//
//  OTDownloadOperation.m
//  OperationTest
//
//  Created by Fraser Speirs on 04/05/2009.
//  Copyright 2009 Connected Flow. All rights reserved.
//

#import "OTDownloadOperation.h"

/*
 * This is a 'concurrent' download operation. It starts threads in the background.
 */
@implementation OTDownloadOperation

- (id)initWithURL:(NSURL *)url {
    if(self = [super init]) {
        downloadURL = [url retain];
        NSLog(@"Created download operation for URL: %@", [downloadURL absoluteString]);
        executing = NO;
        finished = NO;
    }
    return self;
}

- (void)start {
    [self willChangeValueForKey: @"isExecuting"];
    executing = YES;
    [self didChangeValueForKey: @"isExecuting"];
    data = [[NSMutableData data] retain];
    myConnection = [[NSURLConnection alloc] initWithRequest: [NSURLRequest requestWithURL: downloadURL] delegate: self startImmediately: YES];
}

- (BOOL)isConcurrent { return YES; }

- (BOOL)isExecuting { return executing; }

- (BOOL)isFinished { return finished; }

- (void)dealloc {
    [downloadURL release];
    [data release];
    [myConnection release];
    [super dealloc];
}

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)mdata {
    [data appendData: mdata];
}

- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
    NSLog(@"Finished (%@) %d bytes.", [downloadURL absoluteString], [data length]);
    [self updateCompletedState];
}

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
    NSLog(@"Failed (%@)", [downloadURL absoluteString]);
    [self updateCompletedState];
}

- (void)updateCompletedState {
    [self willChangeValueForKey: @"isExecuting"];
    executing = NO;
    [self didChangeValueForKey: @"isExecuting"];

    [self willChangeValueForKey: @"isFinished"];
    finished = YES;
    [self didChangeValueForKey: @"isFinished"];
}
@end