/*
 *
 *  D-Bus++ - C++ bindings for D-Bus
 *
 *  Copyright (C) 2005-2007  Paolo Durante <shackan@gmail.com>
 *
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2.1 of the License, or (at your option) any later version.
 *
 *  This library 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
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

#include <iostream>
#include <fstream>
#include <cstdlib>
#include <algorithm>

#include "generator_utils.h"
#include "generate_proxy.h"

using namespace std;
using namespace DBus;

extern const char *tab;
extern const char *header;
extern const char *dbus_includes;

/*! Generate proxy code for a XML introspection
  */
void generate_proxy(Xml::Document &doc, const char *filename)
{
  ostringstream body;
  ostringstream head;
  vector <string> include_vector;

  head << header;
  string filestring = filename;
  underscorize(filestring);

  string cond_comp = "__dbusxx__" + filestring + "__PROXY_MARSHAL_H";

  head << "#ifndef " << cond_comp << endl
       << "#define " << cond_comp << endl;

  head << dbus_includes;

  Xml::Node &root = *(doc.root);
  Xml::Nodes interfaces = root["interface"];

  // iterate over all interface definitions
  for (Xml::Nodes::iterator i = interfaces.begin(); i != interfaces.end(); ++i)
  {
    Xml::Node &iface = **i;
    Xml::Nodes methods = iface["method"];
    Xml::Nodes signals = iface["signal"];
    Xml::Nodes properties = iface["property"];
    Xml::Nodes ms;
    ms.insert(ms.end(), methods.begin(), methods.end());
    ms.insert(ms.end(), signals.begin(), signals.end());

    // gets the name of a interface: <interface name="XYZ">
    string ifacename = iface.get("name");

    // these interface names are skipped.
    if (ifacename == "org.freedesktop.DBus.Introspectable"
        || ifacename == "org.freedesktop.DBus.Properties")
    {
      cerr << "skipping interface " << ifacename << endl;
      continue;
    }

    istringstream ss(ifacename);
    string nspace;
    unsigned int nspaces = 0;

    // prints all the namespaces defined with <interface name="X.Y.Z">
    while (ss.str().find('.', ss.tellg()) != string::npos)
    {
      getline(ss, nspace, '.');

      body << "namespace " << nspace << " {" << endl;

      ++nspaces;
    }
    body << endl;

    string ifaceclass;

    getline(ss, ifaceclass);

    // a "_proxy" is added to class name to distinguish between proxy and adaptor
    ifaceclass += "_proxy";

    cerr << "generating code for interface " << ifacename << "..." << endl;

    // the code from class definiton up to opening of the constructor is generated...
    body << "class " << ifaceclass << endl
         << ": public ::DBus::InterfaceProxy" << endl
         << "{" << endl
         << "public:" << endl
         << endl
         << tab << ifaceclass << "()" << endl
         << tab << ": ::DBus::InterfaceProxy(\"" << ifacename << "\")" << endl
         << tab << "{" << endl;

    // generates code to connect all the signal stubs; this is still inside the constructor
    for (Xml::Nodes::iterator si = signals.begin(); si != signals.end(); ++si)
    {
      Xml::Node &signal = **si;

      string marshname = "_" + signal.get("name") + "_stub";

      body << tab << tab << "connect_signal("
           << ifaceclass << ", " << signal.get("name") << ", " << stub_name(signal.get("name"))
           << ");" << endl;
    }

    // the constructor ends here
    body << tab << "}" << endl
         << endl;

    // write public block header for properties
    body << "public:" << endl << endl
         << tab << "/* properties exported by this interface */" << endl;

