text: /**
   * Copyright (c) 2006-2016 LOVE Development Team
   *
   * This software is provided 'as-is', without any express or implied
   * warranty.  In no event will the authors be held liable for any damages
   * arising from the use of this software.
   *
   * Permission is granted to anyone to use this software for any purpose,
   * including commercial applications, and to alter it and redistribute it
   * freely, subject to the following restrictions:
   *
   * 1. The origin of this software must not be misrepresented; you must not
   *    claim that you wrote the original software. If you use this software
   *    in a product, an acknowledgment in the product documentation would be
   *    appreciated but is not required.
   * 2. Altered source versions must be plainly marked as such, and must not be
   *    misrepresented as being the original software.
   * 3. This notice may not be removed or altered from any source distribution.
   **/
  
  // MOON
  #include "moon/physics/box2d/wrap_Joint.h"
  #include "moon/StringMap.h"
  #include "moon/physics/box2d/Body.h"
  
  namespace moon
  {
  namespace physics
  {
  namespace box2d
  {
  
  void luax_pushjoint(lua_State *L, Joint *j)
  {
  	if (j == nullptr)
  		return lua_pushnil(L);
  
  	switch (j->getType())
  	{
  	case Joint::JOINT_DISTANCE:
  		return luax_pushtype(L, PHYSICS_DISTANCE_JOINT_ID, j);
  	case Joint::JOINT_REVOLUTE:
  		return luax_pushtype(L, PHYSICS_REVOLUTE_JOINT_ID, j);
  	case Joint::JOINT_PRISMATIC:
  		return luax_pushtype(L, PHYSICS_PRISMATIC_JOINT_ID, j);
  	case Joint::JOINT_MOUSE:
  		return luax_pushtype(L, PHYSICS_MOUSE_JOINT_ID, j);
  	case Joint::JOINT_PULLEY:
  		return luax_pushtype(L, PHYSICS_PULLEY_JOINT_ID, j);
  	case Joint::JOINT_GEAR:
  		return luax_pushtype(L, PHYSICS_GEAR_JOINT_ID, j);
  	case Joint::JOINT_FRICTION:
  		return luax_pushtype(L, PHYSICS_FRICTION_JOINT_ID, j);
  	case Joint::JOINT_WELD:
  		return luax_pushtype(L, PHYSICS_WELD_JOINT_ID, j);
  	case Joint::JOINT_WHEEL:
  		return luax_pushtype(L, PHYSICS_WHEEL_JOINT_ID, j);
  	case Joint::JOINT_ROPE:
  		return luax_pushtype(L, PHYSICS_ROPE_JOINT_ID, j);
  	case Joint::JOINT_MOTOR:
  		return luax_pushtype(L, PHYSICS_MOTOR_JOINT_ID, j);
  	default:
  		return lua_pushnil(L);
  	}
  }
  
  Joint *luax_checkjoint(lua_State *L, int idx)
  {
  	Joint *t = luax_checktype<Joint>(L, idx, PHYSICS_JOINT_ID);
  	if (!t->isValid())
  		luaL_error(L, "Attempt to use destroyed joint.");
  	return t;
  }
  
  int w_Joint_getType(lua_State *L)
  {
  	Joint *t = luax_checkjoint(L, 1);
  	const char *type = "";
  	Joint::getConstant(t->getType(), type);
  	lua_pushstring(L, type);
  	return 1;
  }
  
  int w_Joint_getBodies(lua_State *L)
  {
  	Joint *t = luax_checkjoint(L, 1);
  	Body *b1 = nullptr;
  	Body *b2 = nullptr;
  
  	luax_catchexcept(L, [&]() {
  		b1 = t->getBodyA();
  		b2 = t->getBodyB();
  	});
  
  	luax_pushtype(L, PHYSICS_BODY_ID, b1);
  	luax_pushtype(L, PHYSICS_BODY_ID, b2);
  	return 2;
  }
  
  int w_Joint_getAnchors(lua_State *L)
  {
  	Joint *t = luax_checkjoint(L, 1);
  	lua_remove(L, 1);
  	return t->getAnchors(L);
  }
  
  int w_Joint_getReactionForce(lua_State *L)
  {
  	Joint *t = luax_checkjoint(L, 1);
  	lua_remove(L, 1);
  	return t->getReactionForce(L);
  }
  
  int w_Joint_getReactionTorque(lua_State *L)
  {
  	Joint *t = luax_checkjoint(L, 1);
  	float inv_dt = (float)luaL_checknumber(L, 2);
  	lua_pushnumber(L, t->getReactionTorque(inv_dt));
  	return 1;
  }
  
  int w_Joint_getCollideConnected(lua_State *L)
  {
  	Joint *t = luax_checkjoint(L, 1);
  	luax_pushboolean(L, t->getCollideConnected());
  	return 1;
  }
  
  int w_Joint_setUserData(lua_State *L)
  {
  	Joint *t = luax_checkjoint(L, 1);
  	lua_remove(L, 1);
  	return t->setUserData(L);
  }
  
  int w_Joint_getUserData(lua_State *L)
  {
  	Joint *t = luax_checkjoint(L, 1);
  	lua_remove(L, 1);
  	return t->getUserData(L);
  }
  
  int w_Joint_destroy(lua_State *L)
  {
  	Joint *t = luax_checkjoint(L, 1);
  	luax_catchexcept(L, [&](){ t->destroyJoint(); });
  	return 0;
  }
  
  int w_Joint_isDestroyed(lua_State *L)
  {
  	Joint *t = luax_checktype<Joint>(L, 1, PHYSICS_JOINT_ID);
  	luax_pushboolean(L, !t->isValid());
  	return 1;
  }
  
  const luaL_Reg w_Joint_functions[] =
  {
  	{ "getType", w_Joint_getType },
  	{ "getBodies", w_Joint_getBodies },
  	{ "getAnchors", w_Joint_getAnchors },
  	{ "getReactionForce", w_Joint_getReactionForce },
  	{ "getReactionTorque", w_Joint_getReactionTorque },
  	{ "getCollideConnected", w_Joint_getCollideConnected },
  	{ "setUserData", w_Joint_setUserData },
  	{ "getUserData", w_Joint_getUserData },
  	{ "destroy", w_Joint_destroy },
  	{ "isDestroyed", w_Joint_isDestroyed },
  	{ 0, 0 }
  };
  
  extern "C" int luaopen_joint(lua_State *L)
  {
  	return luax_register_type(L, PHYSICS_JOINT_ID, "Joint", w_Joint_functions, nullptr);
  }
  
  } // box2d
  } // physics
  } // moon
  