//
//  MPMathRules.m
//  MathPad
//
//  Created by Kim Wittenburg on 14.09.14.
//  Copyright (c) 2014 Kim Wittenburg. All rights reserved.
//

#import "MPMathRules.h"

NSString *MPMathRulesAllowsImplicitMultiplicationKey = @"MPMathRulesAllowsImplicitMultiplicationKey";
NSString *MPMathRulesMaximumOperatorChainLengthKey = @"MPMathRulesMaximumOperatorChainLengthKey";
NSString *MPMathRulesMaximumOperatorChainLengthInMultiplicationKey = @"MPMathRulesMaximumOperatorChainLengthInMultiplicationKey";
NSString *MPMathRulesMaximumOperatorChainLengthInFunctionKey = @"MPMathRulesMaximumOperatorChainLengthInFunctionKey";

@implementation MPMathRules

static MPMathRules *sharedRules;

+ (MPMathRules *)sharedRules
{
    if (!sharedRules) {
        sharedRules = [[MPMathRules alloc] init];
    }
    return sharedRules;
}

- (instancetype)init
{
    if (sharedRules) {
        return sharedRules;
    }
    self = [super init];
    if (self) {
        _usingUserDefaultValues = YES;
        NSNumber *userDefaultsAllowImplicitMultiplication = [[NSUserDefaults standardUserDefaults] objectForKey:MPMathRulesAllowsImplicitMultiplicationKey];
        NSNumber *userDefaultsMaximumOperatorChainLength = [[NSUserDefaults standardUserDefaults] objectForKey:MPMathRulesMaximumOperatorChainLengthKey];
        NSNumber *userDefaultsMaximumOperatorChainLengthInMultiplication = [[NSUserDefaults standardUserDefaults] objectForKey:MPMathRulesMaximumOperatorChainLengthInMultiplicationKey];
        NSNumber *userDefaultsMaximumOperatorChainLengthInFunction = [[NSUserDefaults standardUserDefaults] objectForKey:MPMathRulesMaximumOperatorChainLengthInFunctionKey];
        
        _allowsImplicitMultiplication = userDefaultsAllowImplicitMultiplication != nil ? userDefaultsAllowImplicitMultiplication.boolValue : NO;
        _maximumOperatorChainLength = userDefaultsMaximumOperatorChainLength != nil ? userDefaultsMaximumOperatorChainLength.unsignedIntegerValue : 2;
        _maximumOperatorChainLengthInMultiplication = userDefaultsMaximumOperatorChainLengthInMultiplication != nil ? userDefaultsMaximumOperatorChainLengthInMultiplication.unsignedIntegerValue : 1;
        _maximumOperatorChainLengthInFunction = userDefaultsMaximumOperatorChainLengthInFunction != nil ? userDefaultsMaximumOperatorChainLengthInFunction.unsignedIntegerValue : 1;
    }
    return self;
}

- (void)setUsingUserDefaultValues:(BOOL)usingUserDefaultValues
{
    _usingUserDefaultValues = usingUserDefaultValues;
    // Save the current values
    self.allowsImplicitMultiplication = self.allowsImplicitMultiplication;
    self.maximumOperatorChainLength = self.maximumOperatorChainLength;
    self.maximumOperatorChainLengthInMultiplication = self.maximumOperatorChainLengthInMultiplication;
    self.maximumOperatorChainLengthInFunction = self.maximumOperatorChainLengthInFunction;
}

- (void)setAllowsImplicitMultiplication:(BOOL)allowsImplicitMultiplication
{
    _allowsImplicitMultiplication = allowsImplicitMultiplication;
    if (self.isUsingUserDefaultValues) {
        [[NSUserDefaults standardUserDefaults] setBool:allowsImplicitMultiplication
                                                forKey:MPMathRulesAllowsImplicitMultiplicationKey];
    }
}

- (void)setMaximumOperatorChainLength:(NSUInteger)maximumOperatorChainLength
{
    _maximumOperatorChainLength = maximumOperatorChainLength;
    if (self.isUsingUserDefaultValues) {
        [[NSUserDefaults standardUserDefaults] setObject:[NSNumber numberWithUnsignedInteger:maximumOperatorChainLength]
                                                  forKey:MPMathRulesMaximumOperatorChainLengthKey];
    }
}

- (void)setMaximumOperatorChainLengthInMultiplication:(NSUInteger)maximumOperatorChainLengthInMultiplication
{
    _maximumOperatorChainLengthInMultiplication = maximumOperatorChainLengthInMultiplication;
    if (self.isUsingUserDefaultValues) {
        [[NSUserDefaults standardUserDefaults] setObject:[NSNumber numberWithUnsignedInteger:maximumOperatorChainLengthInMultiplication]
                                                  forKey:MPMathRulesMaximumOperatorChainLengthInMultiplicationKey];
    }
}

- (void)setMaximumOperatorChainLengthInFunction:(NSUInteger)maximumOperatorChainLengthInFunction
{
    _maximumOperatorChainLengthInFunction = maximumOperatorChainLengthInFunction;
    if (self.isUsingUserDefaultValues) {
        [[NSUserDefaults standardUserDefaults] setObject:[NSNumber numberWithUnsignedInteger:maximumOperatorChainLengthInFunction]
                                                  forKey:MPMathRulesMaximumOperatorChainLengthInFunctionKey];
    }
}

@end