"""
权限和访问控制测试 - P1 级别

测试 GitHub Token 权限、仓库访问控制、API 限流等权限相关的安全场景：
- GitHub Token 权限验证
- 仓库访问控制
- API 限流处理
- 异常请求防护
"""

import os
from unittest.mock import MagicMock, patch

import pytest
from github.GithubException import BadCredentialsException, RateLimitExceededException

from app.services.github_service import GitHubService


# =============================================================================
# Fixtures
# =============================================================================


@pytest.fixture
def mock_github():
    """Mock GitHub API 客户端"""
    with patch("app.services.github_service.Github") as mock:
        yield mock


@pytest.fixture
def mock_repo():
    """Mock GitHub 仓库对象"""
    repo = MagicMock()
    repo.full_name = "test-owner/test-repo"
    repo.owner.login = "test-owner"
    repo.name = "test-repo"
    return repo


@pytest.fixture
def mock_github_instance(mock_repo):
    """Mock 带有仓库的 GitHub 实例"""
    github = MagicMock()
    github.get_user.return_value.login = "test-user"
    github.get_user.return_value.rate_limiting_remaining_hits = 5000
    github.get_repo.return_value = mock_repo
    return github


# =============================================================================
# GitHub Token 权限验证测试
# =============================================================================


class TestGitHubTokenPermissions:
    """测试 GitHub Token 权限验证"""

    def test_valid_token_authentication(self, mock_github, mock_github_instance):
        """
        测试：有效的 Token 应该能成功认证

        场景：使用有效的 GitHub Token
        期望：成功连接到 GitHub API
        严重性：P0
        """
        mock_github.return_value = mock_github_instance

        with patch.dict(
            os.environ,
            {
                "GITHUB_TOKEN": "ghp_valid_token_12345",
                "GITHUB_REPO_OWNER": "test-owner",
                "GITHUB_REPO_NAME": "test-repo",
            },
        ):
            service = GitHubService()
            assert service.token == "ghp_valid_token_12345"

    def test_invalid_token_rejected(self, mock_github):
        """
        测试：无效的 Token 应该被拒绝

        场景：使用无效或过期的 GitHub Token
        期望：抛出认证失败异常
        严重性：P0
        """
        mock_github.side_effect = BadCredentialsException(401, {"message": "Bad credentials"})

        with patch.dict(
            os.environ,
            {
                "GITHUB_TOKEN": "ghp_invalid_token",
                "GITHUB_REPO_OWNER": "test-owner",
                "GITHUB_REPO_NAME": "test-repo",
            },
        ):
            with pytest.raises(BadCredentialsException):
                GitHubService()

    def test_token_with_minimal_permissions(self, mock_github, mock_github_instance):
        """
        测试：Token 应该遵循最小权限原则

        场景：Token 只应该有必要的权限
        期望：验证 Token 权限范围
        严重性：P0 - 关键安全要求

        注意：这个测试验证 Token 是否只授予了必要的权限
        实际的权限检查需要在 GitHub 设置中手动验证
        """
        mock_github.return_value = mock_github_instance

        with patch.dict(
            os.environ,
            {
                "GITHUB_TOKEN": "ghp_token_with_limited_scope",
                "GITHUB_REPO_OWNER": "test-owner",
                "GITHUB_REPO_NAME": "test-repo",
            },
        ):
            service = GitHubService()

            # TODO: 实现 Token 权限范围验证
            # 应该检查 Token 只有以下权限：
            # - repo:status (读取提交状态)
            # - repo_deployment (管理部署)
            # - public_repo (访问公开仓库)
            # - read:org (读取组织信息 - 如果需要)
            #
            # 不应该有：
            # - admin:org (组织管理)
            # - delete_repo (删除仓库)
            # - user (用户信息修改)
            # 等高权限

            assert service.token is not None

    def test_token_not_exposed_in_logs(self, mock_github, mock_github_instance, caplog):
        """
        测试：Token 不应该暴露在日志中

