//
//  PlaylistLoader.m
//  Cog
//
//  Created by Vincent Spader on 3/05/07.
//  Copyright 2007 Vincent Spader All rights reserved.
//

#include <objc/runtime.h>

#include <mach/semaphore.h>

#import "Cog-Swift.h"
#import <CoreData/CoreData.h>

#import "AppController.h"
#import "PlaylistController.h"
#import "PlaylistEntry.h"
#import "PlaylistLoader.h"

#import "NSFileHandle+CreateFile.h"

#import "CogAudio/AudioContainer.h"
#import "CogAudio/AudioMetadataReader.h"
#import "CogAudio/AudioPlayer.h"
#import "CogAudio/AudioPropertiesReader.h"

#import "XmlContainer.h"

#import "NSData+MD5.h"

#import "NSString+FinderCompare.h"

#import "SQLiteStore.h"

#import "Logging.h"

#import "NSDictionary+Merge.h"

#import "RedundantPlaylistDataStore.h"

#import "SandboxBroker.h"

@import Firebase;

extern NSMutableDictionary<NSString *, AlbumArtwork *> *kArtworkDictionary;

@implementation PlaylistLoader

- (id)init {
	self = [super init];
	if(self) {
		[self initDefaults];

		queue = [[NSOperationQueue alloc] init];
		[queue setMaxConcurrentOperationCount:8];

		queuedURLs = [[NSMutableDictionary alloc] init];
	}

	return self;
}

- (void)initDefaults {
	NSDictionary *defaultsDictionary = @{ @"readCueSheetsInFolders": @(YES),
		                                  @"addOtherFilesInFolders": @(NO) };

	[[NSUserDefaults standardUserDefaults] registerDefaults:defaultsDictionary];
}

- (BOOL)save:(NSString *)filename {
	NSString *ext = [filename pathExtension];
	if([ext isEqualToString:@"pls"]) {
		return [self save:filename asType:kPlaylistPls];
	} else {
		return [self save:filename asType:kPlaylistM3u];
	}
}

- (BOOL)save:(NSString *)filename asType:(PlaylistType)type {
	if(type == kPlaylistM3u) {
		return [self saveM3u:filename];
	} else if(type == kPlaylistPls) {
		return [self savePls:filename];
	} else if(type == kPlaylistXml) {
		return [self saveXml:filename];
	}

	return NO;
}

- (NSString *)relativePathFrom:(NSString *)filename toURL:(NSURL *)entryURL {
	NSString *basePath = [[[filename stringByStandardizingPath] stringByDeletingLastPathComponent] stringByAppendingString:@"/"];

	if([entryURL isFileURL]) {
		// We want relative paths.
		NSMutableString *entryPath = [[[entryURL path] stringByStandardizingPath] mutableCopy];

		[entryPath replaceOccurrencesOfString:basePath withString:@"" options:(NSAnchoredSearch | NSLiteralSearch | NSCaseInsensitiveSearch) range:NSMakeRange(0, [entryPath length])];
		if([entryURL fragment]) {
			[entryPath appendString:@"#"];
			[entryPath appendString:[entryURL fragment]];
		}

		return entryPath;
	} else {
		// Write [entryURL absoluteString] to file
		return [entryURL absoluteString];
	}
}

- (BOOL)saveM3u:(NSString *)filename {
	NSFileHandle *fileHandle = [NSFileHandle fileHandleForWritingAtPath:filename createFile:YES];
	if(!fileHandle) {
		ALog(@"Error saving m3u!");
		return NO;
	}
	[fileHandle truncateFileAtOffset:0];
	[fileHandle writeData:[@"#\n" dataUsingEncoding:NSUTF8StringEncoding]];

	for(PlaylistEntry *pe in [playlistController arrangedObjects]) {
		NSString *path = [self relativePathFrom:filename toURL:pe.url];
		[fileHandle writeData:[[path stringByAppendingString:@"\n"] dataUsingEncoding:NSUTF8StringEncoding]];
	}

	[fileHandle closeFile];

	return YES;
}

- (BOOL)savePls:(NSString *)filename {
	NSFileHandle *fileHandle = [NSFileHandle fileHandleForWritingAtPath:filename createFile:YES];
	if(!fileHandle) {
		return NO;
	}
	[fileHandle truncateFileAtOffset:0];

	[fileHandle writeData:[[NSString stringWithFormat:@"[playlist]\nnumberOfEntries=%lu\n\n", (unsigned long)[[playlistController content] count]] dataUsingEncoding:NSUTF8StringEncoding]];

	int i = 1;
	for(PlaylistEntry *pe in [playlistController arrangedObjects]) {
		NSString *path = [self relativePathFrom:filename toURL:pe.url];
		NSString *entry = [NSString stringWithFormat:@"File%i=%@\n", i, path];

