//
//  NewHomeViewController.m
//  AICity
//
//  新版首页控制器实现
//

#import "NewHomeViewController.h"
#import "JXBannerView.h"
#import "JXHotRecommendView.h"
#import "JXAPIService.h"
#import "JXShortDramaViewController.h"
#import "SearchCommonBarView.h"
#import "SearchResultViewController.h"
#import <Masonry/Masonry.h>
#import <MJRefresh/MJRefresh.h>
#import <SDWebImage/SDWebImage.h>

static NSString * const kHomeGridCellIdentifier = @"HomeGridCell";

typedef NS_ENUM(NSInteger, HomeSectionType) {
    HomeSectionTypeBanner = 0,      // Banner 轮播
    HomeSectionTypeHotRecommend,    // 热门推荐
    HomeSectionTypeTodayRecommend   // 今日推荐（3列网格）
};

#pragma mark - Grid Cell

@interface HomeGridCell : UICollectionViewCell
@property (nonatomic, strong) UIImageView *coverImageView;
@property (nonatomic, strong) UILabel *titleLabel;
@end

@implementation HomeGridCell

- (instancetype)initWithFrame:(CGRect)frame {
    self = [super initWithFrame:frame];
    if (self) {
        self.coverImageView = [[UIImageView alloc] init];
        self.coverImageView.contentMode = UIViewContentModeScaleAspectFill;
        self.coverImageView.clipsToBounds = YES;
        self.coverImageView.layer.cornerRadius = 8;
        [self.contentView addSubview:self.coverImageView];
        
        self.titleLabel = [[UILabel alloc] init];
        self.titleLabel.font = [UIFont systemFontOfSize:12];
        self.titleLabel.textColor = [UIColor blackColor];
        self.titleLabel.numberOfLines = 2;
        [self.contentView addSubview:self.titleLabel];
        
        [self.coverImageView mas_makeConstraints:^(MASConstraintMaker *make) {
            make.top.left.right.equalTo(self.contentView);
            make.height.equalTo(self.coverImageView.mas_width).multipliedBy(1.5);
        }];
        
        [self.titleLabel mas_makeConstraints:^(MASConstraintMaker *make) {
            make.top.equalTo(self.coverImageView.mas_bottom).offset(4);
            make.left.right.equalTo(self.contentView);
        }];
    }
    return self;
}

@end

#pragma mark - New Home ViewController

@interface NewHomeViewController () <UICollectionViewDelegate, UICollectionViewDataSource, UICollectionViewDelegateFlowLayout>

@property (nonatomic, strong) SearchCommonBarView *searchBar;
@property (nonatomic, strong) UICollectionView *collectionView;

// Data
@property (nonatomic, strong) JXHomeHeaderData *headerData;
@property (nonatomic, strong) NSMutableArray *todayRecommendList;
@property (nonatomic, assign) NSInteger currentPage;

// Views
@property (nonatomic, strong) JXBannerView *bannerView;
@property (nonatomic, strong) JXHotRecommendView *hotRecommendView;

@end

@implementation NewHomeViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    self.view.backgroundColor = [UIColor whiteColor];
    self.todayRecommendList = [NSMutableArray array];
    self.currentPage = 1;
    
    [self setupUI];
    [self loadHomeData];
}

- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];
    [self.navigationController setNavigationBarHidden:YES animated:animated];
    
    // 启动 Banner 自动滚动
    if (self.bannerView) {
        [self.bannerView startAutoScroll];
    }
}

- (void)viewWillDisappear:(BOOL)animated {
    [super viewWillDisappear:animated];
    
    // 停止 Banner 自动滚动
    if (self.bannerView) {
        [self.bannerView stopAutoScroll];
    }
}

- (void)setupUI {
    // 搜索栏
    self.searchBar = [[SearchCommonBarView alloc] init];
    __weak typeof(self) weakSelf = self;
    self.searchBar.searchAction = ^(NSString * _Nonnull text) {
        [weakSelf performSearchWithKeyword:text];
    };
    [self.view addSubview:self.searchBar];
    
    // CollectionView
    UICollectionViewFlowLayout *layout = [[UICollectionViewFlowLayout alloc] init];
    layout.minimumLineSpacing = 12;
    layout.minimumInteritemSpacing = 8;
    layout.sectionInset = UIEdgeInsetsMake(12, 12, 12, 12);
    
    self.collectionView = [[UICollectionView alloc] initWithFrame:CGRectZero collectionViewLayout:layout];
    self.collectionView.delegate = self;
    self.collectionView.dataSource = self;
    self.collectionView.backgroundColor = [UIColor whiteColor];
    self.collectionView.alwaysBounceVertical = YES;
    [self.collectionView registerClass:[HomeGridCell class] forCellWithReuseIdentifier:kHomeGridCellIdentifier];
    [self.collectionView registerClass:[UICollectionViewCell class] forCellWithReuseIdentifier:@"CustomCell"];
    [self.view addSubview:self.collectionView];
    
