/**
 * $Id$
 * ***** BEGIN GPL LICENSE BLOCK *****
 *
 * 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 2
 * 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, write to the Free Software Foundation,
 * Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 * The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
 * All rights reserved.
 *
 * The Original Code is: all of this file.
 *
 * Contributor(s): none yet.
 *
 * ***** END GPL LICENSE BLOCK *****
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#ifdef WIN32

#pragma warning (disable : 4786)
#endif

#include "KX_Light.h"
#include "KX_Camera.h"
#include "RAS_IRasterizer.h"
#include "RAS_IRenderTools.h"

#include "KX_PyMath.h"

#include "DNA_object_types.h"
#include "GPU_material.h"
 
KX_LightObject::KX_LightObject(void* sgReplicationInfo,SG_Callbacks callbacks,
							   class RAS_IRenderTools* rendertools,
							   const RAS_LightObject&	lightobj,
							   bool glsl,
							   PyTypeObject* T
							   )
 :
	KX_GameObject(sgReplicationInfo,callbacks,T),
		m_rendertools(rendertools)
{
	m_lightobj = lightobj;
	m_lightobj.m_worldmatrix = GetOpenGLMatrixPtr();
	m_lightobj.m_scene = sgReplicationInfo;
	m_rendertools->AddLight(&m_lightobj);
	m_glsl = glsl;
	m_blenderscene = ((KX_Scene*)sgReplicationInfo)->GetBlenderScene();
};


KX_LightObject::~KX_LightObject()
{
	GPULamp *lamp;

	if((lamp = GetGPULamp())) {
		float obmat[4][4] = {{0}};
		GPU_lamp_update(lamp, 0, obmat);
	}

	m_rendertools->RemoveLight(&m_lightobj);
}


CValue*		KX_LightObject::GetReplica()
{

	KX_LightObject* replica = new KX_LightObject(*this);

	replica->ProcessReplica();
	
	replica->m_lightobj.m_worldmatrix = replica->GetOpenGLMatrixPtr();
	m_rendertools->AddLight(&replica->m_lightobj);

	return replica;
}

GPULamp *KX_LightObject::GetGPULamp()
{
	if(m_glsl)
		return GPU_lamp_from_blender(m_blenderscene, GetBlenderObject(), GetBlenderGroupObject());
	else
		return false;
}

void KX_LightObject::Update()
{
	GPULamp *lamp;

	if((lamp = GetGPULamp()) != NULL && GetSGNode()) {
		float obmat[4][4];
		// lights don't get their openGL matrix updated, do it now
		if (GetSGNode()->IsDirty())
			GetOpenGLMatrix();
		double *dobmat = GetOpenGLMatrixPtr()->getPointer();

		for(int i=0; i<4; i++)
			for(int j=0; j<4; j++, dobmat++)
				obmat[i][j] = (float)*dobmat;

		GPU_lamp_update(lamp, m_lightobj.m_layer, obmat);
		GPU_lamp_update_colors(lamp, m_lightobj.m_red, m_lightobj.m_green, 
			m_lightobj.m_blue, m_lightobj.m_energy);
	}
}

bool KX_LightObject::HasShadowBuffer()
{
	GPULamp *lamp;

	if((lamp = GetGPULamp()))
		return GPU_lamp_has_shadow_buffer(lamp);
	else
		return false;
}

int KX_LightObject::GetShadowLayer()
{
	GPULamp *lamp;

	if((lamp = GetGPULamp()))
		return GPU_lamp_shadow_layer(lamp);
	else
		return 0;
}

void KX_LightObject::BindShadowBuffer(RAS_IRasterizer *ras, KX_Camera *cam, MT_Transform& camtrans)
{
	GPULamp *lamp;
	float viewmat[4][4], winmat[4][4];
	int winsize;

	/* bind framebuffer */
	lamp = GetGPULamp();
	GPU_lamp_shadow_buffer_bind(lamp, viewmat, &winsize, winmat);

	/* setup camera transformation */
	MT_Matrix4x4 modelviewmat((float*)viewmat);
	MT_Matrix4x4 projectionmat((float*)winmat);

	MT_Transform trans = MT_Transform((float*)viewmat);
	camtrans.invert(trans);

	cam->SetModelviewMatrix(modelviewmat);
	cam->SetProjectionMatrix(projectionmat);
	
	cam->NodeSetLocalPosition(camtrans.getOrigin());
	cam->NodeSetLocalOrientation(camtrans.getBasis());
	cam->NodeUpdateGS(0);

	/* setup rasterizer transformations */
	ras->SetProjectionMatrix(projectionmat);
	ras->SetViewMatrix(modelviewmat, cam->NodeGetWorldOrientation(), cam->NodeGetWorldPosition(), cam->GetCameraData()->m_perspective);
}

void KX_LightObject::UnbindShadowBuffer(RAS_IRasterizer *ras)
{
	GPULamp *lamp = GetGPULamp();
	GPU_lamp_shadow_buffer_unbind(lamp);
}

/* ------------------------------------------------------------------------- */
/* Python Integration Hooks					                                 */
/* ------------------------------------------------------------------------- */

PyObject* KX_LightObject::py_getattro_dict() {
	py_getattro_dict_up(KX_GameObject);
}


PyTypeObject KX_LightObject::Type = {
#if (PY_VERSION_HEX >= 0x02060000)
	PyVarObject_HEAD_INIT(NULL, 0)
#else
	/* python 2.5 and below */
	PyObject_HEAD_INIT( NULL )  /* required py macro */
	0,                          /* ob_size */
#endif
		"KX_LightObject",
		sizeof(PyObjectPlus_Proxy),
		0,
		py_base_dealloc,
		0,
		0,
		0,
		0,
		py_base_repr,
		0,0,
		&KX_GameObject::Mapping,
		0,0,0,
		py_base_getattro,
		py_base_setattro,
		0,0,0,0,0,0,0,0,0,
		Methods
};

