/*

File: ImageClient.m

Abstract: CFNetwork ImageClient Sample

Version: 1.0

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

Computer, 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 Computer,

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) 2005 Apple Computer, Inc., All Rights Reserved

*/ 

#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);

}

/* Called by the two loaders to report an authentication failure */

- (void)authorizationNeededForRealm:(NSString *)realm onHost:(NSString *)host {

    [self stopTimer];

    [authPrompt setStringValue: [NSString stringWithFormat: @"Connect to %@ as", host]];

    [passField setStringValue: @""];

    [saveSwitch setState: NSOffState];

    // If we have a realm, we display it so the user knows where they are authenticating

    // If there is no realm, that means w

    if (realm) {

        [realmPrompt setStringValue: @"Realm"];

        [realmField setStringValue: realm];

        [accountDomainField setHidden: YES];

        [realmField setHidden: NO];

    } else {

        [realmPrompt setStringValue: @"Domain"];

        [accountDomainField setStringValue: @""];

        [accountDomainField setHidden: NO];

        [realmField setHidden: YES];

    }

    // Prompt the user

    [[NSApplication sharedApplication] beginSheet:authSheet modalForWindow:[urlField window] modalDelegate:self didEndSelector:@selector(authSheetDidEnd:returnCode:contextInfo:) contextInfo:nil];

}

- (IBAction)dismissAuthSheet:(id)sender {

    [[NSApplication sharedApplication] endSheet: authSheet returnCode: [(NSControl*)sender tag]];

}

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

    if (returnCode == NSOKButton) {

        // Resume the URL load

        [self startTimer];

        if (useCFNetworkLoader) {

            [cfnetworkLoader resumeWithCredentials];

        } else {

            [nsurlLoader resumeWithCredentials];

        }

    }

    [sheet orderOut: self];

}

// Called by the two loaders to get authorization information

- (NSString *)username {

    return [userField stringValue];

}

- (NSString *)password {

    return [passField stringValue];

}

- (NSString *)accountDomain {

    return [accountDomainField stringValue];

}

- (BOOL)saveCredentials {

    return (([saveSwitch state] == NSOnState) ? YES : NO);

}

@end