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//
// NotationFileManager.m
// Notation
//
// Created by Zachary Schneirov on 4/9/06.

/*Copyright (c) 2010, Zachary Schneirov. All rights reserved.
Redistribution and use in source and binary forms, with or without modification, are permitted
provided that the following conditions are met:
- Redistributions of source code must retain the above copyright notice, this list of conditions
and the following disclaimer.
- 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.
- Neither the name of Notational Velocity nor the names of its contributors may be used to endorse
or promote products derived from this software without specific prior written permission. */


#import "NotationFileManager.h"
#import "NotationPrefs.h"
#import "NSString_NV.h"
#import "NSFileManager_NV.h"
#import "NoteObject.h"
#import "GlobalPrefs.h"
#import "NSData_transformations.h"
#include <sys/param.h>
#include <sys/mount.h>

#import <Foundation/Foundation.h>
#include <openssl/md5.h>

NSString *NotesDatabaseFileName = @"Notes & Settings";

@implementation NotationController (NotationFileManager)

static BOOL VolumeSupportsExchangeObjects(NotationController *controller);
static struct statfs *StatFSVolumeInfo(NotationController *controller);

OSStatus CreateDirectoryIfNotPresent(FSRef *parentRef, CFStringRef subDirectoryName, FSRef *childRef) {
    UniChar chars[256];
    
    OSStatus result;
    if ((result = FSRefMakeInDirectoryWithString(parentRef, childRef, subDirectoryName, chars))) {
if (result == fnfErr) {
result = FSCreateDirectoryUnicode (parentRef, CFStringGetLength(subDirectoryName),
chars, kFSCatInfoNone, NULL, childRef, NULL, NULL);
}
return result;
    }
    
    return noErr;
}

OSStatus CreateTemporaryFile(FSRef *parentRef, FSRef *childTempRef) {
    UniChar chars[256];
    unsigned int nameLength = 0;
    OSStatus result = noErr;
    
    do {
CFStringRef filename = CreateRandomizedFileName();
nameLength = CFStringGetLength(filename);
result = FSRefMakeInDirectoryWithString(parentRef, childTempRef, filename, chars);
CFRelease(filename);

    } while (result == noErr);
    
    if (result == fnfErr) {
result = FSCreateFileUnicode(parentRef, nameLength, chars, kFSCatInfoNone, NULL, childTempRef, NULL);
    }
    
    return result;
}


/*
Read the UUID from a mounted volume, by calling getattrlist().
Assumes the path is the mount point of an HFS volume.
*/
static BOOL GetVolumeUUIDAttr(const char *path, VolumeUUID *volumeUUIDPtr) {
struct attrlist alist;
struct FinderAttrBuf {
u_int32_t info_length;
u_int32_t finderinfo[8];
} volFinderInfo;

int result = -1;

/* Set up the attrlist structure to get the volume's Finder Info */
alist.bitmapcount = 5;
alist.reserved = 0;
alist.commonattr = ATTR_CMN_FNDRINFO;
alist.volattr = ATTR_VOL_INFO;
alist.dirattr = 0;
alist.fileattr = 0;
alist.forkattr = 0;

/* Get the Finder Info */
if ((result = getattrlist(path, &alist, &volFinderInfo, sizeof(volFinderInfo), 0))) {
NSLog(@"GetVolumeUUIDAttr error: %d", result);
return NO;
}

/* Copy the UUID from the Finder Into to caller's buffer */
VolumeUUID *finderInfoUUIDPtr = (VolumeUUID *)(&volFinderInfo.finderinfo[6]);
volumeUUIDPtr->v.high = CFSwapInt32BigToHost(finderInfoUUIDPtr->v.high);
volumeUUIDPtr->v.low = CFSwapInt32BigToHost(finderInfoUUIDPtr->v.low);

return YES;
}


// Create a version 3 UUID; derived using "name" via MD5 checksum.
static void uuid_create_md5_from_name(unsigned char result_uuid[16], const void *name, int namelen) {

static unsigned char FSUUIDNamespaceSHA1[16] = {
0xB3, 0xE2, 0x0F, 0x39, 0xF2, 0x92, 0x11, 0xD6,
0x97, 0xA4, 0x00, 0x30, 0x65, 0x43, 0xEC, 0xAC
};

    MD5_CTX c;

