/*

     File: Document.m

 Abstract: The document setups up an AVPlayer, AVPlayerItem, attaches an AVPlayerItemLegibleOutput to the AVPlayerItem, and implements the AVPlayerItemLegibleOutputPushDelegate method -legibleOutput:didOutputAttributedStrings:nativeSampleBuffers:forItemTime: to display definitions for subtitles when possible.

  Version: 1.0

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 */

#import "Document.h"

#import <AVKit/AVKit.h>

#import <AVFoundation/AVFoundation.h>

@interface Document () <AVPlayerItemLegibleOutputPushDelegate>

@property (weak) IBOutlet AVPlayerView *playerView;

@property IBOutlet NSTextView *textView;

@end

@implementation Document

{

    dispatch_queue_t _legibleQueue;

    AVPlayerItemLegibleOutput *_legibleOutput;

    AVPlayer *_player;

    NSUInteger _count;

}

- (id)init

{

    self = [super init];

    if (self)

    {

        _legibleQueue = dispatch_queue_create("legible queue", DISPATCH_QUEUE_SERIAL);

        _legibleOutput = [[AVPlayerItemLegibleOutput alloc] init];

        [_legibleOutput setDelegate:self queue:_legibleQueue];

    }

    return self;

}

- (void)close

{

    [self.playerView.player pause];

    [super close];

}

- (NSString *)windowNibName

{

    return @"Document";

}

- (void)windowControllerDidLoadNib:(NSWindowController *)windowController

{

    [super windowControllerDidLoadNib:windowController];

    self.playerView.player = _player;

}

- (BOOL)readFromURL:(NSURL *)URL ofType:(NSString *)typeName error:(NSError **)outError

{

    AVAsset *asset = [AVAsset assetWithURL:URL];

    AVPlayerItem *playerItem = [AVPlayerItem playerItemWithAsset:asset];

    [playerItem addOutput:_legibleOutput];

    _player = [AVPlayer playerWithPlayerItem:playerItem];

    return YES;

}

#pragma mark AVPlayerItemLegibleOutputPushDelegate

- (void)legibleOutput:(AVPlayerItemLegibleOutput *)output didOutputAttributedStrings:(NSArray *)attributedStrings nativeSampleBuffers:(NSArray *)nativeSampleBuffers forItemTime:(CMTime)itemTime

{

    __block NSString *wordToDefine;

    // Find the longest word

    for (NSAttributedString *attributedString in attributedStrings)

    {

        NSLinguisticTagger *tagger = [[NSLinguisticTagger alloc] initWithTagSchemes:@[NSLinguisticTagSchemeTokenType] options:0];

        tagger.string = attributedString.string;

        [tagger enumerateTagsInRange:NSMakeRange(0, tagger.string.length) scheme:NSLinguisticTagSchemeTokenType options:NSLinguisticTaggerOmitPunctuation|NSLinguisticTaggerOmitWhitespace|NSLinguisticTaggerOmitOther usingBlock:^(NSString *tag, NSRange tokenRange, NSRange sentenceRange, BOOL *stop) {

            NSString *word = [tagger.string substringWithRange:tokenRange];

            if (word.length > wordToDefine.length)

                wordToDefine = word;

        }];

    }

    // And display a definition for it

    if (wordToDefine)

    {

        CFStringRef dcsDefinition = DCSCopyTextDefinition(NULL, (__bridge CFStringRef)wordToDefine, CFRangeMake(0, wordToDefine.length));

        if (dcsDefinition)

        {

            NSAttributedString *definition = [[NSAttributedString alloc] initWithString:(__bridge NSString *)dcsDefinition];

            CFRelease(dcsDefinition);

            dispatch_async(dispatch_get_main_queue(), ^{

                _textView.textStorage.attributedString = definition;

            });

        }

    }

}

@end