		[fileHandle writeData:[entry dataUsingEncoding:NSUTF8StringEncoding]];
		i++;
	}

	[fileHandle writeData:[@"\nVERSION=2" dataUsingEncoding:NSUTF8StringEncoding]];
	[fileHandle closeFile];

	return YES;
}

NSMutableDictionary *dictionaryWithPropertiesOfObject(id obj, NSArray *filterList) {
	NSMutableDictionary *dict = [NSMutableDictionary dictionary];

	Class class = [obj class];

	do {
		unsigned count;
		objc_property_t *properties = class_copyPropertyList(class, &count);

		for(int i = 0; i < count; i++) {
			NSString *key = [NSString stringWithUTF8String:property_getName(properties[i])];
			if([filterList containsObject:key]) continue;

			Class classObject = NSClassFromString([key capitalizedString]);
			if(classObject) {
				id subObj = dictionaryWithPropertiesOfObject([obj valueForKey:key], filterList);
				[dict setObject:subObj forKey:key];
			} else {
				id value = [obj valueForKey:key];
				if(value) [dict setObject:value forKey:key];
			}
		}

		free(properties);

		if(count) break;

		class = [class superclass];
	} while(class);

	return dict;
}

- (BOOL)saveXml:(NSString *)filename {
	NSFileHandle *fileHandle = [NSFileHandle fileHandleForWritingAtPath:filename createFile:YES];
	if(!fileHandle) {
		return NO;
	}
	[fileHandle truncateFileAtOffset:0];

	NSArray *filterList = @[@"display", @"length", @"path", @"filename", @"status", @"statusMessage", @"spam", @"lengthText", @"positionText", @"stopAfter", @"shuffleIndex", @"index", @"current", @"queued", @"currentPosition", @"queuePosition", @"error", @"removed", @"URL", @"albumArt"];

	NSMutableDictionary *albumArtSet = [[NSMutableDictionary alloc] init];

	NSMutableArray *topLevel = [[NSMutableArray alloc] init];

	for(PlaylistEntry *pe in [playlistController arrangedObjects]) {
		BOOL error = [pe error];

		NSMutableDictionary *dict = dictionaryWithPropertiesOfObject(pe, filterList);

		NSString *path = [self relativePathFrom:filename toURL:pe.url];

		[dict setObject:path forKey:@"URL"];
		NSData *albumArt = [dict objectForKey:@"albumArtInternal"];
		if(albumArt) {
			[dict removeObjectForKey:@"albumArtInternal"];
			NSString *hash = [albumArt MD5];
			if(![albumArtSet objectForKey:hash])
				[albumArtSet setObject:albumArt forKey:hash];
			[dict setObject:hash forKey:@"albumArt"];
		}

		if(error)
			[dict removeObjectForKey:@"metadataLoaded"];

		[topLevel addObject:dict];
	}

	NSMutableArray *queueList = [[NSMutableArray alloc] init];

	for(PlaylistEntry *pe in [playlistController queueList]) {
		[queueList addObject:@(pe.index)];
	}

	NSDictionary *dictionary = @{@"albumArt": albumArtSet, @"queue": queueList, @"items": topLevel};

	NSError *err;

	NSData *data = [NSPropertyListSerialization dataWithPropertyList:dictionary format:NSPropertyListXMLFormat_v1_0 options:0 error:&err];

	[fileHandle writeData:data];

	[fileHandle closeFile];

	return YES;
}

- (NSArray *)fileURLsAtPath:(NSString *)path {
	NSFileManager *manager = [NSFileManager defaultManager];

	NSMutableArray *urls = [NSMutableArray array];

	const void *sbHandle = [[SandboxBroker sharedSandboxBroker] beginFolderAccess:[NSURL fileURLWithPath:path]];
	NSArray *subpaths = [manager subpathsAtPath:path];
	[[SandboxBroker sharedSandboxBroker] endFolderAccess:sbHandle];

	for(NSString *subpath in subpaths) {
		NSString *absoluteSubpath = [NSString pathWithComponents:@[path, subpath]];

		BOOL isDir;
		if([manager fileExistsAtPath:absoluteSubpath isDirectory:&isDir] && isDir == NO) {
			if([[absoluteSubpath pathExtension] caseInsensitiveCompare:@"cue"] != NSOrderedSame ||
			   [[NSUserDefaults standardUserDefaults] boolForKey:@"readCueSheetsInFolders"]) {
				[urls addObject:[NSURL fileURLWithPath:absoluteSubpath]];
			}
		}
	}

