import socket
import struct
import logging
import time
from datetime import datetime
import binascii



class Command02:
    def __init__(self):
        self.command = 0x02  # 回复命令码02H
        self.qr_fixed = "https://platform.enneagon.cn/ScanCharging?connectorCode="

    def parse_pile_id(self, pile_id_bytes):
        """解析桩号"""
        try:
            vendor_id = struct.unpack("<H", pile_id_bytes[0:2])[0]  # 运营商编号
            gun_info = pile_id_bytes[2]  # 枪数量信息

            if gun_info <= 31:
                gun_type = "交流"
                gun_count = gun_info
            elif 51 <= gun_info <= 81:
                gun_type = "直流"
                gun_count = gun_info - 50
            else:
                gun_type = "未知"
                gun_count = gun_info

            site_id = int.from_bytes(pile_id_bytes[3:6], 'little')  # 站点编号
            addr_in_site = struct.unpack("<H", pile_id_bytes[6:8])[0]  # 站内桩地址

            return {
                "vendor_id": f"{vendor_id:04d}",
                "gun_type": gun_type,
                "gun_count": gun_count,
                "site_id": f"{site_id:06d}",
                "addr_in_site": f"{addr_in_site:04d}"
            }
        except Exception as e:
            logging.error(f"Parse pile ID failed: {str(e)}")
            print(f"解析桩号失败: {str(e)}")
            return None

    def validate_frame(self, data):
        """验证帧格式"""
        try:
            print("\n开始验证帧格式:")
            print(f"数据内容: {data.hex().upper()}")
            print(f"数据长度: {len(data)}字节")

            # 1. 基本格式检查
            if len(data) < 14:
                print("数据长度不足14字节")
                return False

            if data[0:2] != b'JX':
                print("帧起始标志不是'JX'")
                return False

            # 2. 获取数据域长度
            data_len = struct.unpack("<H", data[12:14])[0]
            expected_total_len = 14 + data_len + 1  # 头部(14) + 数据域 + 校验码(1)

            # 如果数据长度不匹配，尝试修正数据
            if len(data) != expected_total_len:
                print(f"数据长度不匹配，尝试修正...")
                if len(data) > expected_total_len:
                    print(f"截断多余数据")
                    data = data[:expected_total_len]
                else:
                    print("数据不完整")
                    return False

            # 3. 显示数据结构
            print(f"\n数据结构分析:")
            print(f"起始标识: {data[0:2].hex().upper()}")
            print(f"命令字: {data[2]:02X}")
            print(f"桩号: {data[3:11].hex().upper()}")
            print(f"加密方式: {data[11]:02X}")
            print(f"数据长度: {data_len}")
            print(f"数据域: {data[14:14 + data_len].hex().upper()}")
            print(f"校验码: {data[-1]:02X}")

            # 4. 校验码验证
            check_data = data[2:-1]
            calculated_check = 0
            for b in check_data:
                calculated_check ^= b

            if calculated_check != data[-1]:
                print(f"校验码不匹配: 计算值={calculated_check:02X}, 接收值={data[-1]:02X}")
                return False

            return True

        except Exception as e:
            print(f"验证帧格式异常: {str(e)}")
            return False

    def debug_print_fields(self, data):
        """打印数据包的详细字段"""
        print("\n===== 数据包解析 =====")
        print("1. 固定头部:")
        print(f"  起始标识 (2字节): {data[0:2].hex().upper()}")
        print(f"  命令码 (1字节): {data[2]:02X}")
        print(f"  桩号 (8字节): {data[3:11].hex().upper()}")
        print(f"  加密方式 (1字节): {data[11]:02X}")
        print(f"  数据域长度 (2字节): {struct.unpack('<H', data[12:14])[0]}")

        data_len = struct.unpack("<H", data[12:14])[0]
        print("\n2. 数据域:")
        print(f"  时间标识 (6字节): {data[14:20].hex().upper()}")
        print(f"  密钥版本 (2字节): {data[20:22].hex().upper()}")
        print(f"  校验密文 (8字节): {data[22:30].hex().upper()}")

        print(f"\n3. 校验码 (1字节): {data[-1]:02X}")

        # 检查是否有多余字节
        expected_len = 14 + data_len + 1
        if len(data) > expected_len:
            print(f"\n警告: 发现多余字节:")
            print(f"多余字节内容: {data[expected_len:].hex().upper()}")

    def parse_01h(self, data):
        """解析01H命令数据"""
        try:
            print("\n开始解析01H命令...")
            if not self.validate_frame(data):
                raise ValueError("帧格式验证失败")

            # 提取基本信息
            command = data[2]
            pile_id = data[3:11]
            encrypt_mode = data[11]
            data_field = data[14:-1]  # 从数据域开始到校验码之前

