Flock (needs to be detected before Firefox and Chrome)
            // E.g.: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.18) Gecko/20081107
            // Firefox/2.0.0.18 Flock/1.2.7
            // or: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/534.7 (KHTML, like
            // Gecko) Flock/3.5.2.4599 Chrome/7.0.517.442 Safari/534.7
        } else if (agentString.contains("flock")) {
            analyze(ua, agentString, "Browser-Flock", "flock/", 4, false);

            // Camino (needs to be detected before Firefox)
            // E.g.: Mozilla/5.0 (Macintosh; U; Intel Mac OS X; nl; rv:1.8.1.14) Gecko/20080512
            // Camino/1.6.1 (MultiLang) (like Firefox/2.0.0.14)
        } else if (agentString.contains("camino")) {
            analyze(ua, agentString, "Browser-Camino", "camino/");

            // SeaMonkey
            // E.g.: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1b3pre) Gecko/20090302
            // SeaMonkey/2.0b1pre
        } else if (agentString.contains("seamonkey/")) {
            analyze(ua, agentString, "Browser-SeaMonkey", "seamonkey/");

            // SeaMonkey (again)
            // E.g.: Seamonkey-1.1.13-1(X11; U; GNU Fedora fc 10) Gecko/20081112
        } else if (agentString.contains("seamonkey-")) {
            analyze(ua, agentString, "Browser-SeaMonkey", "seamonkey-");
            ua.addName("BrowserEngine-Gecko");

            // Netscape Navigator (needs to be detected before Firefox)
            // E.g.: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.5pre) Gecko/20070712
            // Firefox/2.0.0.4 Navigator/9.0b2
        } else if (agentString.contains("navigator/")) {
            analyze(ua, agentString, "Browser-Netscape", "navigator/");
            ua.addName("BrowserEngine-Gecko");

            // Firefox
        } else if (agentString.contains("firefox")) {
            analyze(ua, agentString, "Browser-Firefox", "firefox/");
            if (agentString.contains("mobile") || agentString.contains("tablet")) {
                analyze(ua, agentString, "Browser-MobileFirefox", "firefox/");
            }
        } else if (agentString.contains("minefield/")) {
            analyze(ua, agentString, "Browser-Firefox", "minefield/");

        } else if (agentString.contains("namoroka/")) {
            analyze(ua, agentString, "Browser-Firefox", "namoroka/"); // Firefox 3.6 pre-releases
        } else if (agentString.contains("shiretoko/")) {
            analyze(ua, agentString, "Browser-Firefox", "shiretoko/"); // Firefox 3.5 pre-releases
        } else if (agentString.contains("granparadiso/")) {
            analyze(ua, agentString, "Browser-Firefox", "granparadiso/"); // Firefox 3.0/3.1
                                                                          // pre-releases
        } else if (agentString.contains("firebird/")) {
            analyze(ua, agentString, "Browser-Firefox", "firebird/"); // Before 1.0
        } else if (agentString.contains("phoenix/")) {
            analyze(ua, agentString, "Browser-Firefox", "phoenix/"); // Before 1.0 (and before
                                                                     // Firebird code-name)

            // Opera (detect before Chrome)
        } else if (agentString.startsWith("opera/") || agentString.contains("opr/")) {

            ua.addName("Browser-Opera");

            String browserName;
            if (agentString.contains("tablet")) { // Opera Tablet
                browserName = "Browser-OperaTablet";
            } else if (agentString.contains("mini/")) { // Opera Mini
                browserName = "Browser-OperaMini";
            } else if (agentString.contains("mobi/")) { // Opera Mobile
                browserName = "Browser-OperaMobile";
            } else { // Opera Desktop
                browserName = "Browser-OperaDesktop";
            }

            if (agentString.contains("opera mini/")) {
                analyze(ua, agentString, browserName, "opera mini/", 3, true);
            } else if (agentString.contains("opr/")) {
                analyze(ua, agentString, browserName, "opr/", 4, true);
            } else if (agentString.contains("version/")) {
                analyze(ua, agentString, browserName, "version/", 3, true);
            } else if (agentString.contains("opera/")) {
                ua.addName("BrowserEngine-Presto");
                analyze(ua, agentString, browserName, "opera/", 3, true);
            } else {
                analyze(ua, agentString, "Browser-OperaDesktop", agentString.contains("version/") ? "version/" : "opera/", 3, true);
            }

