//
//  MPFunctionLayout.m
//  MathPad
//
//  Created by Kim Wittenburg on 07.08.14.
//  Copyright (c) 2014 Kim Wittenburg. All rights reserved.
//

#import "MPFunctionLayout.h"
#import "MPFunction.h"
#import "MPExpressionLayout.h"

#import "MPSumFunction.h"
#import "MPSumFunctionLayout.h"

@implementation MPFunctionLayout

#pragma mark Creation Methods
+ (MPFunctionLayout *)functionLayoutForFunctionAtIndexPath:(NSIndexPath *)path
                                                    parent:(MPExpressionLayout *)parent
{
    MPFunction *function = [parent.expressionStorage elementAtIndexPath:path];
    Class class = [function class];
    if (class == [MPSumFunction class]) {
        return [[MPSumFunctionLayout alloc] initWithPath:path parent:parent];
    }
    return [[self alloc] initWithPath:path parent:parent];
}

#pragma mark Properties
- (MPFunction *)function
{
    return [self.expressionStorage elementAtIndexPath:self.path];
}

#pragma mark Cache Methods
- (MPLayout *)childLayoutAtIndex:(NSUInteger)index
{
    return [self cachableObjectForIndex:index generator:^id{
        NSIndexPath *childPath = [self.path indexPathByAddingIndex:index];
        MPExpressionLayout *layout = [[MPExpressionLayout alloc] initWithPath:childPath
                                                                       parent:self];
        return layout;
    }];
}

- (NSSize)sizeForChildAtIndex:(NSUInteger)index
{
    MPLayout *childLayout = [self childLayoutAtIndex:index];
    return [childLayout size];
}

- (NSBezierPath *)generateBezierPath
{
    return [NSBezierPath bezierPath];
}

@end