"""Test utility functions."""

from datetime import date, datetime, timedelta, timezone

import pytest
from agenda.utils import as_date, as_datetime, human_readable_delta
from freezegun import freeze_time


def test_as_date_with_datetime() -> None:
    """Test converting a datetime object to a date."""
    dt = datetime(2024, 7, 7, 12, 0, 0, tzinfo=timezone.utc)
    result = as_date(dt)
    assert result == date(2024, 7, 7)


def test_as_date_with_date() -> None:
    """Test passing a date object through as_date."""
    d = date(2024, 7, 7)
    result = as_date(d)
    assert result == d


def test_as_date_with_invalid_type() -> None:
    """Test as_date with an invalid type, expecting a TypeError."""
    with pytest.raises(TypeError):
        as_date("2024-07-07")


def test_as_datetime_with_datetime() -> None:
    """Test passing a datetime object through as_datetime."""
    dt = datetime(2024, 7, 7, 12, 0, 0, tzinfo=timezone.utc)
    result = as_datetime(dt)
    assert result == dt


def test_as_datetime_with_date() -> None:
    """Test converting a date object to a datetime."""
    d = date(2024, 7, 7)
    result = as_datetime(d)
    expected = datetime(2024, 7, 7, 0, 0, 0, tzinfo=timezone.utc)
    assert result == expected


def test_as_datetime_with_invalid_type() -> None:
    """Test as_datetime with an invalid type, expecting a TypeError."""
    with pytest.raises(TypeError):
        as_datetime("2024-07-07")


@freeze_time("2024-07-01")
def test_human_readable_delta_future_date() -> None:
    """Test human_readable_delta with a future date 45 days from today."""
    future_date = date.today() + timedelta(days=45)
    result = human_readable_delta(future_date)
    assert result == "1 month 2 weeks 1 day"


@freeze_time("2024-07-01")
def test_human_readable_delta_today() -> None:
    """Test human_readable_delta with today's date, expecting None."""
    today = date.today()
    result = human_readable_delta(today)
    assert result is None


@freeze_time("2024-07-01")
def test_human_readable_delta_past_date() -> None:
    """Test human_readable_delta with a past date, expecting None."""
    past_date = date.today() - timedelta(days=1)
    result = human_readable_delta(past_date)
    assert result is None


@freeze_time("2024-07-01")
def test_human_readable_delta_months_only() -> None:
    """Test human_readable_delta with a future date 60 days from today."""
    future_date = date.today() + timedelta(days=60)
    result = human_readable_delta(future_date)
    assert result == "2 months"


@freeze_time("2024-07-01")
def test_human_readable_delta_weeks_only() -> None:
    """Test human_readable_delta with a future date 14 days from today."""
    future_date = date.today() + timedelta(days=14)
    result = human_readable_delta(future_date)
    assert result == "2 weeks"


@freeze_time("2024-07-01")
def test_human_readable_delta_days_only() -> None:
    """Test human_readable_delta with a future date 3 days from today."""
    future_date = date.today() + timedelta(days=3)
    result = human_readable_delta(future_date)
    assert result == "3 days"