/*      net_sccs.java
        Copyright 1998 Kyle R. Burton

This is free software; you can redistribute it and/or modify
it under the tearms of the GNU General Public License as published by 
the Free Software Foundation; either version 2, or (at your option)
any later version.

This file is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANY; 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 software; see the file COPYING.  If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.

*/

/**
 *
 * file: net_sccs.java
 *
 * description:  this is an implmentation of the client-side of net_sccs.
 *
 *
 * revision list:
 *   Sat May  2 15:31:04 EDT 1998 KRB - merged add, get, checkout, and checkin functions 
 *     into this file.  Now there's only one file...this was an amlost complete
 *     re-write of the core modules.
 *   Sun May  3 14:27:15 EDT 1998 KRB - added local configuraiton file loading,
 *     and creation code...
 *
 */
import java.io.*;
import java.net.*;
import java.util.*;

public class net_sccs {
  public static final int def_buff_len         = 1024;
  public static final String file_begin_string = "<!--begin file-->";
  public static final String file_end_string   = "<!--end file-->";

  // to read the conf info, we'll search these in the order they're 
  // listed here -- env var, home dir, current dir, and root of c: drive...
  public String conf_env          = "NET_SCCS_HOST";
  public String conf_home         = "~/.net_sccs";
  public String conf_pwd          = "./.net_sccs";
  public String conf_win          = "file://C|/.net_sccs";
  public String conf_use          = null;
  public String language          = "english";
  public String default_host      = "localhost";

  String file              = null;
  String path              = null;
  String version           = null;
  String uname             = null;
  String password          = null;
  String action            = null;
  String comment           = null;
  String alt_conf          = null;
  boolean ask_for_uname    = true;
  public boolean debug     = false;
  boolean show_help        = false;
  net_msgs msgs            = null;
  Hashtable actions        = null;
  String net_sccs_host     = null;
  BufferedReader stdin     = new BufferedReader(new InputStreamReader(System.in));

  public static void main( String args[] ) {
    net_sccs app = new net_sccs(args);
    return;
  }

  public net_sccs( String args[] ) {
    actions = new Hashtable();
    // these are all the currently supported actions...
    actions.put( "add",      "a" );
    actions.put( "get",      "g" );
    actions.put( "checkout", "o" );
    actions.put( "checkin",  "i" );

    getopts opts = new getopts( "a:c:f:hl:o:p:r:u:v:w:x", args );
    action        =  opts.opt('a') ? opts.get_value('a') : null;
    comment       =  opts.opt('c') ? opts.get_value('c') : null;
    file          =  opts.opt('f') ? opts.get_value('f') : null;
    show_help     =  opts.opt('h');
    language      =  opts.opt('l') ? opts.get_value('l') : null;
    alt_conf      =  opts.opt('o') ? opts.get_value('o') : null;
    path          =  opts.opt('p') ? opts.get_value('p') : null;
    default_host  =  opts.opt('r') ? opts.get_value('r') : null;
    uname         =  opts.opt('u') ? opts.get_value('u') : null;
    version       =  opts.opt('v') ? opts.get_value('v') : null;
    password      =  opts.opt('w') ? opts.get_value('w') : null;
    debug         =  opts.opt('x');

    String home = System.getProperty("user.home");
    if( null != home ) {
      conf_home = home + "/.net_sccs";
      if( debug ) {
        System.out.println("[client] setting conf_home = " + conf_home );
      }
    }
    else {
      // assume dos style platform
      conf_home = "c:\\.net_sccs";
      if( debug ) {
        System.out.println("[client] setting conf_home = " + conf_home );
      }
    }

    // try to get the config info...
    if( !configure() ) { // error
      System.out.println("[client] Error, unable to find configuration file.");
      if( create_config_from_user() ) {
        System.out.println("[client] attempting to re-read the config file.");
        if( !configure() ) {
          System.out.println("[client] Error, unable to read configuration file.");
          System.exit(1);
        }
      }
      else {
        System.exit(1);
      }
    }

    try { // to get any missing arguments from the user...
      while( null == uname || uname.length() < 1 ) {
        System.out.print("[client] User:  ");
        uname = stdin.readLine();
      }
  
      while( null == password || password.length() < 1 ) {
        System.out.print("[client] Password:  ");
        password = stdin.readLine();
      }
  
      while( null == action || action.length() < 1 || !actions.containsKey(action) ) {
        System.out.print("[client] Action:  ");
        action = stdin.readLine();
        if( !actions.containsKey(action) ) {
          System.out.println("[client] Error, valid actions are:  add, get, checkout, and checkin.");
          action = null;
        }
      }
  
      while( null == file || file.length() < 1 ) {
        System.out.print("[client] File:  ");
        file = stdin.readLine();
      }
  
      while( null == path || path.length() < 1 ) {
        System.out.print("[client] Path:  ");
        path = stdin.readLine();
      }
  
