//
//  KBMyKeyBoardVC.m
//  keyBoard
//
//  Created by Mac on 2025/11/10.
//

#import "KBMyKeyBoardVC.h"
#import "BMLongPressDragCellCollectionView.h"
#import "UICollectionViewLeftAlignedLayout.h"
#import "KBMyKeyboardCell.h"
#import "KBAlert.h"
#import "KBMyVM.h"

/// 复用标识
static NSString * const kKBMyKeyboardCellId = @"kKBMyKeyboardCellId";

/// 截图页 - 自定义键盘管理
/// 要点：
/// 1）使用 BMLongPressDragCellCollectionView 支持长按拖拽排序；
/// 2）cell 宽度根据文案自适应；
/// 3）全部使用 Masonry 进行布局，并采用懒加载创建控件；
@interface KBMyKeyBoardVC () <BMLongPressDragCellCollectionViewDelegate, BMLongPressDragCellCollectionViewDataSource>

// UI
@property (nonatomic, strong) UIView *sheetView;              // 底部白色容器（圆角）
@property (nonatomic, strong) BMLongPressDragCellCollectionView *collectionView; // 可拖拽的列表
@property (nonatomic, strong) UIButton *saveButton;           // 保存按钮
@property (nonatomic, strong) UIImageView *bgImageView;       // 背景

// 数据源（必须是二维数组，库内部会在拖动时直接调整顺序）
@property (nonatomic, strong) NSMutableArray<NSMutableArray<NSDictionary *> *> *dataSourceArray; // {emoji,title}
@property (nonatomic, strong) KBMyVM *viewModel;         // 我的页面 VM

@end

@interface KBMyKeyBoardVC ()

@end

@implementation KBMyKeyBoardVC

- (void)viewDidLoad {
    [super viewDidLoad];
    self.viewModel = [[KBMyVM alloc] init];
    self.view.backgroundColor = [UIColor colorWithHex:0xF6F8F9];
    self.kb_navView.backgroundColor = [UIColor clearColor];
    self.kb_titleLabel.text = KBLocalized(@"My Keyboard");
    // 布局视图
    [self.view insertSubview:self.bgImageView belowSubview:self.kb_navView];
    [self.view addSubview:self.sheetView];
    [self.sheetView addSubview:self.collectionView];
    [self.view addSubview:self.saveButton];

    [self.bgImageView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.top.left.right.equalTo(self.view);
        make.height.mas_equalTo(323);
    }];
    [self.sheetView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.left.right.equalTo(self.view);
        make.top.equalTo(self.view).offset(KB_NAV_TOTAL_HEIGHT + 60);
        make.bottom.equalTo(self.view).offset(16);
    }];

    [self.collectionView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.left.right.top.equalTo(self.sheetView);
        make.bottom.equalTo(self.saveButton.mas_top).offset(-15);
    }];

    [self.saveButton mas_makeConstraints:^(MASConstraintMaker *make) {
        make.left.right.equalTo(self.view).insets(UIEdgeInsetsMake(0, 24, 0, 24));
        make.bottom.equalTo(self.view.mas_safeAreaLayoutGuideBottom).offset(-12);
        make.height.mas_equalTo(50);
    }];
    
    // 使用后端真实数据初始化列表
    [self kb_reloadUserCharacters];
}

- (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 - Data

- (void)kb_reloadUserCharacters {
    __weak typeof(self) weakSelf = self;
    [self.viewModel fetchCharacterListByUserWithCompletion:^(NSArray<KBCharacter *> * _Nonnull characterArray, NSError * _Nullable error) {
        // 请求失败或无数据时，不再使用本地测试数据，直接清空展示
        if (error || characterArray.count == 0) {
            weakSelf.dataSourceArray = [NSMutableArray array];
            [weakSelf.collectionView reloadData];
            return;
        }

        // 将 KBCharacter 模型转换为当前列表使用的 {emoji, title, id} 结构
        NSMutableArray<NSDictionary *> *section = [NSMutableArray arrayWithCapacity:characterArray.count];
        for (KBCharacter *c in characterArray) {
            NSString *emoji = c.emoji ?: @"";
            NSString *title = c.characterName ?: @"";
            NSString *identifier = c.ID ?: @"";
            NSString *characterId = c.characterId ?: @"";

            // 如果某条数据既没有 emoji 也没有标题，则忽略
            if (emoji.length == 0 && title.length == 0) {
                continue;
            }
            NSMutableDictionary *item = [NSMutableDictionary dictionary];
            item[@"emoji"] = emoji;
            item[@"title"] = title;
            item[@"characterId"] = characterId;

            if (identifier.length > 0) {
                // 用数字类型存储，便于直接作为 sort 数组上送
                NSInteger cid = identifier.integerValue;
                item[@"id"] = @(cid);
            }
            [section addObject:item];
        }

        weakSelf.dataSourceArray = [NSMutableArray array];
        if (section.count > 0) {
            [weakSelf.dataSourceArray addObject:section];
        }
        [weakSelf.collectionView reloadData];
    }];
}

