/*
 * This file is part of OpenModelica.
 *
 * Copyright (c) 1998-2008, Linkopings University,
 * Department of Computer and Information Science,
 * SE-58183 Linkoping, Sweden.
 *
 * All rights reserved.
 *
 * THIS PROGRAM IS PROVIDED UNDER THE TERMS OF THIS OSMC PUBLIC
 * LICENSE (OSMC-PL). ANY USE, REPRODUCTION OR DISTRIBUTION OF
 * THIS PROGRAM CONSTITUTES RECIPIENT'S ACCEPTANCE OF THE OSMC
 * PUBLIC LICENSE.
 *
 * The OpenModelica software and the Open Source Modelica
 * Consortium (OSMC) Public License (OSMC-PL) are obtained
 * from Linkopings University, either from the above address,
 * from the URL: http://www.ida.liu.se/projects/OpenModelica
 * and in the OpenModelica distribution.
 *
 * This program is distributed  WITHOUT ANY WARRANTY; without
 * even the implied warranty of  MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE, EXCEPT AS EXPRESSLY SET FORTH
 * IN THE BY RECIPIENT SELECTED SUBSIDIARY LICENSE CONDITIONS
 * OF OSMC-PL.
 *
 * See the full OSMC Public License conditions for more details.
 *
 * Main contributor 2010, Hubert Thierot, CEP - ARMINES (France)
 * Main contributor 2010, Hubert Thierot, CEP - ARMINES (France)
 * For more information about the Qt-library visit TrollTech's webpage 
 * regarding the Qt licence: http://www.trolltech.com/products/qt/licensing.html
 */

// FILE/CLASS ADDED 2005-12-12 /AF

/*!
* \file commandcompetion.h
* \author Anders Fernstrom
* \date 2005-12-12
*/


//STD Headers
#include <exception>
#include <iostream>
#include <cstdlib>
#include <stdexcept>

//QT Headers
#include <QtCore/QFile>

//IAEX Headers
#include "commandcompletion.h"


using namespace std;

namespace IAEX
{
    /*!
     * \class CommandCompletion
     * \author Anders Fernstrom
     * \date 2005-12-12
     *
     * \brief Reads a command file and creates omc command object for
     * commandcompetion in inputcells
     */

    /*!
     * \author Anders Fernstrom
     * \date 2005-12-12
     *
     * \brief The class constructor
     *
     * \brief Reads a given file and construct a DOM tree from that file.
     * If the file is corrupt a exception will be throwed.
     *
     * \param filename The file that will be read.
     */
    CommandCompletion::CommandCompletion( const QString &filename )
        : currentCommand_( -1 ),
        currentField_( -1 ),
        currentList_( 0 ),
        commandStartPos_( 0 ),
        commandEndPos_( 0 )
    {
        //read a command file.
        doc_ = new QDomDocument( "OMCCommand" );

        QFile file( filename );
        if(!file.open(QIODevice::ReadOnly))
        {
            string tmp = "Could not open file: " + filename.toStdString();
            throw runtime_error( tmp.c_str() );
        }

        if( !doc_->setContent(&file) )
        {
            file.close();
            string tmp = "Could not read content from file: " +
                filename.toStdString() +
                " Probably some syntax error in the xml file";
            throw runtime_error( tmp.c_str() );
        }
        file.close();

        // initialize all commands in the command file
        initializeCommands();
    }

    CommandCompletion *CommandCompletion::instance_ = 0;

    /*
     * \author Anders Fernstrom
     * \date 2005-12-12
     *
     * \brief Instance the CommandCompetion object.
     *
     * \param filename The file that will be read.
     * \return The CommandCompetion object
     */
    CommandCompletion *CommandCompletion::instance( const QString &filename )
    {
        if( !instance_ )
            instance_ = new CommandCompletion( filename );

        return instance_;
    }

    /*
     * \author Anders Fernstrom
     * \date 2005-12-12
     * \date 2005-12-15 (update)
     *
     * \brief Insert a command into the text, if the text match a command
     *
     * 2005-12-15 AF, implemented function
     *
     * \param cursor The text cursor to the text where the command should
     * be inserted
     * \return TURE if a command is inserted
     */
    bool CommandCompletion::insertCommand( QTextCursor &cursor )
    {
        // check if cursor is okej
        if( !cursor.isNull() )
        {
            // first remove any old currentList_
            if( currentList_ )
            {
                delete currentList_;
                currentList_ = 0;
            }

            // reset currentCommand_ && currentField_
            currentCommand_ = -1;
            currentField_ = -1;

            // find current word in text
            cursor.movePosition( QTextCursor::StartOfWord, QTextCursor::KeepAnchor );
            QString command = cursor.selectedText();

            if( !command.isNull() && !command.isEmpty() )
            {
                // check if any comman match the current word in the text
                currentList_ = new QStringList();
                for( int i = 0; i < commandList_.size(); ++i )
                {
                    if( 0 == commandList_.at(i).indexOf( command, 0, Qt::CaseInsensitive ))
                        currentList_->append( commandList_.at(i) );
                }

                //cout << "Found commands (" << command.toStdString() << "):" << endl;
                //for( int i = 0; i < currentList_->size(); ++i )
                //    cout << " >" << currentList_->at(i).toStdString() << endl;

                // found one or more commands that match the word
                if( currentList_->size() > 0 )
                {
                    currentCommand_ = 0;

                    commandStartPos_ = cursor.position();
                    cursor.insertText( currentList_->at( currentCommand_ ));
                    commandEndPos_ = cursor.position();

