/*

File: ImageClient.m

Abstract: CFNetwork ImageClient Sample

Version: 1.0

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MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION

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*/ 

#import "ImageClient.h"

#import "CFNetworkLoader.h"

#import "NSURLLoader.h"

#import <sys/socket.h>

#import <netinet/in.h>

const int kCFNetworkIndex = 0;

const int kFoundationIndex = 1;

const NSTimeInterval kRefetchInterval = 15.0;

@implementation ImageClient

- (id)init {

    if (self = [super init]) {

        cfnetworkLoader = [[CFNetworkLoader alloc] initWithImageClient:self];

        nsurlLoader = [[NSURLLoader alloc] initWithImageClient:self];

        useCFNetworkLoader = YES;

        srandomdev(); // Seed the random number generator

    }

    return self;

}

// Included for form's sake; our ImageClient object will be around for as long as the app is running

- (void)dealloc {

    if (reloadTimer) {

        [reloadTimer invalidate];

        [reloadTimer release];

    }

    [cfnetworkLoader release];

    [nsurlLoader release];

    [super dealloc];

}

// Create and start the timer that triggers a refetch every few seconds

- (void)startTimer {

    [self stopTimer];

    reloadTimer = [NSTimer scheduledTimerWithTimeInterval:kRefetchInterval target:self selector:@selector(refetch:) userInfo:nil repeats:YES];

    [reloadTimer retain];

}

// Stop the timer; prevent future loads until startTimer is called again

- (void)stopTimer {

    if (reloadTimer) {

        [reloadTimer invalidate];

        [reloadTimer release];

        reloadTimer = nil;

    }

}

/* Called when the user enters a new URL in the textfield */

- (IBAction)newURL:(id)sender {

    // Clean up any loads in progress & restart the timer

    if (reloadTimer) {

        [self stopTimer];

        [self cancelLoad];

    }

    NSString *urlString = [urlField stringValue];

    if (urlString && [urlString length]) {

        [self startTimer];

        [self startLoad];

    }

}

/* Triggered when the user chooses a different library for loading */ 

- (IBAction)libraryChanged:(id)sender {

    NSSegmentedControl *segControl = sender;

    int selectedLibrary = [segControl selectedSegment];

    if ((selectedLibrary == kCFNetworkIndex && !useCFNetworkLoader) || (selectedLibrary == kFoundationIndex && useCFNetworkLoader)) {

        [self stopTimer];

        [self cancelLoad];

        useCFNetworkLoader = (selectedLibrary == kCFNetworkIndex);

        if ([urlField stringValue] && [[urlField stringValue] length]) {

            [self startTimer];

            [self startLoad];

        }

    }

}

/* The method called by our timer */

- (void)refetch:(NSTimer *)timer {

    [self startLoad];

}

/* Starting and stopping loads */

- (void)startLoad {

    // choose a random picture from among 100

    long randomNum = random();

    int index = randomNum % 100;

    NSURL *url = [[NSURL alloc] initWithString:[NSString stringWithFormat:@"%@/%d.JPG", [[urlField stringValue] stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]], index]];

    if (useCFNetworkLoader) {

        [cfnetworkLoader loadURL:url];

    } else {

        [nsurlLoader loadURL:url];

    }

    [url release];

}

- (void)cancelLoad {

    if (useCFNetworkLoader) {

        [cfnetworkLoader cancelLoad];

    } else {

        [nsurlLoader cancelLoad];

    }

    [imageView setImage:nil];

}

/* Called by the two loaders to report successful image loads */

- (void)setImageData:(NSData *)imageData {

    NSImage *image = [[NSImage alloc] initWithData:imageData];

    [imageView setImage:image];

    [image release];

}

/* Called by the two loaders to report errors while loading images */

- (void)errorOccurredLoadingImage: (CFNetDiagnosticRef)diagnostics {

    [self stopTimer];

    if (diagnostics) {

        NSBeginAlertSheet(@"Download failure", @"Network Diagnostics...", @"OK", nil, [imageView window], self, @selector(errorSheetDidEnd:returnCode:contextInfo:), NULL, (void*)diagnostics, @"Could not load an image from \"%@\"", [urlField stringValue]);

    } else {

        NSBeginAlertSheet(@"Download failure", @"OK", nil, nil, [imageView window], nil, NULL, NULL, NULL, @"Could not load an image from \"%@\"", [urlField stringValue]);

    }

}

// delegate call for the diagnostic sheet dropped in -errorOccurredLoadingImage:

- (void)errorSheetDidEnd:(NSWindow *)sheet returnCode:(int)returnCode contextInfo:(void *)contextInfo {

    CFNetDiagnosticRef diagnostics = (CFNetDiagnosticRef)contextInfo;

    if (returnCode == NSAlertDefaultReturn) {

        (void)CFNetDiagnosticDiagnoseProblemInteractively(diagnostics);

    }

    CFRelease(diagnostics);

}

@end