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 /*************************************************************************************
  *  Copyright (C) 2007 by Aleix Pol <aleixpol@kde.org>                               *
  *                                                                                   *
  *  This program 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.                           *
  *                                                                                   *
  *  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.  See the                    *
  *  GNU General Public License for more details.                                     *
  *                                                                                   *
  *  You should have received a copy of the GNU General Public License                *
  *  along with this program; if not, write to the Free Software                      *
  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA   *
  *************************************************************************************/
 
 #include <analitza/expression.h>
 #include <analitza/analyzer.h>
 
 #include <readline/readline.h>
 #include <readline/history.h>
 #include <QElapsedTimer>
 #include <QFile>
 
 using namespace std;
 
 using Analitza::Expression;
 
 Analitza::Analyzer a;
 
 enum CalcType { Evaluate, Calculate };
 
 static const char* prompt=">>> ";
 static const char* insidePrompt="... ";
 
 struct Config {
     CalcType calcType;
     bool showElapsedType;
 };
 static Config configuration;
 
 void calculate(const Expression& e, CalcType t)
 {
     Expression ans;
     a.setExpression(e);
     if(e.isCorrect()) {
         QElapsedTimer time;
         if(configuration.showElapsedType) time.start();
         
         if(t==Calculate)
             ans=a.calculate();
         else
             ans=a.evaluate();
         
         if(configuration.showElapsedType) qDebug() << "Ellapsed time: " << time.elapsed();
     }
     
     if(a.isCorrect()) {
         qDebug() << qPrintable(ans.toString());
         a.insertVariable(QStringLiteral("ans"), ans);
     } else {
         QStringList errors = a.errors();
         qDebug() << "Error:";
         foreach(const QString &err, errors)
             qDebug() << " -" << qPrintable(err);
     }
 }
 
 int main(int argc, char *argv[])
 {
     configuration.calcType=Evaluate;
     configuration.showElapsedType=false;
     
     for(int i=1; i<argc; ++i) {
         QByteArray arg=argv[i];
         if(arg=="--print-time")
             configuration.showElapsedType=true;
         else if(arg=="--calculate")
             configuration.calcType=Calculate;
         else if(arg=="--evaluate")
             configuration.calcType=Evaluate;
         else if(arg=="--help" || arg=="-h") {
             qDebug() << "This is KAlgebra console version";
             qDebug() << "Use: " << argv[0] << "[Options] ...";
             qDebug() << "\t--evaluate:\tTries to simplify symbolically before calculating";
             qDebug() << "\t--calculate:\tCalculates straight away. If some symbol is missing, it will fail";
             qDebug() << "\t--print-time:\tOutputs the ellapsed time of an operation";
             qDebug() << "\t--help:\t\twill print this help";
             qDebug() << "\t...\t\tfiles that will be executed first";
             return 0;
         } else {
             QFile f(arg);
             if(!f.open(QIODevice::ReadOnly)) {
                 qWarning() << "File not found: " << arg;
                 return 1;
             }
             
             QTextStream str(&f);
             a.importScript(&str);
             
             if(!a.isCorrect()) {
                 QStringList errors = a.errors();
                 qDebug() << "Error:";
                 foreach(const QString &err, errors)
                     qDebug() << " -" << qPrintable(err);
             }
         }
     }
     
     bool done=false;
     bool inside=false;
     
     using_history();
     QString entry;
     while(!done) {
         char * expr;
         if(inside)
             expr=readline(insidePrompt);
         else
             expr=readline(prompt);
         
         if(!expr)
             done=true;
         else if(*expr==0) {
             inside=false;
             entry.clear();
         } else {
             add_history(expr);
             entry+=QString::fromUtf8(expr);
             
             if(Expression::isCompleteExpression(entry)) {
                 Expression e(entry);
 //                 qDebug() << entry << e.toString();
                 calculate(e, configuration.calcType);
                 inside =false;
                 entry.clear();
             } else {
                 inside =true;
             }
         }
     }
     
     for(int i=0; i<history_get_history_state()->length; i++) {
         HIST_ENTRY *he = remove_history(i);
 #ifdef HAVE_FREE_HISTORY_ENTRY
         free_history_entry(he);
 #else
         free((void*)he->line);
         free(he);
 #endif
     }
     qDebug("\nExit.");
     return 0;
 }