"""native_enc_diff.py — CAN 输出编码回归（不碰网卡，无 Python 后端依赖）。

阶段 4 切换后 Python 基准已删除；本脚本改为对照 native_enc_golden.json
（阶段 2 与 Python _fill_can_out 逐字节对拍通过后固化的 4 组用例）。
byte0 是 seq（守护进程状态相关，每次 enctest 都 +1），不参与比对；
其余 383 字节必须逐字节一致，另校验 seq 两两 +1(跳 0) 的递增语义。

用法：native 在 8090 跑着即可（不需要 open/OP）：python native_enc_diff.py
重新生成金标准（需 legacy 备份里的 ecat_server.py，一般不需要）：见 git 历史/zip。
"""
import json
import sys
import urllib.request

GOLDEN = "native_enc_golden.json"
URL = "http://127.0.0.1:8090/api/native/enctest"


def main():
    g = json.load(open(GOLDEN, encoding="utf-8"))
    cases = g["cases"]
    body = {"cases": CASES}
    req = urllib.request.Request(URL, data=json.dumps(body).encode(),
                                 headers={"Content-Type": "application/json"})
    with urllib.request.urlopen(req) as r:
        d = json.loads(r.read())
    got = d["hexes"]
    ok = True
    if len(got) != len(cases):
        print(f"用例数不符: golden={len(cases)} native={len(got)}")
        return 1
    for i, (a, b) in enumerate(zip(cases, got)):
        if a[2:] != b[2:]:
            ok = False
            diff = [j for j in range(2, len(a), 2) if a[j:j+2] != b[j:j+2]]
            print(f"用例 {i}: 不一致！差异字节偏移 {diff[:12]}")
            j = diff[0]
            print(f"  golden[{j}:{j+24}] = {a[j:j+24]}")
            print(f"  native[{j}:{j+24}] = {b[j:j+24]}")
        else:
            print(f"用例 {i}: ✅ 383B 逐字节一致(byte0=seq 除外)")
    seqs = [int(h[:2], 16) for h in got]

    def nxt(s):
        s = (s + 1) & 0xFF
        return 1 if s == 0 else s
    inc = all(seqs[i + 1] == nxt(seqs[i]) for i in range(len(seqs) - 1))
    print(f"seq 递增: {seqs} {'✅' if inc else '❌'}")
    return 0 if ok and inc else 1


# 与阶段 2 对拍时同一组用例（纯数据）。改动这里 = 改动金标准语义，
# 必须连同 native_enc_golden.json 一起重新生成。
CASES = [
    # 基础单帧：DLC32 电机 CMD
    {"win": 0, "ch": 1, "id": 0x30200, "dlc": 32, "data": bytes(range(32)).hex(), "batch": []},
    # 批量边界：20×DLC8（332B 区，每项 16B → 20 项 320B，第 21 项 336>332 越界）
    {"win": 5, "ch": 0, "id": 0x123, "dlc": 8, "data": "AABBCCDDEEFF0011",
     "batch": [{"ch": 1, "id": 0x300 + i, "dlc": 8, "data": "0102030405060708"} for i in range(21)]},
    # dlc=0 只发批量；6×DLC64（每项 72B → 4 项 288B，第 5 项 360 越界）
    {"win": 20, "ch": 2, "id": 0, "dlc": 0, "data": "",
     "batch": [{"ch": 2, "id": 0xFFFFF, "dlc": 64, "data": "EE" * 64} for _ in range(6)]},
    # 混合 DLC + win 保持
    {"win": 255, "ch": 1, "id": 7, "dlc": 32, "data": "11" * 32,
     "batch": [{"ch": 0, "id": 9, "dlc": 32, "data": "22" * 32},
               {"ch": 1, "id": 10, "dlc": 4, "data": "33445566"},
               {"ch": 2, "id": 11, "dlc": 12, "data": "55" * 12}]},
]


if __name__ == "__main__":
    sys.exit(main())