//
//  XJHealthKnowledgeView.m
//  XinjiangProject
//
//  Created by Apple on 2026/6/29.
//

#import "XJHealthKnowledgeView.h"
#import "XJHealthKnowledgeModel.h"
#import "XJHealthKnowledgeCell.h"

static CGFloat const kHeaderHeight     = 40;
static CGFloat const kSearchBoxHeight  = 36;
static CGFloat const kCellHeight       = 130;
static CGFloat const kMaxCellCount     = 3;
static CGFloat const kTabButtonGap     = 43;
static CGFloat const kDefaultEmptyHeight = 200;

// 标签区：文字 14pt(≈17) + 指示间距6 + 指示2 + 分割间距9 + 分割1 = ~35
static CGFloat const kTabAreaHeight    = 48;

@interface XJHealthKnowledgeView () <UITableViewDelegate, UITableViewDataSource, UITextFieldDelegate>

@property (nonatomic, strong) UIView       * headerView;
@property (nonatomic, strong) UIImageView  * headerBgImg;
@property (nonatomic, strong) UILabel      * titleLabel;
@property (nonatomic, strong) UIButton     * moreBtn;

@property (nonatomic, strong) UIView       * searchContainer;
@property (nonatomic, strong) UIImageView  * searchIcon;
@property (nonatomic, strong) UITextField  * searchTextField;
@property (nonatomic, strong) UIButton     * searchBtn;

@property (nonatomic, strong) UIScrollView               * tabScrollView;
@property (nonatomic, strong) NSMutableArray<UIButton *> * tabButtons;
@property (nonatomic, strong) UIView                     * indicatorView;
@property (nonatomic, strong) UIView                     * tabSeparator;

@property (nonatomic, strong) UITableView  * listTableView;
@property (nonatomic, strong) UILabel      * emptyLabel;

@end

@implementation XJHealthKnowledgeView

- (instancetype)initWithFrame:(CGRect)frame {
    if (self = [super initWithFrame:frame]) {
        self.backgroundColor = KWhiteColor;
        self.layer.cornerRadius = 12;
        self.layer.masksToBounds = YES;
        self.tabButtons = [[NSMutableArray alloc] init];
        [self createUI];
    }
    return self;
}

#pragma mark - ————— UI 搭建 —————

- (void)createUI {

    // 头部
    self.headerView = [[UIView alloc] init];
    [self addSubview:self.headerView];
    [self.headerView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.left.right.top.mas_offset(0);
        make.height.mas_offset(kRealValue(kHeaderHeight));
    }];

    self.headerBgImg = [[UIImageView alloc] init];
    self.headerBgImg.image = [UIImage imageNamed:@"heaedTitleBackImg"];
    [self.headerView addSubview:self.headerBgImg];
    [self.headerBgImg mas_makeConstraints:^(MASConstraintMaker *make) {
        make.edges.mas_offset(0);
    }];

    self.titleLabel = [[UILabel alloc] init];
    self.titleLabel.text = @"健康知识";
    self.titleLabel.textColor = CFontColor1;
    self.titleLabel.font = BOLDSYSTEMFONT(16);
    [self.headerView addSubview:self.titleLabel];
    [self.titleLabel mas_makeConstraints:^(MASConstraintMaker *make) {
        make.left.mas_offset(13);
        make.centerY.mas_equalTo(self.headerView);
    }];

    self.moreBtn = [[UIButton alloc] init];
    [self.moreBtn setImage:[UIImage imageNamed:@"wacthRightAccow"] forState:UIControlStateNormal];
    [self.moreBtn addTarget:self action:@selector(moreAction) forControlEvents:UIControlEventTouchUpInside];
    [self.headerView addSubview:self.moreBtn];
    [self.moreBtn mas_makeConstraints:^(MASConstraintMaker *make) {
        make.right.mas_offset(-8);
        make.centerY.mas_equalTo(self.headerView);
        make.width.height.mas_offset(30);
    }];

    // 搜索框 - 圆角 18 背景 #F5F7FB
    self.searchContainer = [[UIView alloc] init];
    self.searchContainer.backgroundColor = UIColorHex(#F5F7FB);
    self.searchContainer.layer.cornerRadius = 18;
    self.searchContainer.layer.masksToBounds = YES;
    self.searchContainer.hidden = YES; // 初始隐藏，等数据来了再显示
    [self addSubview:self.searchContainer];
    [self.searchContainer mas_makeConstraints:^(MASConstraintMaker *make) {
        make.left.mas_offset(15);
        make.right.mas_offset(-15);
        make.top.mas_equalTo(self.headerView.mas_bottom).offset(10);
        make.height.mas_offset(kSearchBoxHeight);
    }];

