//
//  QuotationViewController.m
//  HC
//
//  Created by huilinLi on 2025/11/26.
//

#import "QuotationViewController.h"
#import "CountryModel.h"
#import "MLXYViewController.h"   // 马来西亚
#import "CNViewController.h"   // 中国
#import "CommonTabBar.h"
#import "HomeViewController.h"
#import "MyViewController.h"

@interface QuotationViewController () <UICollectionViewDelegate, UICollectionViewDataSource>
@property (nonatomic, strong) CommonTabBar *commonTabBar;
@property (nonatomic, strong) NSArray<CountryModel *> *countries;       // 国家列表
@property (nonatomic, strong) UIViewController *currentChildVC;         // 当前显示的子控制器
@property (nonatomic, strong) UICollectionView *countryTabBar;          // 国家选择标签栏
@property (nonatomic, strong) UIView *contentContainer;                 // 子控制器容器
@property (nonatomic, assign) NSInteger selectedIndex;                  // 当前选中的国家索引

// 顶部
@property (nonatomic, strong) UIImageView *logoImage;                   // logo
@property (nonatomic, strong) UITextField *searchField;                 // 搜索框
@property (nonatomic, strong) UIImageView *flagIcon;                    // 国旗
@end

@implementation QuotationViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    self.view.backgroundColor = [UIColor blackColor];
    
    [self initCountries];
    [self setupSubviews];
    [self setupConstraints];
    
    // 默认选中第一个
    self.selectedIndex = 0;
    [self switchToCountryAtIndex:self.selectedIndex];
}

#pragma mark - 初始化国家数据
- (void)initCountries {
    self.countries = @[
        [CountryModel modelWithCode:@"MY"
                              name:@"马来西亚"
                        vcClassName:NSStringFromClass([MLXYViewController class])],
        [CountryModel modelWithCode:@"CN"
                              name:@"中国"
                          vcClassName:NSStringFromClass([CNViewController class])],
        [CountryModel modelWithCode:@"CN"
                              name:@"中国"
                          vcClassName:NSStringFromClass([CNViewController class])],
        [CountryModel modelWithCode:@"CN"
                              name:@"中国"
                          vcClassName:NSStringFromClass([CNViewController class])],
        [CountryModel modelWithCode:@"CN"
                              name:@"中国"
                          vcClassName:NSStringFromClass([CNViewController class])],
    ];
}

#pragma mark - 创建子视图
- (void)setupSubviews {
    self.logoImage = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"logo"]];
    self.logoImage.contentMode = UIViewContentModeScaleAspectFit;
    self.logoImage.translatesAutoresizingMaskIntoConstraints = NO;
    [self.view addSubview:self.logoImage];
    
    self.searchField = [[UITextField alloc] init];
    self.searchField.placeholder = @"股票名称/代码";
    NSAttributedString *placeholder = [[NSAttributedString alloc] initWithString:@"股票名称/代码" attributes:@{
        NSForegroundColorAttributeName: [UIColor whiteColor]
    }];
    self.searchField.attributedPlaceholder = placeholder;
    self.searchField.textColor = [UIColor whiteColor];
    self.searchField.backgroundColor = [UIColor colorWithRed:0.2 green:0.2 blue:0.2 alpha:1];
    self.searchField.layer.cornerRadius = 15;
    self.searchField.leftView = [[UIImageView alloc] initWithImage:[UIImage systemImageNamed:@"magnifyingglass"]];
    self.searchField.leftViewMode = UITextFieldViewModeAlways;
    self.searchField.translatesAutoresizingMaskIntoConstraints = NO;
    [self.view addSubview:self.searchField];
    
    self.flagIcon = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"logo"]];
    self.flagIcon.contentMode = UIViewContentModeScaleAspectFit;
    self.flagIcon.translatesAutoresizingMaskIntoConstraints = NO;
    [self.view addSubview:self.flagIcon];
    
