/*************************************************************************
 *                                                                       *
 * Open Dynamics Engine, Copyright (C) 2001-2003 Russell L. Smith.       *
 * All rights reserved.  Email: russ@q12.org   Web: www.q12.org          *
 *                                                                       *
 * This library is free software; you can redistribute it and/or         *
 * modify it under the terms of EITHER:                                  *
 *   (1) The GNU Lesser General Public License as published by the Free  *
 *       Software Foundation; either version 2.1 of the License, or (at  *
 *       your option) any later version. The text of the GNU Lesser      *
 *       General Public License is included with this library in the     *
 *       file LICENSE.TXT.                                               *
 *   (2) The BSD-style license that is included with this library in     *
 *       the file LICENSE-BSD.TXT.                                       *
 *                                                                       *
 * This library 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 files    *
 * LICENSE.TXT and LICENSE-BSD.TXT for more details.                     *
 *                                                                       *
 *************************************************************************/

#include <string>

#include <ode/ode.h>
#include <drawstuff/drawstuff.h>
#include "texturepath.h"

#ifdef _MSC_VER
#pragma warning(disable:4244 4305)  // for VC++, no precision loss complaints
#endif

// select correct drawing functions

#ifdef dDOUBLE
#define dsDrawBox dsDrawBoxD
#define dsDrawSphere dsDrawSphereD
#define dsDrawCylinder dsDrawCylinderD
#define dsDrawCapsule dsDrawCapsuleD
#endif


// some constants

#define NUM 10000			// max number of objects
#define DENSITY (5.0)		// density of all objects
#define GPB 3			// maximum number of geometries per body
#define MAX_CONTACTS 4		// maximum number of contact points per body
#define WORLD_SIZE 20
#define WORLD_HEIGHT 20


// dynamics and collision objects

struct MyObject {
  dBodyID body;			// the body
  dGeomID geom[GPB];		// geometries representing this body
};

static int num=0;		// number of objects in simulation
static int nextobj=0;		// next object to recycle if num==NUM
static dWorldID world;
static dSpaceID space = NULL;
static MyObject obj[NUM];
static dJointGroupID contactgroup;
static int selected = -1;	// selected object
static int show_aabb = 0;	// show geom AABBs?
static int show_contacts = 0;	// show contact points?
static int random_pos = 1;	// drop objects from random position?
static int draw_geom = 1;


// this is called by dSpaceCollide when two objects in space are
// potentially colliding.

static void nearCallback (void *, dGeomID o1, dGeomID o2)
{
  int i;
  // if (o1->body && o2->body) return;

  // exit without doing anything if the two bodies are connected by a joint
  dBodyID b1 = dGeomGetBody(o1);
  dBodyID b2 = dGeomGetBody(o2);
  if (b1 && b2 && dAreConnectedExcluding (b1,b2,dJointTypeContact)) return;

  dContact contact[MAX_CONTACTS];   // up to MAX_CONTACTS contacts per box-box
  for (i=0; i<MAX_CONTACTS; i++) {
    contact[i].surface.mode = dContactBounce | dContactSoftCFM;
    contact[i].surface.mu = dInfinity;
    contact[i].surface.mu2 = 0;
    contact[i].surface.bounce = 0.1;
    contact[i].surface.bounce_vel = 0.1;
    contact[i].surface.soft_cfm = 0.01;
  }
  if (int numc = dCollide (o1,o2,MAX_CONTACTS,&contact[0].geom,
			   sizeof(dContact))) {
    dMatrix3 RI;
    dRSetIdentity (RI);
    const dReal ss[3] = {0.02,0.02,0.02};
    for (i=0; i<numc; i++) {
      dJointID c = dJointCreateContact (world,contactgroup,contact+i);
      dJointAttach (c,b1,b2);
      if (show_contacts) dsDrawBox (contact[i].geom.pos,RI,ss);
    }
  }
}


