/*

     File: RootViewController.m 

 Abstract: n/a 

  Version: 1.2 

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 MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION 

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*/

#import "AssetsDataIsInaccessibleViewController.h"

#import "AssetsList.h"

#import "FavoriteAssets.h"

#import "MapViewController.h"

#import "RootViewController.h"

@interface RootViewController ()

- (void)loadGroups;

@end

@implementation RootViewController

#pragma mark -

#pragma mark View lifecycle

-(void)viewDidAppear:(BOOL)animated

{

    [super viewDidAppear:animated];

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(assetsLibraryChanged:) name:ALAssetsLibraryChangedNotification object:nil];

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(favoriteAssetsChanged:) name:kFavoriteAssetsChanged object:nil];

    [self loadGroups];

}

- (void)loadGroups {

    if (!assetsLibrary) {

        assetsLibrary = [[ALAssetsLibrary alloc] init];

    }

    if (!groups) {

        groups = [[NSMutableArray alloc] init];

    } else {

        [groups removeAllObjects];

    }

    ALAssetsLibraryGroupsEnumerationResultsBlock listGroupBlock = ^(ALAssetsGroup *group, BOOL *stop) {

        if (group) {

            [groups addObject:group];

        } else {

            // Add the favorites group if it has any elements

            if (!favoriteAssets) {

                favoriteAssets = [[FavoriteAssets alloc] init];

            }

            if ([favoriteAssets count] > 0) {

                [groups addObject:favoriteAssets];

            }

            [self.tableView performSelectorOnMainThread:@selector(reloadData) withObject:nil waitUntilDone:NO];

        }

    };

    ALAssetsLibraryAccessFailureBlock failureBlock = ^(NSError *error) {

        AssetsDataIsInaccessibleViewController *assetsDataInaccessibleViewController = [[AssetsDataIsInaccessibleViewController alloc] initWithNibName:@"AssetsDataIsInaccessibleViewController" bundle:nil];

        NSString *errorMessage = nil;

        switch ([error code]) {

            case ALAssetsLibraryAccessUserDeniedError:

            case ALAssetsLibraryAccessGloballyDeniedError:

                errorMessage = @"The user has declined access to it.";

                break;

            default:

                errorMessage = @"Reason unknown.";

                break;

        }

        assetsDataInaccessibleViewController.explanation = errorMessage;

        [self presentViewController:assetsDataInaccessibleViewController animated:NO completion:nil];

        [assetsDataInaccessibleViewController release];

    };

    NSUInteger groupTypes = ALAssetsGroupAlbum | ALAssetsGroupEvent;

    [assetsLibrary enumerateGroupsWithTypes:groupTypes usingBlock:listGroupBlock failureBlock:failureBlock];

}

#pragma mark -

#pragma mark Table view data source

// Customize the number of sections in the table view.

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {

    return 1;

}

// Customize the number of rows in the table view.

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

    return ceil((float)groups.count / 2);

}

// Customize the appearance of table view cells.

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

    static NSString *CellIdentifier = @"Cell";

    AssetsGroupsTableViewCell *cell = (AssetsGroupsTableViewCell *)[tableView dequeueReusableCellWithIdentifier:CellIdentifier];

    if (cell == nil) {

        [[NSBundle mainBundle] loadNibNamed:@"AssetsGroupsTableViewCell" owner:self options:nil];

        cell = tmpCell;

        tmpCell = nil;

    }

    cell.rowNumber = indexPath.row;

    cell.selectionDelegate = self;

    // Configure the cell.

    NSUInteger leftGroupIndex = indexPath.row * 2;

    NSUInteger rightGroupIndex = leftGroupIndex + 1;

    ALAssetsGroup *leftGroup = [groups objectAtIndex:leftGroupIndex];

    ALAssetsGroup *rightGroup = (rightGroupIndex < groups.count) ? [groups objectAtIndex:rightGroupIndex] : nil;

    if (leftGroup) {

        CGImageRef posterImageRef = [leftGroup posterImage];

        UIImage *posterImage = [UIImage imageWithCGImage:posterImageRef];

        [cell setLeftPosterImage:posterImage];

        [cell setLeftLabelText:[leftGroup valueForProperty:ALAssetsGroupPropertyName]];

    }

    if (rightGroup) {

        CGImageRef posterImageRef = [rightGroup posterImage];

        UIImage *posterImage = [UIImage imageWithCGImage:posterImageRef];

        [cell setRightPosterImage:posterImage];

        [cell setRightLabelText:[rightGroup valueForProperty:ALAssetsGroupPropertyName]];

        [cell rightPosterImageView].userInteractionEnabled = YES;

    } else {

        [cell setRightLabelText:@""];

        [cell setRightPosterImage:nil];

        [cell rightPosterImageView].userInteractionEnabled = NO;

    }

    return cell;

}

#pragma mark -

#pragma mark AssetsGroupsTableViewCellSelectionDelegate

- (void)assetsGroupsTableViewCell:(AssetsGroupsTableViewCell *)cell selectedGroupAtIndex:(NSUInteger)index {

    MapViewController *mapViewController = [[MapViewController alloc] initWithNibName:@"MapViewController" bundle:nil];

    id objectAtRow = [groups objectAtIndex:(cell.rowNumber * 2) + index];

    AssetsList *assetsList = [objectAtRow assetsList];

    mapViewController.assetsList = assetsList;

    mapViewController.favoriteAssets = favoriteAssets;

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

    [mapViewController release];

}

#pragma mark -

#pragma mark Memory management

- (void)didReceiveMemoryWarning {

    // Releases the view if it doesn't have a superview.

    [super didReceiveMemoryWarning];

    // Relinquish ownership any cached data, images, etc that aren't in use.

}

- (void)viewWillDisappear:(BOOL)animated {

    [groups removeAllObjects];

    [[NSNotificationCenter defaultCenter] removeObserver:self name:ALAssetsLibraryChangedNotification object:nil];

    [[NSNotificationCenter defaultCenter] removeObserver:self name:kFavoriteAssetsChanged object:nil];

    [super viewWillDisappear:animated];

}

- (void)dealloc {

    [[NSNotificationCenter defaultCenter] removeObserver:self];

    [assetsLibrary release];

    [groups release];

    [favoriteAssets release];

    [super dealloc];

}

#pragma mark -

#pragma mark Change Notifications handlers

- (void)assetsLibraryChanged:(NSNotification *)notification {

    [self loadGroups];

}

- (void)favoriteAssetsChanged:(NSNotification *)notification {

    [self loadGroups];

}

@end