/******************************************************************************
 * Copyright (c) 2006-2012 Transmission authors and contributors
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 *****************************************************************************/

#include <libtransmission/transmission.h>
#include <libtransmission/error.h>
#include <libtransmission/log.h>
#include <libtransmission/utils.h> // tr_new()

#import "Torrent.h"
#import "GroupsController.h"
#import "FileListNode.h"
#import "NSApplicationAdditions.h"
#import "NSStringAdditions.h"
#import "TrackerNode.h"

#define ETA_IDLE_DISPLAY_SEC (2*60)

@interface Torrent (Private)

- (id) initWithPath: (NSString *) path hash: (NSString *) hashString torrentStruct: (tr_torrent *) torrentStruct
        magnetAddress: (NSString *) magnetAddress lib: (tr_session *) lib
        groupValue: (NSNumber *) groupValue
        removeWhenFinishSeeding: (NSNumber *) removeWhenFinishSeeding
        downloadFolder: (NSString *) downloadFolder
        legacyIncompleteFolder: (NSString *) incompleteFolder;

- (void) createFileList;
- (void) insertPathForComponents: (NSArray *) components withComponentIndex: (NSUInteger) componentIndex forParent: (FileListNode *) parent fileSize: (uint64_t) size
    index: (NSInteger) index flatList: (NSMutableArray *) flatFileList;
- (void) sortFileList: (NSMutableArray *) fileNodes;

- (void) startQueue;
- (void) completenessChange: (tr_completeness) status wasRunning: (BOOL) wasRunning;
- (void) ratioLimitHit;
- (void) idleLimitHit;
- (void) metadataRetrieved;
- (void)renameFinished: (BOOL) success nodes: (NSArray *) nodes completionHandler: (void (^)(BOOL)) completionHandler oldPath: (NSString *) oldPath newName: (NSString *) newName;

- (BOOL) shouldShowEta;
- (NSString *) etaString;

- (void) setTimeMachineExclude: (BOOL) exclude;

@end

void startQueueCallback(tr_torrent * torrent, void * torrentData)
{
    dispatch_async(dispatch_get_main_queue(), ^{
        [(__bridge Torrent *)torrentData startQueue];
    });
}

void completenessChangeCallback(tr_torrent * torrent, tr_completeness status, bool wasRunning, void * torrentData)
{
    dispatch_async(dispatch_get_main_queue(), ^{
        [(__bridge Torrent *)torrentData completenessChange: status wasRunning: wasRunning];
    });
}

void ratioLimitHitCallback(tr_torrent * torrent, void * torrentData)
{
    dispatch_async(dispatch_get_main_queue(), ^{
        [(__bridge Torrent *)torrentData ratioLimitHit];
    });
}

void idleLimitHitCallback(tr_torrent * torrent, void * torrentData)
{
    dispatch_async(dispatch_get_main_queue(), ^{
        [(__bridge Torrent *)torrentData idleLimitHit];
    });
}

void metadataCallback(tr_torrent * torrent, void * torrentData)
{
    dispatch_async(dispatch_get_main_queue(), ^{
        [(__bridge Torrent *)torrentData metadataRetrieved];
    });
}

void renameCallback(tr_torrent * torrent, const char * oldPathCharString, const char * newNameCharString, int error, void * contextInfo)
{
    @autoreleasepool {
        NSString * oldPath = @(oldPathCharString);
        NSString * newName = @(newNameCharString);

        dispatch_async(dispatch_get_main_queue(), ^{
            NSDictionary * contextDict = (__bridge_transfer NSDictionary *)contextInfo;
            Torrent * torrentObject = contextDict[@"Torrent"];
            [torrentObject renameFinished: error == 0 nodes: contextDict[@"Nodes"] completionHandler: contextDict[@"CompletionHandler"] oldPath: oldPath newName: newName];
        });
    }
}

bool trashDataFile(const char * filename, tr_error ** error)
{
    if (filename == NULL)
        return false;

    @autoreleasepool
    {
        NSError * localError;
        if (![Torrent trashFile: @(filename) error: &localError])
        {
            tr_error_set_literal(error, [localError code], [[localError description] UTF8String]);
            return false;
        }
    }

    return true;
}

@implementation Torrent
{
    tr_torrent * fHandle;
    const tr_info * fInfo;
    const tr_stat * fStat;

    NSUserDefaults * fDefaults;

    NSImage * fIcon;

    NSString * fHashString;

    tr_file_stat * fFileStat;
    NSArray * fFileList, * fFlatFileList;

    NSIndexSet * fPreviousFinishedIndexes;
    NSDate * fPreviousFinishedIndexesDate;

    NSInteger fGroupValue;
    TorrentDeterminationType fGroupValueDetermination;

    TorrentDeterminationType fDownloadFolderDetermination;

    BOOL fResumeOnWake;

    BOOL fTimeMachineExcludeInitialized;
}

- (id) initWithPath: (NSString *) path location: (NSString *) location deleteTorrentFile: (BOOL) torrentDelete
        lib: (tr_session *) lib
{
    self = [self initWithPath: path hash: nil torrentStruct: NULL magnetAddress: nil lib: lib
            groupValue: nil
            removeWhenFinishSeeding: nil
            downloadFolder: location
            legacyIncompleteFolder: nil];

    if (self)
    {
        if (torrentDelete && ![[self torrentLocation] isEqualToString: path])
            [Torrent trashFile: path error: nil];
    }
    return self;
}

- (id) initWithTorrentStruct: (tr_torrent *) torrentStruct location: (NSString *) location lib: (tr_session *) lib
{
    self = [self initWithPath: nil hash: nil torrentStruct: torrentStruct magnetAddress: nil lib: lib
            groupValue: nil
            removeWhenFinishSeeding: nil
            downloadFolder: location
            legacyIncompleteFolder: nil];

    return self;
}

- (id) initWithMagnetAddress: (NSString *) address location: (NSString *) location lib: (tr_session *) lib
{
    self = [self initWithPath: nil hash: nil torrentStruct: nil magnetAddress: address
            lib: lib groupValue: nil
            removeWhenFinishSeeding: nil
            downloadFolder: location legacyIncompleteFolder: nil];

    return self;
}

- (id) initWithHistory: (NSDictionary *) history lib: (tr_session *) lib forcePause: (BOOL) pause
{
    self = [self initWithPath: history[@"InternalTorrentPath"]
                hash: history[@"TorrentHash"]
                torrentStruct: NULL
                magnetAddress: nil
                lib: lib
                groupValue: history[@"GroupValue"]
                removeWhenFinishSeeding: history[@"RemoveWhenFinishSeeding"]
                downloadFolder: history[@"DownloadFolder"] //upgrading from versions < 1.80
                legacyIncompleteFolder: [history[@"UseIncompleteFolder"] boolValue] //upgrading from versions < 1.80
                                        ? history[@"IncompleteFolder"] : nil];

    if (self)
    {
        //start transfer
        NSNumber * active;
        if (!pause && (active = history[@"Active"]) && [active boolValue])
        {
            fStat = tr_torrentStat(fHandle);
            [self startTransferNoQueue];
        }

        //upgrading from versions < 1.30: get old added, activity, and done dates
        NSDate * date;
        if ((date = history[@"Date"]))
            tr_torrentSetAddedDate(fHandle, [date timeIntervalSince1970]);
        if ((date = history[@"DateActivity"]))
            tr_torrentSetActivityDate(fHandle, [date timeIntervalSince1970]);
        if ((date = history[@"DateCompleted"]))
            tr_torrentSetDoneDate(fHandle, [date timeIntervalSince1970]);

        //upgrading from versions < 1.60: get old stop ratio settings
        NSNumber * ratioSetting;
        if ((ratioSetting = history[@"RatioSetting"]))
        {
            switch ([ratioSetting intValue])
            {
                case NSOnState: [self setRatioSetting: TR_RATIOLIMIT_SINGLE]; break;
                case NSOffState: [self setRatioSetting: TR_RATIOLIMIT_UNLIMITED]; break;
                case NSMixedState: [self setRatioSetting: TR_RATIOLIMIT_GLOBAL]; break;
            }
        }
        NSNumber * ratioLimit;
        if ((ratioLimit = history[@"RatioLimit"]))
            [self setRatioLimit: [ratioLimit floatValue]];
    }
    return self;
}

