/****************************************************************************

   Copyright (C) 2002-2008 Gilles Debunne. All rights reserved.

   This file is part of the QGLViewer library version 2.3.5.

   http://www.libqglviewer.com - contact@libqglviewer.com

   This file may be used under the terms of the GNU General Public License
   versions 2.0 or 3.0 as published by the Free Software Foundation and
   appearing in the LICENSE file included in the packaging of this file.
   In addition, as a special exception, Gilles Debunne gives you certain
   additional rights, described in the file GPL_EXCEPTION in this package.

   libQGLViewer uses dual licensing. Commercial/proprietary software must
   purchase a libQGLViewer Commercial License.

   This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
   WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

 *****************************************************************************/

#include "board.h"
#include <qgl.h>
#include <QGLViewer/vec.h>

using namespace qglviewer;

void Board::draw() const
{
  for(int i = 0; i < sizeX_; ++i)
    for(int j = 0; j < sizeY_; ++j) {
      QPoint p(i, j);
      if(stateOf(p) != HOLE) {
        Board::drawBlock(i, j);
        if(stateOf(p) != EMPTY)
          drawPiece(p, stateOf(p) == BLUE);
      }
    }
}

void Board::drawShadows() const
{
  glDisable(GL_LIGHTING);
  glEnable(GL_BLEND);
  for(int i = 0; i < sizeX_; ++i)
    for(int j = 0; j < sizeY_; ++j) {
      QPoint p(i, j);
      if((stateOf(p) != HOLE) && (stateOf(p) != EMPTY))
        drawShadow(p);
    }
  glDisable(GL_BLEND);
}

void Board::drawBlock(int i, int j)
{
  static const float thickness = 0.6f;
  glPushMatrix();
  glTranslatef(i, j, 0.0f);

  if((i + j) % 2)
    glColor3f(0.5, 0.5, 0.5);
  else
    glColor3f(0.7f, 0.7f, 0.7f);

  glBegin(GL_QUADS);
  // Top
  glNormal3f(0.0, 0.0, 1.0);
  glVertex2i(0, 0);
  glVertex2i(1, 0);
  glVertex2i(1, 1);
  glVertex2i(0, 1);

  // Sides
  glNormal3f(0.0, -1.0, 0.0);
  glVertex3f(0, 0, 0.0);
  glVertex3f(0, 0, -thickness);
  glVertex3f(1, 0, -thickness);
  glVertex3f(1, 0, 0.0);

  glNormal3f(1.0, 0.0, 0.0);
  glVertex3f(1, 0, 0.0);
  glVertex3f(1, 0, -thickness);
  glVertex3f(1, 1, -thickness);
  glVertex3f(1, 1, 0.0);

  glNormal3f(0.0, 1.0, 0.0);
  glVertex3f(1, 1, 0.0);
  glVertex3f(1, 1, -thickness);
  glVertex3f(0, 1, -thickness);
  glVertex3f(0, 1, 0.0);

  glNormal3f(-1.0, 0.0, 0.0);
  glVertex3f(0, 1, 0.0);
  glVertex3f(0, 1, -thickness);
  glVertex3f(0, 0, -thickness);
  glVertex3f(0, 0, 0.0);
  glEnd();

  glDisable(GL_LIGHTING);
  glLineWidth(2.0);
  glColor3f(0.3f, 0.3f, 0.3f);
  glBegin(GL_LINE_LOOP);
  glVertex3f(0.0, 0.0, 0.004f);
  glVertex3f(1.0, 0.0, 0.004f);
  glVertex3f(1.0, 1.0, 0.004f);
  glVertex3f(0.0, 1.0, 0.004f);
  glEnd();
  glEnable(GL_LIGHTING);

  glPopMatrix();
}

void Board::drawSquare(const QPoint& p)
{
  glPushMatrix();
  glTranslatef(p.x(), p.y(), 0.001f);

  glBegin(GL_QUADS);
  glNormal3f(0.0, 0.0, 1.0);
  glVertex2i(0, 0);
  glVertex2i(1, 0);
  glVertex2i(1, 1);
  glVertex2i(0, 1);
  glEnd();

  glPopMatrix();
}

static qglviewer::Vec posOf(const QPoint& p) {
  return qglviewer::Vec(p.x() + 0.5, p.y() + 0.5, 0.0);
};

void Board::drawPiece(const QPoint& p, bool blue)
{
  glPushMatrix();
  Vec pos = posOf(p);
  glTranslatef(pos.x, pos.y, pos.z);
  drawPiece(blue);
  glPopMatrix();
}

void Board::drawFlippingPieces(const QPoint& p, bool flip) const
{
  for(int i = -1; i <= 1; ++i)
    for(int j = -1; j <= 1; ++j) {
      const QPoint q(p.x() + i, p.y() + j);
      if(isValid(q) && stateOf(q) == Board::blueColor(!bluePlays()))
        drawPiece(q, flip ^ bluePlays());
    }
}

void Board::drawPiece(bool blue)
{
  static GLUquadric* quadric = gluNewQuadric();

  if(blue)
    glColor3f(0.4f, 0.4f, 1.0);
  else
    glColor3f(1.0, 0.4f, 0.4f);
  gluCylinder(quadric, 0.3, 0.2, 0.6, 12, 1);
  glTranslatef(0.0f, 0.0f, 0.6f);
  gluDisk(quadric, 0.0, 0.2, 12, 1);
}

void Board::drawShadow(const QPoint& p)
{
  static GLUquadric* quadric = gluNewQuadric();

  glPushMatrix();
  glColor4f(0.4f, 0.4f, 0.4f, 0.5);
  const Vec pos = posOf(p);
  const Vec dir = pos.unit();
  glTranslatef(pos.x + 0.1f * dir.x, pos.y + 0.1f * dir.y, 0.004f);
  gluDisk(quadric, 0.0, 0.37, 12, 1);
  glPopMatrix();
}

void Board::drawSelectedPiece(int piece) const
{
  const QPoint sp = pointFromInt(piece);

  glEnable(GL_BLEND);
  glColor4f(0.3f, 0.9f, 0.3f, 0.8f);

  Board::drawSquare(sp);

  glDisable(GL_BLEND);
}

void Board::drawPossibleDestinations(int piece, bool select) const
{
  glEnable(GL_BLEND);

  const QPoint sp = pointFromInt(piece);
  bool blue = stateOf(sp) == Board::BLUE;
  for(int i = -2; i <= 2; ++i)
    for(int j = -2; j <= 2; ++j) {
      const QPoint p(sp.x() + i, sp.y() + j);
      if(isValid(p) && stateOf(p) == Board::EMPTY) {
        if(select)
          glPushName((intFromPoint(p)));
        else {
          bool close = ((abs(i) < 2) && (abs(j) < 2));
          if(blue)
            if(close)
              glColor3f(0.3f, 0.3f, 1.0);
            else
              glColor3f(0.5, 0.5, 1.0);
          else if(close)
            glColor3f(1.0, 0.3f, 0.3f);
          else
            glColor3f(1.0, 0.5, 0.5);
        }
        Board::drawSquare(p);
        if(select)
          glPopName();
      }
    }
  glDisable(GL_BLEND);
}

void Board::drawSelectablePieces() const
{
  for(int i = 0; i < sizeX_; ++i)
    for(int j = 0; j < sizeY_; ++j) {
      QPoint p(i, j);
      if((stateOf(p) == Board::blueColor(bluePlays())) && (pieceCanMove(p))) {
        glPushName(intFromPoint(p));
        drawPiece(p, true);
        drawSquare(p);
        glPopName();
      }
    }
}
