/*

     File: FavoriteAssets.m 

 Abstract: n/a 

  Version: 1.2 

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*/

#import "ApplicationConstants.h"

#import "AssetsList.h"

#import "FavoriteAssets.h"

#import <AssetsLibrary/AssetsLibrary.h>

NSString * const kFavoriteAssetsChanged = @"FavoriteAssetsChanged";

static NSString * const kFavoriteAssetsTitle = @"Favorites";

@interface FavoriteAssets (Serialization)

- (void)readFavoriteAssets;

- (void)saveFavoriteAssets;

@end

@implementation FavoriteAssets

- (id)init {

    self = [super init];

    if (self) {

        [self readFavoriteAssets];

        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(toggleFavoriteStatus:) name:kToggleFavoriteStatusNotification object:nil];

    }

    return self;

}

- (void)dealloc {

    [[NSNotificationCenter defaultCenter] removeObserver:self];

    [favoriteAssetsURLs release];

    [super dealloc];

}

- (BOOL)isFavorite:(ALAsset *)asset {

    NSURL *representationURL = [[asset defaultRepresentation] url];

    if ([favoriteAssetsURLs containsObject:representationURL]) {

        return YES;

    } else {

        return NO;

    }

}

- (AssetsList *)assetsList {

    AssetsList *result = [[AssetsList alloc] initWithAssetsURLs:[favoriteAssetsURLs allObjects]];

    result.title = kFavoriteAssetsTitle;

    return [result autorelease];

}

- (NSUInteger) count {

    return [favoriteAssetsURLs count];

}

- (CGImageRef)posterImage {

    UIImage *posterImage = [UIImage imageNamed:@"gold-star.png"];

    return [posterImage CGImage];

}

- (id)valueForProperty:(NSString *)propertyName {

    if ([propertyName isEqualToString:ALAssetsGroupPropertyName]) {

        return kFavoriteAssetsTitle;

    } else {

        return @"";

    }

}

#pragma mark -

#pragma mark Toggle Favorite Status Notification

- (void)toggleFavoriteStatus:(NSNotification *)notification {

    NSDictionary *userInfo = [notification userInfo];

    NSURL *assetURL = [userInfo objectForKey:kToggleFavoriteStatusNotificationAssetURLKey];

    if ([favoriteAssetsURLs containsObject:assetURL]) {

        [favoriteAssetsURLs removeObject:assetURL];

    } else {

        [favoriteAssetsURLs addObject:assetURL];

    }

    [self saveFavoriteAssets];

    [[NSNotificationCenter defaultCenter] postNotificationName:kFavoriteAssetsChanged object:nil];

}

@end

@implementation FavoriteAssets (Serialization)

- (void)readFavoriteAssets {

    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);

    NSString *documentsDirectoryPath = [paths objectAtIndex:0];

    NSArray *favoriteURLsAsStrings = [[NSArray alloc] initWithContentsOfFile:[documentsDirectoryPath stringByAppendingPathComponent:@"FavoriteAssets.plist"]];

    favoriteAssetsURLs = [[NSMutableSet alloc] initWithCapacity:[favoriteURLsAsStrings count]];

    for (NSString *urlAsString in favoriteURLsAsStrings) {

        NSURL *url = [[NSURL alloc] initWithString:urlAsString];

        [favoriteAssetsURLs addObject:url];

        [url release];

    }

    [favoriteURLsAsStrings release];

}

- (void)saveFavoriteAssets {

    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);

    NSString *documentsDirectoryPath = [paths objectAtIndex:0];

    NSMutableArray *urlsAsStrings = [[NSMutableArray alloc] initWithCapacity:[favoriteAssetsURLs count]];

    for (NSURL *url in [favoriteAssetsURLs allObjects]) {

        NSString *urlString = [url absoluteString];

        [urlsAsStrings addObject:urlString];

    }

    BOOL success = [urlsAsStrings writeToFile:[documentsDirectoryPath stringByAppendingPathComponent:@"FavoriteAssets.plist"] atomically:YES];

    if (!success) {

        NSLog(@"error writing to the favorite assets file");

    }

    [urlsAsStrings release];

}

@end