#import "TGCameraCapturedVideo.h"
#import <AVFoundation/AVFoundation.h>
#import <LegacyComponents/TGMediaAssetImageSignals.h>
#import <LegacyComponents/TGPhotoEditorUtils.h>

#import "LegacyComponentsGlobals.h"
#import "TGStringUtils.h"
#import "TGMediaAsset.h"
#import "TGMediaAsset+TGMediaEditableItem.h"

#import "TGGifConverter.h"

@interface TGCameraCapturedVideo ()
{
    CGSize _cachedSize;
    NSTimeInterval _cachedDuration;

    SVariable *_avAssetVariable;
    AVURLAsset *_cachedAVAsset;
    bool _livePhoto;
}
@end

@implementation TGCameraCapturedVideo

+ (NSURL *)videoURLForAsset:(TGMediaAsset *)asset {
    if (asset.type == TGMediaAssetGifType) {
        NSURL *convertedGifsUrl = [NSURL fileURLWithPath:[[[LegacyComponentsGlobals provider] dataStoragePath] stringByAppendingPathComponent:@"convertedGifs"]];
        [[NSFileManager defaultManager] createDirectoryAtPath:convertedGifsUrl.path withIntermediateDirectories:true attributes:nil error:nil];
        return [convertedGifsUrl URLByAppendingPathComponent:[NSString stringWithFormat:@"%@.mp4", [TGStringUtils md5:asset.identifier]]];
    } else {
        NSURL *convertedLivePhotosUrl = [NSURL fileURLWithPath:[[[LegacyComponentsGlobals provider] dataStoragePath] stringByAppendingPathComponent:@"convertedLivePhotos"]];
        [[NSFileManager defaultManager] createDirectoryAtPath:convertedLivePhotosUrl.path withIntermediateDirectories:true attributes:nil error:nil];
        return [convertedLivePhotosUrl URLByAppendingPathComponent:[NSString stringWithFormat:@"%@.mp4", [TGStringUtils md5:asset.identifier]]];
    }
}

- (instancetype)initWithURL:(NSURL *)url
{
    self = [super init];
    if (self != nil)
    {
        if (![url.absoluteString.lowercaseString hasSuffix:@".mp4"]) {
            NSURL *pathUrl = [NSURL fileURLWithPath:[[[LegacyComponentsGlobals provider] dataStoragePath] stringByAppendingPathComponent:@"videos"]];
            [[NSFileManager defaultManager] createDirectoryAtPath:pathUrl.path withIntermediateDirectories:true attributes:nil error:nil];
            NSURL *updatedUrl = [pathUrl URLByAppendingPathComponent:[NSString stringWithFormat:@"%@.mp4", [TGStringUtils md5:url.absoluteString]]];
            [[NSFileManager defaultManager] createSymbolicLinkAtPath:updatedUrl.path withDestinationPath:url.path error:nil];
            url = updatedUrl;
        }
        _cachedAVAsset = [[AVURLAsset alloc] initWithURL:url options:nil];
        _cachedSize = CGSizeZero;
        _cachedDuration = 0.0;
    }
    return self;
}

- (instancetype)initWithAsset:(TGMediaAsset *)asset livePhoto:(bool)livePhoto
{
    self = [super init];
    if (self != nil)
    {
        _originalAsset = asset;
        _livePhoto = livePhoto;
        
        _cachedSize = CGSizeZero;
        _cachedDuration = 0.0;
    }
    return self;
}

- (void)_cleanUp
{
    if (_originalAsset == nil) {
        [[NSFileManager defaultManager] removeItemAtPath:_cachedAVAsset.URL.path error:nil];
    }
}

- (bool)isVideo
{
    return true;
}

- (bool)isAnimation {
    return _originalAsset != nil;
}

- (AVAsset *)immediateAVAsset {
    return _cachedAVAsset;
}

- (NSString *)uniformTypeIdentifier
{
    return nil;
}

- (SSignal *)avAsset {
    if (_originalAsset != nil) {
        if (_cachedAVAsset != nil) {
             return [SSignal single:_cachedAVAsset];
        } else {
            NSURL *videoUrl = [TGCameraCapturedVideo videoURLForAsset:_originalAsset];
            if ([[NSFileManager defaultManager] fileExistsAtPath:videoUrl.path isDirectory:nil]) {
                _cachedAVAsset = [AVURLAsset assetWithURL:videoUrl];
                return [SSignal single:_cachedAVAsset];
            } else {
                if (_avAssetVariable != nil) {
                    return [_avAssetVariable signal];
                }
        
