import socket
import json
import time
import sys
from datetime import datetime

# 设置标准输出编码为 UTF-8（解决 Windows 控制台编码问题）
if sys.platform.startswith('win'):
    import codecs
    sys.stdout = codecs.getwriter('utf-8')(sys.stdout.detach())
    sys.stderr = codecs.getwriter('utf-8')(sys.stderr.detach())
    # 设置标准输入编码
    sys.stdin = codecs.getreader('utf-8')(sys.stdin.detach())

class JSONSocketClient:
    def __init__(self, host='localhost', port=8888):
        self.host = host
        self.port = port
        self.socket = None
        self.connected = False
    
    def connect(self):
        """连接到服务器"""
        try:
            self.socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
            self.socket.connect((self.host, self.port))
            self.connected = True
            print(f"✅ 已连接到服务器 {self.host}:{self.port}")
            return True
        except Exception as e:
            print(f"❌ 连接失败: {e}")
            return False
    
    def disconnect(self):
        """断开连接"""
        if self.socket:
            self.socket.close()
            self.connected = False
            print("🔌 已断开连接")
    
    def send_request(self, request):
        """发送请求并接收响应"""
        if not self.connected:
            print("❌ 未连接到服务器")
            return None
        
        try:
            # 发送请求
            request_json = json.dumps(request, ensure_ascii=False)
            self.socket.send(request_json.encode('utf-8'))
            print(f"📤 发送请求: {request_json}")
            
            # 接收响应
            response_data = self.socket.recv(4096).decode('utf-8')
            response = json.loads(response_data)
            print(f"📥 收到响应: {json.dumps(response, ensure_ascii=False, indent=2)}")
            
            return response
            
        except Exception as e:
            print(f"❌ 请求失败: {e}")
            return None
    
    def send_message(self, message):
        """发送普通消息（非 JSON 格式）"""
        if not self.connected:
            print("❌ 未连接到服务器")
            return None
        
        try:
            self.socket.send(message.encode('utf-8'))
            print(f"📤 发送消息: {message}")
            
            response_data = self.socket.recv(4096).decode('utf-8')
            response = json.loads(response_data)
            print(f"📥 收到响应: {json.dumps(response, ensure_ascii=False, indent=2)}")
            
            return response
            
        except Exception as e:
            print(f"❌ 发送消息失败: {e}")
            return None
    
    def get_file(self, filename='test_data.json'):
        """从服务器获取文件"""
        request = {
            "command": "get_file",
            "filename": filename,
            "timestamp": datetime.now().isoformat()
        }
        return self.send_request(request)
    
    def save_file(self, filename, content):
        """保存文件到服务器"""
        request = {
            "command": "save_file",
            "filename": filename,
            "content": content,
            "timestamp": datetime.now().isoformat()
        }
        return self.send_request(request)
    
    def list_files(self):
        """列出服务器上的 JSON 文件"""
        request = {
            "command": "list_files",
            "timestamp": datetime.now().isoformat()
        }
        return self.send_request(request)
    
    def ping(self):
        """测试服务器连接"""
        request = {
            "command": "ping",
            "timestamp": datetime.now().isoformat()
        }
        return self.send_request(request)
    
    def interactive_mode(self):
        """交互模式"""
        print("\n🎮 进入交互模式")
        print("可用命令:")
        print("  1. get <filename>     - 获取文件")
        print("  2. save <filename>    - 保存文件（会提示输入内容）")
        print("  3. list              - 列出文件")
        print("  4. ping              - 测试连接")
        print("  5. msg <message>     - 发送普通消息")
        print("  6. quit              - 退出")
        print()
        
        while self.connected:
            try:
                command = input("👉 请输入命令: ").strip()
                
                if not command:
                    continue
                
                parts = command.split(' ', 1)
                cmd = parts[0].lower()
                
                if cmd == 'quit':
                    break
                elif cmd == 'get':
                    filename = parts[1] if len(parts) > 1 else 'test_data.json'
                    self.get_file(filename)
                elif cmd == 'save':
                    filename = parts[1] if len(parts) > 1 else 'new_data.json'
                    print("请输入要保存的 JSON 内容（输入空行结束）:")
                    lines = []
                    while True:
                        line = input()
                        if not line:
                            break
                        lines.append(line)
                    
                    if lines:
                        try:
                            content = json.loads('\n'.join(lines))
                            self.save_file(filename, content)
                        except json.JSONDecodeError as e:
                            print(f"❌ JSON 格式错误: {e}")
                elif cmd == 'list':
                    self.list_files()
                elif cmd == 'ping':
                    self.ping()
                elif cmd == 'msg':
                    message = parts[1] if len(parts) > 1 else "Hello Server!"
                    self.send_message(message)
                else:
                    print(f"❌ 未知命令: {cmd}")
                
                print()  # 空行分隔
                
            except KeyboardInterrupt:
                break
            except Exception as e:
                print(f"❌ 命令执行错误: {e}")
        
        print("👋 退出交互模式")

def test_client():
    """测试客户端功能"""
    client = JSONSocketClient()
    
    print("🧪 开始测试客户端...")
    
    # 连接服务器
    if not client.connect():
        return
    
    try:
        # 测试 1: Ping
        print("\n--- 测试 1: Ping ---")
        client.ping()
        
        # 测试 2: 列出文件
        print("\n--- 测试 2: 列出文件 ---")
        client.list_files()
        
        # 测试 3: 获取文件
        print("\n--- 测试 3: 获取文件 ---")
        client.get_file('test_data.json')
        
        # 测试 4: 保存文件
        print("\n--- 测试 4: 保存文件 ---")
        test_content = {
            "message": "这是客户端测试数据",
            "timestamp": datetime.now().isoformat(),
            "data": {
                "name": "测试用户",
                "age": 25,
                "hobbies": ["编程", "音乐", "阅读"]
            }
        }
        client.save_file('client_test.json', test_content)
        
        # 测试 5: 发送普通消息
        print("\n--- 测试 5: 发送普通消息 ---")
        client.send_message("Hello Server! This is a test message.")
        
        print("\n✅ 所有测试完成！")
        
    finally:
        client.disconnect()

if __name__ == "__main__":
    import sys
    
    if len(sys.argv) > 1 and sys.argv[1] == 'test':
        # 运行测试
        test_client()
    else:
        # 交互模式
        client = JSONSocketClient()
        if client.connect():
            try:
                client.interactive_mode()
            finally:
                client.disconnect()