    self.searchIcon = [[UIImageView alloc] init];
    self.searchIcon.image = [UIImage imageNamed:@"searchLeftIcon"];
    self.searchIcon.contentMode = UIViewContentModeScaleAspectFit;
    [self.searchContainer addSubview:self.searchIcon];
    [self.searchIcon mas_makeConstraints:^(MASConstraintMaker *make) {
        make.left.mas_offset(15);
        make.centerY.mas_equalTo(self.searchContainer);
        make.width.height.mas_offset(14);
    }];

    self.searchBtn = [[UIButton alloc] init];
    self.searchBtn.backgroundColor = UIColorHex(#14BEBE);
    self.searchBtn.layer.cornerRadius = 14;
    self.searchBtn.layer.masksToBounds = YES;
    [self.searchBtn setTitle:@"搜索" forState:UIControlStateNormal];
    [self.searchBtn setTitleColor:KWhiteColor forState:UIControlStateNormal];
    self.searchBtn.titleLabel.font = MEDIUMFONT(14);
    [self.searchBtn addTarget:self action:@selector(searchAction) forControlEvents:UIControlEventTouchUpInside];
    [self.searchContainer addSubview:self.searchBtn];
    [self.searchBtn mas_makeConstraints:^(MASConstraintMaker *make) {
        make.right.mas_offset(0);
        make.centerY.mas_equalTo(self.searchContainer);
        make.width.mas_offset(55);
        make.height.mas_offset(28);
    }];

    self.searchTextField = [[UITextField alloc] init];
    self.searchTextField.placeholder = @"请输入关键字进行搜索";
    self.searchTextField.font = [UIFont systemFontOfSize:13 weight:UIFontWeightRegular];
    self.searchTextField.textColor = UIColorHex(#252535);
    // placeholder 颜色
    self.searchTextField.attributedPlaceholder = [[NSAttributedString alloc]
        initWithString:@"请输入关键字进行搜索"
            attributes:@{NSForegroundColorAttributeName: UIColorHex(#B6B6B6)}];
    self.searchTextField.delegate = self;
    [self.searchContainer addSubview:self.searchTextField];
    [self.searchTextField mas_makeConstraints:^(MASConstraintMaker *make) {
        make.left.mas_equalTo(self.searchIcon.mas_right).offset(8);
        make.right.mas_equalTo(self.searchBtn.mas_left).offset(-8);
        make.centerY.mas_equalTo(self.searchContainer);
        make.height.mas_equalTo(self.searchContainer);
    }];

    // 标签切换区
    self.tabScrollView = [[UIScrollView alloc] init];
    self.tabScrollView.showsHorizontalScrollIndicator = NO;
    self.tabScrollView.showsVerticalScrollIndicator = NO;
    self.tabScrollView.hidden = YES; // 初始隐藏
    [self addSubview:self.tabScrollView];
    [self.tabScrollView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.left.right.mas_offset(0);
        make.top.mas_equalTo(self.searchContainer.mas_bottom).offset(12);
        make.height.mas_offset(kTabAreaHeight);
    }];

    // 指示条 13×2
    self.indicatorView = [[UIView alloc] init];
    self.indicatorView.backgroundColor = UIColorHex(#14BEBE);
    self.indicatorView.layer.cornerRadius = 1;
    self.indicatorView.layer.masksToBounds = YES;
    self.indicatorView.hidden = YES;
    [self.tabScrollView addSubview:self.indicatorView];

    // 分割线 在指示条底部 +9
    self.tabSeparator = [[UIView alloc] init];
    self.tabSeparator.backgroundColor = UIColorHex(#EAECF1);
    [self.tabScrollView addSubview:self.tabSeparator];

    // 列表
    self.listTableView = [[UITableView alloc] initWithFrame:CGRectZero style:UITableViewStylePlain];
    self.listTableView.delegate = self;
    self.listTableView.dataSource = self;
    self.listTableView.separatorStyle = UITableViewCellSeparatorStyleNone;
    self.listTableView.scrollEnabled = NO;
    self.listTableView.rowHeight = kCellHeight;
    self.listTableView.backgroundColor = KWhiteColor;
    self.listTableView.hidden = YES; // 初始隐藏
    if (@available(iOS 15.0, *)) {
        self.listTableView.sectionHeaderTopPadding = 0;
    }
    [self addSubview:self.listTableView];
    [self.listTableView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.left.right.mas_offset(0);
        make.top.mas_equalTo(self.tabScrollView.mas_bottom);
        make.height.mas_offset(0);
    }];

