import numpy
from pairoptions import pairoptions

def project3d(md,*args):
	"""
	PROJECT3D - vertically project a vector from 2d mesh

	   vertically project a vector from 2d mesh (split in noncoll and coll areas) into a 3d mesh.
	   This vector can be a node vector of size (md.mesh.numberofvertices2d,N/A) or an 
	   element vector of size (md.mesh.numberofelements2d,N/A). 
	   arguments: 
	      'vector': 2d vector
	      'type': 'element' or 'node'. 
	   options: 
	      'layer' a layer number where vector should keep its values. If not specified, all layers adopt the 
	             value of the 2d vector.
	      'padding': default to 0 (value adopted by other 3d layers not being projected

	   Examples:
	      extruded_vector=project3d(md,'vector',vector2d,'type','node','layer',1,'padding',NaN)
	      extruded_vector=project3d(md,'vector',vector2d,'type','element','padding',0)
	      extruded_vector=project3d(md,'vector',vector2d,'type','node')
	"""

	#some regular checks
	if not md:
		raise TypeError("bad usage")
	if md.mesh.domaintype().lower() != '3d':
		raise TypeError("input model is not 3d")

	#retrieve parameters from options.
	options      = pairoptions(*args)
	vector2d     = options.getfieldvalue('vector')       #mandatory
	vectype      = options.getfieldvalue('type')         #mandatory
	layer        = options.getfieldvalue('layer',0)      #optional (do all layers otherwise)
	paddingvalue = options.getfieldvalue('padding',0)    #0 by default

	vector1d=False
	if isinstance(vector2d,numpy.ndarray) and numpy.ndim(vector2d)==1:
		vector1d=True
		vector2d=vector2d.reshape(-1,1)

	if isinstance(vector2d,(bool,int,long,float)) or numpy.size(vector2d)==1:
		projected_vector=vector2d

	elif vectype.lower()=='node':

		#Initialize 3d vector
		if vector2d.shape[0]==md.mesh.numberofvertices2d:
			projected_vector=(paddingvalue*numpy.ones((md.mesh.numberofvertices,  numpy.size(vector2d,axis=1)))).astype(vector2d.dtype)
		elif vector2d.shape[0]==md.mesh.numberofvertices2d+1:
			projected_vector=(paddingvalue*numpy.ones((md.mesh.numberofvertices+1,numpy.size(vector2d,axis=1)))).astype(vector2d.dtype)
			projected_vector[-1,:]=vector2d[-1,:]
			vector2d=vector2d[:-1,:]
		else:
			raise TypeError("vector length not supported")

		#Fill in
		if layer==0:
			for i in xrange(md.mesh.numberoflayers):
				projected_vector[(i*md.mesh.numberofvertices2d):((i+1)*md.mesh.numberofvertices2d),:]=vector2d
		else:
			projected_vector[((layer-1)*md.mesh.numberofvertices2d):(layer*md.mesh.numberofvertices2d),:]=vector2d

	elif vectype.lower()=='element':

		#Initialize 3d vector
		if vector2d.shape[0]==md.mesh.numberofelements2d:
			projected_vector=(paddingvalue*numpy.ones((md.mesh.numberofelements,  numpy.size(vector2d,axis=1)))).astype(vector2d.dtype)
		elif vector2d.shape[0]==md.mesh.numberofelements2d+1:
			projected_vector=(paddingvalue*numpy.ones((md.mesh.numberofelements+1,numpy.size(vector2d,axis=1)))).astype(vector2d.dtype)
			projected_vector[-1,:]=vector2d[-1,:]
			vector2d=vector2d[:-1,:]
		else:
			raise TypeError("vector length not supported")

		#Fill in
		if layer==0:
			for i in xrange(md.mesh.numberoflayers-1):
				projected_vector[(i*md.mesh.numberofelements2d):((i+1)*md.mesh.numberofelements2d),:]=vector2d
		else:
			projected_vector[((layer-1)*md.mesh.numberofelements2d):(layer*md.mesh.numberofelements2d),:]=vector2d

	else:
		raise TypeError("project3d error message: unknown projection type")

	if vector1d:
		projected_vector=projected_vector.reshape(-1,)

	return projected_vector
