//
//  KBLoginVC.m
//  keyBoard
//
//  Created by Mac on 2025/12/2.
//

#import "KBLoginVC.h"
#import <AuthenticationServices/AuthenticationServices.h>
#import "KBLoginVM.h"
#import "AppDelegate.h"
#import "KBEmailRegistVC.h"
#import "KBEmailLoginVC.h"

@interface KBLoginVC () <UITextViewDelegate>

// 背景
@property (nonatomic, strong) UIImageView *bgImageView;          // 整体背景图：login_bg_icon
@property (nonatomic, strong) UIImageView *topRightImageView;    // 顶部右侧装饰图：login_jianp_icon
@property (nonatomic, strong) UIButton *backButton;              // 顶部左侧返回按钮

// 底部白色容器（仅上圆角 26）
@property (nonatomic, strong) UIView *contentContainerView;

// 标题
@property (nonatomic, strong) UILabel *titleLabel;

// 按钮
@property (nonatomic, strong) UIControl *appleLoginButton;       // Apple 原生登录按钮（iOS13 以下降级为普通按钮）
@property (nonatomic, strong) UIButton *emailLoginButton;        // 邮箱登录按钮

// 协议 & 底部文案
@property (nonatomic, strong) UITextView *agreementTextView;     // 底部协议富文本

@property (nonatomic, strong) UILabel *noAccountLabel;           // “Don't Have An Account?”
@property (nonatomic, strong) UIButton *signUpButton;            // “Sign Up”
@property (nonatomic, strong) UIButton *forgotPasswordButton;    // “Forgot Password?”

@end

@implementation KBLoginVC

- (void)viewDidLoad {
    [super viewDidLoad];
    // 使用全屏内容，隐藏自定义导航栏
    self.kb_enableCustomNavBar = NO;
    self.view.backgroundColor = [UIColor whiteColor];
    
    [self setupUI];
}

- (void)viewDidLayoutSubviews {
    [super viewDidLayoutSubviews];
    // 仅白色容器的左上、右上圆角为 26
    if (!CGRectIsEmpty(self.contentContainerView.bounds)) {
        UIRectCorner corners = UIRectCornerTopLeft | UIRectCornerTopRight;
        UIBezierPath *path = [UIBezierPath bezierPathWithRoundedRect:self.contentContainerView.bounds
                                                   byRoundingCorners:corners
                                                         cornerRadii:CGSizeMake(26, 26)];
        CAShapeLayer *mask = [CAShapeLayer layer];
        mask.frame = self.contentContainerView.bounds;
        mask.path = path.CGPath;
        self.contentContainerView.layer.mask = mask;
    }

    // 让按钮内部的图片+文字整体居中，图片与文字间距为 50（按设计稿缩放）
//    if (self.emailLoginButton.currentImage && self.emailLoginButton.currentTitle.length > 0) {
//        [self kb_centerImageAndTitleForButton:self.emailLoginButton spacing:KBFit(50)];
//    }
}

#pragma mark - UI

- (void)setupUI {
    // 背景图
    [self.view addSubview:self.bgImageView];
    [self.bgImageView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.edges.equalTo(self.view);
    }];

    // 顶部左侧返回按钮
    [self.view addSubview:self.backButton];
    [self.backButton mas_makeConstraints:^(MASConstraintMaker *make) {
        make.left.equalTo(self.view).offset(16);
        make.top.equalTo(self.view).offset(KB_StatusBarHeight() + 8);
        make.width.height.mas_equalTo(32);
    }];
    
    // 顶部右侧装饰图
    [self.view addSubview:self.topRightImageView];
    [self.topRightImageView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.top.equalTo(self.view).offset(KB_StatusBarHeight() + KBFit(24));
        make.right.equalTo(self.view).offset(KBFit(10));
        make.width.mas_equalTo(KBFit(244));
        make.height.mas_equalTo(KBFit(224));
    }];
    
    // 底部白色容器
    [self.view addSubview:self.contentContainerView];
    [self.contentContainerView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.left.right.bottom.equalTo(self.view);
        // 顶部位置大致贴合设计稿，可根据实际效果微调
        make.top.equalTo(self.view).offset(KBFit(272));
    }];
    