    // 初始化数据模型
    if (!self.headerData) {
        self.headerData = [[JXHomeHeaderData alloc] init];
        self.headerData.banners = @[];
        self.headerData.hotMovies = @[];
        self.headerData.hotDramas = @[];
        NSLog(@"[NewHomeViewController] Initialized empty headerData");
    }
    
    // Layout
    [self.searchBar mas_makeConstraints:^(MASConstraintMaker *make) {
        make.top.equalTo(self.view.mas_safeAreaLayoutGuideTop);
        make.left.right.equalTo(self.view);
        make.height.mas_equalTo(44);
    }];
    
    [self.collectionView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.top.equalTo(self.searchBar.mas_bottom);
        make.left.right.bottom.equalTo(self.view);
    }];
    
    // 下拉刷新
    self.collectionView.mj_header = [MJRefreshNormalHeader headerWithRefreshingBlock:^{
        [weakSelf refreshData];
    }];
    
    // 上拉加载
    self.collectionView.mj_footer = [MJRefreshAutoNormalFooter footerWithRefreshingBlock:^{
        [weakSelf loadMoreData];
    }];
}

#pragma mark - Data Loading

- (void)loadHomeData {
    // 加载首页头部数据
    NSLog(@"[NewHomeViewController] Starting to load home data");
    
    // 设置加载超时保护（15秒）
    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(15 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
        if (!self.headerData || self.headerData.banners.count == 0) {
            NSLog(@"[NewHomeViewController] Home data loading timeout, using empty data");
            [self showErrorRecoveryUI:@"首页数据加载超时，显示空内容"];
        }
    });
    
    [[JXAPIService sharedService] getHomeHeaderDataWithSuccess:^(JXHomeHeaderData *headerData) {
        self.headerData = headerData;
        NSLog(@"[NewHomeViewController] Header data loaded: banners=%lu, hotMovies=%lu, hotDramas=%lu",
              (unsigned long)headerData.banners.count,
              (unsigned long)headerData.hotMovies.count,
              (unsigned long)headerData.hotDramas.count);
        
        [self.collectionView reloadData];
    } failure:^(NSError *error) {
        NSLog(@"[NewHomeViewController] Failed to load header data: %@", error);
        [self handleLoadingError:error section:@"首页头部数据"];
    }];
    
    // 加载今日推荐
    [self loadTodayRecommend];
}

- (void)loadTodayRecommend {
    NSLog(@"[NewHomeViewController] Starting to load today recommend, page=%ld", (long)self.currentPage);
    
    // 设置加载超时保护（10秒）
    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(10 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
        if (self.todayRecommendList.count == 0 && self.currentPage == 1) {
            NSLog(@"[NewHomeViewController] Today recommend loading timeout");
            [self showErrorRecoveryUI:@"推荐内容加载超时"];
            [self.collectionView.mj_header endRefreshing];
            [self.collectionView.mj_footer endRefreshing];
        }
    });
    
    [[JXAPIService sharedService] getDailyRecommendWithPage:self.currentPage pageSize:9 success:^(id responseObject) {
        if ([responseObject[@"code"] intValue] == 0 || [responseObject[@"code"] intValue] == 200) {
            NSArray *list = responseObject[@"data"][@"list"];
            if (list && [list isKindOfClass:[NSArray class]]) {
                if (self.currentPage == 1) {
                    [self.todayRecommendList removeAllObjects];
                }
                [self.todayRecommendList addObjectsFromArray:list];
                [self.collectionView reloadData];
                
                NSLog(@"[NewHomeViewController] Today recommend loaded: page=%ld, count=%lu",
                      (long)self.currentPage, (unsigned long)list.count);
            }
        }
        [self.collectionView.mj_header endRefreshing];
        [self.collectionView.mj_footer endRefreshing];
    } failure:^(NSError *error) {
        NSLog(@"[NewHomeViewController] Failed to load today recommend: %@", error);
        [self handleLoadingError:error section:@"推荐内容"];
        [self.collectionView.mj_header endRefreshing];
        [self.collectionView.mj_footer endRefreshing];
    }];
}

#pragma mark - Error Recovery

- (void)handleLoadingError:(NSError *)error section:(NSString *)sectionName {
    // 记录错误信息
    NSLog(@"[NewHomeViewController] Loading error - Section: %@, Error: %@", sectionName, error.localizedDescription);
    
    // 区分错误类型
    NSString *errorDesc = @"加载失败，请检查网络连接";
    if ([error.domain isEqualToString:NSURLErrorDomain]) {
        switch (error.code) {
            case NSURLErrorTimedOut:
                errorDesc = @"加载超时，请重试";
                break;
            case NSURLErrorNotConnectedToInternet:
            case NSURLErrorNetworkConnectionLost:
                errorDesc = @"网络连接失败";
                break;
            case NSURLErrorCannotFindHost:
                errorDesc = @"无法连接到服务器";
                break;
            default:
                break;
        }
    }
    