    // this loop generates all properties
    for (Xml::Nodes::iterator pi = properties.begin();
         pi != properties.end(); ++pi)
    {
      Xml::Node &property = **pi;
      string prop_name = property.get("name");
      string property_access = property.get("access");
      if (property_access == "read" || property_access == "readwrite")
      {
        body << tab << tab << "const " << signature_to_type(property.get("type"))
             << " " << prop_name << "() {" << endl;
        body << tab << tab << tab << "::DBus::CallMessage call ;\n ";
        body << tab << tab << tab
             << "call.member(\"Get\"); call.interface(\"org.freedesktop.DBus.Properties\");"
             << endl;
        body << tab << tab << tab
             << "::DBus::MessageIter wi = call.writer(); " << endl;
        body << tab << tab << tab
             << "const std::string interface_name = \"" << ifacename << "\";"
             << endl;
        body << tab << tab << tab
             << "const std::string property_name  = \"" << prop_name << "\";"
             << endl;
        body << tab << tab << tab << "wi << interface_name;" << endl;
        body << tab << tab << tab << "wi << property_name;" << endl;
        body << tab << tab << tab
             << "::DBus::Message ret = this->invoke_method (call);" << endl;
        // TODO: support invoke_method_NoReply for properties
        body << tab << tab << tab
             << "::DBus::MessageIter ri = ret.reader ();" << endl;
        body << tab << tab << tab << "::DBus::Variant argout; " << endl;
        body << tab << tab << tab << "ri >> argout;" << endl;
        body << tab << tab << tab << "return argout;" << endl;
        body << tab << tab << "};" << endl;
      }

      if (property_access == "write" || property_access == "readwrite")
      {
        body << tab << tab << "void " << prop_name << "( const " << signature_to_type(property.get("type")) << " & input" << ") {" << endl;
        body << tab << tab << tab << "::DBus::CallMessage call ;\n ";
        body << tab << tab << tab << "call.member(\"Set\");  call.interface( \"org.freedesktop.DBus.Properties\");" << endl;
        body << tab << tab << tab << "::DBus::MessageIter wi = call.writer(); " << endl;
        body << tab << tab << tab << "::DBus::Variant value;" << endl;
        body << tab << tab << tab << "::DBus::MessageIter vi = value.writer ();" << endl;
        body << tab << tab << tab << "vi << input;" << endl;
        body << tab << tab << tab << "const std::string interface_name = \"" << ifacename << "\";" << endl;
        body << tab << tab << tab << "const std::string property_name  = \"" << prop_name << "\";" << endl;
        body << tab << tab << tab << "wi << interface_name;" << endl;
        body << tab << tab << tab << "wi << property_name;" << endl;
        body << tab << tab << tab << "wi << value;" << endl;
        body << tab << tab << tab << "::DBus::Message ret = this->invoke_method (call);" << endl;
        // TODO: support invoke_method_noreply for properties
        body << tab << tab << "};" << endl;
      }
    }

    // write public block header for methods
    body << "public:" << endl
         << endl
         << tab << "/* methods exported by this interface," << endl
         << tab << " * this functions will invoke the corresponding methods on the remote objects" << endl
         << tab << " */" << endl;

    // this loop generates all methods
    for (Xml::Nodes::iterator mi = methods.begin(); mi != methods.end(); ++mi)
    {
      Xml::Node &method = **mi;
      Xml::Nodes args = method["arg"];
      Xml::Nodes args_in = args.select("direction", "in");
      Xml::Nodes args_out = args.select("direction", "out");
      Xml::Nodes annotations = args["annotation"];
      Xml::Nodes method_annotations = method["annotation"];
      Xml::Nodes annotations_noreply = method_annotations.select("name", "org.freedesktop.DBus.Method.NoReply");
      Xml::Nodes annotations_object = annotations.select("name", "org.freedesktop.DBus.Object");
      string arg_object;
      bool annotation_noreply_value = false;

      // parse method level noreply annotations
      if (!annotations_noreply.empty())
      {
        string annotation_noreply_value_str = annotations_noreply.front()->get("value");

        if (annotation_noreply_value_str == "true")
        {
          annotation_noreply_value = true;
        }
      }

      if (!annotations_object.empty())
      {
        arg_object = annotations_object.front()->get("value");
      }

      if (args_out.size() == 0 || args_out.size() > 1)
      {
        body << tab << "void ";
      }
      else if (args_out.size() == 1)
      {
        if (arg_object.length())
        {
          body << tab << arg_object << " ";
        }
        else
        {
          body << tab << signature_to_type(args_out.front()->get("type")) << " ";
        }
      }

      body << method.get("name") << "(";

