//userDB.java 
//-------------------------------------
//part of YACY
//
//(C) 2005, 2006 by Martin Thelian
//                  Alexander Schier
//
//last change: $LastChangedDate$ by $LastChangedBy$
//Revision: $LastChangedRevision$
//
//This program is free software; you can redistribute it and/or modify
//it under the terms of the GNU General Public License as published by
//the Free Software Foundation; either version 2 of the License, or
//(at your option) any later version.
//
//This program is distributed in the hope that it will be useful,
//but WITHOUT ANY WARRANTY; without even the implied warranty of
//MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//GNU General Public License for more details.
//
//You should have received a copy of the GNU General Public License
//along with this program; if not, write to the Free Software
//Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA


package de.anomic.data;

import java.io.File;
import java.io.IOException;
import java.util.Calendar;
import java.util.Date;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Map;
import java.util.Random;

import net.yacy.cora.protocol.RequestHeader;
import net.yacy.kelondro.blob.MapHeap;
import net.yacy.kelondro.index.RowSpaceExceededException;
import net.yacy.kelondro.logging.Log;
import net.yacy.kelondro.order.Base64Order;
import net.yacy.kelondro.order.CloneableIterator;
import net.yacy.kelondro.order.Digest;
import net.yacy.kelondro.order.NaturalOrder;
import net.yacy.kelondro.util.FileUtils;
import net.yacy.kelondro.util.kelondroException;


public final class userDB {
    
    private static final int USERNAME_MIN_LENGTH = 4;
    
    private MapHeap userTable;
    private final File userTableFile;
    private final Map<String, String> ipUsers = new HashMap<String, String>();
    private final Map<String, Object> cookieUsers = new HashMap<String, Object>();
    
    public userDB(final File userTableFile) throws IOException {
        this.userTableFile = userTableFile;
        userTableFile.getParentFile().mkdirs();
        //this.userTable = new MapView(BLOBTree.toHeap(userTableFile, true, true, 128, 256, '_', NaturalOrder.naturalOrder, userTableFile), 10, '_');
        this.userTable = new MapHeap(userTableFile, 128, NaturalOrder.naturalOrder, 1024 * 64, 10, '_');
    }
    
    void resetDatabase() {
        // deletes the database and creates a new one
        if (userTable != null) userTable.close();
        FileUtils.deletedelete(userTableFile);
        userTableFile.getParentFile().mkdirs();
        try {
            userTable = new MapHeap(userTableFile, 256, NaturalOrder.naturalOrder, 1024 * 64, 10, '_');
        } catch (IOException e) {
            Log.logException(e);
        }
    }
    
    public void close() {
        userTable.close();
    }
    
    public int size() {
        return userTable.size();
    }    
    
    public void removeEntry(final String hostName) {
        try {
            userTable.delete(hostName.toLowerCase().getBytes());
        } catch (final IOException e) {}
    }        
    
    public Entry getEntry(String userName) {
        if(userName.length()>128){
            userName=userName.substring(0, 127);
        }
        Map<String, String> record;
        try {
            record = userTable.get(userName.getBytes());
        } catch (final IOException e) {
            Log.logException(e);
            return null;
        } catch (RowSpaceExceededException e) {
            Log.logException(e);
            return null;
        }
        if (record == null) return null;
        return new Entry(userName, record);
    }    
    
    public Entry createEntry(final String userName, final Map<String, String> userProps) throws IllegalArgumentException{
        final Entry entry = new Entry(userName,userProps);
        return entry;
    }
    
    public String addEntry(final Entry entry) {
        try {
            userTable.insert(entry.userName.getBytes(), entry.mem);
            return entry.userName;
        } catch (final Exception e) {
            Log.logException(e);
            return null;
        }
    }    

