package com.duesk;

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import com.duesk.api.ApiClient;
import com.duesk.api.SessionManager;
import com.duesk.api.models.LoginResponse;

public class LoginDialog extends JDialog {
    private JTextField usernameField;
    private JPasswordField passwordField;
    private JButton loginButton;
    private JButton cancelButton;
    
    public LoginDialog() {
        setTitle("DÜSK - Anmeldung");
        setModal(true);
        setSize(400, 250);
        setLocationRelativeTo(null);
        setDefaultCloseOperation(DISPOSE_ON_CLOSE);
        
        initComponents();
    }
    
    private void initComponents() {
        setLayout(new GridBagLayout());
        GridBagConstraints gbc = new GridBagConstraints();
        gbc.insets = new Insets(5, 5, 5, 5);
        
        // Titel
        JLabel titleLabel = new JLabel("DÜSK - Düsseldorfer Schülerinventar");
        titleLabel.setFont(new Font("Arial", Font.BOLD, 16));
        gbc.gridx = 0;
        gbc.gridy = 0;
        gbc.gridwidth = 2;
        add(titleLabel, gbc);
        
        // Benutzername
        gbc.gridwidth = 1;
        gbc.gridy = 1;
        gbc.gridx = 0;
        add(new JLabel("Benutzername:"), gbc);
        
        usernameField = new JTextField("gast", 15);
        gbc.gridx = 1;
        add(usernameField, gbc);
        
        // Passwort
        gbc.gridy = 2;
        gbc.gridx = 0;
        add(new JLabel("Passwort:"), gbc);
        
        passwordField = new JPasswordField("gast", 15);
        gbc.gridx = 1;
        add(passwordField, gbc);
        
        // Buttons
        JPanel buttonPanel = new JPanel(new FlowLayout());
        loginButton = new JButton("Anmelden");
        cancelButton = new JButton("Abbrechen");
        
        loginButton.addActionListener(e -> doLogin());
        cancelButton.addActionListener(e -> System.exit(0));
        
        buttonPanel.add(loginButton);
        buttonPanel.add(cancelButton);
        
        gbc.gridy = 3;
        gbc.gridx = 0;
        gbc.gridwidth = 2;
        add(buttonPanel, gbc);
        
        // Info
        JLabel infoLabel = new JLabel("Server: paul-koop.org | Benutzung mit gast/gast möglich");
        infoLabel.setFont(new Font("Arial", Font.PLAIN, 10));
        infoLabel.setForeground(Color.GRAY);
        gbc.gridy = 4;
        add(infoLabel, gbc);
    }
    
    private void doLogin() {
        String username = usernameField.getText().trim();
        String password = new String(passwordField.getPassword()).trim();
        
        if (username.isEmpty() || password.isEmpty()) {
            JOptionPane.showMessageDialog(this, "Bitte Benutzername und Passwort eingeben!");
            return;
        }
        
        loginButton.setEnabled(false);
        
        SwingWorker<LoginResponse, Void> worker = new SwingWorker<LoginResponse, Void>() {
            @Override
            protected LoginResponse doInBackground() throws Exception {
                return ApiClient.login(username, password);
            }
            
            @Override
            protected void done() {
                try {
                    LoginResponse response = get();
                    if (response.isSuccess() || response.getUserId() != null) {
                        SessionManager.getInstance().setSession(response.getUserId(), response.getSession());
                        openMainFrame();
                        dispose();
                    } else {
                        JOptionPane.showMessageDialog(LoginDialog.this, 
                            "Anmeldung fehlgeschlagen: " + response.getError());
                    }
                } catch (Exception e) {
                    JOptionPane.showMessageDialog(LoginDialog.this, 
                        "Verbindungsfehler: " + e.getMessage());
                } finally {
                    loginButton.setEnabled(true);
                }
            }
        };
        worker.execute();
    }
    
    private void openMainFrame() {
        SwingUtilities.invokeLater(() -> {
            new MainFrame().setVisible(true);
        });
    }
}