//
//  KBSearchResultVC.m
//  keyBoard
//

#import "KBSearchResultVC.h"
#import "KBSearchBarView.h"
#import "KBSkinCardCell.h"

static NSString * const kResultCellId = @"KBSkinCardCell";

@interface KBSearchResultVC ()<UICollectionViewDataSource, UICollectionViewDelegateFlowLayout>

// 顶部自定义栏：返回按钮 + 搜索栏
@property (nonatomic, strong) UIView *topBar;
@property (nonatomic, strong) UIButton *backButton;
@property (nonatomic, strong) KBSearchBarView *searchBarView;

// 结果列表
@property (nonatomic, strong) UICollectionView *collectionView;
@property (nonatomic, strong) UICollectionViewFlowLayout *flowLayout;

// 数据源（示例数据，实际项目中由网络返回）
@property (nonatomic, strong) NSMutableArray<NSDictionary *> *resultItems; // @{title, price}

@end

@implementation KBSearchResultVC

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

    // 添加子视图
    [self.view addSubview:self.topBar];
    [self.topBar addSubview:self.backButton];
    [self.topBar addSubview:self.searchBarView];
    [self.view addSubview:self.collectionView];

    // Masonry 布局：顶部自定义栏（无导航栏）
    [self.topBar mas_makeConstraints:^(MASConstraintMaker *make) {
        make.top.equalTo(self.view.mas_top).offset(KB_STATUSBAR_HEIGHT + 8);
        make.left.right.equalTo(self.view);
        make.height.mas_equalTo(44);
    }];
    [self.backButton mas_makeConstraints:^(MASConstraintMaker *make) {
        make.left.equalTo(self.topBar).offset(12);
        make.centerY.equalTo(self.topBar);
        make.width.mas_equalTo(28);
        make.height.mas_equalTo(36);
    }];
    [self.searchBarView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.centerY.equalTo(self.backButton);
        make.left.equalTo(self.backButton.mas_right).offset(12);
        make.width.mas_equalTo(315);
        make.height.mas_equalTo(36);
        make.right.lessThanOrEqualTo(self.topBar).offset(-16);
    }];
    [self.collectionView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.top.equalTo(self.topBar.mas_bottom).offset(12);
        make.left.right.bottom.equalTo(self.view);
    }];

    // 默认关键字（如果有）
    if (self.defaultKeyword.length > 0) {
        [self.searchBarView updateKeyword:self.defaultKeyword];
        [self performSearch:self.defaultKeyword];
    } else {
        // 填充一些示例数据
        [self loadMockData];
    }
}

- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];
    // 隐藏系统导航栏
    [self.navigationController setNavigationBarHidden:YES animated:animated];
}

- (void)viewWillDisappear:(BOOL)animated {
    [super viewWillDisappear:animated];
    if (self.isMovingFromParentViewController || self.isBeingDismissed) {
        [self.navigationController setNavigationBarHidden:NO animated:animated];
    }
}

#pragma mark - Private

/// 执行搜索（示例：本地生成一些数据）
- (void)performSearch:(NSString *)keyword {
    // 这里可以发起网络请求；演示中生成 10 条假数据
    [self.resultItems removeAllObjects];
    for (int i = 0; i < 10; i++) {
        [self.resultItems addObject:@{ @"title": @"Dopamine", @"price": @"20" }];
    }
    [self.collectionView reloadData];
}

/// 示例数据
- (void)loadMockData {
    [self.resultItems removeAllObjects];
    for (int i = 0; i < 12; i++) {
        [self.resultItems addObject:@{ @"title": @"Dopamine", @"price": @"20" }];
    }
    [self.collectionView reloadData];
}

#pragma mark - UICollectionViewDataSource

- (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView {
    return 1;
}

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

- (__kindof UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
    KBSkinCardCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:kResultCellId forIndexPath:indexPath];
    NSDictionary *it = self.resultItems[indexPath.item];
    [cell configWithTitle:it[@"title"] imageURL:nil price:it[@"price"]];
    return cell;
}

#pragma mark - UICollectionViewDelegateFlowLayout

- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath {
    // 两列布局
    CGFloat width = collectionView.bounds.size.width;
    CGFloat inset = 16;   // 左右间距
    CGFloat spacing = 12; // 列间距
    CGFloat w = floor((width - inset * 2 - spacing) / 2.0);
    CGFloat h = w * 0.75 + 8 + 20 + 10 + 6 + 8; // 与 KBSkinCardCell 估算一致
    return CGSizeMake(w, h);
}

- (UIEdgeInsets)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout insetForSectionAtIndex:(NSInteger)section {
    return UIEdgeInsetsMake(8, 16, 20, 16);
}

- (CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout minimumInteritemSpacingForSectionAtIndex:(NSInteger)section {
    return 12;
}

- (CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout minimumLineSpacingForSectionAtIndex:(NSInteger)section {
    return 16;
}

#pragma mark - Lazy

- (KBSearchBarView *)searchBarView {
    if (!_searchBarView) {
        _searchBarView = [[KBSearchBarView alloc] init];
        _searchBarView.placeholder = @"Themes";
        KBWeakSelf
        _searchBarView.onSearch = ^(NSString * _Nonnull keyword) {
            [weakSelf performSearch:keyword];
        };
    }
    return _searchBarView;
}

- (UIView *)topBar {
    if (!_topBar) {
        _topBar = [[UIView alloc] init];
        _topBar.backgroundColor = [UIColor whiteColor];
    }
    return _topBar;
}

- (UIButton *)backButton {
    if (!_backButton) {
        _backButton = [UIButton buttonWithType:UIButtonTypeSystem];
        UIImage *img = nil;
        if (@available(iOS 13.0, *)) {
            img = [UIImage systemImageNamed:@"chevron.left"];
        }
        if (img) {
            [_backButton setImage:img forState:UIControlStateNormal];
        } else {
            [_backButton setTitle:@"<" forState:UIControlStateNormal];
            _backButton.titleLabel.font = [UIFont systemFontOfSize:22 weight:UIFontWeightSemibold];
        }
        [_backButton setTintColor:[UIColor blackColor]];
        [_backButton addTarget:self action:@selector(onTapBack) forControlEvents:UIControlEventTouchUpInside];
    }
    return _backButton;
}

- (void)onTapBack { [self.navigationController popViewControllerAnimated:YES]; }

- (UICollectionViewFlowLayout *)flowLayout {
    if (!_flowLayout) {
        _flowLayout = [[UICollectionViewFlowLayout alloc] init];
        _flowLayout.scrollDirection = UICollectionViewScrollDirectionVertical;
    }
    return _flowLayout;
}

- (UICollectionView *)collectionView {
    if (!_collectionView) {
        _collectionView = [[UICollectionView alloc] initWithFrame:CGRectZero collectionViewLayout:self.flowLayout];
        _collectionView.backgroundColor = [UIColor whiteColor];
        _collectionView.dataSource = self;
        _collectionView.delegate = self;
        // 注册结果卡片 cell
        [_collectionView registerClass:KBSkinCardCell.class forCellWithReuseIdentifier:kResultCellId];
    }
    return _collectionView;
}

- (NSMutableArray<NSDictionary *> *)resultItems {
    if (!_resultItems) {
        _resultItems = [NSMutableArray array];
    }
    return _resultItems;
}

@end