/*

     File: MyViewController.m

 Abstract: 

  Version: 1.2

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 */

#import "MyViewController.h"

#define kTransitionDuration 0.75

extern void DoAQOfflineRender(CFURLRef sourceURL, CFURLRef destinationURL);

@implementation MyViewController

@synthesize instructionsView, webView, contentView, startButton, activityIndicator, flipButton, doneButton;

- (void)dealloc

{

    [flipButton release];

    [doneButton release];

    [destinationFilePath release];

    CFRelease(sourceURL);

    CFRelease(destinationURL);

    [super dealloc];

}

- (void)viewDidLoad

{   

    // create the URLs we'll use for source and destination

    NSString *source = [[NSBundle mainBundle] pathForResource:@"soundalac" ofType:@"caf"];

    sourceURL = CFURLCreateWithFileSystemPath(kCFAllocatorDefault, (CFStringRef)source, kCFURLPOSIXPathStyle, false);

    NSArray  *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);

    NSString *documentsDirectory = [paths objectAtIndex:0];

    destinationFilePath = [[NSString alloc] initWithFormat: @"%@/output.caf", documentsDirectory];

    destinationURL = CFURLCreateWithFileSystemPath(kCFAllocatorDefault, (CFStringRef)destinationFilePath, kCFURLPOSIXPathStyle, false);

    // load up the info text

    NSString *infoSouceFile = [[NSBundle mainBundle] pathForResource:@"info" ofType:@"html"];

    NSString *infoText = [NSString stringWithContentsOfFile:infoSouceFile encoding:NSUTF8StringEncoding error:nil];

    [self.webView loadHTMLString:infoText baseURL:nil];

    // set up start button

    UIImage *greenImage = [[UIImage imageNamed:@"green_button.png"] stretchableImageWithLeftCapWidth:12.0 topCapHeight:0.0];

    UIImage *redImage = [[UIImage imageNamed:@"red_button.png"] stretchableImageWithLeftCapWidth:12.0 topCapHeight:0.0];

    [startButton setBackgroundImage:greenImage forState:UIControlStateNormal];

    [startButton setBackgroundImage:redImage forState:UIControlStateDisabled];

    [startButton setEnabled:YES];

    // add the subview

    [self.view addSubview:contentView];

    // add our custom flip buttons as the nav bars custom right view

    UIButton* infoButton = [UIButton buttonWithType:UIButtonTypeInfoLight];

    [infoButton addTarget:self action:@selector(flipAction:) forControlEvents:UIControlEventTouchUpInside];

    flipButton = [[UIBarButtonItem alloc] initWithCustomView:infoButton];

    self.navigationItem.rightBarButtonItem = flipButton;

    // create our done button as the nav bar's custom right view for the flipped view (used later)

    doneButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(flipAction:)];

}

- (void)didReceiveMemoryWarning

{

    // Invoke super's implementation to do the Right Thing, but also release the input controller since we can do that  

    // In practice this is unlikely to be used in this application, and it would be of little benefit,

    // but the principle is the important thing.

    //

    [super didReceiveMemoryWarning];

}

#pragma mark- Actions

- (void)flipAction:(id)sender

{

    [UIView setAnimationDelegate:self];

    [UIView setAnimationDidStopSelector:@selector(animationDidStop:animationIDfinished:finished:context:)];

    [UIView beginAnimations:nil context:nil];

    [UIView setAnimationDuration:kTransitionDuration];

    [UIView setAnimationTransition:([self.contentView superview] ? UIViewAnimationTransitionFlipFromLeft : UIViewAnimationTransitionFlipFromRight)

                                    forView:self.view

                                    cache:YES];

    if ([self.instructionsView superview]) {

        [self.instructionsView removeFromSuperview];

        [self.view addSubview:contentView];

    } else {

        [self.contentView removeFromSuperview];

        [self.view addSubview:instructionsView];

    }

    [UIView commitAnimations];

    // adjust our done/info buttons accordingly

    if ([instructionsView superview]) {

        self.navigationItem.rightBarButtonItem = doneButton;

    } else {

        self.navigationItem.rightBarButtonItem = flipButton;

    }

}

- (IBAction)doSomethingAction:(id)sender

{

    [self.startButton setTitle:@"Rendering Audio..." forState:UIControlStateDisabled];

    [startButton setEnabled:NO];

    [self.activityIndicator startAnimating];

    // run AQ code in a background thread

    [self performSelectorInBackground:(@selector(renderAudio)) withObject:nil];

}

#pragma mark- AVAudioPlayer

- (void)audioPlayerDidFinishPlaying:(AVAudioPlayer *)player successfully:(BOOL)flag

{

    if (flag == NO) NSLog(@"Playback finished unsuccessfully!");

    [player setDelegate:nil];

    [player release];

    [startButton setEnabled:YES];

}

- (void)playAudio

{    

    // play the result

    AVAudioPlayer *player = [[AVAudioPlayer alloc] initWithContentsOfURL:(NSURL *)destinationURL error:nil];

    [player setDelegate:self];

    [player play];

}

#pragma mark- AudioQueue

- (void)renderAudio

{    

    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];

    // delete the previous output file if it exists, not required but good for the test

    if ([[NSFileManager defaultManager] fileExistsAtPath:destinationFilePath]) {

        [[NSFileManager defaultManager] removeItemAtPath:destinationFilePath error:nil];

    }

    DoAQOfflineRender(sourceURL, destinationURL);

    [self.activityIndicator stopAnimating];

    [self.startButton setTitle:@"Playing Rendered Audio..." forState:UIControlStateDisabled];

    [self performSelectorOnMainThread:(@selector(playAudio)) withObject:nil waitUntilDone:NO];

    [pool release];

}

@end