/*
 * Copyright [2023] [Doric.Pub]
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
//
//  DoricSliderNode.m
//  Doric
//
//  Created by jingpeng.wang on 2023/6/13.
//
#import "DoricSliderLayout.h"

@implementation DoricSliderLayout

- (NSArray<UICollectionViewLayoutAttributes *> *)layoutAttributesForElementsInRect:(CGRect)rect {
    NSArray *attributes = [super layoutAttributesForElementsInRect:rect];
    CGRect visitRect = {self.collectionView.contentOffset,self.collectionView.bounds.size};
    NSMutableArray *attributesCopy = [NSMutableArray array];
    for (UICollectionViewLayoutAttributes *attribute in attributes) {
        UICollectionViewLayoutAttributes *attributeCopy = [attribute copy];
        [attributesCopy addObject:attributeCopy];
    }
    
    for (UICollectionViewLayoutAttributes *attribute in attributesCopy) {
        CGFloat distance = CGRectGetMidX(visitRect) - attribute.center.x;
        float diff = fabs(distance);
        CATransform3D scaleTransform = CATransform3DIdentity;
        
        if (diff >= 0 && diff <= self.galleryItemWidth) {
            float scale = 1 - (1 - self.galleryMinScale) * (diff / self.galleryItemWidth);
            scaleTransform = CATransform3DMakeScale(scale, scale, scale);
            attribute.alpha = 1 - (1 - self.galleryMinAlpha) * (diff / self.galleryItemWidth);
        } else {
            float scale = self.galleryMinScale;
            scaleTransform = CATransform3DMakeScale(scale, scale, scale);
            attribute.alpha = self.galleryMinAlpha;
        }
        
        attribute.transform3D = scaleTransform;
    }
    return attributesCopy;
}

- (BOOL)shouldInvalidateLayoutForBoundsChange:(CGRect)newBounds {
    return YES;
}

@end