//
//  MySkinVC.m
//  keyBoard
//

#import "MySkinVC.h"
#import "KBSkinDetailVC.h"
#import <Masonry/Masonry.h>
#import "UIColor+Extension.h"
#import <MJRefresh/MJRefresh.h>
#import "UIScrollView+KBEmptyView.h" // 统一空态封装（LYEmptyView）

#import "MySkinCell.h"
#import "KBMyVM.h"
#import "KBMyTheme.h"
#import "KBHUD.h"

static NSString * const kMySkinCellId = @"kMySkinCellId";

@interface MySkinVC () <UICollectionViewDataSource, UICollectionViewDelegate>
@property (nonatomic, strong) UICollectionView *collectionView; // 列表
@property (nonatomic, strong) UIView *bottomView;                // 底部操作条
@property (nonatomic, strong) UILabel *selectedLabel;            // 已选择数量
@property (nonatomic, strong) UIButton *deleteButton;            // 删除

@property (nonatomic, strong) NSMutableArray<KBMyTheme *> *data; // 已购主题
@property (nonatomic, strong) KBMyVM *viewModel;
@property (nonatomic, assign, getter=isEditingMode) BOOL editingMode;  // 是否编辑态
@end

@implementation MySkinVC

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

//    self.title = @"My Skin"; // 标题
    self.kb_titleLabel.text = KBLocalized(@"My skin");
    // 右上角 Editor/Cancel 使用 BaseViewController 自定义导航栏的 kb_rightButton
    self.kb_rightButton.hidden = NO;
    [self.kb_rightButton setTitle:KBLocalized(@"Editor") forState:UIControlStateNormal];
    [self.kb_rightButton removeTarget:nil action:NULL forControlEvents:UIControlEventAllEvents];
    [self.kb_rightButton addTarget:self action:@selector(onToggleEdit) forControlEvents:UIControlEventTouchUpInside];

    // 数据源初始化为空（演示空态 + 下拉刷新）
    self.data = [NSMutableArray array];

    // 视图
    [self.view addSubview:self.collectionView];
    [self.view addSubview:self.bottomView];

    [self.collectionView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.top.equalTo(self.view).offset(KB_NAV_TOTAL_HEIGHT);
        make.left.right.equalTo(self.view);
        make.bottom.equalTo(self.bottomView.mas_top);
    }];

    [self.bottomView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.left.right.equalTo(self.view);
        make.bottom.equalTo(self.view.mas_bottom);
        // 初始未编辑状态：高度为 0，不占据空间
        make.height.mas_equalTo(0);
    }];

    // 空态视图（LYEmptyView）统一样式 + 重试按钮
    KBWeakSelf
    [self.collectionView kb_makeDefaultEmptyViewWithImage:nil
                                                    title:KBLocalized(@"No data")
                                                   detail:KBLocalized(@"Pull down to refresh")
                                              buttonTitle:KBLocalized(@"")
                                               tapHandler:nil
                                            buttonHandler:^{ [weakSelf.collectionView.mj_header beginRefreshing]; }];
    [self.collectionView kb_setLYAutoShowEnabled:NO]; // 采用手动控制显隐

    // 立即按当前数据源状态显示一次空态（首屏就应展示空视图）
    [self.collectionView kb_endLoadingForEmpty];

    // 下拉刷新（演示网络加载 + 空态切换）
    self.collectionView.mj_header = [MJRefreshNormalHeader headerWithRefreshingTarget:self refreshingAction:@selector(fetchPurchasedThemes)];

    // 首次进入自动刷新
    [self.collectionView.mj_header beginRefreshing];

    // 初始：非编辑态，隐藏底部
    self.bottomView.hidden = YES;
}

- (void)fetchPurchasedThemes {
    KBWeakSelf
    [self.viewModel fetchPurchasedThemesWithCompletion:^(NSArray<KBMyTheme *> * _Nullable themes, NSError * _Nullable error) {
        dispatch_async(dispatch_get_main_queue(), ^{
            if ([weakSelf.collectionView.mj_header isRefreshing]) {
                [weakSelf.collectionView.mj_header endRefreshing];
            }
            if (error) {
                [weakSelf.collectionView kb_endLoadingForEmpty];
                return;
            }
            [weakSelf.data removeAllObjects];
            if (themes.count > 0) {
                [weakSelf.data addObjectsFromArray:themes];
            }
            [weakSelf.collectionView reloadData];
            [weakSelf.collectionView kb_endLoadingForEmpty];
        });
    }];
}

