import importlib.util
import unittest
from unittest.mock import patch

from ansible.errors import AnsibleError

from . import PROJECT_ROOT


def _load_module(rel_path: str, name: str):
    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


class _TlsResolveStub:
    def __init__(self, enabled: bool, mode: str):
        self._enabled = enabled
        self._mode = mode

    def run(self, terms, variables=None, **kwargs):
        return [{"enabled": self._enabled, "mode": self._mode}]


class _DomainsResolveStub:
    def run(self, terms, variables=None, **kwargs):
        return [(variables or {}).get("domains", {})]


class TestComposeFArgs(unittest.TestCase):
    def setUp(self):
        self.m = _load_module(
            "plugins/lookup/compose_file_args.py",
            "compose_file_args_mod",
        )
        self.lookup = self.m.LookupModule()

        self.lookup._loader = object()
        self.lookup._templar = object()

        self.vars = {
            "DIR_COMPOSITIONS": "/x/",
            "domains": {
                "web-app-a": "example.invalid",
            },
        }

    def _loader_dispatch(self, tls_stub):
        # "domains" resolves through variables['domains'] to keep tests hermetic;
        # "tls" resolves through the per-test stub.
        def _get(name, *args, **kwargs):
            if name == "domains":
                return _DomainsResolveStub()
            if name == "tls":
                return tls_stub
            raise AssertionError(f"unexpected lookup name: {name}")

        return _get

    def _stub_get_docker_paths(self, application_id: str, base_dir: str) -> dict:
        self.assertEqual(application_id, "web-app-a")
        self.assertEqual(base_dir, "/x/")
        return {
            "files": {
                "compose": "/x/compose.yml",
                "compose_override": "/x/compose.override.yml",
                "compose_ca_override": "/x/compose.ca.override.yml",
            }
        }

    def test_includes_base_and_override_when_role_provides_override_and_tls_off(self):
        with (
            patch.object(
                self.m, "get_docker_paths", side_effect=self._stub_get_docker_paths
            ),
            patch.object(self.m, "_role_provides_override", return_value=True),
            patch.object(
                self.m.lookup_loader,
                "get",
                side_effect=self._loader_dispatch(_TlsResolveStub(False, "off")),
            ),
        ):
            out = self.lookup.run(["web-app-a"], variables=self.vars)[0]

        self.assertEqual(out, "-f /x/compose.yml -f /x/compose.override.yml")

    def test_flag_kwarg_emits_compose_file_for_stack_deploy(self):
        with (
            patch.object(
                self.m, "get_docker_paths", side_effect=self._stub_get_docker_paths
            ),
            patch.object(self.m, "_role_provides_override", return_value=True),
            patch.object(
                self.m.lookup_loader,
                "get",
                side_effect=self._loader_dispatch(_TlsResolveStub(False, "off")),
            ),
        ):
            out = self.lookup.run(
                ["web-app-a"], variables=self.vars, flag="--compose-file"
            )[0]

        self.assertEqual(
            out, "--compose-file /x/compose.yml --compose-file /x/compose.override.yml"
        )

    def test_invalid_flag_rejected(self):
        with self.assertRaises(AnsibleError):
            self.lookup.run(["web-app-a"], variables=self.vars, flag="-bad")

    def test_includes_ca_override_when_self_signed_and_domain_exists(self):
        with (
            patch.object(
                self.m, "get_docker_paths", side_effect=self._stub_get_docker_paths
            ),
            patch.object(self.m, "_role_provides_override", return_value=True),
            patch.object(
                self.m.lookup_loader,
                "get",
                side_effect=self._loader_dispatch(_TlsResolveStub(True, "self_signed")),
            ),
        ):
            out = self.lookup.run(["web-app-a"], variables=self.vars)[0]

        self.assertEqual(
            out,
            "-f /x/compose.yml -f /x/compose.override.yml -f /x/compose.ca.override.yml",
        )

    def test_fails_when_ca_override_missing_but_required(self):
        def stub_missing_ca(application_id: str, base_dir: str) -> dict:
            return {
                "files": {
                    "compose": "/x/compose.yml",
                    "compose_override": "/x/compose.override.yml",
                    "compose_ca_override": "",
                }
            }

        with (
            patch.object(self.m, "get_docker_paths", side_effect=stub_missing_ca),
            patch.object(self.m, "_role_provides_override", return_value=True),
            patch.object(
                self.m.lookup_loader,
                "get",
                side_effect=self._loader_dispatch(_TlsResolveStub(True, "self_signed")),
            ),
            self.assertRaises(AnsibleError),
        ):
            self.lookup.run(["web-app-a"], variables=self.vars)

    def test_includes_only_base_when_role_does_not_provide_override(self):
        with (
            patch.object(
                self.m, "get_docker_paths", side_effect=self._stub_get_docker_paths
            ),
            patch.object(self.m, "_role_provides_override", return_value=False),
            patch.object(
                self.m.lookup_loader,
                "get",
                side_effect=self._loader_dispatch(_TlsResolveStub(False, "off")),
            ),
        ):
            out = self.lookup.run(["web-app-a"], variables=self.vars)[0]

        self.assertEqual(out, "-f /x/compose.yml")

    def test_requires_one_term(self):
        with self.assertRaises(AnsibleError):
            self.lookup.run([], variables=self.vars)
        with self.assertRaises(AnsibleError):
            self.lookup.run(["a", "b"], variables=self.vars)

    def test_requires_path_docker_compose_instances(self):
        with self.assertRaises(AnsibleError):
            self.lookup.run(
                ["web-app-a"], variables={"domains": {"web-app-a": "example.invalid"}}
            )

    def test_requires_docker_compose_structure_from_get_docker_paths(self):
        with (
            patch.object(self.m, "get_docker_paths", return_value="nope"),
            self.assertRaises(AnsibleError),
        ):
            self.lookup.run(["web-app-a"], variables=self.vars)

        with (
            patch.object(self.m, "get_docker_paths", return_value={}),
            self.assertRaises(AnsibleError),
        ):
            self.lookup.run(["web-app-a"], variables=self.vars)

        with (
            patch.object(self.m, "get_docker_paths", return_value={"files": "nope"}),
            self.assertRaises(AnsibleError),
        ):
            self.lookup.run(["web-app-a"], variables=self.vars)


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