- (NSDictionary *) history
{
    return @{
            @"InternalTorrentPath": [self torrentLocation],
            @"TorrentHash": [self hashString],
            @"Active": @([self isActive]),
            @"WaitToStart": @([self waitingToStart]),
            @"GroupValue": @(fGroupValue),
            @"RemoveWhenFinishSeeding": @(_removeWhenFinishSeeding)};
}

- (void) dealloc
{
    [[NSNotificationCenter defaultCenter] removeObserver: self];

    if (fFileStat)
        tr_torrentFilesFree(fFileStat, [self fileCount]);
}

- (NSString *) description
{
    return [@"Torrent: " stringByAppendingString: [self name]];
}

- (id) copyWithZone: (NSZone *) zone
{
    return self;
}

- (void) closeRemoveTorrent: (BOOL) trashFiles
{
    //allow the file to be indexed by Time Machine
    [self setTimeMachineExclude: NO];

    tr_torrentRemove(fHandle, trashFiles, trashDataFile);
}

- (void) changeDownloadFolderBeforeUsing: (NSString *) folder determinationType: (TorrentDeterminationType) determinationType
{
    //if data existed in original download location, unexclude it before changing the location
    [self setTimeMachineExclude: NO];

    tr_torrentSetDownloadDir(fHandle, [folder UTF8String]);

    fDownloadFolderDetermination = determinationType;
}

- (NSString *) currentDirectory
{
    return @(tr_torrentGetCurrentDir(fHandle));
}

- (void) getAvailability: (int8_t *) tab size: (NSInteger) size
{
    tr_torrentAvailability(fHandle, tab, size);
}

- (void) getAmountFinished: (float *) tab size: (NSInteger) size
{
    tr_torrentAmountFinished(fHandle, tab, size);
}

- (NSIndexSet *) previousFinishedPieces
{
    //if the torrent hasn't been seen in a bit, and therefore hasn't been refreshed, return nil
    if (fPreviousFinishedIndexesDate && [fPreviousFinishedIndexesDate timeIntervalSinceNow] > -2.0)
        return fPreviousFinishedIndexes;
    else
        return nil;
}

- (void) setPreviousFinishedPieces: (NSIndexSet *) indexes
{
    fPreviousFinishedIndexes = indexes;

    fPreviousFinishedIndexesDate = indexes != nil ? [[NSDate alloc] init] : nil;
}

- (void) update
{
    //get previous stalled value before update
    const BOOL wasStalled = fStat != NULL && [self isStalled];

    fStat = tr_torrentStat(fHandle);

    //make sure the "active" filter is updated when stalled-ness changes
    if (wasStalled != [self isStalled])
        //posting asynchronously with coalescing to prevent stack overflow on lots of torrents changing state at the same time
        [[NSNotificationQueue defaultQueue] enqueueNotification: [NSNotification notificationWithName: @"UpdateQueue" object: self]
                                                   postingStyle: NSPostASAP
                                                   coalesceMask: NSNotificationCoalescingOnName
                                                       forModes: nil];

    //when the torrent is first loaded, update the time machine exclusion
    if (!fTimeMachineExcludeInitialized)
        [self updateTimeMachineExclude];
}

- (void) startTransferIgnoringQueue: (BOOL) ignoreQueue
{
    if ([self alertForRemainingDiskSpace])
    {
        ignoreQueue ? tr_torrentStartNow(fHandle) : tr_torrentStart(fHandle);
        [self update];

        //capture, specifically, stop-seeding settings changing to unlimited
        [[NSNotificationCenter defaultCenter] postNotificationName: @"UpdateOptions" object: nil];
    }
}

- (void) startTransferNoQueue
{
    [self startTransferIgnoringQueue: YES];
}

- (void) startTransfer
{
    [self startTransferIgnoringQueue: NO];
}

- (void) stopTransfer
{
    tr_torrentStop(fHandle);
    [self update];
}

- (void) sleep
{
    if ((fResumeOnWake = [self isActive]))
        tr_torrentStop(fHandle);
}

- (void) wakeUp
{
    if (fResumeOnWake)
    {
        tr_logAddNamedInfo( fInfo->name, "restarting because of wakeUp" );
        tr_torrentStart(fHandle);
    }
}

- (NSInteger) queuePosition
{
    return fStat->queuePosition;
}

- (void) setQueuePosition: (NSUInteger) index
{
    tr_torrentSetQueuePosition(fHandle, index);
}

- (void) manualAnnounce
{
    tr_torrentManualUpdate(fHandle);
}

- (BOOL) canManualAnnounce
{
    return tr_torrentCanManualUpdate(fHandle);
}

- (void) resetCache
{
    tr_torrentVerify(fHandle, NULL, NULL);
    [self update];
}

- (BOOL) isMagnet
{
    return !tr_torrentHasMetadata(fHandle);
}

- (NSString *) magnetLink
{
    return @(tr_torrentGetMagnetLink(fHandle));
}

- (CGFloat) ratio
{
    return fStat->ratio;
}

- (tr_ratiolimit) ratioSetting
{
    return tr_torrentGetRatioMode(fHandle);
}

- (void) setRatioSetting: (tr_ratiolimit) setting
{
    tr_torrentSetRatioMode(fHandle, setting);
}

- (CGFloat) ratioLimit
{
    return tr_torrentGetRatioLimit(fHandle);
}

- (void) setRatioLimit: (CGFloat) limit
{
    NSParameterAssert(limit >= 0);

    tr_torrentSetRatioLimit(fHandle, limit);
}

- (CGFloat) progressStopRatio
{
    return fStat->seedRatioPercentDone;
}

- (tr_idlelimit) idleSetting
{
    return tr_torrentGetIdleMode(fHandle);
}

- (void) setIdleSetting: (tr_idlelimit) setting
{
    tr_torrentSetIdleMode(fHandle, setting);
}

- (NSUInteger) idleLimitMinutes
{
    return tr_torrentGetIdleLimit(fHandle);
}

- (void) setIdleLimitMinutes: (NSUInteger) limit
{
    NSParameterAssert(limit > 0);

    tr_torrentSetIdleLimit(fHandle, limit);
}

- (BOOL) usesSpeedLimit: (BOOL) upload
{
    return tr_torrentUsesSpeedLimit(fHandle, upload ? TR_UP : TR_DOWN);
}

- (void) setUseSpeedLimit: (BOOL) use upload: (BOOL) upload
{
    tr_torrentUseSpeedLimit(fHandle, upload ? TR_UP : TR_DOWN, use);
}

- (NSInteger) speedLimit: (BOOL) upload
{
    return tr_torrentGetSpeedLimit_KBps(fHandle, upload ? TR_UP : TR_DOWN);
}

- (void) setSpeedLimit: (NSInteger) limit upload: (BOOL) upload
{
    tr_torrentSetSpeedLimit_KBps(fHandle, upload ? TR_UP : TR_DOWN, limit);
}

- (BOOL) usesGlobalSpeedLimit
{
    return tr_torrentUsesSessionLimits(fHandle);
}

- (void) setUseGlobalSpeedLimit: (BOOL) use
{
    tr_torrentUseSessionLimits(fHandle, use);
}

- (void) setMaxPeerConnect: (uint16_t) count
{
    NSParameterAssert(count > 0);

    tr_torrentSetPeerLimit(fHandle, count);
}

- (uint16_t) maxPeerConnect
{
    return tr_torrentGetPeerLimit(fHandle);
}
- (BOOL) waitingToStart
{
    return fStat->activity == TR_STATUS_DOWNLOAD_WAIT || fStat->activity == TR_STATUS_SEED_WAIT;
}

- (tr_priority_t) priority
{
    return tr_torrentGetPriority(fHandle);
}

- (void) setPriority: (tr_priority_t) priority
{
    return tr_torrentSetPriority(fHandle, priority);
}

+ (BOOL) trashFile: (NSString *) path error: (NSError **) error
{
    //attempt to move to trash
    if (![[NSWorkspace sharedWorkspace] performFileOperation: NSWorkspaceRecycleOperation
                                                      source: [path stringByDeletingLastPathComponent] destination: @""
                                                       files: @[[path lastPathComponent]] tag: nil])
    {
        //if cannot trash, just delete it (will work if it's on a remote volume)
        NSError * localError;
        if (![[NSFileManager defaultManager] removeItemAtPath: path error: &localError])
        {
            NSLog(@"old Could not trash %@: %@", path, [localError localizedDescription]);
            if (error != nil)
                *error = localError;
            return NO;
        }
        else
        {
            NSLog(@"old removed %@", path);
        }
    }

    return YES;
}

- (void) moveTorrentDataFileTo: (NSString *) folder
{
    NSString * oldFolder = [self currentDirectory];
    if ([oldFolder isEqualToString: folder])
        return;