	NSSortDescriptor *sd_path = [[NSSortDescriptor alloc] initWithKey:@"path" ascending:YES];
	[urls sortUsingDescriptors:@[sd_path]];

	return urls;
}

static inline void dispatch_sync_reentrant(dispatch_queue_t queue, dispatch_block_t block) {
	if(dispatch_queue_get_label(queue) == dispatch_queue_get_label(DISPATCH_CURRENT_QUEUE_LABEL)) {
		block();
	} else {
		dispatch_sync(queue, block);
	}
}

- (void)beginProgress:(NSString *)localizedDescription {
	while(playbackController.progressOverall) {
		[[NSRunLoop currentRunLoop] runUntilDate:[NSDate dateWithTimeIntervalSinceNow:0.01]];
	}
	dispatch_sync_reentrant(dispatch_get_main_queue(), ^{
		self->playbackController.progressOverall = [NSProgress progressWithTotalUnitCount:100000];
		self->playbackController.progressOverall.localizedDescription = localizedDescription;
	});
}

- (void)completeProgress {
	dispatch_sync_reentrant(dispatch_get_main_queue(), ^{
		if(self->playbackController.progressJob) {
			[self->playbackController.progressJob setCompletedUnitCount:100000];
			self->playbackController.progressJob = nil;
		}
		[self->playbackController.progressOverall setCompletedUnitCount:100000];
		self->playbackController.progressOverall = nil;
	});
}

- (void)beginProgressJob:(NSString *)localizedDescription percentOfTotal:(double)percent {
	dispatch_sync_reentrant(dispatch_get_main_queue(), ^{
		NSUInteger jobCount = (NSUInteger)ceil(1000.0 * percent);
		self->playbackController.progressJob = [NSProgress progressWithTotalUnitCount:100000];
		self->playbackController.progressJob.localizedDescription = localizedDescription;
		[self->playbackController.progressOverall addChild:self->playbackController.progressJob withPendingUnitCount:jobCount];
	});
}

- (void)completeProgressJob {
	dispatch_sync_reentrant(dispatch_get_main_queue(), ^{
		[self->playbackController.progressJob setCompletedUnitCount:100000];
		self->playbackController.progressJob = nil;
	});
}

- (void)setProgressStatus:(double)status {
	if(status >= 0) {
		dispatch_sync_reentrant(dispatch_get_main_queue(), ^{
			NSUInteger jobCount = (NSUInteger)ceil(1000.0 * status);
			[self->playbackController.progressOverall setCompletedUnitCount:jobCount];
		});
	} else {
		[self completeProgress];
	}
}

- (void)setProgressJobStatus:(double)status {
	if(status >= 0) {
		dispatch_sync_reentrant(dispatch_get_main_queue(), ^{
			NSUInteger jobCount = (NSUInteger)ceil(1000.0 * status);
			[self->playbackController.progressJob setCompletedUnitCount:jobCount];
		});
	} else {
		[self completeProgressJob];
	}
}

- (NSArray *)insertURLs:(NSArray *)urls atIndex:(NSInteger)index sort:(BOOL)sort {
	NSMutableSet *uniqueURLs = [NSMutableSet set];

	NSMutableArray *expandedURLs = [NSMutableArray array];
	NSMutableArray *containedURLs = [NSMutableArray array];
	NSMutableArray *fileURLs = [NSMutableArray array];
	NSMutableArray *validURLs = [NSMutableArray array];
	NSMutableArray *folderURLs = [NSMutableArray array];
	NSMutableArray *dependencyURLs = [NSMutableArray array];
	NSDictionary *xmlData = nil;

	BOOL addOtherFilesInFolder = [[NSUserDefaults standardUserDefaults] boolForKey:@"addOtherFilesInFolders"];

	double progress;

	if(!urls) {
		[self completeProgress];
		return @[];
	}

	[self beginProgress:NSLocalizedString(@"ProgressActionLoader", @"")];

	[self beginProgressJob:NSLocalizedString(@"ProgressSubActionLoaderListingFiles", @"") percentOfTotal:20.0];

	if(index < 0)
		index = 0;

	progress = 0.0;

	double progressstep = [urls count] ? 100.0 / (double)([urls count]) : 0;

	NSURL *url;
	for(url in urls) {
		if([url isFileURL]) {
			BOOL isDir;
			if([[NSFileManager defaultManager] fileExistsAtPath:[url path] isDirectory:&isDir]) {
				if(isDir == YES) {
					// Get subpaths
					[[SandboxBroker sharedSandboxBroker] addFolderIfMissing:url];
					[expandedURLs addObjectsFromArray:[self fileURLsAtPath:[url path]]];
				} else if(addOtherFilesInFolder) {
					NSURL *folderUrl = [url URLByDeletingLastPathComponent];
					if(![folderURLs containsObject:folderUrl]) {
						[[SandboxBroker sharedSandboxBroker] requestFolderForFile:url];
						[expandedURLs addObjectsFromArray:[self fileURLsAtPath:[folderUrl path]]];
						[folderURLs addObject:folderUrl];
					}
				} else {
					[[SandboxBroker sharedSandboxBroker] addFileIfMissing:url];
					[expandedURLs addObject:[NSURL fileURLWithPath:[url path]]];
				}
			}
		} else {
			// Non-file URL..
			[expandedURLs addObject:url];
		}

		progress += progressstep;

