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

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

@interface KBShopItemVC ()<UICollectionViewDataSource, UICollectionViewDelegateFlowLayout>
@property (nonatomic, copy) void(^scrollCallback)(UIScrollView *scrollView);
@property (nonatomic, strong) KBShopVM *internalViewModel;
@property (nonatomic, assign, getter=isLoading) BOOL loading;
@end

@implementation KBShopItemVC

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

    // 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
    }];

    KBWeakSelf
    if (self.isNeedHeader) {
        self.collectionView.mj_header = [MJRefreshNormalHeader headerWithRefreshingBlock:^{
            [weakSelf fetchThemes];
        }];
    }
    if (self.isNeedFooter) {
        self.collectionView.mj_footer = [MJRefreshAutoNormalFooter footerWithRefreshingBlock:^{
            [weakSelf fetchThemes];
        }];
    }

    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.isLoading) {
        return;
    }
    if (!self.style.styleId.length) {
        return;
    }
    [self beginRefreshImmediately];
}

- (void)beginRefreshImmediately {
    if (self.isNeedHeader && !self.collectionView.mj_header.isRefreshing) {
        [self.collectionView.mj_header beginRefreshing];
    }
    [self fetchThemes];
}

- (void)fetchThemes {
    if (self.isLoading) {
        return;
    }
    NSString *styleId = self.style.styleId;
    if (!styleId.length) {
        return;
    }
    self.loading = YES;
    KBShopVM *vm = self.shopViewModel;
    if (!vm) {
        if (!self.internalViewModel) {
            self.internalViewModel = [[KBShopVM alloc] init];
        }
        vm = self.internalViewModel;
    }
    KBWeakSelf
    [vm fetchThemesForStyleId:styleId completion:^(NSArray<KBShopThemeModel *> * _Nullable themes, NSError * _Nullable error) {
        dispatch_async(dispatch_get_main_queue(), ^{
            weakSelf.loading = NO;
            weakSelf.isHeaderRefreshed = YES;
            if (error) {
                NSString *msg = error.localizedDescription ?: KBLocalized(@"Network error");
                [KBHUD showInfo:msg];
            } else {
                weakSelf.dataSource = themes.count ? themes.mutableCopy : [NSMutableArray array];
                [weakSelf.collectionView reloadData];
            }
            if ([weakSelf.collectionView.mj_header isRefreshing]) {
                [weakSelf.collectionView.mj_header endRefreshing];
            }
            if ([weakSelf.collectionView.mj_footer isRefreshing]) {
                [weakSelf.collectionView.mj_footer endRefreshing];
            }
        });
    }];
}

#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];
    KBShopThemeModel *theme = (indexPath.item < self.dataSource.count) ? self.dataSource[indexPath.item] : nil;
    NSString *title = theme.themeName.length ? theme.themeName : KBLocalized(@"Themes");
    NSString *price = [self kb_priceStringForTheme:theme];
    [cell configWithTitle:title imageURL:nil price:price];
    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, KBFit(197));
}

- (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;
}

- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath{
    [self kb_handleShopTapAtIndexPath:indexPath];
}

- (NSString *)kb_priceStringForTheme:(KBShopThemeModel *)theme {
    if (!theme) {
        return @"";
    }
    if (theme.themePrice <= 0.0f) {
        return KBLocalized(@"Free");
    }
    static NSNumberFormatter *formatter;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        formatter = [[NSNumberFormatter alloc] init];
        formatter.minimumFractionDigits = 0;
        formatter.maximumFractionDigits = 2;
        formatter.minimumIntegerDigits = 1;
    });
    NSString *priceString = [formatter stringFromNumber:@(theme.themePrice)];
    return priceString ?: [NSString stringWithFormat:@"%.2f", theme.themePrice];
}

- (void)kb_handleShopTapAtIndexPath:(NSIndexPath *)indexPath {
    KBShopThemeModel *theme = (indexPath.item < self.dataSource.count) ? self.dataSource[indexPath.item] : nil;
    NSString *title = theme.themeName.length ? theme.themeName : KBLocalized(@"专属皮肤002");
    // 将需求固定到 002.zip，本地写死皮肤 id，便于键盘扩展识别并解压。
    static NSString * const kKBBundleSkinId002 = @"bundle_skin_fense";
    [KBSkinInstallBridge publishBundleSkinRequestWithId:kKBBundleSkinId002
                                                  name:title ?: kKBBundleSkinId002
                                               zipName:@"fense.zip"
                                        iconShortNames:nil];
    [KBHUD showInfo:KBLocalized(@"已通知键盘解压，切换到自定义键盘即可生效")];
}

- (void)setStyle:(KBShopStyleModel *)style {
    _style = style;
    if (self.isViewLoaded && !self.isHeaderRefreshed) {
        [self beginFirstRefresh];
    }
}

#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