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#import "WaveformViewDemoView.h"

#import "WaveformViewDemo.h"

#pragma mark ____ LISTENER CALLBACK DISPATCHER ____

// This listener responds to parameter changes, gestures, and property notifications

void EventListenerDispatcher (void *inRefCon, void *inObject, const AudioUnitEvent *inEvent, UInt64 inHostTime, Float32 inValue)

{

    WaveformViewDemoView *SELF = (WaveformViewDemoView *)inRefCon;

    [SELF priv_eventListener:inObject event: inEvent value: inValue];

}

@implementation WaveformViewDemoView

#pragma mark ____ (INIT /) DEALLOC ____

- (void)dealloc {

    [self priv_removeListeners];

    if (mData) {

        free(mData);

        mData = NULL;

    }

    mAU = NULL;

    [super dealloc];

}

- (void) removeFromSuperview

{

    [mFetchTimer invalidate];

    //[[NSNotificationCenter defaultCenter] removeObserver: self];

    [super removeFromSuperview];

}

#pragma mark ____ PRIVATE FUNCTIONS ____

- (void) priv_initBuffers

{

    mData =(WaveformOverview*) malloc(sizeof(WaveformOverview) + (kMaxWaveformSamples-1)*sizeof(Float32));

    memset (&mData->mFetchStamp, 0, sizeof(AudioTimeStamp));

    mData->mFetchStamp.mFlags = kAudioTimeStampSampleTimeValid;

}

- (void)priv_addListeners 

{

    if (mAU) {

        verify_noerr( AUEventListenerCreate(EventListenerDispatcher, self,

                                            CFRunLoopGetCurrent(), kCFRunLoopDefaultMode, 0.05, 0.05, 

                                            &mAUEventListener));

    }

}

- (void)priv_removeListeners 

{

    if (mAUEventListener) verify_noerr (AUListenerDispose(mAUEventListener));

    mAUEventListener = NULL;

    mAU = NULL;

}

- (void)priv_synchronizeUIWithParameterValues {

}

#pragma mark ___OnTimer___

- (NSTimer *) timer {

    return [[mFetchTimer retain] autorelease];

}

- (void) setTimer: (NSTimer *) value {

    if ( mFetchTimer != value ) {

        [mFetchTimer release];

        mFetchTimer = [value retain];

    }

}

#pragma mark ____ PUBLIC FUNCTIONS ____

- (void) updateCurve:(NSTimer*) t

{   

    mData->mChannel = 0;

    Float64 tStamp;

    UInt32 size = sizeof(Float64);

    ComponentResult result = AudioUnitGetProperty(  mAU,

                                                    kAudioUnitProperty_SampleTimeStamp,

                                                    kAudioUnitScope_Global,

                                                    0,

                                                    &tStamp,

                                                    &size);

#pragma mark HOW MUCH TO DISPLAY

    SInt64 numToGet = (SInt64)(tStamp - mData->mFetchStamp.mSampleTime);

    if (numToGet == 0) return;

    if (numToGet > kMaxWaveformSamples)

        numToGet = kMaxWaveformSamples;

    mData->mNumDataPoints = numToGet;

    size = sizeof(WaveformOverview);

    result = AudioUnitGetProperty(                  mAU,

                                                    kAudioUnitProperty_WaveformOverview,

                                                    kAudioUnitScope_Global,

                                                    0,

                                                    mData,

                                                    &size);

    if (result == noErr && tStamp != 0){

        [uiWaveformView plotNum: numToGet dataPoints: mData->mOverview];    

    }

}

- (void)setAU:(AudioUnit)inAU {

    // remove previous listeners

    [self priv_initBuffers];

    if (mAU) [self priv_removeListeners];

    mAU = inAU;

    // add new listeners

    [self priv_addListeners];   

    // initial setup

    [self priv_synchronizeUIWithParameterValues];

    // register for resize notification and data changes

//  [[NSNotificationCenter defaultCenter]

//   addObserver: self selector: @selector(handleWaveformSizeChanged:) name: NSViewFrameDidChangeNotification  object: uiWaveformView];

    [self setTimer: [NSTimer scheduledTimerWithTimeInterval: (1.0/140.0)

                                             target: self

                                             selector: @selector(updateCurve:)

                                             userInfo: nil

                                            repeats: YES]]; 

}

#pragma mark ____ INTERFACE ACTIONS ____

- (void) handleWaveformSizeChanged:(NSNotification *) aNotification {

    [self updateCurve:nil];

}

#pragma mark ____ LISTENER CALLBACK DISPATCHEE ____

- (void)priv_parameterListener:(void *)inObject parameter:(const AudioUnitParameter *)inParameter value:(Float32)inValue {

    //inObject ignored in this case.

    switch (inParameter->mParameterID) {

    }

}

// Handle kAudioUnitProperty_PresentPreset event

- (void)priv_eventListener:(void *) inObject event:(const AudioUnitEvent *)inEvent value:(Float32)inValue {

    switch (inEvent->mEventType) {

    }

}

@end