"""
物流小车控制指令 - 校验和算法工具（交互式）

用法:
  python checksum.py    # 启动交互模式，手动输入指令计算校验和
"""

import sys
import io

if sys.platform == 'win32':
    sys.stdout = io.TextIOWrapper(sys.stdout.buffer, encoding='utf-8', errors='replace')
    sys.stderr = io.TextIOWrapper(sys.stderr.buffer, encoding='utf-8', errors='replace')


def calc_checksum(data: str) -> str:
    """计算校验和：ASCII码求和 % 256 → 2位十六进制"""
    total = sum(ord(c) for c in data)
    return format(total % 256, '02X')


def print_ascii_detail(data: str):
    """打印每个字符的 ASCII 码值"""
    print(f"\n  原始字符串: {data}")
    print(f"  ASCII 码分解:")

    total = 0
    parts = []
    for c in data:
        val = ord(c)
        total += val
        parts.append(f"'{c}'({val})")

    print("    " + " + ".join(parts))
    print(f"  总和 = {total}")
    print(f"  取余 = {total} % 256 = {total % 256}")
    print(f"  十六进制 = {calc_checksum(data)}")


def main():
    print("\n" + "=" * 55)
    print("  物流小车指令校验和工具（交互式）")
    print("  输入原始字符串，自动计算校验和并生成完整指令")
    print("  输入 q 退出")
    print("=" * 55)

    while True:
        print(f"\n{'─' * 55}")
        raw = input("\n  请输入指令内容（如 LOGI:GS:001）: ").strip()

        if raw.lower() in ('q', 'quit', 'exit'):
            print("\n  再见！\n")
            break

        if not raw:
            continue

        # 如果用户输入的不是以 LOGI: 开头，自动拼接
        if not raw.upper().startswith('LOGI:'):
            print(f"\n  [提示] 检测到未包含帧头，已自动添加 LOGI:")
            raw = 'LOGI:' + raw

        cs = calc_checksum(raw)
        full_cmd = f"{raw}:{cs}#"

        # 显示计算过程
        print_ascii_detail(raw)
        print(f"\n  >>> 完整指令: {full_cmd}")


if __name__ == '__main__':
    main()