/**
 * WebSocket Handler 测试
 *
 * 测试 WebSocket 连接处理、消息路由、广播功能等
 *
 * 注意：消息存储已移至 Core 层，Server 的 WebSocket 只负责消息广播和路由
 */

import { describe, it, expect, beforeEach, vi } from 'vitest';

// Create mock functions
const mockExists = vi.fn();
const mockUpdateStatus = vi.fn();
const mockGet = vi.fn();

// Mock dependencies before imports
vi.mock('../../src/session/manager.js', () => ({
  getSessionManager: vi.fn(() => ({
    exists: mockExists,
    updateStatus: mockUpdateStatus,
    get: mockGet,
  })),
}));

vi.mock('../../src/agent/index.js', () => ({
  processMessage: vi.fn().mockResolvedValue(undefined),
  cancelProcessing: vi.fn(),
}));

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

import {
  handleWebSocket,
  handleWebSocketMessage,
  handleWebSocketClose,
  broadcastToSession,
  getSessionConnections,
  getConnectionStats,
} from '../../src/ws.js';
import { processMessage, cancelProcessing } from '../../src/agent/index.js';
import { handlePermissionResponse } from '../../src/permission/handler.js';

// Mock WSContext
function createMockWSContext() {
  return {
    send: vi.fn(),
    close: vi.fn(),
  };
}

// Counter to generate unique session IDs for test isolation
let testCounter = 0;
function getUniqueSessionId(prefix = 'session') {
  return `${prefix}-${Date.now()}-${testCounter++}`;
}

describe('WebSocket Handler', () => {
  beforeEach(() => {
    vi.clearAllMocks();
    mockExists.mockReturnValue(false);
  });

  describe('handleWebSocket - 连接处理', () => {
    it('无效 session 发送错误并关闭连接', () => {
      const ws = createMockWSContext();
      mockExists.mockReturnValue(false);

      handleWebSocket(ws as any, 'invalid-session');

      expect(ws.send).toHaveBeenCalledWith(
        expect.stringContaining('"type":"error"')
      );
      expect(ws.send).toHaveBeenCalledWith(
        expect.stringContaining('Session not found')
      );
      expect(ws.close).toHaveBeenCalledWith(4004, 'Session not found');
    });

    it('有效 session 注册连接并发送 connected 消息', () => {
      const ws = createMockWSContext();
      mockExists.mockReturnValue(true);

      handleWebSocket(ws as any, 'session-1');

      expect(ws.close).not.toHaveBeenCalled();
      expect(ws.send).toHaveBeenCalledWith(
        expect.stringContaining('"type":"connected"')
      );
      expect(mockUpdateStatus).toHaveBeenCalledWith('session-1', 'active');
    });

    it('连接被添加到 connections map', () => {
      const ws = createMockWSContext();
      mockExists.mockReturnValue(true);

      handleWebSocket(ws as any, 'session-1');

      const connections = getSessionConnections('session-1');
      expect(connections.has(ws as any)).toBe(true);
    });
  });

  describe('handleWebSocketMessage - 消息处理', () => {
    beforeEach(() => {
      mockExists.mockReturnValue(true);
    });

    it('处理 message 类型消息', async () => {
      const ws = createMockWSContext();
      handleWebSocket(ws as any, 'session-1');

      const message = JSON.stringify({
        type: 'message',
        payload: { content: 'Hello AI' },
      });

      await handleWebSocketMessage(ws as any, 'session-1', message);

      // 应该广播 message_received 确认
      expect(ws.send).toHaveBeenCalledWith(
        expect.stringContaining('"type":"message_received"')
      );
      // 应该调用 processMessage
      expect(processMessage).toHaveBeenCalledWith('session-1', 'Hello AI', expect.any(Object));
    });

    it('处理 cancel 类型消息', async () => {
      const ws = createMockWSContext();
      handleWebSocket(ws as any, 'session-1');

      const message = JSON.stringify({ type: 'cancel' });
      await handleWebSocketMessage(ws as any, 'session-1', message);

      expect(cancelProcessing).toHaveBeenCalledWith('session-1');
      // 应该广播 cancelled 消息
      expect(ws.send).toHaveBeenCalledWith(
        expect.stringContaining('"type":"cancelled"')
      );
    });

    it('处理 permission_response 类型消息', async () => {
      const ws = createMockWSContext();
      const message = JSON.stringify({
        type: 'permission_response',
        payload: { requestId: 'req-123', allow: true, remember: false },
      });

