"""
    Unit tests for fitting module 
"""
import unittest
from sans.guitools.plottables import Theory1D
from sans.guitools.plottables import Data1D
from sans.fit.AbstractFitEngine import Data, Model
import math
from sans.fit.Fitting import Fit
from DataLoader.loader import Loader

class testFitModule(unittest.TestCase):
    """ test fitting """
    def test_park(self):
        """ Simple cylinder model fit (park)  """
        
        out=Loader().load("cyl_400_20.txt")
        data1 = Data1D(x=out.x, y=out.y, dx=out.dx, dy=out.y)
        
        fitter = Fit('park')
        # Receives the type of model for the fitting
        from sans.models.CylinderModel import CylinderModel
        model1  = CylinderModel()
        model1.setParam('contrast', 1)
        data = Data(sans_data=data1)
        model = Model(model1)
        
        pars1 =['length','radius','scale']
        fitter.set_data(data,1)
        model.set( scale=1e-10 )
        fitter.set_model(model,1,pars1)
        fitter.select_problem_for_fit(Uid=1,value=1)
        result1 = fitter.fit()
        
        self.assert_(result1)
        self.assertTrue(len(result1.pvec)>0 or len(result1.pvec)==0 )
        self.assertTrue(len(result1.stderr)> 0 or len(result1.stderr)==0)
        
        #print result1.pvec[0]-400.0, result1.pvec[0]
        #print math.fabs(result1.pvec[0]-400.0)/3.0
        self.assertTrue( math.fabs(result1.pvec[0]-400.0)/3.0 < result1.stderr[0] )
        self.assertTrue( math.fabs(result1.pvec[1]-20.0)/3.0  < result1.stderr[1] )
        self.assertTrue( math.fabs(result1.pvec[2]-9.0e-12)/3.0   < result1.stderr[2] )
        self.assertTrue( result1.fitness < 1.0 )