#pragma mark - Actions

- (void)onToggleEdit {
    self.editingMode = !self.editingMode;

    // 更新顶部按钮
    [self.kb_rightButton setTitle:(self.isEditingMode ? KBLocalized(@"Cancel") : KBLocalized(@"Editor"))
                         forState:UIControlStateNormal];

    // 根据编辑态更新底部栏高度，并保持列表底部始终贴着 bottomView 顶部
    CGFloat targetHeight = self.isEditingMode ? (KB_SAFE_BOTTOM + 44.0) : 0.0;
    // 展开前先确保可见，动画结束后再根据状态隐藏
    self.bottomView.hidden = NO;
    [self.bottomView mas_updateConstraints:^(MASConstraintMaker *make) {
        make.height.mas_equalTo(targetHeight);
    }];
    [UIView animateWithDuration:0.25 animations:^{
        [self.view layoutIfNeeded];
    } completion:^(BOOL finished) {
        self.bottomView.hidden = !self.isEditingMode;
    }];

    // 列表进入/退出多选
    self.collectionView.allowsMultipleSelection = self.isEditingMode;
    // 直接刷新可见 cell，确保切换后立刻出现/隐藏 markView
    for (UICollectionViewCell *c in self.collectionView.visibleCells) {
        if (![c isKindOfClass:MySkinCell.class]) continue;
        MySkinCell *cell = (MySkinCell *)c;
        cell.editing = self.isEditingMode;
        NSIndexPath *ip = [self.collectionView indexPathForCell:cell];
        BOOL selected = [[self.collectionView indexPathsForSelectedItems] containsObject:ip];
        [cell updateSelected:selected];
    }
    // 再做一次 reload 保守刷新（防止 offscreen cell）
    [self.collectionView reloadData];

    // 清空选择并刷新底部文案
    for (NSIndexPath *ip in [self.collectionView indexPathsForSelectedItems]) {
        [self.collectionView deselectItemAtIndexPath:ip animated:NO];
    }
    [self updateBottomUI];
}

- (void)onDelete {
    // 根据选中项删除
    NSArray<NSIndexPath *> *selectedIndexPaths = [[self.collectionView indexPathsForSelectedItems] sortedArrayUsingSelector:@selector(compare:)];
    if (selectedIndexPaths.count == 0) return;

    NSMutableArray<NSNumber *> *themeIds = [NSMutableArray arrayWithCapacity:selectedIndexPaths.count];
    for (NSIndexPath *ip in selectedIndexPaths) {
        if (ip.item >= self.data.count) { continue; }
        KBMyTheme *theme = self.data[ip.item];
        id themeIdValue = theme.themeId;
        NSNumber *numberId = nil;
        if ([themeIdValue isKindOfClass:[NSNumber class]]) {
            numberId = (NSNumber *)themeIdValue;
        } else if ([themeIdValue isKindOfClass:[NSString class]]) {
            NSString *idString = (NSString *)themeIdValue;
            if (idString.length > 0) {
                static NSCharacterSet *nonDigitSet;
                static dispatch_once_t onceToken;
                dispatch_once(&onceToken, ^{
                    nonDigitSet = [[NSCharacterSet decimalDigitCharacterSet] invertedSet];
                });
                if ([idString rangeOfCharacterFromSet:nonDigitSet].location == NSNotFound) {
                    numberId = @([idString longLongValue]);
                }
            }
        }
        if (numberId) {
            [themeIds addObject:numberId];
        }
    }

    if (themeIds.count == 0) {
        [KBHUD showInfo:KBLocalized(@"Invalid parameter")];
        return;
    }