    // 标题
    [self.contentContainerView addSubview:self.titleLabel];
    [self.titleLabel mas_makeConstraints:^(MASConstraintMaker *make) {
        make.top.equalTo(self.contentContainerView).offset(27);
        make.centerX.equalTo(self.contentContainerView);
    }];
    
    // Apple 登录按钮
    [self.contentContainerView addSubview:self.appleLoginButton];
    [self.appleLoginButton mas_makeConstraints:^(MASConstraintMaker *make) {
        make.top.equalTo(self.titleLabel.mas_bottom).offset(24);
        make.left.equalTo(self.contentContainerView).offset(30);
        make.right.equalTo(self.contentContainerView).offset(-30);
        make.height.mas_equalTo(52);
    }];
    
    // 邮箱登录按钮
    [self.contentContainerView addSubview:self.emailLoginButton];
    [self.emailLoginButton mas_makeConstraints:^(MASConstraintMaker *make) {
        make.top.equalTo(self.appleLoginButton.mas_bottom).offset(15);
        make.left.right.height.equalTo(self.appleLoginButton);
    }];
    
    // 底部协议文案（单个富文本视图，内部 terms/privacy 文案可点击）
    [self.contentContainerView addSubview:self.agreementTextView];
    [self.agreementTextView mas_makeConstraints:^(MASConstraintMaker *make) {
        // 协议文案占满容器左右 30 的留白，配合 textAlignmentCenter 实现真正水平居中
        make.left.equalTo(self.contentContainerView).offset(30);
        make.right.equalTo(self.contentContainerView).offset(-30);
        make.bottom.equalTo(self.contentContainerView).offset(-KB_SAFE_BOTTOM - 84);
    }];
    
    // 底部账号相关文案
    UIButton *forgot = self.forgotPasswordButton;
    [self.contentContainerView addSubview:forgot];
    [forgot mas_makeConstraints:^(MASConstraintMaker *make) {
        make.centerX.equalTo(self.contentContainerView);
        make.bottom.equalTo(self.contentContainerView).offset(-KB_SAFE_BOTTOM - 10);
    }];
    
    UIView *accountLine = [UIView new];
    [self.contentContainerView addSubview:accountLine];
    [accountLine mas_makeConstraints:^(MASConstraintMaker *make) {
        make.centerX.equalTo(self.contentContainerView);
        make.bottom.equalTo(forgot.mas_top).offset(-2);
    }];
    
    [accountLine addSubview:self.noAccountLabel];
    [accountLine addSubview:self.signUpButton];
    
    [self.noAccountLabel mas_makeConstraints:^(MASConstraintMaker *make) {
        make.top.left.bottom.equalTo(accountLine);
    }];
    
    [self.signUpButton mas_makeConstraints:^(MASConstraintMaker *make) {
        make.left.equalTo(self.noAccountLabel.mas_right).offset(4);
        make.right.equalTo(accountLine);
        make.centerY.equalTo(self.noAccountLabel);
    }];
}

#pragma mark - Actions

- (void)onTapAppleLogin {
    KBLOG(@"onTapAppleLogin");
    [[KBLoginVM shared] signInWithAppleFromViewController:KB_CURRENT_NAV completion:^(BOOL success, NSError * _Nullable error) {
        if (success) {
            [KBHUD showInfo:KBLocalized(@"Signed in successfully")];
            // 登录成功后切换到主 TabBar
            dispatch_async(dispatch_get_main_queue(), ^{
                id<UIApplicationDelegate> appDelegate = UIApplication.sharedApplication.delegate;
                if ([appDelegate respondsToSelector:@selector(setupRootVC)]) {
                    AppDelegate *delegate = (AppDelegate *)appDelegate;
                    [delegate toMainTabbarVC];
                }
            });
        } else {
            NSString *msg = error.localizedDescription ?: KBLocalized(@"Sign-in failed");
            [KBHUD showInfo:msg];
        }
    }];
}

- (void)onTapEmailLogin {
    // 后续接入邮箱登录逻辑
    KBLOG(@"onTapEmailLogin");
    KBEmailLoginVC *vc = [[KBEmailLoginVC alloc] init];
    UINavigationController *nav = KB_CURRENT_NAV;
    if ([nav isKindOfClass:[BaseNavigationController class]]) {
        [(BaseNavigationController *)nav kb_pushViewControllerRemovingSameClass:vc animated:YES];
    } else {
        [nav pushViewController:vc animated:YES];
    }
}