    UICollectionViewFlowLayout *tabLayout = [[UICollectionViewFlowLayout alloc] init];
    tabLayout.scrollDirection = UICollectionViewScrollDirectionHorizontal;// 横向滚动
    tabLayout.itemSize = CGSizeMake(100, 40); // 每个标签宽100，高40
    tabLayout.minimumInteritemSpacing = 0;
    
    self.countryTabBar = [[UICollectionView alloc] initWithFrame:CGRectZero collectionViewLayout:tabLayout];
    self.countryTabBar.backgroundColor = [UIColor blackColor];
    self.countryTabBar.delegate = self;
    self.countryTabBar.dataSource = self;
    [self.countryTabBar registerClass:[UICollectionViewCell class]// 单元格复用类
           forCellWithReuseIdentifier:@"CountryTabCell"];
    self.countryTabBar.translatesAutoresizingMaskIntoConstraints = NO;
    [self.view addSubview:self.countryTabBar];
    
    // 5. 内容容器，这个承接子视图
    self.contentContainer = [[UIView alloc] init];
    self.contentContainer.backgroundColor = [UIColor blackColor];
    self.contentContainer.translatesAutoresizingMaskIntoConstraints = NO;
    [self.view addSubview:self.contentContainer];
    
    NSArray *tabItems = @[
        @{@"title":@"首页", @"icon":@"house.fill", @"selected":@NO},
        @{@"title":@"行情", @"icon":@"chart.line.uptrend.xyaxis", @"selected":@YES},
        @{@"title":@"自选", @"icon":@"plus", @"selected":@NO},
        @{@"title":@"我的", @"icon":@"person", @"selected":@NO}
    ];
    self.commonTabBar = [[CommonTabBar alloc] initWithTabItems:tabItems];
    self.commonTabBar.delegate = self;
    self.commonTabBar.translatesAutoresizingMaskIntoConstraints = NO;
    [self.view addSubview:self.commonTabBar];
}

#pragma mark - 布局约束
- (void)setupConstraints {
    // Logo
    [NSLayoutConstraint activateConstraints:@[
        [self.logoImage.centerYAnchor constraintEqualToAnchor:self.searchField.centerYAnchor],
        [self.logoImage.leadingAnchor constraintEqualToAnchor:self.view.leadingAnchor constant:15],
        [self.logoImage.widthAnchor constraintEqualToConstant:40],
        [self.logoImage.heightAnchor constraintEqualToConstant:40]
    ]];
    
    // 搜索框
    [NSLayoutConstraint activateConstraints:@[
        [self.searchField.topAnchor constraintEqualToAnchor:self.view.topAnchor constant:50],
        [self.searchField.leadingAnchor constraintEqualToAnchor:self.logoImage.trailingAnchor constant:10],
        [self.searchField.trailingAnchor constraintEqualToAnchor:self.flagIcon.leadingAnchor constant:-10],
        [self.searchField.heightAnchor constraintEqualToConstant:30]
    ]];
    
    // 国旗
    [NSLayoutConstraint activateConstraints:@[
        [self.flagIcon.centerYAnchor constraintEqualToAnchor:self.searchField.centerYAnchor],
        [self.flagIcon.trailingAnchor constraintEqualToAnchor:self.view.trailingAnchor constant:-15],
        [self.flagIcon.widthAnchor constraintEqualToConstant:40],
        [self.flagIcon.heightAnchor constraintEqualToConstant:40]
    ]];
    
    // 国家
    [NSLayoutConstraint activateConstraints:@[
        [self.countryTabBar.topAnchor constraintEqualToAnchor:self.searchField.bottomAnchor constant:15],
        [self.countryTabBar.leadingAnchor constraintEqualToAnchor:self.view.leadingAnchor],
        [self.countryTabBar.trailingAnchor constraintEqualToAnchor:self.view.trailingAnchor],
        [self.countryTabBar.heightAnchor constraintEqualToConstant:40]
    ]];
    
