/*
Copyright (C) 2001-2006, William Joseph.
All Rights Reserved.

This file is part of GtkRadiant.

GtkRadiant 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.

GtkRadiant 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 GtkRadiant; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
*/

#if !defined(INCLUDED_DRAGPLANES_H)
#define INCLUDED_DRAGPLANES_H

#include "selectable.h"
#include "selectionlib.h"
#include "math/aabb.h"
#include "math/line.h"

// local must be a pure rotation
inline Vector3 translation_to_local(const Vector3& translation, const Matrix4& local)
{
  return matrix4_get_translation_vec3(
    matrix4_multiplied_by_matrix4(
      matrix4_translated_by_vec3(matrix4_transposed(local), translation),
      local
    )
  );
}

// local must be a pure rotation
inline Vector3 translation_from_local(const Vector3& translation, const Matrix4& local)
{
  return matrix4_get_translation_vec3(
    matrix4_multiplied_by_matrix4(
      matrix4_translated_by_vec3(local, translation),
      matrix4_transposed(local)
    )
  );
}

class DragPlanes
{
public:
  ObservedSelectable m_selectable_right; // +x
  ObservedSelectable m_selectable_left; // -x
  ObservedSelectable m_selectable_front; // +y
  ObservedSelectable m_selectable_back; // -y
  ObservedSelectable m_selectable_top; // +z
  ObservedSelectable m_selectable_bottom; // -z
  AABB m_bounds;

  DragPlanes(const SelectionChangeCallback& onchanged) :
    m_selectable_right(onchanged),
    m_selectable_left(onchanged),
    m_selectable_front(onchanged),
    m_selectable_back(onchanged),
    m_selectable_top(onchanged),
    m_selectable_bottom(onchanged)
  {
  }
  bool isSelected() const
  {
    return m_selectable_right.isSelected()
      || m_selectable_left.isSelected()
      || m_selectable_front.isSelected()
      || m_selectable_back.isSelected()
      || m_selectable_top.isSelected()
      || m_selectable_bottom.isSelected();
  }
  void setSelected(bool selected)
  {
    m_selectable_right.setSelected(selected);
    m_selectable_left.setSelected(selected);
    m_selectable_front.setSelected(selected);
    m_selectable_back.setSelected(selected);
    m_selectable_top.setSelected(selected);
    m_selectable_bottom.setSelected(selected);
  }
  void selectPlanes(const AABB& aabb, Selector& selector, SelectionTest& test, const PlaneCallback& selectedPlaneCallback, const Matrix4& rotation = g_matrix4_identity)
  {
    Line line(test.getNear(), test.getFar());
    Vector3 corners[8];
    aabb_corners_oriented(aabb, rotation, corners);

    Plane3 planes[6];
    aabb_planes_oriented(aabb, rotation, planes);

    for(Vector3* i = corners; i != corners + 8; ++i)
    {
      *i = vector3_subtracted(line_closest_point(line, *i), *i);
    }

    if(vector3_dot(planes[0].normal(), corners[1]) > 0
      && vector3_dot(planes[0].normal(), corners[2]) > 0
      && vector3_dot(planes[0].normal(), corners[5]) > 0
      && vector3_dot(planes[0].normal(), corners[6]) > 0)
    {
      Selector_add(selector, m_selectable_right);
      selectedPlaneCallback(planes[0]);
      //globalOutputStream() << "right\n";
    }
    if(vector3_dot(planes[1].normal(), corners[0]) > 0
      && vector3_dot(planes[1].normal(), corners[3]) > 0
      && vector3_dot(planes[1].normal(), corners[4]) > 0
      && vector3_dot(planes[1].normal(), corners[7]) > 0)
    {
      Selector_add(selector, m_selectable_left);
      selectedPlaneCallback(planes[1]);
      //globalOutputStream() << "left\n";
    }
    if(vector3_dot(planes[2].normal(), corners[0]) > 0
      && vector3_dot(planes[2].normal(), corners[1]) > 0
      && vector3_dot(planes[2].normal(), corners[4]) > 0
      && vector3_dot(planes[2].normal(), corners[5]) > 0)
    {
      Selector_add(selector, m_selectable_front);
      selectedPlaneCallback(planes[2]);
      //globalOutputStream() << "front\n";
    }
    if(vector3_dot(planes[3].normal(), corners[2]) > 0
      && vector3_dot(planes[3].normal(), corners[3]) > 0
      && vector3_dot(planes[3].normal(), corners[6]) > 0
      && vector3_dot(planes[3].normal(), corners[7]) > 0)
    {
      Selector_add(selector, m_selectable_back);
      selectedPlaneCallback(planes[3]);
      //globalOutputStream() << "back\n";
    }
    if(vector3_dot(planes[4].normal(), corners[0]) > 0
      && vector3_dot(planes[4].normal(), corners[1]) > 0
      && vector3_dot(planes[4].normal(), corners[2]) > 0
      && vector3_dot(planes[4].normal(), corners[3]) > 0)
    {
      Selector_add(selector, m_selectable_top);
      selectedPlaneCallback(planes[4]);
      //globalOutputStream() << "top\n";
    }
    if(vector3_dot(planes[5].normal(), corners[4]) > 0
      && vector3_dot(planes[5].normal(), corners[5]) > 0
      && vector3_dot(planes[5].normal(), corners[6]) > 0
      && vector3_dot(planes[5].normal(), corners[7]) > 0)
    {
      Selector_add(selector, m_selectable_bottom);
      selectedPlaneCallback(planes[5]);
      //globalOutputStream() << "bottom\n";
    }

