#   scipy-yli: Helpful SciPy utilities and recipes
#   Copyright © 2022–2023  Lee Yingtong Li (RunasSudo)
#
#   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.
#
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#   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.
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from pytest import approx

import pandas as pd

import yli

def test_kaplanmeier_simple():
	"""Compare yli.kaplanmeier for simple example"""
	
	df = pd.DataFrame({
		'SurvTime': [2, 4, 6, 8],
		'Status': [True, True, True, True]
	})
	
	xpoints, ypoints, _, _ = yli.survival.calc_survfunc_kaplanmeier(df['SurvTime'], df['Status'], False)
	
	assert xpoints[0] == 0
	assert ypoints[0] == 1
	
	assert xpoints[1] == 2
	assert ypoints[1] == 1
	
	assert xpoints[2] == 2
	assert ypoints[2] == 0.75
	
	assert xpoints[3] == 4
	assert ypoints[3] == 0.75
	
	assert xpoints[4] == 4
	assert ypoints[4] == approx(0.5)
	
	assert xpoints[5] == 6
	assert ypoints[5] == approx(0.5)
	
	assert xpoints[6] == 6
	assert ypoints[6] == approx(0.25)
	
	assert xpoints[7] == 8
	assert ypoints[7] == approx(0.25)
	
	assert xpoints[8] == 8
	assert ypoints[8] == 0