/*

     File: MapViewController.m 

 Abstract: n/a 

  Version: 1.2 

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*/

#import "AssetsDataIsInaccessibleViewController.h"

#import "AssetViewController.h"

#import "CrumbPath.h"

#import "CrumbPathView.h"

#import "FavoriteAssets.h"

#import "MapAnnotation.h"

#import "MapViewController.h"

#import <QuartzCore/QuartzCore.h>

static UIEdgeInsets pinPadding = { 64.f, 64.f, 64.f, 64.f };

@interface MapViewController()

- (void)dropPins;

@end

@implementation MapViewController

@synthesize assetsList;

@synthesize favoriteAssets;

@synthesize map;

- (void)viewDidLoad {

    loadPinsData = YES;

}

- (void)viewDidAppear:(BOOL)animated {

    [super viewDidAppear:animated];

    self.title = assetsList.title;

    [map setDelegate:self];

    if (!loadPinsData) {

        return;

    }

    if (!annotations) {

        annotations = [[NSMutableArray alloc] init];

    } else {

        [annotations removeAllObjects];

    }

    ALAssetsGroupEnumerationResultsBlock enumerationBlock = ^(ALAsset *asset, NSUInteger index, BOOL *stop) {

        if (!asset) {

            loadPinsData = NO;

            [self performSelectorOnMainThread:@selector(dropPins) withObject:nil waitUntilDone:NO];

        } else {

            CLLocation *assetLocation = [asset valueForProperty:ALAssetPropertyLocation];

            if (CLLocationCoordinate2DIsValid([assetLocation coordinate])) {

                MapAnnotation *mapAnnotation = [[MapAnnotation alloc] initWithAsset:asset];

                [annotations addObject:mapAnnotation];

                [mapAnnotation release];

            }

        }

    };

    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];

    };

    [assetsList loadAssets:enumerationBlock failureBlock:failureBlock];

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

}

- (void)viewWillDisappear:(BOOL)animated {

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

    [self.map setDelegate:nil];

    [super viewWillDisappear:animated];

}

#pragma mark -

#pragma mark MapViewDelegate implementation

- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation {

    MKPinAnnotationView *pinAnnotationView = (MKPinAnnotationView *)[mapView dequeueReusableAnnotationViewWithIdentifier:@"mapAnnotation"];

    if (pinAnnotationView) {

        [pinAnnotationView prepareForReuse];

    } else {

        pinAnnotationView = [[[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:@"mapAnnotation"] autorelease];

    }

    pinAnnotationView.canShowCallout = YES;

    CGImageRef thumbnailImageRef = [[(MapAnnotation *)annotation annotationAsset] thumbnail];

    UIImage *thumbnail = [UIImage imageWithCGImage:thumbnailImageRef];

    UIImageView *thumbnailImageView = [[UIImageView alloc] initWithImage:thumbnail];

    CGRect newBounds = CGRectMake(0.0, 0.0, 32.0, 32.0);

    [thumbnailImageView setBounds:newBounds];

    pinAnnotationView.leftCalloutAccessoryView = thumbnailImageView;

    [thumbnailImageView release];

    UIButton *disclosureButton = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];

    pinAnnotationView.rightCalloutAccessoryView = disclosureButton;

    [disclosureButton addTarget:self action:@selector(showFullSizeImage:) forControlEvents:UIControlEventTouchUpInside];

    return pinAnnotationView;

}

- (void)showFullSizeImage:(id)sender {

    MapAnnotation *annotation = [[map selectedAnnotations] objectAtIndex:0];

    AssetViewController *assetViewController = [[AssetViewController alloc] initWithNibName:@"AssetViewController" bundle:nil];

    assetViewController.asset = annotation.annotationAsset;

    assetViewController.favoriteAssets = favoriteAssets;

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

    [assetViewController release];

}

#pragma mark -

#pragma mark Map Animations

- (void)dropPins {

    [map removeAnnotations:[map annotations]];

    [map removeOverlays:[map overlays]];

    [crumbPath release];

    crumbPath = nil;

    [crumbPathView release];

    crumbPathView = nil;

