from __future__ import division

import numpy as np
import pytest

from pandas import Interval, Timedelta, Timestamp
import pandas.core.common as com


@pytest.fixture
def interval():
    return Interval(0, 1)


class TestInterval(object):

    def test_properties(self, interval):
        assert interval.closed == 'right'
        assert interval.left == 0
        assert interval.right == 1
        assert interval.mid == 0.5

    def test_repr(self, interval):
        assert repr(interval) == "Interval(0, 1, closed='right')"
        assert str(interval) == "(0, 1]"

        interval_left = Interval(0, 1, closed='left')
        assert repr(interval_left) == "Interval(0, 1, closed='left')"
        assert str(interval_left) == "[0, 1)"

    def test_contains(self, interval):
        assert 0.5 in interval
        assert 1 in interval
        assert 0 not in interval

        msg = "__contains__ not defined for two intervals"
        with pytest.raises(TypeError, match=msg):
            interval in interval

        interval_both = Interval(0, 1, closed='both')
        assert 0 in interval_both
        assert 1 in interval_both

        interval_neither = Interval(0, 1, closed='neither')
        assert 0 not in interval_neither
        assert 0.5 in interval_neither
        assert 1 not in interval_neither

    def test_equal(self):
        assert Interval(0, 1) == Interval(0, 1, closed='right')
        assert Interval(0, 1) != Interval(0, 1, closed='left')
        assert Interval(0, 1) != 0

    def test_comparison(self):
        with pytest.raises(TypeError, match='unorderable types'):
            Interval(0, 1) < 2

        assert Interval(0, 1) < Interval(1, 2)
        assert Interval(0, 1) < Interval(0, 2)
        assert Interval(0, 1) < Interval(0.5, 1.5)
        assert Interval(0, 1) <= Interval(0, 1)
        assert Interval(0, 1) > Interval(-1, 2)
        assert Interval(0, 1) >= Interval(0, 1)

    def test_hash(self, interval):
        # should not raise
        hash(interval)

    @pytest.mark.parametrize('left, right, expected', [
        (0, 5, 5),
        (-2, 5.5, 7.5),
        (10, 10, 0),
        (10, np.inf, np.inf),
        (-np.inf, -5, np.inf),
        (-np.inf, np.inf, np.inf),
        (Timedelta('0 days'), Timedelta('5 days'), Timedelta('5 days')),
        (Timedelta('10 days'), Timedelta('10 days'), Timedelta('0 days')),
        (Timedelta('1H10M'), Timedelta('5H5M'), Timedelta('3H55M')),
        (Timedelta('5S'), Timedelta('1H'), Timedelta('59M55S'))])
    def test_length(self, left, right, expected):
        # GH 18789
        iv = Interval(left, right)
        result = iv.length
        assert result == expected