    MD5_Init(&c);
    MD5_Update(&c, FSUUIDNamespaceSHA1, sizeof(FSUUIDNamespaceSHA1));
    MD5_Update(&c, name, namelen);
    MD5_Final(result_uuid, &c);

    result_uuid[6] = (result_uuid[6] & 0x0F) | 0x30;
    result_uuid[8] = (result_uuid[8] & 0x3F) | 0x80;
}


CFUUIDRef CopyHFSVolumeUUIDForMount(const char *mntonname) {
VolumeUUID targetVolumeUUID;

unsigned char rawUUID[8];

if (!GetVolumeUUIDAttr(mntonname, &targetVolumeUUID))
return NULL;

((uint32_t *)rawUUID)[0] = CFSwapInt32HostToBig(targetVolumeUUID.v.high);
((uint32_t *)rawUUID)[1] = CFSwapInt32HostToBig(targetVolumeUUID.v.low);

CFUUIDBytes uuidBytes;
uuid_create_md5_from_name((void*)&uuidBytes, rawUUID, sizeof(rawUUID));

return CFUUIDCreateFromUUIDBytes(NULL, uuidBytes);
}

CFUUIDRef CopySyntheticUUIDForVolumeCreationDate(FSRef *fsRef) {

FSCatalogInfo fileInfo;
if (FSGetCatalogInfo(fsRef, kFSCatInfoVolume, &fileInfo, NULL, NULL, NULL) == noErr) {

FSVolumeInfo volInfo;
OSStatus err = FSGetVolumeInfo(fileInfo.volume, 0, NULL, kFSVolInfoCreateDate, &volInfo, NULL, NULL);
if (err == noErr) {
volInfo.createDate.highSeconds = CFSwapInt16HostToBig(volInfo.createDate.highSeconds);
volInfo.createDate.lowSeconds = CFSwapInt32HostToBig(volInfo.createDate.lowSeconds);
volInfo.createDate.fraction = CFSwapInt16HostToBig(volInfo.createDate.fraction);

CFUUIDBytes uuidBytes;
uuid_create_md5_from_name((void*)&uuidBytes, (void*)&volInfo.createDate, sizeof(UTCDateTime));

return CFUUIDCreateFromUUIDBytes(NULL, uuidBytes);
} else {
NSLog(@"can't even get the volume creation date -- what are you trying to do to me?");
}
}
return NULL;
}

static BOOL VolumeSupportsExchangeObjects(NotationController *controller) {

if (controller->volumeSupportsExchangeObjects == -1) {
/* get source volume's path */
struct statfs * sfsb = StatFSVolumeInfo(controller);
if (sfsb) {
/* query getattrlist to see if that volume supports FSExchangeObjects */
controller->volumeSupportsExchangeObjects = ( 0 != (volumeCapabilities(sfsb->f_mntonname) & VOL_CAP_INT_EXCHANGEDATA));
}
}
return controller->volumeSupportsExchangeObjects;
}

- (void)purgeOldPerDiskInfoFromNotes {
//here's where notes' PerDiskInfo arrays would have older times removed, depending on -[DiskUUIDEntry lastAccessed]
//each note will use RemovePerDiskInfoWithTableIndex
}

- (void)initializeDiskUUIDIfNecessary {
//create a CFUUIDRef that identifies the volume this database sits on

//don't bother unless we will be reading notes as separate files; otherwise there's no need to track the source of the attr mod dates
//maybe disk UUIDs will be used in the future for something else; at that point this check should be altered

if (!diskUUID && [self currentNoteStorageFormat] != SingleDatabaseFormat) {

struct statfs * sfsb = StatFSVolumeInfo(self);
//if this is not an hfs+ disk, then get the FSEvents UUID
//if this is not Leopard or the FSEvents UUID is null,
//then take MD5 sum of creation date + some other info?

if (!strcmp(sfsb->f_fstypename, "hfs")) {
//if this is an HFS volume, then use getattrlist to get finderinfo from the volume
diskUUID = CopyHFSVolumeUUIDForMount(sfsb->f_mntonname);
}