            // Opera (older releases)
        } else if (agentString.contains("opera")) {
            ua.addName("Browser-Opera");
            analyze(ua, agentString, "Browser-OperaDesktop", "opera ", 3, true);
            ua.addName("BrowserEngine-Presto");

            // Palm Pre browser - this one needs to be checked before Safari
        } else if (agentString.contains("pre/")) {
            analyze(ua, agentString, "Browser-PalmPreBrowser", "version/");

            // OmniWeb - this one needs to be checked before Safari
        } else if (agentString.contains("omniweb")) {
            ua.addName("Browser-OmniWeb");

            // RockMelt - this one needs to be checked before Google Chrome
            // e.g.: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/534.13 (KHTML, like
            // Gecko) RockMelt/0.9.48.51 Chrome/9.0.597.107 Safari/534.13
        } else if (agentString.contains("rockmelt")) {
            analyze(ua, agentString, "Browser-RockMelt", "rockmelt/", 4, false);

            // Google Chrome - this one needs to be checked before Safari
            // e.g.: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US) AppleWebKit/525.13 (KHTML, like
            // Gecko) Chrome/0.X.Y.Z Safari/525.13.
        } else if (agentString.contains("chrome/") && !agentString.contains("chromeframe")) {
            analyze(ua, agentString, "Browser-Chrome", "chrome/", 4, false);

            // Nokia browser - needs to be checked before Safari
        } else if (agentString.contains("symbianos")) {
            if (agentString.contains("version/") || !agentString.contains("browserng/")) {
                analyze(ua, agentString, "Browser-Nokia", "version/", 3, false);
            } else {
                analyze(ua, agentString, "Browser-Nokia", "browserng/", 3, false);
            }

            // NetFront
        } else if (agentString.contains("netfront")) {
            analyze(ua, agentString, "Browser-NetFront", "netfront/", 3, true);

            // Amazon Kindle browser (detect after NetFront but before Safari)
        } else if (agentString.contains("kindle/")) {
            analyze(ua, agentString, "Browser-Kindle", "version/", 2, true);

            // Dolphin, check before Safari
        } else if (agentString.contains("dolfin")) {
            analyze(ua, agentString, "Browser-Dolphin", "dolfin/", 2, true);

            // Nook, check before Safari
        } else if (agentString.contains("nook ") || agentString.contains("bntv250 ")) {
            if (agentString.contains("nook browser/")) {
                analyze(ua, agentString, "Browser-Nook", "browser/", 2, true);
            } else {
                analyze(ua, agentString, "Browser-Nook", "version/", 2, true);
            }

        } else if (agentString.contains("silk/")) {
            analyze(ua, agentString, "Browser-Silk", "silk/", 2, true);

            // iCab, check before Safari
            // E.g.: iCab/4.5 (Macintosh; U; Mac OS X Leopard 10.5.7)
        } else if (agentString.contains("icab")) {
            analyze(ua, agentString, "Browser-iCab", "icab/");
            analyze(ua, agentString, "Browser-iCab", "icab ");

            // iCab 4 uses the WebKit rendering engine, although the user agent
            // string does not advertise that
            if (ua.hasName("Browser-iCab-4")) {
                ua.addName("BrowserEngine-WebKit");
            }

            // Apple Safari
        } else if (! agentString.contains("chromeframe") && (agentString.contains("safari") || agentString.contains("applewebkit"))) {
            ua.addName("BrowserEngine-WebKit");
            ua.addName("Browser-Safari");

            if (agentString.contains("mobile/") || agentString.contains("android")) {
                if (Pattern.compile("mobile\\/[0-9]+(\\.[0-9]+)+(\\s|\\))").matcher(agentString).find()) {
                    analyze(ua, agentString, "Browser-MobileSafari", "mobile/");
                } else {
                    analyze(ua, agentString, "Browser-MobileSafari", "version/");
                }
            } else {
                analyze(ua, agentString, "Browser-DesktopSafari", "version/");
            }

            // Netscape (again)
        } else if (agentString.contains("netscape6")) {
            analyze(ua, agentString, "Browser-Netscape", "netscape6/");
            ua.addName("Browser-Netscape");
            ua.addName("Browser-Netscape-6");
            ua.addName("BrowserEngine-Gecko");
        } else if (agentString.contains("netscape")) {
            analyze(ua, agentString, "Browser-Netscape", "netscape/", 3, true);
            ua.addName("BrowserEngine-Gecko");