    /**
     * use a ProxyAuth String to authenticate a user
     * @param auth a base64 Encoded String, which contains "username:pw".
     */
    public Entry proxyAuth(final String auth) {
        if(auth == null) {
            return null;
        }
        Entry entry = null;

        final String[] tmp= Base64Order.standardCoder.decodeString(auth.trim().substring(6)).split(":");
        if(tmp.length == 2){
            entry = this.passwordAuth(tmp[0], tmp[1]);
        }
        return entry;
    }

    public Entry getUser(final RequestHeader header){
        return getUser(header.get(RequestHeader.AUTHORIZATION), header.getHeaderCookies());
    }

    public Entry getUser(final String auth, final String cookies){
        Entry entry=null;
        if(auth != null) {
            entry=proxyAuth(auth);
        }
        if(entry == null) {
            entry=cookieAuth(cookies);
        }
        return entry;
    }
    /**
     * determinate, if a user has Adminrights from a authorisation http-headerfield it tests both userDB and oldstyle adminpw.
     * 
     * @param auth
     *            the http-headerline for authorisation
     */
    public boolean hasAdminRight(final String auth, final String cookies) {
        final Entry entry = getUser(auth, cookies);
        if (entry != null) {
            return entry.hasRight(Entry.ADMIN_RIGHT);
        }
        // else if(entry != null && cookieAdminAuth(cookies))
        //     return entry.hasAdminRight();
        else {
            return false;
        }
    }

    /**
     * use a ProxyAuth String to authenticate a user and save the ip/username for ipAuth
     * @param auth a base64 Encoded String, which contains "username:pw".
     * @param ip an ip.
     */
    public Entry proxyAuth(final String auth, final String ip) {
        final Entry entry=proxyAuth(auth);
        if(entry == null){
            return null;
        }
        entry.updateLastAccess(false);
        this.ipUsers.put(ip, entry.getUserName());
        return entry;
    }

    /**
     * authenticate a user by ip, if he had used proxyAuth in the last 10 Minutes
     * @param ip the IP of the User
     */
    public Entry ipAuth(final String ip) {
        if(this.ipUsers.containsKey(ip)){
            final String user=this.ipUsers.get(ip);
            final Entry entry=this.getEntry(user);
            final Long entryTimestamp=entry.getLastAccess();
            if(entryTimestamp == null || (System.currentTimeMillis()-entryTimestamp.longValue()) > (1000*60*10) ){ //no timestamp or older than 10 Minutes
                return null;
            }
            return entry; //All OK
        }
        return null;
    }
	
    public Entry passwordAuth(final String user, final String password) {
        final Entry entry = this.getEntry(user);
        final String md5pwd;
        if (entry != null && (md5pwd = entry.getMD5EncodedUserPwd()) != null && md5pwd.equals(Digest.encodeMD5Hex(user+":"+password))) {
            if (entry.isLoggedOut()){
                try {
                    entry.setProperty(Entry.LOGGED_OUT, "false");
                } catch (final Exception e) {
                    Log.logException(e);
                }
                return null;
            }
            return entry;
        }
        return null;
    }
    
    public Entry passwordAuth(final String user, final String password, final String ip){
        final Entry entry=passwordAuth(user, password);
        if(entry == null){
            return null;
        }
        entry.updateLastAccess(false);
        this.ipUsers.put(ip, entry.getUserName()); //XXX: This is insecure. TODO: use cookieauth
        return entry;
    }
    
    public Entry md5Auth(final String user, final String md5) {
        final Entry entry=this.getEntry(user);
        if (entry != null && entry.getMD5EncodedUserPwd().equals(md5)) {
            if (entry.isLoggedOut()){
                try {
                    entry.setProperty(Entry.LOGGED_OUT, "false");
                } catch (final Exception e) {
                    Log.logException(e);
                }
                return null;
            }
            return entry;
        }
        return null;
    }

    public Entry cookieAuth(final String cookieString){
        final String token = getLoginToken(cookieString);
        if (cookieUsers.containsKey(token)) {
            final Object entry = cookieUsers.get(token);
            if (entry instanceof Entry) //String would mean static Admin
                return (Entry)entry;
        }
        return null;
    }
    
    public boolean cookieAdminAuth(final String cookieString){
        final String token = getLoginToken(cookieString);
        if (cookieUsers.containsKey(token)) {
            final Object entry = cookieUsers.get(token);
            if (entry instanceof String && entry.equals("admin")) {
                return true;
            }
        }
        return false;
    }

    public String getCookie(final Entry entry){
        final Random r = new Random();
        final String token = Long.toString(Math.abs(r.nextLong()), 36);
        cookieUsers.put(token, entry);
        return token;
    }

    public String getAdminCookie(){
        final Random r = new Random();
        final String token = Long.toString(Math.abs(r.nextLong()), 36);
        cookieUsers.put(token, "admin");
        return token;
    }
    