    //check if moving inside itself
    NSArray * oldComponents = [oldFolder pathComponents],
            * newComponents = [folder pathComponents];
    const NSUInteger oldCount = [oldComponents count];

    if (oldCount < [newComponents count] && [newComponents[oldCount] isEqualToString: [self name]]
        && [folder hasPrefix: oldFolder])
    {
        NSAlert * alert = [[NSAlert alloc] init];
        [alert setMessageText: NSLocalizedString(@"A folder cannot be moved to inside itself.",
                                                    "Move inside itself alert -> title")];
        [alert setInformativeText: [NSString stringWithFormat:
                        NSLocalizedString(@"The move operation of \"%@\" cannot be done.",
                                            "Move inside itself alert -> message"), [self name]]];
        [alert addButtonWithTitle: NSLocalizedString(@"OK", "Move inside itself alert -> button")];

        [alert runModal];

        return;
    }

    volatile int status;
    tr_torrentSetLocation(fHandle, [folder UTF8String], YES, NULL, &status);

    while (status == TR_LOC_MOVING) //block while moving (for now)
        [NSThread sleepForTimeInterval: 0.05];

    if (status == TR_LOC_DONE)
        [[NSNotificationCenter defaultCenter] postNotificationName: @"UpdateStats" object: nil];
    else
    {
        NSAlert * alert = [[NSAlert alloc] init];
        [alert setMessageText: NSLocalizedString(@"There was an error moving the data file.", "Move error alert -> title")];
        [alert setInformativeText: [NSString stringWithFormat:
                NSLocalizedString(@"The move operation of \"%@\" cannot be done.", "Move error alert -> message"), [self name]]];
        [alert addButtonWithTitle: NSLocalizedString(@"OK", "Move error alert -> button")];

        [alert runModal];
    }

    [self updateTimeMachineExclude];
}

- (void) copyTorrentFileTo: (NSString *) path
{
    [[NSFileManager defaultManager] copyItemAtPath: [self torrentLocation] toPath: path error: NULL];
}

- (BOOL) alertForRemainingDiskSpace
{
    if ([self allDownloaded] || ![fDefaults boolForKey: @"WarningRemainingSpace"])
        return YES;

    NSString * downloadFolder = [self currentDirectory];
    NSDictionary * systemAttributes;
    if ((systemAttributes = [[NSFileManager defaultManager] attributesOfFileSystemForPath: downloadFolder error: NULL]))
    {
        const uint64_t remainingSpace = [systemAttributes[NSFileSystemFreeSize] unsignedLongLongValue];

        //if the remaining space is greater than the size left, then there is enough space regardless of preallocation
        if (remainingSpace < [self sizeLeft] && remainingSpace < tr_torrentGetBytesLeftToAllocate(fHandle))
        {
            NSString * volumeName = [[NSFileManager defaultManager] componentsToDisplayForPath: downloadFolder][0];

            NSAlert * alert = [[NSAlert alloc] init];
            [alert setMessageText: [NSString stringWithFormat:
                                    NSLocalizedString(@"Not enough remaining disk space to download \"%@\" completely.",
                                        "Torrent disk space alert -> title"), [self name]]];
            [alert setInformativeText: [NSString stringWithFormat: NSLocalizedString(@"The transfer will be paused."
                                        " Clear up space on %@ or deselect files in the torrent inspector to continue.",
                                        "Torrent disk space alert -> message"), volumeName]];
            [alert addButtonWithTitle: NSLocalizedString(@"OK", "Torrent disk space alert -> button")];
            [alert addButtonWithTitle: NSLocalizedString(@"Download Anyway", "Torrent disk space alert -> button")];

            [alert setShowsSuppressionButton: YES];
            [[alert suppressionButton] setTitle: NSLocalizedString(@"Do not check disk space again",
                                                    "Torrent disk space alert -> button")];

            const NSInteger result = [alert runModal];
            if ([[alert suppressionButton] state] == NSOnState)
                [fDefaults setBool: NO forKey: @"WarningRemainingSpace"];

            return result != NSAlertFirstButtonReturn;
        }
    }
    return YES;
}

- (NSImage *) icon
{
    if ([self isMagnet])
        return [NSImage imageNamed: @"Magnet"];

    if (!fIcon)
        fIcon = [self isFolder] ? [NSImage imageNamed: NSImageNameFolder]
                                : [[NSWorkspace sharedWorkspace] iconForFileType: [[self name] pathExtension]];
    return fIcon;
}

- (NSString *) name
{
    return fInfo->name != NULL ? @(fInfo->name) : fHashString;
}

- (BOOL) isFolder
{
    return fInfo->isFolder;
}

- (uint64_t) size
{
    return fInfo->totalSize;
}

- (uint64_t) sizeLeft
{
    return fStat->leftUntilDone;
}

- (NSMutableArray *) allTrackerStats
{
    int count;
    tr_tracker_stat * stats = tr_torrentTrackers(fHandle, &count);

    NSMutableArray * trackers = [NSMutableArray arrayWithCapacity: (count > 0 ? count + (stats[count-1].tier + 1) : 0)];

    int prevTier = -1;
    for (int i=0; i < count; ++i)
    {
        if (stats[i].tier != prevTier)
        {
            [trackers addObject: @{ @"Tier" : @(stats[i].tier + 1), @"Name" : [self name] }];
            prevTier = stats[i].tier;
        }

        TrackerNode * tracker = [[TrackerNode alloc] initWithTrackerStat: &stats[i] torrent: self];
        [trackers addObject: tracker];
    }

    tr_torrentTrackersFree(stats, count);
    return trackers;
}

- (NSArray *) allTrackersFlat
{
    NSMutableArray * allTrackers = [NSMutableArray arrayWithCapacity: fInfo->trackerCount];

    for (NSInteger i=0; i < fInfo->trackerCount; i++)
        [allTrackers addObject: @(fInfo->trackers[i].announce)];

    return allTrackers;
}

- (BOOL) addTrackerToNewTier: (NSString *) tracker
{
    tracker = [tracker stringByTrimmingCharactersInSet: [NSCharacterSet whitespaceAndNewlineCharacterSet]];

    if ([tracker rangeOfString: @"://"].location == NSNotFound)
        tracker = [@"http://" stringByAppendingString: tracker];

    //recreate the tracker structure
    const int oldTrackerCount = fInfo->trackerCount;
    tr_tracker_info * trackerStructs = tr_new(tr_tracker_info, oldTrackerCount+1);
    for (int i = 0; i < oldTrackerCount; ++i)
        trackerStructs[i] = fInfo->trackers[i];

    trackerStructs[oldTrackerCount].announce = (char *)[tracker UTF8String];
    trackerStructs[oldTrackerCount].tier = trackerStructs[oldTrackerCount-1].tier + 1;
    trackerStructs[oldTrackerCount].id = oldTrackerCount;

    const BOOL success = tr_torrentSetAnnounceList(fHandle, trackerStructs, oldTrackerCount+1);
    tr_free(trackerStructs);

    return success;
}

- (void) removeTrackers: (NSSet *) trackers
{
    //recreate the tracker structure
    tr_tracker_info * trackerStructs = tr_new(tr_tracker_info, fInfo->trackerCount);

    NSUInteger newCount = 0;
    for (NSUInteger i = 0; i < fInfo->trackerCount; i++)
    {
        if (![trackers containsObject: @(fInfo->trackers[i].announce)])
            trackerStructs[newCount++] = fInfo->trackers[i];
    }

    const BOOL success = tr_torrentSetAnnounceList(fHandle, trackerStructs, newCount);
    NSAssert(success, @"Removing tracker addresses failed");

    tr_free(trackerStructs);
}

- (NSString *) comment
{
    return fInfo->comment ? @(fInfo->comment) : @"";
}

- (NSString *) creator
{
    return fInfo->creator ? @(fInfo->creator) : @"";
}

- (NSDate *) dateCreated
{
    NSInteger date = fInfo->dateCreated;
    return date > 0 ? [NSDate dateWithTimeIntervalSince1970: date] : nil;
}