//ah but what happens when a non-hfs disk is first mounted on leopard+, and then moves to a tiger machine?
//or vise-versa; that calls for tracking how the UUIDs were generated, and grouping them together when others are found;
//this is probably unnecessary for now
if (!diskUUID && IsLeopardOrLater) {
//this is not an hfs disk, and this computer is new enough to have FSEvents
diskUUID = FSEventsCopyUUIDForDevice(sfsb->f_fsid.val[0]);
}

if (!diskUUID) {
//all other checks failed; just use the volume's creation date
diskUUID = CopySyntheticUUIDForVolumeCreationDate(&noteDirectoryRef);
}
diskUUIDIndex = [notationPrefs tableIndexOfDiskUUID:diskUUID];
}
}

static struct statfs *StatFSVolumeInfo(NotationController *controller) {
if (!controller->statfsInfo) {
OSStatus err = noErr;
const UInt32 maxPathSize = 4 * 1024;
UInt8 *convertedPath = (UInt8*)malloc(maxPathSize * sizeof(UInt8));

if ((err = FSRefMakePath(&(controller->noteDirectoryRef), convertedPath, maxPathSize)) == noErr) {

controller->statfsInfo = calloc(1, sizeof(struct statfs));

if (statfs((char*)convertedPath, controller->statfsInfo))
NSLog(@"statfs: error %d\n", errno);
} else
NSLog(@"FSRefMakePath: error %d\n", err);

free(convertedPath);
}
return controller->statfsInfo;
}

UInt32 diskUUIDIndexForNotation(NotationController *controller) {
return controller->diskUUIDIndex;
}

long BlockSizeForNotation(NotationController *controller) {
    if (!controller->blockSize) {
long iosize = 0;

struct statfs * sfsb = StatFSVolumeInfo(controller);
if (sfsb) iosize = sfsb->f_iosize;

controller->blockSize = MAX(iosize, 16 * 1024);
    }
    
    return controller->blockSize;
}

- (OSStatus)refreshFileRefIfNecessary:(FSRef *)childRef withName:(NSString *)filename charsBuffer:(UniChar*)charsBuffer {
BOOL isOwned = NO;
if (IsZeros(childRef, sizeof(FSRef)) || [self fileInNotesDirectory:childRef isOwnedByUs:&isOwned hasCatalogInfo:NULL] != noErr || !isOwned) {
OSStatus err = noErr;
if ((err = FSRefMakeInDirectoryWithString(&noteDirectoryRef, childRef, (CFStringRef)filename, charsBuffer)) != noErr) {
NSLog(@"Could not get an fsref for file with name %@: %d\n", filename, err);
return err;
}
    }
return noErr;
}


- (BOOL)notesDirectoryIsTrashed {
Boolean isInTrash = false;
if (FSDetermineIfRefIsEnclosedByFolder(0, kTrashFolderType, &noteDirectoryRef, &isInTrash) != noErr)
isInTrash = false;
return (BOOL)isInTrash;
}

- (BOOL)notesDirectoryContainsFile:(NSString*)filename returningFSRef:(FSRef*)childRef {
UniChar chars[256];
if (!filename) return NO;

return FSRefMakeInDirectoryWithString(&noteDirectoryRef, childRef, (CFStringRef)filename, chars) == noErr;
}

- (OSStatus)renameAndForgetNoteDatabaseFile:(NSString*)newfilename {
//this method does not move the note database file; for now it is used in cases of upgrading incompatible files

UniChar chars[256];
    OSStatus err = noErr;
CFRange range = {0, CFStringGetLength((CFStringRef)newfilename)};
    CFStringGetCharacters((CFStringRef)newfilename, range, chars);
    
    if ((err = FSRenameUnicode(&noteDatabaseRef, range.length, chars, kTextEncodingDefaultFormat, NULL)) != noErr) {
NSLog(@"Error renaming notes database file to %@: %d", newfilename, err);
return err;
    }
//reset the FSRef to ensure it doesn't point to the renamed file
bzero(&noteDatabaseRef, sizeof(FSRef));
return noErr;
}

- (BOOL)removeSpuriousDatabaseFileNotes {
//remove any notes that might have been made out of the database or write-ahead-log files by accident
//but leave the files intact; ensure only that they are also remotely unsynced
//returns true if at least one note was removed, in which case allNotes should probably be refiltered

