AudioPlayerManager.m

//
//  AudioPlayerManager.m
//  AudioPlayerManager
//
//  Created by Joshua Sierles on 15/04/15.
//  Copyright (c) 2015 Joshua Sierles. All rights reserved.
//

#import "AudioPlayerManager.h"
#import "RCTConvert.h"
#import "RCTBridge.h"
#import "RCTEventDispatcher.h"
#import <AVFoundation/AVFoundation.h>

NSString *const AudioPlayerEventProgress = @"playerProgress";
NSString *const AudioPlayerEventFinished = @"playerFinished";

@implementation AudioPlayerManager {
  
  AVAudioPlayer *_audioPlayer;

  NSTimeInterval _currentTime;
  id _progressUpdateTimer;
  int _progressUpdateInterval;
  NSDate *_prevProgressUpdateTime;
  NSURL *_audioFileURL;
}

@synthesize bridge = _bridge;

RCT_EXPORT_MODULE();

- (void)sendProgressUpdate {
  if (_audioPlayer && _audioPlayer.playing) {
    _currentTime = _audioPlayer.currentTime;
  }

  NSString *time = [NSString stringWithFormat:@"%f", _currentTime];

  if (_prevProgressUpdateTime == nil ||
   (([_prevProgressUpdateTime timeIntervalSinceNow] * -1000.0) >= _progressUpdateInterval)) {
      [_bridge.eventDispatcher sendDeviceEventWithName:AudioPlayerEventProgress body:@{
      @"currentTime": [NSNumber numberWithFloat:_currentTime]
    }];

    _prevProgressUpdateTime = [NSDate date];
  }
}

- (void)stopProgressTimer {
  [_progressUpdateTimer invalidate];
}

- (void)startProgressTimer {
  _progressUpdateInterval = 250;
  _prevProgressUpdateTime = nil;

  [self stopProgressTimer];

  _progressUpdateTimer = [CADisplayLink displayLinkWithTarget:self selector:@selector(sendProgressUpdate)];
  [_progressUpdateTimer addToRunLoop:[NSRunLoop mainRunLoop] forMode:NSDefaultRunLoopMode];
}

- (void)AudioPlayerDidFinishPlaying:(AVAudioPlayer *)recorder successfully:(BOOL)flag {
  NSLog(flag ? @"FINISHED OK" : @"FINISH ERROR");
  [_bridge.eventDispatcher sendDeviceEventWithName:AudioPlayerEventFinished body:@{
      @"finished": @TRUE
    }];
}

RCT_EXPORT_METHOD(play:(NSString *)path)
{
  NSError *error;

  NSString *resourcePath = [[NSBundle mainBundle] resourcePath];
  NSString *audioFilePath = [resourcePath stringByAppendingPathComponent:path];

  _audioFileURL = [NSURL fileURLWithPath:audioFilePath];

  NSLog([_audioFileURL absoluteString]);

  _audioPlayer = [[AVAudioPlayer alloc]
    initWithContentsOfURL:_audioFileURL
    error:&error];
  if (error) {
    [self stopProgressTimer];
    NSLog(@"audio playback loading error: %@", [error localizedDescription]);
    // TODO: dispatch error over the bridge
  } else {
    [self startProgressTimer];
    [_audioPlayer play];
  }
}

RCT_EXPORT_METHOD(pause)
{
  if (_audioPlayer.playing) {
    [_audioPlayer pause];
  }
}

RCT_EXPORT_METHOD(stop)
{
  if (_audioPlayer.playing) {
    [_audioPlayer stop];
  }
}

@end