//
//  KBKeyboardLayoutEngine.h
//  CustomKeyboard
//
//  Layout metrics calculation helper.
//

#import <Foundation/Foundation.h>

@class KBKeyboardLayoutConfig;
@class KBKeyboardLayout;
@class KBKeyboardRowConfig;
@class KBKeyboardRowItem;
@class KBKeyboardKeyFactory;
@class KBKey;

NS_ASSUME_NONNULL_BEGIN

@interface KBKeyboardLayoutEngine : NSObject

- (instancetype)initWithLayoutConfig:(KBKeyboardLayoutConfig *)layoutConfig;

- (CGFloat)rowSpacingForLayout:(KBKeyboardLayout *)layout;
- (CGFloat)topInsetForLayout:(KBKeyboardLayout *)layout;
- (CGFloat)bottomInsetForLayout:(KBKeyboardLayout *)layout;

- (CGFloat)rowHeightForRow:(KBKeyboardRowConfig *)row;
- (CGFloat)gapForRow:(KBKeyboardRowConfig *)row;
- (CGFloat)insetLeftForRow:(KBKeyboardRowConfig *)row;
- (CGFloat)insetRightForRow:(KBKeyboardRowConfig *)row;

- (CGFloat)widthForItem:(KBKeyboardRowItem *)item key:(KBKey *)key;
- (CGFloat)fontSizeForItem:(KBKeyboardRowItem *)item key:(KBKey *)key;
- (CGFloat)fontSizeForFontKey:(NSString *)fontKey;

- (CGFloat)calculateUniformCharKeyWidthForRows:(NSArray<KBKeyboardRowConfig *> *)rows
                                    keyFactory:(KBKeyboardKeyFactory *)keyFactory
                                       shiftOn:(BOOL)shiftOn;

@end

NS_ASSUME_NONNULL_END