      await handleWebSocketMessage(ws as any, 'session-1', message);

      expect(handlePermissionResponse).toHaveBeenCalledWith('req-123', true, false);
    });

    it('未知消息类型返回错误', async () => {
      const ws = createMockWSContext();
      const message = JSON.stringify({ type: 'unknown_type' });

      await handleWebSocketMessage(ws as any, 'session-1', message);

      expect(ws.send).toHaveBeenCalledWith(
        expect.stringContaining('"type":"error"')
      );
      expect(ws.send).toHaveBeenCalledWith(
        expect.stringContaining('Unknown message type')
      );
    });

    it('无效 JSON 返回错误', async () => {
      const ws = createMockWSContext();
      await handleWebSocketMessage(ws as any, 'session-1', 'invalid json');

      expect(ws.send).toHaveBeenCalledWith(
        expect.stringContaining('"type":"error"')
      );
    });

    it('处理 ArrayBuffer 数据', async () => {
      const ws = createMockWSContext();
      handleWebSocket(ws as any, 'session-1');

      const message = { type: 'message', payload: { content: 'ArrayBuffer test' } };
      const encoder = new TextEncoder();
      const buffer = encoder.encode(JSON.stringify(message)).buffer;

      await handleWebSocketMessage(ws as any, 'session-1', buffer);

      expect(processMessage).toHaveBeenCalledWith('session-1', 'ArrayBuffer test', expect.any(Object));
    });

    it('空 content 处理正确', async () => {
      const ws = createMockWSContext();
      handleWebSocket(ws as any, 'session-1');

      const message = JSON.stringify({
        type: 'message',
        payload: {},
      });

      await handleWebSocketMessage(ws as any, 'session-1', message);

      expect(processMessage).toHaveBeenCalledWith('session-1', '', expect.any(Object));
    });

    it('处理 Blob 数据', async () => {
      const ws = createMockWSContext();
      handleWebSocket(ws as any, 'session-1');

      const message = { type: 'message', payload: { content: 'Blob test' } };
      const blob = new Blob([JSON.stringify(message)]);

      await handleWebSocketMessage(ws as any, 'session-1', blob);

      expect(processMessage).toHaveBeenCalledWith('session-1', 'Blob test', expect.any(Object));
    });

    it('处理非标准数据类型（转为字符串）', async () => {
      const ws = createMockWSContext();

      // 使用一个对象作为数据，它会被 String() 转换
      const message = { type: 'cancel' };
      const objData = { toString: () => JSON.stringify(message) };

      await handleWebSocketMessage(ws as any, 'session-1', objData);

      expect(cancelProcessing).toHaveBeenCalledWith('session-1');
    });

    it('处理 tool_response 类型消息（TODO 场景）', async () => {
      const ws = createMockWSContext();
      const message = JSON.stringify({
        type: 'tool_response',
        payload: { toolId: 'tool-123', result: 'success' },
      });

      // 当前实现是 TODO，所以不会有任何处理
      await handleWebSocketMessage(ws as any, 'session-1', message);

      // 不应该发送错误消息
      expect(ws.send).not.toHaveBeenCalledWith(
        expect.stringContaining('"type":"error"')
      );
    });

    it('permission_response 无 requestId 时不调用 handler', async () => {
      const ws = createMockWSContext();
      const message = JSON.stringify({
        type: 'permission_response',
        payload: { allow: true },
      });

      await handleWebSocketMessage(ws as any, 'session-1', message);

      expect(handlePermissionResponse).not.toHaveBeenCalled();
    });

    it('permission_response handler 返回 false 时打印警告', async () => {
      const consoleWarnSpy = vi.spyOn(console, 'warn').mockImplementation(() => {});
      const { handlePermissionResponse: mockHandler } = await import('../../src/permission/handler.js');
      vi.mocked(mockHandler).mockReturnValue(false);

      const ws = createMockWSContext();
      const message = JSON.stringify({
        type: 'permission_response',
        payload: { requestId: 'unknown-req', allow: true },
      });

      await handleWebSocketMessage(ws as any, 'session-1', message);

      expect(consoleWarnSpy).toHaveBeenCalledWith(
        expect.stringContaining('unknown-req')
      );
      consoleWarnSpy.mockRestore();
    });
  });

  describe('handleWebSocketClose - 关闭处理', () => {
    it('从 connections 中移除连接', () => {
      const sessionId = getUniqueSessionId('close');
      const ws = createMockWSContext();
      mockExists.mockReturnValue(true);

