/*

 * Copyright (C) 2005, 2008 Apple Inc. All rights reserved.

 * Copyright (C) 2006 Alexey Proskuryakov (ap@nypop.com)

 *

 * 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 "config.h"

#import "LoaderNSURLExtras.h"

#import <wtf/Assertions.h>

#import <wtf/Vector.h>

#import "KURL.h"

#import "LocalizedStrings.h"

#import "MIMETypeRegistry.h"

#import "PlatformString.h"

#import "WebCoreNSStringExtras.h"

using namespace WebCore;

static bool vectorContainsString(const Vector<String>& vector, const String& string)

{

    int size = vector.size();

    for (int i = 0; i < size; i++)

        if (vector[i] == string)

            return true;

    return false;

}

NSString *suggestedFilenameWithMIMEType(NSURL *url, NSString *MIMEType)

{

    // Get the filename from the URL. Try the lastPathComponent first.

    NSString *lastPathComponent = [[url path] lastPathComponent];

    NSString *filename = filenameByFixingIllegalCharacters(lastPathComponent);

    NSString *extension = nil;

    if ([filename length] == 0 || [lastPathComponent isEqualToString:@"/"]) {

        // lastPathComponent is no good, try the host.

        NSString *host = KURL(url).host();

        filename = filenameByFixingIllegalCharacters(host);

        if ([filename length] == 0) {

            // Can't make a filename using this URL, use "unknown".

            filename = copyImageUnknownFileLabel();

        }

    } else {

        // Save the extension for later correction. Only correct the extension of the lastPathComponent.

        // For example, if the filename ends up being the host, we wouldn't want to correct ".com" in "www.apple.com".

        extension = [filename pathExtension];

    }

    // No mime type reported. Just return the filename we have now.

    if (!MIMEType) {

        return filename;

    }

    // Do not correct filenames that are reported with a mime type of tar, and 

    // have a filename which has .tar in it or ends in .tgz

    if (([MIMEType isEqualToString:@"application/tar"] || [MIMEType isEqualToString:@"application/x-tar"]) 

        && (hasCaseInsensitiveSubstring(filename, @".tar")

        || hasCaseInsensitiveSuffix(filename, @".tgz"))) {

        return filename;

    }

    // I don't think we need to worry about this for the image case

    // If the type is known, check the extension and correct it if necessary.

    if (![MIMEType isEqualToString:@"application/octet-stream"] && ![MIMEType isEqualToString:@"text/plain"]) {

        Vector<String> extensions = MIMETypeRegistry::getExtensionsForMIMEType(MIMEType);

        if (extensions.isEmpty() || !vectorContainsString(extensions, extension)) {

            // The extension doesn't match the MIME type. Correct this.

            NSString *correctExtension = MIMETypeRegistry::getPreferredExtensionForMIMEType(MIMEType);

            if ([correctExtension length] != 0) {

                // Append the correct extension.

                filename = [filename stringByAppendingPathExtension:correctExtension];

            }

        }

    }

    return filename;

}