/**
 * PolicyEngine 单元测试（P1-14 测试基线）
 * 覆盖：默认策略、deniedPatterns 深度扫描、频率限制、通配符策略
 */

import { describe, it, expect } from 'vitest';
import { PolicyEngine, DEFAULT_POLICIES } from '../permissions';

describe('PolicyEngine 默认策略', () => {
  it('所有内置工具均有策略配置', () => {
    const knownTools = [
      'read_file',
      'write_file',
      'list_directory',
      'search_files',
      'delete_file',
      'file_move',
      'file_info',
      'file_editor',
      'code_search',
      'diff_viewer',
      'web_search',
      'web_fetch',
      'web_browser',
      'http_request',
      'memory_store',
      'memory_search',
      'run_command',
      'task_manager',
      'delegate_task',
      'git_status',
      'git_diff',
      'git_log',
      'git_commit',
      'lint_code',
      'run_tests',
      'project_info',
      'think',
      'view_image',
    ];
    for (const tool of knownTools) {
      expect(DEFAULT_POLICIES.some((p) => p.toolName === tool)).toBe(true);
    }
  });

  it('未配置策略的工具被拒绝（fail-closed）', () => {
    const engine = new PolicyEngine();
    const result = engine.checkAuthorization('unknown_tool_xyz', {});
    expect(result.authorized).toBe(false);
    expect(result.reason).toContain('No policy configured');
  });

  it('read_file 默认放行', () => {
    const engine = new PolicyEngine();
    expect(engine.checkAuthorization('read_file', { file_path: 'a.ts' }).authorized).toBe(true);
  });
});

describe('deniedPatterns 深度扫描', () => {
  it('read_file 访问 /etc/passwd 被拒绝', () => {
    const engine = new PolicyEngine();
    const result = engine.checkAuthorization('read_file', { file_path: '/etc/passwd' });
    expect(result.authorized).toBe(false);
  });

  it('嵌套对象中的危险路径被拒绝（deepScanStrings）', () => {
    const engine = new PolicyEngine();
    const result = engine.checkAuthorization('read_file', {
      nested: { deep: { path: '/etc/passwd' } },
    });
    expect(result.authorized).toBe(false);
  });

  it('run_command 参数中包含 MEMORY.md 被拒绝', () => {
    const engine = new PolicyEngine();
    const result = engine.checkAuthorization('run_command', { command: 'cat MEMORY.md' });
    expect(result.authorized).toBe(false);
  });

  it('正常路径不误判', () => {
    const engine = new PolicyEngine();
    expect(engine.checkAuthorization('read_file', { file_path: 'src/main.ts' }).authorized).toBe(
      true,
    );
  });
});

describe('频率限制（滑动窗口）', () => {
  it('超过 maxFrequency 后被限流', () => {
    const engine = new PolicyEngine();
    // web_search 默认 maxFrequency: 10
    for (let i = 0; i < 10; i++) {
      expect(engine.checkAuthorization('web_search', { query: 'x' }).authorized).toBe(true);
      engine.recordCall('web_search');
    }
    const blocked = engine.checkAuthorization('web_search', { query: 'x' });
    expect(blocked.authorized).toBe(false);
    expect(blocked.reason).toContain('Rate limit exceeded');
  });

  it('限流只影响对应工具', () => {
    const engine = new PolicyEngine();
    for (let i = 0; i < 10; i++) engine.recordCall('web_search');
    // read_file 无频率限制
    expect(engine.checkAuthorization('read_file', {}).authorized).toBe(true);
  });
});

describe('通配符策略（mcp_*）', () => {
  it('MCP 动态工具命中 mcp_* 通配策略', () => {
    const engine = new PolicyEngine();
    const result = engine.checkAuthorization('mcp_filesystem_read_file', {});
    // mcp_* 策略：EXTERNAL_ACTION + requireConfirmation
    expect(result.authorized).toBe(true);
    expect(result.requiresConfirmation).toBe(true);
  });
});

describe('频率限制会话隔离（v0.4.1）', () => {
  it('不同会话各自独立配额（一个会话耗尽不影响另一个）', () => {
    const engine = new PolicyEngine();
    // web_search 默认 maxFrequency: 10
    // 会话 A 耗尽全部配额
    for (let i = 0; i < 10; i++) {
      expect(engine.checkAuthorization('web_search', { query: 'x' }, 'session-A').authorized).toBe(
        true,
      );
      engine.recordCall('web_search', 'session-A');
    }
    // 会话 A 已被限流
    expect(engine.checkAuthorization('web_search', { query: 'x' }, 'session-A').authorized).toBe(
      false,
    );
    // 会话 B 配额不受影响
    expect(engine.checkAuthorization('web_search', { query: 'x' }, 'session-B').authorized).toBe(
      true,
    );
    expect(engine.recordCall('web_search', 'session-B') === undefined).toBe(true);
  });

  it('recordCall 与 checkAuthorization 使用相同的会话 key', () => {
    const engine = new PolicyEngine();
    // 会话 A 记录 10 次
    for (let i = 0; i < 10; i++) engine.recordCall('web_search', 'session-A');
    // 会话 A 限流，会话 B 不限
    expect(engine.checkAuthorization('web_search', {}, 'session-A').authorized).toBe(false);
    expect(engine.checkAuthorization('web_search', {}, 'session-B').authorized).toBe(true);
  });

  it('无 sessionId 时计入 global 桶（向后兼容）', () => {
    const engine = new PolicyEngine();
    // 旧式调用（无 sessionId）共享 global 桶
    for (let i = 0; i < 10; i++) {
      engine.recordCall('web_search');
    }
    expect(engine.checkAuthorization('web_search', {}).authorized).toBe(false);
    expect(engine.checkAuthorization('web_search', {}, 'any-session').authorized).toBe(true);
  });
});