/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/***************************************************************************
 *            macrowindow.cc
 *
 *  Fri Jul  4 12:29:41 CEST 2008
 *  Copyright 2008 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 "macrowindow.h"

#include <QLabel>
#include <QBoxLayout>
#include <QVBoxLayout>
#include <QHBoxLayout>

#include <math.h>

#include "widget.h"
#include "widgetwrapper.h"

MacroWindow::MacroWindow(Qt::Orientation orientation)
  : QFrame()
{
  this->orientation = orientation;
  setAcceptDrops(true);
  if(orientation == Qt::Horizontal) {
    setLayout(new QHBoxLayout());
  } else {
    setLayout(new QVBoxLayout());
  }
  //  layout()->setSpacing(0);
  //  layout()->setContentsMargins(2,2,2,2);
  //  show();
  dragObject = NULL;

  setFrameStyle(QFrame::Box | QFrame::Plain);
  QPalette pal;
  pal.setColor(QPalette::Foreground, Qt::blue);
  setPalette(pal);
}

void MacroWindow::dragEnterEvent(QDragEnterEvent *event)
{
  if(event->mimeData()->hasFormat("pracro/widget")) {
    event->acceptProposedAction();

    if(dragObject) delete dragObject;
    QFrame *frame = new QFrame();

    QPalette pal;
    pal.setColor(QPalette::Foreground, Qt::red);
    frame->setPalette(pal);

    if(orientation == Qt::Horizontal) {
      frame->setFixedWidth(1);
    } else {
      frame->setFixedHeight(1);
    }

    frame->setFrameStyle(QFrame::Box | QFrame::Plain);
    frame->setContentsMargins(1,1,0,0);

    dragObject = frame;

    QWidget *w = findWidget(event->pos());
    if(w) {
      int idx = ((QBoxLayout*)layout())->indexOf(w);
      ((QBoxLayout*)layout())->insertWidget(idx, dragObject);
    } else {
      layout()->addWidget(dragObject);
    }
  }
}

void MacroWindow::dragLeaveEvent(QDragLeaveEvent *)
{
  if(dragObject) delete dragObject;
  dragObject = NULL;
}

void MacroWindow::dragMoveEvent(QDragMoveEvent *event)
{
  if(event->mimeData()->hasFormat("pracro/widget")) {
    event->acceptProposedAction();

    layout()->removeWidget(dragObject);

    QWidget *w = findWidget(event->pos());
    if(w == dragObject) return;
 
    if(w) {
      int idx = ((QBoxLayout*)layout())->indexOf(w);
      ((QBoxLayout*)layout())->insertWidget(idx, dragObject);
    } else {
      layout()->addWidget(dragObject);
    }
  }
}

void MacroWindow::dropEvent(QDropEvent *event)
{
  if(event->mimeData()->hasFormat("pracro/widget")) {
    int idx = layout()->indexOf(dragObject);

    /*
    QString type = event->mimeData()->data("pracro/widget").data();
    QWidget *widget;    
    if(type == "horizontal") widget = new MacroWindow(Qt::Horizontal);
    else if(type == "vertical") widget = new MacroWindow(Qt::Vertical);
    else widget = new Widget(type);
    */
    QWidget *widget = unwrapWidget(event->mimeData()->data("pracro/widget"));
    widget->setVisible(true);

    ((QBoxLayout*)layout())->insertWidget(idx, widget);
    delete dragObject;
    dragObject = NULL;
    event->acceptProposedAction();
  }
}

QWidget *MacroWindow::findWidget(QPoint pos)
{
  QPoint newpos = pos;
  QWidget *w = childAt(newpos);

  float angle = 0.0;
  float dist = 0.0;
  while((!w || QString(w->metaObject()->className()) == "QFrame") && layout()->count()) {

    angle += M_PI / 4;
    dist += 1;

    newpos = pos + QPoint(sin(angle) * dist, cos(angle) * dist);

    if(newpos.x() > height() && newpos.y() > width() && newpos.y() < 0 && newpos.x() < 0) {
      break;
    }

    //    printf("%d, %d\n", newpos.x(), newpos.y());
    w = childAt(newpos);
  }
  //  printf("Done {%p %s}\n", w, w!=NULL?w->metaObject()->className():"(null)");

  if(w) {
    int idx = layout()->indexOf(w);
    //    printf("\r%d > %d", pos.y() - w->pos().y(), w->height() / 2); fflush(stdout);
    if(orientation == Qt::Horizontal) {
      if(pos.x() - w->pos().x() > w->width() / 2) idx++;
    } else {
      if(pos.y() - w->pos().y() > w->height() / 2) idx++;
    }
 
    //    if(idx < layout()->count()) idx = layout()->count() - 1;
    if(idx >= 0 && idx < layout()->count()) w = layout()->itemAt(idx)->widget();
    else w = NULL;
  }

  return w;
}

void MacroWindow::mousePressEvent(QMouseEvent *event)
{
  if(event->button() == Qt::LeftButton) {
    
    QDrag *drag = new QDrag(this);
    drag->setPixmap(QPixmap("drag.png"));
    
    QMimeData *mimedata = new QMimeData();
    
    mimedata->setData("pracro/widget", wrapWidget(this));

    drag->setMimeData(mimedata);
    
    QWidget *parent = parentWidget();
    if(parent) {
      parent->layout()->removeWidget(this);
      setVisible(false);
      drag->exec();
    }
  }
}