/*

    File:       SendController.m

    Contains:   Manages the Send tab.

    Written by: DTS

    Copyright:  Copyright (c) 2009-2012 Apple Inc. All Rights Reserved.

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

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                original Apple software (the "Apple Software"), to use,

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                following text and disclaimers in all such redistributions of

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                or logos of Apple Inc. may be used to endorse or promote

                products derived from the Apple Software without specific prior

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                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

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*/

#import "SendController.h"

#import "NetworkManager.h"

#import "QNetworkAdditions.h"

enum {

    kSendBufferSize = 32768

};

@interface SendController () <NSStreamDelegate>

// stuff for IB

@property (nonatomic, strong, readwrite) IBOutlet UILabel *                   statusLabel;

@property (nonatomic, strong, readwrite) IBOutlet UIActivityIndicatorView *   activityIndicator;

@property (nonatomic, strong, readwrite) IBOutlet UIButton *                  cancelButton;

- (IBAction)sendAction:(UIView *)sender;

- (IBAction)cancelAction:(id)sender;

// private properties

@property (nonatomic, assign, readonly ) BOOL               isSending;

@property (nonatomic, strong, readwrite) NSOutputStream *   networkStream;

@property (nonatomic, strong, readwrite) NSInputStream *    fileStream;

@property (nonatomic, assign, readonly ) uint8_t *          buffer;

@property (nonatomic, assign, readwrite) size_t             bufferOffset;

@property (nonatomic, assign, readwrite) size_t             bufferLimit;

@end

@implementation SendController

{

    uint8_t                     _buffer[kSendBufferSize];

}

@synthesize networkStream = _networkStream;

@synthesize fileStream    = _fileStream;

@synthesize bufferOffset  = _bufferOffset;

@synthesize bufferLimit   = _bufferLimit;

@synthesize statusLabel       = _statusLabel;

@synthesize activityIndicator = _activityIndicator;

@synthesize cancelButton      = _stopButton;

#pragma mark * Status management

// These methods are used by the core transfer code to update the UI.

- (void)sendDidStart

{

    self.statusLabel.text = @"Sending";

    self.cancelButton.enabled = YES;

    [self.activityIndicator startAnimating];

    [[NetworkManager sharedInstance] didStartNetworkOperation];

}

- (void)updateStatus:(NSString *)statusString

{

    assert(statusString != nil);

    self.statusLabel.text = statusString;

}

- (void)sendDidStopWithStatus:(NSString *)statusString

{

    if (statusString == nil) {

        statusString = @"Send succeeded";

    }

    self.statusLabel.text = statusString;

    self.cancelButton.enabled = NO;

    [self.activityIndicator stopAnimating];

    [[NetworkManager sharedInstance] didStopNetworkOperation];

}

#pragma mark * Core transfer code

// This is the code that actually does the networking.

// Because buffer is declared as an array, you have to use a custom getter.  

// A synthesised getter doesn't compile.

- (uint8_t *)buffer

{

    return self->_buffer;

}

- (BOOL)isSending

{

    return (self.networkStream != nil);

}

- (void)startSend:(NSString *)filePath

{

    NSOutputStream *    output;

    BOOL                success;

    NSNetService *      netService;

    assert(filePath != nil);

    assert(self.networkStream == nil);      // don't tap send twice in a row!

    assert(self.fileStream == nil);         // ditto

    // Open a stream for the file we're going to send.

    self.fileStream = [NSInputStream inputStreamWithFileAtPath:filePath];

    assert(self.fileStream != nil);

    [self.fileStream open];

    // Open a stream to the server, finding the server via Bonjour.  Then configure 

    // the stream for async operation.

    netService = [[NSNetService alloc] initWithDomain:@"local." type:@"_x-SNSUpload._tcp." name:@"Test"];

    assert(netService != nil);

    // Until <rdar://problem/6868813> is fixed, we have to use our own code to open the streams 

    // rather than call -[NSNetService getInputStream:outputStream:].  See the comments in 

    // QNetworkAdditions.m for the details.

    success = [netService qNetworkAdditions_getInputStream:NULL outputStream:&output];

    assert(success);

    self.networkStream = output;

    self.networkStream.delegate = self;

    [self.networkStream scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];

    [self.networkStream open];

    // Tell the UI we're sending.