            // Internet Explorer
        } else if (agentString.contains("msie") || agentString.contains("(ie ") || agentString.contains("chromeframe")) {
            ua.addName("Browser-MSIE");

            // Mobile IE
            if (agentString.contains("iemobile/")) {
                analyze(ua, agentString, "Browser-MobileMSIE", "iemobile/", 3, true);
            } else if (agentString.contains("iemobile")) {
                analyze(ua, agentString, "Browser-MobileMSIE", "iemobile ", 3, true);
            } else if (ua.hasName("BrowserOS-Windows-Mobile")) {
                ua.addName("Browser-MobileMSIE");
            } else {
                analyze(ua, agentString, "Browser-DesktopMSIE", agentString.contains("msie ") ? "msie " : "(ie ", 3, true);

                // Chrome Frame
                if (agentString.contains("chromeframe")) {
                    analyze(ua, agentString, "BrowserEngine-ChromeFrame", "chromeframe/", 4, false);
                }
            }

            // NCSA Mosaic
        } else if (agentString.startsWith("ncsa_mosaic") || agentString.startsWith("ncsa mosaic")) {
            analyze(ua, agentString.replace('_', ' '), "Browser-Mosaic", "ncsa mosaic/", 2, true);

            // Netscape 1, 2, 3, 4
        } else if (!agentString.contains("(compatible") && TextUtils.matches(agentString, "mozilla\\/[1234]")) {
            analyze(ua, agentString, "Browser-Netscape", "mozilla/", 3, true);
            
            // Internet Explorer, as of version 11
        } else if (agentString.contains("trident/") && agentString.contains("rv")) {
        	ua.addName("Browser-MSIE");
                if (agentString.contains("rv ")) {
        	    analyze(ua, agentString, "Browser-DesktopMSIE", "rv ", 3, true);
        	    analyze(ua, agentString, "BrowserEngine-Trident-MSIE", "rv ", 2, true); // TODO: Move elsewhere
                } else if (agentString.contains("rv:")) {
        	    analyze(ua, agentString, "Browser-DesktopMSIE", "rv:", 3, true);
        	    analyze(ua, agentString, "BrowserEngine-Trident-MSIE", "rv:", 2, true); // TODO: Move elsewhere
                }

        }
    }

    private static final void analyze(UserAgent ua, String agentString, String basicName, String versionPrefix) {
        analyze(ua, agentString, basicName, versionPrefix, 3, false);
    }

    private static final void analyze(UserAgent ua, String agentString, String basicName, String versionPrefix, int minVersionParts, boolean splitSecondVersionPart) {

        versionPrefix = versionPrefix.toLowerCase();

        // First add the basic name
        ua.addName(basicName);

        // Find the location of the version number after the prefix
        int index = agentString.indexOf(versionPrefix);
        if (index >= 0) {

            // Get the version number in a string
            String version = cutVersionEnd(agentString.substring(index + versionPrefix.length()).trim());

            if (version.length() > 0 && !version.startsWith("00")) {

                // Split the version number in pieces
                String[] versionParts = version.split("\\.");

                // First version part can always be done immediately
                String specificName = basicName + '-' + versionParts[0];
                ua.addName(specificName);

                int versionPartsFound;
                if (splitSecondVersionPart && versionParts.length == 2) {
                    versionPartsFound = 1;

                    String secondVersionPart = versionParts[1];
                    for (int i = 0; i < secondVersionPart.length(); i++) {
                        specificName += "-" + secondVersionPart.charAt(i);
                        ua.addName(specificName);
                        versionPartsFound++;
                    }
                } else {
                    for (int i = 1; i < versionParts.length; i++) {
                        if (TextUtils.matches(versionParts[i], "^0[0-9]")) {
                            specificName += '-' + "0";
                            ua.addName(specificName);
                            versionParts[i] = versionParts[i].substring(1);
                        }

                        specificName += '-' + versionParts[i];
                        ua.addName(specificName);
                    }
                    versionPartsFound = versionParts.length;
                }

                for (int i = versionPartsFound; i < minVersionParts; i++) {
                    specificName += "-0";
                    ua.addName(specificName);
                }
            }
        }
    }

    private static final String cutVersionEnd(String s) {
        String result = "";
        for (int i = 0; i < s.length(); i++) {
            char c = s.charAt(i);
            if (Character.isDigit(c) || c == '.') {
                result += c;
            } else {
                break;
            }
        }

        return result;
    }
}