# -*- coding: utf-8 -*-
"""
This program has been developed by students from the bachelor Computer Science at Utrecht
University within the Software Project course.
© Copyright Utrecht University (Department of Information and Computing Sciences)
"""

from robot_interface.utils.get_config import get_config


def test_get_config_prefers_explicit_value(monkeypatch):
    """
    When a direct value is provided it should be returned without reading the environment.
    """
    monkeypatch.setenv("GET_CONFIG_TEST", "from-env")

    result = get_config("explicit", "GET_CONFIG_TEST", "default")

    assert result == "explicit"


def test_get_config_returns_env_value(monkeypatch):
    """
    If value is None the environment variable should be used.
    """
    monkeypatch.setenv("GET_CONFIG_TEST", "from-env")

    result = get_config(None, "GET_CONFIG_TEST", "default")

    assert result == "from-env"


def test_get_config_casts_env_value(monkeypatch):
    """
    The env value should be cast when a cast function is provided.
    """
    monkeypatch.setenv("GET_CONFIG_PORT", "1234")

    result = get_config(None, "GET_CONFIG_PORT", 0, int)

    assert result == 1234


def test_get_config_casts_default_when_env_missing(monkeypatch):
    """
    When the env var is missing it should fall back to the default and still apply the cast.
    """
    monkeypatch.delenv("GET_CONFIG_MISSING", raising=False)

    result = get_config(None, "GET_CONFIG_MISSING", "42", int)

    assert result == 42