                _avAssetVariable = [[SVariable alloc] init];
                
                if (_originalAsset.type == TGMediaAssetGifType) {
                    [_avAssetVariable set:[[SSignal single:@0.0] then:[[[TGMediaAssetImageSignals imageDataForAsset:_originalAsset allowNetworkAccess:false] mapToSignal:^SSignal *(TGMediaAssetImageData *assetData) {
                        NSData *data = assetData.imageData;
                        
                        const char *gif87Header = "GIF87";
                        const char *gif89Header = "GIF89";
                        if (data.length >= 5 && (!memcmp(data.bytes, gif87Header, 5) || !memcmp(data.bytes, gif89Header, 5)))
                        {
                            return [[TGGifConverter convertGifToMp4:data] map:^id(NSDictionary *result)
                            {
                                NSString *filePath = result[@"path"];
                                [[NSFileManager defaultManager] moveItemAtPath:filePath toPath:videoUrl.path error:nil];
                                
                                return [AVURLAsset assetWithURL:videoUrl];
                            }];
                        } else {
                            return [SSignal complete];
                        }
                    }] onNext:^(id next) {
                        _cachedAVAsset = next;
                    }]]];
                } else {
                    [_avAssetVariable set:[[[TGMediaAssetImageSignals avAssetForVideoAsset:_originalAsset allowNetworkAccess:false] mapToSignal:^SSignal *(AVURLAsset *asset) {
                        return [SSignal single:asset];
                    }] onNext:^(id next) {
                        _cachedAVAsset = next;
                    }]];
                }
                
                return [_avAssetVariable signal];
            }
        }
    } else {
        return [SSignal single:_cachedAVAsset];
    }
}

- (NSString *)uniqueIdentifier
{
    if (_originalAsset) {
        return _originalAsset.uniqueIdentifier;
    } else {
        return _cachedAVAsset.URL.absoluteString;
    }
}

- (CGSize)originalSize
{
    if (!CGSizeEqualToSize(_cachedSize, CGSizeZero))
        return _cachedSize;
    
    if (_originalAsset != nil) {
        return [_originalAsset originalSize];
    }
    
    AVAssetTrack *track = [_cachedAVAsset tracksWithMediaType:AVMediaTypeVideo].firstObject;
    _cachedSize = CGRectApplyAffineTransform((CGRect){ CGPointZero, track.naturalSize }, track.preferredTransform).size;
    return _cachedSize;
}

- (CGSize)dimensions
{
    return [self originalSize];
}

- (NSTimeInterval)videoDuration
{
    return [self originalDuration];
}

- (NSTimeInterval)originalDuration
{
    if (_cachedDuration > DBL_EPSILON)
        return _cachedDuration;
    
    if (_cachedAVAsset != nil) {
        _cachedDuration = CMTimeGetSeconds(_cachedAVAsset.duration);
    }
    
    return _cachedDuration;
}

- (SSignal *)thumbnailImageSignal
{
    if (_originalAsset != nil) {
        return [_originalAsset thumbnailImageSignal];
    } else {
        CGFloat thumbnailImageSide = TGPhotoEditorScreenImageMaxSize().width;
        CGSize size = TGScaleToSize(self.originalSize, CGSizeMake(thumbnailImageSide, thumbnailImageSide));
    
        return [TGMediaAssetImageSignals videoThumbnailForAVAsset:_cachedAVAsset size:size timestamp:kCMTimeZero];
    }
}

- (SSignal *)screenImageSignal:(NSTimeInterval)position
{
    if (_originalAsset != nil) {
        return [_originalAsset screenImageSignal:position];
    } else {
        CGFloat imageSide = 1280.0f;
        CGSize size = TGScaleToSize(self.originalSize, CGSizeMake(imageSide, imageSide));

        return [TGMediaAssetImageSignals videoThumbnailForAVAsset:_cachedAVAsset size:size timestamp:kCMTimeZero];
    }
}

- (SSignal *)originalImageSignal:(NSTimeInterval)position
{
    return [[self avAsset] mapToSignal:^SSignal *(AVURLAsset *avAsset) {
        return [TGMediaAssetImageSignals videoThumbnailForAVAsset:avAsset size:self.originalSize timestamp:CMTimeMakeWithSeconds(position, NSEC_PER_SEC)];
    }];
}

@end