/*

     File: MainViewController.m

 Abstract: Responsible for all UI interactions with the user and the accelerometer

  Version: 2.6

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 */

#import "MainViewController.h"

#import "GraphView.h"

#import "AccelerometerFilter.h"

#define kUpdateFrequency    60.0

#define kLocalizedPause     NSLocalizedString(@"Pause","pause taking samples")

#define kLocalizedResume    NSLocalizedString(@"Resume","resume taking samples")

@interface MainViewController()

{

    AccelerometerFilter *filter;

    BOOL isPaused, useAdaptive;

}

@property (nonatomic, strong) IBOutlet GraphView *unfiltered;

@property (nonatomic, strong) IBOutlet GraphView *filtered;

@property (nonatomic, strong) IBOutlet UIBarButtonItem *pause;

@property (nonatomic, strong) IBOutlet UILabel *filterLabel;

- (IBAction)pauseOrResume:(id)sender;

- (IBAction)filterSelect:(id)sender;

- (IBAction)adaptiveSelect:(id)sender;

// Sets up a new filter. Since the filter's class matters and not a particular instance

// we just pass in the class and -changeFilter: will setup the proper filter.

- (void)changeFilter:(Class)filterClass;

@end

@implementation MainViewController

@synthesize unfiltered, filtered, pause, filterLabel;

// Implement viewDidLoad to do additional setup after loading the view.

- (void)viewDidLoad

{

    [super viewDidLoad];

    pause.possibleTitles = [NSSet setWithObjects:kLocalizedPause, kLocalizedResume, nil];

    isPaused = NO;

    useAdaptive = NO;

    [self changeFilter:[LowpassFilter class]];

    [[UIAccelerometer sharedAccelerometer] setUpdateInterval:1.0 / kUpdateFrequency];

    [[UIAccelerometer sharedAccelerometer] setDelegate:self];

    [unfiltered setIsAccessibilityElement:YES];

    [unfiltered setAccessibilityLabel:NSLocalizedString(@"unfilteredGraph", @"")];

    [filtered setIsAccessibilityElement:YES];

    [filtered setAccessibilityLabel:NSLocalizedString(@"filteredGraph", @"")];

}

// UIAccelerometerDelegate method, called when the device accelerates.

- (void)accelerometer:(UIAccelerometer *)accelerometer didAccelerate:(UIAcceleration *)acceleration

{

    // Update the accelerometer graph view

    if (!isPaused)

    {

        [filter addAcceleration:acceleration];

        [unfiltered addX:acceleration.x y:acceleration.y z:acceleration.z];

        [filtered addX:filter.x y:filter.y z:filter.z];

    }

}

- (void)changeFilter:(Class)filterClass

{

    // Ensure that the new filter class is different from the current one...

    if (filterClass != [filter class])

    {

        // And if it is, release the old one and create a new one.

        filter = [[filterClass alloc] initWithSampleRate:kUpdateFrequency cutoffFrequency:5.0];

        // Set the adaptive flag

        filter.adaptive = useAdaptive;

        // And update the filterLabel with the new filter name.

        filterLabel.text = filter.name;

    }

}

- (IBAction)pauseOrResume:(id)sender

{

    if (isPaused)

    {

        // If we're paused, then resume and set the title to "Pause"

        isPaused = NO;

        pause.title = kLocalizedPause;

    }

    else

    {

        // If we are not paused, then pause and set the title to "Resume"

        isPaused = YES;

        pause.title = kLocalizedResume;

    }

    // Inform accessibility clients that the pause/resume button has changed.

    UIAccessibilityPostNotification(UIAccessibilityLayoutChangedNotification, nil);

}

- (IBAction)filterSelect:(id)sender

{

    if ([sender selectedSegmentIndex] == 0)

    {

        // Index 0 of the segment selects the lowpass filter

        [self changeFilter:[LowpassFilter class]];

    }

    else

    {

        // Index 1 of the segment selects the highpass filter

        [self changeFilter:[HighpassFilter class]];

    }

    // Inform accessibility clients that the filter has changed.

    UIAccessibilityPostNotification(UIAccessibilityLayoutChangedNotification, nil);

}

- (IBAction)adaptiveSelect:(id)sender

{

    // Index 1 is to use the adaptive filter, so if selected then set useAdaptive appropriately

    useAdaptive = [sender selectedSegmentIndex] == 1;

    // and update our filter and filterLabel

    filter.adaptive = useAdaptive;

    filterLabel.text = filter.name;

    // Inform accessibility clients that the adaptive selection has changed.

    UIAccessibilityPostNotification(UIAccessibilityLayoutChangedNotification, nil);

}

@end