"""Regression tests for the _debug_enabled helper.

`app.cm_api` defines a private _debug_enabled() function that parses the
CM_DEBUG environment variable. This test runs a parametrized matrix
against it. Historically `app.cm_web_view` had its own copy that this
suite kept in lockstep — that module retired in the B4 cutover, leaving
only cm_api as the consumer. The matrix-style harness stays so the next
Flask entrypoint can be wired in by appending one line to HELPER_MODULES.
"""

import os
import unittest
from unittest import mock

# Import the module at top-level (before any mock.patch.dict with
# clear=True), so module-load-time os.getenv() reads see the real
# environment. The patches inside individual tests then only affect the
# helper's runtime read of CM_DEBUG.
import app.cm_api


# Modules expected to expose a private _debug_enabled() helper.
# Add new entries here if more Flask entrypoints adopt the same toggle.
HELPER_MODULES = (
    app.cm_api,
)


# (env_value, expected_result). env_value=None means CM_DEBUG is unset.
CASES = (
    (None, False),
    ("", False),
    ("false", False),
    ("False", False),
    ("FALSE", False),
    ("0", False),
    ("no", False),
    ("anything-else", False),
    ("true", True),
    ("True", True),
    ("TRUE", True),
    ("1", True),
    ("yes", True),
    ("YES", True),
    ("  true  ", True),
)


class DebugEnabledTests(unittest.TestCase):
    def _resolve(self, module):
        return getattr(module, "_debug_enabled", None)

    def test_helper_exists_on_every_module(self):
        for module in HELPER_MODULES:
            with self.subTest(module=module.__name__):
                helper = self._resolve(module)
                self.assertTrue(
                    callable(helper),
                    f"{module.__name__}._debug_enabled must be callable",
                )

    def test_parses_cm_debug_consistently(self):
        for module in HELPER_MODULES:
            helper = self._resolve(module)
            if helper is None:
                self.fail(
                    f"{module.__name__}._debug_enabled is missing — "
                    "make test_helper_exists_on_every_module pass first"
                )
            for env_value, expected in CASES:
                with self.subTest(module=module.__name__, env=env_value):
                    env = {} if env_value is None else {"CM_DEBUG": env_value}
                    with mock.patch.dict(os.environ, env, clear=True):
                        self.assertEqual(
                            helper(),
                            expected,
                            f"{module.__name__}._debug_enabled() should be "
                            f"{expected!r} for CM_DEBUG={env_value!r}",
                        )


if __name__ == "__main__":
    unittest.main()