/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/***************************************************************************
 *            combobox.cc
 *
 *  Wed Jul 18 10:35:52 CEST 2007
 *  Copyright 2007 Bent Bisballe Nyeng and Lars Bisballe Jensen
 *  deva@aasimon.org and elsenator@gmail.com
 ****************************************************************************/

/*
 *  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 "combobox.h"
#include <QDomNodeList>
#include <QCompleter>
#include <QRegExpValidator>
#include <QRegExp>
#include <QLineEdit>

#include "common.h"

// Enable this to make the combobox drawn in windows style.
// This will make its background red even when not expanded.
//#define STYLE_HACK

#ifdef STYLE_HACK
#include <QWindowsStyle>
QWindowsStyle s;
#endif/*STYLE_HACK*/

ComboBox::ComboBox(QDomNode &node, MacroWindow *macrowindow)
  : QComboBox(), Widget(node, macrowindow)
{
  setCommonAttributes(this, node);

#ifdef STYLE_HACK
  setStyle(&s);
#endif/*STYLE_HACK*/

  setInsertPolicy(QComboBox::InsertAlphabetically);

  QDomNodeList children = node.childNodes();
  QStringList itemlist;

  for (int i=0; i<children.count();i++) {
    QDomNode child = children.at(i);
    QDomElement combo_elem = child.toElement();
    if(combo_elem.hasAttribute("caption") && combo_elem.hasAttribute("value")) {
      addItem(combo_elem.attribute("caption"), combo_elem.attribute("value"));
      itemlist << combo_elem.attribute("caption");
    } else {
      printf("XML Error!!! Combobox item is missing one or more attributes...\n");
    }
  }

  // Make empty default selection.
  setCurrentIndex(-1);

  QDomElement elem = node.toElement();

  combotype = SELECT;
  if(elem.hasAttribute("type")) {
    if(elem.attribute("type") == "select") combotype = SELECT;
    if(elem.attribute("type") == "edit") combotype = EDIT;
    if(elem.attribute("type") == "search") combotype = SEARCH;
  }

  switch(combotype) {
  case SELECT:
    setEditable(false);

#ifndef STYLE_HACK
    setEditable(true);
    lineEdit()->setReadOnly(true);
    lineEdit()->installEventFilter(this);
#endif/*STYLE_HACK*/

    connect(this, SIGNAL(currentIndexChanged(QString)), this, SLOT(changed()));
    break;

  case EDIT:
    setEditable(true);

    connect(this, SIGNAL(editTextChanged(QString)), this, SLOT(changed()));
    break;

  case SEARCH:
    setEditable(true);
    {
      QString rxs = "(";
      for(int i = 0; i < itemlist.size(); i++) {
        if(rxs != "(") rxs += "|";
        rxs += QRegExp::escape(itemlist.at(i));
      }
      rxs += ")";
      rx = QRegExp(rxs);
      rx.setCaseSensitivity(Qt::CaseInsensitive);
    }
    {    
      QCompleter *completer = new QCompleter(itemlist, this);
      completer->setCaseSensitivity(Qt::CaseInsensitive);
      completer->setCompletionMode(QCompleter::PopupCompletion);
      setCompleter(completer);
      setValidator(new QRegExpValidator(rx, this));
    }

    connect(this, SIGNAL(editTextChanged(QString)), this, SLOT(changed()));
    break;
  }

  ischangingbyuser = false;
  changed();
  ischangingbyuser = true;
}

QString ComboBox::getValue()
{
  QString value;

  int idx = currentIndex();
  
  if(idx != -1 && itemText(idx) == currentText()) value = itemData(idx).toString();
  else value = currentText();

  return value;
}

void ComboBox::setValue(QString value, QString source)
{
  if(isUserSource(source)) emit wasChanged();

  int idx = findData(value);

  //  printf("setValue(\"%s\") - %d\n", value.toStdString().c_str(), idx);

  ischangingbyuser = false;
  setCurrentIndex(idx);
  ischangingbyuser = true;

  setInitialValue(value);

}

bool ComboBox::isValid()
{
  if(combotype == SELECT) {
    if(currentIndex() != -1) return true;
    else return false;
  }
  return rx.exactMatch(currentText()) && luaValidator();
}

void ComboBox::changed()
{
  if(ischangingbyuser) emit wasChanged();

  QPalette palette;

  if(isValid() && luaValidator()) {
    // valid string
    palette.setBrush(QPalette::Base, QBrush(QColor(255, 255, 255)));
  } else {
    // invalid string
    palette.setBrush(QPalette::Base, QBrush(QColor(230, 200, 200)));
  }

  if(lineEdit()) lineEdit()->setPalette(palette);
  else setPalette(palette);
}

void ComboBox::enable()
{
  setEnabled(true);
}

void ComboBox::disable()
{
  setEnabled(false);
}

bool ComboBox::isDisabled()
{
  return isEnabled() == false;
}

void ComboBox::connectFrom(const char *signal,
                           const QObject *receiver, const char *method)
{
  connect(this, signal, receiver, method);
}

void ComboBox::connectTo(const QObject *sender, const char *signal,
                         const char *method)
{
  connect(sender, signal, this, method);
}

bool ComboBox::setKeyboardFocus()
{
  setFocus();
  return true;
}

void ComboBox::setVisibility(bool visible)
{
  setVisible(visible);
}

bool ComboBox::eventFilter(QObject *obj, QEvent *event)
{
  if(combotype == SELECT) {
    if(event->type() == QEvent::MouseButtonRelease) {
      showPopup();
    }
  }

  return QObject::eventFilter(obj, event);
}