		[self setProgressJobStatus:progress];
	}

	[self completeProgressJob];

	progress = 0.0;

	DLog(@"Expanded urls: %@", expandedURLs);

	NSArray *sortedURLs;
	if(sort == YES) {
		sortedURLs = [expandedURLs sortedArrayUsingSelector:@selector(finderCompare:)];
		//		sortedURLs = [expandedURLs sortedArrayUsingSelector:@selector(compareTrackNumbers:)];
	} else {
		sortedURLs = expandedURLs;
	}

	[self beginProgressJob:NSLocalizedString(@"ProgressSubActionLoaderFilteringContainerFiles", @"") percentOfTotal:20.0];

	progressstep = [sortedURLs count] ? 100.0 / (double)([sortedURLs count]) : 0;

	for(url in sortedURLs) {
		// Container vs non-container url
		if([[self acceptableContainerTypes] containsObject:[[url pathExtension] lowercaseString]]) {
			NSArray *urls = [AudioContainer urlsForContainerURL:url];

			if(urls != nil && [urls count] != 0) {
				[containedURLs addObjectsFromArray:urls];

				// Make sure the container isn't added twice.
				[uniqueURLs addObject:url];
				
				// Find the dependencies
				NSArray *depURLs = [AudioContainer dependencyUrlsForContainerURL:url];

				BOOL localFound = NO;
				for(NSURL *u in urls) {
					if([u isFileURL]) {
						localFound = YES;
						break;
					}
				}
				if(depURLs) {
					[dependencyURLs addObjectsFromArray:depURLs];

					for(NSURL *u in depURLs) {
						if([u isFileURL]) {
							localFound = YES;
							break;
						}
					}
				}
				if(localFound) {
					[[SandboxBroker sharedSandboxBroker] requestFolderForFile:url];
				}
			} else {
				/* Fall back on adding the raw file if all container parsers have failed. */
				[fileURLs addObject:url];
			}
		} else if([[[url pathExtension] lowercaseString] isEqualToString:@"xml"]) {
			xmlData = [XmlContainer entriesForContainerURL:url];
		} else {
			[fileURLs addObject:url];
		}

		progress += progressstep;
		[self setProgressJobStatus:progress];
	}

	progress = 0.0;
	[self completeProgressJob];

	if([fileURLs count] > 0) {
		[self beginProgressJob:NSLocalizedString(@"ProgressSubActionLoaderFilteringFiles", @"") percentOfTotal:20.0];
	} else {
		[self setProgressStatus:60.0];
	}

	// Deduplication of contained URLs
	[fileURLs removeObjectsInArray:containedURLs];
	[fileURLs removeObjectsInArray:dependencyURLs];
	for(NSURL *u in dependencyURLs) {
		for(NSUInteger c = 0; c < [containedURLs count];) {
			if([[u path] isEqualToString:[containedURLs[c] path]]) {
				[containedURLs removeObjectAtIndex:c];
			} else {
				++c;
			}
		}
	}

	DLog(@"File urls: %@", fileURLs);

	DLog(@"Contained urls: %@", containedURLs);

	progressstep = [fileURLs count] ? 100.0 / (double)([fileURLs count]) : 0;

	for(url in fileURLs) {
		progress += progressstep;

		if(![[AudioPlayer schemes] containsObject:[url scheme]])
			continue;

		NSString *ext = [[url pathExtension] lowercaseString];

		// Need a better way to determine acceptable file types than basing it on extensions.
		if([url isFileURL] && ![[AudioPlayer fileTypes] containsObject:ext])
			continue;

		if(![uniqueURLs containsObject:url]) {
			[validURLs addObject:url];

			[uniqueURLs addObject:url];
		}

		[self setProgressJobStatus:progress];
	}

	progress = 0.0;

	if([fileURLs count] > 0) {
		[self completeProgressJob];
	}

	if([containedURLs count] > 0) {
		[self beginProgressJob:NSLocalizedString(@"ProgressSubActionLoaderFilteringContainedFiles", @"") percentOfTotal:20.0];
	} else {
		[self setProgressStatus:80.0];
	}

	DLog(@"Valid urls: %@", validURLs);

	progressstep = [containedURLs count] ? 100.0 / (double)([containedURLs count]) : 0;

	for(url in containedURLs) {
		progress += progressstep;

		if(![[AudioPlayer schemes] containsObject:[url scheme]])
			continue;