- (NSInteger) pieceSize
{
    return fInfo->pieceSize;
}

- (NSInteger) pieceCount
{
    return fInfo->pieceCount;
}

- (NSString *) hashString
{
    return fHashString;
}

- (BOOL) privateTorrent
{
    return fInfo->isPrivate;
}

- (NSString *) torrentLocation
{
    return fInfo->torrent ? @(fInfo->torrent) : @"";
}

- (NSString *) dataLocation
{
    if ([self isMagnet])
        return nil;

    if ([self isFolder])
    {
        NSString * dataLocation = [[self currentDirectory] stringByAppendingPathComponent: [self name]];

        if (![[NSFileManager defaultManager] fileExistsAtPath: dataLocation])
            return nil;

        return dataLocation;
    }
    else
    {
        char * location = tr_torrentFindFile(fHandle, 0);
        if (location == NULL)
            return nil;

        NSString * dataLocation = @(location);
        free(location);

        return dataLocation;
    }
}

- (NSString *) fileLocation: (FileListNode *) node
{
    if ([node isFolder])
    {
        NSString * basePath = [[node path] stringByAppendingPathComponent: [node name]];
        NSString * dataLocation = [[self currentDirectory] stringByAppendingPathComponent: basePath];

        if (![[NSFileManager defaultManager] fileExistsAtPath: dataLocation])
            return nil;

        return dataLocation;
    }
    else
    {
        char * location = tr_torrentFindFile(fHandle, [[node indexes] firstIndex]);
        if (location == NULL)
            return nil;

        NSString * dataLocation = @(location);
        free(location);

        return dataLocation;
    }
}

- (void) renameTorrent: (NSString *) newName completionHandler: (void (^)(BOOL didRename)) completionHandler
{
    NSParameterAssert(newName != nil);
    NSParameterAssert(![newName isEqualToString: @""]);

    NSDictionary * contextInfo = @{ @"Torrent" : self, @"CompletionHandler" : [completionHandler copy] };

    tr_torrentRenamePath(fHandle, fInfo->name, [newName UTF8String], renameCallback, (__bridge_retained void *)(contextInfo));
}

- (void) renameFileNode: (FileListNode *) node withName: (NSString *) newName completionHandler: (void (^)(BOOL didRename)) completionHandler
{
    NSParameterAssert([node torrent] == self);
    NSParameterAssert(newName != nil);
    NSParameterAssert(![newName isEqualToString: @""]);

    NSDictionary * contextInfo = @{ @"Torrent" : self, @"Nodes" : @[ node ], @"CompletionHandler" : [completionHandler copy] };

    NSString * oldPath = [[node path] stringByAppendingPathComponent: [node name]];
    tr_torrentRenamePath(fHandle, [oldPath UTF8String], [newName UTF8String], renameCallback, (__bridge_retained void *)(contextInfo));
}

- (CGFloat) progress
{
    return fStat->percentComplete;
}

- (CGFloat) progressDone
{
    return fStat->percentDone;
}

- (CGFloat) progressLeft
{
    if ([self size] == 0) //magnet links
        return 0.0;

    return (CGFloat)[self sizeLeft] / [self size];
}

- (CGFloat) checkingProgress
{
    return fStat->recheckProgress;
}

- (CGFloat) availableDesired
{
    return (CGFloat)fStat->desiredAvailable / [self sizeLeft];
}

- (BOOL) isActive
{
    return fStat->activity != TR_STATUS_STOPPED && fStat->activity != TR_STATUS_DOWNLOAD_WAIT && fStat->activity != TR_STATUS_SEED_WAIT;
}

- (BOOL) isSeeding
{
    return fStat->activity == TR_STATUS_SEED;
}

- (BOOL) isChecking
{
    return fStat->activity == TR_STATUS_CHECK || fStat->activity == TR_STATUS_CHECK_WAIT;
}

- (BOOL) isCheckingWaiting
{
    return fStat->activity == TR_STATUS_CHECK_WAIT;
}

- (BOOL) allDownloaded
{
    return [self sizeLeft] == 0 && ![self isMagnet];
}

- (BOOL) isComplete
{
    return [self progress] >= 1.0;
}

- (BOOL) isFinishedSeeding
{
    return fStat->finished;
}

- (BOOL) isError
{
    return fStat->error == TR_STAT_LOCAL_ERROR;
}

- (BOOL) isAnyErrorOrWarning
{
    return fStat->error != TR_STAT_OK;
}

- (NSString *) errorMessage
{
    if (![self isAnyErrorOrWarning])
        return @"";

    NSString * error;
    if (!(error = @(fStat->errorString))
        && !(error = [NSString stringWithCString: fStat->errorString encoding: NSISOLatin1StringEncoding]))
        error = [NSString stringWithFormat: @"(%@)", NSLocalizedString(@"unreadable error", "Torrent -> error string unreadable")];

    //libtransmission uses "Set Location", Mac client uses "Move data file to..." - very hacky!
    error = [error stringByReplacingOccurrencesOfString: @"Set Location" withString: [@"Move Data File To" stringByAppendingEllipsis]];

    return error;
}

- (NSArray *) peers
{
    int totalPeers;
    tr_peer_stat * peers = tr_torrentPeers(fHandle, &totalPeers);

    NSMutableArray * peerDicts = [NSMutableArray arrayWithCapacity: totalPeers];

    for (int i = 0; i < totalPeers; i++)
    {
        tr_peer_stat * peer = &peers[i];
        NSMutableDictionary * dict = [NSMutableDictionary dictionaryWithCapacity: 12];

        dict[@"Name"] = [self name];
        dict[@"From"] = @(peer->from);
        dict[@"IP"] = @(peer->addr);
        dict[@"Port"] = @(peer->port);
        dict[@"Progress"] = @(peer->progress);
        dict[@"Seed"] = @(peer->isSeed);
        dict[@"Encryption"] = @(peer->isEncrypted);
        dict[@"uTP"] = @(peer->isUTP);
        dict[@"Client"] = @(peer->client);
        dict[@"Flags"] = @(peer->flagStr);

        if (peer->isUploadingTo)
            dict[@"UL To Rate"] = @(peer->rateToPeer_KBps);
        if (peer->isDownloadingFrom)
            dict[@"DL From Rate"] = @(peer->rateToClient_KBps);

        [peerDicts addObject: dict];
    }

    tr_torrentPeersFree(peers, totalPeers);

    return peerDicts;
}

- (NSUInteger) webSeedCount
{
    return fInfo->webseedCount;
}

- (NSArray *) webSeeds
{
    NSMutableArray * webSeeds = [NSMutableArray arrayWithCapacity: fInfo->webseedCount];

    double * dlSpeeds = tr_torrentWebSpeeds_KBps(fHandle);

    for (NSInteger i = 0; i < fInfo->webseedCount; i++)
    {
        NSMutableDictionary * dict = [NSMutableDictionary dictionaryWithCapacity: 3];

        dict[@"Name"] = [self name];
        dict[@"Address"] = @(fInfo->webseeds[i]);

        if (dlSpeeds[i] != -1.0)
            dict[@"DL From Rate"] = @(dlSpeeds[i]);

        [webSeeds addObject: dict];
    }

    tr_free(dlSpeeds);

    return webSeeds;
}

- (NSString *) progressString
{
    if ([self isMagnet])
    {
        NSString * progressString = fStat->metadataPercentComplete > 0.0
                    ? [NSString stringWithFormat: NSLocalizedString(@"%@ of torrent metadata retrieved",
                        "Torrent -> progress string"), [NSString percentString: fStat->metadataPercentComplete longDecimals: YES]]
                    : NSLocalizedString(@"torrent metadata needed", "Torrent -> progress string");

        return [NSString stringWithFormat: @"%@ - %@", NSLocalizedString(@"Magnetized transfer", "Torrent -> progress string"),
                                            progressString];
    }

