// This Source Code is in the Public Domain per: http://unlicense.org
package org.litesoft.GWT.client;

import org.litesoft.core.*;

import com.google.gwt.core.client.*;

public class UserAgent {
    private static UserAgent sInstance = null;

    public static UserAgent getInstance() {
        if ( sInstance == null ) {
            sInstance = (UserAgent) GWT.create( UserAgent.class );
        }
        return sInstance;
    }

    private final DeviceType mDeviceType;
    private final Platform mPlatform;
    private final BrowserFamily mFamily;
    private final String mReally;
    private final Integer mVersion;

    protected UserAgent( BrowserFamily pFamily, String pReally, Integer pVersion ) {
        String zLowercaseUserAgent = getBrowserUserAgent().toLowerCase();
        mDeviceType = DeviceType.fromUserAgent( zLowercaseUserAgent );
        mPlatform = Platform.fromUserAgent( mDeviceType, zLowercaseUserAgent );
        mFamily = pFamily;
        mReally = (pVersion == null) ? pReally : pReally + pVersion;
        mVersion = pVersion;
    }

    protected UserAgent( BrowserFamily pFamily, String pReally ) {
        this( pFamily, pReally, null );
    }

    protected UserAgent( BrowserFamily pFamily ) {
        this( pFamily, "" );
    }

    protected UserAgent() {
        this( BrowserFamily.Other );
    }

    public DeviceType getDeviceType() {
        return mDeviceType;
    }

    public Platform getPlatform() {
        return mPlatform;
    }

    public BrowserFamily getFamily() {
        return mFamily;
    }

    public String getReally() {
        return mReally;
    }

    public Integer getVersion() {
        return mVersion;
    }

    public boolean isLegacyIE() {
        return false;
    }

    public static native String getBrowserUserAgent() /*-{
        return navigator.userAgent;
    }-*/;

    @Override
    public String toString() {
        StringBuilder sb = new StringBuilder();
        sb.append( mDeviceType ).append( '-' ).append( mPlatform );
        sb.append( '-' ).append( mFamily ).append( '-' ).append( mReally );
        sb.append( " '" ).append( getBrowserUserAgent() ).append( "'" );
        return sb.toString();
    }
}