keyboard/keyBoard/Class/Shop/VC/KBShopItemVC.m

//
//  KBShopItemVC.m
//  keyBoard
//
//  Created by Mac on 2025/11/9.
//

#import "KBShopItemVC.h"
#import <MJRefresh/MJRefresh.h>
#import <Masonry/Masonry.h>
#import "KBSkinCardCell.h"

@interface KBShopItemVC ()<UICollectionViewDataSource, UICollectionViewDelegateFlowLayout>
@property (nonatomic, copy) void(^scrollCallback)(UIScrollView *scrollView);
@end

@implementation KBShopItemVC

- (void)viewDidLoad {
    [super viewDidLoad];
    self.view.backgroundColor = [UIColor clearColor];

    // 懒加载 collectionView，并添加到视图
    [self.view addSubview:self.collectionView];
    [self.collectionView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.edges.equalTo(self.view); // mas 布局：铺满
    }];

    // 刷新组件（演示：2 秒后结束）
    KBWeakSelf
    if (self.isNeedHeader) {
        self.collectionView.mj_header = [MJRefreshNormalHeader headerWithRefreshingBlock:^{
            dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(2 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
                [weakSelf.collectionView.mj_header endRefreshing];
            });
        }];
    }
    if (self.isNeedFooter) {
        self.collectionView.mj_footer = [MJRefreshAutoNormalFooter footerWithRefreshingBlock:^{
            dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(2 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
                [weakSelf.dataSource addObject:@"加载更多成功"]; // 模拟新增一条
                [weakSelf.collectionView reloadData];
                [weakSelf.collectionView.mj_footer endRefreshing];
            });
        }];
    }

    if (@available(iOS 11.0, *)) {
        self.collectionView.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentNever;
    }

    [self beginFirstRefresh];
}

#pragma mark - 刷新控制

// 首次进入自动触发一次刷新（如果需要）
- (void)beginFirstRefresh {
    if (!self.isHeaderRefreshed) {
        [self beginRefreshImmediately];
    }
}

- (void)beginRefreshImmediately {
    if (self.isNeedHeader) {
        [self.collectionView.mj_header beginRefreshing];
        dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(2 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
            self.isHeaderRefreshed = YES;
            [self.collectionView reloadData];
            [self.collectionView.mj_header endRefreshing];
        });
    } else {
        self.isHeaderRefreshed = YES;
        [self.collectionView reloadData];
    }
}

#pragma mark - UICollectionView DataSource

- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {
    if (!self.isHeaderRefreshed) return 0;
    return self.dataSource.count;
}

- (__kindof UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
    KBSkinCardCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"KBSkinCardCell" forIndexPath:indexPath];
    NSString *title = (indexPath.item < self.dataSource.count) ? self.dataSource[indexPath.item] : @"Dopamine";
    [cell configWithTitle:title imageURL:nil price:@"20"]; // 价格写死 20（演示）
    return cell;
}

#pragma mark - UICollectionView DelegateFlowLayout

- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath {
    // 两列布局：左右 16 间距，中间列间距 12
    CGFloat insetLR = 16.0;
    CGFloat spacing = 12.0;
    CGFloat contentW = collectionView.bounds.size.width - insetLR * 2;
    CGFloat itemW = floor((contentW - spacing) / 2.0);
    CGFloat itemH = itemW * 0.75 + 56; // KBSkinCardCell 内部高度估算
    return CGSizeMake(itemW, itemH);
}

- (UIEdgeInsets)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout insetForSectionAtIndex:(NSInteger)section {
    return UIEdgeInsetsMake(12, 16, 12, 16);
}

- (CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout minimumLineSpacingForSectionAtIndex:(NSInteger)section {
    return 12.0;
}

- (CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout minimumInteritemSpacingForSectionAtIndex:(NSInteger)section {
    return 12.0;
}

#pragma mark - UIScrollView Delegate（转发给分页容器）
- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
    !self.scrollCallback ?: self.scrollCallback(scrollView);
}

#pragma mark - JXPagingViewListViewDelegate
- (UIView *)listView { return self.view; }
- (UIScrollView *)listScrollView { return self.collectionView; }
- (void)listViewDidScrollCallback:(void (^)(UIScrollView *))callback { self.scrollCallback = callback; }
- (void)listWillAppear { NSLog(@"%@:%@", self.title, NSStringFromSelector(_cmd)); }
- (void)listDidAppear { NSLog(@"%@:%@", self.title, NSStringFromSelector(_cmd)); }
- (void)listWillDisappear { NSLog(@"%@:%@", self.title, NSStringFromSelector(_cmd)); }
- (void)listDidDisappear { NSLog(@"%@:%@", self.title, NSStringFromSelector(_cmd)); }

#pragma mark - Lazy
- (UICollectionView *)collectionView {
    if (!_collectionView) {
        UICollectionViewFlowLayout *layout = [UICollectionViewFlowLayout new];
        layout.scrollDirection = UICollectionViewScrollDirectionVertical;
        _collectionView = [[UICollectionView alloc] initWithFrame:CGRectZero collectionViewLayout:layout];
        _collectionView.backgroundColor = [UIColor clearColor];
        _collectionView.dataSource = self;
        _collectionView.delegate = self;
        // 注册皮肤卡片 cell
        [_collectionView registerClass:KBSkinCardCell.class forCellWithReuseIdentifier:@"KBSkinCardCell"]; // 复用标识
    }
    return _collectionView;
}

@end