    NSString * string;

    if (![self allDownloaded])
    {
        CGFloat progress;
        if ([self isFolder] && [fDefaults boolForKey: @"DisplayStatusProgressSelected"])
        {
            string = [NSString stringForFilePartialSize: [self haveTotal] fullSize: [self totalSizeSelected]];
            progress = [self progressDone];
        }
        else
        {
            string = [NSString stringForFilePartialSize: [self haveTotal] fullSize: [self size]];
            progress = [self progress];
        }

        string = [string stringByAppendingFormat: @" (%@)", [NSString percentString: progress longDecimals: YES]];
    }
    else
    {
        NSString * downloadString;
        if (![self isComplete]) //only multifile possible
        {
            if ([fDefaults boolForKey: @"DisplayStatusProgressSelected"])
                downloadString = [NSString stringWithFormat: NSLocalizedString(@"%@ selected", "Torrent -> progress string"),
                                    [NSString stringForFileSize: [self haveTotal]]];
            else
            {
                downloadString = [NSString stringForFilePartialSize: [self haveTotal] fullSize: [self size]];
                downloadString = [downloadString stringByAppendingFormat: @" (%@)",
                                    [NSString percentString: [self progress] longDecimals: YES]];
            }
        }
        else
            downloadString = [NSString stringForFileSize: [self size]];

        NSString * uploadString = [NSString stringWithFormat: NSLocalizedString(@"uploaded %@ (Ratio: %@)",
                                    "Torrent -> progress string"), [NSString stringForFileSize: [self uploadedTotal]],
                                    [NSString stringForRatio: [self ratio]]];

        string = [downloadString stringByAppendingFormat: @", %@", uploadString];
    }

    //add time when downloading or seed limit set
    if ([self shouldShowEta])
        string = [string stringByAppendingFormat: @" - %@", [self etaString]];

    return string;
}

- (NSString *) statusString
{
    NSString * string;

    if ([self isAnyErrorOrWarning])
    {
        switch (fStat->error)
        {
            case TR_STAT_LOCAL_ERROR: string = NSLocalizedString(@"Error", "Torrent -> status string"); break;
            case TR_STAT_TRACKER_ERROR: string = NSLocalizedString(@"Tracker returned error", "Torrent -> status string"); break;
            case TR_STAT_TRACKER_WARNING: string = NSLocalizedString(@"Tracker returned warning", "Torrent -> status string"); break;
            default: NSAssert(NO, @"unknown error state");
        }

        NSString * errorString = [self errorMessage];
        if (errorString && ![errorString isEqualToString: @""])
            string = [string stringByAppendingFormat: @": %@", errorString];
    }
    else
    {
        switch (fStat->activity)
        {
            case TR_STATUS_STOPPED:
                if ([self isFinishedSeeding])
                    string = NSLocalizedString(@"Seeding complete", "Torrent -> status string");
                else
                    string = NSLocalizedString(@"Paused", "Torrent -> status string");
                break;

            case TR_STATUS_DOWNLOAD_WAIT:
                string = [NSLocalizedString(@"Waiting to download", "Torrent -> status string") stringByAppendingEllipsis];
                break;

            case TR_STATUS_SEED_WAIT:
                string = [NSLocalizedString(@"Waiting to seed", "Torrent -> status string") stringByAppendingEllipsis];
                break;

            case TR_STATUS_CHECK_WAIT:
                string = [NSLocalizedString(@"Waiting to check existing data", "Torrent -> status string") stringByAppendingEllipsis];
                break;

            case TR_STATUS_CHECK:
                string = [NSString stringWithFormat: @"%@ (%@)",
                            NSLocalizedString(@"Checking existing data", "Torrent -> status string"),
                            [NSString percentString: [self checkingProgress] longDecimals: YES]];
                break;

            case TR_STATUS_DOWNLOAD:
                if ([self totalPeersConnected] != 1)
                    string = [NSString stringWithFormat: NSLocalizedString(@"Downloading from %d of %d peers",
                                                    "Torrent -> status string"), [self peersSendingToUs], [self totalPeersConnected]];
                else
                    string = [NSString stringWithFormat: NSLocalizedString(@"Downloading from %d of 1 peer",
                                                    "Torrent -> status string"), [self peersSendingToUs]];

                const NSInteger webSeedCount = fStat->webseedsSendingToUs;
                if (webSeedCount > 0)
                {
                    NSString * webSeedString;
                    if (webSeedCount == 1)
                        webSeedString = NSLocalizedString(@"web seed", "Torrent -> status string");
                    else
                        webSeedString = [NSString stringWithFormat: NSLocalizedString(@"%d web seeds", "Torrent -> status string"),
                                                                    webSeedCount];

                    string = [string stringByAppendingFormat: @" + %@", webSeedString];
                }

                break;

            case TR_STATUS_SEED:
                if ([self totalPeersConnected] != 1)
                    string = [NSString stringWithFormat: NSLocalizedString(@"Seeding to %d of %d peers", "Torrent -> status string"),
                                                    [self peersGettingFromUs], [self totalPeersConnected]];
                else
                    string = [NSString stringWithFormat: NSLocalizedString(@"Seeding to %d of 1 peer", "Torrent -> status string"),
                                                    [self peersGettingFromUs]];
        }

        if ([self isStalled])
            string = [NSLocalizedString(@"Stalled", "Torrent -> status string") stringByAppendingFormat: @", %@", string];
    }

    //append even if error
    if ([self isActive] && ![self isChecking])
    {
        if (fStat->activity == TR_STATUS_DOWNLOAD)
            string = [string stringByAppendingFormat: @" - %@: %@, %@: %@",
                        NSLocalizedString(@"DL", "Torrent -> status string"), [NSString stringForSpeed: [self downloadRate]],
                        NSLocalizedString(@"UL", "Torrent -> status string"), [NSString stringForSpeed: [self uploadRate]]];
        else
            string = [string stringByAppendingFormat: @" - %@: %@",
                        NSLocalizedString(@"UL", "Torrent -> status string"), [NSString stringForSpeed: [self uploadRate]]];
    }

    return string;
}

- (NSString *) shortStatusString
{
    NSString * string;

    switch (fStat->activity)
    {
        case TR_STATUS_STOPPED:
            if ([self isFinishedSeeding])
                string = NSLocalizedString(@"Seeding complete", "Torrent -> status string");
            else
                string = NSLocalizedString(@"Paused", "Torrent -> status string");
            break;

        case TR_STATUS_DOWNLOAD_WAIT:
            string = [NSLocalizedString(@"Waiting to download", "Torrent -> status string") stringByAppendingEllipsis];
            break;

        case TR_STATUS_SEED_WAIT:
            string = [NSLocalizedString(@"Waiting to seed", "Torrent -> status string") stringByAppendingEllipsis];
            break;

        case TR_STATUS_CHECK_WAIT:
            string = [NSLocalizedString(@"Waiting to check existing data", "Torrent -> status string") stringByAppendingEllipsis];
            break;

        case TR_STATUS_CHECK:
            string = [NSString stringWithFormat: @"%@ (%@)",
                        NSLocalizedString(@"Checking existing data", "Torrent -> status string"),
                        [NSString percentString: [self checkingProgress] longDecimals: YES]];
            break;

        case TR_STATUS_DOWNLOAD:
            string = [NSString stringWithFormat: @"%@: %@, %@: %@",
                            NSLocalizedString(@"DL", "Torrent -> status string"), [NSString stringForSpeed: [self downloadRate]],
                            NSLocalizedString(@"UL", "Torrent -> status string"), [NSString stringForSpeed: [self uploadRate]]];
            break;

        case TR_STATUS_SEED:
            string = [NSString stringWithFormat: @"%@: %@, %@: %@",
                            NSLocalizedString(@"Ratio", "Torrent -> status string"), [NSString stringForRatio: [self ratio]],
                            NSLocalizedString(@"UL", "Torrent -> status string"), [NSString stringForSpeed: [self uploadRate]]];
    }

    return string;
}

- (NSString *) remainingTimeString
{
    if ([self shouldShowEta])
        return [self etaString];
    else
        return [self shortStatusString];
}

- (NSString *) stateString
{
    switch (fStat->activity)
    {
        case TR_STATUS_STOPPED:
        case TR_STATUS_DOWNLOAD_WAIT:
        case TR_STATUS_SEED_WAIT:
        {
            NSString * string = NSLocalizedString(@"Paused", "Torrent -> status string");

