import importlib
import importlib.util
import sys
import unittest
import unittest.mock as mock

from ansible.errors import AnsibleError

from . import PROJECT_ROOT


def _load_module(rel_path: str, name: str):
    """Import ``rel_path`` fresh, evicting sibling-test stubs of
    ``utils.roles.applications.config`` from ``sys.modules`` first.
    """
    for key in (
        "utils.roles.applications.config",
        "utils.roles.applications",
        "utils",
        "utils.cache.applications",
        "utils.cache",
    ):
        sys.modules.pop(key, None)
    importlib.import_module("utils.roles.applications.config")
    importlib.import_module("utils.cache.applications")

    path = PROJECT_ROOT / rel_path
    spec = importlib.util.spec_from_file_location(name, str(path))
    mod = importlib.util.module_from_spec(spec)
    assert spec and spec.loader
    spec.loader.exec_module(mod)
    return mod


def _apps(*, oidc_enabled=True, ldap_enabled=None, flavor=None, include_app=True):
    """Build a minimal merged `applications` dict for the Nextcloud role.

    `oidc_enabled` defaults to True so existing flavor-selection tests
    stay focused on the ldap/flavor axis. The OIDC-off fast-path has
    its own dedicated tests.
    """
    if not include_app:
        return {}
    sso_block: dict = {"enabled": oidc_enabled}
    if flavor is not None:
        sso_block["oidc"] = {"plugin": flavor}
    services_block: dict = {"sso": sso_block}
    if ldap_enabled is not None:
        services_block["ldap"] = {"enabled": ldap_enabled}
    return {
        "web-app-nextcloud": {
            "services": services_block,
        },
    }


class OidcFlavorLookupTests(unittest.TestCase):
    @classmethod
    def setUpClass(cls):
        cls.mod = _load_module(
            "plugins/lookup/sso_oidc_plugin.py",
            "sso_oidc_plugin",
        )

    def setUp(self):
        self._patcher = mock.patch.object(self.mod, "lookup_loader")
        self._loader_mock = self._patcher.start()
        self._stub_payload = None
        self._loader_mock.get.side_effect = self._stub_lookup

    def _stub_lookup(self, name, *_args, **_kwargs):
        """Stand in for the lookups the plugin consumes.

        ``config`` resolves a dotted path against the payload the way
        ``lookup('config', app, path, default)`` does with a default supplied;
        anything else answers with the payload itself.
        """
        if name == "config":
            return mock.MagicMock(
                run=lambda terms, **_kw: [self._stub_config(*terms)],
            )
        return mock.MagicMock(run=lambda *_a, **_kw: [self._stub_payload])

    def _stub_config(self, application_id, config_path, default=None):
        node = (self._stub_payload or {}).get(application_id)
        for part in str(config_path).split("."):
            if not isinstance(node, dict) or part not in node:
                return default
            node = node[part]
        return node

    def tearDown(self):
        self._patcher.stop()

    def _run(self, applications, *, terms=None):
        self._stub_payload = applications
        lk = self.mod.LookupModule()
        lk._loader = mock.MagicMock()
        return lk.run(terms or [], variables={"applications": applications})

    def test_ldap_enabled_returns_oidc_login(self):
        self.assertEqual(
            self._run(_apps(ldap_enabled=True)),
            ["oidc_login"],
        )

    def test_ldap_disabled_returns_sociallogin(self):
        self.assertEqual(
            self._run(_apps(ldap_enabled=False)),
            ["sociallogin"],
        )

    def test_ldap_missing_defaults_to_sociallogin(self):
        self.assertEqual(
            self._run(_apps()),
            ["sociallogin"],
        )

    def test_missing_application_returns_empty(self):
        self.assertEqual(
            self._run({"some-other-app": {}}),
            [""],
        )

    def test_oidc_disabled_returns_empty(self):
        self.assertEqual(
            self._run(_apps(oidc_enabled=False)),
            [""],
        )
        self.assertEqual(
            self._run(_apps(oidc_enabled=False, ldap_enabled=True)),
            [""],
        )
        self.assertEqual(
            self._run(_apps(oidc_enabled=False, flavor="oidc_login")),
            [""],
        )

    def test_explicit_flavor_overrides_ldap_fallback(self):
        self.assertEqual(
            self._run(_apps(ldap_enabled=True, flavor="sociallogin")),
            ["sociallogin"],
        )
        self.assertEqual(
            self._run(_apps(ldap_enabled=False, flavor="user_oidc")),
            ["user_oidc"],
        )

    def test_explicit_flavor_is_stripped(self):
        self.assertEqual(
            self._run(_apps(ldap_enabled=False, flavor="  oidc_login  ")),
            ["oidc_login"],
        )

    def test_blank_explicit_flavor_falls_back_to_ternary(self):
        self.assertEqual(
            self._run(_apps(ldap_enabled=True, flavor="   ")),
            ["oidc_login"],
        )
        self.assertEqual(
            self._run(_apps(ldap_enabled=False, flavor="")),
            ["sociallogin"],
        )

    def test_null_explicit_flavor_falls_back_to_ternary(self):
        self.assertEqual(
            self._run(_apps(ldap_enabled=True, flavor=None)),
            ["oidc_login"],
        )

    def test_non_string_explicit_flavor_is_ignored(self):
        self.assertEqual(
            self._run(_apps(ldap_enabled=True, flavor=42)),
            ["oidc_login"],
        )

    def test_rejects_positional_terms(self):
        lk = self.mod.LookupModule()
        with self.assertRaises(AnsibleError):
            lk.run(["unexpected"], variables={"applications": _apps()})


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