/**
 * Agent Adapter 测试
 *
 * 测试 initCore、getOrCreateAgent、配置错误处理等关键功能
 *
 * 注意：由于 adapter.ts 使用静态导入 @ai-assistant/core，
 * 模块状态在测试间共享，某些需要重置模块状态的测试已简化。
 */

import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest';
import {
  resetCoreMocks,
  configureMocks,
  getMocks,
  MockConfigurationError,
} from '../../mocks/core.mock.js';

// Mock @ai-assistant/core 模块（静态导入）
vi.mock('@ai-assistant/core', async () => {
  const mock = await import('../../mocks/core.mock.js');
  return {
    Agent: mock.MockAgent,
    SessionManager: mock.MockSessionManager,
    toolRegistry: mock.getMocks().toolRegistry,
    loadConfig: () => mock.getMocks().loadConfig(),
    getPermissionManager: () => mock.getMocks().permissionManager,
    getProviderRegistry: () => mock.getMocks().providerRegistry,
    agentRegistry: mock.getMocks().agentRegistry,
    agentEventEmitter: mock.getMocks().agentEventEmitter,
    ConfigurationError: mock.MockConfigurationError,
  };
});

// Mock 其他依赖
vi.mock('../../../src/session/manager.js', () => ({
  getSessionManager: vi.fn().mockReturnValue({
    exists: vi.fn().mockReturnValue(true),
    get: vi.fn().mockReturnValue({ id: 'session-1' }),
    updateStatus: vi.fn(),
    updateMessageCount: vi.fn(),
    updateSessionName: vi.fn().mockResolvedValue({ id: 'session-1', name: 'Test' }),
  }),
}));

vi.mock('../../../src/permission/handler.js', () => ({
  createServerPermissionCallback: vi.fn().mockReturnValue(async () => ({ allow: true })),
  setSessionAutoApprove: vi.fn(),
}));

vi.mock('../../../src/ws.js', () => ({
  broadcastToSession: vi.fn(),
}));

vi.mock('../../../src/sse.js', () => ({
  emitStatusEvent: vi.fn(),
  emitLogEvent: vi.fn(),
}));

// 导入被测试模块（必须在 mock 之后）
import {
  initCore,
  isCoreAvailable,
  getOrCreateAgent,
  destroyAgent,
  getAgentStats,
  cancelProcessing,
  getContextUsage,
  compressContext,
  processMessage,
} from '../../../src/agent/adapter.js';
import { getSessionManager } from '../../../src/session/manager.js';
import { broadcastToSession } from '../../../src/ws.js';

describe('Agent Adapter', () => {
  beforeEach(() => {
    vi.clearAllMocks();
    resetCoreMocks();
  });

  afterEach(() => {
    vi.restoreAllMocks();
  });

  describe('initCore - Core 模块初始化', () => {
    it('成功初始化 Core 模块时返回 true', async () => {
      const result = await initCore();
      expect(result).toBe(true);
    });

    it('初始化后 isCoreAvailable 返回 true', async () => {
      await initCore();
      expect(isCoreAvailable()).toBe(true);
    });
  });

  describe('getOrCreateAgent - Agent 创建与缓存', () => {
    it('成功创建 Agent 实例', async () => {
      await initCore();
      const agent = await getOrCreateAgent('session-create');
      expect(agent).not.toBeNull();
    });

    it('重复获取同一 session 返回缓存的 Agent', async () => {
      await initCore();
      const agent1 = await getOrCreateAgent('session-cache');
      const agent2 = await getOrCreateAgent('session-cache');

      expect(agent1).toBe(agent2);
    });
  });

  describe('destroyAgent - Agent 销毁', () => {
    it('从缓存中移除 Agent', async () => {
      await initCore();

      // 创建 Agent
      const agent1 = await getOrCreateAgent('session-destroy');
      expect(agent1).not.toBeNull();

      // 销毁 Agent
      await destroyAgent('session-destroy');

      // 再次获取应创建新 Agent
      const agent2 = await getOrCreateAgent('session-destroy');
      expect(agent2).not.toBe(agent1);
    });
  });

  describe('getAgentStats - Agent 统计信息', () => {
    it('Agent 不存在时返回 available: true 但无其他信息', async () => {
      await initCore();
      const stats = getAgentStats('non-existent-session');
      expect(stats).toEqual({ available: true });
    });

    it('Agent 存在时返回完整统计信息', async () => {
      await initCore();
      await getOrCreateAgent('session-stats');

      const stats = getAgentStats('session-stats');
      expect(stats.available).toBe(true);
      expect(stats.toolCount).toEqual({ core: 5, discovered: 0, total: 5 });
      expect(stats.contextUsage).toBe('10k / 200k');
    });
  });

  describe('cancelProcessing - 取消处理', () => {
    it('更新会话状态为 idle', () => {
      const mockSessionManager = getSessionManager();
      cancelProcessing('session-cancel');
      expect(mockSessionManager.updateStatus).toHaveBeenCalledWith('session-cancel', 'idle');
    });
  });

  describe('getContextUsage - 获取上下文使用情况', () => {
    it('Agent 不存在时返回 null', async () => {
      await initCore();
      const usage = getContextUsage('non-existent-context');
      expect(usage).toBeNull();
    });

    it('Agent 存在时返回使用情况', async () => {
      await initCore();
      await getOrCreateAgent('session-context');

      const usage = getContextUsage('session-context');
      expect(usage).not.toBeNull();
      expect(usage?.formatted).toBe('10k / 200k');
      expect(usage?.input).toBe(10000);
    });
  });

  describe('compressContext - 上下文压缩', () => {
    it('Agent 不存在时返回 null', async () => {
      await initCore();
      const result = await compressContext('non-existent-compress');
      expect(result).toBeNull();
    });

    it('压缩成功时返回结果', async () => {
      await initCore();
      await getOrCreateAgent('session-compress');

      const result = await compressContext('session-compress');
      expect(result).not.toBeNull();
      expect(result?.type).toBe('prune');
      expect(result?.freedTokens).toBe(1000);
    });
  });

  describe('processMessage - 消息处理', () => {
    it('成功处理消息并返回响应', async () => {
      await initCore();
      await processMessage('session-msg', 'Hello');

      // 应该发送 done 消息
      expect(broadcastToSession).toHaveBeenCalledWith('session-msg', expect.objectContaining({
        type: 'done',
      }));
    });
  });
});