NSUInteger i = 0;
NoteObject *dbNote = nil, *walNote = nil;

for (i=0; i<[allNotes count]; i++) {
NoteObject *obj = [allNotes objectAtIndex:i];

if (!dbNote && [filenameOfNote(obj) isEqualToString:NotesDatabaseFileName])
dbNote = [[obj retain] autorelease];
if (!walNote && [filenameOfNote(obj) isEqualToString:@"Interim Note-Changes"])
walNote = [[obj retain] autorelease];
}
if (dbNote) {
[allNotes removeObjectIdenticalTo:dbNote];
[self _addDeletedNote:dbNote];
}
if (walNote) {
[allNotes removeObjectIdenticalTo:walNote];
[self _addDeletedNote:walNote];
}
return walNote || dbNote;
}

- (void)relocateNotesDirectory {

while (1) {
NSOpenPanel *openPanel = [NSOpenPanel openPanel];
[openPanel setCanCreateDirectories:YES];
[openPanel setCanChooseFiles:NO];
[openPanel setCanChooseDirectories:YES];
[openPanel setResolvesAliases:YES];
[openPanel setAllowsMultipleSelection:NO];
[openPanel setTreatsFilePackagesAsDirectories:NO];
[openPanel setTitle:NSLocalizedString(@"Select a folder",nil)];
[openPanel setPrompt:NSLocalizedString(@"Select",nil)];
[openPanel setMessage:NSLocalizedString(@"Select a new location for your Notational Velocity notes.",nil)];

if ([openPanel runModal] == NSOKButton) {
CFStringRef filename = (CFStringRef)[openPanel filename];
if (filename) {

FSRef newParentRef;
CFURLRef url = CFURLCreateWithFileSystemPath(kCFAllocatorDefault, filename, kCFURLPOSIXPathStyle, true);
[(id)url autorelease];
if (!url || !CFURLGetFSRef(url, &newParentRef)) {
NSRunAlertPanel(NSLocalizedString(@"Unable to create an FSRef from the chosen directory.",nil),
NSLocalizedString(@"Your notes were not moved.",nil), NSLocalizedString(@"OK",nil), NULL, NULL);
continue;
}

FSRef newNotesDirectory;
OSErr err = FSMoveObject(&noteDirectoryRef, &newParentRef, &newNotesDirectory);
if (err != noErr) {
NSRunAlertPanel([NSString stringWithFormat:NSLocalizedString(@"Couldn't move notes into the chosen folder because %@",nil),
[NSString reasonStringFromCarbonFSError:err]], NSLocalizedString(@"Your notes were not moved.",nil), NSLocalizedString(@"OK",nil), NULL, NULL);
continue;
}

if (FSCompareFSRefs(&noteDirectoryRef, &newNotesDirectory) != noErr) {
NSData *aliasData = [NSData aliasDataForFSRef:&newNotesDirectory];
if (aliasData) [[GlobalPrefs defaultPrefs] setAliasDataForDefaultDirectory:aliasData sender:self];
//we must quit now, as notes will very likely be re-initialized in the same place
goto terminate;
}

//directory move successful! //show the user where new notes are
NSString *newNotesPath = [[NSFileManager defaultManager] pathWithFSRef:&newNotesDirectory];
if (newNotesPath) [[NSWorkspace sharedWorkspace] selectFile:newNotesPath inFileViewerRootedAtPath:nil];

break;
} else {
goto terminate;
}
} else {
terminate:
[NSApp terminate:nil];
break;
}
}
}

+ (OSStatus)getDefaultNotesDirectoryRef:(FSRef*)notesDir {
    FSRef appSupportFoundRef;
    
    OSErr err = FSFindFolder(kUserDomain, kApplicationSupportFolderType, kCreateFolder, &appSupportFoundRef);
    if (err != noErr) {
NSLog(@"Unable to locate or create an Application Support directory: %d", err);
return err;
    } else {
//now try to get Notational Database directory
if ((err = CreateDirectoryIfNotPresent(&appSupportFoundRef, (CFStringRef)@"Notational Data", notesDir)) != noErr) {

return err;
}
    }
    return noErr;
}

//whenever a note uses this method to change its filename, we will have to re-establish all the links to it
- (NSString*)uniqueFilenameForTitle:(NSString*)title fromNote:(NoteObject*)note {
    //generate a unique filename based on title, varying numbers
    BOOL isUnique = YES;
    NSString *uniqueFilename = title;

