//
//  AVLoginViewController.m
//  AVDemo
//

#import "AVLoginViewController.h"
#import "AVUserManager.h"
#import <Masonry/Masonry.h>

@interface AVLoginViewController () <UITextFieldDelegate>
@property (nonatomic, strong) UIImageView *logoImageView;
@property (nonatomic, strong) UILabel *titleLabel;
@property (nonatomic, strong) UIView *usernameContainer;
@property (nonatomic, strong) UITextField *usernameTextField;
@property (nonatomic, strong) UIView *passwordContainer;
@property (nonatomic, strong) UITextField *passwordTextField;
@property (nonatomic, strong) UIButton *passwordToggleButton;
@property (nonatomic, strong) UIButton *loginButton;
@end

@implementation AVLoginViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    self.view.backgroundColor = [UIColor systemBackgroundColor];
    
    [self setupUI];
    [self loadSavedUsername];
    
    // 添加点击手势，点击空白处收起键盘
    UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(dismissKeyboard)];
    [self.view addGestureRecognizer:tapGesture];
}

- (void)setupUI {
    // Logo 图标
    self.logoImageView = [[UIImageView alloc] initWithImage:[UIImage systemImageNamed:@"play.rectangle.on.rectangle.fill"]];
    self.logoImageView.tintColor = [UIColor systemBlueColor];
    self.logoImageView.contentMode = UIViewContentModeScaleAspectFit;
    [self.view addSubview:self.logoImageView];
    
    [self.logoImageView mas_makeConstraints:^(MASConstraintMaker *make) {
        make.centerX.equalTo(self.view);
        make.top.equalTo(self.view.mas_safeAreaLayoutGuideTop).offset(80);
        make.width.height.equalTo(@100);
    }];
    
    // 标题
    self.titleLabel = [[UILabel alloc] init];
    self.titleLabel.text = @"欢迎使用";
    self.titleLabel.font = [UIFont systemFontOfSize:28 weight:UIFontWeightBold];
    self.titleLabel.textAlignment = NSTextAlignmentCenter;
    [self.view addSubview:self.titleLabel];
    
    [self.titleLabel mas_makeConstraints:^(MASConstraintMaker *make) {
        make.centerX.equalTo(self.view);
        make.top.equalTo(self.logoImageView.mas_bottom).offset(24);
    }];
    
    // 用户名输入框容器
    self.usernameContainer = [[UIView alloc] init];
    self.usernameContainer.backgroundColor = [UIColor secondarySystemBackgroundColor];
    self.usernameContainer.layer.cornerRadius = 12;
    [self.view addSubview:self.usernameContainer];
    
    [self.usernameContainer mas_makeConstraints:^(MASConstraintMaker *make) {
        make.centerX.equalTo(self.view);
        make.top.equalTo(self.titleLabel.mas_bottom).offset(60);
        make.left.equalTo(self.view).offset(32);
        make.right.equalTo(self.view).offset(-32);
        make.height.equalTo(@50);
    }];
    
    // 用户名图标
    UIImageView *usernameIcon = [[UIImageView alloc] initWithImage:[UIImage systemImageNamed:@"person.fill"]];
    usernameIcon.tintColor = [UIColor systemGrayColor];
    usernameIcon.contentMode = UIViewContentModeScaleAspectFit;
    [self.usernameContainer addSubview:usernameIcon];
    
    [usernameIcon mas_makeConstraints:^(MASConstraintMaker *make) {
        make.left.equalTo(self.usernameContainer).offset(16);
        make.centerY.equalTo(self.usernameContainer);
        make.width.height.equalTo(@20);
    }];
    
    // 用户名输入框
    self.usernameTextField = [[UITextField alloc] init];
    self.usernameTextField.placeholder = @"请输入用户名";
    self.usernameTextField.font = [UIFont systemFontOfSize:16];
    self.usernameTextField.returnKeyType = UIReturnKeyNext;
    self.usernameTextField.autocapitalizationType = UITextAutocapitalizationTypeNone;
    self.usernameTextField.autocorrectionType = UITextAutocorrectionTypeNo;
    self.usernameTextField.delegate = self;
    [self.usernameContainer addSubview:self.usernameTextField];
    
