package Controller;

import Util.*;

import java.io.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.AbstractButton;
import javax.swing.JButton;
import java.util.*;
import javax.swing.*;



public class History implements ActionListener{

    private int maxRecord = 4;
    private Vector  projs;
    
    private JMenu listMenu;
    
    // the controller
    private StructureApp app;
    
    public History(StructureApp app){
	
	this.app = app;
	File historyFile = new File(System.getProperty("user.home"),".structure");
	projs = new Vector();
	if(historyFile.exists())
	    loadProjVec(historyFile.getAbsolutePath());
    }

    private void loadProjVec(String historyPath){
	
	InFile infile = null;
	try{
	    infile = new InFile(historyPath);
	}catch(FileNotFoundException e){
	    return;
	}
	
	String str = new String();
	// read file line by line
	while(true){
	    try{
		str = infile.readLine();
	    }catch(Exception re){
	    }
	    if(str == null)
		return;
	    projs.add(new File(str));
	}
	
    }

    
    public JMenu getHistoryMenu(){
	
	listMenu = new JMenu("Recent projects");
	
      
	if(projs.size()==0){
	    JMenuItem emptyItem = new JMenuItem(" (Empty) ");
	    emptyItem.setEnabled(false);
	    listMenu.add(emptyItem);
	    return listMenu;
	}
	
	
	// else write out proj on the menu
	Vector savedNames = new Vector();
	for(int i=0;i<projs.size();i++){
	    String projname = ((File)(projs.elementAt(i))).getName();
	    int count=0;
	    for(int j=0;j<savedNames.size();j++){
		String tempname = (String)savedNames.elementAt(j);
		if(tempname.equals(projname))
		    count++;
	    }
	    savedNames.addElement(projname);

	    JMenuItem item = null;

	    if(count==0)
		item = new JMenuItem(projname);
	    else
		item = new JMenuItem(projname+"("+(count+1)+")");	
	    String fullpath = ((File)(projs.elementAt(i))).getAbsolutePath();
	    item.setActionCommand(fullpath+".spj");
	    item.addActionListener(this);
	    
	    listMenu.add(item);
	}

	return listMenu;
    }

    
    public void updateHistory(String fullname, boolean updatemenu){
	
	// check if it is a old one, put it to the first if yes
	for(int i=0;i<projs.size();i++){
	    String projname = ((File)projs.elementAt(i)).getAbsolutePath();
	    if(projname.equals(fullname)){
		projs.removeElementAt(i);
	    }
	}
	
	// else
	
	if(projs.size() == maxRecord)
	    projs.removeElementAt(maxRecord-1);
	
	projs.insertElementAt(new File(fullname),0);
	
	// if need , visually update the menu
	if(updatemenu){
	    listMenu.removeAll();
	    Vector savedNames = new Vector();
	    for(int i=0;i<projs.size();i++){
		String projname = ((File)(projs.elementAt(i))).getName();
		int count=0;
		for(int j=0;j<savedNames.size();j++){
		    String tempname = (String)savedNames.elementAt(j);
		    if(tempname.equals(projname))
		       count++;
		}
		savedNames.addElement(projname);
		
		JMenuItem item = null;
		if(count==0)
		    item = new JMenuItem(projname);
		else
		    item = new JMenuItem(projname+"("+(count+1)+")");		
		String fullpath = ((File)(projs.elementAt(i))).getAbsolutePath();
		item.setActionCommand(fullpath+".spj");
		item.addActionListener(this);
		
		listMenu.add(item);
	    }
	}
    }


    public void writeHistoryFile(){
	File historyFile = new File(System.getProperty("user.home"),".structure");
	PrintStream out = OpenOutputFile(historyFile);
	for(int i=0;i<projs.size();i++)
	    out.println(((File)projs.elementAt(i)).getAbsolutePath());
	out.close();
    }
    
    
     
    public void actionPerformed(ActionEvent e){
	
	String projName = e.getActionCommand();
	/*
	for(int i=0;i<projs.size();i++){
	    
	    File projDir = (File)projs.elementAt(i);
	    if(projName.equals(projDir.getName())){
		File spjFile = new File(projDir.getAbsolutePath()+".spj");
		app.openProj(spjFile.getAbsolutePath());
		return;
	    }
	}
	*/
	app.openProj(projName);
	
	
    }
    
     private static PrintStream OpenOutputFile(File file){
	 
	 PrintStream  out;
	 try {  // try to open output file as well...	    
	     out = new PrintStream(new FileOutputStream(file));
	 } 
	 catch (FileNotFoundException e) {
	     System.err.println("**Error: unable to open output file.");
	     out = null;
	 }//try-catch
	 catch (SecurityException e) {
	     System.err.println("**Error: no permission to write output file.");
	     out = null;
	 }//try-catch
	 catch (IOException e) {
	     System.err.println("**Error: unknown error opening output file.");
	     out = null;
	 }//try-catch
	 
	 return out;
     }
    
    
    
}