/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set et sw=2 ts=2: */
/***************************************************************************
 *            transactionhandler.cc
 *
 *  Fri Dec 18 10:00:50 CET 2009
 *  Copyright 2009 Bent Bisballe Nyeng
 *  deva@aasimon.org
 ****************************************************************************/

/*
 *  This file is part of Pracro.
 *
 *  Pracro is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  Pracro 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 General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with Pracro; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA.
 */
#include "transactionhandler.h"

#include "macroparser.h"
#include "resumeparser.h"
#include "templateparser.h"
#include "configuration.h"
#include "luaquerymapper.h"
#include "queryhandlerpentominos.h"
#include "queryhandlerpracro.h"
#include "xml_encode_decode.h"
#include "widgetgenerator.h"
#include "journal.h"

static std::string error_box(std::string message)
{
  std::string errorbox =
    "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n"
    "<pracro version=\"1.0\">\n"
    "  <error>" + message + "</error>\n"
    "</pracro>\n";
  return errorbox;
}

static std::string handleCommits(Transaction &transaction, Environment &env,
                                 Session &session)
{
  std::string answer;

  if(transaction.commits.size() > 0) {
    AutoBorrower<Database*> borrower(env.dbpool);
    Database *db = borrower.get();
    //Database *db = session.database();

    Commits::iterator i = transaction.commits.begin();
    while(i != transaction.commits.end()) {
      Commit &commit = *i;
      
      MacroParser mp(env.macrolist.getLatestVersion(commit.macro));
      mp.parse();
      Macro *macro = mp.getMacro();
      
      std::string resume = resume_parser(*macro, commit);
      commit.fields["journal.resume"] = resume;
      session.isreadonly = false;
      db->commitTransaction(transaction, commit, *macro, session.id());

      if(resume != "") {
        
        TemplateParser tp(env.templatelist.getLatestVersion(commit.templ));
        tp.parse();
        Template *templ = tp.getTemplate();
        
        session.journal()->addEntry(transaction, commit, resume, templ);
      }
      
      i++;
    }
  }

  return answer;
}

static std::string handleRequest(Transaction &transaction, Environment &env,
                                 Session &session)
{
  std::string answer;

  if(transaction.requests.size() > 0) {

    AutoBorrower<Database*> borrower(env.dbpool);
    Database *db = borrower.get();
    //    Database *db = session.database();
    
    Requests::iterator i = transaction.requests.begin();
    while(i != transaction.requests.end()) {
      Request &request = *i;
    
      DEBUG(server, "Handling request - macro: %s, template: %s\n",
            request.macro.c_str(), request.templ.c_str());
    
      // Read and parse the template file.
      TemplateParser tp(env.templatelist.getLatestVersion(request.templ));
      tp.parse();
    
      Template *templ = tp.getTemplate();
    
      answer += "  <template name=\"";
      answer += templ->attributes["name"];
      answer += "\" title=\"";
      answer += templ->attributes["title"];
      answer += "\">\n";
    
      bool foundmacro = false;
    
      // Generate the macro and return it to the client
      std::vector< Macro >::iterator mi2 = templ->macros.begin();
      while(mi2 != templ->macros.end()) {
        Macro &macro = (*mi2);

        if(macro.isHeader) {
          answer += "    <header caption=\"" + macro.attributes["caption"] +
            "\"/>\n";
          mi2++;
          continue;
        }

        bool completed = db->checkMacro(transaction.cpr,
                                        macro.attributes["name"],
                                        session.id(),
                                        time(NULL)-Conf::db_max_ttl);

        answer += "    <macro uid=\"42\" completed=";
        if(completed) answer += "\"true\"";
        else answer += "\"false\"";

        std::map< std::string, std::string >::iterator ai =
          macro.attributes.begin();
        while(ai != macro.attributes.end()) {
          std::string name = ai->first;
          std::string value = ai->second;
          answer += " "+name+"=\"" + value + "\"";
          ai++;
        }

        if(macro.attributes["name"] == request.macro || 
           (macro.attributes.find("static") != macro.attributes.end() &&
            macro.attributes["static"] == "true")
           ) {
          foundmacro = true;

          MacroParser mp(env.macrolist.getLatestVersion(macro.attributes["name"]));
          mp.parse();
          Macro *m = mp.getMacro();
          answer += " caption=\"" + m->widgets.attributes["caption"] + "\"";
          answer += ">\n";

         AutoBorrower<Artefact*> borrower(env.atfpool);
         Artefact *atf = borrower.get();
         
