// ---------------------------------------------------------------------------
// - XmlContent.cpp                                                          -
// - afnix:xpe module - xml content class implementation                     -
// ---------------------------------------------------------------------------
// - This program is free software;  you can redistribute it  and/or  modify -
// - it provided that this copyright notice is kept intact.                  -
// -                                                                         -
// - 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.  In no event shall -
// - the copyright holder be liable for any  direct, indirect, incidental or -
// - special damages arising in any way out of the use of this software.     -
// ---------------------------------------------------------------------------
// - copyright (c) 1999-2008 amaury darsch                                   -
// ---------------------------------------------------------------------------

#include "Uri.hpp"
#include "Runnable.hpp"
#include "InputFile.hpp"
#include "TcpClient.hpp"
#include "QuarkZone.hpp"
#include "Exception.hpp"
#include "XmlContent.hpp"
#include "HttpRequest.hpp"
#include "HttpResponse.hpp"

namespace afnix {

  // -------------------------------------------------------------------------
  // - private section                                                       -
  // -------------------------------------------------------------------------

  // the uri file scheme
  static const String URI_FILE_SCHM = "file";
  // the uri http scheme
  static const String URI_HTTP_SCHM = "http";
  // the uri default path
  static const String URI_PATH_XDEF = "/";
  // the uri default port
  static const long   URI_PORT_XDEF = 80;

  // get an input file stream
  static Input* get_file_stream (const Uri& uri) {
    try {
      // get the system path from the uri path
      String path = uri.getsysp ();
      // open a file for input
      return new InputFile (path);
    } catch (...) {
      throw Exception ("file-error", "cannot access uri", uri.getname ());
    }
  }

  // get an input http stream
  static Input* get_http_stream (const Uri& uri) {
    // create a http request by uri
    HttpRequest hrq (uri);
    // get the uri host
    String host = uri.gethost ();
    // get the port
    long   port = uri.getport ();
    // open a tcp socket
    TcpClient* s = new TcpClient (host, port);
    // write the request
    hrq.write (*s);
    // create a response
    HttpResponse* hrs = new HttpResponse (s);
    try {
      // check for ok
      if (hrs->isok () == true) return hrs;
      // check for another location
      if (hrs->ishloc () == true) {
	Uri huri = hrs->gethloc ();
	delete hrs;
	return get_http_stream (huri);
      }
      // invalid response
      throw Exception ("http-error", "cannot access uri", uri.getname ());
    } catch (...) {
      delete hrs;
      throw;
    }
  }

  // get the content stream by uri name

  static Input* get_content_stream (const String& unam) {
    // create a uri by name
    Uri uri = unam;
    // get the uri scheme
    String sch = uri.getscheme ();
    // select from the uri scheme
    if (sch == URI_FILE_SCHM) return get_file_stream (uri);
    if (sch == URI_HTTP_SCHM) return get_http_stream (uri);
    // invalid uri scheme to process
    throw Exception ("scheme-error", "invalid xml content uri scheme", sch);
  }

  // -------------------------------------------------------------------------
  // - class section                                                         -
  // -------------------------------------------------------------------------

  // create a xml content by name

  XmlContent::XmlContent (const String& name) {
    // save the name
    d_name = name;
    // normalize the document name
    String unam = Uri::sysname (name);
    // get the input stream
    Input* is = get_content_stream (unam);
    // set the document root
    setroot (unam, is);
  }

  // create a xml content by name and document name

  XmlContent::XmlContent (const String& name, const String& docn) {
    // save the name
    d_name = name;
    // normalize the document name
    String unam = Uri::sysname (docn);
    // get the input stream
    Input* is = get_content_stream (unam);
    // set the document root
    setroot (unam, is);
  }

  // create a xml content by name, document name and encoding mode

  XmlContent::XmlContent (const String& name, const String& docn,
			  const String& emod) {
    // save the name
    d_name = name;
    // normalize the document name
    String unam = Uri::sysname (docn);
    // get the input stream
    Input* is = get_content_stream (unam);
    // set the encoding mode
    is->setemod (emod);
    // set the document root text
    setrtxt (unam, is);
  }

  // copy construct this content

  XmlContent::XmlContent (const XmlContent& that) : XmlDocument (that) {
    that.rdlock ();
    d_name = that.d_name;
    that.unlock ();
  }
    
  // get the content name

  String XmlContent::getname (void) const {
    rdlock ();
    String result = d_name;
    unlock ();
    return result;
  }

  // get the document name

  String XmlContent::getdocn (void) const {
    rdlock ();
    try {
      String result = XmlDocument::getname ();
      unlock ();
      return result;
    } catch(...) {
      unlock ();
      throw;
    }
  }

  // -------------------------------------------------------------------------
  // - object section                                                        -
  // -------------------------------------------------------------------------

  // the quark zone
  static const long QUARK_ZONE_LENGTH = 1;
  static QuarkZone  zone (QUARK_ZONE_LENGTH);

  // the object supported quarks
  static const long QUARK_GETDOCN = zone.intern ("get-document-name");

  // create a new object in a generic way

  Object* XmlContent::mknew (Vector* argv) {
    long argc = (argv == nilp) ? 0 : argv->length ();

    // check for 1 argument
    if (argc == 1) {
      String name = argv->getstring (0);
      return new XmlContent (name);
    }
    // wrong arguments
    throw Exception ("argument-error", 
		     "too many arguments with xml processor constructor");
  }

  // return true if the given quark is defined

  bool XmlContent::isquark (const long quark, const bool hflg) const {
    rdlock ();
    if (zone.exists (quark) == true) {
      unlock ();
      return true;
    }
    bool result = hflg ? XmlDocument::isquark (quark, hflg) : false;
    unlock ();
    return result;
  }

  // apply this object with a set of arguments and a quark

  Object* XmlContent::apply (Runnable* robj, Nameset* nset, const long quark,
			     Vector* argv) {
    // get the number of arguments
    long argc = (argv == nilp) ? 0 : argv->length ();
    
    // check for 0 argument
    if (argc == 0) {
      if (quark == QUARK_GETDOCN) return new String (getdocn ());
    }

    // call the xml document method
    return XmlDocument::apply (robj, nset, quark, argv);
  }
}
