package org.to.telegramfinalproject.UI;

import javafx.animation.PauseTransition;
import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.control.*;
import javafx.stage.Stage;
import javafx.util.Duration;
import org.json.JSONObject;
import org.to.telegramfinalproject.Client.ClientConnection;
import org.to.telegramfinalproject.Database.userDatabase;

import java.io.IOException;

public class RegisterController {

    @FXML private TextField userIdField;
    @FXML private TextField usernameField;
    @FXML private TextField profileNameField;

    @FXML private PasswordField passwordField;
    @FXML private TextField visiblePasswordField;

    @FXML private PasswordField confirmPasswordField;
    @FXML private TextField visibleConfirmPasswordField;

    @FXML private Button togglePasswordBtn;
    @FXML private Button toggleConfirmBtn;

    @FXML private Label errorLabel;

    private ClientConnection connection;

    private boolean passwordVisible = false;
    private boolean confirmVisible = false;

    @FXML
    public void initialize() {
        // Sync password and confirm fields with their visible counterparts
        visiblePasswordField.textProperty().bindBidirectional(passwordField.textProperty());
        visibleConfirmPasswordField.textProperty().bindBidirectional(confirmPasswordField.textProperty());

        try {
            connection = new ClientConnection("localhost", 8000);
        } catch (Exception e) {
            System.out.println("Could not connect to server: " + e.getMessage());
        }
    }

    @FXML
    private void togglePasswordVisibility() {
        passwordVisible = !passwordVisible;
        visiblePasswordField.setVisible(passwordVisible);
        visiblePasswordField.setManaged(passwordVisible);
        passwordField.setVisible(!passwordVisible);
        passwordField.setManaged(!passwordVisible);
        togglePasswordBtn.setText(passwordVisible ? "👁" : "👁");
    }

    @FXML
    private void toggleConfirmPasswordVisibility() {
        confirmVisible = !confirmVisible;
        visibleConfirmPasswordField.setVisible(confirmVisible);
        visibleConfirmPasswordField.setManaged(confirmVisible);
        confirmPasswordField.setVisible(!confirmVisible);
        confirmPasswordField.setManaged(!confirmVisible);
        toggleConfirmBtn.setText(confirmVisible ? "👁" : "👁");
    }

    @FXML
    private void handleRegister() {
        String userID = userIdField.getText().trim();
        String username = usernameField.getText().trim();
        String profileName = profileNameField.getText().trim();
        String password = passwordField.getText();
        String confirmPass = confirmPasswordField.getText();

        userDatabase userDb = new userDatabase();
        String passwordRegex = "\\b(?=[^\\s]*[A-Z])(?=[^\\s]*[a-z])(?=[^\\s]*\\d)(?=[^\\s]*[!@#$%^&*])[^\\s]{8,}\\b";

        // 1. Empty fields
        if (userID.isEmpty() || username.isEmpty() || profileName.isEmpty() || password.isEmpty() || confirmPass.isEmpty()) {
            showError("Please fill in all required fields.");
            return;
        }

        // 2. Username exists
        if (userDb.existsByUsername(username)) {
            showError("This username is already taken.");
            return;
        }

        // 3. User ID exists
        if (userDb.existsByUserId(userID)) {
            showError("This user ID is already taken.");
            return;
        }

        // 4. Password mismatch
        if (!password.equals(confirmPass)) {
            showError("Passwords do not match.");
            return;
        }

        // 5. Weak password
        if (!password.matches(passwordRegex)) {
            showError("Password must be at least 8 characters, include a capital letter, a number, and a special character.");
            return;
        }

        // 6. Attempt registration
        try {
            JSONObject request = new JSONObject();
            request.put("action", "register");
            request.put("user_id", userID);
            request.put("username", username);
            request.put("password", password);
            request.put("profile_name", profileName);
            connection.send(request.toString());

            // Simulate successful registration (since main.fxml isn’t ready)
            Alert alert = new Alert(Alert.AlertType.INFORMATION, "Registration successful!");
            alert.show();

        } catch (Exception ex) {
            showError("Failed to register. Please try again later.");
        }
    }

    @FXML
    private void switchToLogin() throws IOException {
        switchScene("login_view.fxml");
    }

    private void switchScene(String fxmlFile) {
        try {
            FXMLLoader loader = new FXMLLoader(getClass().getResource("/org/to/telegramfinalproject/" + fxmlFile));
            Parent root = loader.load();
            Stage stage = (Stage) usernameField.getScene().getWindow();
            stage.setScene(new Scene(root, 500, 700));
            stage.show();
        } catch (IOException e) {
            e.printStackTrace();
            showError("Could not load scene: " + fxmlFile);
        }
    }

    private void showError(String message) {
        errorLabel.setVisible(false);
        errorLabel.setText("");  // Clear the label text

        PauseTransition pause = new PauseTransition(Duration.millis(50));
        pause.setOnFinished(event -> {
            errorLabel.setText(message);
            errorLabel.setVisible(true);
        });
        pause.play();
    }
}