/******************************************************************************
*
* Copyright: Intellectual Property of Four Elements Capital Pte Ltd, Singapore.
* All rights reserved.
*
******************************************************************************/

package com.fourelementscapital.auth;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;


/**
 * UserThemeAccessPermission provides functions to convert theme access permissions into 'rwx' permission group.
 * Example : a user has 'X' permission in 'computing' theme. The 'computing' theme then will be included in 'rwx' permission group.
 * Another Example : a user has 'U' permission in 'etrading' theme. The 'etrading' theme then will be included in 'rx' permission group.
 */
public class UserThemeAccessPermission {
	
	/**
	 * Username
	 */		
	private String username;
	
	/**
	 * 'rwx' permission group
	 */			
	private ArrayList<String> rwx = new ArrayList<String>();
	
	/**
	 * 'rx' permission group
	 */			
	private ArrayList<String> rx = new ArrayList<String>();
	
	/**
	 * 'r' permission group
	 */			
	private ArrayList<String> r = new ArrayList<String>(); 

	
    /**
    * Constructor. Creates a new UserThemeAccessPermission object
    * @param un Username
    */	
	public UserThemeAccessPermission(String un) {
		this.username=un;
	}
	
    /**
    * Get rwx permission group
    * @return rwx list
    */		
	public ArrayList<String> getRwx() {
		return rwx;
	}

    /**
    * Get rx permission group
    * @return rx list
    */	
	public ArrayList<String> getRx() {
		return rx;
	}

    /**
    * Get r permission group
    * @return r list
    */	
	public ArrayList<String> getR() {
		return r;
	}
	
	/**
	 * Add permission with user's themes
	 * @param themes
	 * @throws Exception
	 */	 
	public void addPermissionWithThemes(Map<String,String> themes) throws Exception {
		try{			
			Map<String,String> resolved = this.replacePermissions(themes);
			for(Iterator<String> it=resolved.keySet().iterator();it.hasNext();){
				String theme=it.next();
				String val=resolved.get(theme);
				if(val!=null && val.trim().equalsIgnoreCase("rwx")) getRwx().add(theme);
				if(val!=null && val.trim().equalsIgnoreCase("rx")) getRx().add(theme);
				if(val!=null && val.trim().equalsIgnoreCase("r")) getR().add(theme);					
			}		
		} catch(Exception e) {
			throw e;
		} 
	}	

	/**
	 * Replace the permission letter with 'rwx'.
	 * @param data
	 * @return themes with 'rwx' permissions 
	 * @throws Exception
	 */
	 public static Map<String,String> replacePermissions(Map<String,String> data) throws Exception {
		 HashMap<String,String> perm = new HashMap<String,String>();
		 perm.put("X","rwx");
		 perm.put("S","rwx");
		 perm.put("B","rwx");
		 perm.put("C","rwx");
		 perm.put("U","rx");
		 perm.put("N","r");
		 perm.put("M","rwx");
		 for(String key: data.keySet()){
			 data.put(key, perm.get(data.get(key)));			 
		 }
		 return data;
	 }		

	/**
	 * Overriding to make unique objects per username 
	 * @param obj Instance of AuthUser or other object
	 * @return true if obj's username is equal with class' username
	 */
	public boolean equals(Object obj ) {
		if(obj instanceof UserThemeAccessPermission){
			UserThemeAccessPermission other=(UserThemeAccessPermission)obj;
			if(other.username.equals(this.username)){
				return true;
			}else{
				return false;
			}
		}else{
			return false;
		}
	}
	
	/**
	 * Override toString() method
	 * @return username string
	 */	
	public String toString() {
		return ""+this.username;
	}
	
	
}