/*

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

 See LICENSE.txt for this sample’s licensing information

 */

#import "AAPLFilterViewController.h"

#import "AAPLImageFilter.h"

@implementation AAPLFilterViewController

- (instancetype)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {

    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];

    if (self) {

        // any custom initialization

    }

    return self;

}

- (void)viewDidLoad {

    [super viewDidLoad];

    // decide if we want the "Done" button (for iPhone), iPad doesn't need one

    // for iPhone the presentingViewController is nil, for iPad it's a UINavigationController

    //

    if (self.presentingViewController != nil) {

        self.navigationBar.topItem.rightBarButtonItem = nil;

    }

}

- (void)viewWillAppear:(BOOL)animated {

    [super viewWillAppear:animated];

    [self update];

}

- (IBAction)dismiss:(id)sender {

    [self.presentingViewController dismissViewControllerAnimated:YES completion:^{

        // inform our delegate we are going away

        [self.delegate wasDismissed];

    }];

}

#pragma mark - Filtering

// blue slider value has changed

- (IBAction)setBlurValue:(id)sender {

    if ([self.filter isKindOfClass:[BlurFilter class]] && self.slider) {

        BlurFilter *filter = (BlurFilter *)self.filter;

        filter.blurRadius = self.slider.value;

        filter.dirty = YES;

    }

}

// sepia intensity slider value has changed

- (IBAction)setIntensity:(id)sender {

    if ([self.filter isKindOfClass:[ModifyFilter class]] && self.slider) {

        ModifyFilter *filter = (ModifyFilter *)self.filter;

        filter.intensity = self.slider.value;

        filter.dirty = YES;

    }

}

// active or on/off switch has changed

- (IBAction)setActiveValue:(id)sender {

    self.filter.active = self.activeSwitch.on;

    self.filter.dirty = YES;

    if (self.slider) {

        self.slider.enabled = self.filter.active;

    }

}

- (void)update {

    if (self.filter) {

        self.activeSwitch.on = self.filter.active;

        if ([self.filter isKindOfClass:[BlurFilter class]]) {

            BlurFilter *blurFilter = (BlurFilter *)self.filter;

            if (self.slider) {

                self.slider.value = blurFilter.blurRadius;

                self.slider.enabled = self.filter.active;

            }

        }

        if ([self.filter isKindOfClass:[ModifyFilter class]]) {

            ModifyFilter *modifyFilter = (ModifyFilter *)self.filter;

            if (self.slider) {

                self.slider.value = modifyFilter.intensity;

                self.slider.enabled = self.filter.active;

            }

        }

    }

}

#pragma mark - UIStateRestoration

#define kImageFilterKey @"kImageFilterKey"

- (void)encodeRestorableStateWithCoder:(NSCoder *)coder {

    [super encodeRestorableStateWithCoder:coder];

    [coder encodeObject:self.filter forKey:kImageFilterKey];

}

- (void)decodeRestorableStateWithCoder:(NSCoder *)coder {

    [super decodeRestorableStateWithCoder:coder];

    self.filter = [coder decodeObjectForKey:kImageFilterKey];

}

- (void)applicationFinishedRestoringState {

    [self update];

}

@end