"""!

@brief Unit-tests for BSAS algorithm.

@authors Andrei Novikov (pyclustering@yandex.ru)
@date 2014-2020
@copyright BSD-3-Clause

"""

import unittest

# Generate images without having a window appear.
import matplotlib
matplotlib.use('Agg')

from pyclustering.cluster.tests.bsas_templates import bsas_test_template

from pyclustering.cluster.bsas import bsas
from pyclustering.utils.metric import type_metric, distance_metric

from pyclustering.samples.definitions import SIMPLE_SAMPLES


class bsas_unit_test(unittest.TestCase):
    def testClusteringSampleSimple1(self):
        bsas_test_template.clustering(SIMPLE_SAMPLES.SAMPLE_SIMPLE1, 2, 1.0, [5, 5], False)
        bsas_test_template.clustering(SIMPLE_SAMPLES.SAMPLE_SIMPLE1, 10, 1.0, [5, 5], False)
        bsas_test_template.clustering(SIMPLE_SAMPLES.SAMPLE_SIMPLE1, 2, 10.0, [10], False)
        bsas_test_template.clustering(SIMPLE_SAMPLES.SAMPLE_SIMPLE1, 1, 1.0, [10], False)

    def testClusteringSampleSimple1Euclidean(self):
        bsas_test_template.clustering(SIMPLE_SAMPLES.SAMPLE_SIMPLE1, 2, 1.0, [5, 5], False, metric=distance_metric(type_metric.EUCLIDEAN))
        bsas_test_template.clustering(SIMPLE_SAMPLES.SAMPLE_SIMPLE1, 2, 10.0, [10], False, metric=distance_metric(type_metric.EUCLIDEAN))

    def testClusteringSampleSimple1EuclideanSquare(self):
        bsas_test_template.clustering(SIMPLE_SAMPLES.SAMPLE_SIMPLE1, 2, 1.0, [5, 5], False, metric=distance_metric(type_metric.EUCLIDEAN_SQUARE))
        bsas_test_template.clustering(SIMPLE_SAMPLES.SAMPLE_SIMPLE1, 2, 10.0, [5, 5], False, metric=distance_metric(type_metric.EUCLIDEAN_SQUARE))
        bsas_test_template.clustering(SIMPLE_SAMPLES.SAMPLE_SIMPLE1, 2, 100.0, [10], False, metric=distance_metric(type_metric.EUCLIDEAN_SQUARE))

    def testClusteringSampleSimple1Manhattan(self):
        bsas_test_template.clustering(SIMPLE_SAMPLES.SAMPLE_SIMPLE1, 2, 1.0, [5, 5], False, metric=distance_metric(type_metric.MANHATTAN))
        bsas_test_template.clustering(SIMPLE_SAMPLES.SAMPLE_SIMPLE1, 2, 10.0, [10], False, metric=distance_metric(type_metric.MANHATTAN))

    def testClusteringSampleSimple1Chebyshev(self):
        bsas_test_template.clustering(SIMPLE_SAMPLES.SAMPLE_SIMPLE1, 2, 1.0, [5, 5], False, metric=distance_metric(type_metric.CHEBYSHEV))
        bsas_test_template.clustering(SIMPLE_SAMPLES.SAMPLE_SIMPLE1, 2, 10.0, [10], False, metric=distance_metric(type_metric.CHEBYSHEV))

    def testClusteringSampleSimple2(self):
        bsas_test_template.clustering(SIMPLE_SAMPLES.SAMPLE_SIMPLE2, 3, 1.0, [5, 8, 10], False)
        bsas_test_template.clustering(SIMPLE_SAMPLES.SAMPLE_SIMPLE2, 3, 10.0, [23], False)

    def testClusteringSampleSimple3(self):
        bsas_test_template.clustering(SIMPLE_SAMPLES.SAMPLE_SIMPLE3, 4, 1.0, [2, 8, 20, 30], False)
        bsas_test_template.clustering(SIMPLE_SAMPLES.SAMPLE_SIMPLE3, 4, 2.0, [8, 10, 12, 30], False)
        bsas_test_template.clustering(SIMPLE_SAMPLES.SAMPLE_SIMPLE3, 4, 10.0, [60], False)

    def testOneDimentionalPoints1(self):
        bsas_test_template.clustering(SIMPLE_SAMPLES.SAMPLE_SIMPLE7, 2, 1.0, [10, 10], False)
        bsas_test_template.clustering(SIMPLE_SAMPLES.SAMPLE_SIMPLE7, 2, 10.0, [20], False)

    def testOneDimentionalPoints2(self):
        bsas_test_template.clustering(SIMPLE_SAMPLES.SAMPLE_SIMPLE9, 2, 1.0, [10, 20], False)
        bsas_test_template.clustering(SIMPLE_SAMPLES.SAMPLE_SIMPLE9, 2, 10.0, [30], False)

    def testThreeDimentionalPoints(self):
        bsas_test_template.clustering(SIMPLE_SAMPLES.SAMPLE_SIMPLE11, 2, 1.0, [10, 10], False)
        bsas_test_template.clustering(SIMPLE_SAMPLES.SAMPLE_SIMPLE11, 2, 10.0, [20], False)

    def testTheSamePoints1(self):
        bsas_test_template.clustering(SIMPLE_SAMPLES.SAMPLE_SIMPLE12, 3, 1.0, [5, 5, 5], False)
        bsas_test_template.clustering(SIMPLE_SAMPLES.SAMPLE_SIMPLE12, 30, 1.0, [5, 5, 5], False)
        bsas_test_template.clustering(SIMPLE_SAMPLES.SAMPLE_SIMPLE12, 3, 10.0, [15], False)
        bsas_test_template.clustering(SIMPLE_SAMPLES.SAMPLE_SIMPLE12, 1, 1.0, [15], False)

    def testTheSamePoints2(self):
        bsas_test_template.clustering(SIMPLE_SAMPLES.SAMPLE_SIMPLE9, 3, 1.0, [10, 20], False)
        bsas_test_template.clustering(SIMPLE_SAMPLES.SAMPLE_SIMPLE9, 3, 10.0, [30], False)

    def testVisulizeNoFailure(self):
        bsas_test_template.visualizing(SIMPLE_SAMPLES.SAMPLE_SIMPLE1, 2, 1.0, False)
        bsas_test_template.visualizing(SIMPLE_SAMPLES.SAMPLE_SIMPLE7, 2, 1.0, False)
        bsas_test_template.visualizing(SIMPLE_SAMPLES.SAMPLE_SIMPLE11, 2, 1.0, False)


    def test_incorrect_data(self):
        self.assertRaises(ValueError, bsas, [], 1, 1.0)

    def test_incorrect_amount_clusters(self):
        self.assertRaises(ValueError, bsas, [[0], [1], [2]], 0, 1.0)

    def test_incorrect_threshold_dissimilarity(self):
        self.assertRaises(ValueError, bsas, [[0], [1], [2]], 1, -1.0)