/*  HBAudio.m $

 This file is part of the HandBrake source code.
 Homepage: <http://handbrake.fr/>.
 It may be used under the terms of the GNU General Public License. */

#import "HBAudio.h"

#import "HBJob.h"
#import "HBJob+HBJobConversion.h"
#import "HBTitle.h"
#import "HBAudioTrack.h"
#import "HBAudioTrackPreset.h"
#import "HBAudioDefaults.h"

#import "HBCodingUtilities.h"
#import "HBLocalizationUtilities.h"
#import "HBJob+Private.h"

#include "handbrake/handbrake.h"

#define NONE_TRACK_INDEX 0

NSString *HBAudioEncoderChangedNotification = @"HBAudioEncoderChangedNotification";

@interface HBAudio () <HBAudioTrackDataSource, HBAudioTrackDelegate>

@property (nonatomic, readwrite, weak) HBJob *job;
@property (nonatomic, readwrite) int container;

@end

@implementation HBAudio

- (instancetype)initWithJob:(HBJob *)job
{
    self = [super init];
    if (self)
    {
        _job = job;
        _container = HB_MUX_MP4;

        _tracks = [[NSMutableArray alloc] init];
        _defaults = [[HBAudioDefaults alloc] init];

        // Add the none track to the source array
        NSMutableArray<HBTitleAudioTrack *> *sourceTracks = [job.title.audioTracks mutableCopy];
        HBTitleAudioTrack *none = [[HBTitleAudioTrack alloc] initWithDisplayName:HBKitLocalizedString(@"None", @"HBAudio -> none track name")];
        [sourceTracks insertObject:none atIndex:0];
        _sourceTracks = [sourceTracks copy];
    }
    return self;
}

#pragma mark - Data Source

- (nullable NSString *)defaultTitleForTrackAtIndex:(NSUInteger)idx mixdown:(int)mixdown
{
    HBTitleAudioTrack *track = [self sourceTrackAtIndex:idx];

    const char *title = hb_audio_name_generate_s(track.title.UTF8String,
                                                 track.chLayout.UTF8String, mixdown,
                                                 self.defaults.passthruName,
                                                 (hb_audio_autonaming_behavior_t)self.defaults.automaticNamingBehavior);

    return title ? @(title) : nil;
}

- (HBTitleAudioTrack *)sourceTrackAtIndex:(NSUInteger)idx
{
    return self.sourceTracks[idx];
}

- (NSArray<NSString *> *)sourceTracksArray
{
    NSMutableArray<NSString *> *sourceNames = [NSMutableArray array];

    for (HBTitleAudioTrack *track in self.sourceTracks)
    {
        if (track.title.length)
        {
            [sourceNames addObject:[NSString stringWithFormat:@"%@ - %@", track.displayName, track.title]];
        }
        else
        {
            [sourceNames addObject:track.displayName];
        }
    }

    return sourceNames;
}

#pragma mark - Delegate

- (void)track:(HBAudioTrack *)track didChangeSourceFrom:(NSUInteger)oldSourceIdx
{
    // If the source was changed to None, remove the track
    if (track.sourceTrackIdx == NONE_TRACK_INDEX)
    {
        NSUInteger idx = [self.tracks indexOfObject:track];
        [self removeObjectFromTracksAtIndex:idx];
    }
    // Else add a new None track
    else if (oldSourceIdx == NONE_TRACK_INDEX)
    {
        [self addNoneTrack];
    }
}

- (void)addNoneTrack
{
    HBAudioTrack *track = [self trackFromSourceTrackIndex:NONE_TRACK_INDEX];
    [self addTrack:track];
}

#pragma mark - Public methods

- (void)addAllTracks
{
    [self removeTracksAtIndexes:[NSIndexSet indexSetWithIndexesInRange:NSMakeRange(0, self.tracks.count)]];

    // Add the remaining tracks
    for (NSUInteger idx = 1; idx < self.sourceTracksArray.count; idx++)
    {
        [self addTrack:[self trackFromSourceTrackIndex:idx]];
    }

