/*

     File: CAUITransportView.m

 Abstract: 

  Version: 1.1.2

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

 Inc. ("Apple") in consideration of your agreement to the following

 terms, and your use, installation, modification or redistribution of

 this Apple software constitutes acceptance of these terms.  If you do

 not agree with these terms, please do not use, install, modify or

 redistribute this Apple software.

 In consideration of your agreement to abide by the following terms, and

 subject to these terms, Apple grants you a personal, non-exclusive

 license, under Apple's copyrights in this original Apple software (the

 "Apple Software"), to use, reproduce, modify and redistribute the Apple

 Software, with or without modifications, in source and/or binary forms;

 provided that if you redistribute the Apple Software in its entirety and

 without modifications, you must retain this notice and the following

 text and disclaimers in all such redistributions of the Apple Software.

 Neither the name, trademarks, service marks or logos of Apple Inc. may

 be used to endorse or promote products derived from the Apple Software

 without specific prior written permission from Apple.  Except as

 expressly stated in 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 COMBINATION WITH YOUR PRODUCTS.

 IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL

 OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

 INTERRUPTION) ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION,

 MODIFICATION AND/OR DISTRIBUTION OF THE APPLE SOFTWARE, HOWEVER CAUSED

 AND WHETHER UNDER THEORY OF CONTRACT, TORT (INCLUDING NEGLIGENCE),

 STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN ADVISED OF THE

 POSSIBILITY OF SUCH DAMAGE.

 Copyright (C) 2014 Apple Inc. All Rights Reserved.

 */

#import "CAUITransportView.h"

NSString * const kTransportStateChangedNotificiation = @"kTransportStateChangedNotificiation";

@implementation CAUITransportView

{

    IBOutlet UILabel             *currentTime;

    IBOutlet CAUITransportButton *playPauseButton;

    IBOutlet CAUITransportButton *recordButton;

    IBOutlet CAUITransportButton *rewindButton;

    IBOutlet UIImageView         *hostIconView;

    UIImage                      *hostIcon;

    NSTimer                      *pollPlayerTimer;

    bool                         inForeground;

}

@synthesize engine = _engine;

#pragma mark Initialization/dealloc

- (void) awakeFromNib {

    rewindButton.drawingStyle    = rewindButtonStyle;

    playPauseButton.drawingStyle = pauseButtonStyle;

    recordButton.drawingStyle    = recordButtonStyle;

    rewindButton.fillColor       = [UIColor darkGrayColor].CGColor;

    playPauseButton.fillColor    = [UIColor darkGrayColor].CGColor;

    recordButton.fillColor       = [UIColor redColor].CGColor;

    UIApplicationState appstate = [UIApplication sharedApplication].applicationState;

    inForeground = (appstate != UIApplicationStateBackground);

    [[NSNotificationCenter defaultCenter] addObserver: self

                                             selector: @selector(appHasGoneInBackground)

                                                 name: UIApplicationDidEnterBackgroundNotification

                                               object: nil];

    [[NSNotificationCenter defaultCenter] addObserver: self

                                             selector: @selector(appHasGoneForeground)

                                                 name: UIApplicationWillEnterForegroundNotification

                                               object: nil];

    //Set touch listener on host icon

    UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(hostIconSelected:)];

    //Default value for cancelsTouchesInView is YES, which will prevent buttons to be clicked

    singleTap.cancelsTouchesInView = NO;

    [hostIconView addGestureRecognizer:singleTap];

}

- (void) dealloc

{

    if (_engine) 

        [((NSObject*)_engine) removeObserver:self forKeyPath:kTransportStateChangedNotificiation];

    [hostIcon release];

    [hostIconView release];

    [super dealloc];

}

- (void) setDelegateAddObserver: (id<CAUITransportEngine>)inDelegate {

    if (_engine != inDelegate) {

        if (_engine) 

            [((NSObject*)_engine) removeObserver:self forKeyPath:kTransportStateChangedNotificiation];

        [((NSObject*)_engine) release];

        _engine = (id)[((NSObject*)inDelegate) retain];

        [[NSNotificationCenter defaultCenter] addObserver: self

                                                 selector: @selector(updateTransportControls)

                                                     name: kTransportStateChangedNotificiation

                                                   object: _engine];

    }

}

#pragma mark IBActions

- (IBAction) togglePlayback:(id) sender {

    if (self.engine) {

        if (!self.engine.connected)

            displayAlertDialog(@"Error", @"Host not connected");

        else {

            [self.engine togglePlay];

            [self startPollingPlayer];

            [self updateTransportControls];

        }

    }

}

- (IBAction) toggleRecording:(id) sender {

    if (self.engine) {

        if (!self.engine.connected)

            displayAlertDialog(@"Error", @"Host not connected");

        else {

            [self.engine toggleRecord];

            [self updateTransportControls];

        }

    }

}

-(IBAction)rewindAction:(id)sender {

    if (self.engine) {

        if (!self.engine.connected)

            displayAlertDialog(@"Error", @"Host not connected");

        else {

            [self.engine rewind];

            [self updateTransportControls];

        }

    }

}

-(void)hostIconSelected:(UITapGestureRecognizer *)gesture {

    if (self.engine)

        [self.engine gotoHost];

}

#pragma mark Activation behavior

-(void) appHasGoneInBackground {

    inForeground = NO;

    [self stopPollingPlayer];

}

-(void) appHasGoneForeground {

    inForeground = YES;

    if (self.engine && [self.engine isHostPlaying])

        [self startPollingPlayer];

    else 

        [self stopPollingPlayer];

    [self updateTransportControls];

}

#pragma mark Control updating

- (void)updateTransportControls

{

    if (self.engine) {

        if ([self.engine isHostConnected]) {

            if (!hostIcon)

                hostIcon =  [self.engine getAudioUnitIcon];

            if (hostIcon) {

                hostIconView.userInteractionEnabled = YES;                 

                [hostIconView setImage:hostIcon];

                hostIconView.contentMode = UIViewContentModeCenter;

            }

            recordButton.drawingStyle    = [self.engine isHostRecording] ? recordEnabledButtonStyle : recordButtonStyle;

            playPauseButton.drawingStyle = [self.engine isHostPlaying]   ? pauseButtonStyle         : playButtonStyle;

            [recordButton setEnabled: [self.engine canRecord]];

            [currentTime setText: [self.engine getPlayTimeString]];

            self.hidden = NO;

        } else

            self.hidden = YES;

        [self setNeedsDisplay];

    }

}

-(void) startPollingPlayer {

    if (self.engine && [self.engine isHostConnected] && inForeground ) {

        if (!pollPlayerTimer) {

            pollPlayerTimer =  [NSTimer scheduledTimerWithTimeInterval: 0.05

                                                                target: self

                                                              selector: @selector(pollHost)

                                                              userInfo: nil

                                                               repeats: YES];

        }

    }

}

-(void)stopPollingPlayer {

    if (pollPlayerTimer) {

        [pollPlayerTimer invalidate];

        pollPlayerTimer = NULL;

    }

}

-(void) pollHost {

    if (self.engine){

        NSString *playTime = [self.engine getPlayTimeString];

        [currentTime setText:playTime];

    }

}

#pragma mark Utility functions

void displayAlertDialog(NSString *title, NSString *message)

{

    UIAlertView *alert = [[UIAlertView alloc] initWithTitle: title

                                                    message: message

                                                   delegate: nil

                                          cancelButtonTitle: @"OK"

                                          otherButtonTitles: nil];

    [alert show];

    [alert release];

    return;

}

@end