/*

     File: AppDelegate.m

 Abstract: The application delegate class used for adding our navigation controller.

  Version: 1.3

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 */

#import "AppDelegate.h"

#import "Level1ViewController.h"

NSString *kItemTitleKey     = @"itemTitle";     // dictionary key for obtaining the item's title to display in each cell

NSString *kChildrenKey      = @"itemChildren";  // dictionary key for obtaining the item's children

NSString *kCellIdentifier   = @"MyIdentifier";  // the table view's cell identifier

NSString *kRestoreLocationKey = @"RestoreLocation"; // preference key to obtain our restore location

@implementation AppDelegate

@synthesize window, outlineData, navigationController, savedLocation;

- (id)init

{

    self = [super init];

    if (self)

    {

        // load the drill-down list content from the plist filem

        // this plist contains the outline mapping each level of the list hierarchy

        //

        NSString *path = [[NSBundle mainBundle] bundlePath];

        NSString *finalPath = [path stringByAppendingPathComponent:@"outline.plist"];

        outlineData = [[NSDictionary dictionaryWithContentsOfFile:finalPath] retain];

    }

    return self;

}

- (void)dealloc

{

    [navigationController release];  

    [window release];

    [outlineData release];

    [savedLocation release];

    [super dealloc];

}

- (void)applicationDidFinishLaunching:(UIApplication *)application

{

    // fetch the top level items in our outline (level 1)

    NSArray *topLevel1Content = [outlineData objectForKey:kChildrenKey];

    // give the top view controller its content

    ((Level1ViewController*)navigationController.topViewController).listContent = topLevel1Content;

    // load the stored preference of the user's last location from a previous launch

    NSMutableArray *tempMutableCopy = [[[NSUserDefaults standardUserDefaults] objectForKey:kRestoreLocationKey] mutableCopy];

    self.savedLocation = tempMutableCopy;

    [tempMutableCopy release];

    if (savedLocation == nil)

    {

        // user has not launched this app nor navigated to a particular level yet, start at level 1, with no selection

        savedLocation = [[NSMutableArray arrayWithObjects:

                          [NSNumber numberWithInteger:-1],  // item selection at 1st level (-1 = no selection)

                          [NSNumber numberWithInteger:-1],  // .. 2nd level

                          [NSNumber numberWithInteger:-1],  // .. 3rd level

                          nil] retain];

    }

    else

    {

        NSInteger selection = [[savedLocation objectAtIndex:0] integerValue];   // read the saved selection at level 1

        if (selection != -1)

        {

            // user was last at level 2 or deeper

            //

            // note: this starts a chain reaction down each level (2nd, 3rd, etc.)

            // so that each level restores itself and pushes further down until there's no further stored selections.

            //

            [(Level1ViewController*)navigationController.topViewController restoreLevel:topLevel1Content withSelectionArray:savedLocation];

        }

        else

        {

            // no saved selection, so user was at level 1 the last time

        }

    }

    // add the navigation controller's view to the window

    [window addSubview:[navigationController view]];

    [window makeKeyAndVisible];

    // register our preference selection data to be archived

    NSDictionary *savedLocationDict = [NSDictionary dictionaryWithObject:savedLocation forKey:kRestoreLocationKey];

    [[NSUserDefaults standardUserDefaults] registerDefaults:savedLocationDict];

    [[NSUserDefaults standardUserDefaults] synchronize];

}

@end