//remove illegal characters
NSMutableString *sanitizedName = [[[uniqueFilename stringByReplacingOccurrencesOfString:@":" withString:@"-"] mutableCopy] autorelease];
if ([sanitizedName characterAtIndex:0] == (unichar)'.') [sanitizedName replaceCharactersInRange:NSMakeRange(0, 1) withString:@"_"];
uniqueFilename = [[sanitizedName copy] autorelease];

//use the note's current format if the current default format is for a database; get the "ideal" extension for that format
int noteFormat = [notationPrefs notesStorageFormat] || !note ? [notationPrefs notesStorageFormat] : storageFormatOfNote(note);
NSString *extension = [notationPrefs chosenPathExtensionForFormat:noteFormat];

//if the note's current extension is compatible with the storage format above, then use the existing extension instead
if (note && filenameOfNote(note) && [notationPrefs pathExtensionAllowed:[filenameOfNote(note) pathExtension] forFormat:noteFormat])
extension = [filenameOfNote(note) pathExtension];

//assume that we won't have more than 999 notes with the exact same name and of more than 247 chars
uniqueFilename = [uniqueFilename filenameExpectingAdditionalCharCount:3 + [extension length] + 2];

    unsigned int iteration = 0;
    do {
isUnique = YES;
unsigned int i;

//this ought to just use an nsset, but then we'd have to maintain a parallel data structure for marginal benefit
//also, it won't quite work right for filenames with no (real) extensions and periods in their names
for (i=0; i<[allNotes count]; i++) {
NoteObject *aNote = [allNotes objectAtIndex:i];
NSString *basefilename = [filenameOfNote(aNote) stringByDeletingPathExtension];

if (note != aNote && [basefilename caseInsensitiveCompare:uniqueFilename] == NSOrderedSame) {
isUnique = NO;

uniqueFilename = [uniqueFilename stringByDeletingPathExtension];
NSString *numberPath = [[NSNumber numberWithInt:++iteration] stringValue];
uniqueFilename = [uniqueFilename stringByAppendingPathExtension:numberPath];
break;
}
}
    } while (!isUnique);

    return [uniqueFilename stringByAppendingPathExtension:extension];
}

- (OSStatus)noteFileRenamed:(FSRef*)childRef fromName:(NSString*)oldName toName:(NSString*)newName {
    if (![self currentNoteStorageFormat])
return noErr;
    
    UniChar chars[256];
    
    OSStatus err = [self refreshFileRefIfNecessary:childRef withName:oldName charsBuffer:chars];
if (noErr != err) return err;
    
    CFRange range = {0, CFStringGetLength((CFStringRef)newName)};
    CFStringGetCharacters((CFStringRef)newName, range, chars);
    
    if ((err = FSRenameUnicode(childRef, range.length, chars, kTextEncodingDefaultFormat, childRef)) != noErr) {
NSLog(@"Error renaming file %@ to %@: %d", oldName, newName, err);
return err;
    }
    
    return noErr;
}

- (OSStatus)fileInNotesDirectory:(FSRef*)childRef isOwnedByUs:(BOOL*)owned hasCatalogInfo:(FSCatalogInfo *)info {
    FSRef parentRef;
    FSCatalogInfoBitmap whichInfo = kFSCatInfoNone;
    
    if (owned) *owned = NO;
    
    if (info) {
whichInfo = kFSCatInfoContentMod | kFSCatInfoCreateDate | kFSCatInfoAttrMod | kFSCatInfoNodeID | kFSCatInfoDataSizes;
bzero(info, sizeof(FSCatalogInfo));
    }
    
    OSStatus err = noErr;
    
    if ((err = FSGetCatalogInfo(childRef, whichInfo, info, NULL, NULL, &parentRef)) != noErr)
return err;
    
    if (owned) *owned = (FSCompareFSRefs(&parentRef, &noteDirectoryRef) == noErr);
    
    return noErr;
}

- (OSStatus)deleteFileInNotesDirectory:(FSRef*)childRef forFilename:(NSString*)filename {
    UniChar chars[256];
    OSStatus err = [self refreshFileRefIfNecessary:childRef withName:filename charsBuffer:chars];
    if (noErr != err) return err;

if ((err = FSDeleteObject(childRef)) != noErr) {
NSLog(@"Error deleting file: %d", err);
return err;
}
    
    return noErr;
}

- (NSMutableData*)dataFromFileInNotesDirectory:(FSRef*)childRef forFilename:(NSString*)filename {
    return [self dataFromFileInNotesDirectory:childRef forFilename:filename fileSize:0];
}

