// yacyNewsActions.java
// -----------------------
// part of YaCy
// (C) by Michael Peter Christen; mc@anomic.de
// first published on http://www.anomic.de
// Frankfurt, Germany, 2005
// last major change: 13.07.2005
//
// 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
//
// Using this software in any meaning (reading, learning, copying, compiling,
// running) means that you agree that the Author(s) is (are) not responsible
// for cost, loss of data or any harm that may be caused directly or indirectly
// by usage of this softare or this documentation. The usage of this software
// is on your own risk. The installation and usage (starting/running) of this
// software may allow other people or application to access your computer and
// any attached devices and is highly dependent on the configuration of the
// software which must be done by the user of the software; the author(s) is
// (are) also not responsible for proper configuration and usage of the
// software, even if provoked by documentation provided together with
// the software.
//
// Any changes to this file according to the GPL as documented in the file
// gpl.txt aside this file in the shipment you received can be done to the
// lines that follows this copyright notice here, but changes must not be
// done inside the copyright notice above. A re-distribution must contain
// the intact and unchanged copyright notice.
// Contributions and changes to the program code must be marked as such.

package de.anomic.yacy;

import java.io.File;
import java.io.IOException;
import java.util.HashSet;

public class yacyNewsPool {
    
    public static final int INCOMING_DB  = 0;
    public static final int PROCESSED_DB = 1;
    public static final int OUTGOING_DB  = 2;
    public static final int PUBLISHED_DB = 3;
    
    public static final String[] category = {
        "prfleupd", // a profile entry was updated (implemented)
        "crwlstrt", // a crawl with remote indexing was startet
        "crwlstop", // a crawl with remote indexing was stopped
        "crwlcomm", // a comment on a crawl with remote indexing
        "blckladd", // a public blacklist entry was added
        "blcklavt", // a vote and comment on a public blacklist add
        "blckldel", // a public blacklist entry was deleted
        "blckldvt", // a vote and comment on a public blacklist delete
        "flshradd", // a file was added to the file share
        "flshrdel", // a file was added to the file share
        "flshrcom", // a comment to a file share entry
        "brdcstin", // a broadcast news in rss format
        "brdcstup", // an update to a broadcast
        "brdcstvt", // a vote on a broadcast
        "brdcstco", // a comment on a broadcast
        "bkmrkadd", // a bookmark was added/created
        "bkmrkavt", // a vote and comment on a bookmark add
        "bkmrkmov", // a bookmark was moved
        "bkmrkmvt", // a vote and comment on a bookmark move
        "bkmrkdel", // a bookmark was deleted
        "bkmrkdvt", // a vote and comment on a bookmark delete
        "wiki_add", // a wiki page was created
        "wiki_upd", // a wiki page was updated
        "wiki_del"  // a wiki page das deleted
        // urlvotes
    };
    public static HashSet categories;
    static {
        categories = new HashSet();
        for (int i = 0; i < category.length; i++) categories.add(category[i]);
    }
    
    private yacyNewsDB newsDB;
    private yacyNewsQueue outgoingNews, publishedNews, incomingNews, processedNews;
    private int maxDistribution;
    
    
    public yacyNewsPool(File yacyDBPath, int bufferkb) throws IOException {
        newsDB = new yacyNewsDB(new File(yacyDBPath, "news1.db"), bufferkb);
        outgoingNews  = new yacyNewsQueue(new File(yacyDBPath, "newsOut1.stack"), newsDB);
        publishedNews = new yacyNewsQueue(new File(yacyDBPath, "newsPublished1.stack"), newsDB);
        incomingNews  = new yacyNewsQueue(new File(yacyDBPath, "newsIn1.stack"), newsDB);
        processedNews = new yacyNewsQueue(new File(yacyDBPath, "newsProcessed1.stack"), newsDB);
        maxDistribution = 30;
    }
    
    public void publishMyNews(yacyNewsRecord record) throws IOException {
        // this shall be called if our peer generated a new news record and wants to publish it
        if (newsDB.get(record.id()) == null) {
            incomingNews.push(record); // we want to see our own news..
            outgoingNews.push(record); // .. and put it on the publishing list
        }
    }
    
    public yacyNewsRecord myPublication() throws IOException {
        // generate a record for next peer-ping
        if (outgoingNews.size() == 0) return null;
        yacyNewsRecord record = outgoingNews.topInc();
        if (record.distributed() >= maxDistribution) {
            // move record to its final position. This is only for history
            publishedNews.push(outgoingNews.pop(0));
        }
        return record;
    }
    
    public void enqueueIncomingNews(yacyNewsRecord record) throws IOException {
        // called if a news is attached to a seed