- (void)onTapPolicy {
    // 打开服务条款/隐私政策
    KBLOG(@"onTapPolicy");
}

- (void)onTapSignUp {
    // 打开注册页
    KBLOG(@"onTapSignUp");
    KBEmailRegistVC *vc = [[KBEmailRegistVC alloc] init];
    UINavigationController *nav = KB_CURRENT_NAV;
    if ([nav isKindOfClass:[BaseNavigationController class]]) {
        [(BaseNavigationController *)nav kb_pushViewControllerRemovingSameClass:vc animated:YES];
    } else {
        [nav pushViewController:vc animated:YES];
    }
}

- (void)onTapForgotPassword {
    // 打开忘记密码页
    KBLOG(@"onTapForgotPassword");
}

- (void)onTapBack {
    // 与 BaseViewController 的返回逻辑保持一致：优先 pop，其次 dismiss
    if (self.navigationController && self.navigationController.viewControllers.count > 1) {
        [self.navigationController popViewControllerAnimated:YES];
    } else if (self.presentingViewController) {
        [self dismissViewControllerAnimated:YES completion:nil];
    }
}

#pragma mark - Lazy UI

- (UIImageView *)bgImageView {
    if (!_bgImageView) {
        _bgImageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"login_bg_icon"]];
        _bgImageView.contentMode = UIViewContentModeScaleAspectFill;
        _bgImageView.clipsToBounds = YES;
    }
    return _bgImageView;
}

- (UIImageView *)topRightImageView {
    if (!_topRightImageView) {
        _topRightImageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"login_jianp_icon"]];
        _topRightImageView.contentMode = UIViewContentModeScaleAspectFit;
        _topRightImageView.clipsToBounds = YES;
    }
    return _topRightImageView;
}

- (UIView *)contentContainerView {
    if (!_contentContainerView) {
        _contentContainerView = [UIView new];
        _contentContainerView.backgroundColor = [UIColor whiteColor];
    }
    return _contentContainerView;
}

- (UIButton *)backButton {
    if (!_backButton) {
        _backButton = [UIButton buttonWithType:UIButtonTypeCustom];
        UIImage *img = [UIImage imageNamed:@"back"];
        if (!img) { img = [UIImage imageNamed:@"back_black_icon"]; }
        if (img) {
            [_backButton setImage:img forState:UIControlStateNormal];
        }
        _backButton.adjustsImageWhenHighlighted = YES;
        _backButton.contentHorizontalAlignment = UIControlContentHorizontalAlignmentLeft;
        [_backButton addTarget:self action:@selector(onTapBack) forControlEvents:UIControlEventTouchUpInside];
    }
    return _backButton;
}

- (UILabel *)titleLabel {
    if (!_titleLabel) {
        _titleLabel = [UILabel new];
        _titleLabel.text = KBLocalized(@"Log In To Key Of Love");
        _titleLabel.textColor = [UIColor colorWithHex:KBBlackValue];
        _titleLabel.font = [KBFont bold:18];
        _titleLabel.textAlignment = NSTextAlignmentCenter;
    }
    return _titleLabel;
}

- (UIControl *)appleLoginButton {
    if (!_appleLoginButton) {
        ASAuthorizationAppleIDButton *btn = [ASAuthorizationAppleIDButton buttonWithType:ASAuthorizationAppleIDButtonTypeSignIn
                                                                                   style:ASAuthorizationAppleIDButtonStyleWhite];
        [btn addTarget:self action:@selector(onTapAppleLogin) forControlEvents:UIControlEventTouchUpInside];
        btn.cornerRadius = 10.0;
        btn.layer.borderColor = [UIColor colorWithHex:0xE5E5E5].CGColor;
        btn.layer.borderWidth = 1;
        btn.layer.cornerRadius = 10.0;
        btn.layer.masksToBounds = true;
        _appleLoginButton = btn;
    }
    return _appleLoginButton;
}