            NSString * extra = nil;
            if ([self waitingToStart])
            {
                extra = fStat->activity == TR_STATUS_DOWNLOAD_WAIT
                        ? NSLocalizedString(@"Waiting to download", "Torrent -> status string")
                        : NSLocalizedString(@"Waiting to seed", "Torrent -> status string");
            }
            else if ([self isFinishedSeeding])
                extra = NSLocalizedString(@"Seeding complete", "Torrent -> status string");
            else;

            return extra ? [string stringByAppendingFormat: @" (%@)", extra] : string;
        }

        case TR_STATUS_CHECK_WAIT:
            return [NSLocalizedString(@"Waiting to check existing data", "Torrent -> status string") stringByAppendingEllipsis];

        case TR_STATUS_CHECK:
            return [NSString stringWithFormat: @"%@ (%@)",
                    NSLocalizedString(@"Checking existing data", "Torrent -> status string"),
                    [NSString percentString: [self checkingProgress] longDecimals: YES]];

        case TR_STATUS_DOWNLOAD:
            return NSLocalizedString(@"Downloading", "Torrent -> status string");

        case TR_STATUS_SEED:
            return NSLocalizedString(@"Seeding", "Torrent -> status string");
    }
}

- (NSInteger) totalPeersConnected
{
    return fStat->peersConnected;
}

- (NSInteger) totalPeersTracker
{
    return fStat->peersFrom[TR_PEER_FROM_TRACKER];
}

- (NSInteger) totalPeersIncoming
{
    return fStat->peersFrom[TR_PEER_FROM_INCOMING];
}

- (NSInteger) totalPeersCache
{
    return fStat->peersFrom[TR_PEER_FROM_RESUME];
}

- (NSInteger) totalPeersPex
{
    return fStat->peersFrom[TR_PEER_FROM_PEX];
}

- (NSInteger) totalPeersDHT
{
    return fStat->peersFrom[TR_PEER_FROM_DHT];
}

- (NSInteger) totalPeersLocal
{
    return fStat->peersFrom[TR_PEER_FROM_LPD];
}

- (NSInteger) totalPeersLTEP
{
    return fStat->peersFrom[TR_PEER_FROM_LTEP];
}

- (NSInteger) peersSendingToUs
{
    return fStat->peersSendingToUs;
}

- (NSInteger) peersGettingFromUs
{
    return fStat->peersGettingFromUs;
}

- (CGFloat) downloadRate
{
    return fStat->pieceDownloadSpeed_KBps;
}

- (CGFloat) uploadRate
{
    return fStat->pieceUploadSpeed_KBps;
}

- (CGFloat) totalRate
{
    return [self downloadRate] + [self uploadRate];
}

- (uint64_t) haveVerified
{
    return fStat->haveValid;
}

- (uint64_t) haveTotal
{
    return [self haveVerified] + fStat->haveUnchecked;
}

- (uint64_t) totalSizeSelected
{
    return fStat->sizeWhenDone;
}

- (uint64_t) downloadedTotal
{
    return fStat->downloadedEver;
}

- (uint64_t) uploadedTotal
{
    return fStat->uploadedEver;
}

- (uint64_t) failedHash
{
    return fStat->corruptEver;
}

- (NSInteger) groupValue
{
    return fGroupValue;
}

- (void) setGroupValue: (NSInteger) groupValue determinationType: (TorrentDeterminationType) determinationType
{
    if (groupValue != fGroupValue)
    {
        fGroupValue = groupValue;
        [[NSNotificationCenter defaultCenter] postNotificationName: kTorrentDidChangeGroupNotification object: self];
    }
    fGroupValueDetermination = determinationType;
}

- (NSInteger) groupOrderValue
{
    return [[GroupsController groups] rowValueForIndex: fGroupValue];
}

- (void) checkGroupValueForRemoval: (NSNotification *) notification
{
    if (fGroupValue != -1 && [[notification userInfo][@"Index"] integerValue] == fGroupValue)
        fGroupValue = -1;
}

- (NSArray *) fileList
{
    return fFileList;
}

- (NSArray *) flatFileList
{
    return fFlatFileList;
}

- (NSInteger) fileCount
{
    return fInfo->fileCount;
}

- (void) updateFileStat
{
    if (fFileStat)
        tr_torrentFilesFree(fFileStat, [self fileCount]);

    fFileStat = tr_torrentFiles(fHandle, NULL);
}

- (CGFloat) fileProgress: (FileListNode *) node
{
    if ([self fileCount] == 1 || [self isComplete])
        return [self progress];

    if (!fFileStat)
        [self updateFileStat];

    // #5501
    if ([node size] == 0) {
        return 1.0;
    }

    NSIndexSet * indexSet = [node indexes];

    if ([indexSet count] == 1)
        return fFileStat[[indexSet firstIndex]].progress;

    uint64_t have = 0;
    for (NSInteger index = [indexSet firstIndex]; index != NSNotFound; index = [indexSet indexGreaterThanIndex: index])
        have += fFileStat[index].bytesCompleted;

    return (CGFloat)have / [node size];
}

- (BOOL) canChangeDownloadCheckForFile: (NSUInteger) index
{
    NSAssert2((NSInteger)index < [self fileCount], @"Index %ld is greater than file count %ld", index, [self fileCount]);

    return [self canChangeDownloadCheckForFiles: [NSIndexSet indexSetWithIndex: index]];
}

- (BOOL) canChangeDownloadCheckForFiles: (NSIndexSet *) indexSet
{
    if ([self fileCount] == 1 || [self isComplete])
        return NO;

    if (!fFileStat)
        [self updateFileStat];

    __block BOOL canChange = NO;
    [indexSet enumerateIndexesWithOptions: NSEnumerationConcurrent usingBlock: ^(NSUInteger index, BOOL *stop) {
        if (fFileStat[index].progress < 1.0)
        {
            canChange = YES;
            *stop = YES;
        }
    }];
    return canChange;
}

- (NSInteger) checkForFiles: (NSIndexSet *) indexSet
{
    BOOL onState = NO, offState = NO;
    for (NSUInteger index = [indexSet firstIndex]; index != NSNotFound; index = [indexSet indexGreaterThanIndex: index])
    {
        if (!fInfo->files[index].dnd || ![self canChangeDownloadCheckForFile: index])
            onState = YES;
        else
            offState = YES;

        if (onState && offState)
            return NSMixedState;
    }
    return onState ? NSOnState : NSOffState;
}

- (void) setFileCheckState: (NSInteger) state forIndexes: (NSIndexSet *) indexSet
{
    NSUInteger count = [indexSet count];
    tr_file_index_t * files = malloc(count * sizeof(tr_file_index_t));
    for (NSUInteger index = [indexSet firstIndex], i = 0; index != NSNotFound; index = [indexSet indexGreaterThanIndex: index], i++)
        files[i] = index;

    tr_torrentSetFileDLs(fHandle, files, count, state != NSOffState);
    free(files);

    [self update];
    [[NSNotificationCenter defaultCenter] postNotificationName: @"TorrentFileCheckChange" object: self];
}

- (void) setFilePriority: (tr_priority_t) priority forIndexes: (NSIndexSet *) indexSet
{
    const NSUInteger count = [indexSet count];
    tr_file_index_t * files = tr_malloc(count * sizeof(tr_file_index_t));
    for (NSUInteger index = [indexSet firstIndex], i = 0; index != NSNotFound; index = [indexSet indexGreaterThanIndex: index], i++)
        files[i] = index;

    tr_torrentSetFilePriorities(fHandle, files, count, priority);
    tr_free(files);
}

- (BOOL) hasFilePriority: (tr_priority_t) priority forIndexes: (NSIndexSet *) indexSet
{
    for (NSUInteger index = [indexSet firstIndex]; index != NSNotFound; index = [indexSet indexGreaterThanIndex: index])
        if (priority == fInfo->files[index].priority && [self canChangeDownloadCheckForFile: index])
            return YES;
    return NO;
}

- (NSSet *) filePrioritiesForIndexes: (NSIndexSet *) indexSet
{
    BOOL low = NO, normal = NO, high = NO;
    NSMutableSet * priorities = [NSMutableSet setWithCapacity: MIN([indexSet count], 3u)];

    for (NSUInteger index = [indexSet firstIndex]; index != NSNotFound; index = [indexSet indexGreaterThanIndex: index])
    {
        if (![self canChangeDownloadCheckForFile: index])
            continue;

        const tr_priority_t priority = fInfo->files[index].priority;
        switch (priority)
        {
            case TR_PRI_LOW:
                if (low)
                    continue;
                low = YES;
                break;
            case TR_PRI_NORMAL:
                if (normal)
                    continue;
                normal = YES;
                break;
            case TR_PRI_HIGH:
                if (high)
                    continue;
                high = YES;
                break;
            default:
                NSAssert2(NO, @"Unknown priority %d for file index %ld", priority, index);
        }