        // check consistency
        if (record.id() == null) return;
        if (record.id().length() != yacyNewsRecord.idLength()) return;
        if (record.category() == null) return;
        if (!(categories.contains(record.category()))) return;
        if (record.created().getTime() == 0) return;
        
        // double-check with old news
        if (newsDB.get(record.id()) != null) return;
        incomingNews.push(record);
    }
    
    public int size(int dbKey) {
        return switchQueue(dbKey).size();
    }
    
    public int automaticProcess() throws IOException {
        // processes news in the incoming-db
        // returns number of processes
        yacyNewsRecord record;
        int pc = 0;
        synchronized (incomingNews) {
            for (int i = incomingNews.size() - 1; i >= 0; i--) {
                record = incomingNews.top(i);
                if ((i > 500) || (automaticProcessP(record))) {
                    incomingNews.pop(i);
                    processedNews.push(record);
                    //newsDB.remove(id);
                    pc++;
                }
            }
        }
        return pc;
    }
    
    private boolean automaticProcessP(yacyNewsRecord record) {
        if (record == null) return false;
        if (record.category() == null) return true;
        if ((yacyCore.universalTime() - record.created().getTime()) > (1000 * 60 * 60 * 24 * 7) /* 1 Week */) {
	    // remove everything after 1 week
            return true;
        }
        if ((record.category().equals("wiki_upd")) &&
            ((yacyCore.universalTime() - record.created().getTime()) > (1000 * 60 * 60 * 24) /* 1 Day */)) {
            return true;
        }
        if ((record.category().equals("crwlstrt")) &&
            ((yacyCore.universalTime() - record.created().getTime()) > (1000 * 60 * 60 * 24) /* 1 Day */)) {
            yacySeed seed = yacyCore.seedDB.get(record.originator());
            if (seed == null) return false;
            try {
                return (Integer.parseInt(seed.get("ISpeed", "-")) < 10);
            } catch (NumberFormatException ee) {
                return true;
            }
        }
        return false;
    }
    
    public yacyNewsRecord get(int dbKey, int element) throws IOException {
        yacyNewsQueue queue = switchQueue(dbKey);
        yacyNewsRecord record;
        synchronized (queue) {
            record = queue.top(element);
            if (record == null) queue.pop(element);
        }
        return record;
    }
    
    public synchronized yacyNewsRecord getSpecific(int dbKey, String category, String key, String value) throws IOException {
        yacyNewsQueue queue = switchQueue(dbKey);
        yacyNewsRecord record;
        String s;
        for (int i = queue.size() - 1; i >= 0; i--) {
            record = queue.top(i);
            if ((record != null) && (record.category().equals(category))) {
                s = (String) record.attributes().get(key);
                if ((s != null) && (s.equals(value))) return record;
            }
        }
        return null;
    }
    
    public synchronized yacyNewsRecord getByOriginator(int dbKey, String category, String originatorHash) throws IOException {
        yacyNewsQueue queue = switchQueue(dbKey);
        yacyNewsRecord record;
        String s;
        for (int i = queue.size() - 1; i >= 0; i--) {
            record = queue.top(i);
            if ((record != null) &&
                (record.category().equals(category)) &&
                (record.originator().equals(originatorHash))) {
                return record;
            }
        }
        return null;
    }
    
    private yacyNewsQueue switchQueue(int dbKey) {
        switch (dbKey) {
            case INCOMING_DB:	return incomingNews;
            case PROCESSED_DB:  return processedNews;
            case OUTGOING_DB:   return outgoingNews;
            case PUBLISHED_DB:  return publishedNews;
        }
        return null;
    }
    
    public void moveOff(int dbKey, String id) throws IOException {
        // this is called if a queue element shall be moved to another queue or off the queue
        // it depends on the dbKey how the record is handled
        switch (dbKey) {
            case INCOMING_DB:	moveOff(incomingNews, processedNews, id); break;
            case PROCESSED_DB:  moveOff(processedNews, null,id); break;
            case OUTGOING_DB:   moveOff(outgoingNews, publishedNews, id); break;
            case PUBLISHED_DB:  moveOff(publishedNews, null, id); break;
        }
    }

    private boolean moveOff(yacyNewsQueue fromqueue, yacyNewsQueue toqueue, String id) throws IOException {
        // called if a published news shall be removed
        // the news is also removed from the news database
        yacyNewsRecord record;
        synchronized (fromqueue) {
            for (int i = fromqueue.size() - 1; i >= 0; i--) {
                record = fromqueue.top(i);
                if ((record != null) && (record.id().equals(id))) {
                    fromqueue.pop(i);
                    if (toqueue != null) toqueue.push(record);
                    //newsDB.remove(id);
                    return true;
                }
            }
        }
        return false;
    }
    
    
}