/*

     File: IconDownloader.m 

 Abstract: Helper object for managing the downloading of a particular app's icon.

 As a delegate "NSURLConnectionDelegate" is downloads the app icon in the background if it does not

 yet exist and works in conjunction with the AppListViewController to manage which apps need their icon.

 A simple BOOL tracks whether or not a download is already in progress to avoid redundant requests.

  Version: 1.1 

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 redistribute this Apple software. 

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

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

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

 MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION 

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 OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS. 

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 */

#import "IconDownloader.h"

#import "AppRecord.h"

#define kAppIconHeight 48

@implementation IconDownloader

@synthesize appRecord;

@synthesize indexPathInTableView;

@synthesize delegate;

@synthesize activeDownload;

@synthesize imageConnection;

#pragma mark

- (void)dealloc

{

    [appRecord release];

    [indexPathInTableView release];

    [activeDownload release];

    [imageConnection cancel];

    [imageConnection release];

    [super dealloc];

}

- (void)startDownload

{

    self.activeDownload = [NSMutableData data];

    // alloc+init and start an NSURLConnection; release on completion/failure

    NSURLConnection *conn = [[NSURLConnection alloc] initWithRequest:

                             [NSURLRequest requestWithURL:

                              [NSURL URLWithString:appRecord.imageURLString]] delegate:self];

    self.imageConnection = conn;

    [conn release];

}

- (void)cancelDownload

{

    [self.imageConnection cancel];

    self.imageConnection = nil;

    self.activeDownload = nil;

}

#pragma mark -

#pragma mark Download support (NSURLConnectionDelegate)

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data

{

    [self.activeDownload appendData:data];

}

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error

{

    // Clear the activeDownload property to allow later attempts

    self.activeDownload = nil;

    // Release the connection now that it's finished

    self.imageConnection = nil;

}

- (void)connectionDidFinishLoading:(NSURLConnection *)connection

{

    // Set appIcon and clear temporary data/image

    UIImage *image = [[UIImage alloc] initWithData:self.activeDownload];

    if (image.size.width != kAppIconHeight && image.size.height != kAppIconHeight)

    {

        CGSize itemSize = CGSizeMake(kAppIconHeight, kAppIconHeight);

        UIGraphicsBeginImageContext(itemSize);

        CGRect imageRect = CGRectMake(0.0, 0.0, itemSize.width, itemSize.height);

        [image drawInRect:imageRect];

        self.appRecord.appIcon = UIGraphicsGetImageFromCurrentImageContext();

        UIGraphicsEndImageContext();

    }

    else

    {

        self.appRecord.appIcon = image;

    }

    self.activeDownload = nil;

    [image release];

    // Release the connection now that it's finished

    self.imageConnection = nil;

    // call our delegate and tell it that our icon is ready for display

    [delegate appImageDidLoad:self.indexPathInTableView];

}

@end