                    // select first field, if any
                    nextField( cursor );

                    return true;
                }
                else
                {
                    delete currentList_;
                    currentList_ = 0;
                }
            }
        }

        return false;
    }

    /*
     * \author Anders Fernstrom
     * \date 2005-12-12
     *
     * \brief Insert the next possible command into the text, that match
     * a command
     *
     * \param cursor The text cursor to the text where the command should
     * be inserted
     * \return TURE if a command is inserted
     */
    bool CommandCompletion::nextCommand( QTextCursor &cursor )
    {
        // check if cursor is okej
        if( !cursor.isNull() )
        {
            // check if currentList_ exists
            if( currentCommand_ >= 0 && currentList_ )
            {
                // if no more commands existes, restart
                if( currentCommand_ >= (currentList_->size()-1) )
                    currentCommand_ = -1;

                // reset currentField_
                currentField_ = -1;

                //next command
                currentCommand_++;
                cursor.setPosition( commandStartPos_ );
                cursor.setPosition( commandEndPos_, QTextCursor::KeepAnchor );
                cursor.insertText( currentList_->at( currentCommand_ ));
                commandEndPos_ = cursor.position();

                // select first field, if any
                nextField( cursor );

                return true;
            }
        }

        return false;
    }

    /*
     * \author Anders Fernstrom
     * \date 2005-12-12
     *
     * \brief Returns the help text to the current command
     *
     * \return Helpt text to current command
     */
    QString CommandCompletion::helpCommand()
    {
        if( currentCommand_ >= 0 )
        {
            if( currentList_->size() > currentCommand_ )
            {
                QString command = currentList_->at( currentCommand_ );
                if( commands_.contains( command ))
                    return commands_[command]->helptext();
            }
        }

        return QString::null;
    }

    /*
     * \author Anders Fernstrom
     * \date 2005-12-12
     * \date 2005-12-15 (update)
     *
     * \brief Select next (if any) field in current command
     *
     * 2005-12-15 AF, implemented function
     *
     * \return TURE if a field is selected
     */
    bool CommandCompletion::nextField( QTextCursor &cursor )
    {
        // check if cursor is okej
        if( !cursor.isNull() )
        {
            if( currentCommand_ >= 0 && currentCommand_ < currentList_->size() )
            {
                QString command = currentList_->at( currentCommand_ );

                if( commands_.contains( command ))
                {
                    if( currentField_ < (commands_[command]->numbersField() - 1) )
                    {
                        //next field
                        currentField_++;
                        QString fieldID;
                        fieldID.setNum( currentField_ );
                        fieldID = "$" + fieldID;
                        QString field = commands_[command]->datafield( fieldID );

                        if( !field.isNull() )
                        {
                            // get text in editor
                            cursor.setPosition( commandStartPos_ );
                            cursor.movePosition( QTextCursor::EndOfBlock, QTextCursor::KeepAnchor );
                            QString text = cursor.selectedText();

                            int pos = text.indexOf( field, 0 );
                            if( pos >= 0 )
                            {
                                // select field
                                cursor.setPosition( commandStartPos_ + pos );
                                cursor.setPosition( commandStartPos_ + pos + field.size(), QTextCursor::KeepAnchor );
                                return true;
                            }
                        }
                    }
                }
            }
        }

        return false;
    }

    /*!
     * \example from commands.xml
     *
     * <command name="simulate($1|, startTime=$2|, stopTime=$3|, numberOfIntervals=$4|)">
     *    <field name="$1|">modelname</field>
     *    <field name="$2|">&lt;Real></field>
     *    <field name="$3|">&lt;Real></field>
     *    <field name="$4|">&lt;Integer></field>
     *    <helptext>Translates a model and simulates it. Ex: simulate(dcmotor). Ex: simulate(dcmotor,startTime=0, stopTime=10, numberOfIntervals=1000).</helptext>
     * </command>
     *
     */

    /*
     * \author Anders Fernstrom
     * \date 2005-12-12
     *
     * \brief loop through the DOM tree and creates CommandUnit after
     * specified commands.
     */
    void CommandCompletion::initializeCommands()
    {
        QDomElement root = doc_->documentElement();
        QDomNode node = root.firstChild();

        // loop through the DOM tree
        while( !node.isNull() )
        {
            QDomElement element = node.toElement();
            if( !element.isNull() )
            {
                if( element.tagName() == "command" )
                {
                    CommandUnit *unit = new CommandUnit( element.attribute( "name" ));
                    QDomNode n = element.firstChild();
                    parseCommand( n, unit );

                    commands_.insert( unit->fullName(), unit );
                    commandList_.append( unit->fullName() );
                }
            }
            node = node.nextSibling();
        }
    }

    /*
     * \author Anders Fernstrom
     * \date 2005-12-12
     *
     * \brief parse through a command tag in the DOM tree
     */
    void CommandCompletion::parseCommand( QDomNode node, CommandUnit *item ) const
    {
        if( !item )
            throw runtime_error( "ParseCommand... No ITEM set" );

        while( !node.isNull() )
        {
            QDomElement element = node.toElement();

            if( element.tagName() == "field" )
                item->addDataField( element.attribute( "name" ), element.text() );
            else if( element.tagName() == "helptext" )
                item->setHelptext( element.text() );
            else
                cout << "Tag not known" << element.tagName().toStdString();

            node = node.nextSibling();
        }
    }

}
