package org.to.telegramfinalproject.UI;

import javafx.animation.PauseTransition;
import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.scene.Scene;
import javafx.scene.Parent;
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 org.to.telegramfinalproject.Models.User;
import org.to.telegramfinalproject.Security.PasswordHashing;

import java.io.IOException;

public class LoginController {

    @FXML private TextField usernameField;

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

    @FXML private Button togglePasswordBtn;
    @FXML private Label errorLabel;

    private ClientConnection connection;
    private boolean passwordVisible = false;

    @FXML
    public void initialize() {
        // Sync hidden and visible password fields
        visiblePasswordField.textProperty().bindBidirectional(passwordField.textProperty());

        try {
            connection = new ClientConnection("localhost", 12345);
        } 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 handleLogin() {
        String username = usernameField.getText();
        String password = passwordField.getText();

        // 1. Check for empty fields
        if (username.isEmpty() || password.isEmpty()) {
            showError("Please fill in all required fields.");
            return;
        }

        // 2. Check if username exists
        userDatabase userDb = new userDatabase();
        if (!userDb.existsByUsername(username)) {
            showError("This username doesn’t exist.");
            return;
        }

        // 3. Check if password is correct
        User user = userDb.findByUsername(username);
        if (!PasswordHashing.verify(password, user.getPassword())) {
            showError("Incorrect password.");
            return;
        }

        // 4. Attempt to send to server
        try {
            JSONObject request = new JSONObject();
            request.put("action", "login");
            request.put("user_id", JSONObject.NULL);
            request.put("username", username);
            request.put("password", password);
            request.put("profile_name", JSONObject.NULL);

            if (connection != null) {
                connection.send(request.toString());
                String responseStr = connection.receive();
                JSONObject response = new JSONObject(responseStr);
                System.out.println("Status: " + response.getString("status"));
                System.out.println("Message: " + response.getString("message"));

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

        } catch (Exception ex) {
            showError("Unable to connect to server. Please try again later.");
        }
    }

    @FXML
    private void switchToRegister() throws IOException {
        switchScene("register_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();
    }
}