- (UIButton *)emailLoginButton {
    if (!_emailLoginButton) {
        _emailLoginButton = [UIButton buttonWithType:UIButtonTypeCustom];
        [_emailLoginButton setTitle:KBLocalized(@"Continue Via Email") forState:UIControlStateNormal];
        [_emailLoginButton setTitleColor:[UIColor colorWithHex:KBBlackValue] forState:UIControlStateNormal];
        _emailLoginButton.titleLabel.font = [KBFont medium:19];
//        _emailLoginButton.backgroundColor = [UIColor colorWithHex:0xF7F7F7];
        _emailLoginButton.layer.cornerRadius = 10.0;
        _emailLoginButton.layer.masksToBounds = YES;
        _emailLoginButton.layer.borderColor = [UIColor colorWithHex:0xE5E5E5].CGColor;
        _emailLoginButton.layer.borderWidth = 1;
        _emailLoginButton.imageEdgeInsets = UIEdgeInsetsMake(0, 0, 0, 0);
        _emailLoginButton.titleEdgeInsets = UIEdgeInsetsMake(0, 15, 0, 0);

        UIImage *icon = [UIImage imageNamed:@"login_email_icon"];
        if (icon) {
            // 将邮箱图标缩小一点，让视觉上更接近系统 Apple 按钮的图标大小
            CGFloat targetHeight = 12; // 设计上略小于按钮高度
            CGFloat scale = targetHeight / icon.size.height;
            CGSize targetSize = CGSizeMake(icon.size.width * scale, targetHeight);
            
            UIGraphicsBeginImageContextWithOptions(targetSize, NO, 0.0);
            [icon drawInRect:CGRectMake(0, 0, targetSize.width, targetSize.height)];
            UIImage *scaledIcon = UIGraphicsGetImageFromCurrentImageContext();
            UIGraphicsEndImageContext();
            
            [_emailLoginButton setImage:scaledIcon forState:UIControlStateNormal];
        }
        
        [_emailLoginButton addTarget:self action:@selector(onTapEmailLogin) forControlEvents:UIControlEventTouchUpInside];
    }
    return _emailLoginButton;
}

- (UITextView *)agreementTextView {
    if (!_agreementTextView) {
        _agreementTextView = [UITextView new];
        _agreementTextView.backgroundColor = [UIColor clearColor];
        _agreementTextView.editable = NO;          // 不可编辑
        _agreementTextView.selectable = NO;        // 不可选中文本
        _agreementTextView.scrollEnabled = NO;
        _agreementTextView.textAlignment = NSTextAlignmentCenter;
        _agreementTextView.textContainerInset = UIEdgeInsetsZero;
        _agreementTextView.textContainer.lineFragmentPadding = 0;

        // 协议文案：terms of service / privacy policy 为纯黑色并可点击，其余为 #717171
        NSString *fullText = @"By continuing, you agree to our terms of service and confirm that you have read our privacy policy";
        NSString *termsText = @"terms of service";
        NSString *privacyText = @"privacy policy";

        NSMutableParagraphStyle *paragraph = [[NSMutableParagraphStyle alloc] init];
        paragraph.alignment = NSTextAlignmentCenter; // 多行文本整体居中

        NSMutableAttributedString *attr = [[NSMutableAttributedString alloc] initWithString:fullText
                                                                                 attributes:@{
            NSFontAttributeName : [KBFont regular:10],
            NSForegroundColorAttributeName : [UIColor colorWithHex:0x717171],
            NSParagraphStyleAttributeName : paragraph
        }];

        NSString *lowerFull = fullText.lowercaseString;
        NSRange termsRange = [lowerFull rangeOfString:termsText.lowercaseString];
        if (termsRange.location != NSNotFound) {
            [attr addAttributes:@{
                NSForegroundColorAttributeName : [UIColor colorWithHex:KBBlackValue],
                NSUnderlineStyleAttributeName : @(NSUnderlineStyleNone)
            } range:termsRange];
        }

        NSRange privacyRange = [lowerFull rangeOfString:privacyText.lowercaseString];
        if (privacyRange.location != NSNotFound) {
            [attr addAttributes:@{
                NSForegroundColorAttributeName : [UIColor colorWithHex:KBBlackValue],
                NSUnderlineStyleAttributeName : @(NSUnderlineStyleNone)
            } range:privacyRange];
        }

        _agreementTextView.linkTextAttributes = @{
            NSForegroundColorAttributeName : [UIColor colorWithHex:KBBlackValue],
            NSUnderlineStyleAttributeName : @(NSUnderlineStyleNone)
        };
        _agreementTextView.attributedText = attr;

