/*

 * Copyright (C) 2005 Apple Computer, Inc.  All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 *

 * 1.  Redistributions of source code must retain the above copyright

 *     notice, this list of conditions and the following disclaimer. 

 * 2.  Redistributions in binary form must reproduce the above copyright

 *     notice, this list of conditions and the following disclaimer in the

 *     documentation and/or other materials provided with the distribution. 

 * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of

 *     its contributors may be used to endorse or promote products derived

 *     from this software without specific prior written permission. 

 *

 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY

 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE

 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY

 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES

 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;

 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND

 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF

 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

#import <WebKit/WebNSUserDefaultsExtras.h>

#import <JavaScriptCore/Assertions.h>

#import <WebKitSystemInterface.h>

@implementation NSString (WebNSUserDefaultsPrivate)

- (NSString *)_webkit_HTTPStyleLanguageCode

{

    // Look up the language code using CFBundle.

    NSString *languageCode = self;

    NSString *preferredLanguageCode = [(id)WKCopyCFLocalizationPreferredName((CFStringRef)self) autorelease];

    if (preferredLanguageCode)

        languageCode = preferredLanguageCode;

    // Make the string lowercase.

    NSString *lowercaseLanguageCode = [languageCode lowercaseString];

    // Turn a '_' into a '-' if it appears after a 2-letter language code.

    if ([lowercaseLanguageCode length] < 3 || [lowercaseLanguageCode characterAtIndex:2] != '_') {

        return lowercaseLanguageCode;

    }

    NSMutableString *result = [lowercaseLanguageCode mutableCopy];

    [result replaceCharactersInRange:NSMakeRange(2, 1) withString:@"-"];

    return [result autorelease];

}

@end

@implementation NSUserDefaults (WebNSUserDefaultsExtras)

static NSString *preferredLanguageCode = nil;

static NSLock *preferredLanguageLock = nil;

static pthread_once_t preferredLanguageLockOnce = PTHREAD_ONCE_INIT;

static pthread_once_t addDefaultsChangeObserverOnce = PTHREAD_ONCE_INIT;

static void makeLock(void)

{

    preferredLanguageLock = [[NSLock alloc] init]; 

}

+ (void)_webkit_ensureAndLockPreferredLanguageLock

{

    pthread_once(&preferredLanguageLockOnce, makeLock);

    [preferredLanguageLock lock];

}

+ (void)_webkit_defaultsDidChange

{

    [self _webkit_ensureAndLockPreferredLanguageLock];

    [preferredLanguageCode release];

    preferredLanguageCode = nil;

    [preferredLanguageLock unlock];

}

static void addDefaultsChangeObserver(void)

{

    [[NSNotificationCenter defaultCenter] addObserver:[NSUserDefaults class]

                                             selector:@selector(_webkit_defaultsDidChange)

                                                 name:NSUserDefaultsDidChangeNotification

                                               object:[NSUserDefaults standardUserDefaults]];

}

+ (void)_webkit_addDefaultsChangeObserver

{

    pthread_once(&addDefaultsChangeObserverOnce, addDefaultsChangeObserver);

}

+ (NSString *)_webkit_preferredLanguageCode

{

    // Get this outside the lock since it might block on the defaults lock, while we are inside registerDefaults:.

    NSUserDefaults *standardDefaults = [self standardUserDefaults];

    BOOL addObserver = NO;

    [self _webkit_ensureAndLockPreferredLanguageLock];

    if (!preferredLanguageCode) {

        NSArray *languages = [standardDefaults stringArrayForKey:@"AppleLanguages"];

        if ([languages count] == 0) {

            preferredLanguageCode = [@"en" retain];

        } else {

            preferredLanguageCode = [[[languages objectAtIndex:0] _webkit_HTTPStyleLanguageCode] copy];

        }

        addObserver = YES;

    }

    NSString *code = [[preferredLanguageCode retain] autorelease];

    [preferredLanguageLock unlock];

    if (addObserver) {

        [self _webkit_addDefaultsChangeObserver];

    }

    return code;

}

@end