package com.jesseweiman.RPChat.gui;

import com.jesseweiman.RPChat.Message;
import com.jesseweiman.RPChat.Properties;
import com.jesseweiman.RPChat.Utils;
import com.jesseweiman.RPChat.chat.ChatManager;
import com.jesseweiman.RPChat.manager.ConfigManager;

import javax.swing.*;
import javax.swing.text.BadLocationException;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

/**
 * Created with IntelliJ IDEA.
 * User: Jesse
 * Date: 10/2/12
 * Time: 1:04 AM
 * To change this template use File | Settings | File Templates.
 */
public class GUI extends JFrame implements ActionListener {

    ConfigManager configManager = new ConfigManager();
    ChatManager chatManager = new ChatManager(this, configManager);

    GridBagLayout chatLayout = new GridBagLayout();
    JPanel chatPanel = new JPanel(chatLayout);

    JTextPane statusPane = new JTextPane();
    JScrollPane statusView = new JScrollPane(statusPane);
    JTextPane recentChat = new JTextPane();
    JScrollPane chatView = new JScrollPane(recentChat);
    JSplitPane splitPane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT, chatPanel, statusView);

    JTextField inputField = new JTextField();
    JButton sendButton = new JButton("Send");

    JMenuBar menuBar = new JMenuBar();
    JMenu logMenu = new JMenu("Logs");
    JMenu homeMenu = new JMenu("RPChat");
    JMenuItem setNameItem = new JMenuItem("Set Name");
    JMenuItem quitItem = new JMenuItem("Quit");
    JMenu networkMenu = new JMenu("Network");
    JMenuItem setPortItem = new JMenuItem("Set Listening Port");
    JMenuItem setAddrItem = new JMenuItem("Set Buddy's Address");


    public GUI(){
        setupMenu();
        setupChatPanel();
        setupStatusPanel();
        setupSplitPane();
        setupListeners();

        setSize(600, 400);
        setJMenuBar(menuBar);

        add(splitPane);

        setVisible(true);
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    }

    private void sendMessage(){
        String message = inputField.getText().trim();

        if(!message.isEmpty()){
            chatManager.sendMessage(message);
            updateChat();
        }

        inputField.setText("");
        inputField.requestFocusInWindow();
    }

    public synchronized void updateChat(){
        final JScrollBar scrollBar = chatView.getVerticalScrollBar();
        boolean scrollBarVisible = scrollBar.isVisible();
        boolean scrollBottom = false;
        final int scrollValue = scrollBar.getValue();

        if(scrollBarVisible){
            scrollBottom = scrollBar.getMaximum() == scrollBar.getValue() + scrollBar.getVisibleAmount();
        }

        appendText();

//        if(!scrollBarVisible && scrollBar.isVisible() || scrollBottom) {
//            scrollToBottom();
//        }

        if( scrollBottom )
        {
            // force the slider to the bottom
            EventQueue.invokeLater(new Runnable()
            {
                @Override
                public void run()
                {
                    scrollBar.setValue(scrollBar.getMaximum());
                }
            });
        }
        else
        {
            // keep the slider where it is
            EventQueue.invokeLater(new Runnable()
            {
                @Override
                public void run()
                {
                    scrollBar.setValue(scrollValue);
                }
            });
        }
    }

    private void appendText(){
        Message[] messages = chatManager.getMessages();
        try{
            recentChat.getDocument().insertString(recentChat.getDocument().getLength(), Utils.buildMessageString(messages[messages.length - 1]) + "\n", null);
        }
        catch(BadLocationException e){
            //this will never happen
            e.printStackTrace();
        }
    }

    private void scrollToBottom()
    {
        Rectangle visible = recentChat.getVisibleRect();
        Rectangle bounds = recentChat.getBounds();
        // You need to add some kind of offset to scroll it to
        // the end; I put 50, but even some smaller values will do
        visible.y = bounds.height - visible.height + 50;

        recentChat.scrollRectToVisible(visible);
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        JComponent component = (JComponent)e.getSource();

        if(component instanceof JMenuItem){
            if(component == quitItem)
                System.exit(0);
            else if(component == setNameItem){
                InputDialog nameDialogue = new InputDialog(this, configManager, "Name", "Please enter your name", configManager.getString(Properties.NAME_KEY, ChatManager.DEFAULT_NAME));
                nameDialogue.display();
                if(nameDialogue.clickedOK() && !nameDialogue.getInput().trim().isEmpty()){
                    configManager.setProperty(Properties.NAME_KEY, nameDialogue.getInput());
                }
            }
            else if(component == setAddrItem){
                InputDialog nameDialogue = new InputDialog(this, configManager, "Name", "Please enter your name", configManager.getString(Properties.ADDRESS_KEY, "localhost"));
                nameDialogue.display();
                if(nameDialogue.clickedOK() && !nameDialogue.getInput().trim().isEmpty()){
                    configManager.setProperty(Properties.ADDRESS_KEY, nameDialogue.getInput());
                }
            }

        }
        else if(component == sendButton || component == inputField)
            sendMessage();
    }


    /*****************************************
     *     BORING BOILER PLATE CODE
     ******************************************/

    private void setupListeners() {
        sendButton.addActionListener(this);
        inputField.addActionListener(this);
    }

    private void setupStatusPanel() {
        statusPane.setEditable(false);
    }

    private void setupSplitPane() {
        splitPane.setResizeWeight(0.75);
    }

    private void setupMenu(){
        homeMenu.add(setNameItem);
        homeMenu.add(quitItem);

        networkMenu.add(setPortItem);
        networkMenu.add(setAddrItem);

        menuBar.add(homeMenu);
        menuBar.add(logMenu);
        menuBar.add(networkMenu);

        setNameItem.addActionListener(this);
        quitItem.addActionListener(this);
        setPortItem.addActionListener(this);
        setAddrItem.addActionListener(this);
    }

    private void setupChatPanel(){
        chatPanel.setBackground(Color.BLUE);

        GridBagConstraints c = new GridBagConstraints();
        c.fill = GridBagConstraints.BOTH;

        c.gridx = 0;
        c.gridy = 0;
        c.gridwidth = 2;
        c.weightx = 1.0;
        c.weighty = 1.0;
        recentChat.setMinimumSize(new Dimension(75, 100));
        recentChat.setEditable(false);
        chatLayout.setConstraints(chatView, c);
        chatPanel.add(chatView);

        c.gridwidth = 1;

        c.gridx = 0;
        c.gridy = 1;
        c.weightx = 1.0;
        c.weighty = 0.0;
        inputField.setMinimumSize(new Dimension(0, 25));
        chatLayout.setConstraints(inputField, c);
        chatPanel.add(inputField);

        c.gridx = 1;
        c.weightx = 0;
        chatLayout.setConstraints(sendButton, c);
        chatPanel.add(sendButton);
    }
}