# Copyright (c) Meta Platforms, Inc. and affiliates.
# All rights reserved.
#
# This source code is licensed under the terms described in the LICENSE file in
# the root directory of this source tree.

from unittest.mock import AsyncMock, patch

import httpx
import pytest
from fastapi import FastAPI
from fastapi.testclient import TestClient

from llama_stack.distribution.datatypes import AuthenticationConfig, AuthProviderType, GitHubTokenAuthConfig
from llama_stack.distribution.server.auth import AuthenticationMiddleware


class MockResponse:
    def __init__(self, status_code, json_data):
        self.status_code = status_code
        self._json_data = json_data

    def json(self):
        return self._json_data

    def raise_for_status(self):
        if self.status_code != 200:
            # Create a mock request for the HTTPStatusError
            mock_request = httpx.Request("GET", "https://api.github.com/user")
            raise httpx.HTTPStatusError(f"HTTP error: {self.status_code}", request=mock_request, response=self)


@pytest.fixture
def github_token_app():
    app = FastAPI()

    # Configure GitHub token auth
    auth_config = AuthenticationConfig(
        provider_config=GitHubTokenAuthConfig(
            type=AuthProviderType.GITHUB_TOKEN,
            github_api_base_url="https://api.github.com",
            claims_mapping={
                "login": "username",
                "id": "user_id",
                "organizations": "teams",
            },
        ),
        access_policy=[],
    )

    # Add auth middleware
    app.add_middleware(AuthenticationMiddleware, auth_config=auth_config)

    @app.get("/test")
    def test_endpoint():
        return {"message": "Authentication successful"}

    return app


@pytest.fixture
def github_token_client(github_token_app):
    return TestClient(github_token_app)


def test_authenticated_endpoint_without_token(github_token_client):
    """Test accessing protected endpoint without token"""
    response = github_token_client.get("/test")
    assert response.status_code == 401
    assert "Authentication required" in response.json()["error"]["message"]
    assert "GitHub access token" in response.json()["error"]["message"]


def test_authenticated_endpoint_with_invalid_bearer_format(github_token_client):
    """Test accessing protected endpoint with invalid bearer format"""
    response = github_token_client.get("/test", headers={"Authorization": "InvalidFormat token123"})
    assert response.status_code == 401
    assert "Invalid Authorization header format" in response.json()["error"]["message"]


@patch("llama_stack.distribution.server.auth_providers.httpx.AsyncClient")
def test_authenticated_endpoint_with_valid_github_token(mock_client_class, github_token_client):
    """Test accessing protected endpoint with valid GitHub token"""
    # Mock the GitHub API responses
    mock_client = AsyncMock()
    mock_client_class.return_value.__aenter__.return_value = mock_client

    # Mock successful user API response
    mock_client.get.side_effect = [
        MockResponse(
            200,
            {
                "login": "testuser",
                "id": 12345,
                "email": "test@example.com",
                "name": "Test User",
            },
        ),
        MockResponse(
            200,
            [
                {"login": "test-org-1"},
                {"login": "test-org-2"},
            ],
        ),
    ]

    response = github_token_client.get("/test", headers={"Authorization": "Bearer github_token_123"})
    assert response.status_code == 200
    assert response.json()["message"] == "Authentication successful"

    # Verify the GitHub API was called correctly
    assert mock_client.get.call_count == 1
    calls = mock_client.get.call_args_list
    assert calls[0][0][0] == "https://api.github.com/user"

    # Check authorization header was passed
    assert calls[0][1]["headers"]["Authorization"] == "Bearer github_token_123"


@patch("llama_stack.distribution.server.auth_providers.httpx.AsyncClient")
def test_authenticated_endpoint_with_invalid_github_token(mock_client_class, github_token_client):
    """Test accessing protected endpoint with invalid GitHub token"""
    # Mock the GitHub API to return 401 Unauthorized
    mock_client = AsyncMock()
    mock_client_class.return_value.__aenter__.return_value = mock_client

    # Mock failed user API response
    mock_client.get.return_value = MockResponse(401, {"message": "Bad credentials"})

    response = github_token_client.get("/test", headers={"Authorization": "Bearer invalid_token"})
    assert response.status_code == 401
    assert (
        "GitHub token validation failed. Please check your token and try again." in response.json()["error"]["message"]
    )


@patch("llama_stack.distribution.server.auth_providers.httpx.AsyncClient")
def test_github_enterprise_support(mock_client_class):
    """Test GitHub Enterprise support with custom API base URL"""
    app = FastAPI()

    # Configure GitHub token auth with enterprise URL
    auth_config = AuthenticationConfig(
        provider_config=GitHubTokenAuthConfig(
            type=AuthProviderType.GITHUB_TOKEN,
            github_api_base_url="https://github.enterprise.com/api/v3",
        ),
        access_policy=[],
    )

    app.add_middleware(AuthenticationMiddleware, auth_config=auth_config)

    @app.get("/test")
    def test_endpoint():
        return {"message": "Authentication successful"}

    client = TestClient(app)

    # Mock the GitHub Enterprise API responses
    mock_client = AsyncMock()
    mock_client_class.return_value.__aenter__.return_value = mock_client

    # Mock successful user API response
    mock_client.get.side_effect = [
        MockResponse(
            200,
            {
                "login": "enterprise_user",
                "id": 99999,
                "email": "user@enterprise.com",
            },
        ),
        MockResponse(
            200,
            [
                {"login": "enterprise-org"},
            ],
        ),
    ]

    response = client.get("/test", headers={"Authorization": "Bearer enterprise_token"})
    assert response.status_code == 200

    # Verify the correct GitHub Enterprise URLs were called
    assert mock_client.get.call_count == 1
    calls = mock_client.get.call_args_list
    assert calls[0][0][0] == "https://github.enterprise.com/api/v3/user"


def test_github_token_auth_error_message_format(github_token_client):
    """Test that the error message for missing auth is properly formatted"""
    response = github_token_client.get("/test")
    assert response.status_code == 401

    error_data = response.json()
    assert "error" in error_data
    assert "message" in error_data["error"]
    assert "Authentication required" in error_data["error"]["message"]
    assert "https://docs.github.com" in error_data["error"]["message"]  # Contains link to GitHub docs