package com.wsf.mathapp.view;

import com.wsf.mathapp.controller.SceneManager;
import com.ybw.mathapp.util.EmailService;
import com.ybw.mathapp.util.Register;
import java.util.regex.Pattern;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.*;
import javafx.scene.layout.VBox;
import javafx.scene.text.Font;
import com.ybw.mathapp.util.LoginFileUtils;

public class RegisterView {
  private Scene scene;
  private final SceneManager sceneManager;

  public RegisterView(SceneManager sceneManager) {
    this.sceneManager = sceneManager;
    createScene();
  }

  private void createScene() {
    VBox root = new VBox(15);
    root.setPadding(new Insets(30));
    root.setAlignment(Pos.CENTER);

    Label titleLabel = new Label("用户注册");
    titleLabel.setFont(Font.font(20));

    // 添加用户名输入框
    TextField usernameField = new TextField();
    usernameField.setPromptText("请输入用户名(3-20位字母、数字、下划线)");
    usernameField.setMaxWidth(300);
    usernameField.setPrefHeight(35);

    TextField emailField = new TextField();
    emailField.setPromptText("请输入邮箱");
    emailField.setMaxWidth(300);
    emailField.setPrefHeight(35);

    Button sendCodeButton = new Button("发送验证码");
    sendCodeButton.setStyle("-fx-background-color: #FF9800; -fx-text-fill: white;");
    sendCodeButton.setPrefSize(120, 35);

    TextField codeField = new TextField();
    codeField.setPromptText("请输入验证码");
    codeField.setMaxWidth(300);
    codeField.setPrefHeight(35);

    PasswordField passwordField = new PasswordField();
    passwordField.setPromptText("请输入密码(6-10位，含大小写字母和数字)");
    passwordField.setMaxWidth(300);
    passwordField.setPrefHeight(35);

    PasswordField confirmPasswordField = new PasswordField();
    confirmPasswordField.setPromptText("请再次输入密码");
    confirmPasswordField.setMaxWidth(300);
    confirmPasswordField.setPrefHeight(35);

    Button registerButton = new Button("注册");
    registerButton.setStyle("-fx-background-color: #4CAF50; -fx-text-fill: white; -fx-font-size: 14px;");
    registerButton.setPrefSize(300, 40);

    Button backButton = new Button("返回登录");
    backButton.setStyle("-fx-background-color: #757575; -fx-text-fill: white;");
    backButton.setPrefSize(300, 35);

    Label statusLabel = new Label();

    sendCodeButton.setOnAction(e -> {
      String username = usernameField.getText().trim();
      String email = emailField.getText().trim();

      // 验证用户名
      if (!isValidUsername(username)) {
        showError(statusLabel, "用户名只包含英文字母和数字)");
        return;
      }

      // 检查用户名是否已存在
      if (LoginFileUtils.isNameRegistered(username)) {
        showError(statusLabel, "用户名已存在，请选择其他用户名！");
        return;
      }

      if (!EmailService.isValidEmail(email)) {
        showError(statusLabel, "请输入有效的邮箱地址！");
        return;
      }

      if (LoginFileUtils.isEmailRegistered(email)){
        showError(statusLabel, "该邮箱已注册，请直接登录！");
        return;
      }

      // 生成并发送验证码
      boolean sent = EmailService.sendCode(email);
      if (sent) {
        showSuccess(statusLabel, "验证码已发送到您的邮箱！");
        // 禁用发送按钮60秒
        sendCodeButton.setDisable(true);
        startCountdown(sendCodeButton);
      } else {
        showError(statusLabel, "发送验证码失败，请稍后重试！");
      }
    });

    registerButton.setOnAction(e -> {
      String username = usernameField.getText().trim();
      String email = emailField.getText().trim();
      String code = codeField.getText().trim();
      String password = passwordField.getText();
      String confirmPassword = confirmPasswordField.getText();

      // 验证用户名
      if (!isValidUsername(username)) {
        showError(statusLabel, "用户名只包含英文字母和数字");
        return;
      }

      // 检查用户名是否已存在
      if (LoginFileUtils.isNameRegistered((username))){
        showError(statusLabel, "用户名已存在，请选择其他用户名！");
        return;
      }

      if (!EmailService.isValidEmail(email)) {
        showError(statusLabel, "请输入有效的邮箱地址！");
        return;
      }

      if (LoginFileUtils.isEmailRegistered(email)){
        showError(statusLabel, "该邮箱已注册，请直接登录！");
        return;
      }

      if (username.isEmpty() || email.isEmpty() || code.isEmpty() || password.isEmpty()) {
        showError(statusLabel, "请填写所有字段！");
        return;
      }

      // 验证验证码
      if (!EmailService.verifyCode(email, code)) {
        showError(statusLabel, "验证码错误或已过期！");
        return;
      }

      if (!Register.isVaildPassword(password)) {
        showError(statusLabel, "密码要6-10位，包含大，小写字母和数字");
        return;
      }

      if (!Register.isEqualPassword(password,confirmPassword)){
        showError(statusLabel, "两次密码不一致");
        return;
      }

      if (Register.register(username, email, password)) {
        showSuccess(statusLabel, "注册成功！用户名: " + username);
        sceneManager.showLoginView();
      } else {
        showError(statusLabel, "注册失败，请检查信息！");
      }
    });

    backButton.setOnAction(e -> {
      sceneManager.showLoginView();
    });

    root.getChildren().addAll(
        titleLabel,
        usernameField,  // 添加用户名输入框
        emailField,
        sendCodeButton,
        codeField,
        passwordField,
        confirmPasswordField,
        registerButton,
        backButton,
        statusLabel
    );

    scene = new Scene(root, 400, 550); // 增加高度以适应新字段
  }

  private void startCountdown(Button button) {
    new Thread(() -> {
      try {
        for (int i = 60; i > 0; i--) {
          int finalI = i;
          javafx.application.Platform.runLater(() -> {
            button.setText(finalI + "秒后重发");
          });
          Thread.sleep(1000);
        }
        javafx.application.Platform.runLater(() -> {
          button.setText("发送验证码");
          button.setDisable(false);
        });
      } catch (InterruptedException ex) {
        ex.printStackTrace();
      }
    }).start();
  }

  private void showError(Label label, String message) {
    label.setText(message);
    label.setStyle("-fx-text-fill: red;");
  }

  private void showSuccess(Label label, String message) {
    label.setText(message);
    label.setStyle("-fx-text-fill: green;");
  }

  public Scene getScene() {
    return scene;
  }
  public static boolean isValidUsername(String username) {
    if (username == null || username.trim().isEmpty()) {
      return false;
    }
    // 用户名规则：只能包含英文字母和数字
    String usernameRegex = "^[a-zA-Z0-9]{3,100}$";
    return Pattern.matches(usernameRegex, username.trim());
  }
}