"""Tests for OIDC authentication module."""
import pytest
from unittest.mock import patch, MagicMock, AsyncMock
from fastapi import HTTPException

from src.auth.oidc import OIDCConfig, oidc_config, get_jwks, get_current_user


class TestOIDCConfig:
    """Test OIDCConfig class."""

    def test_init_defaults(self):
        """Config should initialize with disabled state."""
        config = OIDCConfig()

        assert config.enabled is False
        assert config.issuer == ""
        assert config.audience == ""
        assert config.jwks_uri == ""

    def test_configure_sets_values(self):
        """configure should set all values."""
        config = OIDCConfig()
        config.configure(
            enabled=True,
            issuer="https://auth.example.com",
            audience="core-api"
        )

        assert config.enabled is True
        assert config.issuer == "https://auth.example.com"
        assert config.audience == "core-api"
        assert config.jwks_uri == "https://auth.example.com/jwks/"

    def test_configure_strips_trailing_slash(self):
        """configure should handle trailing slash in issuer."""
        config = OIDCConfig()
        config.configure(
            enabled=True,
            issuer="https://auth.example.com/",
            audience="core-api"
        )

        assert config.jwks_uri == "https://auth.example.com/jwks/"


class TestGetJWKS:
    """Test get_jwks function."""

    def test_returns_empty_when_disabled(self):
        """get_jwks should return empty dict when OIDC disabled."""
        # Save original state
        original_enabled = oidc_config.enabled

        try:
            oidc_config.enabled = False
            # Clear the cache
            get_jwks.cache_clear()

            result = get_jwks()

            assert result == {}
        finally:
            # Restore original state
            oidc_config.enabled = original_enabled
            get_jwks.cache_clear()

    @patch("src.auth.oidc.httpx.get")
    def test_fetches_jwks_when_enabled(self, mock_get):
        """get_jwks should fetch JWKS when enabled."""
        # Save original state
        original_enabled = oidc_config.enabled
        original_jwks_uri = oidc_config.jwks_uri

        try:
            oidc_config.enabled = True
            oidc_config.jwks_uri = "https://auth.example.com/jwks/"
            get_jwks.cache_clear()

            mock_response = MagicMock()
            mock_response.json.return_value = {"keys": [{"kid": "test"}]}
            mock_response.raise_for_status = MagicMock()
            mock_get.return_value = mock_response

            result = get_jwks()

            assert "keys" in result
            mock_get.assert_called_once()
        finally:
            oidc_config.enabled = original_enabled
            oidc_config.jwks_uri = original_jwks_uri
            get_jwks.cache_clear()

    @patch("src.auth.oidc.httpx.get")
    def test_raises_exception_on_error(self, mock_get):
        """get_jwks should raise HTTPException on fetch error."""
        # Save original state
        original_enabled = oidc_config.enabled
        original_jwks_uri = oidc_config.jwks_uri

        try:
            oidc_config.enabled = True
            oidc_config.jwks_uri = "https://auth.example.com/jwks/"
            get_jwks.cache_clear()

            mock_get.side_effect = Exception("Connection error")

            with pytest.raises(HTTPException) as exc_info:
                get_jwks()

            assert exc_info.value.status_code == 503
        finally:
            oidc_config.enabled = original_enabled
            oidc_config.jwks_uri = original_jwks_uri
            get_jwks.cache_clear()


class TestGetCurrentUser:
    """Test get_current_user function."""

    @pytest.mark.asyncio
    async def test_returns_none_when_disabled(self):
        """get_current_user should return None when OIDC disabled."""
        # Save original state
        original_enabled = oidc_config.enabled

        try:
            oidc_config.enabled = False

            result = await get_current_user(credentials=None)

            assert result is None
        finally:
            oidc_config.enabled = original_enabled

    @pytest.mark.asyncio
    async def test_raises_401_when_enabled_without_token(self):
        """get_current_user should raise 401 when enabled but no token."""
        # Save original state
        original_enabled = oidc_config.enabled

        try:
            oidc_config.enabled = True

            with pytest.raises(HTTPException) as exc_info:
                await get_current_user(credentials=None)

            assert exc_info.value.status_code == 401
        finally:
            oidc_config.enabled = original_enabled


class TestOIDCGlobalConfig:
    """Test global OIDC config."""

    def test_global_config_exists(self):
        """oidc_config should be an OIDCConfig instance."""
        assert isinstance(oidc_config, OIDCConfig)

    def test_global_config_starts_disabled(self):
        """oidc_config should start disabled by default."""
        # This tests the initial state before any configure() is called
        # The actual state depends on app configuration
        assert hasattr(oidc_config, 'enabled')
        assert hasattr(oidc_config, 'issuer')
        assert hasattr(oidc_config, 'audience')
        assert hasattr(oidc_config, 'jwks_uri')