    public static String getLoginToken(final String cookies){
        final String[] cookie = cookies.split(";"); //TODO: Mozilla uses "; "
        for (String c :cookie) {
            String[] pair = c.split("=");
            if (pair[0].trim().equals("login")) {
                return pair[1].trim();
            }
        }
        return "";
    }
    
    public void adminLogout(final String logintoken){
        if(cookieUsers.containsKey(logintoken)){
            //XXX: We could check, if its == "admin", but we want to logout anyway.
            cookieUsers.remove(logintoken);
        }
    }
    
    
    public class Entry {
        public static final String MD5ENCODED_USERPWD_STRING = "MD5_user:pwd";
        public static final String AUTHENTICATION_METHOD = "auth_method";
        public static final String LOGGED_OUT = "loggedOut";
        public static final String USER_FIRSTNAME = "firstName";
        public static final String USER_LASTNAME = "lastName";
        public static final String USER_ADDRESS = "address";
        public static final String LAST_ACCESS = "lastAccess";
        public static final String TIME_USED = "timeUsed";
        public static final String TIME_LIMIT = "timeLimit";
        public static final String TRAFFIC_SIZE = "trafficSize";
        public static final String TRAFFIC_LIMIT = "trafficLimit";
        public static final String UPLOAD_RIGHT = "uploadRight";
        public static final String DOWNLOAD_RIGHT = "downloadRight";
        public static final String ADMIN_RIGHT = "adminRight";
        public static final String PROXY_RIGHT = "proxyRight";
        public static final String BLOG_RIGHT = "blogRight";
        public static final String WIKIADMIN_RIGHT = "wikiAdminRight";
        public static final String BOOKMARK_RIGHT = "bookmarkRight";
        
        //to create new rights, you just need to edit this strings
        public static final String RIGHT_TYPES=
        	ADMIN_RIGHT+","+DOWNLOAD_RIGHT+","+UPLOAD_RIGHT+","+PROXY_RIGHT+","+
        	BLOG_RIGHT+","+BOOKMARK_RIGHT+","+WIKIADMIN_RIGHT;
        public static final String RIGHT_NAMES="Admin,Download,Upload,Proxy usage,Blog,Bookmark,Wiki Admin,SOAP";
        
        public static final int PROXY_ALLOK = 0; //can Surf
        public static final int PROXY_ERROR = 1; //unknown error
        public static final int PROXY_NORIGHT = 2; //no proxy right
        public static final int PROXY_TIMELIMIT_REACHED = 3;
        
        // this is a simple record structure that hold all properties of a user
        private Map<String, String> mem;
        private String userName;
        private final Calendar oldDate, newDate;
        
        public Entry(final String userName, final Map<String, String> mem) throws IllegalArgumentException {
            if ((userName == null) || (userName.length() == 0)) 
                throw new IllegalArgumentException("Username needed.");
            if(userName.length()>128){
                throw new IllegalArgumentException("Username too long!");
            }
            
            this.userName = userName.trim(); 
            if (this.userName.length() < USERNAME_MIN_LENGTH) 
                throw new IllegalArgumentException("Username too short. Length should be >= " + USERNAME_MIN_LENGTH);
            
            if (mem == null) this.mem = new HashMap<String, String>();
            else this.mem = mem;            
            
            if (mem == null || !mem.containsKey(AUTHENTICATION_METHOD)) {
                this.mem.put(AUTHENTICATION_METHOD,"yacy");
            }
            this.oldDate=Calendar.getInstance();
            this.newDate=Calendar.getInstance();
        }
        
        public String getUserName() {
            return this.userName;
        }
        
        public String getFirstName() {
            return (this.mem.containsKey(USER_FIRSTNAME)?this.mem.get(USER_FIRSTNAME):null);
        } 
        
        public String getLastName() {
            return (this.mem.containsKey(USER_LASTNAME)?this.mem.get(USER_LASTNAME):null);
        }     
        
        public String getAddress() {
            return (this.mem.containsKey(USER_ADDRESS)?this.mem.get(USER_ADDRESS):null);
        } 
        
        public long getTimeUsed() {
            if (this.mem.containsKey(TIME_USED)) {
                try{
                    return Long.parseLong(this.mem.get(TIME_USED));
                }catch(final NumberFormatException e){
                    return 0;
                }
            }
            try {
                this.setProperty(TIME_USED,"0");
            } catch (final Exception e) {
                Log.logException(e);
            }
            return 0;
        }
        
