"""Unit tests for the minimum_period_between_exacerbations function."""

import copd
import pandas as pd
import pytest


@pytest.mark.parametrize("input_values,expected_output",
                         [(pd.DataFrame({'DaysSinceLastExac': [-1]}), 0),
                          (pd.DataFrame({'DaysSinceLastExac': [7]}), 1),
                          (pd.DataFrame({'DaysSinceLastExac': [14]}), 1),
                          (pd.DataFrame({'DaysSinceLastExac': [20]}), 0)])
def test_threshold_equals_default(input_values, expected_output):
    """Test output for a variety of input values.

    Test cases cover:
        1. No previous exacerbation
        2. Very recent exac
        3. Exac on the threshold value (should count as too recent)
        4. Previous non-recent exac
       for the default threshold of 14 days
    """
    assert copd.minimum_period_between_exacerbations(input_values) == expected_output


@pytest.mark.parametrize("input_values,expected_output",
                         [(pd.DataFrame({'DaysSinceLastExac': [-1]}), 0),
                          (pd.DataFrame({'DaysSinceLastExac': [6]}), 1),
                          (pd.DataFrame({'DaysSinceLastExac': [7]}), 1),
                          (pd.DataFrame({'DaysSinceLastExac': [14]}), 0)])
def test_threshold_equals_seven(input_values, expected_output):
    """Test output for a variety of input values.

    Test cases cover:
        1. No previous exacerbation
        2. Very recent exac
        3. Exac on the threshold value (should count as too recent)
        4. Previous non-recent exac
    for a threshold of 7 days.
    """
    assert copd.minimum_period_between_exacerbations(
        input_values, minimum_days=7) == expected_output