      // ask for the version if appropriate...
      if( 0 == action.compareTo("get") 
       || 0 == action.compareTo("checkout")
       || 0 == action.compareTo("checkin") ) {
        if( null == version ) {
          System.out.print("[client] Version [enter for latest]:  ");
          version = stdin.readLine();
          version = version.length() < 1 ? null : version;
        }
      }
      
      // if( actions.containsKey
    }
    catch( IOException ioe ) {
      System.out.println("[client] Error reading from standard in.");
      System.out.println("[client] Unable to obtain needed information, aborting.");
      if( debug ) {
        System.out.println(ioe);
      }
    }

    if( debug ) {
      System.out.println("[client] Action:        " + action );
      System.out.println("[client] File:          " + file );
      System.out.println("[client] Path:          " + path );
      System.out.println("[client] Version:       " + version );
      System.out.println("[client] User:          " + uname );
      System.out.println("[client] Password:      " + password );
      System.out.println("[client] [net_sccs] alt_conf    = " + alt_conf );
      System.out.println("[client] [net_sccs] show_help   = " + show_help );
    }

    URL net_sccs_server_url = null;
    try { // to create the serverr URL
      net_sccs_server_url = new URL("http://" + net_sccs_host + "/net_sccs/net_sccs.cgi");
    }
    catch( MalformedURLException mue ) {
      System.out.println("[client] Error creating URL object for communicating "
        + "with the net_sccs server.");
      if( debug ) {
        System.out.println(mue);
      }
      System.exit(1);
    }

    String http_request = null;
    String post_data = null;

    if( 0 == action.compareTo("add") || 0 == action.compareTo("checkin") ) {
      post_data  =    "action=" + URLEncoder.encode(action);
      if( debug ) {
        post_data +=  "&debug=true";
      }
      post_data +=    "&uname=" + URLEncoder.encode(uname);
      post_data +=    "&password=" + URLEncoder.encode(password);
      post_data +=    "&file_name=" + URLEncoder.encode(file);
      post_data +=    "&path=" + URLEncoder.encode(path);
      post_data +=    "&file=";
      if( null != comment ) {
        post_data +=  "&comment=" + URLEncoder.encode(comment);
      }
      post_data +=    get_post_data(file);
      http_request  = "POST /cgi-bin/net_sccs/net_sccs.cgi HTTP/1.0\n";
      http_request += "Content-type: application/x-www-form-urlencoded\n";
      http_request += "Content-length: " + post_data.length() + "\n";
      http_request += "\n";
    }
    else if( 0 == action.compareTo("get") || 0 == action.compareTo("checkout") ) {
      http_request  = "GET /cgi-bin/net_sccs/net_sccs.cgi?";
      http_request += "action=" + URLEncoder.encode(action);
      if( debug ) {
        post_data  +=  "&debug=true";
      }
      http_request += "&uname=" + URLEncoder.encode(uname);
      http_request += "&password=" + URLEncoder.encode(password);
      http_request += "&file_name=" + URLEncoder.encode(file);
      http_request += "&path=" + URLEncoder.encode(path);
      if( null != version ) {
        http_request += "&version=" + URLEncoder.encode(version);
      }
      http_request += "\n";
    }
    else {
      System.out.println("[client] Error, don't know how to perform action: " + action );
      System.exit(1);
    }

    if( debug ) {
      System.out.println("[client] Request is: " + http_request );
      System.out.flush();
    }

    try { // to create a socket, send the request, and get the reply...
      String host = net_sccs_server_url.getHost();
      int port = net_sccs_server_url.getPort();
      port = -1 == port ? 80 : port;
      Socket socket = new Socket(host,port);
      BufferedReader from_server = null;
      from_server = new BufferedReader( new InputStreamReader( socket.getInputStream() ) );
      PrintWriter to_server = new PrintWriter(new OutputStreamWriter(socket.getOutputStream()));

      to_server.print(http_request);
      if( null != post_data ) {
        if( debug ) {
          System.out.println("[client] Sending post data, length " + post_data.length() );
        }
        to_server.print(post_data);
      }
      to_server.flush();

