package org.freertr.serv;

import java.io.File;
import java.io.RandomAccessFile;
import java.util.List;
import org.freertr.cfg.cfgInit;
import org.freertr.pipe.pipeLine;
import org.freertr.pipe.pipeSide;
import org.freertr.prt.prtGenConn;
import org.freertr.prt.prtServS;
import org.freertr.enc.encUrl;
import org.freertr.tab.tabGen;
import org.freertr.user.userFilter;
import org.freertr.user.userFlash;
import org.freertr.user.userHelp;
import org.freertr.util.cmds;
import org.freertr.util.debugger;
import org.freertr.util.logger;

/**
 * gopher (rfc1436) server
 *
 * @author matecsaba
 */
public class servGopher extends servGeneric implements prtServS {

    /**
     * create instance
     */
    public servGopher() {
    }

    /**
     * port number
     */
    public final static int portNum = 70;

    /**
     * root folder
     */
    public String rootFolder = "/data/";

    /**
     * name of server
     */
    public String serverName = "";

    /**
     * directory listing allowed
     */
    public boolean dirListing = false;

    /**
     * defaults text
     */
    public final static userFilter[] defaultF = {
        new userFilter("server gopher .*", cmds.tabulator + "port " + portNum, null),
        new userFilter("server gopher .*", cmds.tabulator + "protocol " + proto2string(protoAllStrm), null),
        new userFilter("server gopher .*", cmds.tabulator + cmds.negated + cmds.tabulator + "dirlist", null)
    };

    public userFilter[] srvDefFlt() {
        return defaultF;
    }

    public boolean srvAccept(pipeSide pipe, prtGenConn id) {
        pipe.setTime(120000);
        pipe.lineRx = pipeSide.modTyp.modeCRtryLF;
        pipe.lineTx = pipeSide.modTyp.modeCRLF;
        new servGopherConn(this, pipe);
        return false;
    }

    public void srvShRun(String beg, List<String> l, int filter) {
        cmds.cfgLine(l, !dirListing, beg, "dirlist", "");
        l.add(beg + "path " + rootFolder);
        l.add(beg + "server " + serverName);
    }

    public boolean srvCfgStr(cmds cmd) {
        String s = cmd.word();
        if (s.equals("path")) {
            rootFolder = "/" + encUrl.normalizePath(cmd.word() + "/");
            return false;
        }
        if (s.equals("server")) {
            serverName = cmd.word();
            return false;
        }
        if (s.equals("dirlist")) {
            dirListing = true;
            return false;
        }
        if (!s.equals(cmds.negated)) {
            return true;
        }
        s = cmd.word();
        if (s.equals("path")) {
            rootFolder = "/data/";
            return false;
        }
        if (s.equals("server")) {
            serverName = "";
            return false;
        }
        if (s.equals("dirlist")) {
            dirListing = false;
            return false;
        }
        return true;
    }

    public void srvHelp(userHelp l) {
        l.add(null, false, 1, new int[]{2}, "path", "set root folder");
        l.add(null, false, 2, new int[]{-1}, "<path>", "name of root folder");
        l.add(null, false, 1, new int[]{2}, "server", "set domain name");
        l.add(null, false, 2, new int[]{-1}, "<str>", "domain name of server");
        l.add(null, false, 1, new int[]{-1}, "dirlist", "allow directory listing");
    }

    public String srvName() {
        return "gopher";
    }

    public int srvPort() {
        return portNum;
    }

    public int srvProto() {
        return protoAllStrm;
    }

    public boolean srvInit() {
        return genStrmStart(this, new pipeLine(32768, false), 0);
    }

    public boolean srvDeinit() {
        return genericStop(0);
    }

}

class servGopherConn implements Runnable {

    private servGopher lower;

    private pipeSide pipe;

    public servGopherConn(servGopher parent, pipeSide stream) {
        lower = parent;
        pipe = stream;
        logger.startThread(this);
    }

    public void sendSeparator() {
        byte[] buf = new byte[1];
        buf[0] = 9;
        pipe.blockingPut(buf, 0, buf.length);
    }

    public void sendLine(String desc, String path, String serv, int port) {
        pipe.strPut(desc);
        sendSeparator();
        pipe.strPut(path);
        sendSeparator();
        pipe.strPut(serv);
        sendSeparator();
        pipe.linePut("" + port);
    }

    private boolean sendOneFile(String s) {
        RandomAccessFile fr;
        long siz = -1;
        try {
            fr = new RandomAccessFile(s, "r");
        } catch (Exception e) {
            return true;
        }
        try {
            siz = fr.length();
        } catch (Exception e) {
        }
        for (long pos = 0; pos < siz;) {
            final int max = 8192;
            long rndl = siz - pos;
            if (rndl > max) {
                rndl = max;
            }
            pos += rndl;
            int rndi = (int) rndl;
            byte[] buf = new byte[rndi];
            try {
                fr.read(buf, 0, rndi);
            } catch (Exception e) {
                break;
            }
            if (pipe.morePut(buf, 0, rndi) < rndi) {
                try {
                    fr.close();
                } catch (Exception e) {
                }
                return false;
            }
        }
        try {
            fr.close();
        } catch (Exception e) {
        }
        return siz < 0;
    }

    private boolean sendOneDir(String s, String p) {
        if (s.lastIndexOf("/") + 1 < s.length()) {
            s += "/";
            p += "/";
        }
        if (!sendOneFile(s + "index.gopher")) {
            return false;
        }
        if (!lower.dirListing) {
            sendLine("inot found", "", "", 0);
            return true;
        }
        File[] fl = userFlash.dirList(s);
        if (fl == null) {
            return true;
        }
        sendLine("idirectory listing of " + p, "", "", 0);
        sendLine("1/", "/", lower.serverName, lower.srvPort);
        sendLine("1..", p + "../", lower.serverName, lower.srvPort);
        for (int i = 0; i < fl.length; i++) {
            File f = fl[i];
            String a = f.getName();
            String t = "9";
            if (f.isDirectory()) {
                a += "/";
                t = "1";
            }
            sendLine(t + a, p + a, lower.serverName, lower.srvPort);
        }
        sendLine("igenerated by " + cfgInit.versionName, "", "", 0);
        return false;
    }

    public void run() {
        try {
            String s = pipe.lineGet(1);
            s = encUrl.normalizePath(s);
            if (debugger.servGopherTraf) {
                logger.debug("req " + s);
            }
            encUrl u = encUrl.parseOne(s);
            String p = lower.rootFolder + s;
            boolean b = true;
            if (u.toFileName().length() > 0) {
                b = sendOneFile(p);
            } else {
                b = sendOneDir(p, s);
            }
            if (b) {
                sendLine("inot found", "", "", 0);
            }
        } catch (Exception e) {
            logger.traceback(e);
        }
        pipe.setClose();
    }

}
