/*

     File: MyViewController.mm

 Abstract: Main view controller for this sample.

  Version: 1.0

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 MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION

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 OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS.

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 */

#import "MyViewController.h"

#import "CaptureSessionController.h"

@interface MyViewController ()

@property (readonly, nonatomic) IBOutlet UIButton *startButton;

@property (readonly, nonatomic) IBOutlet UILabel *playbackText;

@property (nonatomic, strong) IBOutlet CaptureSessionController *captureSessionController;

- (IBAction)buttonAction:(id)sender;

@end

@implementation MyViewController

- (void)viewDidLoad

{

    [super viewDidLoad];

    // set up the start button

    // we've also set up different button titles in IB depending on state etc.

    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];

    [self.startButton setBackgroundImage:greenImage forState:UIControlStateNormal];

    [self.startButton setBackgroundImage:redImage forState:UIControlStateSelected];

}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation

{

    return (toInterfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);

}

- (void)viewWillAppear:(BOOL)animated

{

    [self registerForNotifications];

}

- (void)viewWillDisappear:(BOOL)animated

{

    [self unregisterForNotifications];

}

#pragma mark ======== Capture Session =========

- (void)initCaptureSession

{

    if ([self.captureSessionController setupCaptureSession]) {

        [self updateUISelected:NO enabled:YES];

    }

    else NSLog(@"Initializing CaptureSessionController failed just BAIL!");

}

// button starts and stops recording to the file

// capture session is running before button is enabled

- (IBAction)buttonAction:(id)sender

{

    if (self.captureSessionController.isRecording) {

        [self.captureSessionController stopRecording];

        [self updateUISelected:NO enabled:NO];

        [self playRecordedAudio];

    } else {

        [self.captureSessionController startRecording];

        [self updateUISelected:YES enabled:YES];

    }

}

- (void)updateUISelected:(BOOL)selected enabled:(BOOL)enabled

{

    self.startButton.selected = selected;

    self.startButton.enabled = enabled;

}

#pragma mark ======== AVAudioPlayer =========

// when interrupted, just toss the player and we're done

- (void)audioPlayerBeginInterruption:(AVAudioPlayer *)player

{

    NSLog(@"AVAudioPlayer audioPlayerBeginInterruption");

    [player setDelegate:nil];

    [player release];

    self.playbackText.hidden = YES;

}

// when finished, toss the player and restart the capture session

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

{

    (flag == NO) ? NSLog(@"AVAudioPlayer unsuccessfull!") :

                   NSLog(@"AVAudioPlayer finished playing");

    [player setDelegate:nil];

    [player release];

    self.playbackText.hidden = YES;

    // start the capture session

    [self.captureSessionController startCaptureSession];

}

// basic AVAudioPlayer implementation to play back recorded file

- (void)playRecordedAudio

{

    NSError *error = nil;

    // stop the capture session

    [self.captureSessionController stopCaptureSession];

    NSLog(@"Playing Recorded Audio");

    // play the result

    AVAudioPlayer *player = [[AVAudioPlayer alloc] initWithContentsOfURL:(NSURL *)self.captureSessionController.outputFile error:nil];

    if (nil == player) {

        NSLog(@"AVAudioPlayer alloc failed! %@", [error localizedDescription]);

        [self.startButton setTitle:@"FAIL!" forState:UIControlStateDisabled];

        return;

    } 

    self.playbackText.hidden = NO;

    [player setDelegate:self];

    [player play];

}

#pragma mark ======== Notifications =========

// notification handling to do the right thing when the app comes and goes

- (void)registerForNotifications

{    

    [[NSNotificationCenter defaultCenter] addObserver:self

                                             selector:@selector(willResignActive)

                                                 name:UIApplicationWillResignActiveNotification

                                               object:nil];

    [[NSNotificationCenter defaultCenter] addObserver:self

                                             selector:@selector(enableButton)

                                                 name:@"CaptureSessionRunningNotification"

                                               object:nil];

}

- (void)unregisterForNotifications

{

    [[NSNotificationCenter defaultCenter] removeObserver:self

                                                    name:UIApplicationWillResignActiveNotification

                                               object:nil];

    [[NSNotificationCenter defaultCenter] removeObserver:self

                                                 name:@"CaptureSessionRunningNotification"

                                               object:nil];

}

- (void)willResignActive

{

    NSLog(@"MyViewController willResignActive");

    [self updateUISelected:NO enabled:NO];

}

- (void)enableButton

{

    NSLog(@"MyViewController enableButton");

    [self updateUISelected:NO enabled:YES];

}

@end