    // 空状态 - 放在 tabScrollView 下方
    self.emptyLabel = [[UILabel alloc] init];
    self.emptyLabel.text = @"暂无健康知识";
    self.emptyLabel.textColor = UIColorHex(#14BEBE);
    self.emptyLabel.font = [UIFont systemFontOfSize:15];
    self.emptyLabel.textAlignment = NSTextAlignmentCenter;
    self.emptyLabel.hidden = YES;
    [self addSubview:self.emptyLabel];
    [self.emptyLabel mas_makeConstraints:^(MASConstraintMaker *make) {
        make.centerX.mas_equalTo(self);
        make.top.mas_equalTo(self.tabScrollView.mas_bottom).offset(40);
    }];
}

#pragma mark - ————— Setter —————

- (void)setDataArray:(NSArray<XJHealthKnowledgeModel *> *)dataArray {
    _dataArray = dataArray;

    BOOL hasData = dataArray.count > 0;

    self.listTableView.hidden = !hasData;
    self.emptyLabel.hidden = hasData;

    if (hasData) {
        [self.listTableView reloadData];
        CGFloat tableH = MIN(dataArray.count, kMaxCellCount) * kCellHeight;
        [self.listTableView mas_remakeConstraints:^(MASConstraintMaker *make) {
            make.left.right.mas_offset(0);
            make.top.mas_equalTo(self.tabScrollView.mas_bottom);
            make.height.mas_offset(tableH);
        }];
    } else {
        [self.listTableView mas_remakeConstraints:^(MASConstraintMaker *make) {
            make.left.right.mas_offset(0);
            make.top.mas_equalTo(self.tabScrollView.mas_bottom);
            make.height.mas_offset(0);
        }];
    }
}

- (void)setTabTitles:(NSArray<NSString *> *)tabTitles {
    _tabTitles = tabTitles;

    for (UIButton * btn in self.tabButtons) {
        [btn removeFromSuperview];
    }
    [self.tabButtons removeAllObjects];

    self.tabScrollView.hidden = (tabTitles.count == 0);
    self.searchContainer.hidden = (tabTitles.count == 0);

    if (tabTitles.count == 0) {
        self.indicatorView.hidden = YES;
        return;
    }

    self.indicatorView.hidden = NO;

    // 按钮高度给满 kTabAreaHeight 让点击范围大
    CGFloat btnHeight = kTabAreaHeight - 2 - 6 - 9 - 1; // 文字区域 ≈30pt
    CGFloat btnTop = 0;

    CGFloat leftOffset = 15;
    for (NSInteger i = 0; i < tabTitles.count; i++) {
        NSString * title = tabTitles[i];

        CGSize textSize = [title sizeWithAttributes:@{NSFontAttributeName: BOLDSYSTEMFONT(14)}];
        CGFloat btnWidth = ceil(textSize.width) + 4; // 左右各留 2pt

        // 透明大按钮包住文字区域
        UIButton * btn = [UIButton buttonWithType:UIButtonTypeCustom];
        [btn setTitle:title forState:UIControlStateNormal];
        btn.titleLabel.font = (i == self.selectedTabIndex) ? BOLDSYSTEMFONT(14) : [UIFont systemFontOfSize:14 weight:UIFontWeightRegular];
        [btn setTitleColor:(i == self.selectedTabIndex) ? UIColorHex(#14BEBE) : UIColorHex(#808080) forState:UIControlStateNormal];
        btn.backgroundColor = KClearColor;
        btn.tag = i;
        [btn addTarget:self action:@selector(tabButtonTapped:) forControlEvents:UIControlEventTouchUpInside];
        btn.frame = CGRectMake(leftOffset, btnTop, btnWidth, btnHeight);
        [self.tabScrollView addSubview:btn];
        [self.tabButtons addObject:btn];

        leftOffset += btnWidth + kTabButtonGap;
    }

    leftOffset += 15 - kTabButtonGap;
    self.tabScrollView.contentSize = CGSizeMake(leftOffset, kTabAreaHeight);

    // 更新分割线位置：在标签区底部
    self.tabSeparator.frame = CGRectMake(0, kTabAreaHeight - 1, MAX(leftOffset, self.tabScrollView.bounds.size.width), 1);

    // 强制布局，确保按钮 titleLabel.frame 计算正确
    [self.tabScrollView layoutIfNeeded];

    if (self.tabButtons.count > 0) {
        [self updateIndicatorPosition:self.selectedTabIndex animated:NO];
    }
}