      String line = new String();
      System.out.println("[client] Server Reply:");
      PrintWriter to_file = null;
      while( true ) {
        line = from_server.readLine();
	if( null == line ) {
	  break;
	}
	if( 0 == line.compareTo(file_begin_string) ) {
	  to_file = new PrintWriter( new FileOutputStream(file) );
	  if( debug ) {
	    System.out.println("[client] Opened file: " + file + " for writing.");
	  }

	  while( true ) {
	    line = from_server.readLine();
	    if( null == line ) {
	      break;
	    }
	    if( 0 == line.compareTo(file_end_string) ) {
	      if( debug ) {
	        System.out.println("[client] received file, closing local file.");
	      }
              to_file.close();
	      break;
	    }
	    // write it to the file...
	    to_file.println(line);
	  }
	  continue;
	}
        System.out.println( line );
      }
      System.out.println();
      socket.close();
    }
    catch( IOException ioe ) {
      System.out.println("[client] Error communicating with host, or writing to local file.");
      if( debug ) {
        System.out.println(ioe);
      }
    }
  }

  public String get_post_data( String file ) {
    String post_data = null;
    byte data[] = new byte[def_buff_len];
    int bytes = 0;
    try { // to read the local file into a string...
      post_data = new String();
      FileInputStream from_file = new FileInputStream(file);
      while( true ) {
        bytes = from_file.read(data);
        if( 0 == bytes ) {
          continue;
        }

        if( -1 == bytes ) {
          break;
        }

        post_data += URLEncoder.encode( new String(data,0,bytes) );
      }
      from_file.close();
    }
    catch( FileNotFoundException fnfe ) {
      System.out.println("[client] Error reading from file: " + file);
      System.out.println("[client] File not found.");
      if( debug ) {
        System.out.println(fnfe);
      }
    }
    catch( IOException ioe ) {
      System.out.println("[client] Error reading from file: " + file );
      if( debug ) {
        System.out.println(ioe);
      }
    }
    return post_data;
  }

  public boolean create_config_from_user() {
    System.out.print("[client] Would you like to create one? (y/n): ");
    String config_file = null, net_sccs_host = null, language = null;
    String user_name = null, default_path = null;
    BufferedWriter br_conf = null;

    try { // to get settings from the user...
      String response = stdin.readLine();
      if( null == response || 0 == response.compareTo("n") ) {
        return false;
      }

      System.out.println("[client] There are three (default) places where net_sccs looks for ");
      System.out.println("[client] it's configuration files.  They are:");
      System.out.println("  " + conf_home );
      System.out.println("  ./.net_sccs");
      System.out.println("  file://C|/.net_sccs");
      System.out.print("[client] Where should net_sccs store it's configuration? ["
        + conf_home + "]: ");
      config_file = stdin.readLine();
      if( null == config_file || config_file.length() < 1 ) 
        config_file = conf_home;

      try { // to open the file, and create a BufferedReader from it...
        br_conf = new BufferedWriter( new FileWriter(config_file) );
      }
      catch( IOException ioe ) {
        System.out.println("[client] Error opening file : "
          + config_file );
        System.exit(1);
      }

      while( null == net_sccs_host ) {
        System.out.print("[client] Please Enter the Default net_sccs host [none]:  ");
        net_sccs_host = stdin.readLine();
      }

      String def_uname = System.getProperty("user.name");
      if( null == def_uname ) def_uname = "none";
      System.out.print("[client] Default Username [" + def_uname + "]:  ");
      user_name = stdin.readLine();
      if( null == user_name || user_name.length() < 1 ) user_name = def_uname;
      System.out.println("[client] Using username: " + user_name );

      System.out.print("[client] What language would you preferr? [english]:  ");
      language = stdin.readLine();
      if( null == language || language.length() < 1 ) language = "english";
      System.out.println("[client] Using language: " + language );

      System.out.print("[client] Default path [/]:  ");
      default_path = stdin.readLine();
      if( null == default_path || default_path.length() < 1 ) default_path = "/";
    }
    catch( IOException ioe ) {
      System.out.println("[client] Error reading from stdin.");
      if( debug ) {
        System.out.println(ioe);
      }
    }

