# PySoy's bodies.Light class
#
# Copyright (C) 2006,2007,2008 PySoy Group
#
#  This program is free software; you can redistribute it and/or modify
#  it under the terms of the GNU Affero General Public License as published
#  by the Free Software Foundation, either version 3 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 Affero General Public License for more details.
#
#  You should have received a copy of the GNU Affero General Public License
#  along with this program; if not, see http://www.gnu.org/licenses
#
# $Id$

cdef class Light (Body) :
  '''soy.bodies.Light

    Lights provide illumination in your scene.  Needs more work.
  '''

  ############################################################################
  #
  # Python Functions
  #

  def __cinit__(self, scene=None,
                radius=180.0, ambient=None, diffuse=None, specular=None,
                *args, **keywords) :
    self.radius   = radius
    self.ambient  = ambient
    self.mass = 0
    self.diffuse  = diffuse
    self.specular = specular
    if self._scene is not None :
      self._scene._lights._append(<void*> self)


  ############################################################################
  #
  # Properties
  #

  property ambient :
    def __get__(self) :
      return self._ambient

    def __set__(self, value) :
      if value == None :
        from soy.colors import black
        self._ambient = black
      elif isinstance(value, soy.colors.Color) :
        self._ambient = value
      else :
        raise TypeError('color must be an instance of soy.colors.Color')


  property diffuse :
    def __get__(self) :
      return self._diffuse

    def __set__(self, value) :
      if value == None :
        from soy.colors import gray
        self._diffuse = gray
      elif isinstance(value, soy.colors.Color) :
        self._diffuse = value
      else :
        raise TypeError('color must be an instance of soy.colors.Color')


  property radius :
    def __get__(self) :
      return self._radius

    def __set__(self, value) :
      if type(value) != float and type(value) != int :
        raise TypeError('Light.radius must be a float or int')
      if value < 0.0 or value > 180.0 :
        raise ValueError('Light.radius must be 0.0 - 180.0')
      self._radius = value


  property specular :
    def __get__(self) :
      return self._specular

    def __set__(self, value) :
      if value == None :
        from soy.colors import white
        self._specular = white
      elif isinstance(value, soy.colors.Color) :
        self._specular = value
      else :
        raise TypeError('color must be an instance of soy.colors.Color')


  ############################################################################
  #
  # General C Functions
  #

  cdef void _append(self) :
    #
    # this overrides Body._append to also append self to self._scene._lights 
    #
    self._scene._bodies._append(<void*> self)
    self._scene._lights._append(<void*> self)
    #
    ######################################


  cdef void _remove(self) :
    #
    # this overrides Body._remove to also remove self from self._scene._lights 
    #
    self._scene._bodies._remove(<void*> self)
    self._scene._lights._remove(<void*> self)
    #
    ######################################


  ############################################################################
  #
  # WindowLoop Functions
  #

  cdef void _on(self, int _id) nogil :
    cdef gl.GLfloat _position[4]
    #
    # we do this only because glLightfv takes four parameters
    _position[0] = self._position[0]
    _position[1] = self._position[1]
    _position[2] = self._position[2]
    _position[3] = 1.0
    #
    # enable the light of the given _id
    gl.glEnable(_id)
    gl.glLightfv(_id, gl.GL_AMBIENT,
                 (<soy.colors.Color> self._ambient)._rgba)
    gl.glLightfv(_id, gl.GL_DIFFUSE,
                 (<soy.colors.Color> self._diffuse)._rgba)
    gl.glLightfv(_id, gl.GL_SPECULAR,
                 (<soy.colors.Color> self._specular)._rgba)
    gl.glLightfv(_id, gl.GL_POSITION, _position)
    #
    # for spotlights
    gl.glLightf (_id, gl.GL_SPOT_CUTOFF, self._radius)
    #if self._radius != 180.0 :
      # TODO, Ticket #947 :
      # gl.glLightf (_id, gl.GL_SPOT_EXPODENT, [[0-128, default 0]])
      # gl.glLightfv(_id, gl.GL_SPOT_DIRECTION, [[direction, as per Body]])


  cdef void _off(self, int _id) nogil :
    gl.glDisable(_id)