"""Unit tests for the admin API Lambda authorizer (INFRA-100)."""

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

import pytest

# Make the shared layer importable (conftest also does this, but keep explicit).
_shared = os.path.join(os.path.dirname(__file__), os.pardir, "src", "shared")
sys.path.insert(0, os.path.abspath(_shared))

# Do NOT set GOOGLE_CLIENT_ID_PARAM at module scope — test_submit_order relies
# on it defaulting to "" globally. Each test below patches it explicitly.
os.environ.setdefault("TABLE_NAME", "meal-order-manager-orders-test")

_handler_path = os.path.join(
    os.path.dirname(__file__), os.pardir, "functions", "admin_authorizer", "handler.py"
)
_spec = importlib.util.spec_from_file_location(
    "admin_authorizer_handler", os.path.abspath(_handler_path)
)
authorizer = importlib.util.module_from_spec(_spec)
sys.modules["admin_authorizer_handler"] = authorizer
_spec.loader.exec_module(authorizer)

CLIENT_ID = "123456789.apps.googleusercontent.com"
ADMIN_EMAIL = "adam@seahavenind.com"


def _event(token="good-token"):
    headers = {}
    if token is not None:
        headers["authorization"] = f"Bearer {token}"
    return {"headers": headers}


@patch.dict(
    os.environ, {"GOOGLE_CLIENT_ID_PARAM": "/meal-order-manager/google-client-id"}
)
@patch("admin_authorizer_handler.get_settings")
@patch("admin_authorizer_handler._verify_google_token")
@patch("admin_authorizer_handler._get_google_client_id")
def test_valid_admin_allowed(mock_cid, mock_verify, mock_settings):
    mock_cid.return_value = CLIENT_ID
    mock_verify.return_value = {"name": "Adam", "email": ADMIN_EMAIL}
    mock_settings.return_value = {"admin_emails": [ADMIN_EMAIL]}
    assert authorizer.lambda_handler(_event(), None) == {"isAuthorized": True}


@patch.dict(
    os.environ, {"GOOGLE_CLIENT_ID_PARAM": "/meal-order-manager/google-client-id"}
)
@patch("admin_authorizer_handler.get_settings")
@patch("admin_authorizer_handler._verify_google_token")
@patch("admin_authorizer_handler._get_google_client_id")
def test_valid_user_but_not_admin_denied(mock_cid, mock_verify, mock_settings):
    mock_cid.return_value = CLIENT_ID
    mock_verify.return_value = {"name": "Bob", "email": "bob@seahavenind.com"}
    mock_settings.return_value = {"admin_emails": [ADMIN_EMAIL]}
    assert authorizer.lambda_handler(_event(), None) == {"isAuthorized": False}


@patch.dict(
    os.environ, {"GOOGLE_CLIENT_ID_PARAM": "/meal-order-manager/google-client-id"}
)
@patch("admin_authorizer_handler._verify_google_token")
@patch("admin_authorizer_handler._get_google_client_id")
def test_invalid_token_denied(mock_cid, mock_verify):
    mock_cid.return_value = CLIENT_ID
    mock_verify.return_value = None  # bad/expired token or wrong domain
    assert authorizer.lambda_handler(_event("bad"), None) == {"isAuthorized": False}


@patch.dict(
    os.environ, {"GOOGLE_CLIENT_ID_PARAM": "/meal-order-manager/google-client-id"}
)
def test_missing_token_denied():
    assert authorizer.lambda_handler(_event(token=None), None) == {
        "isAuthorized": False
    }


@patch.dict(
    os.environ, {"GOOGLE_CLIENT_ID_PARAM": "/meal-order-manager/google-client-id"}
)
@patch("admin_authorizer_handler._get_google_client_id")
def test_client_id_unavailable_denied(mock_cid):
    mock_cid.return_value = ""  # SSM failure or empty -> fail closed
    assert authorizer.lambda_handler(_event(), None) == {"isAuthorized": False}


@patch.dict(os.environ, {"GOOGLE_CLIENT_ID_PARAM": ""}, clear=False)
def test_authorizer_unconfigured_denied():
    assert authorizer.lambda_handler(_event(), None) == {"isAuthorized": False}


@patch.dict(
    os.environ, {"GOOGLE_CLIENT_ID_PARAM": "/meal-order-manager/google-client-id"}
)
@patch("admin_authorizer_handler.get_settings")
@patch("admin_authorizer_handler._verify_google_token")
@patch("admin_authorizer_handler._get_google_client_id")
def test_dynamodb_failure_denied(mock_cid, mock_verify, mock_settings):
    """A DynamoDB error loading admin_emails fails closed (DENY, not a 500)."""
    mock_cid.return_value = CLIENT_ID
    mock_verify.return_value = {"name": "Adam", "email": ADMIN_EMAIL}
    mock_settings.side_effect = RuntimeError("dynamo down")
    assert authorizer.lambda_handler(_event(), None) == {"isAuthorized": False}


def test_audience_mismatch_denied():
    """_verify_google_token rejects a token whose aud != configured client ID."""
    with patch.object(authorizer.urllib.request, "urlopen") as mock_open:
        resp = mock_open.return_value.__enter__.return_value
        resp.read.return_value = (
            b'{"aud":"other-client","hd":"seahavenind.com","email":"x@seahavenind.com"}'
        )
        assert authorizer._verify_google_token("t", CLIENT_ID) is None


def test_domain_mismatch_denied():
    """_verify_google_token rejects a token from a non-allowed Workspace domain."""
    with patch.object(authorizer.urllib.request, "urlopen") as mock_open:
        resp = mock_open.return_value.__enter__.return_value
        resp.read.return_value = (
            f'{{"aud":"{CLIENT_ID}","hd":"evil.com","email":"x@evil.com"}}'.encode()
        )
        assert authorizer._verify_google_token("t", CLIENT_ID) is None


def test_valid_token_decoded():
    with patch.object(authorizer.urllib.request, "urlopen") as mock_open:
        resp = mock_open.return_value.__enter__.return_value
        resp.read.return_value = (
            f'{{"aud":"{CLIENT_ID}","hd":"seahavenind.com",'
            f'"email":"{ADMIN_EMAIL}","name":"Adam"}}'.encode()
        )
        info = authorizer._verify_google_token("t", CLIENT_ID)
        assert info == {"name": "Adam", "email": ADMIN_EMAIL}


if __name__ == "__main__":
    raise SystemExit(pytest.main([__file__, "-v"]))