		// Need a better way to determine acceptable file types than basing it on extensions.
		if([url isFileURL] && ![[AudioPlayer fileTypes] containsObject:[[url pathExtension] lowercaseString]])
			continue;

		[validURLs addObject:url];

		[self setProgressJobStatus:progress];
	}

	progress = 0.0;
	if([containedURLs count] > 0) {
		[self completeProgressJob];
	}

	// Create actual entries
	int count = (int)[validURLs count];
	if(xmlData) count += [[xmlData objectForKey:@"entries"] count];

	// no valid URLs, or they use an unsupported URL scheme
	if(!count) {
		[self completeProgress];
		return @[];
	}

	[self beginProgressJob:NSLocalizedString(@"ProgressSubActionLoaderAddingEntries", @"") percentOfTotal:20.0];

	progressstep = 100.0 / (double)(count);

	NSInteger i = 0;
	__block NSMutableArray *entries = [NSMutableArray arrayWithCapacity:count];
	for(NSURL *url in validURLs) {
		__block PlaylistEntry *pe;

		dispatch_sync_reentrant(dispatch_get_main_queue(), ^{
			pe = [NSEntityDescription insertNewObjectForEntityForName:@"PlaylistEntry" inManagedObjectContext:self->playlistController.persistentContainer.viewContext];
			pe.url = url;
			pe.index = index + i;
			pe.rawTitle = [[url path] lastPathComponent];
			pe.queuePosition = -1;
		});

		[entries addObject:pe];

		++i;

		progress += progressstep;
		[self setProgressJobStatus:progress];
	}

	NSInteger j = index + i;

	if(xmlData) {
		for(NSDictionary *entry in [xmlData objectForKey:@"entries"]) {
			__block PlaylistEntry *pe;

			dispatch_sync_reentrant(dispatch_get_main_queue(), ^{
				pe = [NSEntityDescription insertNewObjectForEntityForName:@"PlaylistEntry" inManagedObjectContext:self->playlistController.persistentContainer.viewContext];
				[pe setValuesForKeysWithDictionary:entry];
				pe.index = index + i;
				pe.queuePosition = -1;
			});

			[entries addObject:pe];

			++i;
		}
	}

	[self completeProgress];

	NSIndexSet *is = [NSIndexSet indexSetWithIndexesInRange:NSMakeRange(index, [entries count])];

	dispatch_sync_reentrant(dispatch_get_main_queue(), ^{
		[self->playlistController insertObjects:entries atArrangedObjectIndexes:is];
	});

	if(xmlData && [[xmlData objectForKey:@"queue"] count]) {
		dispatch_sync_reentrant(dispatch_get_main_queue(), ^{
			[self->playlistController emptyQueueList:self];

			long i = 0;
			for(NSNumber *index in [xmlData objectForKey:@"queue"]) {
				NSInteger indexVal = [index intValue] + j;
				PlaylistEntry *pe = [entries objectAtIndex:indexVal];
				pe.queuePosition = i;
				pe.queued = YES;

				[[self->playlistController queueList] addObject:pe];

				++i;
			}
		});
	}

	// Clear the selection
	dispatch_sync_reentrant(dispatch_get_main_queue(), ^{
		[self->playlistController setSelectionIndexes:[NSIndexSet indexSet]];
	});

	{
		NSArray *arrayFirst = @[[entries objectAtIndex:0]];
		NSMutableArray *arrayRest = [entries mutableCopy];
		[arrayRest removeObjectAtIndex:0];

		metadataLoadInProgress = YES;

		[self beginProgress:NSLocalizedString(@"ProgressActionLoadingMetadata", @"")];
		[self beginProgressJob:NSLocalizedString(@"ProgressSubActionLoadingMetadata", @"") percentOfTotal:50.0];

		[self performSelectorOnMainThread:@selector(syncLoadInfoForEntries:) withObject:arrayFirst waitUntilDone:YES];

		progressstep = 100.0 / (double)([entries count]);
		progress = progressstep;
		[self setProgressJobStatus:progress];

		if([arrayRest count])
			[self performSelectorInBackground:@selector(loadInfoForEntries:) withObject:arrayRest];
		else {
			dispatch_sync_reentrant(dispatch_get_main_queue(), ^{
				[self->playlistController commitPersistentStore];
			});
			[self completeProgress];
		}
		return entries;
	}
}

NSURL *_Nullable urlForPath(NSString *_Nullable path);

- (void)loadInfoForEntries:(NSArray *)entries {
	NSMutableDictionary *queueThisJob = [[NSMutableDictionary alloc] init];
	for(PlaylistEntry *pe in entries) {
		if(!pe || !pe.urlString || pe.deLeted || pe.metadataLoaded) continue;