    [KBHUD show];
    KBWeakSelf
    [self.viewModel deletePurchasedThemesWithThemeIds:themeIds
                                           completion:^(BOOL success, NSError * _Nullable error) {
        dispatch_async(dispatch_get_main_queue(), ^{
            [KBHUD dismiss];
            if (!success) {
                NSString *msg = error.localizedDescription ?: KBLocalized(@"Network error");
                [KBHUD showInfo:msg];
                return;
            }
            // 批量更新，先改数据，再删 UI
            [weakSelf.collectionView performBatchUpdates:^{
                NSMutableIndexSet *set = [NSMutableIndexSet indexSet];
                for (NSIndexPath *ip in selectedIndexPaths) {
                    if (ip.item < weakSelf.data.count) {
                        [set addIndex:ip.item];
                    }
                }
                [weakSelf.data removeObjectsAtIndexes:set];
                [weakSelf.collectionView deleteItemsAtIndexPaths:selectedIndexPaths];
            } completion:^(BOOL finished) {
                [weakSelf updateBottomUI];
                // 根据当前数据源显隐空视图（删除到 0 条时应显示空态）
                [weakSelf.collectionView kb_endLoadingForEmpty];
            }];
        });
    }];
}

- (void)updateBottomUI {
    NSInteger count = self.collectionView.indexPathsForSelectedItems.count;
    NSString *format = KBLocalized(@"my_skin_selected_count");
    self.selectedLabel.text = [NSString stringWithFormat:format, (long)count];

    BOOL enable = count > 0;
    self.deleteButton.enabled = enable;
    if (enable) {
        self.deleteButton.backgroundColor = [UIColor colorWithHex:KBColorValue];
        [self.deleteButton setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
        self.deleteButton.layer.borderColor = [UIColor colorWithHex:KBColorValue].CGColor;
    } else {
        self.deleteButton.backgroundColor = [UIColor colorWithHex:0xF2F2F2];
        [self.deleteButton setTitleColor:[UIColor colorWithHex:0xC8C8C8] forState:UIControlStateNormal];
        self.deleteButton.layer.borderColor = [UIColor colorWithHex:0xE6E6E6].CGColor;
    }
}

#pragma mark - UICollectionView

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

- (__kindof UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
    MySkinCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:kMySkinCellId forIndexPath:indexPath];
    KBMyTheme *theme = self.data[indexPath.item];
    [cell configWithTitle:theme.themeName image:nil];
    cell.editing = self.isEditingMode; // 控制是否显示选择圆点
    // 同步选中状态（复用时）
    BOOL selected = [[collectionView indexPathsForSelectedItems] containsObject:indexPath];
    [cell updateSelected:selected];
    return cell;
}

- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath {
    if (!self.isEditingMode) {
        // 非编辑态：可在此进入详情，当前示例不处理
        KBMyTheme *theme = self.data[indexPath.item];
        [collectionView deselectItemAtIndexPath:indexPath animated:YES];
        KBSkinDetailVC *vc = [[KBSkinDetailVC alloc] init];
        vc.themeId = theme.themeId;
        [self.navigationController pushViewController:vc animated:true];
        return;
    }
    MySkinCell *cell = (MySkinCell *)[collectionView cellForItemAtIndexPath:indexPath];
    [cell updateSelected:YES];
    [self updateBottomUI];
}

- (void)collectionView:(UICollectionView *)collectionView didDeselectItemAtIndexPath:(NSIndexPath *)indexPath {
    if (!self.isEditingMode) return;
    MySkinCell *cell = (MySkinCell *)[collectionView cellForItemAtIndexPath:indexPath];
    [cell updateSelected:NO];
    [self updateBottomUI];
}

- (void)collectionView:(UICollectionView *)collectionView willDisplayCell:(UICollectionViewCell *)cell forItemAtIndexPath:(NSIndexPath *)indexPath {
    if (![cell isKindOfClass:MySkinCell.class]) return;
    MySkinCell *c = (MySkinCell *)cell;
    c.editing = self.isEditingMode; // 保证滚动出现的新 cell 同步编辑态
    BOOL selected = [[collectionView indexPathsForSelectedItems] containsObject:indexPath];
    [c updateSelected:selected];
}