- (void)setSelectedTabIndex:(NSInteger)selectedTabIndex {
    if (selectedTabIndex < 0 || selectedTabIndex >= self.tabButtons.count) return;
    _selectedTabIndex = selectedTabIndex;

    for (NSInteger i = 0; i < self.tabButtons.count; i++) {
        UIButton * btn = self.tabButtons[i];
        if (i == selectedTabIndex) {
            [btn setTitleColor:UIColorHex(#14BEBE) forState:UIControlStateNormal];
            btn.titleLabel.font = BOLDSYSTEMFONT(14);
        } else {
            [btn setTitleColor:UIColorHex(#808080) forState:UIControlStateNormal];
            btn.titleLabel.font = [UIFont systemFontOfSize:14 weight:UIFontWeightRegular];
        }
    }
    [self.tabScrollView layoutIfNeeded];
    [self updateIndicatorPosition:selectedTabIndex animated:YES];
}

- (void)showNotLoggedInPlaceholder {
    self.dataArray = @[];
    self.tabTitles = nil;
    self.emptyLabel.text = @"暂未登录";
    self.emptyLabel.textColor = [UIColor colorWithRed:0.6 green:0.6 blue:0.6 alpha:1.0];
    self.emptyLabel.hidden = NO;
    // 未登录时在头部下方区域上下居中
    [self.emptyLabel mas_remakeConstraints:^(MASConstraintMaker *make) {
        make.centerX.mas_equalTo(self);
        make.top.mas_equalTo(self.headerView.mas_bottom);
        make.bottom.mas_equalTo(self);
    }];
}

#pragma mark - ————— 高度计算 —————

- (CGFloat)totalHeight {
    BOOL hasTabs = self.tabTitles.count > 0;
    BOOL hasData = self.dataArray.count > 0;

    if (!hasTabs) {
        return kDefaultEmptyHeight;
    }

    // 头部(40) + 10 + 搜索(36) + 12 + 标签(48) + 列表/空区域
    CGFloat base = kRealValue(kHeaderHeight) + 10 + kSearchBoxHeight + 12 + kTabAreaHeight;
    if (hasData) {
        CGFloat tableH = MIN(self.dataArray.count, kMaxCellCount) * kCellHeight;
        return base + tableH;
    } else {
        return base + 80;
    }
}

#pragma mark - ————— 私有 —————

- (void)updateIndicatorPosition:(NSInteger)index animated:(BOOL)animated {
    if (index < 0 || index >= self.tabButtons.count) return;

    UIButton * selectedBtn = self.tabButtons[index];

    CGFloat indicatorW = 13;
    CGFloat indicatorH = 2;
    CGFloat indicatorX = selectedBtn.center.x - indicatorW / 2;
    // 文字底部 +6
    CGFloat textBottom = CGRectGetMaxY(selectedBtn.titleLabel.frame);
    // 兜底：14pt 字体行高 ≈ 17，垂直居中
    if (textBottom <= 0) {
        CGFloat lineH = 17;
        textBottom = (selectedBtn.frame.size.height - lineH) / 2.0 + lineH;
    }
    CGFloat indicatorY = textBottom + 6;

    void (^updateBlock)(void) = ^{
        self.indicatorView.frame = CGRectMake(indicatorX, indicatorY, indicatorW, indicatorH);
    };

    if (animated) {
        [UIView animateWithDuration:0.25 animations:updateBlock];
    } else {
        updateBlock();
    }
}

#pragma mark - ————— 事件 —————

- (void)moreAction {
    if (self.moreBlock) self.moreBlock();
}

- (void)searchAction {
    if (self.searchBlock) self.searchBlock(self.searchTextField.text ?: @"");
}

- (void)tabButtonTapped:(UIButton *)sender {
    if (sender.tag == self.selectedTabIndex) return;
    self.selectedTabIndex = sender.tag;
    if (self.tabSelectBlock) self.tabSelectBlock(sender.tag);
}

#pragma mark - ————— UITextFieldDelegate —————

- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField {
    return YES;
}

- (void)textFieldDidBeginEditing:(UITextField *)textField {
    if (self.searchBeginBlock) self.searchBeginBlock();
}

- (BOOL)textFieldShouldReturn:(UITextField *)textField {
    [textField resignFirstResponder];
    if (self.searchBlock) self.searchBlock(textField.text ?: @"");
    return YES;
}

#pragma mark - ————— UITableViewDataSource —————

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    return MIN(self.dataArray.count, kMaxCellCount);
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    static NSString * cellID = @"XJHealthKnowledgeCell";
    XJHealthKnowledgeCell * cell = [tableView dequeueReusableCellWithIdentifier:cellID];
    if (!cell) {
        cell = [[XJHealthKnowledgeCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellID];
    }
    cell.model = self.dataArray[indexPath.row];
    return cell;
}

#pragma mark - ————— UITableViewDelegate —————

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    if (self.cellSelectBlock && indexPath.row < self.dataArray.count) {
        self.cellSelectBlock(self.dataArray[indexPath.row]);
    }
}

@end