        场景：GitHub 操作记录日志
        期望：日志中不包含完整的 Token
        严重性：P0
        """
        mock_github.return_value = mock_github_instance

        with patch.dict(
            os.environ,
            {
                "GITHUB_TOKEN": "ghp_secret_token_12345",
                "GITHUB_REPO_OWNER": "test-owner",
                "GITHUB_REPO_NAME": "test-repo",
            },
        ):
            with caplog.at_level("INFO"):
                service = GitHubService()

            # 检查日志中不包含完整 token
            for record in caplog.records:
                assert "ghp_secret_token_12345" not in record.message
                assert "ghp_" not in record.message or "token" not in record.message.lower()

    def test_token_rotation_support(self, mock_github, mock_github_instance):
        """
        测试：应该支持 Token 轮换

        场景：Token 需要定期轮换
        期望：应该能接受新的 Token 而不中断服务
        严重性：P1

        注意：当前实现每次创建 GitHubService 实例时都会读取新的 Token
        这个测试验证这个设计
        """
        mock_github.return_value = mock_github_instance

        # 使用第一个 Token
        with patch.dict(
            os.environ,
            {
                "GITHUB_TOKEN": "ghp_old_token",
                "GITHUB_REPO_OWNER": "test-owner",
                "GITHUB_REPO_NAME": "test-repo",
            },
        ):
            service1 = GitHubService()
            assert service1.token == "ghp_old_token"

        # 使用新 Token
        with patch.dict(
            os.environ,
            {
                "GITHUB_TOKEN": "ghp_new_token",
                "GITHUB_REPO_OWNER": "test-owner",
                "GITHUB_REPO_NAME": "test-repo",
            },
        ):
            service2 = GitHubService()
            assert service2.token == "ghp_new_token"


# =============================================================================
# 仓库访问控制测试
# =============================================================================


class TestRepositoryAccessControl:
    """测试仓库访问控制"""

    def test_access_to_configured_repo(self, mock_github, mock_github_instance):
        """
        测试：应该只能访问配置的仓库

        场景：尝试访问指定的仓库
        期望：成功访问
        严重性：P0
        """
        mock_github.return_value = mock_github_instance

        with patch.dict(
            os.environ,
            {
                "GITHUB_TOKEN": "ghp_test_token",
                "GITHUB_REPO_OWNER": "test-owner",
                "GITHUB_REPO_NAME": "test-repo",
            },
        ):
            service = GitHubService()
            repo = service._get_repo()

            assert repo is not None
            service.github.get_repo.assert_called_with("test-owner/test-repo")

    def test_access_to_unauthorized_repo_blocked(self, mock_github):
        """
        测试：不应该能访问未授权的仓库

        场景：尝试访问配置外的其他仓库
        期望：访问被拒绝或抛出异常
        严重性：P0

        注意：当前实现使用配置的仓库，这个测试验证这个设计
        """
        mock_github_instance = MagicMock()
        mock_github_instance.get_user.return_value.login = "test-user"
        mock_github_instance.get_user.return_value.rate_limiting_remaining_hits = 5000
        # 尝试访问不同仓库时抛出异常
        mock_github_instance.get_repo.side_effect = Exception(
            "Repository not found or access denied"
        )
        mock_github.return_value = mock_github_instance

        with patch.dict(
            os.environ,
            {
                "GITHUB_TOKEN": "ghp_test_token",
                "GITHUB_REPO_OWNER": "test-owner",
                "GITHUB_REPO_NAME": "test-repo",
            },
        ):
            service = GitHubService()