    [self addNoneTrack];
}

- (void)removeAll
{
    [self removeTracksAtIndexes:[NSIndexSet indexSetWithIndexesInRange:NSMakeRange(0, self.tracks.count)]];
    [self addNoneTrack];
}

- (void)reloadDefaults
{
    [self addDefaultTracksFromJobSettings:self.job.jobDict];
}

- (void)setContainer:(int)container
{
    _container = container;
    if (!(self.undo.isUndoing || self.undo.isRedoing))
    {
        for (HBAudioTrack *track in self.tracks)
        {
            track.container = container;
        }

        // Update the Auto Passthru Fallback Codec Popup
        // lets get the tag of the currently selected item first so we might reset it later
        [self.defaults validateEncoderFallbackForVideoContainer:container];
    }
}

- (void)setUndo:(NSUndoManager *)undo
{
    _undo = undo;
    for (HBAudioTrack *track in self.tracks)
    {
        track.undo = undo;
    }
    self.defaults.undo = undo;
}

- (void)setDefaults:(HBAudioDefaults *)defaults
{
    if (defaults != _defaults)
    {
        [[self.undo prepareWithInvocationTarget:self] setDefaults:_defaults];
    }
    _defaults = defaults;
    _defaults.undo = self.undo;
}

/**
 *  Convenience method to add a track to tracks array.
 *
 *  @param track the track to add.
 */
- (void)addTrack:(HBAudioTrack *)newTrack
{
    [self insertObject:newTrack inTracksAtIndex:[self countOfTracks]];
}

/**
 *  Creates a new track dictionary from a source track.
 *
 *  @param index the index of the source track in the sourceTracks array
 */
- (HBAudioTrack *)trackFromSourceTrackIndex:(NSInteger)trackIndex
{
    HBAudioTrack *track = [[HBAudioTrack alloc] initWithTrackIdx:trackIndex container:self.container dataSource:self delegate:self];
    track.undo = self.undo;

    return track;
}

- (HBAudioTrack *)trackFromSourceTitleTrackIndex:(NSInteger)trackIndex
{
    NSInteger index = 0;
    for (HBTitleAudioTrack *sourceTrack in self.sourceTracks)
    {
        if (sourceTrack.index == trackIndex)
        {
            HBAudioTrack *track = [[HBAudioTrack alloc] initWithTrackIdx:index container:self.container dataSource:self delegate:self];
            track.undo = self.undo;
            return track;
        }
        index += 1;
    }
    return nil;
}

#pragma mark - Defaults

- (void)addDefaultTracksFromJobSettings:(NSDictionary *)settings
{
    NSMutableArray<HBAudioTrack *> *tracks = [NSMutableArray array];
    NSArray<NSDictionary<NSString *, id> *> *settingsTracks = settings[@"Audio"][@"AudioList"];

    // Reinitialize the configured list of audio tracks
    [self removeTracksAtIndexes:[NSIndexSet indexSetWithIndexesInRange:NSMakeRange(0, self.tracks.count)]];

    // Add the tracks
    for (NSDictionary *trackDict in settingsTracks)
    {
        HBAudioTrack *track = [self trackFromSourceTitleTrackIndex:[trackDict[@"Track"] unsignedIntegerValue]];
        if (track)
        {
            track.drc = [trackDict[@"DRC"] doubleValue];
            track.gain = [trackDict[@"Gain"] doubleValue];
            track.mixdown = hb_mixdown_get_from_name([trackDict[@"Mixdown"] UTF8String]);
            track.sampleRate = [trackDict[@"Samplerate"] intValue] == -1 ? 0 : [trackDict[@"Samplerate"] intValue];
            track.bitRate = [trackDict[@"Bitrate"] intValue];
            track.encoder = hb_audio_encoder_get_from_name([trackDict[@"Encoder"] UTF8String]);
            track.title = trackDict[@"Name"];

            [tracks addObject:track];
        }
    }

    [self insertTracks:tracks atIndexes:[NSIndexSet indexSetWithIndexesInRange:NSMakeRange(0, tracks.count)]];