      // generate all 'in' arguments for a method signature
      unsigned int i = 0;
      for (Xml::Nodes::iterator ai = args_in.begin(); ai != args_in.end(); ++ai, ++i)
      {
        Xml::Node &arg = **ai;
        Xml::Nodes annotations = arg["annotation"];
        Xml::Nodes annotations_object = annotations.select("name", "org.freedesktop.DBus.Object");
        string arg_object;

        if (!annotations_object.empty())
        {
          arg_object = annotations_object.front()->get("value");
        }

        // generate basic signature only if no object name available...
        if (!arg_object.length())
        {
          body << "const " << signature_to_type(arg.get("type")) << "& ";
        }
        // ...or generate object style if available
        else
        {
          body << "const " << arg_object << "& ";

          // store a object name to later generate header includes
          include_vector.push_back(arg_object);
        }

        string arg_name = arg.get("name");
        if (arg_name.length())
          body << arg_name;
        else
          body << "argin" << i;

        if ((i + 1 != args_in.size() || args_out.size() > 1))
          body << ", ";
      }

      if (args_out.size() > 1)
      {
        // generate all 'out' arguments for a method signature
        unsigned int j = 0;
        for (Xml::Nodes::iterator ao = args_out.begin(); ao != args_out.end(); ++ao, ++j)
        {
          Xml::Node &arg = **ao;
          Xml::Nodes annotations = arg["annotation"];
          Xml::Nodes annotations_object = annotations.select("name", "org.freedesktop.DBus.Object");
          string arg_object;

          if (!annotations_object.empty())
          {
            arg_object = annotations_object.front()->get("value");
          }

          // generate basic signature only if no object name available...
          if (!arg_object.length())
          {
            body << signature_to_type(arg.get("type")) << "&";
          }
          // ...or generate object style if available
          else
          {
            body << arg_object << "& ";

            // store a object name to later generate header includes
            include_vector.push_back(arg_object);
          }

          string arg_name = arg.get("name");
          if (arg_name.length())
            body << " " << arg_name;
          else
            body << " argout" << j;

          if (j + 1 != args_out.size())
            body << ", ";
        }
      }
      body << ")" << endl;

      body << tab << "{" << endl
           << tab << tab << "::DBus::CallMessage call;" << endl;

      if (!args_in.empty())
      {
        body << tab << tab << "::DBus::MessageIter wi = call.writer();" << endl
             << endl;
      }

      // generate all 'in' arguments for a method body
      i = 0;
      for (Xml::Nodes::iterator ai = args_in.begin(); ai != args_in.end(); ++ai, ++i)
      {
        Xml::Node &arg = **ai;
        string arg_name = arg.get("name");
        Xml::Nodes annotations = arg["annotation"];
        Xml::Nodes annotations_object = annotations.select("name", "org.freedesktop.DBus.Object");
        string arg_object;

        if (!annotations_object.empty())
        {
          arg_object = annotations_object.front()->get("value");
        }

        if (!arg_name.length())
        {
          arg_name = "argin";
          arg_name += toString <uint> (i);
        }

        // generate extra code to wrap object
        if (arg_object.length())
        {
          body << tab << tab << signature_to_type(arg.get("type")) << "_" << arg_name << ";" << endl;
          body << tab << tab << "_" << arg_name << " << " << arg_name << ";" << endl;

          arg_name = string("_") + arg_name;
        }

        body << tab << tab << "wi << " << arg_name << ";" << endl;
      }

      body << tab << tab << "call.member(\"" << method.get("name") << "\");" << endl;