        [priorities addObject: @(priority)];
        if (low && normal && high)
            break;
    }
    return priorities;
}

- (NSDate *) dateAdded
{
    const time_t date = fStat->addedDate;
    return [NSDate dateWithTimeIntervalSince1970: date];
}

- (NSDate *) dateCompleted
{
    const time_t date = fStat->doneDate;
    return date != 0 ? [NSDate dateWithTimeIntervalSince1970: date] : nil;
}

- (NSDate *) dateActivity
{
    const time_t date = fStat->activityDate;
    return date != 0 ? [NSDate dateWithTimeIntervalSince1970: date] : nil;
}

- (NSDate *) dateActivityOrAdd
{
    NSDate * date = [self dateActivity];
    return date ? date : [self dateAdded];
}

- (NSInteger) secondsDownloading
{
    return fStat->secondsDownloading;
}

- (NSInteger) secondsSeeding
{
    return fStat->secondsSeeding;
}

- (NSInteger) stalledMinutes
{
    if (fStat->idleSecs == -1)
        return -1;

    return fStat->idleSecs / 60;
}

- (BOOL) isStalled
{
    return fStat->isStalled;
}

- (void) updateTimeMachineExclude
{
    [self setTimeMachineExclude: ![self allDownloaded]];
}

- (NSInteger) stateSortKey
{
    if (![self isActive]) //paused
    {
        if ([self waitingToStart])
            return 1;
        else
            return 0;
    }
    else if ([self isSeeding]) //seeding
        return 10;
    else //downloading
        return 20;
}

- (NSString *) trackerSortKey
{
    int count;
    tr_tracker_stat * stats = tr_torrentTrackers(fHandle, &count);

    NSString * best = nil;

    for (int i=0; i < count; ++i)
    {
        NSString * tracker = @(stats[i].host);
        if (!best || [tracker localizedCaseInsensitiveCompare: best] == NSOrderedAscending)
            best = tracker;
    }

    tr_torrentTrackersFree(stats, count);
    return best;
}

- (tr_torrent *) torrentStruct
{
    return fHandle;
}

- (NSURL *) previewItemURL
{
    NSString * location = [self dataLocation];
    return location ? [NSURL fileURLWithPath: location] : nil;
}

@end

@implementation Torrent (Private)

- (id) initWithPath: (NSString *) path hash: (NSString *) hashString torrentStruct: (tr_torrent *) torrentStruct
        magnetAddress: (NSString *) magnetAddress lib: (tr_session *) lib
        groupValue: (NSNumber *) groupValue
        removeWhenFinishSeeding: (NSNumber *) removeWhenFinishSeeding
        downloadFolder: (NSString *) downloadFolder
        legacyIncompleteFolder: (NSString *) incompleteFolder
{
    if (!(self = [super init]))
        return nil;

    fDefaults = [NSUserDefaults standardUserDefaults];

    if (torrentStruct)
        fHandle = torrentStruct;
    else
    {
        //set libtransmission settings for initialization
        tr_ctor * ctor = tr_ctorNew(lib);

        tr_ctorSetPaused(ctor, TR_FORCE, YES);
        if (downloadFolder)
            tr_ctorSetDownloadDir(ctor, TR_FORCE, [downloadFolder UTF8String]);
        if (incompleteFolder)
            tr_ctorSetIncompleteDir(ctor, [incompleteFolder UTF8String]);

        tr_parse_result result = TR_PARSE_ERR;
        if (path)
            result = tr_ctorSetMetainfoFromFile(ctor, [path UTF8String]);

        if (result != TR_PARSE_OK && magnetAddress)
            result = tr_ctorSetMetainfoFromMagnetLink(ctor, [magnetAddress UTF8String]);

        //backup - shouldn't be needed after upgrade to 1.70
        if (result != TR_PARSE_OK && hashString)
            result = tr_ctorSetMetainfoFromHash(ctor, [hashString UTF8String]);

        if (result == TR_PARSE_OK)
            fHandle = tr_torrentNew(ctor, NULL, NULL);

        tr_ctorFree(ctor);

        if (!fHandle)
        {
            return nil;
        }
    }

    fInfo = tr_torrentInfo(fHandle);

    tr_torrentSetQueueStartCallback(fHandle, startQueueCallback, (__bridge void *)(self));
    tr_torrentSetCompletenessCallback(fHandle, completenessChangeCallback, (__bridge void *)(self));
    tr_torrentSetRatioLimitHitCallback(fHandle, ratioLimitHitCallback, (__bridge void *)(self));
    tr_torrentSetIdleLimitHitCallback(fHandle, idleLimitHitCallback, (__bridge void *)(self));
    tr_torrentSetMetadataCallback(fHandle, metadataCallback, (__bridge void *)(self));

    fHashString = [[NSString alloc] initWithUTF8String: fInfo->hashString];

    fResumeOnWake = NO;

    //don't do after this point - it messes with auto-group functionality
    if (![self isMagnet])
        [self createFileList];

    fDownloadFolderDetermination = TorrentDeterminationAutomatic;

    if (groupValue)
    {
        fGroupValueDetermination = TorrentDeterminationUserSpecified;
        fGroupValue = [groupValue intValue];
    }
    else
    {
        fGroupValueDetermination = TorrentDeterminationAutomatic;
        fGroupValue = [[GroupsController groups] groupIndexForTorrent: self];
    }

    _removeWhenFinishSeeding = removeWhenFinishSeeding ? [removeWhenFinishSeeding boolValue] : [fDefaults boolForKey: @"RemoveWhenFinishSeeding"];

    [[NSNotificationCenter defaultCenter] addObserver: self selector: @selector(checkGroupValueForRemoval:)
        name: @"GroupValueRemoved" object: nil];

    fTimeMachineExcludeInitialized = NO;
    [self update];

    return self;
}

- (void) createFileList
{
    NSAssert(![self isMagnet], @"Cannot create a file list until the torrent is demagnetized");

    if ([self isFolder])
    {
        const NSInteger count = [self fileCount];
        NSMutableArray * flatFileList = [NSMutableArray arrayWithCapacity: count];

        FileListNode * tempNode = nil;

        for (NSInteger i = 0; i < count; i++)
        {
            tr_file * file = &fInfo->files[i];

            NSString * fullPath = @(file->name);
            NSArray * pathComponents = [fullPath pathComponents];

            if (!tempNode)
                tempNode = [[FileListNode alloc] initWithFolderName:pathComponents[0] path:@"" torrent:self];

            [self insertPathForComponents: pathComponents withComponentIndex: 1 forParent: tempNode fileSize: file->length index: i flatList: flatFileList];
        }

        [self sortFileList: [tempNode children]];
        [self sortFileList: flatFileList];

        fFileList = [[NSArray alloc] initWithArray: [tempNode children]];
        fFlatFileList = [[NSArray alloc] initWithArray: flatFileList];
    }
    else
    {
        FileListNode * node = [[FileListNode alloc] initWithFileName: [self name] path: @"" size: [self size] index: 0 torrent: self];
        fFileList = @[node];
        fFlatFileList = fFileList;
    }
}

- (void) insertPathForComponents: (NSArray *) components withComponentIndex: (NSUInteger) componentIndex forParent: (FileListNode *) parent fileSize: (uint64_t) size
    index: (NSInteger) index flatList: (NSMutableArray *) flatFileList
{
    NSParameterAssert([components count] > 0);
    NSParameterAssert(componentIndex < [components count]);

    NSString * name = components[componentIndex];
    const BOOL isFolder = componentIndex < ([components count]-1);

    //determine if folder node already exists
    __block FileListNode * node = nil;
    if (isFolder)
    {
        [[parent children] enumerateObjectsWithOptions: NSEnumerationConcurrent usingBlock: ^(FileListNode * searchNode, NSUInteger idx, BOOL * stop) {
            if ([[searchNode name] isEqualToString: name] && [searchNode isFolder])
            {
                node = searchNode;
                *stop = YES;
            }
        }];
    }