- (NSMutableData*)dataFromFileInNotesDirectory:(FSRef*)childRef forCatalogEntry:(NoteCatalogEntry*)catEntry {
    return [self dataFromFileInNotesDirectory:childRef forFilename:(NSString*)catEntry->filename fileSize:catEntry->logicalSize];
}

- (NSMutableData*)dataFromFileInNotesDirectory:(FSRef*)childRef forFilename:(NSString*)filename fileSize:(UInt64)givenFileSize {

    UInt64 fileSize = givenFileSize;
    char *notesDataPtr = NULL;
    
UniChar chars[256];
OSStatus err = [self refreshFileRefIfNecessary:childRef withName:filename charsBuffer:chars];
if (noErr != err) return nil;

    if ((err = FSRefReadData(childRef, BlockSizeForNotation(self), &fileSize, (void**)&notesDataPtr, noCacheMask)) != noErr) {
NSLog(@"%s: error %d", _cmd, err);
return nil;
}
    if (!notesDataPtr)
return nil;
    
    return [[[NSMutableData alloc] initWithBytesNoCopy:notesDataPtr length:fileSize freeWhenDone:YES] autorelease];
}

- (OSStatus)createFileIfNotPresentInNotesDirectory:(FSRef*)childRef forFilename:(NSString*)filename fileWasCreated:(BOOL*)created {

return FSCreateFileIfNotPresentInDirectory(&noteDirectoryRef, childRef, (CFStringRef)filename, (Boolean*)created);
}

- (OSStatus)storeDataAtomicallyInNotesDirectory:(NSData*)data withName:(NSString*)filename destinationRef:(FSRef*)destRef {
return [self storeDataAtomicallyInNotesDirectory:data withName:filename destinationRef:destRef verifyWithSelector:NULL verificationDelegate:nil];
}

//either name or destRef must be valid; destRef is declared invalid by filling the struct with 0

- (OSStatus)storeDataAtomicallyInNotesDirectory:(NSData*)data withName:(NSString*)filename destinationRef:(FSRef*)destRef
verifyWithSelector:(SEL)verificationSel verificationDelegate:(id)verifyDelegate {
    OSStatus err = noErr;
    
FSRef tempFileRef;
    if ((err = CreateTemporaryFile(&noteDirectoryRef, &tempFileRef)) != noErr) {
NSLog(@"error creating temporary file: %d", err);
return err;
    }
    
    //now write to temporary file and swap
    if ((err = FSRefWriteData(&tempFileRef, BlockSizeForNotation(self), [data length], [data bytes], pleaseCacheMask, false)) != noErr) {
NSLog(@"error writing to temporary file: %d", err);

return err;
    }

//before we try to swap the data contents of this temp file with the (possibly even soon-to-be-created) Notes & Settings file,
//try to read it back and see if it can be decrypted and decoded:
if (verifyDelegate && verificationSel) {
if (noErr != (err = [[verifyDelegate performSelector:verificationSel withObject:[NSValue valueWithPointer:&tempFileRef] withObject:filename] intValue])) {
NSLog(@"couldn't verify written notes, so not continuing to save");
(void)FSDeleteObject(&tempFileRef);
return err;
}
}
    
//don't try to make a new fsref if the file is still inside notes folder, but perhaps under a different name
BOOL isOwned = NO;
if (IsZeros(destRef,sizeof(FSRef)) || [self fileInNotesDirectory:destRef isOwnedByUs:&isOwned hasCatalogInfo:NULL] != noErr || !isOwned) {

if ((err = [self createFileIfNotPresentInNotesDirectory:destRef forFilename:filename fileWasCreated:nil]) != noErr) {
NSLog(@"error creating or getting fsref for file %@: %d", filename, err);
return err;
}
    }
    //if destRef is not zeros, just assume that it exists and retry if it doesn't
FSRef newSourceRef, newDestRef;

if (VolumeSupportsExchangeObjects(self) != 1) {
//NSLog(@"emulating fsexchange objects");
if ((err = FSExchangeObjectsEmulate(&tempFileRef, destRef, &newSourceRef, &newDestRef)) == noErr) {
memcpy(&tempFileRef, &newSourceRef, sizeof(FSRef));
memcpy(destRef, &newDestRef, sizeof(FSRef));
}
} else {
err = FSExchangeObjects(&tempFileRef, destRef);
}

