//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//PIMS: Personal Invstment Management System
//Class : Installation.
//This class is the PIMS installation program. In the installation the user is
//asked for the initial username and password. The user also needs to specify
//his home directory. The PIMS working files are then created in the directory
// home/.pims. After this process the next installation program is called which
//downloads the share prices from the net and initializes the prices file. The
//Companies file is also initialized which contains the names of some 800
//companies registered in the NSE stock exchange.
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

import java.awt.*;
import java.applet.*;
import java.awt.event.*;
import javax.swing.*;
import java.lang.*;
import java.io.*;
import java.util.*;

public class Installation extends JFrame implements ActionListener{

	private String login;
	private String password;

	private TextField log;
	private TextField pass;
	private TextField ret_pass;
	private TextField home;
	private Button cancel;
	private Button next;
	private String logt;
	private String passt;
	private String homet;
	private boolean downloadOption;

	public Installation(boolean downloadOption)throws Exception{

		login = "";
		password = "";
		this.downloadOption  = downloadOption;

		installPIMS();
	}

	private void installPIMS()throws Exception{
		setSize(420, 300);
		setLocation(320,280);
		setBackground(Color.white);
		setTitle("PIMS Installation Wizard");

		Container CP = getContentPane();
		CP.setBackground(Color.white);
		CP.setLayout(new FlowLayout());

		Panel pan1 = new Panel();
		Panel pan2 = new Panel();
		Panel pan3 = new Panel();
		Panel pan4 = new Panel();
		Panel pan5 = new Panel();
		Panel pan6 = new Panel();

		Label PIMS = new Label("PIMS: Personal Investment Management System");
		pan1.add(PIMS);

		Label login = new Label("Enter the desired login:");
		log = new TextField(15);
		pan2.add(login);pan2.add(log);

		Label password = new Label("Give initial password");
		pass = new TextField(15);
		pass.setEchoChar('*');
		pan3.add(password);pan3.add(pass);

		Label retype_password = new Label("Retype Password");
		ret_pass = new TextField(15);
		ret_pass.setEchoChar('*');
		pan4.add(retype_password);pan4.add(ret_pass);

		Label homel = new Label("Enter Home Directory(full path):");
		home = new TextField(20);
		pan5.add(homel);pan5.add(home);

		cancel = new Button("Cancel");
		cancel.addActionListener(this);
		next = new Button("Next");
		next.addActionListener(this);
		pan6.add(cancel);pan6.add(next);

		CP.add(pan1);
		CP.add(pan2);
		CP.add(pan3);
		CP.add(pan4);
		CP.add(pan5);
		CP.add(pan6);

		setVisible(true);
	}

	private boolean initializeFiles()throws Exception{

		Process P = java.lang.Runtime.getRuntime().exec("./removePrevious");
		P.waitFor();
		//Create the directory .pims in the home directory of the user.
		if(!(new File(homet+"/.pims")).mkdir())return(false);
		//Create the directory .pims/Investment which will contain the entrire Investment structure.
		if(!(new File(homet+"/.pims/Investment")).mkdir())return(false);
		if(!(new File(homet+"/.pims/Investment/portfolios")).createNewFile())return(false);
		//create the files neede for computation.
		if(!(new File(homet+"/.pims/prices")).createNewFile())return(false);
		if(!(new File(homet+"/.pims/log_file")).createNewFile())return(false);
		if(!(new File(homet+"/.pims/Companies")).createNewFile())return(false);
		if(!(new File(homet+"/.pims/alerts")).createNewFile())return(false);

		//Write the login and password into the log_file.
		FileWriter FW = new FileWriter(homet+"/.pims/log_file");
		writeLine(FW, logt+":"+passt);
		FW.close();
		//Write the home in the file user_home in the same directory
		FW = new FileWriter("./user_home");
		writeLine(FW, homet);
		FW.close();

		return(true);
	}

	 public void writeLine(FileWriter fw, String Line)throws Exception{

		int i=0;
		int length = Line.length();
		char buffer[] = new char[length];

		Line.getChars(0, length, buffer, 0);

		fw.write(buffer);
		fw.write('\n');
    	}

	public void actionPerformed(ActionEvent ae){

	   try{
		String action = ae.getActionCommand();
		logt = log.getText();
		passt = pass.getText();
		String ret_passt = ret_pass.getText();
		homet = home.getText();

		if(action.equals("Next")){
			if(logt.equals("") || passt.equals("") || ret_passt.equals("") || homet.equals("")){
				Error e = new Error("Login or Password not Entered.");
				return;
			}
			if(!passt.equals(ret_passt)){
				new Error("Entered passwords do not match");
				return;
			}
			//Call the function that writes into the initial files.
			if(!initializeFiles()){
				new Error("Problem creating the installation files. Please check permissions of ~");
				return;
			}
			//Files Installed. Now go to the next installation site.
			setVisible(false);
			new InstallNext(homet, downloadOption);
		}
		if(action.equals("Cancel"))System.exit(0);
	   }catch(Exception e){}
	}

	public static void main(String args[])throws Exception{
		
		if(args.length > 0 && args[0].equals("-d"))
			new Installation(false);//start the installation program.
		else 
			new Installation(true);//start the installation program.
	}
}