package istlab.KisoJikken;

import java.awt.Desktop;
import java.awt.BorderLayout;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.event.MouseEvent;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;
import java.nio.channels.Channels;
import java.nio.channels.FileChannel;
import java.nio.channels.ReadableByteChannel;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.security.CodeSource;
import java.security.ProtectionDomain;
import java.util.Arrays;
import java.util.Hashtable;

import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JOptionPane;
import javax.swing.JScrollPane;
import javax.swing.JTree;
import javax.swing.event.MouseInputListener;
import javax.swing.event.TreeModelListener;
import javax.swing.tree.TreeModel;
import javax.swing.tree.TreePath;

public class Launcher extends JFrame implements MouseInputListener, KeyListener {

    public static Launcher theapp;
    public static String version = "0.4";
    public static String downloadurl = "https://cit.istlab.info/KisoJikkenNWP/target/";
    public static Path execPath;
    // JPanel mainP;
    JTree tree;
    Hashtable<File, Editor> file2editor;

    public Launcher(String[] args) {
        super("Kiso NWP Launcher v" + version);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        // mainP = new JPanel();
        file2editor = new Hashtable<File, Editor>();
        theapp = this;
        try {
            execPath = getApplicationPath(this.getClass());
        } catch (URISyntaxException e) {
            e.printStackTrace();
        }

        File root;
        if (args.length > 0)
            root = new File(args[0]);
        else
            root = new File(App.userhome + App.nwpsrc);

        // Create a TreeModel object to represent our tree of files
        FileTreeModel model = new FileTreeModel(root);

        // Create a JTree and tell it to display our model
        tree = new JTree();
        tree.setModel(model);
        tree.addMouseListener(this);
        tree.addKeyListener(this);

        // The JTree can get big, so allow it to scroll.
        JScrollPane scrollpane = new JScrollPane(tree);
        // mainP.setLayout(new BoxLayout(mainP, BoxLayout.PAGE_AXIS));
        // for (int i = 1; i < 8; i++) {
        // JButton b = new JButton("j" + i);
        // mainP.add(b);
        // }
        // ShellScriptPanel run11 = new ShellScriptPanel("run1-1.sh");
        getContentPane().add(scrollpane, BorderLayout.CENTER);

        // Menu
        JMenuBar menuBar = new JMenuBar();
        JMenu menu = new JMenu("App");
        JMenuItem mi = new JMenuItem("show version");
        mi.addActionListener(ae -> JOptionPane.showMessageDialog(this, "Kiso NWP Launcher v" + version));
        menu.add(mi);

        mi = new JMenuItem("download latest");
        mi.addActionListener(ae -> downloadLatest());
        menu.add(mi);

        mi = new JMenuItem("open download site");
        mi.addActionListener(ae -> openURL(downloadurl));
        menu.add(mi);

        mi = new JMenuItem("open JAR folder");
        mi.addActionListener(ae -> openExecPath());
        menu.add(mi);

        menuBar.add(menu);
        setJMenuBar(menuBar);

        // getContentPane().add(mainP, BorderLayout.WEST);
        setSize(400, 600);
    }

    public void downloadLatest() {
        // 最初に、ダウンロードサイトから最新版の情報を得る
        // 更新があれば、ダウンロードし、ファイルを表示する。
        StringBuilder sb = new StringBuilder();
        String latestVersion=null;
        try {
            URL url = new URL(downloadurl);
            InputStream is = url.openConnection().getInputStream();
            BufferedReader reader = new BufferedReader(new InputStreamReader(is));
            String line = null;
            while ((line = reader.readLine()) != null) {
                if (latestVersion==null) latestVersion = line.trim();
                System.out.println(line);
                sb.append(line+"\n");
            }
            reader.close();
        } catch (Exception ex) {
        }
        // System.out.println(sb.toString());
//同じかどうかチェック
        System.out.println("["+latestVersion+"]");
        System.out.println("="+execPath.getFileName()+"=");

        if (latestVersion.equals(execPath.getFileName().toString())){
            JOptionPane.showMessageDialog(this, "This is latest version : v"+version);
        } else {
            int res = JOptionPane.showConfirmDialog(this, "Download "+latestVersion+"??");
            if (res==JOptionPane.YES_OPTION){
                try {
                    URL url = new URL(downloadurl+"/"+latestVersion);
                    ReadableByteChannel readableByteChannel = Channels.newChannel(url.openStream());
                    FileOutputStream fileOutputStream = new FileOutputStream(latestVersion);
                    FileChannel fileChannel = fileOutputStream.getChannel();
                    fileOutputStream.getChannel().transferFrom(readableByteChannel, 0, Long.MAX_VALUE);
                    fileChannel.close();
                    fileOutputStream.close();
                } catch (Exception ex) {
                } finally {
                }
                openExecPath();
            }
        }