      // generate noreply/reply method calls
      if (annotation_noreply_value)
      {
        if (args_out.size())
        {
          cerr << "Function: " << method.get("name") << ":" << endl;
          cerr << "Option 'org.freedesktop.DBus.Method.NoReply' not allowed for methods with 'out' variables!" << endl << "-> Option ignored!" << endl;

          body << tab << tab << "::DBus::Message ret = invoke_method (call);" << endl;
        }
        else
        {
          body << tab << tab << "assert (invoke_method_noreply (call));" << endl; // will only assert in case of no memory
        }
      }
      else
      {
        body << tab << tab << "::DBus::Message ret = invoke_method (call);" << endl;
      }

      if (!args_out.empty())
      {
        body << tab << tab << "::DBus::MessageIter ri = ret.reader();" << endl
             << endl;
      }

      // generate 'out' values as return if only one existing
      if (args_out.size() == 1)
      {
        Xml::Nodes annotations = args_out["annotation"];
        Xml::Nodes annotations_object = annotations.select("name", "org.freedesktop.DBus.Object");
        string arg_object;

        if (!annotations_object.empty())
        {
          arg_object = annotations_object.front()->get("value");
        }

        if (arg_object.length())
        {
          body << tab << tab << arg_object << " _argout;" << endl;
        }

        body << tab << tab << signature_to_type(args_out.front()->get("type")) << " argout;" << endl;

        body << tab << tab << "ri >> argout;" << endl;

        if (arg_object.length())
        {
          body << tab << tab <<  "_argout << argout;" << endl;
          body << tab << tab << "return _argout;" << endl;
        }
        else
        {
          body << tab << tab << "return argout;" << endl;
        }
      }
      else if (args_out.size() > 1)
      {
        // generate multible 'out' value
        unsigned int i = 0;
        for (Xml::Nodes::iterator ao = args_out.begin(); ao != args_out.end(); ++ao, ++i)
        {
          Xml::Node &arg = **ao;
          string arg_name = arg.get("name");
          Xml::Nodes annotations = arg["annotation"];
          Xml::Nodes annotations_object = annotations.select("name", "org.freedesktop.DBus.Object");
          string arg_object;

          if (!annotations_object.empty())
          {
            arg_object = annotations_object.front()->get("value");
          }

          if (!arg_name.length())
          {
            arg_name = "argout" + toString <uint> (i);
          }

          if (arg_object.length())
          {
            body << tab << tab << signature_to_type(arg.get("type")) << "_" << arg_name << ";" << endl;
          }

          if (arg_object.length())
          {
            body << tab << tab << "ri >> " << "_" << arg_name << ";" << endl;
          }
          else
          {
            body << tab << tab << "ri >> " << arg_name << ";" << endl;
          }

          if (arg_object.length())
          {
            body << tab << tab << arg_name << " << " << "_" << arg_name << ";" << endl;
          }
        }
      }

      body << tab << "}" << endl
           << endl;
    }

    // write public block header for signals
    body << endl
         << "public:" << endl
         << endl
         << tab << "/* signal handlers for this interface" << endl
         << tab << " */" << endl;

    // this loop generates all signals
    for (Xml::Nodes::iterator si = signals.begin(); si != signals.end(); ++si)
    {
      Xml::Node &signal = **si;
      Xml::Nodes args = signal["arg"];

      body << tab << "virtual void " << signal.get("name") << "(";

      // this loop generates all argument for a signal
      unsigned int i = 0;
      for (Xml::Nodes::iterator ai = args.begin(); ai != args.end(); ++ai, ++i)
      {
        Xml::Node &arg = **ai;
        string arg_name = arg.get("name");
        Xml::Nodes annotations = arg["annotation"];
        Xml::Nodes annotations_object = annotations.select("name", "org.freedesktop.DBus.Object");
        string arg_object;

        if (!annotations_object.empty())
        {
          arg_object = annotations_object.front()->get("value");
        }

        // generate basic signature only if no object name available...
        if (!arg_object.length())
        {
          body << "const " << signature_to_type(arg.get("type")) << "& ";
        }
        // ...or generate object style if available
        else
        {
          body << "const " << arg_object << "& ";