    // 触发降级显示和用户提示
    [self showErrorRecoveryUI:errorDesc];
}

- (void)showErrorRecoveryUI:(NSString *)errorMessage {
    // 初始化为空数据（降级显示）
    if (!self.headerData) {
        self.headerData = [[JXHomeHeaderData alloc] init];
        self.headerData.banners = @[];
        self.headerData.hotMovies = @[];
        self.headerData.hotDramas = @[];
        NSLog(@"[NewHomeViewController] Degradation mode: empty data initialized");
    }
    
    // 重新加载 UI
    [self.collectionView reloadData];
    
    // 显示错误提示（弱通知方式，不阻挡 UI）
    dispatch_async(dispatch_get_main_queue(), ^{
        // 可选：显示简短的 toast 或横幅提示
        NSLog(@"[NewHomeViewController] Show degradation notice: %@", errorMessage);
        
        // 如果有必要可以显示一个小的错误横幅
        // [self showErrorBanner:errorMessage];
    });
}

// 显示错误提示 banner（可选，当需要时取消注释）
- (void)showErrorBanner:(NSString *)message {
    // 创建错误提示 banner
    UIView *bannerView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, self.view.bounds.size.width, 44)];
    bannerView.backgroundColor = [UIColor colorWithRed:1.0 green:0.3 blue:0.3 alpha:0.9];
    bannerView.tag = 9999;
    
    UILabel *label = [[UILabel alloc] initWithFrame:CGRectInset(bannerView.bounds, 12, 0)];
    label.text = message;
    label.textColor = [UIColor whiteColor];
    label.font = [UIFont systemFontOfSize:14];
    label.textAlignment = NSTextAlignmentCenter;
    label.numberOfLines = 1;
    [bannerView addSubview:label];
    
    [self.view addSubview:bannerView];
    
    // 3 秒后自动移除
    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(3 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
        [UIView animateWithDuration:0.3 animations:^{
            bannerView.alpha = 0;
        } completion:^(BOOL finished) {
            [bannerView removeFromSuperview];
        }];
    });
}

- (void)refreshData {
    self.currentPage = 1;
    [self loadHomeData];
}

- (void)loadMoreData {
    if (self.currentPage >= 10) {
        [self.collectionView.mj_footer endRefreshingWithNoMoreData];
        return;
    }
    self.currentPage++;
    [self loadTodayRecommend];
}

#pragma mark - Search

- (void)performSearchWithKeyword:(NSString *)keyword {
    if (keyword.length == 0) {
        return;
    }
    
    SearchResultViewController *vc = [[SearchResultViewController alloc] init];
    vc.txt = keyword;
    vc.hidesBottomBarWhenPushed = YES;
    [self.navigationController pushViewController:vc animated:YES];
}

#pragma mark - UICollectionViewDataSource

- (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView {
    return 3;  // Banner + HotRecommend + TodayRecommend
}

- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {
    if (section == HomeSectionTypeBanner) {
        return (self.headerData.banners.count > 0) ? 1 : 0;
    } else if (section == HomeSectionTypeHotRecommend) {
        NSArray *hotItems = [self.headerData getAllHotRecommends];
        return (hotItems.count > 0) ? 1 : 0;
    } else {
        return self.todayRecommendList.count;
    }
}

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
    if (indexPath.section == HomeSectionTypeTodayRecommend) {
        // 今日推荐网格
        HomeGridCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:kHomeGridCellIdentifier forIndexPath:indexPath];
        
        // 防护检查：确保数据存在
        if (indexPath.item >= self.todayRecommendList.count) {
            NSLog(@"[NewHomeViewController] Warning: Index out of bounds for todayRecommendList");
            cell.titleLabel.text = @"";
            return cell;
        }
        
        NSDictionary *item = self.todayRecommendList[indexPath.item];
        if (!item || ![item isKindOfClass:[NSDictionary class]]) {
            NSLog(@"[NewHomeViewController] Warning: Invalid item data at index %ld", (long)indexPath.item);
            cell.titleLabel.text = @"";
            return cell;
        }
        
        cell.titleLabel.text = item[@"name"] ?: @"";
        
        NSString *coverUrl = item[@"v_cover_url"] ?: item[@"h_cover_url"];
        if (coverUrl) {
            [cell.coverImageView sd_setImageWithURL:[NSURL URLWithString:coverUrl]
                                   placeholderImage:nil];
        }
        
        return cell;
    } else {
        // Banner 和 HotRecommend 使用自定义 View
        UICollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"CustomCell" forIndexPath:indexPath];
        
