/*

 File: Controller.m

 Abstract: Controller manages the download of updates to the application.  It demonstrates the use of NSURLConnection and NSURLDownload.

 Version: 1.0

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

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 MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION

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 */ 

#import "Controller.h"

@implementation Controller

/* Preliminary Methods */

- (NSString *)versionString {

    return [[NSBundle mainBundle] objectForInfoDictionaryKey:(NSString *)kCFBundleVersionKey];

}

- (void)awakeFromNib {

    [versionField setStringValue:[self versionString]];

}

/* Action Methods */

- (void)checkForUpdates:(id)sender {

    if (!updateConnection && !updateDownload) {

        [self startUpdateConnection:[NSURL URLWithString:[NSString stringWithFormat:@"http://localhost:1234/Update?appversion=%@", [self versionString]]]];

    }

}

- (void)cancelUpdate:(id)sender {

    if (updateConnection) {

        [updateConnection cancel];

        [self endUpdateConnection];

    }

    if (updateDownload) {

        [updateDownload cancel];

        [self endUpdateDownload];

    }

}

/* Connection Management Methods */

- (void)startUpdateConnection:(NSURL *)url {

    NSURLRequest *connectionRequest = [NSURLRequest requestWithURL:url cachePolicy:NSURLRequestReloadIgnoringCacheData timeoutInterval:60.0];

    updateConnection = [[NSURLConnection alloc] initWithRequest:connectionRequest delegate:self];

    if (updateConnection) {

        connectionData = [[NSMutableData alloc] init];

        [progressField setStringValue:@"Connecting to server"];

        [progressIndicator setIndeterminate:YES];

        [progressIndicator startAnimation:nil];

        [progressPanel makeKeyAndOrderFront:nil];

    } else {

        [self endUpdateConnection];

        [self presentConnectionError];

    }

}

- (void)endUpdateConnection {

    [progressField setStringValue:@""];

    [progressIndicator stopAnimation:nil];

    [progressPanel orderOut:nil];

    [updateConnection release];

    updateConnection = nil;

    [connectionResponse release];

    connectionResponse = nil;

    [connectionData release];

    connectionData = nil;

}

- (BOOL)presentConnectionSuccess:(NSString *)name {

    BOOL retval = NO;

    if (name) {

        retval = (NSAlertDefaultReturn == NSRunAlertPanel(@"Update Available", @"The following update is available:  %@", @"Update", @"Cancel", nil, name));

    } else {

        NSRunAlertPanel(@"No Updates Available", @"Your application is up to date.", @"OK", nil, nil);

    }

    return retval;

}

- (void)presentConnectionError {

    NSRunAlertPanel(@"Unable to Connect", @"AutoUpdater was not able to connect to the update server.", @"OK", nil, nil);

}

/* NSURLConnection Delegate Methods */

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {

    [connectionResponse release];

    connectionResponse = [response retain];

    [connectionData setLength:0];

    [progressField setStringValue:@"Connected to server"];

}

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

    [connectionData appendData:data];

    [progressField setStringValue:@"Receiving data"];

}

- (void)connectionDidFinishLoading:(NSURLConnection *)connection {

    NSString *string = [[[NSString alloc] initWithData:connectionData encoding:NSUTF8StringEncoding] autorelease], *name = nil;

    NSURL *downloadURL = nil;

    [self endUpdateConnection];

    if (string && [string length] > 0) {

        downloadURL = [NSURL URLWithString:string];

        if (downloadURL) name = [[[downloadURL path] lastPathComponent] stringByDeletingPathExtension];

    }

    if ([self presentConnectionSuccess:name]) [self startUpdateDownload:downloadURL];

}

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

    [self endUpdateConnection];

    [self presentConnectionError];

}

- (NSCachedURLResponse *)connection:(NSURLConnection *)connection willCacheResponse:(NSCachedURLResponse *)cachedResponse {

    return nil;     // Never cache

}

/* Download Management Methods */

- (void)startUpdateDownload:(NSURL *)url {

    NSURLRequest *downloadRequest = [NSURLRequest requestWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:60.0];

    updateDownload = [[NSURLDownload alloc] initWithRequest:downloadRequest delegate:self];

    if (updateDownload) {

        downloadPath = [[NSString alloc] initWithString:@"/tmp/AutoUpdater.dmg"];

        [updateDownload setDestination:downloadPath allowOverwrite:YES];

        [progressField setStringValue:@"Connecting to server"];

        [progressIndicator setIndeterminate:YES];

        [progressIndicator startAnimation:nil];

        [progressPanel makeKeyAndOrderFront:nil];

    } else {

        [self endUpdateDownload];

        [self presentDownloadError];

    }

}

- (void)endUpdateDownload {

    [progressField setStringValue:@""];

    [progressIndicator stopAnimation:nil];

    [progressPanel orderOut:nil];

    [updateDownload release];

    updateDownload = nil;

    [downloadResponse release];

    downloadResponse = nil;

    [downloadPath release];

    downloadPath = nil;

}

- (void)presentDownloadSuccess {

    NSRunAlertPanel(@"Update Downloaded", @"The updated version of the application will be found on the newly opened AutoUpdater disk image.", @"OK", nil, nil);

}

- (void)presentDownloadError {

    NSRunAlertPanel(@"Unable to Download", @"AutoUpdater was not able to download the update from the server.", @"OK", nil, nil);

}

/* NSURLDownload Delegate Methods */

- (void)download:(NSURLDownload *)download didReceiveResponse:(NSURLResponse *)response {

    [downloadResponse release];

    downloadResponse = [response retain];

    downloadBytes = 0;

    [progressField setStringValue:@"Connected to server"];

}

- (void)download:(NSURLDownload *)download didReceiveDataOfLength:(unsigned)length {

    long long expectedLength = [downloadResponse expectedContentLength];

    float percentComplete;

    downloadBytes += length;

    if (expectedLength > 0) {

        percentComplete = ((float)downloadBytes / (float)expectedLength) * 100.0;

        [progressIndicator setIndeterminate:NO];

        [progressIndicator setDoubleValue:percentComplete];

    }

    [progressField setStringValue:@"Receiving data"];

}

- (void)downloadDidFinish:(NSURLDownload *)download {

    NSString *path = [NSString stringWithString:downloadPath];

    [self endUpdateDownload];

    if ([[NSWorkspace sharedWorkspace] openFile:path]) {

        [self presentDownloadSuccess];

    } else {

        [[NSFileManager defaultManager] removeFileAtPath:path handler:nil];

        [self presentDownloadError];

    }

}

- (void)download:(NSURLDownload *)download didFailWithError:(NSError *)error {

    [self endUpdateDownload];

    [self presentDownloadError];

}

@end