#! /usr/bin/env python

import openturns as ot

ot.TESTPREAMBLE()

# Dimension of the input model
# Size of the TimeGrid
size = 64
dimension = 1
timeGrid = ot.RegularGrid(0.0, 0.1, size)
amplitude = ot.Point(dimension, 2.0)
scale = ot.Point(dimension, 1.0)
model = ot.CauchyModel(scale, amplitude)
myProcess = ot.SpectralGaussianProcess(model, timeGrid)

# Create a Process sample
N = 100
sample = ot.ProcessSample(myProcess.getSample(N))

# Filtering Windows
myFactory = ot.WelchFactory()

# Build a UserDefinedSpectralModel using the Wellch method
mySpectralModel = myFactory.buildAsUserDefinedSpectralModel(sample)

# Get the frequency grid of the model
myFrequencyGrid = mySpectralModel.getFrequencyGrid()
for i in range(dimension):
    for j in range(dimension):
        print("Spectre ", i, "-", j)
        for k in range(myFrequencyGrid.getN()):
            frequency = myFrequencyGrid.getStart() + k * myFrequencyGrid.getStep()
            estimatedValue = (mySpectralModel(frequency)[i, j]).real
            modelValue = (model(frequency)[i, j]).real
            print(
                "Frequency =  %.6f" % frequency,
                ", evaluation = %.8f" % estimatedValue,
                " model = %.8f" % modelValue,
            )

# Create a Time Series
timeSeries = myProcess.getRealization()

# Build a UserDefinedSpectralModel using the Wellch method
mySpectralModel2 = myFactory.buildAsUserDefinedSpectralModel(timeSeries)

# Get the frequency grid of the model
myFrequencyGrid = mySpectralModel2.getFrequencyGrid()
for i in range(dimension):
    for j in range(dimension):
        print("Spectre ", i, "-", j)
        for k in range(myFrequencyGrid.getN()):
            frequency = myFrequencyGrid.getStart() + k * myFrequencyGrid.getStep()
            estimatedValue = (mySpectralModel2(frequency)[i, j]).real
            modelValue = (model(frequency)[i, j]).real
            print(
                "Frequency =  %.6f" % frequency,
                ", evaluation = %.8f" % estimatedValue,
                " model = %.8f" % modelValue,
            )