		NSString *path = pe.urlString;
		NSMutableArray *entrySet = [queueThisJob objectForKey:path];
		if(!entrySet) {
			entrySet = [[NSMutableArray alloc] init];
			[entrySet addObject:pe];
			[queueThisJob setObject:entrySet forKey:path];
		} else {
			[entrySet addObject:pe];
		}
	}

	@synchronized(queuedURLs) {
		if([queuedURLs count]) {
			for(NSString *key in [queueThisJob allKeys]) {
				if([queuedURLs objectForKey:key]) {
					[queueThisJob removeObjectForKey:key];
				}
			}
		}
	}

	if(![queueThisJob count]) {
		size_t count;
		@synchronized (queuedURLs) {
			count = [queuedURLs count];
		}
		if(!count) {
			[playlistController performSelectorOnMainThread:@selector(updateTotalTime) withObject:nil waitUntilDone:NO];
			[self completeProgress];
			metadataLoadInProgress = NO;
		}
		return;
	}

	size_t count = 0;
	do {
		@synchronized(queuedURLs) {
			count = [queuedURLs count];
		}
		if(count) usleep(5000);
	} while(count > 0);

	@synchronized(queuedURLs) {
		[queuedURLs addEntriesFromDictionary:queueThisJob];
	}

	NSMutableIndexSet *update_indexes = [[NSMutableIndexSet alloc] init];

	__block double progress = 0.0;

	double progressstep;

	if(metadataLoadInProgress && [queueThisJob count]) {
		progressstep = 100.0 / (double)([queueThisJob count] + 1);
		progress = progressstep;
	} else if([queueThisJob count]) {
		[self beginProgress:NSLocalizedString(@"ProgressActionLoadingMetadata", @"")];
		[self beginProgressJob:NSLocalizedString(@"ProgressSubActionLoadingMetadata", @"") percentOfTotal:50.0];

		progressstep = 100.0 / (double)([entries count]);
		progress = 0.0;
	}

	NSLock *outLock = [[NSLock alloc] init];
	NSMutableArray *outArray = [[NSMutableArray alloc] init];
	RedundantPlaylistDataStore *dataStore = [[RedundantPlaylistDataStore alloc] init];

	__block NSLock *weakLock = outLock;
	__block NSMutableArray *weakArray = outArray;
	__block RedundantPlaylistDataStore *weakDataStore = dataStore;

	__block NSMutableDictionary *uniquePathsEntries = [[NSMutableDictionary alloc] init];

	{
		for(NSString *key in queueThisJob) {
			NSBlockOperation *op = [[NSBlockOperation alloc] init];
			NSURL *url = urlForPath(key);

			[op addExecutionBlock:^{
				DLog(@"Loading metadata for %@", url);
				[[FIRCrashlytics crashlytics] logWithFormat:@"Loading metadata for %@", url];

				NSDictionary *entryProperties = [AudioPropertiesReader propertiesForURL:url];
				if(entryProperties == nil)
					return;

				NSDictionary *entryMetadata = [AudioMetadataReader metadataForURL:url];

				NSDictionary *entryInfo = [NSDictionary dictionaryByMerging:entryProperties with:entryMetadata];

				[weakLock lock];
				entryInfo = [weakDataStore coalesceEntryInfo:entryInfo];
				[weakArray addObject:key];
				[weakArray addObject:entryInfo];
				[uniquePathsEntries setObject:[[NSMutableArray alloc] init] forKey:key];
				progress += progressstep;
				[self setProgressJobStatus:progress];
				[weakLock unlock];
			}];

			[queue addOperation:op];
		}
	}

	[queue waitUntilAllOperationsAreFinished];

	progress = 0.0;
	[self completeProgressJob];

	[self beginProgressJob:NSLocalizedString(@"ProgressSubActionMetadataApply", @"") percentOfTotal:50.0];

	progressstep = 200.0 / (double)([outArray count]);

	NSManagedObjectContext *moc = playlistController.persistentContainer.viewContext;

	NSPredicate *hasUrlPredicate = [NSPredicate predicateWithFormat:@"urlString != nil && urlString != %@", @""];
	NSPredicate *deletedPredicate = [NSPredicate predicateWithFormat:@"deLeted == NO || deLeted == nil"];

	NSCompoundPredicate *predicate = [NSCompoundPredicate andPredicateWithSubpredicates:@[deletedPredicate, hasUrlPredicate]];

	[moc performBlockAndWait:^{
		NSFetchRequest *request = [NSFetchRequest fetchRequestWithEntityName:@"PlaylistEntry"];
		request.predicate = predicate;

