"""Tests for configuration validation and core.config helpers."""

import pytest

from core.config import (
    OWS_REFERENCE_CACHE_TTL_MAX_SECONDS,
    _int_env_in_range,
    _max_content_length_bytes,
)

# Pure-unit tests: no Flask app or DB, so opt out of the DB-vendor gate.
pytestmark = pytest.mark.no_db


@pytest.fixture(autouse=True)
def test_app_in_context():
    """No-op override: these tests don't need a DB-backed app context."""
    yield


@pytest.fixture(autouse=True)
def test_app_request():
    """No-op override: these tests don't need a request context."""
    yield


def test_accepts_limits_within_the_supported_range():
    """The min (1), the default (2), and the max (10) MB are all accepted and returned in bytes."""
    assert _max_content_length_bytes('1') == 1 * 1024 * 1024
    assert _max_content_length_bytes('2') == 2 * 1024 * 1024
    assert _max_content_length_bytes('10') == 10 * 1024 * 1024


def test_rejects_a_limit_below_one_mb():
    """A sub-1MB ceiling would shrink the abuse backstop to near nothing, so it fails fast."""
    with pytest.raises(ValueError, match='between 1 and 10'):
        _max_content_length_bytes('0')


def test_rejects_a_limit_above_ten_mb():
    """A ceiling over 10MB balloons per-thread memory under 15 threads, so it fails fast."""
    with pytest.raises(ValueError, match='between 1 and 10'):
        _max_content_length_bytes('11')


def test_returns_default_when_unset():
    """The default is parsed when the env var is absent."""
    assert _int_env_in_range('OWS_UNSET_TEST_VAR', '300', 0, 86400) == 300


def test_returns_env_value_in_range(monkeypatch):
    """An in-range env value is returned as an int."""
    monkeypatch.setenv('OWS_RANGE_TEST_VAR', '600')
    assert _int_env_in_range('OWS_RANGE_TEST_VAR', '300', 0, 86400) == 600


def test_boundaries_are_inclusive(monkeypatch):
    """Both the minimum and maximum are accepted."""
    monkeypatch.setenv('OWS_RANGE_TEST_VAR', '0')
    assert _int_env_in_range('OWS_RANGE_TEST_VAR', '300', 0, 86400) == 0
    monkeypatch.setenv('OWS_RANGE_TEST_VAR', '86400')
    assert _int_env_in_range('OWS_RANGE_TEST_VAR', '300', 0, 86400) == 86400


def test_raises_above_maximum(monkeypatch):
    """A value above the maximum fails loudly."""
    monkeypatch.setenv('OWS_RANGE_TEST_VAR', '999999')
    with pytest.raises(ValueError, match='between 0 and 86400'):
        _int_env_in_range('OWS_RANGE_TEST_VAR', '300', 0, 86400)


def test_raises_below_minimum(monkeypatch):
    """A negative value fails loudly."""
    monkeypatch.setenv('OWS_RANGE_TEST_VAR', '-1')
    with pytest.raises(ValueError, match='between 0 and 86400'):
        _int_env_in_range('OWS_RANGE_TEST_VAR', '300', 0, 86400)


def test_raises_on_non_integer(monkeypatch):
    """A non-integer value fails loudly."""
    monkeypatch.setenv('OWS_RANGE_TEST_VAR', 'not-a-number')
    with pytest.raises(ValueError, match='must be an integer'):
        _int_env_in_range('OWS_RANGE_TEST_VAR', '300', 0, 86400)


def test_reference_cache_ttl_max_constant():
    """The reference-cache TTL ceiling is 24 hours."""
    assert OWS_REFERENCE_CACHE_TTL_MAX_SECONDS == 86400