/* INTERFACE */
 
#import <Foundation/Foundation.h>
 
#define kFilename	@"dataarchive.plist"
#define kDataKey		@"Data"
 
@class DataModel;
@interface DataManager : NSObject {
 
	DataModel *dataModel;
}
 
@property (nonatomic, retain) DataModel *dataModel;
 
-(NSString *)dataFilePath;
-(void)initDataModel;
-(void)applicationWillTerminate:(NSNotification *)notification;
 
+(DataManager *)sharedDataManager;
 
@end
 
/* IMPLEMENTATION */
 
#import "DataManager.h"
#import "SynthesizeSingleton.h"
#import "DataModel.h"
#import "FaveVO.h"
 
@implementation DataManager
 
SYNTHESIZE_SINGLETON_FOR_CLASS(DataManager);
 
@synthesize dataModel;
 
//-----------------------------------------------------------------------------------------------------
- (NSString *)dataFilePath
{
	NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
	NSString *documentsDirectory = [paths objectAtIndex:0];
	return [documentsDirectory stringByAppendingPathComponent:kFilename];
}
//-----------------------------------------------------------------------------------------------------
-(void)initDataModel
{
	NSString *filePath = [self dataFilePath];
 
	if([[NSFileManager defaultManager] fileExistsAtPath:filePath])
	{
		NSLog(@"FILE EXISTS");
 
		NSData *data = [[NSMutableData alloc] initWithContentsOfFile:[self dataFilePath]];
		NSKeyedUnarchiver *unarchiver = [[NSKeyedUnarchiver alloc] initForReadingWithData:data];
 
		DataModel *decodedDataModel = [unarchiver decodeObjectForKey:kDataKey];
 
		dataModel = [[DataModel alloc] init];
 
		NSEnumerator *enumerator;
		enumerator = [decodedDataModel.favesArray objectEnumerator];
 
		FaveVO *decodedFaveVO;
 
		while (decodedFaveVO = [enumerator nextObject])
		{
			[dataModel createNewFaveVOFromFaveVO:decodedFaveVO];
		}
 
		int index = decodedDataModel.faveIndex;
		dataModel.faveIndex = index;
		dataModel.currentFave = [dataModel.favesArray objectAtIndex:index];
 
		[unarchiver finishDecoding];
		[unarchiver release];
		[data release];
	}
	else 
	{
		NSLog(@"FILE DOES NOT EXIST");
 
		dataModel = [[DataModel alloc] init];
	}
 
	UIApplication *app = [UIApplication sharedApplication];
	[[NSNotificationCenter defaultCenter] addObserver:self
											 selector:@selector(applicationWillTerminate:)
												 name:UIApplicationWillTerminateNotification 
											   object:app];
 
}
//-------------------------------------------------------------
- (void)applicationWillTerminate:(NSNotification *)notification
{
	NSLog(@"Application will terminate");
 
	NSMutableData *data = [[NSMutableData alloc] init];
	NSKeyedArchiver *archiver = [[NSKeyedArchiver alloc] initForWritingWithMutableData:data];
 
	[archiver encodeObject:dataModel forKey:kDataKey];
	[archiver finishEncoding];
	[data writeToFile:[self dataFilePath] atomically:YES];
 
	[archiver release];
	[data release];
}
 
 
//--------------------------------------------------
-(void)dealloc
{
	[dataModel release];
	[super dealloc];
}
 
 
@end