/**
 Copyright (c) 2014-present, Facebook, Inc.
 All rights reserved.
 
 This source code is licensed under the BSD-style license found in the
 LICENSE file in the root directory of this source tree. An additional grant
 of patent rights can be found in the PATENTS file in the same directory.
 */

#import "MPTweak.h"

@implementation MPTweak {
    NSHashTable *_observers;
}

- (instancetype)initWithName:(NSString *)name andEncoding:(NSString *)encoding
{
    if ((self = [super init])) {
        _name = name;
        _encoding = encoding;
    }
    return self;
}

- (void)setCurrentValue:(MPTweakValue)currentValue
{
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wstrict-selector-match"
    if (_minimumValue != nil && currentValue != nil && [_minimumValue compare:currentValue] == NSOrderedDescending) {
        currentValue = _minimumValue;
    }
    
    if (_maximumValue != nil && currentValue != nil && [_maximumValue compare:currentValue] == NSOrderedAscending) {
        currentValue = _maximumValue;
    }
#pragma clang diagnostic pop
    
    if (_currentValue != currentValue) {
        _currentValue = currentValue;
        for (id<MPTweakObserver> observer in [_observers setRepresentation]) {
            [observer tweakDidChange:self];
        }
    }
}

- (void)addObserver:(id<MPTweakObserver>)observer
{
    if (_observers == nil) {
        _observers = [NSHashTable weakObjectsHashTable];
    }
    
    NSAssert(observer != nil, @"observer is required");
    [_observers addObject:observer];
}

- (void)removeObserver:(id<MPTweakObserver>)observer
{
    NSAssert(observer != nil, @"observer is required");
    [_observers removeObject:observer];
}

@end