        public long getTimeLimit() {
            if (this.mem.containsKey(TIME_LIMIT)) {
                try{
                    return Long.parseLong(this.mem.get(TIME_LIMIT));
                }catch(final NumberFormatException e){
                    return 0;
                }
            }
            try {
                this.setProperty(TIME_LIMIT,"0");
            } catch (final Exception e) {
                Log.logException(e);
            }
            return 0;
        }
        
        public long getTrafficSize() {
            if (this.mem.containsKey(TRAFFIC_SIZE)) {
                return Long.parseLong(this.mem.get(TRAFFIC_SIZE));
            }
            try {
                this.setProperty(TRAFFIC_SIZE,"0");
            } catch (final Exception e) {
                Log.logException(e);
            }
            return 0;
        }
        
        public Long getTrafficLimit() {
            return (this.mem.containsKey(TRAFFIC_LIMIT)?Long.valueOf(this.mem.get(TRAFFIC_LIMIT)):null);
        }
        
        public long updateTrafficSize(final long responseSize) {
            if (responseSize < 0) throw new IllegalArgumentException("responseSize must be greater or equal zero.");
            
            final long currentTrafficSize = getTrafficSize();
            final long newTrafficSize = currentTrafficSize + responseSize;
            try {
                this.setProperty(TRAFFIC_SIZE,Long.toString(newTrafficSize));
            } catch (final Exception e) {
                Log.logException(e);
            }
            return newTrafficSize;
        }
        
        public Long getLastAccess() {
            return (this.mem.containsKey(LAST_ACCESS)?Long.valueOf(this.mem.get(LAST_ACCESS)):null);
        }        
        
        public int surfRight(){
            final long timeUsed=this.updateLastAccess(true);
            if (!this.hasRight(Entry.PROXY_RIGHT))
                return PROXY_NORIGHT;

            if(! (this.getTimeLimit() <= 0 || ( timeUsed < this.getTimeLimit())) ){ //no timelimit or timelimit not reached
                return PROXY_TIMELIMIT_REACHED;
            }
            return PROXY_ALLOK;
        }

        public boolean canSurf(){
            return (this.surfRight() == PROXY_ALLOK) ? true : false;
        }

        public long updateLastAccess(final boolean incrementTimeUsed) {
            return updateLastAccess(System.currentTimeMillis(), incrementTimeUsed);
        }

        public long updateLastAccess(final long timeStamp, final boolean incrementTimeUsed) {
            if (timeStamp < 0) throw new IllegalArgumentException();
            
            final Long lastAccess = this.getLastAccess();                                            
            long newTimeUsed = getTimeUsed();            
            
            if (incrementTimeUsed) {
                if ((lastAccess == null)||((lastAccess != null)&&(timeStamp-lastAccess.longValue()>=1000*60))) { //1 minute
                    //this.mem.put(TIME_USED,Long.toString(newTimeUsed = ++oldTimeUsed));  
                    newTimeUsed++;  
                    if(lastAccess != null){
                        this.oldDate.setTime(new Date(lastAccess.longValue()));
                        this.newDate.setTime(new Date(System.currentTimeMillis()));
                        if(
                                this.oldDate.get(Calendar.DAY_OF_MONTH) != this.newDate.get(Calendar.DAY_OF_MONTH) ||
                                this.oldDate.get(Calendar.MONTH) != this.newDate.get(Calendar.MONTH) ||
                                this.oldDate.get(Calendar.YEAR) != this.newDate.get(Calendar.YEAR)
                        ){ //new Day, reset time
                                newTimeUsed=0;
                        }
                    }else{ //no access so far
                            newTimeUsed=0;
                    }
                    this.mem.put(TIME_USED,Long.toString(newTimeUsed));
                    this.mem.put(LAST_ACCESS,Long.toString(timeStamp)); //update Timestamp
                }
            } else {
                this.mem.put(LAST_ACCESS,Long.toString(timeStamp)); //update Timestamp
            }
            
            try {
                userDB.this.userTable.insert(getUserName().getBytes(), this.mem); 
            } catch(final Exception e){
                Log.logException(e);
            }
            return newTimeUsed;
        }
        
        public String getMD5EncodedUserPwd() {
            return (this.mem.containsKey(MD5ENCODED_USERPWD_STRING)?this.mem.get(MD5ENCODED_USERPWD_STRING):null);
        }
        