            # _get_repo 应该只访问配置的仓库
            # 如果尝试访问其他仓库，应该抛出异常
            with pytest.raises(Exception):
                service.github.get_repo("other-owner/other-repo")

    def test_cross_tenant_isolation(self):
        """
        测试：多租户隔离（如果适用）

        场景：不同租户的数据应该完全隔离
        期望：不能跨租户访问数据
        严重性：P0

        注意：当前实现是单租户，但这个测试记录了安全要求
        """
        # TODO: 如果支持多租户，实现隔离测试
        # 例如：用户 A 不能访问用户 B 的仓库
        pass

    def test_private_repo_access_restricted(self):
        """
        测试：私有仓库访问应该被正确限制

        场景：Token 尝试访问没有权限的私有仓库
        期望：访问被拒绝
        严重性：P0
        """
        # TODO: 实现私有仓库访问测试
        # 需要模拟没有权限的情况
        pass


# =============================================================================
# API 限流处理测试
# =============================================================================


class TestAPIRateLimiting:
    """测试 GitHub API 限流处理"""

    def test_rate_limit_check(self, mock_github, mock_github_instance):
        """
        测试：应该能检查 API 限流状态

        场景：获取当前 API 限额信息
        期望：返回限额详情
        严重性：P1
        """
        mock_limits = MagicMock()
        mock_limits.core.remaining = 4800
        mock_limits.core.limit = 5000
        mock_limits.core.reset.timestamp.return_value = 1234567890

        mock_github_instance.get_rate_limit.return_value = mock_limits
        mock_github.return_value = mock_github_instance

        with patch.dict(
            os.environ,
            {
                "GITHUB_TOKEN": "ghp_test_token",
                "GITHUB_REPO_OWNER": "test-owner",
                "GITHUB_REPO_NAME": "test-repo",
            },
        ):
            service = GitHubService()
            limits = service.get_rate_limit()

            assert limits["remaining"] == 4800
            assert limits["limit"] == 5000
            assert limits["used"] == 200

    def test_rate_limit_exceeded_handled(self, mock_github):
        """
        测试：应该优雅处理 API 限流

        场景：API 请求超过限流阈值
        期望：抛出限流异常或等待重置
        严重性：P1
        """
        mock_github.side_effect = RateLimitExceededException(
            403, {"message": "API rate limit exceeded"}
        )

        with patch.dict(
            os.environ,
            {
                "GITHUB_TOKEN": "ghp_test_token",
                "GITHUB_REPO_OWNER": "test-owner",
                "GITHUB_REPO_NAME": "test-repo",
            },
        ):
            with pytest.raises(RateLimitExceededException):
                GitHubService()

    def test_rate_limit_retry_after_reset(self, mock_github, mock_github_instance):
        """
        测试：应该在限流重置后重试

        场景：API 限流后等待重置再重试
        期望：重试成功
        严重性：P2 - 性能优化

        注意：当前实现可能没有自动重试
        这个测试记录了改进建议
        """
        # TODO: 实现自动重试机制
        # 1. 检测到限流
        # 2. 等待直到 reset 时间
        # 3. 自动重试请求
        pass

    def test_rate_limit_warning_threshold(self, mock_github, mock_github_instance):
        """
        测试：应该在接近限流时发出警告

        场景：API 限额使用超过 80%
        期望：记录警告日志
        严重性：P2
        """
        mock_limits = MagicMock()
        mock_limits.core.remaining = 500  # 10% 剩余
        mock_limits.core.limit = 5000

        mock_github_instance.get_rate_limit.return_value = mock_limits
        mock_github.return_value = mock_github_instance

        with patch.dict(
            os.environ,
            {
                "GITHUB_TOKEN": "ghp_test_token",
                "GITHUB_REPO_OWNER": "test-owner",
                "GITHUB_REPO_NAME": "test-repo",
            },
        ):
            service = GitHubService()
            limits = service.get_rate_limit()

            # TODO: 实现警告阈值检查
            # 当剩余请求 < 20% 时记录警告
            assert limits["remaining"] == 500


# =============================================================================
# 异常请求防护测试
# =============================================================================


class TestAbnormalRequestProtection:
    """测试异常请求防护"""

    def test_excessive_request_rate(self, mock_github, mock_github_instance):
        """
        测试：应该防护过度频繁的请求