PyParentObject KX_LightObject::Parents[] = {
	&KX_LightObject::Type,
	&KX_GameObject::Type,
		&SCA_IObject::Type,
		&CValue::Type,
		NULL
};

PyMethodDef KX_LightObject::Methods[] = {
	{NULL,NULL} //Sentinel
};

PyAttributeDef KX_LightObject::Attributes[] = {
	KX_PYATTRIBUTE_INT_RW("layer", 1, 20, true, KX_LightObject, m_lightobj.m_layer),
	KX_PYATTRIBUTE_FLOAT_RW("energy", 0, 10, KX_LightObject, m_lightobj.m_energy),
	KX_PYATTRIBUTE_FLOAT_RW("distance", 0.01, 5000, KX_LightObject, m_lightobj.m_distance),
	KX_PYATTRIBUTE_RW_FUNCTION("color", KX_LightObject, pyattr_get_color, pyattr_set_color),
	KX_PYATTRIBUTE_RW_FUNCTION("colour", KX_LightObject, pyattr_get_color, pyattr_set_color),
	KX_PYATTRIBUTE_FLOAT_RW("lin_attenuation", 0, 1, KX_LightObject, m_lightobj.m_att1),
	KX_PYATTRIBUTE_FLOAT_RW("quad_attenuation", 0, 1, KX_LightObject, m_lightobj.m_att2),
	KX_PYATTRIBUTE_FLOAT_RW("spotsize", 1, 180, KX_LightObject, m_lightobj.m_spotsize),
	KX_PYATTRIBUTE_FLOAT_RW("spotblend", 0, 1, KX_LightObject, m_lightobj.m_spotblend),
	KX_PYATTRIBUTE_RO_FUNCTION("SPOT", KX_LightObject, pyattr_get_typeconst),
	KX_PYATTRIBUTE_RO_FUNCTION("SUN", KX_LightObject, pyattr_get_typeconst),
	KX_PYATTRIBUTE_RO_FUNCTION("NORMAL", KX_LightObject, pyattr_get_typeconst),
	KX_PYATTRIBUTE_RW_FUNCTION("type", KX_LightObject, pyattr_get_type, pyattr_set_type),
	{ NULL }	//Sentinel
};

PyObject* KX_LightObject::pyattr_get_color(void *self_v, const KX_PYATTRIBUTE_DEF *attrdef)
{
	KX_LightObject* self = static_cast<KX_LightObject*>(self_v);
	return Py_BuildValue("[fff]", self->m_lightobj.m_red, self->m_lightobj.m_green, self->m_lightobj.m_blue);
}

int KX_LightObject::pyattr_set_color(void *self_v, const KX_PYATTRIBUTE_DEF *attrdef, PyObject *value)
{
	KX_LightObject* self = static_cast<KX_LightObject*>(self_v);

	MT_Vector3 color;
	if (PyVecTo(value, color))
	{
		self->m_lightobj.m_red = color[0];
		self->m_lightobj.m_green = color[1];
		self->m_lightobj.m_blue = color[2];
		return PY_SET_ATTR_SUCCESS;
	}
	return PY_SET_ATTR_FAIL;
}

PyObject* KX_LightObject::pyattr_get_typeconst(void *self_v, const KX_PYATTRIBUTE_DEF *attrdef)
{
	PyObject* retvalue;

	const char* type = attrdef->m_name;

	if(strcmp(type, "SPOT")) {
		retvalue = PyInt_FromLong(RAS_LightObject::LIGHT_SPOT);
	} else if (strcmp(type, "SUN")) {
		retvalue = PyInt_FromLong(RAS_LightObject::LIGHT_SUN);
	} else if (strcmp(type, "NORMAL")) {
		retvalue = PyInt_FromLong(RAS_LightObject::LIGHT_NORMAL);
	}

	return retvalue;
}

PyObject* KX_LightObject::pyattr_get_type(void* self_v, const KX_PYATTRIBUTE_DEF *attrdef)
{
	KX_LightObject* self = static_cast<KX_LightObject*>(self_v);
	return PyInt_FromLong(self->m_lightobj.m_type);
}

int KX_LightObject::pyattr_set_type(void* self_v, const KX_PYATTRIBUTE_DEF *attrdef, PyObject* value)
{
	KX_LightObject* self = static_cast<KX_LightObject*>(self_v);
	int val = PyInt_AsLong(value);
	if((val==-1 && PyErr_Occurred()) || val<0 || val>2) {
		PyErr_SetString(PyExc_ValueError, "light.type= val: KX_LightObject, expected an int between 0 and 2");
		return PY_SET_ATTR_FAIL;
	}
	
	switch(val) {
		case 0:
			self->m_lightobj.m_type = self->m_lightobj.LIGHT_SPOT;
			break;
		case 1:
			self->m_lightobj.m_type = self->m_lightobj.LIGHT_SUN;
			break;
		case 2:
			self->m_lightobj.m_type = self->m_lightobj.LIGHT_NORMAL;
			break;
	}

	return PY_SET_ATTR_SUCCESS;
}


PyObject* KX_LightObject::py_getattro(PyObject *attr)
{
	py_getattro_up(KX_GameObject);
}

int KX_LightObject::py_setattro(PyObject *attr, PyObject *value)
{
	py_setattro_up(KX_GameObject);
}