// src/com/minecraftlauncher/ui/InstalledVersionsDialog.java
package com.minecraftlauncher.ui;

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.List;

public class InstalledVersionsDialog extends JDialog {
    private static final String MINECRAFT_DIR = System.getProperty("user.home") + "/.minecraft";
    private JList<String> versionsList;
    private DefaultListModel<String> listModel;
    private JButton deleteButton;
    private JButton refreshButton;
    private JLabel sizeLabel;

    public InstalledVersionsDialog(JFrame parent) {
        super(parent, "Versions Installées", true);
        initializeComponents();
        setupLayout();
        setupEventListeners();
        loadInstalledVersions();
        
        setSize(500, 400);
        setLocationRelativeTo(parent);
        setResizable(true);
    }

    private void initializeComponents() {
        // Liste des versions
        listModel = new DefaultListModel<>();
        versionsList = new JList<>(listModel);
        versionsList.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
        versionsList.setFont(new Font("SansSerif", Font.PLAIN, 12));
        versionsList.setBackground(Color.WHITE);
        versionsList.setForeground(Color.BLACK);
        versionsList.setBorder(BorderFactory.createEmptyBorder(5, 10, 5, 10));
        
        // Boutons
        deleteButton = new JButton("Supprimer");
        deleteButton.setEnabled(false);
        styleButton(deleteButton, new Color(220, 38, 38), new Color(185, 28, 28)); // Rouge
        
        refreshButton = new JButton("Actualiser");
        styleButton(refreshButton, new Color(37, 99, 235), new Color(29, 78, 216)); // Bleu
        
        JButton closeButton = new JButton("Fermer");
        styleButton(closeButton, new Color(107, 114, 128), new Color(75, 85, 99)); // Gris
        
        // Label d'information
        sizeLabel = new JLabel("Aucune version installée");
        sizeLabel.setFont(new Font("SansSerif", Font.PLAIN, 11));
        sizeLabel.setForeground(new Color(107, 114, 128));
        
        // Événements des boutons
        closeButton.addActionListener(e -> dispose());
    }
    
    private void styleButton(JButton button, Color bgColor, Color hoverColor) {
        button.setBackground(bgColor);
        button.setForeground(Color.WHITE);
        button.setFocusPainted(false);
        button.setBorderPainted(false);
        button.setFont(new Font("SansSerif", Font.BOLD, 11));
        button.setCursor(new Cursor(Cursor.HAND_CURSOR));
        button.setBorder(BorderFactory.createEmptyBorder(8, 16, 8, 16));
        
        // Effet hover
        button.addMouseListener(new java.awt.event.MouseAdapter() {
            public void mouseEntered(java.awt.event.MouseEvent evt) {
                button.setBackground(hoverColor);
            }
            public void mouseExited(java.awt.event.MouseEvent evt) {
                button.setBackground(bgColor);
            }
        });
    }

    private void setupLayout() {
        setLayout(new BorderLayout(10, 10));
        
        // Panel principal
        JPanel mainPanel = new JPanel(new BorderLayout(10, 10));
        mainPanel.setBorder(BorderFactory.createEmptyBorder(20, 20, 20, 20));
        
        // Titre
        JLabel titleLabel = new JLabel("Versions de Minecraft Installées");
        titleLabel.setFont(new Font("SansSerif", Font.BOLD, 16));
        titleLabel.setHorizontalAlignment(SwingConstants.CENTER);
        titleLabel.setBorder(BorderFactory.createEmptyBorder(0, 0, 15, 0));
        
        // Liste avec scroll
        JScrollPane scrollPane = new JScrollPane(versionsList);
        scrollPane.setBorder(BorderFactory.createLineBorder(new Color(75, 85, 99), 1));
        scrollPane.setPreferredSize(new Dimension(400, 250));
        
        // Panel des boutons
        JPanel buttonPanel = new JPanel(new FlowLayout(FlowLayout.RIGHT, 10, 0));
        buttonPanel.add(deleteButton);
        buttonPanel.add(refreshButton);
        buttonPanel.add(new JButton("Fermer") {{ 
            styleButton(this, new Color(107, 114, 128), new Color(75, 85, 99));
            addActionListener(e -> dispose());
        }});
        
        // Panel du bas avec info et boutons
        JPanel bottomPanel = new JPanel(new BorderLayout());
        bottomPanel.add(sizeLabel, BorderLayout.WEST);
        bottomPanel.add(buttonPanel, BorderLayout.EAST);
        
        mainPanel.add(titleLabel, BorderLayout.NORTH);
        mainPanel.add(scrollPane, BorderLayout.CENTER);
        mainPanel.add(bottomPanel, BorderLayout.SOUTH);
        
        add(mainPanel);
    }

    private void setupEventListeners() {
        // Sélection dans la liste
        versionsList.addListSelectionListener(e -> {
            if (!e.getValueIsAdjusting()) {
                deleteButton.setEnabled(versionsList.getSelectedValue() != null);
            }
        });
        