    try { // to write the settings to the config file...
      String tmp = new String();
      tmp = "# net_sccs configuration file -- autocreated on: ";
      Date now = new Date();
      tmp += (new java.util.Date()).toString();
      br_conf.write( tmp, 0, tmp.length() );
      br_conf.newLine();
      tmp = "#";
      br_conf.write( tmp, 0, tmp.length() );
      br_conf.newLine();
      tmp = "language		" + language;
      br_conf.write( tmp, 0, tmp.length() );
      br_conf.newLine();
      tmp = "net_sccs_host		" + net_sccs_host;
      br_conf.write( tmp, 0, tmp.length() );
      br_conf.newLine();
      tmp = "default_user		" + user_name;
      br_conf.write( tmp, 0, tmp.length() );
      br_conf.newLine();
      tmp = "default_path		" + default_path;
      br_conf.write( tmp, 0, tmp.length() );
      br_conf.newLine();
      // also use a password?
      br_conf.close();
    }
    catch( IOException ioe ) {
      System.out.println("[client] Error writing to conf file: "
        + config_file );
      return false;
    }

    return true;
  }

  public boolean configure() {
    BufferedReader br_conf = null;
    if( null != alt_conf ) {
      if( debug ) {
        System.out.println("[client] trying alternate config file: " + alt_conf );
      }

      try { // to open the alternative configuration file...
        br_conf = new BufferedReader( new FileReader(alt_conf) );
        return read_config_info( br_conf );
      }
      catch( IOException ioe ) {
        if( debug ) {
          System.out.println("[client] Error reading configuration information, "
            + "from alternate file.  File not found: " + alt_conf );
          System.out.println(ioe);
        }
      }
    }

// this isn't implemented yet...
if(false) {
    // try the environment variable...
    String host = java.lang.System.getProperty("NET_SCCS_HOST");

    if( debug ) {
      System.out.println("[client] trying env var: NET_SCCS_HOST" );
    }


    if( null != host ) {
      if( debug ) {
        System.out.println("[client] trying to get config info from: " 
          + host );
      }

      try { // to read the config from the url specified in the environment variable...
        return read_config_info( br_conf );
      }
      catch( IOException ioe ) {
        System.out.println("[client] error retreiving config file.");
        if( debug ) {
          System.out.println(ioe);
        }
        return false;
      }
    }
}

    // try for a file in their home dir...
    if( debug ) {
      System.out.println("[client] trying file: " + conf_home );
    }

    try {
      br_conf = new BufferedReader( new FileReader(conf_home) );
      conf_use = conf_home;
      return read_config_info(br_conf);
    }
    catch( IOException ioe ) {
      if( debug ) {
        System.out.println("[client] Error reading configuration information, "
          + "from file.  File not found: " + conf_pwd );
        System.out.println(ioe);
      }
    }

    // try for a file in the current dir...
    if( debug ) {
      System.out.println("[client] trying file: " + conf_pwd );
    }

    try {
      br_conf = new BufferedReader( new FileReader(conf_pwd) );
      conf_use = conf_pwd;
      return read_config_info(br_conf);
    }
    catch( IOException ioe ) {
      if( debug ) {
        System.out.println("[client] Error reading configuration information, "
          + "from file.  File not found: " + conf_pwd );
        System.out.println(ioe);
      }
    }

    // try for a file at the specified URL...
    if( debug ) {
      System.out.println("[client] trying file: " + conf_win );
    }

    try {
      br_conf = new BufferedReader( new FileReader(conf_win) );
      return read_config_info(br_conf);
    }
    catch( IOException ioe ) {
      if( debug ) {
        System.out.println("[client] Error reading configuration information, "
          + "from file.  File not found: " + conf_pwd );
        System.out.println(ioe);
      }
    }

    // not found...no config file present
    return false;
  }

  public boolean read_config_info( BufferedReader br_conf ) throws IOException {
    net_msgs conf = new net_msgs();
    if( !conf.init(br_conf) ) {
      System.out.println("[client] Error reading from config file.");
      return false;
    }

    if( conf.containsKey("language") )         language       = conf.get("language");
    if( conf.containsKey("net_sccs_host") )    net_sccs_host  = conf.get("net_sccs_host");
    if( conf.containsKey("default_user") )     uname          = conf.get("default_user");
    if( conf.containsKey("default_password") ) password       = conf.get("default_password");

    try {
      msgs = new net_msgs("http://" + net_sccs_host + "/net_sccs/msgs/" + language 
                      + "net_sccs.strings.txt");
      if( debug ) {
        System.out.println("[client] read message file.");
      }
    }
    catch( MalformedURLException mue ) {
      System.out.println("[client] Error retreiving message file.");
      if( debug ) {
        System.out.println(mue);
      }
      System.out.println("[client] Unable to continue.");
      System.exit(1);
    }
    catch( IOException ioe ) {
      System.out.println("[client] Error retreiving message file.");
      if( debug ) {
        System.out.println(ioe);
      }
      System.out.println("[client] Unable to continue.");
      System.exit(1);
    }

    return true;
  }
}