/*
 * MapView.cpp
 * 
 * Copyright (C) 2008 Matthias Schiffer <matthias@gamezock.de>
 * 
 * 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 3 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, see <http://www.gnu.org/licenses/>.
 */

#include "MapView.h"
#include "TopView.h"

#include <Instance.h>
#include <Data/Level.h>
#include <Data/Room.h>
#include <Data/Triangle.h>
#include <Gui/RenderArea.h>

#include <GL/gl.h>
#include <cmath>
#include <list>

namespace ZoomEdit {
namespace View {

void MapView::setMainView(TopView *mainView0) {
  mainView = mainView0;
  
  if(mainViewUpdate)
    mainViewUpdate.disconnect();
  
  if(mainView)
    mainViewUpdate = mainView->signalUpdate().connect(signalUpdate());
}

void MapView::init() {
  glClearColor(0, 0, 0, 0);
  
  glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
  glEnable(GL_BLEND);
  
  glEnable(GL_LINE_SMOOTH);
  glEnable(GL_POINT_SMOOTH);
}

void MapView::resize(float width, float height) {
  if(width == viewWidth && height == viewHeight)
    return;
  
  viewWidth = width; viewHeight = height;
  
  glViewport(0, 0, width, height);
  
  glMatrixMode(GL_PROJECTION);
  glLoadIdentity();
  
  if(width != 0 && height != 0)
    glScalef(2.0f/width, -2.0f/height, 1);
  
  signalUpdate().emit();
}

void MapView::zoom(int zoom, float, float) {
  if(!mainView)
    return;
  
  mainView->zoom(zoom, 0, 0);
}

void MapView::move(float x, float y, unsigned int state) {
  if(!mainView)
    return;
  
  if(!(state & GDK_BUTTON1_MASK))
    return;
  
  mainView->setXCenter(mainView->getXCenter() - x/scale);
  mainView->setYCenter(mainView->getYCenter() - y/scale);
}

void MapView::click(float x, float y, unsigned int button) {
  if(!mainView || button != 1)
    return;
  
  mainView->setXCenter(xCenter + x/scale);
  mainView->setYCenter(yCenter + y/scale);
}

void MapView::render() {
  glClear(GL_COLOR_BUFFER_BIT);
  
  if(!mainView || !mainView->getInstance()->getLevel())
    return;
  
  float minX, maxX, minY, maxY;
  getBounds(&minX, &maxX, &minY, &maxY);
  
  xCenter = (minX+maxX)/2; yCenter = (minY+maxY)/2;
  float width = maxX-minX, height=maxY-minY;
  
  if(width == 0 || height == 0)
    return;
  
  scale = std::min(viewWidth/width, viewHeight/height)*0.75f;
  
  glMatrixMode(GL_MODELVIEW);
  glPushMatrix();
  
  glScalef(scale, scale, 1);
  glTranslatef(-xCenter, -yCenter, 0);
  
  const std::list<Data::Room*> &rooms = mainView->getInstance()->getLevel()->getRooms();
  
  for(std::list<Data::Room*>::const_iterator room = rooms.begin(); room != rooms.end(); ++room)
    TopView::renderRoom(*room, (*room == mainView->getInstance()->getSelectedRoom()));
  
  float mainXCenter = mainView->getXCenter(), mainYCenter = mainView->getYCenter();
  float mainScale = mainView->getScale();
  
  float mainWidth = mainView->getWidth()/mainScale, mainHeight = mainView->getHeight()/mainScale;
  
  glColor4f(0.7f, 0.7f, 0.7f, 0.3f);
  
  glBegin(GL_POLYGON);
  
  glVertex2f(mainXCenter-mainWidth/2, mainYCenter-mainHeight/2);
  glVertex2f(mainXCenter+mainWidth/2, mainYCenter-mainHeight/2);
  glVertex2f(mainXCenter+mainWidth/2, mainYCenter+mainHeight/2);
  glVertex2f(mainXCenter-mainWidth/2, mainYCenter+mainHeight/2);
  
  glEnd();
  
  glColor4f(0.7f, 0.7f, 0.7f, 0.7f);
  glLineWidth(1.0f);
  
  glBegin(GL_LINE_LOOP);
  
  glVertex2f(mainXCenter-mainWidth/2, mainYCenter-mainHeight/2);
  glVertex2f(mainXCenter+mainWidth/2, mainYCenter-mainHeight/2);
  glVertex2f(mainXCenter+mainWidth/2, mainYCenter+mainHeight/2);
  glVertex2f(mainXCenter-mainWidth/2, mainYCenter+mainHeight/2);
  
  glEnd();
  
  glMatrixMode(GL_MODELVIEW);
  glPopMatrix();
}

void MapView::getBounds(float *minX, float *maxX, float *minY, float *maxY) {
  if(minX)
    *minX = 0;
  if(maxX)
    *maxX = 0;
  if(minY)
    *minY = 0;
  if(maxY)
    *maxY = 0;
  
  if(!mainView || !mainView->getInstance()->getLevel())
    return;
  
  const std::list<Data::Room*> &rooms = mainView->getInstance()->getLevel()->getRooms();
  
  for(std::list<Data::Room*>::const_iterator room = rooms.begin(); room != rooms.end(); ++room) {
    const std::list<Data::Triangle*> &triangles = (*room)->getTriangles();
    
    for(std::list<Data::Triangle*>::const_iterator t = triangles.begin(); t != triangles.end(); ++t) {
      const vmml::vec3f &v1 = (*t)->getVertex(0), &v2 = (*t)->getVertex(1), &v3 = (*t)->getVertex(2);
      
      if(minX)
        *minX = std::min(std::min(*minX, v1.x()), std::min(v2.x(), v3.x()));
      if(maxX)
        *maxX = std::max(std::max(*maxX, v1.x()), std::max(v2.x(), v3.x()));
      if(minY)
        *minY = std::min(std::min(*minY, v1.z()), std::min(v2.z(), v3.z()));
      if(maxY)
        *maxY = std::max(std::max(*maxY, v1.z()), std::max(v2.z(), v3.z()));
    }
  }
}


}
}