# -*- coding: utf-8 -*-
# This file is part of pygal
#
# A python svg graph plotting library
# Copyright © 2012-2015 Kozea
#
# This library is free software: you can redistribute it and/or modify it under
# the terms of the GNU Lesser General Public License as published by the Free
# Software Foundation, either version 3 of the License, or (at your option) any
# later version.
#
# This library is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
# details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with pygal. If not, see <http://www.gnu.org/licenses/>.

"""Box chart related tests"""

from pygal.graph.box import Box


def test_quartiles():
    """Test box points for the 1.5IQR computation method"""
    a = [-2.0, 3.0, 4.0, 5.0, 8.0]  # odd test data
    (min_s, q0, q1, q2, q3, q4, max_s), outliers = Box._box_points(
        a, mode='1.5IQR')

    assert q1 == 7.0 / 4.0
    assert q2 == 4.0
    assert q3 == 23 / 4.0
    assert q0 == 7.0 / 4.0 - 6.0  # q1 - 1.5 * iqr
    assert q4 == 23 / 4.0 + 6.0  # q3 + 1.5 * iqr

    b = [1.0, 4.0, 6.0, 8.0]  # even test data
    (min_s, q0, q1, q2, q3, q4, max_s), outliers = Box._box_points(
        b, mode='1.5IQR')

    assert q2 == 5.0

    c = [2.0, None, 4.0, 6.0, None]  # odd with None elements
    (min_s, q0, q1, q2, q3, q4, max_s), outliers = Box._box_points(
        c, mode='1.5IQR')

    assert q2 == 4.0

    d = [4]
    (min_s, q0, q1, q2, q3, q4, max_s), outliers = Box._box_points(
        d, mode='1.5IQR')

    assert q0 == 4
    assert q1 == 4
    assert q2 == 4
    assert q3 == 4
    assert q4 == 4


def test_quartiles_min_extremes():
    """Test box points for the extremes computation method"""
    a = [-2.0, 3.0, 4.0, 5.0, 8.0]  # odd test data
    (min_s, q0, q1, q2, q3, q4, max_s), outliers = Box._box_points(
        a, mode='extremes')

    assert q1 == 7.0 / 4.0
    assert q2 == 4.0
    assert q3 == 23 / 4.0
    assert q0 == -2.0  # min
    assert q4 == 8.0  # max

    b = [1.0, 4.0, 6.0, 8.0]  # even test data
    (min_s, q0, q1, q2, q3, q4, max_s), outliers = Box._box_points(
        b, mode='extremes')

    assert q2 == 5.0

    c = [2.0, None, 4.0, 6.0, None]  # odd with None elements
    (min_s, q0, q1, q2, q3, q4, max_s), outliers = Box._box_points(
        c, mode='extremes')

    assert q2 == 4.0

    d = [4]
    (min_s, q0, q1, q2, q3, q4, max_s), outliers = Box._box_points(
        d, mode='extremes')

    assert q0 == 4
    assert q1 == 4
    assert q2 == 4
    assert q3 == 4
    assert q4 == 4


def test_quartiles_tukey():
    """Test box points for the tukey computation method"""
    a = []  # empty data
    (min_s, q0, q1, q2, q3, q4, max_s), outliers = Box._box_points(
        a, mode='tukey')
    assert min_s == q0 == q1 == q2 == q3 == q4 == 0
    assert outliers == []

    # https://en.wikipedia.org/wiki/Quartile example 1
    b = [6, 7, 15, 36, 39, 40, 41, 42, 43, 47, 49]
    (min_s, q0, q1, q2, q3, q4, max_s), outliers = Box._box_points(
        b, mode='tukey')
    assert min_s == q0 == 6
    assert q1 == 20.25
    assert q2 == 40
    assert q3 == 42.75
    assert max_s == q4 == 49
    assert outliers == []

    # previous test with added outlier 75
    c = [6, 7, 15, 36, 39, 40, 41, 42, 43, 47, 49, 75]
    (min_s, q0, q1, q2, q3, q4, max_s), outliers = Box._box_points(
        c, mode='tukey')
    assert min_s == q0 == 6
    assert q1 == 25.5
    assert q2 == (40 + 41) / 2.0
    assert q3 == 45
    assert max_s == 75
    assert outliers == [75]

    # one more outlier, 77
    c = [6, 7, 15, 36, 39, 40, 41, 42, 43, 47, 49, 75, 77]
    (min_s, q0, q1, q2, q3, q4, max_s), outliers = Box._box_points(
        c, mode='tukey')
    assert min_s == q0 == 6
    assert q1 == 30.75
    assert q2 == 41
    assert q3 == 47.5
    assert max_s == 77
    assert 75 in outliers
    assert 77 in outliers


def test_quartiles_stdev():
    """Test box points for the stdev computation method"""
    a = [35, 42, 35, 41, 36, 6, 12, 51, 33, 27, 46, 36, 44, 53, 75, 46, 16,
         51, 45, 29, 25, 26, 54, 61, 27, 40, 23, 34, 51, 37]
    SD = 14.67
    (min_s, q0, q1, q2, q3, q4, max_s), outliers = Box._box_points(
        a, mode='stdev')
    assert min_s == min(a)
    assert max_s == max(a)
    assert q2 == 36.5
    assert q4 <= q2 + SD
    assert q0 >= q2 - SD
    assert all(n in outliers for n in [6, 12, 16, 53, 54, 61, 75])

    b = [5]  # test for posible zero division
    (min_s, q0, q1, q2, q3, q4, max_s), outliers = Box._box_points(
        b, mode='stdev')
    assert min_s == q0 == q1 == q2 == q3 == q4 == max_s == b[0]
    assert outliers == []


def test_simple_box():
    """Simple box test"""
    box = Box()
    box.add('test1', [-1, 2, 3, 3.1, 3.2, 4, 5])
    box.add('test2', [2, 3, 5, 6, 6, 4])
    box.title = 'Box test'
    q = box.render_pyquery()

    assert len(q(".axis.y")) == 1
    assert len(q(".legend")) == 2
    assert len(q(".plot .series rect")) == 2