            # 解析数据域内容
            time_bytes = data_field[0:6]
            year = time_bytes[0] + 2000
            month, day, hour, minute, second = time_bytes[1:6]
            timestamp = f"{year:04d}-{month:02d}-{day:02d} {hour:02d}:{minute:02d}:{second:02d}"

            key_version = struct.unpack("<H", data_field[6:8])[0]
            check_text = data_field[8:16]

            result = {
                "command": command,
                "pile_id": pile_id,
                "encrypt_mode": encrypt_mode,
                "timestamp": timestamp,
                "key_version": key_version,
                "check_text": check_text
            }

            return result
        except Exception as e:
            print(f"解析失败: {str(e)}")
            return None

    def build_02h_response(self, pile_id, allow=True, reject_reason=0):
        """构建02H响应命令"""
        try:
            frame = bytearray()
            frame.extend(b'JX')  # 帧起始标志
            frame.append(self.command)  # 命令
            frame.extend(pile_id)  # 桩号
            frame.append(0x01)  # 数据加密方式

            data = bytearray()

            # 添加时间标识 (6字节)
            now = datetime.now()
            data.extend(struct.pack("<BBBBBB",
                                    now.year - 2000, now.month, now.day,
                                    now.hour, now.minute, now.second))

            # 添加请求结果和拒绝原因
            data.append(0x01 if allow else 0x02)
            data.append(reject_reason)

            if allow:
                # 添加二维码固定段 (100字节)
                fixed_part = self.qr_fixed.encode()
                data.extend(fixed_part.ljust(100, b'\x00'))

                # 添加二维码枪号段数量
                data.append(0x02)  # 2个充电枪

                # 添加枪号段 (每个20字节)
                pile_id_str = ''.join([f"{b:02X}" for b in pile_id])
                gun1 = f"{pile_id_str}001"
                gun2 = f"{pile_id_str}002"
                data.extend(gun1.encode().ljust(20, b'\x00'))
                data.extend(gun2.encode().ljust(20, b'\x00'))

            # 添加数据域长度
            frame.extend(struct.pack("<H", len(data)))

            # 添加数据域
            frame.extend(data)

            # 计算并添加校验码
            check = 0
            for b in frame[2:]:  # 从命令字节开始异或
                check ^= b
            frame.append(check)

            return bytes(frame)

        except Exception as e:
            logging.error(f"构建02H响应失败: {str(e)}")
            return None

    def process_and_respond(self, received_data, sock):
        """处理收到的01H命令并回复02H"""
        try:
            # 基础验证
            if not self.validate_frame(received_data):
                logging.error("01H命令帧格式验证失败")
                return False

            # 提取必要信息
            pile_id = received_data[3:11]  # 桩号
            time_bytes = received_data[14:20]  # 时间标识
            key_version = struct.unpack("<H", received_data[20:22])[0]  # 密钥版本

            # 检查时间是否在合理范围内
            cmd_time = datetime(2000 + time_bytes[0], time_bytes[1], time_bytes[2],
                                time_bytes[3], time_bytes[4], time_bytes[5])
            time_diff = abs((datetime.now() - cmd_time).total_seconds())

            if time_diff > 600:  # 超过10分钟
                logging.warning(f"时间差异过大: {time_diff}秒")
                response = self.build_02h_response(pile_id, False, 6)  # 拒绝原因6-时差过大
            else:
                # 这里可以添加更多的验证逻辑
                response = self.build_02h_response(pile_id, True, 0)

            if response and hasattr(sock, 'send'):
                sock.send(response)
                logging.info(f"成功发送02H响应, 长度: {len(response)}字节")
                return True

            return False

        except Exception as e:
            logging.error(f"处理01H命令失败: {str(e)}")
            return False


def test_command():
    """测试函数"""
    print("开始测试01H/02H命令处理...")

    # 创建响应处理器
    handler = Command02()

    # 原始测试数据
    hex_string = "4A5801031767631136065701100019010909371501000000000000000000004D"

    # 解析数据长度字段以确定正确的数据包长度
    expected_len = 14 + 16 + 1  # 头部(14字节) + 数据域(16字节) + 校验码(1字节)

    # 确保只取需要的字节
    test_data = bytes.fromhex(hex_string[:expected_len * 2])  # *2是因为hex字符串中一个字节用两个字符表示

    print("\n测试数据:")
    print(f"原始数据: {hex_string}")
    print(f"处理后数据: {test_data.hex().upper()}")
    print(f"数据长度: {len(test_data)}字节")

    # 打印详细字段解析
    handler.debug_print_fields(test_data)

    # 创建模拟socket
    class MockSocket:
        def send(self, data):
            print(f"\n模拟发送响应数据:")
            print(f"数据内容: {data.hex().upper()}")
            print(f"数据长度: {len(data)}字节")

    mock_sock = MockSocket()

    # 测试完整处理流程
    result = handler.process_and_respond(test_data, mock_sock)
    print(f"\n最终处理结果: {'成功' if result else '失败'}")


if __name__ == "__main__":
    test_command()