// start simulation - set viewpoint

static void start()
{
  dAllocateODEDataForThread(dAllocateMaskAll);

  static float xyz[3] = {2.1640f,-1.3079f,3.7600f};
  static float hpr[3] = {125.5000f,-17.0000f,0.0000f};
  dsSetViewpoint (xyz,hpr);
  printf ("To drop another object, press:\n");
  printf ("   o to disable rendering.\n");
  printf ("   b for box.\n");
  printf ("   s for sphere.\n");
  printf ("   c for cylinder.\n");
  printf ("   x for a composite object.\n");
  printf ("   y for cylinder.\n");
  printf ("To select an object, press space.\n");
  printf ("To disable the selected object, press d.\n");
  printf ("To enable the selected object, press e.\n");
  printf ("To toggle showing the geom AABBs, press a.\n");
  printf ("To toggle showing the contact points, press t.\n");
  printf ("To toggle dropping from random position/orientation, press r.\n");
}


char locase(char c)
{
    if (c >= 'A' && c <= 'Z') return c - ('a'-'A');
    else return c;
}


// called when a key pressed

static void command (int cmd)
{
    int i,j,k;
    dReal sides[3];
    dMass m;
    bool setBody = false;

    cmd = locase(cmd);
    if (cmd == 'b' || cmd == 's' || cmd == 'c' || cmd == 'x' || cmd == 'y') {
        if (num < NUM) {
            // new object to be created
            i = num;
            num++;
        } else {
            // recycle existing object
            i = nextobj++;
            nextobj %= num; // wrap-around if needed

            // destroy the body and geoms for slot i
            dBodyDestroy (obj[i].body);
            obj[i].body = 0;

            for (k=0; k < GPB; k++)
                if (obj[i].geom[k]) {
                    dGeomDestroy(obj[i].geom[k]);
                    obj[i].geom[k] = 0;
                }
        }

        obj[i].body = dBodyCreate(world);

        for (k=0; k<3; k++)
            sides[k] = dRandReal()*0.5+0.1;

        dMatrix3 R;
        if (random_pos)  {
            dBodySetPosition(obj[i].body,
                             dRandReal()*2-1,dRandReal()*2-1,dRandReal()+2);
            dRFromAxisAndAngle(R,dRandReal()*2.0-1.0,dRandReal()*2.0-1.0,
                               dRandReal()*2.0-1.0,dRandReal()*10.0-5.0);
        } else {
            // higher than highest body position
            dReal maxheight = 0;
            for (k=0; k<num; k++) {
                const dReal *pos = dBodyGetPosition(obj[k].body);
                if (pos[2] > maxheight)
                    maxheight = pos[2];
            }
            dBodySetPosition(obj[i].body, 0,0,maxheight+1);
            dRSetIdentity(R);
            //dRFromAxisAndAngle (R,0,0,1,/*dRandReal()*10.0-5.0*/0);
        }

        dBodySetRotation(obj[i].body,R);

        if (cmd == 'b') {

            dMassSetBox(&m,DENSITY,sides[0],sides[1],sides[2]);
            obj[i].geom[0] = dCreateBox(space,sides[0],sides[1],sides[2]);

        } else if (cmd == 'c') {

            sides[0] *= 0.5;
            dMassSetCapsule(&m,DENSITY,3,sides[0],sides[1]);
            obj[i].geom[0] = dCreateCapsule (space,sides[0],sides[1]);

        } else if (cmd == 'y') {

            dMassSetCylinder(&m,DENSITY,3,sides[0],sides[1]);
            obj[i].geom[0] = dCreateCylinder(space,sides[0],sides[1]);

        } else if (cmd == 's') {

            sides[0] *= 0.5;
            dMassSetSphere (&m,DENSITY,sides[0]);
            obj[i].geom[0] = dCreateSphere (space,sides[0]);

        } else if (cmd == 'x') {

            setBody = true;
            // start accumulating masses for the composite geometries
            dMass m2;
            dMassSetZero (&m);

            dReal dpos[GPB][3];	// delta-positions for composite geometries
            dMatrix3 drot[GPB];
      