        // 清除旧的子视图
        for (UIView *view in cell.contentView.subviews) {
            [view removeFromSuperview];
        }
        
        if (indexPath.section == HomeSectionTypeBanner) {
            // Banner
            if (!self.bannerView) {
                self.bannerView = [[JXBannerView alloc] init];
                __weak typeof(self) weakSelf = self;
                self.bannerView.onBannerClick = ^(JXBannerItem *item) {
                    [weakSelf handleItemClick:item];
                };
            }
            
            // 防护检查
            if (self.headerData && self.headerData.banners && self.headerData.banners.count > 0) {
                [self.bannerView updateBanners:self.headerData.banners];
            } else {
                [self.bannerView updateBanners:@[]];
            }
            
            [cell.contentView addSubview:self.bannerView];
            [self.bannerView mas_makeConstraints:^(MASConstraintMaker *make) {
                make.edges.equalTo(cell.contentView);
            }];
        } else if (indexPath.section == HomeSectionTypeHotRecommend) {
            // 热门推荐
            if (!self.hotRecommendView) {
                self.hotRecommendView = [[JXHotRecommendView alloc] init];
                __weak typeof(self) weakSelf = self;
                self.hotRecommendView.onItemClick = ^(JXBannerItem *item) {
                    [weakSelf handleItemClick:item];
                };
            }
            
            // 防护检查
            NSArray *hotItems = @[];
            if (self.headerData) {
                NSArray *temp = [self.headerData getAllHotRecommends];
                if (temp) {
                    hotItems = temp;
                }
            }
            
            [self.hotRecommendView updateItems:hotItems];
            [cell.contentView addSubview:self.hotRecommendView];
            [self.hotRecommendView mas_makeConstraints:^(MASConstraintMaker *make) {
                make.edges.equalTo(cell.contentView);
            }];
        }
        
        return cell;
    }
}

#pragma mark - UICollectionViewDelegate

- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath {
    if (indexPath.section == HomeSectionTypeTodayRecommend) {
        // 今日推荐点击
        // 防护检查
        if (indexPath.item >= self.todayRecommendList.count) {
            NSLog(@"[NewHomeViewController] Warning: Index out of bounds in didSelectItemAtIndexPath");
            return;
        }
        
        NSDictionary *item = self.todayRecommendList[indexPath.item];
        if (!item || ![item isKindOfClass:[NSDictionary class]]) {
            NSLog(@"[NewHomeViewController] Warning: Invalid item data in didSelectItemAtIndexPath");
            return;
        }
        
        JXBannerItem *bannerItem = [JXBannerItem modelWithDictionary:item];
        if (bannerItem) {
            [self handleItemClick:bannerItem];
        }
    }
}

#pragma mark - UICollectionViewDelegateFlowLayout

- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath {
    CGFloat width = collectionView.bounds.size.width;
    
    if (indexPath.section == HomeSectionTypeBanner) {
        // Banner: 全宽，16:9 比例
        return CGSizeMake(width, width * 9.0 / 16.0);
    } else if (indexPath.section == HomeSectionTypeHotRecommend) {
        // 热门推荐: 全宽，固定高度
        return CGSizeMake(width, 240);
    } else {
        // 今日推荐: 3列网格
        CGFloat itemWidth = (width - 12 * 2 - 8 * 2) / 3.0;  // 减去左右边距和列间距
        return CGSizeMake(itemWidth, itemWidth * 1.7);  // 封面 + 标题
    }
}

- (UIEdgeInsets)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout insetForSectionAtIndex:(NSInteger)section {
    if (section == HomeSectionTypeBanner || section == HomeSectionTypeHotRecommend) {
        return UIEdgeInsetsZero;
    }
    return UIEdgeInsetsMake(12, 12, 12, 12);
}

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

- (CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout minimumInteritemSpacingForSectionAtIndex:(NSInteger)section {
    if (section == HomeSectionTypeTodayRecommend) {
        return 8;
    }
    return 0;
}

#pragma mark - Handle Click

- (void)handleItemClick:(JXBannerItem *)item {
    // 判断是短剧还是影片
    if ([item.categories containsString:@"短剧"]) {
        NSLog(@"[NewHomeViewController] 点击短剧: jxDramaId=%ld, name=%@", (long)item.itemId, item.name);
        // 跳转到短剧播放器
        JXShortDramaViewController *vc = [[JXShortDramaViewController alloc] init];
        // TODO: 设置初始短剧ID和集数
        vc.hidesBottomBarWhenPushed = YES;
        [self.navigationController pushViewController:vc animated:YES];
    } else {
        NSLog(@"[NewHomeViewController] 点击影片: id=%ld, name=%@", (long)item.itemId, item.name);
        // TODO: 跳转到普通影片播放器
        // MoviePlayActivity.launchMoviePlay(requireContext(), item.itemId)
    }
}

@end