        场景：短时间内发送大量请求
        期望：实施请求限流
        严重性：P1

        注意：当前实现可能没有客户端限流
        这个测试记录了安全要求
        """
        mock_github.return_value = mock_github_instance

        with patch.dict(
            os.environ,
            {
                "GITHUB_TOKEN": "ghp_test_token",
                "GITHUB_REPO_OWNER": "test-owner",
                "GITHUB_REPO_NAME": "test-repo",
            },
        ):
            service = GitHubService()

            # TODO: 实现请求限流
            # 例如：使用令牌桶或漏桶算法
            # 限制每分钟最多 N 个请求

            # 模拟大量请求
            for i in range(100):
                # 当前实现没有限流，所以会发送所有请求
                # 应该添加限流机制
                pass

    def test_burst_request_protection(self, mock_github, mock_github_instance):
        """
        测试：应该防护突发请求

        场景：瞬间大量并发请求
        期望：限制并发请求数
        严重性：P1
        """
        mock_github.return_value = mock_github_instance

        with patch.dict(
            os.environ,
            {
                "GITHUB_TOKEN": "ghp_test_token",
                "GITHUB_REPO_OWNER": "test-owner",
                "GITHUB_REPO_NAME": "test-repo",
            },
        ):
            service = GitHubService()

            # TODO: 实现并发请求限制
            # 例如：使用信号量限制并发数
            pass

    def test_malformed_request_handling(self, mock_github, mock_github_instance):
        """
        测试：应该处理格式错误的请求

        场景：发送格式错误的 API 请求
        期望：优雅处理错误，不崩溃
        严重性：P1
        """
        mock_github.return_value = mock_github_instance

        # 使 get_repo 抛出异常
        mock_github_instance.get_repo.side_effect = Exception("Bad request")

        with patch.dict(
            os.environ,
            {
                "GITHUB_TOKEN": "ghp_test_token",
                "GITHUB_REPO_OWNER": "test-owner",
                "GITHUB_REPO_NAME": "test-repo",
            },
        ):
            service = GitHubService()

            with pytest.raises(Exception):
                service._get_repo()

    def test_request_timeout_handling(self, mock_github, mock_github_instance):
        """
        测试：应该处理请求超时

        场景：API 请求超时
        期望：超时后优雅处理，不阻塞
        严重性：P1
        """
        # 模拟超时
        mock_github_instance.get_repo.side_effect = Exception("Request timeout")

        mock_github.return_value = mock_github_instance

        with patch.dict(
            os.environ,
            {
                "GITHUB_TOKEN": "ghp_test_token",
                "GITHUB_REPO_OWNER": "test-owner",
                "GITHUB_REPO_NAME": "test-repo",
            },
        ):
            service = GitHubService()

            with pytest.raises(Exception):
                service._get_repo()


# =============================================================================
# 操作权限测试
# =============================================================================


class TestOperationPermissions:
    """测试具体操作的权限控制"""

    def test_pr_create_permission_required(self, mock_github, mock_github_instance):
        """
        测试：创建 PR 应该需要相应权限

        场景：尝试创建 PR
        期望：验证有足够权限
        严重性：P0
        """
        mock_pr = MagicMock()
        mock_pr.number = 123
        mock_pr.url = "https://api.github.com/repos/test/pulls/123"
        mock_pr.html_url = "https://github.com/test/pull/123"
        mock_pr.state = "open"
        mock_pr.title = "Test PR"

        mock_repo = MagicMock()
        mock_repo.create_pull.return_value = mock_pr

        mock_github_instance.get_repo.return_value = mock_repo
        mock_github.return_value = mock_github_instance

        with patch.dict(
            os.environ,
            {
                "GITHUB_TOKEN": "ghp_test_token",
                "GITHUB_REPO_OWNER": "test-owner",
                "GITHUB_REPO_NAME": "test-repo",
            },
        ):
            service = GitHubService()
            pr_info = service.create_pull_request(
                branch_name="feature/test",
                issue_number=1,
                issue_title="Test",
                issue_body="Test body",
            )

            assert pr_info["pr_number"] == 123

    def test_comment_create_permission_required(self, mock_github, mock_github_instance):
        """
        测试：创建评论应该需要相应权限

