//
//  MPFunction.m
//  MathPad
//
//  Created by Kim Wittenburg on 18.04.14.
//  Copyright (c) 2014 Kim Wittenburg. All rights reserved.
//

#import "MPFunction.h"
#import "MPExpression.h"

@implementation MPFunction

#pragma mark Creation Methods

- (instancetype)init
{
    self = [super init];
    if (self) {
    }
    return self;
}

#pragma mark Working With the Expression Tree

- (void)childChanged:(MPExpression *)child atLocalIndexPath:(NSIndexPath *)indexPath
{
    [self.parent functionSymbolChanged:self
                      atLocalIndexPath:[indexPath indexPathByAddingIndex:0]];
}

- (NSUInteger)numberOfChildren
{
    return 0;
}

- (MPExpression *)childAtIndex:(NSUInteger)index
{
    return nil;
}

- (void)setChild:(MPExpression *)child
         atIndex:(NSUInteger)index
{}

#pragma mark Evaluating Functions

- (double)doubleValue
{
    return 0;
}

#pragma mark Working With Functions

- (BOOL)isEqual:(id)object
{
    if (self == object) {
        return YES;
    }
    if (object == nil) {
        return NO;
    }
    if (![object isKindOfClass:[MPFunction class]]) {
        return NO;
    }
    return [self isEqualToFunction:(MPFunction *)object];
}

- (BOOL)isEqualToFunction:(MPFunction *)aFunction
{
    return [aFunction isMemberOfClass:[MPFunction class]] && [self isMemberOfClass:[MPFunction class]];
}

#pragma mark - NSCopying

- (id)copyWithZone:(NSZone *)zone
{
    return [[MPFunction allocWithZone:zone] init];
}

#pragma mark - NSCoding

- (id)initWithCoder:(NSCoder *)aDecoder
{
    self = [super init];
    if (self) {
        
    }
    return self;
}

- (void)encodeWithCoder:(NSCoder *)aCoder
{}

@end

@implementation MPFunction (MPFunctionExtensionMethods)

#pragma mark Children

- (NSArray *)children
{
    NSUInteger childCount = [self numberOfChildren];
    NSMutableArray *children = [[NSMutableArray alloc] initWithCapacity:childCount];
    for (NSInteger i = 0; i < childCount; i++) {
        [children addObject:[self childAtIndex:i]];
    }
    return [children copy];
}

#pragma mark Evaluating Functions

- (float)floatValue
{
    return (float)[self doubleValue];
}

- (int)intValue
{
    return (int)[self doubleValue];
}

- (NSInteger)integerValue
{
    return (NSInteger)[self doubleValue];
}

- (long long)longLongValue
{
    return (long long)[self doubleValue];
}

- (NSString *)description
{
    return @"[]";
}

- (NSUInteger)hash
{
    return 0;
}

@end