/*

File:       AppDelegate.m

Abstract:   Application delegate, a controller which sets up the core data stack

            for the application. This is provided by the Xcode template, 

            "Core Data Application". In addition, this implementation includes

            support for managing the zoom of the image browser. 

Version:    1.0

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*/

#import "AppDelegate.h"

@implementation AppDelegate

/*

    Returns the support folder for the application, used to store the Core Data store file.  This 

        code uses a folder named "IKImageBrowserViewWithCoreData" for the content, either in the

        NSApplicationSupportDirectory location or (if the former cannot be found), the system's 

        temporary directory.

*/

- (NSString *)applicationSupportFolder {

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

    NSString *basePath = ([paths count] > 0) ? [paths objectAtIndex:0] : NSTemporaryDirectory();

    return [basePath stringByAppendingPathComponent:@"IKImageBrowserViewWithCoreData"];

}

/*

    Creates, retains, and returns the managed object model for the application by merging all of the models 

        found in the application bundle.

*/

- (NSManagedObjectModel *)managedObjectModel {

    if (managedObjectModel) {

        return managedObjectModel;

    }

    managedObjectModel = [[NSManagedObjectModel mergedModelFromBundles:nil] retain];    

    return managedObjectModel;

}

/*

    Returns the persistent store coordinator for the application.  This implementation will create and 

        return a coordinator, having added the store for the application to it. (The folder for the 

        store is created, if necessary.)

*/

- (NSPersistentStoreCoordinator *) persistentStoreCoordinator {

    if (persistentStoreCoordinator) {

        return persistentStoreCoordinator;

    }

    NSError *error;

    NSFileManager *fileManager = [NSFileManager defaultManager];

    NSString *applicationSupportFolder = [self applicationSupportFolder];

    if (![fileManager fileExistsAtPath:applicationSupportFolder isDirectory:NULL]) {

        [fileManager createDirectoryAtPath:applicationSupportFolder attributes:nil];

    }

    NSURL *url = [NSURL fileURLWithPath:[applicationSupportFolder 

            stringByAppendingPathComponent:@"IKImageBrowserViewWithCoreData.xml"]];

    persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] 

            initWithManagedObjectModel:[self managedObjectModel]];

    if (![persistentStoreCoordinator addPersistentStoreWithType:NSXMLStoreType configuration:nil 

                URL:url options:nil error:&error]) {

        [[NSApplication sharedApplication] presentError:error];

    }    

    return persistentStoreCoordinator;

}

/*

    Returns the managed object context for the application (which is already bound to the persistent store 

        coordinator for the application.) 

*/

- (NSManagedObjectContext *)managedObjectContext {

    if (managedObjectContext) {

        return managedObjectContext;

    }

    NSPersistentStoreCoordinator *coordinator = [self persistentStoreCoordinator];

    if (coordinator) {

        managedObjectContext = [[NSManagedObjectContext alloc] init];

        [managedObjectContext setPersistentStoreCoordinator:coordinator];

    }

    return managedObjectContext;

}

/*

    Returns the NSUndoManager for the application.  In this case, the manager returned is that of the 

        managed object context for the application.

*/

- (NSUndoManager *)windowWillReturnUndoManager:(NSWindow *)window {

    return [[self managedObjectContext] undoManager];

}

/*

    Performs the save action for the application, which is to send the save: message to the application's

        managed object context.  Any encountered errors are presented to the user.

*/

- (IBAction)saveAction:(id)sender {

    NSError *error = nil;

    if (![[self managedObjectContext] save:&error]) {

        [[NSApplication sharedApplication] presentError:error];

    }

}

- (BOOL)applicationShouldTerminateAfterLastWindowClosed:(NSApplication *)theApplication {

    return YES;

}

/*

    Implementation of the applicationShouldTerminate: method, used here to handle the saving of 

        changes in the application managed object context before the application terminates.

*/

- (NSApplicationTerminateReply)applicationShouldTerminate:(NSApplication *)sender {

    NSError *error;

    int reply = NSTerminateNow;

    if (managedObjectContext) {

        if ([managedObjectContext commitEditing]) {

            if ([managedObjectContext hasChanges] && ![managedObjectContext save:&error]) {

                BOOL errorResult = [[NSApplication sharedApplication] presentError:error];

                if (errorResult == YES) {

                    reply = NSTerminateCancel;

                } else {

                    int alertReturn = NSRunAlertPanel(nil, @"Could not save changes while quitting. Quit anyway?" , @"Quit anyway", @"Cancel", nil);

                    if (alertReturn == NSAlertAlternateReturn) {

                        reply = NSTerminateCancel;  

                    }

                }

            }

        } else {

            reply = NSTerminateCancel;

        }

    }

    return reply;

}

/*

    Implementation of dealloc, to release the retained variables.

*/

- (void)dealloc {

    [managedObjectContext release], managedObjectContext = nil;

    [persistentStoreCoordinator release], persistentStoreCoordinator = nil;

    [managedObjectModel release], managedObjectModel = nil;

    [super dealloc];

}

#pragma mark Non-Template Code Below This Marker

/*

    Everything above this point is part of the standard Core Data Application template. The additions for

        the sample application are below. These include a property for the zoom value of the browser and

        an initial setting of that value. Both the browser and a slider are bound to the property.

*/

@synthesize browserZoom;

- (void)awakeFromNib {

    self.browserZoom = [NSNumber numberWithFloat:.5];

}

@end