import numpy as np
from fielddisplay import fielddisplay
from checkfield import checkfield
from WriteData import WriteData
from project3d import project3d

class SMBforcing(object):
	"""
	SMBforcing Class definition

	   Usage:
	      SMB=SMBforcing();
	"""

	def __init__(self): # {{{
		self.mass_balance = float('NaN')
		self.requested_outputs      = []
		#}}}
	def __repr__(self): # {{{
		string="   surface forcings parameters:"
		string="%s\n%s"%(string,fielddisplay(self,'mass_balance','surface mass balance [m/yr ice eq]'))
		string="%s\n%s"%(string,fielddisplay(self,'requested_outputs','additional outputs requested'))
		return string
		#}}}
	def extrude(self,md): # {{{

		self.mass_balance=project3d(md,'vector',self.mass_balance,'type','node');
		return self
	#}}}
	def defaultoutputs(self,md): # {{{
		return []
	#}}}
	def initialize(self,md): # {{{

		if np.all(np.isnan(self.mass_balance)):
			self.mass_balance=np.zeros((md.mesh.numberofvertices))
			print "      no SMBforcing.mass_balance specified: values set as zero"

		return self
	#}}}
	def checkconsistency(self,md,solution,analyses):    # {{{

		if 'MasstransportAnalysis' in analyses:
			md = checkfield(md,'fieldname','smb.mass_balance','timeseries',1,'NaN',1,'Inf',1)

		if 'BalancethicknessAnalysis' in analyses:
			md = checkfield(md,'fieldname','smb.mass_balance','size',[md.mesh.numberofvertices],'NaN',1,'Inf',1)

		md = checkfield(md,'fieldname','masstransport.requested_outputs','stringrow',1)
		return md
	# }}}
	def marshall(self,prefix,md,fid):    # {{{

		yts=md.constants.yts

		WriteData(fid,prefix,'name','md.smb.model','data',1,'format','Integer');
		WriteData(fid,prefix,'object',self,'class','smb','fieldname','mass_balance','format','DoubleMat','mattype',1,'scale',1./yts,'timeserieslength',md.mesh.numberofvertices+1,'yts',md.constants.yts)
		
		#process requested outputs
		outputs = self.requested_outputs
		indices = [i for i, x in enumerate(outputs) if x == 'default']
		if len(indices) > 0:
			outputscopy=outputs[0:max(0,indices[0]-1)]+self.defaultoutputs(md)+outputs[indices[0]+1:]
			outputs    =outputscopy
		WriteData(fid,prefix,'data',outputs,'name','md.smb.requested_outputs','format','StringArray')

	# }}}