        // 自定义点击识别，避免系统选择/复制
        UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(kb_handleAgreementTap:)];
        _agreementTextView.userInteractionEnabled = YES;
        [_agreementTextView addGestureRecognizer:tap];
    }
    return _agreementTextView;
}

- (UILabel *)noAccountLabel {
    if (!_noAccountLabel) {
        _noAccountLabel = [UILabel new];
        _noAccountLabel.text = KBLocalized(@"Don't Have An Account?");
        _noAccountLabel.font = [KBFont regular:10];
        _noAccountLabel.textColor = [UIColor colorWithHex:KBBlackValue];
    }
    return _noAccountLabel;
}

- (UIButton *)signUpButton {
    if (!_signUpButton) {
        _signUpButton = [UIButton buttonWithType:UIButtonTypeCustom];
        [_signUpButton setTitle:KBLocalized(@"Sign Up") forState:UIControlStateNormal];
        [_signUpButton setTitleColor:[UIColor colorWithHex:KBColorValue] forState:UIControlStateNormal];
        _signUpButton.titleLabel.font = [KBFont medium:10];
        [_signUpButton addTarget:self action:@selector(onTapSignUp) forControlEvents:UIControlEventTouchUpInside];
    }
    return _signUpButton;
}

- (UIButton *)forgotPasswordButton {
    if (!_forgotPasswordButton) {
        _forgotPasswordButton = [UIButton buttonWithType:UIButtonTypeCustom];
        [_forgotPasswordButton setTitle:KBLocalized(@"Forgot Password?") forState:UIControlStateNormal];
        [_forgotPasswordButton setTitleColor:[UIColor colorWithHex:KBColorValue] forState:UIControlStateNormal];
        _forgotPasswordButton.titleLabel.font = [KBFont regular:10];
        [_forgotPasswordButton addTarget:self action:@selector(onTapForgotPassword) forControlEvents:UIControlEventTouchUpInside];
    }
    return _forgotPasswordButton;
}

#pragma mark - Helper

/// 让按钮内部图片和文字整体居中，并设置固定间距（spacing 为设计稿值，调用时已做 KBFit）
- (void)kb_centerImageAndTitleForButton:(UIButton *)button spacing:(CGFloat)spacing {
    if (!button.currentImage || button.currentTitle.length == 0) { return; }

    button.contentHorizontalAlignment = UIControlContentHorizontalAlignmentCenter;

    CGSize imageSize = button.imageView.image.size;
    CGSize titleSize = button.titleLabel.intrinsicContentSize;
    CGFloat totalWidth = imageSize.width + spacing + titleSize.width;

    CGFloat imageOffsetX = -(totalWidth / 2.0 - imageSize.width / 2.0);
    CGFloat titleOffsetX = totalWidth / 2.0 - titleSize.width / 2.0;

    button.imageEdgeInsets = UIEdgeInsetsMake(0, imageOffsetX, 0, -imageOffsetX);
    button.titleEdgeInsets = UIEdgeInsetsMake(0, titleOffsetX, 0, -titleOffsetX);
}

#pragma mark - Agreement Tap

- (void)kb_handleAgreementTap:(UITapGestureRecognizer *)tap {
    UITextView *textView = self.agreementTextView;
    CGPoint point = [tap locationInView:textView];

    // 将点击点转换到 textContainer 坐标系
    CGPoint location = point;
    location.x -= textView.textContainerInset.left;
    location.y -= textView.textContainerInset.top;

    NSLayoutManager *layoutManager = textView.layoutManager;
    NSTextContainer *textContainer = textView.textContainer;
    NSUInteger glyphIndex = [layoutManager glyphIndexForPoint:location
                                              inTextContainer:textContainer];
    if (glyphIndex >= textView.textStorage.length) { return; }

    NSUInteger charIndex = [layoutManager characterIndexForGlyphAtIndex:glyphIndex];

    NSString *lowerFull = textView.text.lowercaseString ?: @"";
    NSRange termsRange = [lowerFull rangeOfString:@"terms of service"];
    NSRange privacyRange = [lowerFull rangeOfString:@"privacy policy"];

    BOOL hitTerms = (termsRange.location != NSNotFound && NSLocationInRange(charIndex, termsRange));
    BOOL hitPrivacy = (privacyRange.location != NSNotFound && NSLocationInRange(charIndex, privacyRange));
    if (hitTerms || hitPrivacy) {
        [self onTapPolicy];
    }
}

@end