/* -*- Mode: java; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 *
 * The contents of this file are subject to the Mozilla Public
 * License Version 1.1 (the "License"); you may not use this file
 * except in compliance with the License. You may obtain a copy of
 * the License at http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS
 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * rights and limitations under the License.
 *
 * The Original Code is the Grendel mail/news client.
 *
 * The Initial Developer of the Original Code is Netscape Communications
 * Corporation.  Portions created by Netscape are
 * Copyright (C) 1997 Netscape Communications Corporation. All
 * Rights Reserved.
 *
 * Contributor(s): 
 *
 * Created: Jamie Zawinski <jwz@netscape.com>, 28 Aug 1997.
 */

package grendel.mime.html;

import grendel.mime.IMimeObject;
import grendel.mime.IMimeOperator;
import calypso.util.ByteBuf;
import javax.mail.internet.InternetHeaders;
import java.io.PrintStream;

/** This class converts the message/external-body  MIME type to HTML
    that points at the remote document.
 */

class MimeExternalBodyOperator extends MimeExternalObjectOperator {

  InternetHeaders body_headers;
  MimeExternalBodyBody body;

  MimeExternalBodyOperator(IMimeObject object, PrintStream out) {
    super(object, out);
    body_headers = new InternetHeaders();
  }

  void writeBoxEarly() {}       // we need to wait for EOF to write the box.

  public void pushBytes(ByteBuf b) {
    throw new Error("containers don't get bytes");
  }

  public IMimeOperator createChild(IMimeObject child) {
    // Children of message/external-body are always operators of this type.
    // The parent and child types know about each other.
    body = new MimeExternalBodyBody(child, getOut());
    return body;
  }

  private String getHeaderValue(String name, InternetHeaders ih,
                                boolean strip) {
    String hh[] = ih.getHeader(name);
    if (hh == null || hh.length == 0)
      return null;
    String v = hh[0];
    // #### handle strip
    return v;
  }

  void make_header(String param_name, String header_value,
                   InternetHeaders input_headers,
                   InternetHeaders output_headers) {
    ByteBuf scratch = new ByteBuf();
//####
//    ByteBuf bb = new ByteBuf(header_value);
//    if (input_headers.getParameter(bb, param_name, scratch)) {
//
//      // Kludge for URLs...  if this is a URL parameter, remove all whitespace
//      // from it. (The URL parameter to one of these headers is stored with
//      // lines broken every 40 characters or less; it's assumed that all
//      // significant whitespace was URL-hex-encoded, and all the rest of it
//      // was inserted just to keep the lines short.)
//      if (param_name.equalsIgnoreCase("URL")) {
//        int i = 0;
//        while (i < scratch.length()) {
//          if ((scratch.toBytes())[i] <= ' ')
//            scratch.remove(i, i+1);
//          else
//            i++;
//        }
//      }
//
//      scratch.insert(0, param_name + ": ");
//      output_headers.addLine(scratch);
//    }
  }

  public void pushEOF() {

    ByteBuf line = new ByteBuf();

    // silly constructed headers used for display purposes
    InternetHeaders dpy_headers = new InternetHeaders();

    // the *outer* content-type (message/external-body with parameters.)
    String ct = getHeaderValue("Content-Type", headers, false);

    make_header("Access-Type", ct, headers, dpy_headers);
    make_header("URL",         ct, headers, dpy_headers);
    make_header("Site",        ct, headers, dpy_headers);
    make_header("Server",      ct, headers, dpy_headers);
    make_header("Directory",   ct, headers, dpy_headers);
    make_header("Name",        ct, headers, dpy_headers);

    // the *inner* content-type
    if (body != null &&
        body.headers != null) {
      String ict = getHeaderValue("Content-Type", body.headers, true);
      if (ict != null) {
        line.insert(0, "Type: ");
        dpy_headers.addHeaderLine(ict);
      }
    }

    make_header("Size",        ct, headers, dpy_headers);
    make_header("Expiration",  ct, headers, dpy_headers);
    make_header("Permission",  ct, headers, dpy_headers);
    make_header("Mode",        ct, headers, dpy_headers);
    make_header("Subject",     ct, headers, dpy_headers);

    String body_str = (body != null && body.buffer != null
                       ? body.buffer.toString()
                       : null);
    if (body_str != null) {
      body_str = body_str.trim();
      if (body_str.length() == 0)
        body_str = null;
    }

    String url = makeURL(dpy_headers, body_str);
    String lname = (url == null
                    ? "Document Info"           // #### I18N
                    : "Link to Document");      // #### I18N

    formatAttachmentBox(dpy_headers, null, lname, url, body_str, true);
    dpy_headers = null;
    body = null;
  }

  String makeURL(InternetHeaders headers, String body) {
    String at = getHeaderValue("Access-Type", headers, true);
    if (at == null)
      return null;
    else if (at.equalsIgnoreCase("ftp") || at.equalsIgnoreCase("anon-ftp")) {
      String site = getHeaderValue("Site", headers, true);
      String dir  = getHeaderValue("Directory", headers, true);
      String name = getHeaderValue("name", headers, true);
      if (site == null)
        return null;
      else {
        String result = "ftp://" + site + "/";
        if (dir != null) {
          if (dir.charAt(0) == '/')
            dir = dir.substring(1);
          result += dir;
          if (result.charAt(result.length() - 1) != '/')
            result += "/";
        }
        if (name != null)
          result += name;
        return result;
      }
    }

    else if (at.equalsIgnoreCase("local-file") || at.equalsIgnoreCase("afs")) {
      String name = getHeaderValue("Name", headers, true);
      if (name == null)
        return null;
      // name = NET_Escape(name, URL_PATH); // ####
      return "file:" + name;
    }

    else if (at.equalsIgnoreCase("mail-server")) {
      String server  = getHeaderValue("Server", headers, true);
      String subject = getHeaderValue("Subject", headers, false);

      if (server == null)
        return null;
      // server = NET_Escape(server, URL_XALPHAS);    // ####
      // subject = NET_Escape(subject, URL_XALPHAS);  // ####
      // body = NET_Escape(body, URL_XALPHAS);        // ####

      String result = "mailto:" + server;
      if (subject != null)
        result += "?subject=" + subject;
      if (body != null) {
        if (subject != null)
          result += "&";
        else
          result += "?";
        result += "body=" + body;
      }
      return result;
    }

    else if (at.equalsIgnoreCase("url")) {          // RFC 2017
      return getHeaderValue("URL", headers, false);
    }

    else
      return null;
  }
}


class MimeExternalBodyBody extends MimeTextOperator {

  MimeExternalBodyBody(IMimeObject object, PrintStream out) {
    super(object, out);
  }

  public void pushBytes(ByteBuf b) {
    // Store decoded bytes in the `buffer' StringBuffer.
    // Store the whole body there.
    decodeBytesToUnicode(b, buffer);
  }

  public void pushEOF() {
  }
}