/*

 * Copyright (C) 2006 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 "WebArchiver.h"

#import "WebArchive.h"

#import "WebDOMOperationsPrivate.h"

#import "WebDataSource.h"

#import "WebDocument.h"

#import "WebFrame.h"

#import "WebFrameBridge.h"

#import "WebFrameInternal.h"

#import "WebResource.h"

#import <JavaScriptCore/Assertions.h>

#import <WebCore/Frame.h>

#import <WebCore/SelectionController.h>

#import <WebKit/DOM.h>

using namespace WebCore;

@implementation WebArchiver

+ (NSArray *)_subframeArchivesForFrame:(WebFrame *)frame

{

    NSEnumerator *enumerator = [[frame childFrames] objectEnumerator];

    NSMutableArray *subframeArchives = [NSMutableArray array];

    WebFrame *childFrame;

    while ((childFrame = [enumerator nextObject])) {

        WebArchive *childFrameArchive = [self archiveFrame:childFrame];

        if (childFrameArchive)

            [subframeArchives addObject:childFrameArchive];

    }

    return subframeArchives;

}

+ (WebArchive *)archiveFrame:(WebFrame *)frame;

{

    return [[[WebArchive alloc] initWithMainResource:[[frame _dataSource] mainResource]

                                        subresources:[[frame _dataSource] subresources]

                                    subframeArchives:[self _subframeArchivesForFrame:frame]] autorelease];

}

+ (WebArchive *)archiveMainResourceForFrame:(WebFrame *)frame;

{

    return [[[WebArchive alloc] initWithMainResource:[[frame _dataSource] mainResource]

                                        subresources:nil

                                    subframeArchives:nil] autorelease];

}

+ (WebArchive *)_archiveCurrentStateForFrame:(WebFrame *)frame

{

    if ([frame DOMDocument])

        return [self archiveNode:[frame DOMDocument]];

    return [self archiveFrame:frame];

}

+ (WebArchive *)_archiveWithMarkupString:(NSString *)markupString fromFrame:(WebFrame *)frame nodes:(NSArray *)nodes

{ 

    NSURLResponse *response = [[frame _dataSource] response];

    NSURL *responseURL = [response URL];

    // it's possible to have a response without a URL here

    // <rdar://problem/5454935>

    if (!responseURL)

        responseURL = [NSURL URLWithString:@""];

    WebResource *mainResource = [[WebResource alloc] initWithData:[markupString dataUsingEncoding:NSUTF8StringEncoding]

                                                              URL:responseURL

                                                         MIMEType:[response MIMEType]

                                                 textEncodingName:@"UTF-8"

                                                        frameName:[frame name]];

    NSMutableArray *subframeArchives = [[NSMutableArray alloc] init];

    NSMutableArray *subresources = [[NSMutableArray alloc] init];

    NSMutableSet *uniqueSubresources = [[NSMutableSet alloc] init];

    NSEnumerator *enumerator = [nodes objectEnumerator];

    DOMNode *node;

    while ((node = [enumerator nextObject]) != nil) {

        WebFrame *childFrame;

        if (([node isKindOfClass:[DOMHTMLFrameElement class]] || 

             [node isKindOfClass:[DOMHTMLIFrameElement class]] || 

             [node isKindOfClass:[DOMHTMLObjectElement class]]) &&

            ((childFrame = [(DOMHTMLFrameElement *)node contentFrame]) != nil)) {

            [subframeArchives addObject:[self _archiveCurrentStateForFrame:childFrame]];

        } else {

            NSEnumerator *enumerator = [[node _subresourceURLs] objectEnumerator];

            NSURL *URL;

            while ((URL = [enumerator nextObject]) != nil) {

                if ([uniqueSubresources containsObject:URL])

                    continue;

                [uniqueSubresources addObject:URL];

                WebResource *subresource = [[frame _dataSource] subresourceForURL:URL];

                if (subresource)

                    [subresources addObject:subresource];

                else

                    // FIXME: should do something better than spew to console here

                    LOG_ERROR("Failed to archive subresource for %@", URL);

            }

        }

    }

    WebArchive *archive = [[[WebArchive alloc] initWithMainResource:mainResource subresources:subresources subframeArchives:subframeArchives] autorelease];

    [mainResource release];

    [uniqueSubresources release];

    [subresources release];

    [subframeArchives release];

    return archive;

}

+ (WebArchive *)archiveRange:(DOMRange *)range

{

    WebFrameBridge *bridge = [range _bridge];

    WebFrame *frame = [bridge webFrame];

    NSArray *nodes;

    NSString *markupString = [bridge markupStringFromRange:range nodes:&nodes];

    return [self _archiveWithMarkupString:markupString fromFrame:frame nodes:nodes];

}

+ (WebArchive *)archiveNode:(DOMNode *)node

{

    WebFrame *frame = [[node ownerDocument] webFrame];

    WebFrameBridge *bridge = [frame _bridge];

    NSArray *nodes;

    NSString *markupString = [bridge markupStringFromNode:node nodes:&nodes];

    return [self _archiveWithMarkupString:markupString fromFrame:frame nodes:nodes];

}

+ (WebArchive *)archiveSelectionInFrame:(WebFrame *)frame

{

    Frame* coreFrame = core(frame);

    if (!coreFrame)

        return nil;

    WebFrameBridge *bridge = [frame _bridge];

    NSArray *nodes;

    NSString *markupString = [bridge markupStringFromRange:kit(coreFrame->selectionController()->toRange().get()) nodes:&nodes];

    WebArchive *archive = [self _archiveWithMarkupString:markupString fromFrame:frame nodes:nodes];

    if (coreFrame->isFrameSet()) {

        // Wrap the frameset document in an iframe so it can be pasted into

        // another document (which will have a body or frameset of its own). 

        NSString *iframeMarkup = [[NSString alloc] initWithFormat:@"<iframe frameborder=\"no\" marginwidth=\"0\" marginheight=\"0\" width=\"98%%\" height=\"98%%\" src=\"%@\"></iframe>", [[[frame _dataSource] response] URL]];

        WebResource *iframeResource = [[WebResource alloc] initWithData:[iframeMarkup dataUsingEncoding:NSUTF8StringEncoding]

                                                                  URL:[NSURL URLWithString:@"about:blank"]

                                                             MIMEType:@"text/html"

                                                     textEncodingName:@"UTF-8"

                                                            frameName:nil];

        NSArray *subframeArchives = [NSArray arrayWithObject:archive];

        archive = [[[WebArchive alloc] initWithMainResource:iframeResource subresources:nil subframeArchives:subframeArchives] autorelease];

        [iframeResource release];

        [iframeMarkup release];

    }

    return archive;

}

@end