    // 子视图容器
    [NSLayoutConstraint activateConstraints:@[
        [self.contentContainer.topAnchor constraintEqualToAnchor:self.countryTabBar.bottomAnchor],
        [self.contentContainer.leadingAnchor constraintEqualToAnchor:self.view.leadingAnchor],
        [self.contentContainer.trailingAnchor constraintEqualToAnchor:self.view.trailingAnchor],
        [self.contentContainer.bottomAnchor constraintEqualToAnchor:self.commonTabBar.topAnchor]
    ]];
    
    // 底部TabBar
    [NSLayoutConstraint activateConstraints:@[
        [self.commonTabBar.bottomAnchor constraintEqualToAnchor:self.view.safeAreaLayoutGuide.bottomAnchor],
        [self.commonTabBar.leadingAnchor constraintEqualToAnchor:self.view.leadingAnchor],
        [self.commonTabBar.trailingAnchor constraintEqualToAnchor:self.view.trailingAnchor]
    ]];
}

#pragma mark - 切换子控制器
- (void)switchToCountryAtIndex:(NSInteger)index {
    // 先移除
    if (self.currentChildVC) {
        [self.currentChildVC willMoveToParentViewController:nil];
        [self.currentChildVC.view removeFromSuperview];
        [self.currentChildVC removeFromParentViewController];
        self.currentChildVC = nil;
    }
    
    // 创建新的
    CountryModel *selectedCountry = self.countries[index];
    Class childVCClass = NSClassFromString(selectedCountry.vcClassName);// 字符串转Class？？？？
    UIViewController *childVC = [[childVCClass alloc] init];
    
    // 添加
    [self addChildViewController:childVC];
    childVC.view.frame = self.contentContainer.bounds;// 适配容器
    childVC.view.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;// 自适应容器大小
    [self.contentContainer addSubview:childVC.view];
    [childVC didMoveToParentViewController:self];
    
    self.currentChildVC = childVC;
}

#pragma mark - 国家数据源
- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {
    return self.countries.count;
}

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
    UICollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"CountryTabCell" forIndexPath:indexPath];
    cell.backgroundColor = [UIColor blackColor];
    
    // 国家名称
    UILabel *nameLabel = [cell viewWithTag:100];
    if (!nameLabel) {
        nameLabel = [[UILabel alloc] init];
        nameLabel.tag = 100;
        nameLabel.textColor = [UIColor whiteColor];
        nameLabel.font = [UIFont systemFontOfSize:15];
        nameLabel.textAlignment = NSTextAlignmentCenter;
        [cell.contentView addSubview:nameLabel];
        nameLabel.frame = cell.contentView.bounds;// 撑满单元格
    }
    nameLabel.text = self.countries[indexPath.item].name;
    
    // 选中下划线
    UIView *selectedLine = [cell viewWithTag:101];
    if (!selectedLine) {
        selectedLine = [[UIView alloc] init];
        selectedLine.tag = 101;
        selectedLine.backgroundColor = [UIColor blueColor];
        [cell.contentView addSubview:selectedLine];
        selectedLine.frame = CGRectMake(30, cell.contentView.bounds.size.height - 7, 40, 4);
    }
    selectedLine.hidden = !(indexPath.item == self.selectedIndex);
    
    return cell;
}

- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath {
    self.selectedIndex = indexPath.item;
    [self.countryTabBar reloadData]; // 刷新标签选中状态
    [self switchToCountryAtIndex:indexPath.item]; // 切换到对应国家页面
}

#pragma mark - 底部跳转方法
- (void)tabBarDidSelectIndex:(NSInteger)index {
    switch (index) {
        case 0:
            [self pushHome];
            break;
        case 1:
            break;
        case 2:
            break;
        case 3:
            [self pushMine];
            break;
    }
}

- (void) pushMine {
    MyViewController *myViewController = [[MyViewController alloc] init];
    [self.navigationController pushViewController:myViewController animated:YES];
}

- (void) pushHome {
    HomeViewController *myViewController = [[HomeViewController alloc] init];
    [self.navigationController pushViewController:myViewController animated:YES];
}

@end