//
//  MPParenthesisFunction.m
//  MathPad
//
//  Created by Kim Wittenburg on 17.09.14.
//  Copyright (c) 2014 Kim Wittenburg. All rights reserved.
//

#import "MPParenthesisFunction.h"
#import "MPExpressionEvaluator.h"

@implementation MPParenthesisFunction

+ (NSString *)localizedFunctionName
{
    return NSLocalizedString(@"Parenthesis", @"Name of Parenthesis Function");
}

- (instancetype)init
{
    self = [super init];
    if (self) {
        _expression = [[MPExpression alloc] init];
        _expression.parent = self;
    }
    return self;
}

- (void)setExpression:(MPExpression *)expression
{
    _expression.parent = nil;
    _expression = expression;
    _expression.parent = self;
}

- (NSUInteger)numberOfChildren
{
    return 1;
}

- (MPExpression *)childAtIndex:(NSUInteger)index
{
    return index == 0 ? self.expression : nil;
}

- (void)setChild:(MPExpression *)child
         atIndex:(NSUInteger)index
{
    if (index == 0) {
        self.expression = child;
    }
}

- (NSArray *)children
{
    return @[self.expression];
}

- (MPTerm *)parseWithError:(MPParseError *__autoreleasing *)error
{
    MPExpressionEvaluator *evaluator = self.expression.evaluator;
    return [evaluator parseExpectingVariable:NO
                                       error:error];
}

- (NSDecimalNumber *)evaluateWithError:(MPParseError *__autoreleasing *)error
{
    return [self.expression evaluateWithError:error];
}

- (NSString *)description
{
    return [NSString stringWithFormat:@"(%@)", self.expression.description];
}

- (NSUInteger)hash
{
#warning Unimplemented Method
    return [super hash] * self.expression.hash;
}

- (id)copyWithZone:(NSZone *)zone
{
    MPParenthesisFunction *copy = [[MPParenthesisFunction allocWithZone:zone] init];
    copy.expression = self.expression.copy;
    return copy;
}

@end