//
//  KBSkinDetailVC.m
//  keyBoard

#import "KBSkinDetailVC.h"
#import <Masonry/Masonry.h>
#import "UIColor+Extension.h"
#import "UICollectionViewLeftAlignedLayout.h"
#import "KBSkinDetailHeaderCell.h"
#import "KBSkinTagsContainerCell.h"
#import "KBSkinCardCell.h"
#import "KBSkinSectionTitleCell.h"
#import "KBSkinBottomActionView.h"

static NSString * const kHeaderCellId = @"kHeaderCellId";
static NSString * const kTagsContainerCellId = @"kTagsContainerCellId";
static NSString * const kSectionTitleCellId = @"kSectionTitleCellId";
static NSString * const kGridCellId = @"kGridCellId"; // 直接复用 KBSkinCardCell

typedef NS_ENUM(NSInteger, KBSkinDetailSection) {
    KBSkinDetailSectionHeader = 0,
    KBSkinDetailSectionTags,
    KBSkinDetailSectionTitle,
    KBSkinDetailSectionGrid,
    KBSkinDetailSectionCount
};

@interface KBSkinDetailVC () <UICollectionViewDataSource, UICollectionViewDelegateFlowLayout>
@property (nonatomic, strong) UICollectionView *collectionView; // 主列表
@property (nonatomic, strong) KBSkinBottomActionView *bottomBar; // 底部操作条
@property (nonatomic, copy) NSArray<NSString *> *tags;           // 标签数据
@property (nonatomic, copy) NSArray<NSDictionary *> *gridData;   // 底部网格数据
@end

@implementation KBSkinDetailVC

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

    // 简单数据（演示）
    self.tags = @[ @"Cute", @"Fresh", @"Cute", @"Fresh", @"Cute", @"Fresh" ];
    self.gridData = @[
        @{ @"title": @"Dopamine" }, @{ @"title": @"Dopamine" },
        @{ @"title": @"Dopamine" }, @{ @"title": @"Dopamine" },
        @{ @"title": @"Dopamine" }, @{ @"title": @"Dopamine" },
    ];

    // 1. 列表
    [self.view addSubview:self.collectionView];

    // 2. 底部操作条（左右 15，高 45，可点击）
    [self.view addSubview:self.bottomBar];
    [self.bottomBar mas_makeConstraints:^(MASConstraintMaker *make) {
        make.left.equalTo(self.view).offset(15);
        make.right.equalTo(self.view).offset(-15);
        make.height.mas_equalTo([KBSkinBottomActionView preferredHeight]);
        if (@available(iOS 11.0, *)) {
            make.bottom.equalTo(self.view.mas_safeAreaLayoutGuideBottom);
        } else {
            make.bottom.equalTo(self.view);
        }
    }];

    // 列表底部距离操作条顶部 10
    [self.collectionView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.left.right.equalTo(self.view);
        make.top.equalTo(self.view).offset(KB_NAV_TOTAL_HEIGHT);
        make.bottom.equalTo(self.bottomBar.mas_top).offset(-10);
    }];
}

#pragma mark - UICollectionView DataSource

- (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView {
    return KBSkinDetailSectionCount;
}

- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {
    switch (section) {
        case KBSkinDetailSectionHeader: return 1; // 顶部大卡片
        case KBSkinDetailSectionTags:   return 1; // 标签容器
        case KBSkinDetailSectionTitle:  return 1; // 标题
        case KBSkinDetailSectionGrid:   return self.gridData.count; // 2 列网格
    }
    return 0;
}

- (__kindof UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
    switch (indexPath.section) {
        case KBSkinDetailSectionHeader: {
            KBSkinDetailHeaderCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:kHeaderCellId forIndexPath:indexPath];
            [cell configWithTitle:@"Dopamine" right:@"Download: 1 Million"];
            return cell;
        }
        case KBSkinDetailSectionTags: {
            KBSkinTagsContainerCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:kTagsContainerCellId forIndexPath:indexPath];
            [cell configWithTags:self.tags];
            return cell;
        }
        case KBSkinDetailSectionTitle: {
            KBSkinSectionTitleCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:kSectionTitleCellId forIndexPath:indexPath];
            [cell config:@"Recommended Skin"];
            return cell;
        }
        case KBSkinDetailSectionGrid: {
            KBSkinCardCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:kGridCellId forIndexPath:indexPath];
            NSDictionary *d = self.gridData[indexPath.item];
            [cell configWithTitle:d[@"title"] imageURL:nil price:@"20"];
            return cell;
        }
    }
    return [UICollectionViewCell new];
}

#pragma mark - UICollectionView DelegateFlowLayout

- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath {
    CGFloat W = collectionView.bounds.size.width;
    CGFloat insetLR = 16.0;
    CGFloat contentW = W - insetLR * 2;
    switch (indexPath.section) {
        case KBSkinDetailSectionHeader: {
            // 高度 = 图片 0.58W + 文案与上下留白（≈56）
            CGFloat h = contentW * 0.58 + 56;
            return CGSizeMake(contentW, h);
        }
        case KBSkinDetailSectionTags: {
            CGFloat h = [KBSkinTagsContainerCell heightForTags:self.tags width:W];
            return CGSizeMake(contentW, h);
        }
        case KBSkinDetailSectionTitle: {
            return CGSizeMake(contentW, 44);
        }
        case KBSkinDetailSectionGrid: {
            // 2 列
            CGFloat spacing = 12.0;
            CGFloat itemW = floor((contentW - spacing) / 2.0);
//            CGFloat itemH = itemW * 0.75 + 56;
            return CGSizeMake(itemW, KBFit(197));
        }
    }
    return CGSizeZero;
}

- (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 {
    // 网格区需要这个间距，其它区也保持统一
    return 12.0;
}

#pragma mark - Lazy

- (UICollectionView *)collectionView {
    if (!_collectionView) {
        UICollectionViewFlowLayout *layout = [UICollectionViewFlowLayout new];
        layout.scrollDirection = UICollectionViewScrollDirectionVertical;
        _collectionView = [[UICollectionView alloc] initWithFrame:CGRectZero collectionViewLayout:layout];
        _collectionView.backgroundColor = [UIColor whiteColor];
        _collectionView.dataSource = self;
        _collectionView.delegate = self;

        // 注册 cell
        [_collectionView registerClass:KBSkinDetailHeaderCell.class forCellWithReuseIdentifier:kHeaderCellId];
        [_collectionView registerClass:KBSkinTagsContainerCell.class forCellWithReuseIdentifier:kTagsContainerCellId];
        [_collectionView registerClass:KBSkinSectionTitleCell.class forCellWithReuseIdentifier:kSectionTitleCellId];
        [_collectionView registerClass:KBSkinCardCell.class forCellWithReuseIdentifier:kGridCellId];
    }
    return _collectionView;
}

#pragma mark - Lazy (Bottom Bar)

- (KBSkinBottomActionView *)bottomBar {
    if (!_bottomBar) {
        _bottomBar = [[KBSkinBottomActionView alloc] init];
        // 中文注释：配置文案与图标，可根据业务传入金币图/价格
        [_bottomBar configWithTitle:@"Download" price:@"20" icon:nil];
        KBWeakSelf
        _bottomBar.tapHandler = ^{
            // 示例：点击下载/购买
//            [KBHUD showText:@"点击了下载"];
            // TODO: 在此处触发下载/购买逻辑
            [weakSelf handleDownloadAction];
        };
    }
    return _bottomBar;
}

#pragma mark - Actions
- (void)handleDownloadAction {
    // 预留：下载/购买动作
}

@end