      handleWebSocket(ws as any, sessionId);
      expect(getSessionConnections(sessionId).size).toBe(1);

      handleWebSocketClose(ws as any, sessionId);
      expect(getSessionConnections(sessionId).size).toBe(0);
    });

    it('最后一个连接关闭时更新 session 状态为 idle', () => {
      const sessionId = getUniqueSessionId('idle');
      const ws = createMockWSContext();
      mockExists.mockReturnValue(true);

      handleWebSocket(ws as any, sessionId);
      handleWebSocketClose(ws as any, sessionId);

      expect(mockUpdateStatus).toHaveBeenLastCalledWith(sessionId, 'idle');
    });

    it('多个连接时关闭一个不影响其他', () => {
      const sessionId = getUniqueSessionId('multi');
      const ws1 = createMockWSContext();
      const ws2 = createMockWSContext();
      mockExists.mockReturnValue(true);

      handleWebSocket(ws1 as any, sessionId);
      handleWebSocket(ws2 as any, sessionId);
      expect(getSessionConnections(sessionId).size).toBe(2);

      handleWebSocketClose(ws1 as any, sessionId);
      expect(getSessionConnections(sessionId).size).toBe(1);
      expect(getSessionConnections(sessionId).has(ws2 as any)).toBe(true);
    });
  });

  describe('broadcastToSession - 会话广播', () => {
    it('向所有连接发送消息', () => {
      const ws1 = createMockWSContext();
      const ws2 = createMockWSContext();
      mockExists.mockReturnValue(true);

      handleWebSocket(ws1 as any, 'session-1');
      handleWebSocket(ws2 as any, 'session-1');

      vi.clearAllMocks();

      broadcastToSession('session-1', {
        type: 'chunk',
        sessionId: 'session-1',
        payload: { content: 'test' },
      });

      expect(ws1.send).toHaveBeenCalledTimes(1);
      expect(ws2.send).toHaveBeenCalledTimes(1);
      expect(ws1.send).toHaveBeenCalledWith(expect.stringContaining('"type":"chunk"'));
    });

    it('无连接时不抛出错误', () => {
      expect(() => {
        broadcastToSession('non-existent', {
          type: 'chunk',
          sessionId: 'non-existent',
          payload: {},
        });
      }).not.toThrow();
    });

    it('发送失败时继续发送给其他连接', () => {
      mockExists.mockReturnValue(true);

      const ws1 = createMockWSContext();
      const ws2 = createMockWSContext();

      handleWebSocket(ws1 as any, 'session-1');
      handleWebSocket(ws2 as any, 'session-1');

      // Now set up ws1.send to throw
      ws1.send.mockImplementation(() => {
        throw new Error('Connection closed');
      });

      expect(() => {
        broadcastToSession('session-1', {
          type: 'chunk',
          sessionId: 'session-1',
          payload: {},
        });
      }).not.toThrow();

      expect(ws2.send).toHaveBeenCalled();
    });
  });

  describe('getSessionConnections - 获取会话连接', () => {
    it('返回会话的所有连接', () => {
      const sessionId = getUniqueSessionId('get-conns');
      const ws = createMockWSContext();
      mockExists.mockReturnValue(true);

      handleWebSocket(ws as any, sessionId);

      const connections = getSessionConnections(sessionId);
      expect(connections.size).toBe(1);
    });

    it('不存在的会话返回空 Set', () => {
      const connections = getSessionConnections('non-existent-unique-12345');
      expect(connections.size).toBe(0);
    });
  });

  describe('getConnectionStats - 连接统计', () => {
    it('返回正确的统计信息', () => {
      // Get initial stats to account for connections from previous tests
      const initialStats = getConnectionStats();

      const sessionId1 = getUniqueSessionId('stats-1');
      const sessionId2 = getUniqueSessionId('stats-2');
      const ws1 = createMockWSContext();
      const ws2 = createMockWSContext();
      const ws3 = createMockWSContext();

      mockExists.mockReturnValue(true);

      handleWebSocket(ws1 as any, sessionId1);
      handleWebSocket(ws2 as any, sessionId1);
      handleWebSocket(ws3 as any, sessionId2);

      const stats = getConnectionStats();
      // We added 2 sessions and 3 connections
      expect(stats.sessions).toBe(initialStats.sessions + 2);
      expect(stats.connections).toBe(initialStats.connections + 3);
    });
  });
});