    //create new folder or file if it doesn't already exist
    if (!node)
    {
        NSString * path = [[parent path] stringByAppendingPathComponent: [parent name]];
        if (isFolder)
            node = [[FileListNode alloc] initWithFolderName: name path: path torrent: self];
        else
        {
            node = [[FileListNode alloc] initWithFileName: name path: path size: size index: index torrent: self];
            [flatFileList addObject: node];
        }

        [parent insertChild: node];
    }

    if (isFolder)
    {
        [node insertIndex: index withSize: size];

        [self insertPathForComponents: components withComponentIndex: (componentIndex+1) forParent: node fileSize: size index: index flatList: flatFileList];
    }
}

- (void) sortFileList: (NSMutableArray *) fileNodes
{
    NSSortDescriptor * descriptor = [NSSortDescriptor sortDescriptorWithKey: @"name" ascending: YES selector: @selector(localizedStandardCompare:)];
    [fileNodes sortUsingDescriptors: @[descriptor]];

    [fileNodes enumerateObjectsWithOptions: NSEnumerationConcurrent usingBlock: ^(FileListNode * node, NSUInteger idx, BOOL * stop) {
        if ([node isFolder])
            [self sortFileList: [node children]];
    }];
}

- (void) startQueue
{
    [[NSNotificationCenter defaultCenter] postNotificationName: @"UpdateQueue" object: self];
}

- (void) completenessChange: (tr_completeness) status wasRunning: (BOOL) wasRunning
{
    fStat = tr_torrentStat(fHandle); //don't call update yet to avoid auto-stop

    switch (status)
    {
        case TR_SEED:
        case TR_PARTIAL_SEED:
        {
            NSDictionary * statusInfo = @{ @"Status" : @(status), @"WasRunning" : @(wasRunning) };
            [[NSNotificationCenter defaultCenter] postNotificationName: @"TorrentFinishedDownloading" object: self userInfo: statusInfo];

            //quarantine the finished data
            NSString * dataLocation = [[self currentDirectory] stringByAppendingPathComponent: [self name]];
            NSURL * dataLocationUrl = [NSURL fileURLWithPath: dataLocation];
            NSDictionary * quarantineProperties = @{ (NSString *)kLSQuarantineTypeKey : (NSString *)kLSQuarantineTypeOtherDownload };
            NSError * error = nil;
            if (![dataLocationUrl setResourceValue: quarantineProperties forKey: NSURLQuarantinePropertiesKey error: &error])
                NSLog(@"Failed to quarantine %@: %@", dataLocation, [error description]);
            break;
        }
        case TR_LEECH:
            [[NSNotificationCenter defaultCenter] postNotificationName: @"TorrentRestartedDownloading" object: self];
            break;
    }

    [self update];
    [self updateTimeMachineExclude];
}

- (void) ratioLimitHit
{
    fStat = tr_torrentStat(fHandle);

    [[NSNotificationCenter defaultCenter] postNotificationName: @"TorrentFinishedSeeding" object: self];
}

- (void) idleLimitHit
{
    fStat = tr_torrentStat(fHandle);

    [[NSNotificationCenter defaultCenter] postNotificationName: @"TorrentFinishedSeeding" object: self];
}

- (void) metadataRetrieved
{
    fStat = tr_torrentStat(fHandle);

    [self createFileList];

    /* If the torrent is in no group, or the group was automatically determined based on criteria evaluated
     * before we had metadata for this torrent, redetermine the group
     */
    if ((fGroupValueDetermination == TorrentDeterminationAutomatic) || ([self groupValue] == -1))
        [self setGroupValue: [[GroupsController groups] groupIndexForTorrent: self] determinationType: TorrentDeterminationAutomatic];

    //change the location if the group calls for it and it's either not already set or was set automatically before
    if (((fDownloadFolderDetermination == TorrentDeterminationAutomatic) || !tr_torrentGetCurrentDir(fHandle)) &&
        [[GroupsController groups] usesCustomDownloadLocationForIndex: [self groupValue]])
    {
        NSString *location = [[GroupsController groups] customDownloadLocationForIndex: [self groupValue]];
        [self changeDownloadFolderBeforeUsing: location determinationType:TorrentDeterminationAutomatic];
    }

    [[NSNotificationCenter defaultCenter] postNotificationName: @"ResetInspector" object: self userInfo: @{ @"Torrent" : self }];
}

- (void)renameFinished: (BOOL) success nodes: (NSArray *) nodes completionHandler: (void (^)(BOOL)) completionHandler oldPath: (NSString *) oldPath newName: (NSString *) newName
{
    NSParameterAssert(completionHandler != nil);
    NSParameterAssert(oldPath != nil);
    NSParameterAssert(newName != nil);

    NSString * path = [oldPath stringByDeletingLastPathComponent];

    if (success)
    {
        NSString * oldName = [oldPath lastPathComponent];
        void (^__block __weak weakUpdateNodeAndChildrenForRename)(FileListNode *);
        void (^updateNodeAndChildrenForRename)(FileListNode *);
        weakUpdateNodeAndChildrenForRename = updateNodeAndChildrenForRename = ^(FileListNode * node) {
            [node updateFromOldName: oldName toNewName: newName inPath: path];

            if ([node isFolder]) {
                [[node children] enumerateObjectsWithOptions: NSEnumerationConcurrent usingBlock: ^(FileListNode * childNode, NSUInteger idx, BOOL * stop) {
                    weakUpdateNodeAndChildrenForRename(childNode);
                }];
            }
        };

        if (!nodes)
            nodes = fFlatFileList;
        [nodes enumerateObjectsWithOptions: NSEnumerationConcurrent usingBlock: ^(FileListNode * node, NSUInteger idx, BOOL *stop) {
            updateNodeAndChildrenForRename(node);
        }];

        //resort lists
        NSMutableArray * fileList = [fFileList mutableCopy];
        [self sortFileList: fileList];
        fFileList = fileList;

        NSMutableArray * flatFileList = [fFlatFileList mutableCopy];
        [self sortFileList: flatFileList];
        fFlatFileList = flatFileList;

        fIcon = nil;
    }
    else
        NSLog(@"Error renaming %@ to %@", oldPath, [path stringByAppendingPathComponent: newName]);

    completionHandler(success);
}

- (BOOL) shouldShowEta
{
    if (fStat->activity == TR_STATUS_DOWNLOAD)
        return YES;
    else if ([self isSeeding])
    {
        //ratio: show if it's set at all
        if (tr_torrentGetSeedRatio(fHandle, NULL))
            return YES;

        //idle: show only if remaining time is less than cap
        if (fStat->etaIdle != TR_ETA_NOT_AVAIL && fStat->etaIdle < ETA_IDLE_DISPLAY_SEC)
            return YES;
    }

    return NO;
}

- (NSString *) etaString
{
    NSInteger eta;
    BOOL fromIdle;
    //don't check for both, since if there's a regular ETA, the torrent isn't idle so it's meaningless
    if (fStat->eta != TR_ETA_NOT_AVAIL && fStat->eta != TR_ETA_UNKNOWN)
    {
        eta = fStat->eta;
        fromIdle = NO;
    }
    else if (fStat->etaIdle != TR_ETA_NOT_AVAIL && fStat->etaIdle < ETA_IDLE_DISPLAY_SEC)
    {
        eta = fStat->etaIdle;
        fromIdle = YES;
    }
    else
        return NSLocalizedString(@"remaining time unknown", "Torrent -> eta string");

    static NSDateComponentsFormatter *formatter;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        formatter = [NSDateComponentsFormatter new];
        formatter.unitsStyle = NSDateComponentsFormatterUnitsStyleShort;
        formatter.maximumUnitCount = 2;
        formatter.collapsesLargestUnit = YES;
        formatter.includesTimeRemainingPhrase = YES;
    });
    NSString * idleString = [formatter stringFromTimeInterval: eta];
    
    if (fromIdle) {
        idleString = [idleString stringByAppendingFormat: @" (%@)", NSLocalizedString(@"inactive", "Torrent -> eta string")];
    }

    return idleString;
}

- (void) setTimeMachineExclude: (BOOL) exclude
{
    NSString * path;
    if ((path = [self dataLocation]))
    {
        CSBackupSetItemExcluded((__bridge CFURLRef)[NSURL fileURLWithPath: path], exclude, false);
        fTimeMachineExcludeInitialized = YES;
    }
}

@end