		NSError *error;
		NSArray *results = [moc executeFetchRequest:request error:&error];

		if(results && [results count] > 0) {
			for(PlaylistEntry *pe in results) {
				NSMutableArray *entrySet = [uniquePathsEntries objectForKey:pe.urlString];
				if(entrySet) {
					[entrySet addObject:pe];
				}
			}
		}
	}];

	for(size_t i = 0, j = [outArray count]; i < j; i += 2) {
		__block NSString *entryKey = [outArray objectAtIndex:i];
		__block NSDictionary *entryInfo = [outArray objectAtIndex:i + 1];
		__block NSMutableIndexSet *weakUpdateIndexes = update_indexes;
		PlaylistController *playlistController = self->playlistController;
		dispatch_sync_reentrant(dispatch_get_main_queue(), ^{
			NSArray *entrySet = [uniquePathsEntries objectForKey:entryKey];
			if(entrySet) {
				if([entrySet count] > 0) {
					[playlistController firstSawTrack:entrySet[0]];
				}
				for(PlaylistEntry *pe in entrySet) {
					[pe setMetadata:entryInfo];
					if(pe.index >= 0 && pe.index < NSNotFound) {
						[weakUpdateIndexes addIndex:pe.index];
					}
				}
			}

			progress += progressstep;
			[self setProgressJobStatus:progress];
		});
	}

	dispatch_sync_reentrant(dispatch_get_main_queue(), ^{
		[self->playlistController commitPersistentStore];
	});

	[playlistController performSelectorOnMainThread:@selector(updateTotalTime) withObject:nil waitUntilDone:NO];

	{
		__block NSScrollView *weakPlaylistView = playlistView;
		__block NSIndexSet *weakIndexSet = update_indexes;
		dispatch_sync_reentrant(dispatch_get_main_queue(), ^{
			unsigned long columns = [[[weakPlaylistView documentView] tableColumns] count];
			[weakPlaylistView.documentView reloadDataForRowIndexes:weakIndexSet columnIndexes:[NSIndexSet indexSetWithIndexesInRange:NSMakeRange(0, columns)]];
		});
	}

	@synchronized(queuedURLs) {
		[queuedURLs removeObjectsForKeys:[queueThisJob allKeys]];
	}

	[self completeProgress];
	metadataLoadInProgress = NO;
}

// To be called on main thread only
- (void)syncLoadInfoForEntries:(NSArray *)entries {
	NSMutableIndexSet *update_indexes = [[NSMutableIndexSet alloc] init];
	long i, j;
	NSMutableIndexSet *load_info_indexes = [[NSMutableIndexSet alloc] init];

	i = 0;
	j = 0;
	for(PlaylistEntry *pe in entries) {
		long idx = j++;

		if([pe metadataLoaded]) continue;

		[update_indexes addIndex:pe.index];
		[load_info_indexes addIndex:idx];

		++i;
	}

	if(!i) {
		[self->playlistController updateTotalTime];
		return;
	}

	[load_info_indexes enumerateIndexesUsingBlock:^(NSUInteger idx, BOOL *_Nonnull stop) {
		PlaylistEntry *pe = [entries objectAtIndex:idx];

		DLog(@"Loading metadata for %@", pe.url);
		[[FIRCrashlytics crashlytics] logWithFormat:@"Loading metadata for %@", pe.url];

		NSDictionary *entryProperties = [AudioPropertiesReader propertiesForURL:pe.url];
		if(entryProperties == nil)
			return;

		NSDictionary *entryInfo = [NSDictionary dictionaryByMerging:entryProperties with:[AudioMetadataReader metadataForURL:pe.url]];

		[pe setMetadata:entryInfo];
		[playlistController firstSawTrack:pe];
	}];

	[self->playlistController updateTotalTime];

	{
		unsigned long columns = [[[self->playlistView documentView] tableColumns] count];
		[self->playlistView.documentView reloadDataForRowIndexes:update_indexes columnIndexes:[NSIndexSet indexSetWithIndexesInRange:NSMakeRange(0, columns)]];
	}
}

- (void)clear:(id)sender {
	[playlistController clear:sender];
}

- (NSArray *)addURLs:(NSArray *)urls sort:(BOOL)sort {
	return [self insertURLs:urls atIndex:(int)[[playlistController content] count] sort:sort];
}

- (NSArray *)addURL:(NSURL *)url {
	return [self insertURLs:@[url] atIndex:(int)[[playlistController content] count] sort:NO];
}

- (BOOL)addDataStore {
	BOOL dataMigrated = [[NSUserDefaults standardUserDefaults] boolForKey:@"metadataMigrated"];

	NSPersistentContainer *pc = playlistController.persistentContainer;
	if(pc) {
		NSManagedObjectContext *moc = pc.viewContext;