#pragma mark - BMLongPressDragCellCollectionViewDataSource

- (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView { return self.dataSourceArray.count; }

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

- (__kindof UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
    KBMyKeyboardCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:kKBMyKeyboardCellId forIndexPath:indexPath];
    NSDictionary *d = self.dataSourceArray[indexPath.section][indexPath.item];
    [cell configEmoji:d[@"emoji"] title:d[@"title"]];
    __weak typeof(self) weakSelf = self;
    __weak typeof(collectionView) weakCV = collectionView;
    cell.onMinusTapped = ^(KBMyKeyboardCell * _Nonnull tappedCell) {
        __strong typeof(weakSelf) self = weakSelf;
        if (!self) { return; }
        NSIndexPath *tapIndexPath = [weakCV indexPathForCell:tappedCell];
        if (!tapIndexPath) { return; }

        // 取出将要删除的人设 id
        NSNumber *delId = nil; // 要删除的ID
        NSString *characterId = @""; // 通知其他页面要刷新的关联ID

        if (tapIndexPath.section < self.dataSourceArray.count) {
            NSArray *section = self.dataSourceArray[tapIndexPath.section];
            if (tapIndexPath.item < section.count) {
                NSDictionary *item = section[tapIndexPath.item];
                id cid = item[@"id"];
                characterId = item[@"characterId"];
                if ([cid isKindOfClass:[NSNumber class]]) {
                    delId = (NSNumber *)cid;
                } else if ([cid isKindOfClass:[NSString class]]) {
                    NSString *cidStr = (NSString *)cid;
                    if (cidStr.length > 0) {
                        delId = @([cidStr integerValue]);
                    }
                }
            }
        }

        [KBAlert confirmTitle:KBLocalized(@"Delete this tag?")
                      message:KBLocalized(@"This action cannot be undone")
                           ok:KBLocalized(@"Confirm")
                       cancel:KBLocalized(@"Cancel")
                      okColor:[UIColor redColor]
                  cancelColor:[UIColor blackColor]
                    completion:^(BOOL ok) {
            if (!ok) { return; }

            // 若无法获取 id，仅做本地删除以保持 UI 一致
            if (!delId) {
                if (tapIndexPath.section < self.dataSourceArray.count) {
                    NSMutableArray *section = self.dataSourceArray[tapIndexPath.section];
                    if (tapIndexPath.item < section.count) {
                        [section removeObjectAtIndex:tapIndexPath.item];
                        [self.collectionView performBatchUpdates:^{
                            [self.collectionView deleteItemsAtIndexPaths:@[tapIndexPath]];
                        } completion:nil];
                    }
                }
                return;
            }

            // 调用删除接口，成功后刷新界面
            __weak typeof(self) weakSelf2 = self;
            [self.viewModel deleteUserCharacterWithId:delId
                                           completion:^(BOOL success, NSError * _Nullable error) {
                __strong typeof(weakSelf2) strongSelf = weakSelf2;
                if (!strongSelf) { return; }

                if (!success) {
                    NSString *msg = error.localizedDescription ?: KBLocalized(@"Network error");
                    [KBHUD showInfo:msg];
                    return;
                }
                // 通知 App 内其他页面（如 HomeRankContentVC / HomeHotVC）该人设已被删除
                NSDictionary *info = @{@"characterId": characterId ?: @0};
                dispatch_async(dispatch_get_main_queue(), ^{
                    [[NSNotificationCenter defaultCenter] postNotificationName:KBUserCharacterDeletedNotification
                                                                        object:nil
                                                                      userInfo:info];
                });
                // 重新拉取用户人设列表，刷新 UI
                [strongSelf kb_reloadUserCharacters];
            }];
        }];
    };
    return cell;
}

// 拖拽库要求实现：返回当前“二维数组”数据源
- (NSArray<NSArray<id> *> *)dataSourceWithDragCellCollectionView:(__kindof BMLongPressDragCellCollectionView *)dragCellCollectionView {
    return self.dataSourceArray;
}

// 拖拽后回调：保存最新数据
- (void)dragCellCollectionView:(BMLongPressDragCellCollectionView *)dragCellCollectionView newDataArrayAfterMove:(nullable NSArray<NSArray<id> *> *)newDataArray {
    self.dataSourceArray = [newDataArray mutableCopy];
}

#pragma mark - BMLongPressDragCellCollectionViewDelegate (布局)

// 根据文案长度动态返回 item 尺寸
- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath {
    NSDictionary *d = self.dataSourceArray[indexPath.section][indexPath.item];
    return [KBMyKeyboardCell sizeForEmoji:d[@"emoji"] title:d[@"title"]];
}

- (UIEdgeInsets)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout insetForSectionAtIndex:(NSInteger)section {
    return UIEdgeInsetsMake(12, 12, 12, 12);
}