    [annotations sortUsingSelector:@selector(compareByDate:)];

    MKMapRect boundingRect = MKMapRectNull;

    NSUInteger i = 0;

    for (MKPointAnnotation *point in annotations) {

        MKMapPoint mp = MKMapPointForCoordinate(point.coordinate);

        MKMapRect pRect = MKMapRectMake(mp.x, mp.y, 0, 0);

        if (i == 0) {

            boundingRect = pRect;

        } else {

            boundingRect = MKMapRectUnion(boundingRect, pRect);

        }        

        i++;

    }

    [map setVisibleMapRect:boundingRect edgePadding:pinPadding animated:NO];

    [map addAnnotations:annotations];

}

- (void)bringToFrontAnnotationAtIndex:(NSUInteger)annotationIndex {

    MKPinAnnotationView *previousAnnotation = (id)( annotationIndex > 0 ? [map viewForAnnotation:[annotations objectAtIndex:annotationIndex - 1]] : nil);

    MKPinAnnotationView *currentAnnotation = (id)[map viewForAnnotation:[annotations objectAtIndex:annotationIndex]];

    previousAnnotation.layer.zPosition = 0;

    currentAnnotation.layer.zPosition = 1;

}

- (void)goToFirstPin {

    if (![annotations count])

        return;

    currentPointIndex = 0;

    MKPointAnnotation *first = [annotations objectAtIndex:0];

    [self bringToFrontAnnotationAtIndex:0];

    crumbPath = [[CrumbPath alloc] initWithCenterCoordinate:first.coordinate];

    [map addOverlay:crumbPath];

    MKCoordinateRegion region = MKCoordinateRegionMakeWithDistance(first.coordinate, 2000, 2000);

    goingToPoint = YES;

    [map setRegion:region animated:YES];

}

- (void)goToNextPin {

    currentPointIndex++;

    if (currentPointIndex == [annotations count]) {

        return;

    }

    MapAnnotation *point = [annotations objectAtIndex:currentPointIndex];

    [self bringToFrontAnnotationAtIndex:currentPointIndex];

    MKMapRect updateRect = [crumbPath addCoordinate:point.coordinate];

    if (!MKMapRectIsNull(updateRect)) {

        MKMapRect currentRect = map.visibleMapRect;

        MKMapRect currentCenterRect = MKMapRectMake(MKMapRectGetMidX(currentRect), MKMapRectGetMidY(currentRect), 0, 0);

        MKMapPoint newCenterPoint = MKMapPointForCoordinate(point.coordinate);

        MKMapRect newCenterRect = MKMapRectMake(newCenterPoint.x, newCenterPoint.y, 0, 0);

        MKMapRect newRect = MKMapRectUnion(currentCenterRect, newCenterRect);

        goingToPoint = YES;

        [crumbPathView setNeedsDisplay];

        [map setVisibleMapRect:newRect edgePadding:pinPadding animated:YES];

    } else {

        // no coordinate change, go straight to the next point

        [self goToNextPin];

    }

}

- (void)mapView:(MKMapView *)mapView regionDidChangeAnimated:(BOOL)animated {

    if (goingToPoint) {

        goingToPoint = NO;

        [self performSelector:@selector(goToNextPin) withObject:nil afterDelay:0.3];

    }

}

- (MKOverlayView *)mapView:(MKMapView *)mapView viewForOverlay:(id <MKOverlay>)overlay {

    if (!crumbPathView)

        crumbPathView = [[CrumbPathView alloc] initWithOverlay:overlay];

    return crumbPathView;

}

- (void)drawAnimatedPathBetweenPins:(id)sender {

    [self performSelector:@selector(goToFirstPin) withObject:nil afterDelay:0.0];

}

#pragma mark -

#pragma mark Notification handlers

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

    loadPinsData = YES;

}

#pragma mark -

#pragma mark Memory management

- (void)didReceiveMemoryWarning {

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

    [super didReceiveMemoryWarning];

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

}

- (void)dealloc {

    self.assetsList = nil;

    self.favoriteAssets = nil;

    [crumbPathView release];

    [crumbPath release];

    [annotations release];

    [super dealloc];

}

@end