    m_bounds = aabb;
  }
  void selectReversedPlanes(const AABB& aabb, Selector& selector, const SelectedPlanes& selectedPlanes, const Matrix4& rotation = g_matrix4_identity)
  {
    Plane3 planes[6];
    aabb_planes_oriented(aabb, rotation, planes);

    if(selectedPlanes.contains(plane3_flipped(planes[0])))
    {
      Selector_add(selector, m_selectable_right);
    }
    if(selectedPlanes.contains(plane3_flipped(planes[1])))
    {
      Selector_add(selector, m_selectable_left);
    }
    if(selectedPlanes.contains(plane3_flipped(planes[2])))
    {
      Selector_add(selector, m_selectable_front);
    }
    if(selectedPlanes.contains(plane3_flipped(planes[3])))
    {
      Selector_add(selector, m_selectable_back);
    }
    if(selectedPlanes.contains(plane3_flipped(planes[4])))
    {
      Selector_add(selector, m_selectable_top);
    }
    if(selectedPlanes.contains(plane3_flipped(planes[5])))
    {
      Selector_add(selector, m_selectable_bottom);
    }
  }
  AABB evaluateResize(const Vector3& translation) const
  {
    Vector3 min = m_bounds.origin - m_bounds.extents;
    Vector3 max = m_bounds.origin + m_bounds.extents;
    if(m_bounds.extents[0] != 0)
    {
      if(m_selectable_right.isSelected())
      {
        max[0] += translation[0];
        //globalOutputStream() << "moving right\n";
      }
      if(m_selectable_left.isSelected())
      {
        min[0] += translation[0];
        //globalOutputStream() << "moving left\n";
      }
    }
    if(m_bounds.extents[1] != 0)
    {
      if(m_selectable_front.isSelected())
      {
        max[1] += translation[1];
        //globalOutputStream() << "moving front\n";
      }
      if(m_selectable_back.isSelected())
      {
        min[1] += translation[1];
        //globalOutputStream() << "moving back\n";
      }
    }
    if(m_bounds.extents[2] != 0)
    {
      if(m_selectable_top.isSelected())
      {
        max[2] += translation[2];
        //globalOutputStream() << "moving top\n";
      }
      if(m_selectable_bottom.isSelected())
      {
        min[2] += translation[2];
        //globalOutputStream() << "moving bottom\n";
      }
    }

    return AABB(vector3_mid(min, max), vector3_scaled(vector3_subtracted(max, min), 0.5));
  }
  AABB evaluateResize(const Vector3& translation, const Matrix4& rotation) const
  {
    AABB aabb(evaluateResize(translation_to_local(translation, rotation)));
    aabb.origin = m_bounds.origin + translation_from_local(aabb.origin - m_bounds.origin, rotation);
    return aabb;
  }
  Matrix4 evaluateTransform(const Vector3& translation) const
  {
    AABB aabb(evaluateResize(translation));
    Vector3 scale(
      m_bounds.extents[0] != 0 ? aabb.extents[0] / m_bounds.extents[0] : 1,
      m_bounds.extents[1] != 0 ? aabb.extents[1] / m_bounds.extents[1] : 1,
      m_bounds.extents[2] != 0 ? aabb.extents[2] / m_bounds.extents[2] : 1
    );

    Matrix4 matrix(matrix4_translation_for_vec3(aabb.origin - m_bounds.origin));
    matrix4_pivoted_scale_by_vec3(matrix, scale, m_bounds.origin);

    return matrix;
  }  
};

#endif
