//
//  MPExpressionLayout.h
//  MathPad
//
//  Created by Kim Wittenburg on 22.04.14.
//  Copyright (c) 2014 Kim Wittenburg. All rights reserved.
//

#import <Foundation/Foundation.h>

@class MPExpressionLayout, MPFunctionLayout, MPExpressionStorage, MPExpression;

@interface MPExpressionLayout : NSObject {
    BOOL _valid;
    NSSize _cachedSize;
    NSMutableArray *_symbolCache;
}

#pragma mark Creation Methods

// -init not supported
- (id)initRootLayoutWithExpressionStorage:(MPExpressionStorage *)expressionStorage;
- (id)initWithExpressionPath:(NSIndexPath *)expressionPath
                      parent:(MPFunctionLayout *)parent;

#pragma mark Properties

@property (readonly, nonatomic, weak) MPFunctionLayout *parent;

@property (readonly, nonatomic, weak) MPExpressionStorage *expressionStorage;
@property (readonly, nonatomic, strong) NSIndexPath *expressionPath;

- (MPExpression *)expression; // Convenience
- (NSLayoutManager *)layoutManager;
- (NSTextContainer *)textContainer;
- (NSTextStorage *)textStorage;

#pragma mark Cache Methods

- (void)invalidate;
- (void)expressionEditedInRange:(NSRange)range
              replacementLength:(NSUInteger)length;

- (BOOL)hasCacheForSymbolAtIndex:(NSUInteger)index;
- (MPFunctionLayout *)functionLayoutForFunctionAtIndex:(NSUInteger)index;
- (NSSize)cachedSizeForSymbolAtIndex:(NSUInteger)index;
- (void)cacheSize:(NSSize)size forSymbolAtIndex:(NSUInteger)index;

#pragma mark Sizes Calculation Methods

- (NSSize)sizeForAllSymbols;
- (NSSize)sizeForSymbolAtIndex:(NSUInteger)index;
- (NSSize)sizeForSymbolsInRange:(NSRange)range;

#pragma mark Drawing Methods

- (void)drawSymbolAtIndex:(NSUInteger)index
                  atPoint:(NSPoint)point;
- (void)drawSymbolsInRange:(NSRange)range
                   atPoint:(NSPoint)point;
- (void)drawAllSymbolsAtPoint:(NSPoint)point;

@end