            // set random delta positions
            for (j=0; j<GPB; j++)
                for (k=0; k<3; k++)
                    dpos[j][k] = dRandReal()*0.3-0.15;
    
            for (k=0; k<GPB; k++) {
                if (k==0) {
                    dReal radius = dRandReal()*0.25+0.05;
                    obj[i].geom[k] = dCreateSphere (space,radius);
                    dMassSetSphere (&m2,DENSITY,radius);
                } else if (k==1) {
                    obj[i].geom[k] = dCreateBox(space,sides[0],sides[1],sides[2]);
                    dMassSetBox(&m2,DENSITY,sides[0],sides[1],sides[2]);
                } else {
                    dReal radius = dRandReal()*0.1+0.05;
                    dReal length = dRandReal()*1.0+0.1;
                    obj[i].geom[k] = dCreateCapsule(space,radius,length);
                    dMassSetCapsule(&m2,DENSITY,3,radius,length);
                }

                dRFromAxisAndAngle(drot[k],dRandReal()*2.0-1.0,dRandReal()*2.0-1.0,
                                   dRandReal()*2.0-1.0,dRandReal()*10.0-5.0);
                dMassRotate(&m2,drot[k]);
		
                dMassTranslate(&m2,dpos[k][0],dpos[k][1],dpos[k][2]);

                // add to the total mass
                dMassAdd(&m,&m2);

            }
            for (k=0; k<GPB; k++) {
                dGeomSetBody(obj[i].geom[k],obj[i].body);
                dGeomSetOffsetPosition(obj[i].geom[k],
                                       dpos[k][0]-m.c[0],
                                       dpos[k][1]-m.c[1],
                                       dpos[k][2]-m.c[2]);
                dGeomSetOffsetRotation(obj[i].geom[k], drot[k]);
            }
            dMassTranslate(&m,-m.c[0],-m.c[1],-m.c[2]);
            dBodySetMass(obj[i].body,&m);

        }

        if (!setBody) { // avoid calling for composite geometries
            for (k=0; k < GPB; k++)
                if (obj[i].geom[k])
                    dGeomSetBody(obj[i].geom[k],obj[i].body);

            dBodySetMass(obj[i].body,&m);
        }
    }


  if (cmd == ' ') {
    selected++;
    if (selected >= num) selected = 0;
    if (selected < 0) selected = 0;
  }
  else if (cmd == 'd' && selected >= 0 && selected < num) {
    dBodyDisable (obj[selected].body);
  }
  else if (cmd == 'e' && selected >= 0 && selected < num) {
    dBodyEnable (obj[selected].body);
  }
  else if (cmd == 'a') {
    show_aabb ^= 1;
  }
  else if (cmd == 't') {
    show_contacts ^= 1;
  }
  else if (cmd == 'r') {
    random_pos ^= 1;
  }
  else if (cmd == 'o') {
    draw_geom ^= 1;
  }
}


// draw a geom

void drawGeom (dGeomID g, const dReal *pos, const dReal *R, int show_aabb)
{
    if (!draw_geom){
        return;
    }

    if (!g) return;
    if (!pos) pos = dGeomGetPosition(g);
    if (!R) R = dGeomGetRotation(g);

    int type = dGeomGetClass (g);
    if (type == dBoxClass) {
        dVector3 sides;
        dGeomBoxGetLengths(g,sides);
        dsDrawBox(pos,R,sides);
    }
    else if (type == dSphereClass) {
        dsDrawSphere(pos,R,dGeomSphereGetRadius (g));
    }
    else if (type == dCapsuleClass) {
        dReal radius,length;
        dGeomCapsuleGetParams(g,&radius,&length);
        dsDrawCapsule (pos,R,length,radius);
    } else if (type == dCylinderClass) {
        dReal radius,length;
        dGeomCylinderGetParams(g,&radius,&length);
        dsDrawCylinder(pos,R,length,radius);
    }