        场景：尝试添加评论
        期望：验证有足够权限
        严重性：P0
        """
        mock_issue = MagicMock()
        mock_issue.create_comment.return_value = None

        mock_repo = MagicMock()
        mock_repo.get_issue.return_value = mock_issue

        mock_github_instance.get_repo.return_value = mock_repo
        mock_github.return_value = mock_github_instance

        with patch.dict(
            os.environ,
            {
                "GITHUB_TOKEN": "ghp_test_token",
                "GITHUB_REPO_OWNER": "test-owner",
                "GITHUB_REPO_NAME": "test-repo",
            },
        ):
            service = GitHubService()
            service.add_comment_to_issue(issue_number=1, comment="Test comment")

            mock_issue.create_comment.assert_called_once_with("Test comment")

    def test_unauthorized_operation_blocked(self, mock_github, mock_github_instance):
        """
        测试：未授权的操作应该被拒绝

        场景：Token 尝试执行超出权限的操作
        期望：操作被拒绝
        严重性：P0
        """
        mock_repo = MagicMock()
        # 模拟权限不足
        mock_repo.create_pull.side_effect = Exception("Resource not accessible by integration")

        mock_github_instance.get_repo.return_value = mock_repo
        mock_github.return_value = mock_github_instance

        with patch.dict(
            os.environ,
            {
                "GITHUB_TOKEN": "ghp_limited_token",
                "GITHUB_REPO_OWNER": "test-owner",
                "GITHUB_REPO_NAME": "test-repo",
            },
        ):
            service = GitHubService()

            with pytest.raises(Exception):
                service.create_pull_request(
                    branch_name="feature/test",
                    issue_number=1,
                    issue_title="Test",
                    issue_body="Test",
                )


# =============================================================================
# 权限审计测试
# =============================================================================


class TestPermissionAuditing:
    """测试权限审计和监控"""

    def test_permission_usage_logging(self, mock_github, mock_github_instance, caplog):
        """
        测试：应该记录权限使用情况

        场景：执行需要权限的操作
        期望：记录权限使用日志
        严重性：P2
        """
        mock_github.return_value = mock_github_instance

        with patch.dict(
            os.environ,
            {
                "GITHUB_TOKEN": "ghp_test_token",
                "GITHUB_REPO_OWNER": "test-owner",
                "GITHUB_REPO_NAME": "test-repo",
            },
        ):
            with caplog.at_level("INFO"):
                service = GitHubService()

            # 检查日志中包含权限相关信息
            # 但不包含敏感的 Token
            assert any("API 连接成功" in record.message for record in caplog.records)
            assert not any("ghp_test_token" in record.message for record in caplog.records)

    def test_unauthorized_access_attempt_detection(self):
        """
        测试：应该检测未授权访问尝试

        场景：尝试未授权的访问
        期望：记录安全事件
        严重性：P1

        注意：当前实现可能没有这个功能
        这个测试记录了安全要求
        """
        # TODO: 实现未授权访问检测
        # 1. 记录所有权限拒绝事件
        # 2. 检测可疑的访问模式
        # 3. 触发安全警报
        pass

    def test_permission_change_notification(self):
        """
        测试：权限变更应该有通知

        场景：Token 权限被修改
        期望：检测并通知
        严重性：P2

        注意：这是一个建议的安全特性
        """
        # TODO: 实现权限变更检测
        # 定期验证 Token 权限范围
        # 如果权限发生变化，发送通知
        pass