    }

    public void openExecPath() {
        File execFolder = execPath.getParent().toFile();
        openFolder(execFolder);
    }

    public void openFolder(File path) {
        try {
            Desktop.getDesktop().open(path);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public void openURL(String url) {
        if (Desktop.isDesktopSupported() && Desktop.getDesktop().isSupported(Desktop.Action.BROWSE)) {
            try {
                Desktop.getDesktop().browse(new URI(url));
            } catch (IOException | URISyntaxException e) {
                e.printStackTrace();
            }
        }
    }

    public static Path getApplicationPath(Class<?> cls) throws URISyntaxException {
        ProtectionDomain pd = cls.getProtectionDomain();
        CodeSource cs = pd.getCodeSource();
        URL location = cs.getLocation();
        URI uri = location.toURI();
        Path path = Paths.get(uri);
        return path;
    }

    @Override
    public void mouseClicked(MouseEvent e) {
        if (e.getClickCount() == 2) {
            openEditor();
        }
    }

    private void openEditor() {
        TreePath tp = tree.getSelectionModel().getSelectionPath();
        if (tp == null)
            return;
        File node = (File) tp.getLastPathComponent();
        Editor ed = file2editor.get(node);
        if (ed == null) {
            ed = new Editor(node);
            file2editor.put(node, ed);
        } else {
            ed.setVisible(true);
            ed.toFront();
        }
        System.out.println(node.toString());
    }

    @Override
    public void mousePressed(MouseEvent e) {
        // TODO Auto-generated method stub

    }

    @Override
    public void mouseReleased(MouseEvent e) {
        // TODO Auto-generated method stub

    }

    @Override
    public void mouseEntered(MouseEvent e) {
        // TODO Auto-generated method stub

    }

    @Override
    public void mouseExited(MouseEvent e) {
        // TODO Auto-generated method stub

    }

    @Override
    public void mouseDragged(MouseEvent e) {
        // TODO Auto-generated method stub

    }

    @Override
    public void mouseMoved(MouseEvent e) {
        // TODO Auto-generated method stub

    }

    @Override
    public void keyTyped(KeyEvent e) {
        // TODO Auto-generated method stub

    }

    @Override
    public void keyPressed(KeyEvent e) {
        if (e.getKeyCode() == 32) {
            openEditor();

        }
        // TODO Auto-generated method stub

    }

    @Override
    public void keyReleased(KeyEvent e) {
        // TODO Auto-generated method stub

    }

}

/**
 * The methods in this class allow the JTree component to traverse
 * the file system tree, and display the files and directories.
 **/
class FileTreeModel implements TreeModel {

    // We specify the root directory when we create the model.
    protected File root;

    public FileTreeModel(File root) {
        this.root = root;
    }

    // The model knows how to return the root object of the tree
    public Object getRoot() {
        return root;
    }

    // Tell JTree whether an object in the tree is a leaf or not
    public boolean isLeaf(Object node) {
        return ((File) node).isFile();
    }

    // Tell JTree how many children a node has
    public int getChildCount(Object parent) {
        String[] children = ((File) parent).list();
        if (children == null)
            return 0;
        return children.length;
    }

    // Fetch any numbered child of a node for the JTree.
    // Our model returns File objects for all nodes in the tree. The
    // JTree displays these by calling the File.toString() method.
    public Object getChild(Object parent, int index) {
        String[] children = ((File) parent).list();
        Arrays.sort(children);
        if ((children == null) || (index >= children.length))
            return null;
        return new File((File) parent, children[index]);
    }

    // Figure out a child's position in its parent node.
    public int getIndexOfChild(Object parent, Object child) {
        String[] children = ((File) parent).list();
        Arrays.sort(children);
        if (children == null)
            return -1;
        String childname = ((File) child).getName();
        // if (childname.startsWith(".")) return -1;
        for (int i = 0; i < children.length; i++) {
            if (childname.equals(children[i]))
                return i;
        }
        return -1;
    }

    // This method is only invoked by the JTree for editable trees.
    // This TreeModel does not allow editing, so we do not implement
    // this method. The JTree editable property is false by default.
    public void valueForPathChanged(TreePath path, Object newvalue) {
    }

    // Since this is not an editable tree model, we never fire any events,
    // so we don't actually have to keep track of interested listeners.
    public void addTreeModelListener(TreeModelListener l) {
    }

    public void removeTreeModelListener(TreeModelListener l) {
    }
}