#!/usr/bin/env python3
"""Standalone host probe — no package install, no git needed (stdlib only).

Drop this file on the machine joined to the aGate SoftAP and run:
    python3 host_probe2.py --sn A03X2516013210060005

Replicates ``battery --probe2``: the canonical queryAPowerData envelope
(verified byte-for-byte against the Dart AOT disassembly) sent with
transport-level variants. Prints exact TX/RX hex for each.
"""

import argparse
import json
import socket
import time
import zlib

SNNO = [0]  # 1-based increaseSN counter (wraps at 9999)


def secret_key(sn):
    return format(sum(sn.encode()) & 0xFF, "x")


def build_envelope(sn, cmd=25, data=None, snno=None, ts=None):
    SNNO[0] = (SNNO[0] % 9999) + 1
    env = {
        "cmdType": cmd,
        "equipNo": sn,
        "type": 0,
        "timeStamp": ts if ts is not None else int(time.time()),
        "snno": snno if snno is not None else SNNO[0],
        "len": 0,
        "crc": "",
    }
    if data:
        compact = json.dumps(data, separators=(",", ":"))
        env["len"] = len(compact.encode())
        env["crc"] = format(zlib.crc32(compact.encode()), "X")
        env["dataArea"] = data
    return json.dumps(env, separators=(",", ":"))


def encrypt(json_str, key):
    parts = json_str.split(",")
    a = (parts[0] + "," + parts[1] + ",").encode()
    b = ",".join(parts[2:]).encode()
    n = int(key, 32)
    return a + bytes((b[i] + i + len(a) + n) & 0xFF
                     for i in range(len(b)))


def recv_all(sock, idle=4.0):
    out = bytearray()
    sock.settimeout(idle)
    while True:
        try:
            chunk = sock.recv(65536)
        except (socket.timeout, TimeoutError):
            break
        if not chunk:
            break
        out.extend(chunk)
    return bytes(out)


MQTT_CONNECT = bytes.fromhex("101200044d5154540402003c000670726f62653031")


def run(label, host, port, tx, timeout, pre_read=0.0, post_idle=4.0,
        split_send=False):
    entry = (label, tx, b"", b"", None)
    rx_pre, rx = b"", b""
    err = None
    try:
        with socket.create_connection((host, port),
                                      timeout=timeout) as sock:
            if pre_read:
                rx_pre = recv_all(sock, idle=pre_read)
            if tx:
                if split_send:
                    half = len(tx) // 2
                    sock.sendall(tx[:half])
                    try:
                        sock.settimeout(0.5)
                        rx_pre += sock.recv(65536)
                    except (socket.timeout, TimeoutError):
                        pass
                    sock.sendall(tx[half:])
                else:
                    sock.sendall(tx)
                rx = recv_all(sock, idle=post_idle)
    except (ConnectionError, socket.error, TimeoutError) as exc:
        err = "%s: %s" % (type(exc).__name__, exc)
    print("--- %s -> %s:%d" % (label, host, port))
    print("  tx (%d B): %s" % (len(tx), tx.hex() or "(none)"))
    if rx_pre:
        print("  rx_pre (%d B): %s" % (len(rx_pre), rx_pre.hex()))
    print("  rx (%d B): %s" % (len(rx), rx.hex() or "(empty)"))
    if err:
        print("  error: %s" % err)
    return rx


def main():
    ap = argparse.ArgumentParser()
    ap.add_argument("--sn", required=True)
    ap.add_argument("--host", default="10.100.1.1")
    ap.add_argument("--ports", default="9000")
    ap.add_argument("--timeout", type=float, default=5.0)
    args = ap.parse_args()

    key = secret_key(args.sn)
    print("secret key for %s: %s (radix 32)" % (args.sn, key))
    tx = encrypt(build_envelope(args.sn, data={"update": 2}), key)
    for port in [int(p) for p in args.ports.split(",") if p.strip()]:
        run("greet-first/read-then-raw", args.host, port, tx,
            args.timeout, pre_read=4.0)
        run("raw/long-read", args.host, port, tx, args.timeout,
            post_idle=8.0)
        run("raw/split-send", args.host, port, tx, args.timeout,
            split_send=True)
        run("le16-prefix", args.host, port,
            len(tx).to_bytes(2, "little") + tx, args.timeout)
        run("be16-prefix", args.host, port,
            len(tx).to_bytes(2, "big") + tx, args.timeout)
        run("le32-prefix", args.host, port,
            len(tx).to_bytes(4, "little") + tx, args.timeout)
        run("mqtt-connect", args.host, port, MQTT_CONNECT, args.timeout)


if __name__ == "__main__":
    main()