    // Add an None item
    [self addNoneTrack];
}

- (BOOL)anyCodecMatches:(int)codec
{
    for (HBAudioTrack *track in self.tracks)
    {
        if (track.isEnabled && codec == track.encoder)
        {
            return YES;
        }
    }
    return NO;
}

#pragma mark -
#pragma mark Notification Handling

- (void)encoderChanged
{
    [[NSNotificationCenter defaultCenter] postNotificationName:HBAudioEncoderChangedNotification object:self];
}

#pragma mark - NSCopying

- (instancetype)copyWithZone:(NSZone *)zone
{
    HBAudio *copy = [[[self class] alloc] init];

    if (copy)
    {
        copy->_container = _container;
        copy->_sourceTracks = [_sourceTracks copy];

        copy->_tracks = [[NSMutableArray alloc] init];

        for (HBAudioTrack *track in _tracks)
        {
            HBAudioTrack *trackCopy = [track copy];
            [copy->_tracks addObject:trackCopy];

            trackCopy.dataSource = copy;
            trackCopy.delegate = copy;
        }

        copy->_defaults = [_defaults copy];
    }

    return copy;
}

#pragma mark - NSCoding

+ (BOOL)supportsSecureCoding
{
    return YES;
}

- (void)encodeWithCoder:(NSCoder *)coder
{
    [coder encodeInt:2 forKey:@"HBAudioVersion"];

    encodeInt(_container);
    encodeObject(_sourceTracks);
    encodeObject(_tracks);
    encodeObject(_defaults);
}

- (instancetype)initWithCoder:(NSCoder *)decoder
{
    self = [super init];

    decodeInt(_container); if (_container != HB_MUX_MP4 && _container != HB_MUX_MKV && _container != HB_MUX_WEBM) { goto fail; }
    decodeCollectionOfObjectsOrFail(_sourceTracks, NSArray, HBTitleAudioTrack);
    if (_sourceTracks.count < 1) { goto fail; }
    decodeCollectionOfObjectsOrFail(_tracks, NSMutableArray, HBAudioTrack);

    for (HBAudioTrack *track in _tracks)
    {
        track.dataSource = self;
        track.delegate = self;
    }

    decodeObjectOrFail(_defaults, HBAudioDefaults);

    return self;

fail:
    return nil;
}

#pragma mark - Presets

- (void)writeToPreset:(HBMutablePreset *)preset
{
    [self.defaults writeToPreset:preset];
}

- (void)applyPreset:(HBPreset *)preset jobSettings:(NSDictionary *)settings
{
    [self.defaults applyPreset:preset jobSettings:settings];
    [self addDefaultTracksFromJobSettings:settings];
}

#pragma mark -
#pragma mark KVC

- (NSUInteger)countOfTracks
{
    return self.tracks.count;
}

- (HBAudioTrack *)objectInTracksAtIndex:(NSUInteger)index
{
    return self.tracks[index];
}

- (void)insertObject:(HBAudioTrack *)track inTracksAtIndex:(NSUInteger)index
{
    [[self.undo prepareWithInvocationTarget:self] removeObjectFromTracksAtIndex:index];
    [self.tracks insertObject:track atIndex:index];
}

- (void)insertTracks:(NSArray<HBAudioTrack *> *)array atIndexes:(NSIndexSet *)indexes
{
    [[self.undo prepareWithInvocationTarget:self] removeTracksAtIndexes:indexes];
    [self.tracks insertObjects:array atIndexes:indexes];
}

- (void)removeObjectFromTracksAtIndex:(NSUInteger)index
{
    HBAudioTrack *track = self.tracks[index];
    [[self.undo prepareWithInvocationTarget:self] insertObject:track inTracksAtIndex:index];
    [self.tracks removeObjectAtIndex:index];
}

- (void)removeTracksAtIndexes:(NSIndexSet *)indexes
{
    NSArray<HBAudioTrack *> *tracks = [self.tracks objectsAtIndexes:indexes];
    [[self.undo prepareWithInvocationTarget:self] insertTracks:tracks atIndexes:indexes];
    [self.tracks removeObjectsAtIndexes:indexes];
}

@end