    [self.usernameTextField mas_makeConstraints:^(MASConstraintMaker *make) {
        make.left.equalTo(usernameIcon.mas_right).offset(12);
        make.right.equalTo(self.usernameContainer).offset(-16);
        make.centerY.equalTo(self.usernameContainer);
    }];
    
    // 密码输入框容器
    self.passwordContainer = [[UIView alloc] init];
    self.passwordContainer.backgroundColor = [UIColor secondarySystemBackgroundColor];
    self.passwordContainer.layer.cornerRadius = 12;
    [self.view addSubview:self.passwordContainer];
    
    [self.passwordContainer mas_makeConstraints:^(MASConstraintMaker *make) {
        make.centerX.equalTo(self.view);
        make.top.equalTo(self.usernameContainer.mas_bottom).offset(16);
        make.left.equalTo(self.view).offset(32);
        make.right.equalTo(self.view).offset(-32);
        make.height.equalTo(@50);
    }];
    
    // 密码图标
    UIImageView *passwordIcon = [[UIImageView alloc] initWithImage:[UIImage systemImageNamed:@"lock.fill"]];
    passwordIcon.tintColor = [UIColor systemGrayColor];
    passwordIcon.contentMode = UIViewContentModeScaleAspectFit;
    [self.passwordContainer addSubview:passwordIcon];
    
    [passwordIcon mas_makeConstraints:^(MASConstraintMaker *make) {
        make.left.equalTo(self.passwordContainer).offset(16);
        make.centerY.equalTo(self.passwordContainer);
        make.width.height.equalTo(@20);
    }];
    
    // 密码输入框
    self.passwordTextField = [[UITextField alloc] init];
    self.passwordTextField.placeholder = @"请输入密码";
    self.passwordTextField.font = [UIFont systemFontOfSize:16];
    self.passwordTextField.secureTextEntry = YES;
    self.passwordTextField.returnKeyType = UIReturnKeyDone;
    self.passwordTextField.autocapitalizationType = UITextAutocapitalizationTypeNone;
    self.passwordTextField.autocorrectionType = UITextAutocorrectionTypeNo;
    self.passwordTextField.delegate = self;
    [self.passwordContainer addSubview:self.passwordTextField];
    
    // 密码显示/隐藏切换按钮
    self.passwordToggleButton = [UIButton buttonWithType:UIButtonTypeCustom];
    [self.passwordToggleButton setImage:[UIImage systemImageNamed:@"eye.slash.fill"] forState:UIControlStateNormal];
    [self.passwordToggleButton setImage:[UIImage systemImageNamed:@"eye.fill"] forState:UIControlStateSelected];
    self.passwordToggleButton.tintColor = [UIColor systemGrayColor];
    [self.passwordToggleButton addTarget:self action:@selector(togglePasswordVisibility) forControlEvents:UIControlEventTouchUpInside];
    [self.passwordContainer addSubview:self.passwordToggleButton];
    
    [self.passwordToggleButton mas_makeConstraints:^(MASConstraintMaker *make) {
        make.right.equalTo(self.passwordContainer).offset(-16);
        make.centerY.equalTo(self.passwordContainer);
        make.width.height.equalTo(@24);
    }];
    
    [self.passwordTextField mas_makeConstraints:^(MASConstraintMaker *make) {
        make.left.equalTo(passwordIcon.mas_right).offset(12);
        make.right.equalTo(self.passwordToggleButton.mas_left).offset(-12);
        make.centerY.equalTo(self.passwordContainer);
    }];
    
    // 登录按钮
    self.loginButton = [UIButton buttonWithType:UIButtonTypeSystem];
    [self.loginButton setTitle:@"登录" forState:UIControlStateNormal];
    self.loginButton.titleLabel.font = [UIFont systemFontOfSize:18 weight:UIFontWeightSemibold];
    self.loginButton.backgroundColor = [UIColor systemBlueColor];
    [self.loginButton setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
    self.loginButton.layer.cornerRadius = 12;
    [self.loginButton addTarget:self action:@selector(loginButtonTapped) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:self.loginButton];
    