    if (show_aabb) {
        // draw the bounding box for this geom
        dReal aabb[6];
        dGeomGetAABB(g,aabb);
        dVector3 bbpos;
        for (int i=0; i<3; i++)
            bbpos[i] = 0.5*(aabb[i*2] + aabb[i*2+1]);
        dVector3 bbsides;
        for (int j=0; j<3; j++)
            bbsides[j] = aabb[j*2+1] - aabb[j*2];
        dMatrix3 RI;
        dRSetIdentity(RI);
        dsSetColorAlpha(1,0,0,0.5);
        dsDrawBox(bbpos,RI,bbsides);
    }
}


// simulation loop

static void simLoop (int pause)
{
  dsSetColor (0,0,2);
  dSpaceCollide (space,0,&nearCallback);
  //if (!pause) dWorldStep (world,0.05);
  if (!pause) dWorldQuickStep (world,0.05);
  //if (!pause) dWorldStepFast (world,0.05, 1);

  // remove all contact joints
  dJointGroupEmpty (contactgroup);

  dsSetColor (1,1,0);
  dsSetTexture (DS_WOOD);
  for (int i=0; i<num; i++) {
    for (int j=0; j < GPB; j++) {
      if (i==selected) {
	dsSetColor (0,0.7,1);
      }
      else if (! dBodyIsEnabled (obj[i].body)) {
	dsSetColor (1,0,0);
      }
      else {
	dsSetColor (1,1,0);
      }
      drawGeom (obj[i].geom[j],0,0,show_aabb);
    }
  }
}


int main (int argc, char **argv)
{
  // setup pointers to drawstuff callback functions
  dsFunctions fn;
  fn.version = DS_VERSION;
  fn.start = &start;
  fn.step = &simLoop;
  fn.command = &command;
  fn.stop = 0;
  fn.path_to_textures = DRAWSTUFF_TEXTURE_PATH;

  dsSetSphereQuality(0);

  // create world
  dInitODE2(0);
  world = dWorldCreate();

  for (int i=1; i<argc; ++i) {
      if (argv[i] == std::string("quad")) {
          dVector3 Center = {0, 0, 0, 0};
          dVector3 Extents = {WORLD_SIZE * 0.55, WORLD_SIZE * 0.55, WORLD_SIZE * 0.55, 0};
          puts(":::: Using dQuadTreeSpace");
          space = dQuadTreeSpaceCreate (0, Center, Extents, 6);
      } else if (argv[i] == std::string("hash")) {
          puts(":::: Using dHashSpace");
          space = dHashSpaceCreate (0);
      } else if (argv[i] == std::string("sap")) {
          puts(":::: Using dSweepAndPruneSpace");
          space = dSweepAndPruneSpaceCreate (0, dSAP_AXES_XYZ);
      } else if (argv[i] == std::string("simple")) {
          puts(":::: Using dSimpleSpace");
          space = dSimpleSpaceCreate(0);
      }
  }
  if (!space) {
      puts(":::: You can specify 'quad', 'hash', 'sap' or 'simple' in the");
      puts(":::: command line to specify the type of space.");
      puts(":::: Using SAP space by default.");
      space = dSweepAndPruneSpaceCreate (0, dSAP_AXES_XYZ);
  }

  contactgroup = dJointGroupCreate (0);
  dWorldSetGravity (world,0,0,-0.5);
  dWorldSetCFM (world,1e-5);
  dCreatePlane (space,0,0,1,0);
  memset (obj,0,sizeof(obj));

  for (int i = 0; i < NUM; i++){
	command('s');
  }

  // run simulation
  dsSimulationLoop (argc,argv,352,288,&fn);

  dJointGroupDestroy (contactgroup);
  dSpaceDestroy (space);
  dWorldDestroy (world);
  dCloseODE();
  return 0;
}