/**
 * Copyright (c) 2016-present, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the root directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 */

#import "IGLayoutTestDataSource.h"

#import "IGLayoutTestItem.h"
#import "IGLayoutTestSection.h"

static NSString * const kCellIdentifier = @"cell";
static NSString * const kHeaderIdentifier = @"header";

@implementation IGLayoutTestDataSource

- (void)configCollectionView:(UICollectionView *)collectionView {
    [collectionView registerClass:[UICollectionViewCell class]
       forCellWithReuseIdentifier:kCellIdentifier];
    [collectionView registerClass:[UICollectionReusableView class]
       forSupplementaryViewOfKind:UICollectionElementKindSectionHeader
              withReuseIdentifier:kHeaderIdentifier];
}

#pragma mark - UICollectionViewDataSource

- (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView {
    return [self.sections count];
}

- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {
    return [self.sections[section].items count];
}

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
    return [collectionView dequeueReusableCellWithReuseIdentifier:kCellIdentifier forIndexPath:indexPath];
}

- (UICollectionReusableView *)collectionView:(UICollectionView *)collectionView viewForSupplementaryElementOfKind:(NSString *)kind atIndexPath:(NSIndexPath *)indexPath {
    return [collectionView dequeueReusableSupplementaryViewOfKind:UICollectionElementKindSectionHeader
                                              withReuseIdentifier:kHeaderIdentifier
                                                     forIndexPath:indexPath];
}

#pragma mark - UICollectionViewDelegateFlowLayout

- (UIEdgeInsets)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout insetForSectionAtIndex:(NSInteger)section {
    return self.sections[section].insets;
}

- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath {
    return self.sections[indexPath.section].items[indexPath.item].size;
}

- (CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout minimumLineSpacingForSectionAtIndex:(NSInteger)section {
    return self.sections[section].lineSpacing;
}

- (CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout minimumInteritemSpacingForSectionAtIndex:(NSInteger)section {
    return self.sections[section].interitemSpacing;
}

- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout referenceSizeForHeaderInSection:(NSInteger)section {
    return CGSizeMake(self.sections[section].headerHeight, self.sections[section].headerHeight); // Only the dimension along scrolling direction is used
}

@end