		NSFetchRequest *request = [NSFetchRequest fetchRequestWithEntityName:@"AlbumArtwork"];
		NSError *error = nil;
		NSArray *results = [moc executeFetchRequest:request error:&error];
		if(!results) {
			ALog(@"Error fetching AlbumArtwork objects: %@\n%@", [error localizedDescription], [error userInfo]);
			abort();
		}

		for(AlbumArtwork *art in results) {
			[kArtworkDictionary setObject:art forKey:art.artHash];
		}

		request = [NSFetchRequest fetchRequestWithEntityName:@"PlaylistEntry"];

		NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"index" ascending:YES];

		request.sortDescriptors = @[sortDescriptor];

		results = [moc executeFetchRequest:request error:&error];
		if(!results) {
			ALog(@"Error fetching PlaylistEntry objects: %@\n%@", [error localizedDescription], [error userInfo]);
			abort();
		}

		if([results count] == 0) {
			return NO;
		}

		NSMutableArray *resultsCopy = [results mutableCopy];

		NSMutableIndexSet *pruneSet = [[NSMutableIndexSet alloc] init];
		NSUInteger index = 0;
		for(PlaylistEntry *pe in resultsCopy) {
			if(pe.deLeted || !pe.urlString || [pe.urlString length] < 1) {
				[pruneSet addIndex:index];
				[moc deleteObject:pe];
			}
			++index;
		}
		[resultsCopy removeObjectsAtIndexes:pruneSet];

		if(!dataMigrated) {
			for(PlaylistEntry *pe in resultsCopy) {
				pe.metadataLoaded = NO;
			}
		}

		if([pruneSet count] || !dataMigrated) {
			[playlistController commitPersistentStore];
		}

		results = [NSArray arrayWithArray:resultsCopy];

		{
			NSIndexSet *is = [NSIndexSet indexSetWithIndexesInRange:NSMakeRange(0, [results count])];

			[playlistController insertObjectsUnsynced:results atArrangedObjectIndexes:is];
		}

		[playlistController readQueueFromDataStore];
		[playlistController readShuffleListFromDataStore];

		if(!dataMigrated && [results count]) {
			[self performSelectorInBackground:@selector(loadInfoForEntries:) withObject:results];
		}

		[[NSUserDefaults standardUserDefaults] setBool:YES forKey:@"metadataMigrated"];

		return YES;
	}
	return NO;
}

- (NSArray *)addDatabase {
	SQLiteStore *store = [SQLiteStore sharedStore];

	int64_t count = [store playlistGetCountCached];

	NSInteger i = 0;
	NSMutableArray *entries = [NSMutableArray arrayWithCapacity:count];

	for(i = 0; i < count; ++i) {
		PlaylistEntry *pe = [store playlistGetCachedItem:i];

		pe.queuePosition = -1;

		[entries addObject:pe];
	}

	NSIndexSet *is = [NSIndexSet indexSetWithIndexesInRange:NSMakeRange(0, [entries count])];

	[playlistController insertObjectsUnsynced:entries atArrangedObjectIndexes:is];

	count = [store queueGetCount];

	if(count) {
		NSMutableIndexSet *refreshSet = [[NSMutableIndexSet alloc] init];

		[playlistController emptyQueueListUnsynced];

		for(i = 0; i < count; ++i) {
			NSInteger indexVal = [store queueGetEntry:i];
			PlaylistEntry *pe = [entries objectAtIndex:indexVal];
			pe.queuePosition = i;
			pe.queued = YES;

			[[playlistController queueList] addObject:pe];

			[refreshSet addIndex:[pe index]];
		}

		// Refresh entire row to refresh tooltips
		unsigned long columns = [[playlistView.documentView tableColumns] count];
		[playlistView.documentView reloadDataForRowIndexes:refreshSet columnIndexes:[NSIndexSet indexSetWithIndexesInRange:NSMakeRange(0, columns)]];
	}

	// Clear the selection
	[playlistController setSelectionIndexes:[NSIndexSet indexSet]];

	if([entries count]) {
		[self performSelectorInBackground:@selector(loadInfoForEntries:) withObject:entries];
	}

	return entries;
}

- (NSArray *)acceptableFileTypes {
	return [[self acceptableContainerTypes] arrayByAddingObjectsFromArray:[AudioPlayer fileTypes]];
}

- (NSArray *)acceptablePlaylistTypes {
	return @[@"m3u", @"pls"];
}

- (NSArray *)acceptableContainerTypes {
	return [AudioPlayer containerTypes];
}

- (void)willInsertURLs:(NSArray *)urls origin:(URLOrigin)origin {
	[playlistController willInsertURLs:urls origin:origin];
}
- (void)didInsertURLs:(NSArray *)urls origin:(URLOrigin)origin {
	[playlistController didInsertURLs:urls origin:origin];
}

- (void)addURLsInBackground:(NSDictionary *)input {
	[playlistController addURLsInBackground:input];
}

- (void)insertURLsInBackground:(NSDictionary *)input {
	[playlistController insertURLsInBackground:input];
}

@end