          // store a object name to later generate header includes
          include_vector.push_back(arg_object);
        }

        if (arg_name.length())
          body << arg_name;
        else
          body << "argin" << i;

        if ((ai + 1 != args.end()))
          body << ", ";
      }
      body << ") = 0;" << endl;
    }

    // write private block header for unmarshalers
    body << endl
         << "private:" << endl
         << endl
         << tab << "/* unmarshalers (to unpack the DBus message before calling the actual signal handler)" << endl
         << tab << " */" << endl;

    // generate all the unmarshalers
    for (Xml::Nodes::iterator si = signals.begin(); si != signals.end(); ++si)
    {
      Xml::Node &signal = **si;
      Xml::Nodes args = signal["arg"];

      body << tab << "void " << stub_name(signal.get("name")) << "(const ::DBus::SignalMessage &sig)" << endl
           << tab << "{" << endl;

      if (!args.empty())
      {
        body << tab << tab << "::DBus::MessageIter ri = sig.reader();" << endl
             << endl;
      }

      unsigned int i = 0;
      for (Xml::Nodes::iterator ai = args.begin(); ai != args.end(); ++ai, ++i)
      {
        Xml::Node &arg = **ai;
        string arg_name = arg.get("name");
        Xml::Nodes annotations = arg["annotation"];
        Xml::Nodes annotations_object = annotations.select("name", "org.freedesktop.DBus.Object");
        string arg_object;

        if (!annotations_object.empty())
        {
          arg_object = annotations_object.front()->get("value");
        }

        body << tab << tab << signature_to_type(arg.get("type")) << " " ;

        // use a default if no arg name given
        if (!arg_name.length())
        {
          arg_name = "arg" + toString <uint> (i);
        }

        body << arg_name << ";" << endl;
        body << tab << tab << "ri >> " << arg_name << ";" << endl;

        // if a object type is used create a local variable and insert values with '<<' operation
        if (arg_object.length())
        {
          body << tab << tab << arg_object << " _" << arg_name << ";" << endl;
          body << tab << tab << "_" << arg_name << " << " << arg_name << ";" << endl;

          // store a object name to later generate header includes
          include_vector.push_back(arg_object);
        }
      }

      body << tab << tab << signal.get("name") << "(";

      // generate all arguments for the call to the virtual function
      unsigned int j = 0;
      for (Xml::Nodes::iterator ai = args.begin(); ai != args.end(); ++ai, ++j)
      {
        Xml::Node &arg = **ai;
        string arg_name = arg.get("name");
        Xml::Nodes annotations = arg["annotation"];
        Xml::Nodes annotations_object = annotations.select("name", "org.freedesktop.DBus.Object");
        string arg_object;

        if (!annotations_object.empty())
        {
          arg_object = annotations_object.front()->get("value");
        }

        if (!arg_name.length())
        {
          arg_name = "arg" + toString <uint> (j);
        }

        if (arg_object.length())
        {
          body << "_" << arg_name;
        }
        else
        {
          body << arg_name;
        }

        if (ai + 1 != args.end())
          body << ", ";
      }

      body << ");" << endl;

      body << tab << "}" << endl;
    }

    body << "};" << endl
         << endl;

    for (unsigned int i = 0; i < nspaces; ++i)
    {
      body << "} ";
    }
    body << endl;
  }

  body << "#endif //" << cond_comp << endl;

  // remove all duplicates in the header include vector
  vector<string>::const_iterator vec_end_it = unique(include_vector.begin(), include_vector.end());

  for (vector<string>::const_iterator vec_it = include_vector.begin();
       vec_it != vec_end_it;
       ++vec_it)
  {
    const string &include = *vec_it;

    head << "#include " << "\"" << include << ".h" << "\"" << endl;
  }
  head << endl;

  ofstream file(filename);
  if (file.bad())
  {
    cerr << "unable to write file " << filename << endl;
    exit(-1);
  }

  file << head.str();
  file << body.str();

  file.close();
}