    [self.loginButton mas_makeConstraints:^(MASConstraintMaker *make) {
        make.centerX.equalTo(self.view);
        make.top.equalTo(self.passwordContainer.mas_bottom).offset(32);
        make.left.equalTo(self.view).offset(32);
        make.right.equalTo(self.view).offset(-32);
        make.height.equalTo(@50);
    }];
}

- (void)loadSavedUsername {
    // 从 AVUserManager 获取上次登录的用户名
    NSString *savedUsername = [AVUserManager sharedManager].currentUsername;
    
    if (savedUsername.length > 0) {
        self.usernameTextField.text = savedUsername;
        NSLog(@"✅ 自动填充用户名: %@", savedUsername);
        
        // 如果有保存的用户名，自动聚焦到密码输入框
        [self.passwordTextField becomeFirstResponder];
    } else {
        // 如果没有保存的用户名，聚焦到用户名输入框
        [self.usernameTextField becomeFirstResponder];
    }
}

#pragma mark - Actions

- (void)loginButtonTapped {
    [self dismissKeyboard];
    
    NSString *username = self.usernameTextField.text;
    NSString *password = self.passwordTextField.text;
    
    // 验证输入
    if (username.length == 0) {
        [self showAlertWithMessage:@"请输入用户名"];
        return;
    }
    
    if (password.length == 0) {
        [self showAlertWithMessage:@"请输入密码"];
        return;
    }
    
    // 禁用登录按钮，防止重复提交
    self.loginButton.enabled = NO;
    [self.loginButton setTitle:@"登录中..." forState:UIControlStateNormal];
    self.loginButton.alpha = 0.6;
    
    // 执行登录（异步）
    __weak typeof(self) weakSelf = self;
    [[AVUserManager sharedManager] loginWithUsername:username password:password completion:^(BOOL success, NSString * _Nullable errorMessage) {
        __strong typeof(weakSelf) strongSelf = weakSelf;
        if (!strongSelf) return;
        
        // 恢复登录按钮状态
        strongSelf.loginButton.enabled = YES;
        [strongSelf.loginButton setTitle:@"登录" forState:UIControlStateNormal];
        strongSelf.loginButton.alpha = 1.0;
        
        if (success) {
            // 登录成功，通知代理
            NSLog(@"✅ 登录验证成功");
            if ([strongSelf.delegate respondsToSelector:@selector(loginViewControllerDidLogin:)]) {
                [strongSelf.delegate loginViewControllerDidLogin:strongSelf];
            }
        } else {
            // 登录失败，显示错误信息
            NSLog(@"❌ 登录验证失败: %@", errorMessage);
            [strongSelf showAlertWithMessage:errorMessage ?: @"登录失败，请重试"];
        }
    }];
}

- (void)dismissKeyboard {
    [self.view endEditing:YES];
}

- (void)togglePasswordVisibility {
    // 切换密码的可见性
    self.passwordTextField.secureTextEntry = !self.passwordTextField.secureTextEntry;
    
    // 切换按钮状态
    self.passwordToggleButton.selected = !self.passwordToggleButton.selected;
    
    // 保持光标位置（修复切换时光标跳到开头的问题）
    NSString *currentText = self.passwordTextField.text;
    self.passwordTextField.text = @"";
    self.passwordTextField.text = currentText;
}

- (void)showAlertWithMessage:(NSString *)message {
    UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"提示"
                                                                   message:message
                                                            preferredStyle:UIAlertControllerStyleAlert];
    [alert addAction:[UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:nil]];
    [self presentViewController:alert animated:YES completion:nil];
}

#pragma mark - UITextFieldDelegate

- (BOOL)textFieldShouldReturn:(UITextField *)textField {
    if (textField == self.usernameTextField) {
        // 用户名输入框按回车，跳到密码输入框
        [self.passwordTextField becomeFirstResponder];
    } else if (textField == self.passwordTextField) {
        // 密码输入框按回车，执行登录
        [self loginButtonTapped];
    }
    return YES;
}

#pragma mark - Orientation Support

- (BOOL)shouldAutorotate {
    return YES;
}

- (UIInterfaceOrientationMask)supportedInterfaceOrientations {
    return UIInterfaceOrientationMaskPortrait;
}

- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation {
    return UIInterfaceOrientationPortrait;
}

@end