    [self sendDidStart];

}

- (void)stopSendWithStatus:(NSString *)statusString

{

    if (self.networkStream != nil) {

        self.networkStream.delegate = nil;

        [self.networkStream removeFromRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];

        [self.networkStream close];

        self.networkStream = nil;

    }

    if (self.fileStream != nil) {

        [self.fileStream close];

        self.fileStream = nil;

    }

    self.bufferOffset = 0;

    self.bufferLimit  = 0;

    [self sendDidStopWithStatus:statusString];

}

- (void)stream:(NSStream *)aStream handleEvent:(NSStreamEvent)eventCode

    // An NSStream delegate callback that's called when events happen on our 

    // network stream.

{

    assert(aStream == self.networkStream);

    #pragma unused(aStream)

    switch (eventCode) {

        case NSStreamEventOpenCompleted: {

            [self updateStatus:@"Opened connection"];

        } break;

        case NSStreamEventHasBytesAvailable: {

            assert(NO);     // should never happen for the output stream

        } break;

        case NSStreamEventHasSpaceAvailable: {

            [self updateStatus:@"Sending"];

            // If we don't have any data buffered, go read the next chunk of data.

            if (self.bufferOffset == self.bufferLimit) {

                NSInteger   bytesRead;

                bytesRead = [self.fileStream read:self.buffer maxLength:kSendBufferSize];

                if (bytesRead == -1) {

                    [self stopSendWithStatus:@"File read error"];

                } else if (bytesRead == 0) {

                    [self stopSendWithStatus:nil];

                } else {

                    self.bufferOffset = 0;

                    self.bufferLimit  = bytesRead;

                }

            }

            // If we're not out of data completely, send the next chunk.

            if (self.bufferOffset != self.bufferLimit) {

                NSInteger   bytesWritten;

                bytesWritten = [self.networkStream write:&self.buffer[self.bufferOffset] maxLength:self.bufferLimit - self.bufferOffset];

                assert(bytesWritten != 0);

                if (bytesWritten == -1) {

                    [self stopSendWithStatus:@"Network write error"];

                } else {

                    self.bufferOffset += bytesWritten;

                }

            }

        } break;

        case NSStreamEventErrorOccurred: {

            [self stopSendWithStatus:@"Stream open error"];

        } break;

        case NSStreamEventEndEncountered: {

            // ignore

        } break;

        default: {

            assert(NO);

        } break;

    }

}

#pragma mark * Actions

- (IBAction)sendAction:(UIView *)sender

{

    assert( [sender isKindOfClass:[UIView class]] );

    if ( ! self.isSending ) {

        NSString *  filePath;

        // Use the tag on the button to determine which image to send.

        filePath = [[NetworkManager sharedInstance] pathForTestImage:sender.tag];

        assert(filePath != nil);

        [self startSend:filePath];

    }

}

- (IBAction)cancelAction:(id)sender

{

    #pragma unused(sender)

    [self stopSendWithStatus:@"Cancelled"];

}

#pragma mark * View controller boilerplate

- (void)viewDidLoad

{

    [super viewDidLoad];

    assert(self.statusLabel != nil);

    assert(self.activityIndicator != nil);

    assert(self.cancelButton != nil);

    self.activityIndicator.hidden = YES;

    self.statusLabel.text = @"Tap a picture to start the send";

    self.cancelButton.enabled = NO;

}

- (void)viewDidUnload

{

    [super viewDidUnload];

    self.statusLabel = nil;

    self.activityIndicator = nil;

    self.cancelButton = nil;

}

- (void)dealloc

{

    [self stopSendWithStatus:@"Stopped"];

}

@end