#import "CoreRecipesController.h"

@implementation CoreRecipesController

// Build the managed object model from the compiled data models in our bundle

- (NSManagedObjectModel *)managedObjectModel {

    if (managedObjectModel) return managedObjectModel;

    NSBundle *mainBundle = [NSBundle mainBundle];   

    managedObjectModel = [[NSManagedObjectModel mergedModelFromBundles:[NSArray arrayWithObject:mainBundle]] retain];

    return managedObjectModel;

}

// Return our managed object context, first setting up the persistence stack if needed

- (NSManagedObjectContext *)managedObjectContext {

    NSError *error;

    NSURL *url;

    NSPersistentStoreCoordinator *coordinator;

    if (managedObjectContext) {

        return managedObjectContext;

    }

    // This example uses a prepared store file which is in the app's bundle and is opened read-only

    NSBundle *mainBundle = [NSBundle mainBundle];

    NSString *storePath = [mainBundle pathForResource:@"CoreRecipesCocoaView" ofType:@"xml"];

    NSAssert(nil != storePath, @"No store file found in application bundle.");

    url = [NSURL fileURLWithPath:storePath];

    coordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel: [self managedObjectModel]];

    NSDictionary *storeOptionsDict = [NSDictionary dictionaryWithObject:[NSNumber numberWithBool:YES] forKey:NSReadOnlyPersistentStoreOption];

    if ([coordinator addPersistentStoreWithType:NSXMLStoreType configuration:nil URL:url options:storeOptionsDict error:&error]){

        managedObjectContext = [[NSManagedObjectContext alloc] init];

        [managedObjectContext setPersistentStoreCoordinator: coordinator];

    } else {

        [[NSApplication sharedApplication] presentError:error];

    }    

    [coordinator release];

    return managedObjectContext;

}

// Populate our array controller's array of recipes with all the recipes in the store

- (void)populateRecipes

{

    [recipes release];

    NSManagedObjectContext *context = [self managedObjectContext];

    NSFetchRequest *recipeFetch = [[[NSFetchRequest alloc] init] autorelease];

    NSEntityDescription *recipeEntity = [NSEntityDescription entityForName:@"Recipe" inManagedObjectContext:context];

    [recipeFetch setEntity:recipeEntity];

    NSError *fetchError;

    recipes = [NSMutableArray arrayWithArray:[context executeFetchRequest:recipeFetch error:&fetchError]];

    NSAssert(nil != recipes, ([NSString stringWithFormat:@"Recipe fetch returned error:%@", fetchError]));

    [recipes retain];

}

// TableView datasource methods

- (int)numberOfRowsInTableView:(NSTableView *)aTableView

{

    if (nil == recipes) {

        [self populateRecipes];

    }

    return [recipes count];

}

- (id)tableView:(NSTableView *)aTableView objectValueForTableColumn:(NSTableColumn *)aTableColumn row:(int)rowIndex

{

    if (nil == recipes) {

        [self populateRecipes];

    }

    id columnIdentifier = [aTableColumn identifier];

    NSAssert(rowIndex >= 0 && rowIndex < [recipes count], @"Invalid row index for tableview datasource");

    return [[recipes objectAtIndex:rowIndex] valueForKeyPath:columnIdentifier];

}

// Delete a recipe from our context

- (IBAction)deleteRecipe:(id)sender

{

    int selectedRow = [recipeTable selectedRow];

    if (-1 == selectedRow) { // No row selected

        NSBeep();

    } else {

        NSAssert(selectedRow >= 0 && selectedRow < [recipes count], @"Row selected in table view does not exist in recipes");

        NSManagedObject *recipeToDelete = [recipes objectAtIndex:selectedRow];

        [[self managedObjectContext] deleteObject:recipeToDelete];

        [recipes removeObjectAtIndex:selectedRow];

        [recipeTable reloadData];

    }

}

@end

/*

File: CoreRecipesController.m

Abstract: Main controller class for the application

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*/