package com.coder.client;

import java.io.IOException;
import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;

import javax.swing.JOptionPane;

import com.coder.client.Session;
import com.coder.client.gui.editor.EditorWindow;
import com.coder.client.gui.editor.EditorWindowListener;
import com.coder.client.gui.login.LoginDialog;
import com.coder.client.gui.login.LoginDialogAction;
import com.coder.client.gui.project.SelectProjectDialog;
import com.coder.client.gui.project.SelectProjectDialogListener;
import com.coder.server.CoderServer;
import com.coder.server.message.CoderMessage;
import com.coder.server.message.ConfigData;
import com.coder.server.message.ProjectListData;
import com.coder.server.message.ProjectListReqMsg;
import com.coder.server.message.ProjectRspMsg;

import zutil.log.CompactLogFormatter;
import zutil.log.LogUtil;
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;

public class CoderClient extends Application{
	public static final Logger logger = LogUtil.getLogger();
	private int port = CoderServer.SERVER_PORT;
	private static final int DEFAULT_CONNECTION_RETRIES = 5;
	private Session session;
	private String url;
	private Stage mainStage;
	private String username = null;
	private char[] password = null;
	private int connectionRetriesLimit = DEFAULT_CONNECTION_RETRIES;	//if zero, try forever
	private EditorWindow editorWindow;
	private LoginDialog loginDialog;
	private SelectProjectDialog selectProjectDialog;
	
	public static void main(String[] args) {
        Application.launch(args);
    }

	@Override
	public void start(Stage mainStage) throws Exception {
		
		//setup logging
		LogUtil.setGlobalLevel(Level.INFO);
        LogUtil.setGlobalFormatter(new CompactLogFormatter());
		
		//parse program arguments
		Map<String, String> params = this.getParameters().getNamed();
		String username = null;
		char[] password = null;
		boolean reconnectForever = false;		
		for(String key : params.keySet()){
			String value = params.get(key);
			if(key.equals("username")){
				username = value;
			}else if(key.equals("password")){
				password = value.toCharArray();
			}else if(key.equals("retry-connect-forever")){
				reconnectForever = true;
			}
		}
		
		//create a client instance
		this.url = "127.0.0.1";
		if(username != null){
			this.username = username;
			if(password != null){
				this.password = password;
			}
		}
		if(reconnectForever){
			this.connectionRetriesLimit = 0;
		}
		
		//loading GUI
		this.mainStage = mainStage;
		mainStage.setTitle("CoderClient");
		this.editorWindow = new EditorWindow();
		this.loginDialog = new LoginDialog();
		this.selectProjectDialog = new SelectProjectDialog();
		
		//register listeners
		registerListeners();
		
		//start program logic
		run();
	}
	
	private void registerListeners() {
		
		this.selectProjectDialog.addSelectProjectDialogListener(new SelectProjectDialogListener() {
			@Override
			public void willShow() {
				//clear current list of project
				selectProjectDialog.clearProjectList();
				
				//send a request for a new list of projects
				CoderMessage msg = new CoderMessage();
				msg.ProjectListReq = new ProjectListReqMsg();
				try {
					session.send(msg);
				} catch (IOException e) {
					logger.log(Level.SEVERE, "Unable to send ProjectListReqMsg", e);
					closeCurrentSession();
				}
			}
			@Override
			public void openProject(String selectedProjectName) {
				selectProjectDialog.close();
				editorWindow.showOnStage(mainStage);
			}
			@Override
			public void newProject() {
				selectProjectDialog.close();
				//TODO
			}
			@Override
			public void cancel() {
				selectProjectDialog.close();
			}
		});
		
		this.editorWindow.addMessageSentListener(new EditorWindowListener() {
			
		});

	}

	private void closeCurrentSession(){
		if(this.session != null){
			session.close();
			session = null;
		}
	}

	public void run(){
		//keep track of the number of connection retries to the server
		int connectionRetries = 0;
		while(true){
			//close previous session if applicable
			closeCurrentSession();
			
			//setup a new session
			if(connectionRetries > 0){
				logger.fine("This is reconnection try number: " + connectionRetries);
			}
			logger.fine("Setting up a connected session");
			this.session = Session.setupConnection(url, port);
			if(session == null){
				logger.warning("Could not setup a connection to " + url + ":" + port);
				connectionRetries++;
				if(connectionRetriesLimit > 0 && connectionRetries > connectionRetriesLimit){
					//stop trying to connect
					logger.severe("Was not able to conenct to the remote host.");
					break;
				}else{
					//wait for awhile and try to connect one more
					logger.info("Will retry to connect once more in 2 seconds.");
					try {
						Thread.sleep(2000);
					} catch (InterruptedException e) {
						
					}
					continue;
				}
			}
			
			//get user credentials
			if(username != null && !username.isEmpty() && password != null && password.length > 0){
				//do nothing, already have all credentials we need
				logger.fine("All login credentials have already been given. No need for a login dialog.");
			}else{
				//ask for username and password in a dialog window
				logger.info("All or some login credentials have not been given. Using a dialog for input.");
				loginDialog.setUsername(username);
				loginDialog.showModal(this.mainStage);
				if(loginDialog.getAction() == LoginDialogAction.CANCEL){
					logger.fine("Login dialog closed or canceled by the user. terminating.");
					break;
				}
				username = loginDialog.getUsername();
				password = loginDialog.getPassword();
			}
			logger.fine("The username: \"" + username + "\" will be used as the credential holder");
			
			//authenticate the user
			boolean authenticated = session.authenticate(username, password);
			if(!authenticated){
				JOptionPane.showMessageDialog(null, "Wrong username or password", "Authentication Failed", JOptionPane.INFORMATION_MESSAGE);
				logger.severe("Authentication failed: wrong username or password");
				continue;
			}
			
			//resister a message listener to the session
			session.addCoderMessageReceivedListener(new CoderMessageReceivedListener() {
				@Override
				public void projectListRspReceived(Map<String, ProjectListData> projectListRsp) {
					for(String projectName : projectListRsp.keySet()){
						ProjectListData projectData = projectListRsp.get(projectName);
						selectProjectDialog.addProjectToList(projectName, projectData.type);
					}
				}
				@Override
				public void projectTypeRspReceived(Map<String, ConfigData> projectTypeRsp) {
					// TODO Auto-generated method stub
				}
				@Override
				public void projectRspReceived(ProjectRspMsg projectRspMsg) {
					// TODO Auto-generated method stub
				}
			});
			
			//start receiving traffic from the server
			session.start();
			
			//show the project selector dialog
			this.selectProjectDialog.showModal(mainStage);
			
			//wait here until the session is closed for some reason

			while(session.isConnected()){
				Thread.yield();
			}
			
			//hide the main GUI
			logger.fine("The socket was closed.");
			mainStage.close();
			Thread.yield();
		}
		logger.info("The program till now terminate");
		closeCurrentSession();
//		this.projectEditorWindow.dispose();
		System.exit(0);
	}

}