import numpy as np
import pytest

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


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


class TestInterval:
    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):
        msg = (
            "'<' not supported between instances of "
            "'pandas._libs.interval.Interval' and 'int'"
        )
        with pytest.raises(TypeError, match=msg):
            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

    @pytest.mark.parametrize(
        "left, right, expected",
        [
            ("2017-01-01", "2017-01-06", "5 days"),
            ("2017-01-01", "2017-01-01 12:00:00", "12 hours"),
            ("2017-01-01 12:00", "2017-01-01 12:00:00", "0 days"),
            ("2017-01-01 12:01", "2017-01-05 17:31:00", "4 days 5 hours 30 min"),
        ],
    )
    @pytest.mark.parametrize("tz", (None, "UTC", "CET", "US/Eastern"))
    def test_length_timestamp(self, tz, left, right, expected):
        # GH 18789
        iv = Interval(Timestamp(left, tz=tz), Timestamp(right, tz=tz))
        result = iv.length
        expected = Timedelta(expected)
        assert result == expected

    @pytest.mark.parametrize(
        "left, right",
        [
            (0, 1),
            (Timedelta("0 days"), Timedelta("1 day")),
            (Timestamp("2018-01-01"), Timestamp("2018-01-02")),
            (
                Timestamp("2018-01-01", tz="US/Eastern"),
                Timestamp("2018-01-02", tz="US/Eastern"),
            ),
        ],
    )
    def test_is_empty(self, left, right, closed):
        # GH27219
        # non-empty always return False
        iv = Interval(left, right, closed)
        assert iv.is_empty is False

        # same endpoint is empty except when closed='both' (contains one point)
        iv = Interval(left, left, closed)
        result = iv.is_empty
        expected = closed != "both"
        assert result is expected

    @pytest.mark.parametrize(
        "left, right",
        [
            ("a", "z"),
            (("a", "b"), ("c", "d")),
            (list("AB"), list("ab")),
            (Interval(0, 1), Interval(1, 2)),
            (Period("2018Q1", freq="Q"), Period("2018Q1", freq="Q")),
        ],
    )
    def test_construct_errors(self, left, right):
        # GH 23013
        msg = "Only numeric, Timestamp and Timedelta endpoints are allowed"
        with pytest.raises(ValueError, match=msg):
            Interval(left, right)

    def test_math_add(self, closed):
        interval = Interval(0, 1, closed=closed)
        expected = Interval(1, 2, closed=closed)

        result = interval + 1
        assert result == expected

        result = 1 + interval
        assert result == expected

        result = interval
        result += 1
        assert result == expected

        msg = r"unsupported operand type\(s\) for \+"
        with pytest.raises(TypeError, match=msg):
            interval + interval

        with pytest.raises(TypeError, match=msg):
            interval + "foo"

    def test_math_sub(self, closed):
        interval = Interval(0, 1, closed=closed)
        expected = Interval(-1, 0, closed=closed)

        result = interval - 1
        assert result == expected

        result = interval
        result -= 1
        assert result == expected

        msg = r"unsupported operand type\(s\) for -"
        with pytest.raises(TypeError, match=msg):
            interval - interval

        with pytest.raises(TypeError, match=msg):
            interval - "foo"

    def test_math_mult(self, closed):
        interval = Interval(0, 1, closed=closed)
        expected = Interval(0, 2, closed=closed)

        result = interval * 2
        assert result == expected

        result = 2 * interval
        assert result == expected

        result = interval
        result *= 2
        assert result == expected

        msg = r"unsupported operand type\(s\) for \*"
        with pytest.raises(TypeError, match=msg):
            interval * interval

        msg = r"can\'t multiply sequence by non-int"
        with pytest.raises(TypeError, match=msg):
            interval * "foo"

    def test_math_div(self, closed):
        interval = Interval(0, 1, closed=closed)
        expected = Interval(0, 0.5, closed=closed)

        result = interval / 2.0
        assert result == expected

        result = interval
        result /= 2.0
        assert result == expected

        msg = r"unsupported operand type\(s\) for /"
        with pytest.raises(TypeError, match=msg):
            interval / interval

        with pytest.raises(TypeError, match=msg):
            interval / "foo"

    def test_math_floordiv(self, closed):
        interval = Interval(1, 2, closed=closed)
        expected = Interval(0, 1, closed=closed)

        result = interval // 2
        assert result == expected

        result = interval
        result //= 2
        assert result == expected

        msg = r"unsupported operand type\(s\) for //"
        with pytest.raises(TypeError, match=msg):
            interval // interval

        with pytest.raises(TypeError, match=msg):
            interval // "foo"

    def test_constructor_errors(self):
        msg = "invalid option for 'closed': foo"
        with pytest.raises(ValueError, match=msg):
            Interval(0, 1, closed="foo")

        msg = "left side of interval must be <= right side"
        with pytest.raises(ValueError, match=msg):
            Interval(1, 0)

    @pytest.mark.parametrize(
        "tz_left, tz_right", [(None, "UTC"), ("UTC", None), ("UTC", "US/Eastern")]
    )
    def test_constructor_errors_tz(self, tz_left, tz_right):
        # GH 18538
        left = Timestamp("2017-01-01", tz=tz_left)
        right = Timestamp("2017-01-02", tz=tz_right)

        if com.any_none(tz_left, tz_right):
            error = TypeError
            msg = "Cannot compare tz-naive and tz-aware timestamps"
        else:
            error = ValueError
            msg = "left and right must have the same time zone"
        with pytest.raises(error, match=msg):
            Interval(left, right)