- (CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout minimumLineSpacingForSectionAtIndex:(NSInteger)section { return 10; }
- (CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout minimumInteritemSpacingForSectionAtIndex:(NSInteger)section { return 10; }

#pragma mark - Actions

- (void)onSave {
    // 点击底部保存按钮时，调用更新用户人设排序接口
    [self kb_updateUserCharacterSortWithShowHUD:YES];
}

/// 当前 dataSourceArray 转换为接口需要的 sort 数组（按展示顺序）
- (NSArray<NSNumber *> *)kb_currentSortArray {
    NSMutableArray<NSNumber *> *result = [NSMutableArray array];
    for (NSArray *section in self.dataSourceArray) {
        for (NSDictionary *item in section) {
            id cid = item[@"id"];
            if ([cid isKindOfClass:[NSNumber class]]) {
                [result addObject:cid];
            } else if ([cid isKindOfClass:[NSString class]]) {
                NSString *cidStr = (NSString *)cid;
                if (cidStr.length > 0) {
                    NSInteger value = cidStr.integerValue;
                    [result addObject:@(value)];
                }
            }
        }
    }
    return result;
}

/// 调用 VM，向后端同步用户人设排序
- (void)kb_updateUserCharacterSortWithShowHUD:(BOOL)showHUD {
    NSArray<NSNumber *> *sortArray = [self kb_currentSortArray];
    if (showHUD) {
        [KBHUD show];
    }

    __weak typeof(self) weakSelf = self;
    [self.viewModel updateUserCharacterSortWithSortArray:sortArray
                                              completion:^(BOOL success, NSError * _Nullable error) {
        __strong typeof(weakSelf) self = weakSelf;
        if (!self) { return; }

        if (showHUD) {
            [KBHUD dismiss];
        }

        if (!success && error) {
            NSString *msg = error.localizedDescription ?: KBLocalized(@"Network error");
            [KBHUD showInfo:msg];
            return;
        }

        if (showHUD) {
            [KBHUD showSuccess:KBLocalized(@"Saved")];
        }
    }];
}

#pragma mark - Lazy UI

//- (UILabel *)titleLabel {
//    if (!_titleLabel) {
//        _titleLabel = [UILabel new];
//        _titleLabel.text = @"My Keyboard"; // 顶部标题
//        _titleLabel.font = [UIFont systemFontOfSize:18 weight:UIFontWeightSemibold];
//        _titleLabel.textColor = [UIColor colorWithHex:0x1B1F1A];
//    }
//    return _titleLabel;
//}

- (UIView *)sheetView {
    if (!_sheetView) {
        _sheetView = [UIView new];
        _sheetView.backgroundColor = [UIColor whiteColor];
        _sheetView.layer.cornerRadius = 32.0;
        _sheetView.layer.masksToBounds = YES;
    }
    return _sheetView;
}

- (BMLongPressDragCellCollectionView *)collectionView {
    if (!_collectionView) {
        UICollectionViewLeftAlignedLayout *layout = [UICollectionViewLeftAlignedLayout new];
        layout.scrollDirection = UICollectionViewScrollDirectionVertical;
//        layout.sectionInset = UIEdgeInsetsMake(16, 16, 16, 16);
        _collectionView = [[BMLongPressDragCellCollectionView alloc] initWithFrame:CGRectZero collectionViewLayout:layout];
        _collectionView.backgroundColor = [UIColor clearColor];
        _collectionView.delegate = self;   // 注意：代理为 BMLongPressDragCellCollectionViewDelegate
        _collectionView.dataSource = self; // 注意：数据源为 BMLongPressDragCellCollectionViewDataSource
        _collectionView.alwaysBounceVertical = YES;
        _collectionView.showsVerticalScrollIndicator = NO;
        [_collectionView registerClass:KBMyKeyboardCell.class forCellWithReuseIdentifier:kKBMyKeyboardCellId];
    }
    return _collectionView;
}

- (UIButton *)saveButton {
    if (!_saveButton) {
        _saveButton = [UIButton buttonWithType:UIButtonTypeSystem];
        [_saveButton setTitle:KBLocalized(@"Save") forState:UIControlStateNormal];
        _saveButton.titleLabel.font = [KBFont medium:16];
        [_saveButton setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
        _saveButton.backgroundColor = [UIColor colorWithHex:KBColorValue];
        _saveButton.layer.cornerRadius = 25;
        _saveButton.layer.masksToBounds = YES;
        [_saveButton addTarget:self action:@selector(onSave) forControlEvents:UIControlEventTouchUpInside];
    }
    return _saveButton;
}

- (UIImageView *)bgImageView{
    if (!_bgImageView) {
        _bgImageView = [[UIImageView alloc] init];
        _bgImageView.image = [UIImage imageNamed:@"my_keyboard_bg"];
    }
    return _bgImageView;
}

@end