        // Bouton supprimer
        deleteButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                deleteSelectedVersion();
            }
        });
        
        // Bouton actualiser
        refreshButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                loadInstalledVersions();
            }
        });
    }

    private void loadInstalledVersions() {
        listModel.clear();
        List<String> installedVersions = getInstalledVersions();
        
        if (installedVersions.isEmpty()) {
            sizeLabel.setText("Aucune version installée");
        } else {
            for (String version : installedVersions) {
                listModel.addElement(version);
            }
            
            // Calculer la taille totale
            long totalSize = calculateTotalSize(installedVersions);
            String sizeText = formatSize(totalSize);
            sizeLabel.setText(installedVersions.size() + " version(s) - " + sizeText);
        }
    }

    private List<String> getInstalledVersions() {
        List<String> versions = new ArrayList<>();
        Path versionsDir = Paths.get(MINECRAFT_DIR, "versions");
        
        try {
            if (Files.exists(versionsDir) && Files.isDirectory(versionsDir)) {
                Files.list(versionsDir)
                    .filter(Files::isDirectory)
                    .forEach(versionDir -> {
                        String versionName = versionDir.getFileName().toString();
                        Path jarFile = versionDir.resolve(versionName + ".jar");
                        Path jsonFile = versionDir.resolve(versionName + ".json");
                        
                        // Vérifier que les fichiers essentiels existent
                        if (Files.exists(jarFile) && Files.exists(jsonFile)) {
                            versions.add(versionName);
                        }
                    });
            }
        } catch (Exception e) {
            System.err.println("Erreur lors de la lecture des versions: " + e.getMessage());
        }
        
        versions.sort(String::compareTo);
        return versions;
    }
    
    private long calculateTotalSize(List<String> versions) {
        long totalSize = 0;
        for (String version : versions) {
            Path versionDir = Paths.get(MINECRAFT_DIR, "versions", version);
            try {
                totalSize += Files.walk(versionDir)
                    .filter(Files::isRegularFile)
                    .mapToLong(path -> {
                        try {
                            return Files.size(path);
                        } catch (Exception e) {
                            return 0;
                        }
                    })
                    .sum();
            } catch (Exception e) {
                // Ignorer les erreurs pour cette version
            }
        }
        return totalSize;
    }
    
    private String formatSize(long bytes) {
        if (bytes < 1024) return bytes + " B";
        if (bytes < 1024 * 1024) return String.format("%.1f KB", bytes / 1024.0);
        if (bytes < 1024 * 1024 * 1024) return String.format("%.1f MB", bytes / (1024.0 * 1024.0));
        return String.format("%.1f GB", bytes / (1024.0 * 1024.0 * 1024.0));
    }

    private void deleteSelectedVersion() {
        String selectedVersion = versionsList.getSelectedValue();
        if (selectedVersion == null) return;
        
        int result = JOptionPane.showConfirmDialog(
            this,
            "Voulez-vous vraiment supprimer la version " + selectedVersion + " ?\n\n" +
            "Cette action est irréversible.",
            "Confirmer la suppression",
            JOptionPane.YES_NO_OPTION,
            JOptionPane.WARNING_MESSAGE
        );
        
        if (result == JOptionPane.YES_OPTION) {
            if (deleteVersion(selectedVersion)) {
                JOptionPane.showMessageDialog(
                    this,
                    "Version " + selectedVersion + " Supprimée avec succès.",
                    "Suppression réussie",
                    JOptionPane.INFORMATION_MESSAGE
                );
                loadInstalledVersions(); // Actualiser la liste
            } else {
                JOptionPane.showMessageDialog(
                    this,
                    "Erreur lors de la suppression de la version " + selectedVersion + ".\n" +
                    "Vérifiez que les fichiers ne sont pas en cours d'utilisation.",
                    "Erreur de suppression",
                    JOptionPane.ERROR_MESSAGE
                );
            }
        }
    }
    
    private boolean deleteVersion(String version) {
        Path versionDir = Paths.get(MINECRAFT_DIR, "versions", version);
        
        try {
            // Supprimer récursivement le dossier de la version
            Files.walk(versionDir)
                .sorted((a, b) -> b.compareTo(a)) // Ordre inverse pour supprimer les fichiers avant les dossiers
                .forEach(path -> {
                    try {
                        Files.delete(path);
                    } catch (Exception e) {
                        System.err.println("Impossible de supprimer: " + path);
                    }
                });
            return !Files.exists(versionDir);
        } catch (Exception e) {
            System.err.println("[ERROR] Erreur lors de la suppression: " + e.getMessage());
            return false;
        }
    }
}