/*

     File: Level1ViewController.m

 Abstract: The application's level 1 view controller.

  Version: 1.3

 Disclaimer: IMPORTANT:  This Apple software is supplied to you by Apple

 Inc. ("Apple") in consideration of your agreement to the following

 terms, and your use, installation, modification or redistribution of

 this Apple software constitutes acceptance of these terms.  If you do

 not agree with these terms, please do not use, install, modify or

 redistribute this Apple software.

 In consideration of your agreement to abide by the following terms, and

 subject to these terms, Apple grants you a personal, non-exclusive

 license, under Apple's copyrights in this original Apple software (the

 "Apple Software"), to use, reproduce, modify and redistribute the Apple

 Software, with or without modifications, in source and/or binary forms;

 provided that if you redistribute the Apple Software in its entirety and

 without modifications, you must retain this notice and the following

 text and disclaimers in all such redistributions of the Apple Software.

 Neither the name, trademarks, service marks or logos of Apple Inc. may

 be used to endorse or promote products derived from the Apple Software

 without specific prior written permission from Apple.  Except as

 expressly stated in this notice, no other rights or licenses, express or

 implied, are granted by Apple herein, including but not limited to any

 patent rights that may be infringed by your derivative works or by other

 works in which the Apple Software may be incorporated.

 The Apple Software is provided by Apple on an "AS IS" basis.  APPLE

 MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION

 THE IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS

 FOR A PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND

 OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS.

 IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL

 OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

 INTERRUPTION) ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION,

 MODIFICATION AND/OR DISTRIBUTION OF THE APPLE SOFTWARE, HOWEVER CAUSED

 AND WHETHER UNDER THEORY OF CONTRACT, TORT (INCLUDING NEGLIGENCE),

 STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN ADVISED OF THE

 POSSIBILITY OF SUCH DAMAGE.

 Copyright (C) 2010 Apple Inc. All Rights Reserved.

 */

#import "AppDelegate.h"

#import "Level1ViewController.h"

#import "Level2ViewController.h"

@implementation Level1ViewController

@synthesize listContent, level2ViewController, myTableView;

- (void)dealloc

{

    [myTableView release];

    [listContent release];

    [level2ViewController release];

    [super dealloc];

}

- (void)awakeFromNib

{   

    self.title = @"Level 1";

}

#pragma mark UIViewController delegates

- (void)viewWillAppear:(BOOL)animated

{

    [myTableView reloadData];   // populate our table's data

    NSIndexPath *tableSelection = [myTableView indexPathForSelectedRow];

    [myTableView deselectRowAtIndexPath:tableSelection animated:NO];

}

#pragma mark UITableView delegates

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView

{

    return 1;

}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section

{

    return [listContent count];

}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath

{

    // save off this level's selection to our AppDelegate

    AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];

    [appDelegate.savedLocation replaceObjectAtIndex:0 withObject:[NSNumber numberWithInteger:indexPath.row]];

    [appDelegate.savedLocation replaceObjectAtIndex:1 withObject:[NSNumber numberWithInteger:-1]];

    [appDelegate.savedLocation replaceObjectAtIndex:2 withObject:[NSNumber numberWithInteger:-1]];

    // provide the 2nd level its content

    level2ViewController.listContent = [[listContent objectAtIndex:indexPath.row] objectForKey:kChildrenKey];

    // move to the 2nd level

    [[self navigationController] pushViewController:level2ViewController animated:YES];

    // commit the drill down location preference setting

    [[NSUserDefaults standardUserDefaults] setObject:appDelegate.savedLocation forKey:kRestoreLocationKey];

}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath

{

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:kCellIdentifier];

    if (cell == nil)

    {

        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:kCellIdentifier] autorelease];

        cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;

    }

    // get the view controller's info dictionary based on the indexPath's row

    NSDictionary* item = [listContent objectAtIndex:indexPath.row];

    cell.textLabel.text = [item objectForKey:kItemTitleKey];

    return cell;

}

// User was last at level 2 or deeper

//

// note: this is a part of 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.

//

- (void)restoreLevel:(NSArray*)items withSelectionArray:(NSArray *)selectionArray

{

    // user was last at level 2 or deeper

    //

    self.listContent = items;   // remember our content here at level 1 in case user navigates back to this level

    // move in level 2 and restore its content (not animated since the user should not see the restore process)

    [[self navigationController] pushViewController:level2ViewController animated:NO];

    // get the level 2 content

    NSInteger itemIdx = [[selectionArray objectAtIndex:0] integerValue];

    NSArray *itemContent = [[items objectAtIndex:itemIdx] objectForKey:kChildrenKey];

    // narrow down the selection array for level 2

    NSArray *newSelectionArray = [selectionArray subarrayWithRange:NSMakeRange(1, [selectionArray count]-1)];

    // restore that level

    [level2ViewController restoreLevel:itemContent withSelectionArray:newSelectionArray];

}

- (void)viewDidAppear:(BOOL)animated

{

    // we have moved to level 1, remove it's stored selection

    AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];

    [appDelegate.savedLocation replaceObjectAtIndex:0 withObject:[NSNumber numberWithInteger:-1]];

    // commit the drill down location preference setting

    [[NSUserDefaults standardUserDefaults] setObject:appDelegate.savedLocation forKey:kRestoreLocationKey];

}

@end