         LUAQueryMapper lqm;

          ////////////////////////
          std::vector< Query >::iterator qi = m->queries.begin();
          while(qi != m->queries.end()) {

            Query &query = *qi;
            std::string service = query.attributes["service"];

            if(service == "pentominos") {
              // Send the queries to Pentominos (if any)
              QueryHandlerPentominos qh(*atf, transaction.cpr,
                                        "pracrod"/*user*/);

              QueryResult queryresult = qh.exec(*qi);
              lqm.addQueryResult(queryresult);
            }

            if(service == "pracro") {
              // Send the queries to Pentominos (if any)
              QueryHandlerPracro qh(*db, transaction.cpr);

              QueryResult queryresult = qh.exec(*qi);
              lqm.addQueryResult(queryresult);
            }

            qi++;
          }

          // Handle scripts
          if(m->scripts.size()) {
            answer += "      <scripts>\n";
            
            std::vector< Script >::iterator spi = m->scripts.begin();
            while(spi != m->scripts.end()) {
              //              answer += "        <script language=\"" +
              //                spi->attributes["language"] + "\">";
              answer += "        <script>";

              if(spi->attributes.find("src") != spi->attributes.end()) {
                std::string file =
                  Conf::xml_basedir + "/include/" + spi->attributes["src"];
                FILE *fp = fopen(file.c_str(), "r");
                if(fp) {
                  char buf[64];
                  size_t sz;
                  std::string inc;
                  while((sz = fread(buf, 1, sizeof(buf), fp)) != 0) {
                    inc.append(buf, sz);
                  }
                  fclose(fp);
                  answer += "\n-- BEGIN INCLUDE: '" + spi->attributes["src"] + "'\n";
                  answer += xml_encode(inc);
                  answer += "\n-- END INCLUDE: '" + spi->attributes["src"] + "'\n";
                }
              } else {
                answer += xml_encode(spi->attributes["code"]);
              }
              answer += "</script>\n";
              spi++;
            }

            answer += "      </scripts>\n";
          }

          answer += widgetgenerator(transaction.cpr, session.id(),
                                    *m, lqm, *db);
        } else {
          // only find macro title
          MacroParser mp(env.macrolist.getLatestVersion(macro.attributes["name"]));
          mp.parse();
          Macro *m = mp.getMacro();
          answer += " caption=\"" + m->widgets.attributes["caption"] + "\"";
          answer += ">\n";

        }

        if(completed) {
          std::string jresume =
            session.journal()->getEntry(macro.attributes["name"]);

          std::string state = "old";
          std::string resume = db->getResume(transaction.cpr,
                                             macro,
                                             time(NULL) - Conf::db_max_ttl,
                                             session.id());
          if(session.journal()->dirty(macro.attributes["name"])) {
            state = "dirty";
          } else {
            if(resume == jresume) {
              state = "new";
            } else {
              if(jresume != "") {
                state = "dirty";
                session.journal()->setDirty(macro.attributes["name"]);
              } else {
                state = "old";
              }
            }
          }

          answer += "      <resume state=\""+state+"\">";
          answer += xml_encode(resume);
          answer += "</resume>\n";
        }

        answer += "    </macro>\n";
        mi2++;

      }
      
      if(foundmacro == false && request.macro != "")
        throw NotFoundException(request);

      answer += "  </template>\n";

      i++;
    }
  }

  return answer;
}

std::string handleTransaction(Transaction &transaction, Environment &env,
                              Session &session)
{
  std::string answer;

  answer += "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n";
  answer += "<pracro version=\"1.0\">\n";

  try {
    answer += handleCommits(transaction, env, session);
  } catch( std::exception &e ) {
    ERR(server, "Commit error: %s\n", e.what());
    return error_box(xml_encode(e.what()));
  }

  try {
    answer += handleRequest(transaction, env, session);
  } catch( std::exception &e ) {
    ERR(server, "Request error: %s\n", e.what());
    return error_box(xml_encode(e.what()));
  }

  answer += "</pracro>\n";

  DEBUG(server, "Done handling transaction\n");
  DEBUG(serverxml, "%s\n", answer.c_str());

  return answer;
}

#ifdef TEST_TRANSACTIONHANDLER
//deps:
//cflags: -I..
//libs:
#include "test.h"

TEST_BEGIN;

#error TODO: Put some testcode here (see test.h for usable macros).

TEST_END;

#endif/*TEST_TRANSACTIONHANDLER*/