    if (err != noErr) {
NSLog(@"error exchanging contents of temporary file with destination file %@: %d",filename, err);
return err;
    }
    
    if ((err = FSDeleteObject(&tempFileRef)) != noErr) {
NSLog(@"Error deleting temporary file: %d; moving to trash", err);
if ((err = [self moveFileToTrash:&tempFileRef forFilename:nil]) != noErr)
NSLog(@"Error moving file to trash: %d\n", err);
    }
    
    return noErr;
}


- (void)notifyOfChangedTrash {
FSRef folder;

OSStatus err = [NotationController trashFolderRef:&folder forChild:&noteDirectoryRef];

if (err == noErr)
FNNotify(&folder, kFNDirectoryModifiedMessage, kNilOptions);
else
NSLog(@"notifyOfChangedTrash: error getting trash: %d", err);

NSString *sillyDirectory = [NSTemporaryDirectory() stringByAppendingPathComponent:[(NSString*)CreateRandomizedFileName() autorelease]];
[[NSFileManager defaultManager] createDirectoryAtPath:sillyDirectory attributes:nil];
NSInteger tag = 0;
[[NSWorkspace sharedWorkspace] performFileOperation:NSWorkspaceRecycleOperation source:NSTemporaryDirectory() destination:@""
files:[NSArray arrayWithObject:[sillyDirectory lastPathComponent]] tag:&tag];
}

+ (OSStatus)trashFolderRef:(FSRef*)trashRef forChild:(FSRef*)childRef {
    FSVolumeRefNum volume = kOnAppropriateDisk;
    FSCatalogInfo info;
    // get the volume the file resides on and use this as the base for finding the trash folder
    // since each volume will contain its own trash folder...
    
    if (FSGetCatalogInfo(childRef, kFSCatInfoVolume, &info, NULL, NULL, NULL) == noErr)
volume = info.volume;
    // go ahead and find the trash folder on that volume.
    // the trash folder for the current user may not yet exist on that volume, so ask to automatically create it

return FSFindFolder(volume, kTrashFolderType, kCreateFolder, trashRef);
}

- (OSStatus)moveFileToTrash:(FSRef *)childRef forFilename:(NSString*)filename {
UniChar chars[256];
    
OSStatus err = [self refreshFileRefIfNecessary:childRef withName:filename charsBuffer:chars];
if (noErr != err) return err;

FSRef folder;
if ([NotationController trashFolderRef:&folder forChild:childRef] != noErr)
return err;

err = FSMoveObject(childRef, &folder, NULL);
if (err == dupFNErr) {
// try to rename the duplicate file in the trash

HFSUniStr255 name;

err = FSGetCatalogInfo(childRef, kFSCatInfoNone, NULL, &name, NULL, NULL);
if (err == noErr) {
UInt16 origLen = name.length;
if (origLen > 245)
origLen = 245;

FSRef duplicateFile;
err = FSMakeFSRefUnicode(&folder, name.length, name.unicode, kTextEncodingUnknown, &duplicateFile);
int i = 1, j;
while (1) {
i++;
// attempt to create new unique name
HFSUniStr255 newName = name;
char num[16];
int numLen;

numLen = sprintf(num, "%d", i);
newName.unicode[origLen] = ' ';
for (j=0; j < numLen; j++)
newName.unicode[origLen + j + 1] = num[j];
newName.length = origLen + numLen + 1;

err = FSRenameUnicode(&duplicateFile, newName.length, newName.unicode, kTextEncodingUnknown, NULL);
if (err != dupFNErr)
break;
}
if (err == noErr)
err = FSMoveObject(childRef, &folder, NULL);
}
}

if (err == noErr) {
FSCatalogInfo catInfo;

CFAbsoluteTime now = CFAbsoluteTimeGetCurrent();
err = UCConvertCFAbsoluteTimeToUTCDateTime(now, &catInfo.contentModDate);
if (err == noErr)
err = FSSetCatalogInfo(&noteDirectoryRef, kFSCatInfoContentMod, &catInfo);
if (err) {
NSLog(@"couldn't touch modification date of file's parent folder: error %d", err);
err = noErr;
}
}
    
    return err;
}

@end
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