        public Map<String, String> getProperties() {
            return this.mem;
        }
        
        public void setProperty(final String propName, final String newValue) throws IOException, RowSpaceExceededException {
            this.mem.put(propName,  newValue);
            userDB.this.userTable.insert(getUserName().getBytes(), this.mem);
        }
        
        public String getProperty(final String propName, final String defaultValue) {
            return (this.mem.containsKey(propName)?this.mem.get(propName):defaultValue);
        }
        public boolean hasRight(final String rightName){
            return (this.mem.containsKey(rightName)?this.mem.get(rightName).equals("true"):false);
        }
        /**
         * @deprecated use hasRight(UPLOAD_RIGHT) instead
         */
        @Deprecated
        public boolean hasUploadRight() {
            return this.hasRight(UPLOAD_RIGHT);
        }
        /**
         * @deprecated use hasRight(DOWNLOAD_RIGHT) instead
         */
        @Deprecated
        public boolean hasDownloadRight() {
        	return this.hasRight(DOWNLOAD_RIGHT);
        }
        /**
         * @deprecated use hasRight(PROXY_RIGHT) instead
         */
        @Deprecated
        public boolean hasProxyRight() {
        	return this.hasRight(PROXY_RIGHT);
        }
        /**
         * @deprecated use hasRight(ADMIN_RIGHT) instead
         */
        @Deprecated
        public boolean hasAdminRight() {
        	return this.hasRight(ADMIN_RIGHT);
        }
        /**
         * @deprecated use hasRight(BLOG_RIGHT) instead
         */
        @Deprecated
        public boolean hasBlogRight() {
        	return this.hasRight(BLOG_RIGHT);
        }
        /**
         * @deprecated use hasRight(WIKIADMIN_RIGHT) instead
         */
        @Deprecated
        public boolean hasWikiAdminRight() {
        	return this.hasRight(WIKIADMIN_RIGHT);
        }
        /**
         * @deprecated use hasRight(BOOKMARK_RIGHT) instead
         */
        @Deprecated
        public boolean hasBookmarkRight() {
        	return this.hasRight(BOOKMARK_RIGHT);
        }

        public boolean isLoggedOut(){
        	   return (this.mem.containsKey(LOGGED_OUT)?this.mem.get(LOGGED_OUT).equals("true"):false);
        }

        public void logout(final String ip, final String logintoken){
            logout(ip);
            if(cookieUsers.containsKey(logintoken)){
                cookieUsers.remove(logintoken);
            }
        }

        public void logout(final String ip) {
    	   try {
               setProperty(LOGGED_OUT, "true");
               if (ipUsers.containsKey(ip)){
                       ipUsers.remove(ip);
               }
    	   } catch (final Exception e) {
               Log.logException(e);
           }
        }

        public void logout(){
            logout("xxxxxx");
        }

        @Override
        public String toString() {
            final StringBuilder str = new StringBuilder();
            
            str.append((this.userName==null)?"null":this.userName).append(": ");
            
            if (this.mem != null) {     
                str.append(this.mem.toString());
            } 
            
            return str.toString();
        }    
        
    }
    
    public Iterator<Entry> iterator(final boolean up) {
        // enumerates users
        try {
            return new userIterator(up);
        } catch (final IOException e) {
            return new HashSet<Entry>().iterator();
        }
    }


    public class userIterator implements Iterator<Entry> {
        // the iterator iterates all userNames
        CloneableIterator<byte[]> userIter;
        //userDB.Entry nextEntry;
        
        public userIterator(final boolean up) throws IOException {
            this.userIter = userDB.this.userTable.keys(up, false);
            //this.nextEntry = null;
        }
        
        public boolean hasNext() {
            try {
                return this.userIter.hasNext();
            } catch (final kelondroException e) {
                resetDatabase();
                return false;
            }
        }
        
        public Entry next() {
            try {
                return getEntry(new String(this.userIter.next()));
            } catch (final kelondroException e) {
                resetDatabase();
                return null;
            }
        }
        
        public void remove() {
//            if (this.nextEntry != null) {
//                try {
//                    final Object userName = this.nextEntry.getUserName();
//                    if (userName != null) removeEntry((String) userName);
//                } catch (final kelondroException e) {
//                    resetDatabase();
//                }
//            }
            throw new UnsupportedOperationException("Method not implemented yet.");
        }
    }    
    
}