#pragma mark - Lazy

- (UICollectionView *)collectionView {
    if (!_collectionView) {
        UICollectionViewFlowLayout *layout = [UICollectionViewFlowLayout new];
        CGFloat inset = 16;
        CGFloat spacing = 12;
        CGFloat W = UIScreen.mainScreen.bounds.size.width;
        CGFloat itemW = floor((W - inset * 2 - spacing) / 2.0);
        CGFloat itemH = KBFit(168); // 接近截图比例
        layout.itemSize = CGSizeMake(itemW, itemH);
        layout.minimumInteritemSpacing = spacing;
        layout.minimumLineSpacing = spacing;
        layout.sectionInset = UIEdgeInsetsMake(12, inset, 12, inset);

        _collectionView = [[UICollectionView alloc] initWithFrame:CGRectZero collectionViewLayout:layout];
        _collectionView.backgroundColor = [UIColor whiteColor];
        _collectionView.dataSource = self;
        _collectionView.delegate = self;
        _collectionView.allowsMultipleSelection = NO; // 初始
        [_collectionView registerClass:MySkinCell.class forCellWithReuseIdentifier:kMySkinCellId];
    }
    return _collectionView;
}

- (UIView *)bottomView {
    if (!_bottomView) {
        _bottomView = [UIView new];
        _bottomView.backgroundColor = [UIColor whiteColor];
        _bottomView.layer.shadowColor = [UIColor colorWithWhite:0 alpha:0.06].CGColor;
        _bottomView.layer.shadowOpacity = 1;
        _bottomView.layer.shadowOffset = CGSizeMake(0, -2);

        [_bottomView addSubview:self.selectedLabel];
        [_bottomView addSubview:self.deleteButton];

        [self.selectedLabel mas_makeConstraints:^(MASConstraintMaker *make) {
            make.left.equalTo(_bottomView).offset(16);
            // 固定在安全区内的 64 高度中居中（顶部向下 32）
            make.centerY.equalTo(_bottomView.mas_top).offset(32);
        }];
        [self.deleteButton mas_makeConstraints:^(MASConstraintMaker *make) {
            make.right.equalTo(_bottomView).offset(-16);
            make.centerY.equalTo(_bottomView.mas_top).offset(32);
            make.width.mas_equalTo(92);
            make.height.mas_equalTo(36);
        }];
    }
    return _bottomView;
}

- (UILabel *)selectedLabel {
    if (!_selectedLabel) {
        _selectedLabel = [UILabel new];
        _selectedLabel.textColor = [UIColor colorWithHex:KBBlackValue];
        _selectedLabel.font = [KBFont medium:13];
//        _selectedLabel.text = @"Selected: 0 Skins";
    }
    return _selectedLabel;
}

- (UIButton *)deleteButton {
    if (!_deleteButton) {
        _deleteButton = [UIButton buttonWithType:UIButtonTypeSystem];
        [_deleteButton setTitle:KBLocalized(@"Delete") forState:UIControlStateNormal];
        _deleteButton.titleLabel.font = [KBFont medium:13];
        _deleteButton.layer.cornerRadius = 18;
        _deleteButton.layer.borderWidth = 1;
        _deleteButton.clipsToBounds = YES;
        [_deleteButton addTarget:self action:@selector(onDelete) forControlEvents:UIControlEventTouchUpInside];
        // 初始禁用态样式
        _deleteButton.enabled = NO;
        _deleteButton.backgroundColor = [UIColor colorWithHex:0xF2F2F2];
        [_deleteButton setTitleColor:[UIColor colorWithHex:0xC8C8C8] forState:UIControlStateNormal];
        _deleteButton.layer.borderColor = [UIColor colorWithHex:0xE6E6E6].CGColor;
    }
    return _deleteButton;
}

- (KBMyVM *)viewModel {
    if (!_viewModel) {
        _viewModel = [[KBMyVM alloc] init];
    }
    return _viewModel;
}

@end