//
//  JXHotRecommendView.m
//  AICity
//
//  热门推荐组件实现
//

#import "JXHotRecommendView.h"
#import <SDWebImage/SDWebImage.h>
#import <Masonry/Masonry.h>

static NSString * const kHotRecommendCellIdentifier = @"HotRecommendCell";
static const CGFloat kCellWidth = 120.0;
static const CGFloat kCellHeight = 180.0;

@interface JXHotRecommendCell : UICollectionViewCell
@property (nonatomic, strong) UIImageView *coverImageView;
@property (nonatomic, strong) UILabel *titleLabel;
@property (nonatomic, strong) UILabel *descLabel;
@end

@implementation JXHotRecommendCell

- (instancetype)initWithFrame:(CGRect)frame {
    self = [super initWithFrame:frame];
    if (self) {
        // 封面图
        self.coverImageView = [[UIImageView alloc] init];
        self.coverImageView.contentMode = UIViewContentModeScaleAspectFill;
        self.coverImageView.clipsToBounds = YES;
        self.coverImageView.layer.cornerRadius = 8;
        [self.contentView addSubview:self.coverImageView];
        
        // 标题
        self.titleLabel = [[UILabel alloc] init];
        self.titleLabel.font = [UIFont boldSystemFontOfSize:14];
        self.titleLabel.textColor = [UIColor blackColor];
        self.titleLabel.numberOfLines = 2;
        [self.contentView addSubview:self.titleLabel];
        
        // 描述（集数）
        self.descLabel = [[UILabel alloc] init];
        self.descLabel.font = [UIFont systemFontOfSize:12];
        self.descLabel.textColor = [UIColor grayColor];
        [self.contentView addSubview:self.descLabel];
        
        // Layout
        [self.coverImageView mas_makeConstraints:^(MASConstraintMaker *make) {
            make.top.left.right.equalTo(self.contentView);
            make.height.mas_equalTo(kCellHeight - 60);
        }];
        
        [self.titleLabel mas_makeConstraints:^(MASConstraintMaker *make) {
            make.top.equalTo(self.coverImageView.mas_bottom).offset(4);
            make.left.right.equalTo(self.contentView);
        }];
        
        [self.descLabel mas_makeConstraints:^(MASConstraintMaker *make) {
            make.top.equalTo(self.titleLabel.mas_bottom).offset(2);
            make.left.right.equalTo(self.contentView);
        }];
    }
    return self;
}

@end

#pragma mark - Hot Recommend View

@interface JXHotRecommendView () <UICollectionViewDelegate, UICollectionViewDataSource, UICollectionViewDelegateFlowLayout>

@property (nonatomic, strong) UILabel *titleLabel;
@property (nonatomic, strong) UICollectionView *collectionView;

@end

@implementation JXHotRecommendView

- (instancetype)initWithFrame:(CGRect)frame {
    self = [super initWithFrame:frame];
    if (self) {
        [self setupUI];
    }
    return self;
}

- (void)setupUI {
    self.backgroundColor = [UIColor whiteColor];
    
    // 标题
    self.titleLabel = [[UILabel alloc] init];
    self.titleLabel.text = @"热门推荐";
    self.titleLabel.font = [UIFont boldSystemFontOfSize:18];
    self.titleLabel.textColor = [UIColor blackColor];
    [self addSubview:self.titleLabel];
    
    // CollectionView Layout
    UICollectionViewFlowLayout *layout = [[UICollectionViewFlowLayout alloc] init];
    layout.scrollDirection = UICollectionViewScrollDirectionHorizontal;
    layout.minimumLineSpacing = 12;
    layout.minimumInteritemSpacing = 0;
    layout.sectionInset = UIEdgeInsetsMake(0, 16, 0, 16);
    
    // CollectionView
    self.collectionView = [[UICollectionView alloc] initWithFrame:CGRectZero collectionViewLayout:layout];
    self.collectionView.delegate = self;
    self.collectionView.dataSource = self;
    self.collectionView.backgroundColor = [UIColor whiteColor];
    self.collectionView.showsHorizontalScrollIndicator = NO;
    [self.collectionView registerClass:[JXHotRecommendCell class] forCellWithReuseIdentifier:kHotRecommendCellIdentifier];
    [self addSubview:self.collectionView];
    
    // Layout
    [self.titleLabel mas_makeConstraints:^(MASConstraintMaker *make) {
        make.top.equalTo(self).offset(12);
        make.left.equalTo(self).offset(16);
        make.right.equalTo(self).offset(-16);
        make.height.mas_equalTo(25);
    }];
    
    [self.collectionView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.top.equalTo(self.titleLabel.mas_bottom).offset(8);
        make.left.right.bottom.equalTo(self);
    }];
}

- (void)updateItems:(NSArray<JXBannerItem *> *)items {
    self.items = items;
    [self.collectionView reloadData];
}

#pragma mark - UICollectionViewDataSource

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

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
    JXHotRecommendCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:kHotRecommendCellIdentifier forIndexPath:indexPath];
    
    JXBannerItem *item = self.items[indexPath.item];
    
    // 优先使用竖向封面
    NSString *imageUrl = item.vCoverUrl ?: item.hCoverUrl;
    if (imageUrl) {
        [cell.coverImageView sd_setImageWithURL:[NSURL URLWithString:imageUrl]
                               placeholderImage:nil];
    }
    
    cell.titleLabel.text = item.name;
    cell.descLabel.text = item.describe;
    
    return cell;
}

#pragma mark - UICollectionViewDelegate

- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath {
    JXBannerItem *item = self.items[indexPath.item];
    if (self.onItemClick) {
        self.onItemClick(item);
    }
}

#pragma mark - UICollectionViewDelegateFlowLayout

- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath {
    return CGSizeMake(kCellWidth, kCellHeight);
}

@end