/*
 * Copyright (C) 2005-2017 Apple 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 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 <WebKitLegacy/WebNSFileManagerExtras.h>

#import "WebKitNSStringExtras.h"
#import "WebNSURLExtras.h"
#import <WebCore/LoaderNSURLExtras.h>
#import <sys/stat.h>
#import <wtf/Assertions.h>
#import <wtf/FileSystem.h>
#import <wtf/ObjCRuntimeExtras.h>

@implementation NSFileManager (WebNSFileManagerExtras)

#if !PLATFORM(IOS_FAMILY)

- (void)_webkit_setMetadataURL:(NSString *)URLString referrer:(NSString *)referrer atPath:(NSString *)path
{
    ASSERT(URLString);
    ASSERT(path);
    FileSystem::setMetadataURL(path, URLString, referrer);
}

#endif // !PLATFORM(IOS_FAMILY)

// -[NSFileManager fileExistsAtPath:] returns NO if there is a broken symlink at the path.
// So we use this function instead, which returns YES if there is anything there, including
// a broken symlink.
static BOOL fileExists(NSString *path)
{
    struct stat statBuffer;
    return !lstat([path fileSystemRepresentation], &statBuffer);
}

- (NSString *)_webkit_pathWithUniqueFilenameForPath:(NSString *)path
{
    // "Fix" the filename of the path.
    NSString *filename = filenameByFixingIllegalCharacters([path lastPathComponent]);
    path = [[path stringByDeletingLastPathComponent] stringByAppendingPathComponent:filename];

    if (fileExists(path)) {
        // Don't overwrite existing file by appending "-n", "-n.ext" or "-n.ext.ext" to the filename.
        NSString *extensions = nil;
        NSString *pathWithoutExtensions;
        NSString *lastPathComponent = [path lastPathComponent];
        NSRange periodRange = [lastPathComponent rangeOfString:@"."];
        
        if (periodRange.location == NSNotFound) {
            pathWithoutExtensions = path;
        } else {
            extensions = [lastPathComponent substringFromIndex:periodRange.location + 1];
            lastPathComponent = [lastPathComponent substringToIndex:periodRange.location];
            pathWithoutExtensions = [[path stringByDeletingLastPathComponent] stringByAppendingPathComponent:lastPathComponent];
        }

        for (unsigned i = 1; ; i++) {
            NSString *pathWithAppendedNumber = [NSString stringWithFormat:@"%@-%d", pathWithoutExtensions, i];
            path = [extensions length] ? [pathWithAppendedNumber stringByAppendingPathExtension:extensions] : pathWithAppendedNumber;
            if (!fileExists(path))
                break;
        }
    }

    return path;
}

#if PLATFORM(IOS_FAMILY)
- (NSString *)_webkit_createTemporaryDirectoryWithTemplatePrefix:(NSString *)prefix
{
    return FileSystem::createTemporaryDirectory(prefix);
}
#endif

@end