#!/usr/bin/env python3

import time
import websocket
import argparse
import zlib
from websocket import WebSocketTimeoutException

parser = argparse.ArgumentParser(description='Update fiatlux firmware via websocket.')
parser.add_argument("binfile")

args = parser.parse_args()

bs = 1024


def parse_reply(bytes):
    cmd = bytes[0:1].decode("utf-8")
    ret = int.from_bytes(bytes[1:2], "big")
    val = int.from_bytes(bytes[2:4], "big")
    return {'cmd': cmd, 'ret': ret, 'val': val}


with open(args.binfile, "rb") as f:
    try:
        ws = websocket.WebSocket()
        print("send {}".format(args.binfile))
        ws.connect("ws://172.16.0.1")
        i = 0
        bytes = f.read()
        rolling = zlib.crc32(bytes)
        total = len(bytes)
        while True:
            chunk = bytes[bs * i:bs * i + bs]
            msg = b'F\x00\x00\x00'
            msg += i.to_bytes(2, 'big')
            msg += len(chunk).to_bytes(2, 'big')
            msg += (zlib.crc32(chunk) & 0xffffffff).to_bytes(4, 'big')
            msg += chunk
            ws.send(msg)
            print("\r{:6.2f}%".format(100 * i * bs / total), end='')
            reply = parse_reply(ws.recv())
            if reply['cmd'] == 'F' and reply['ret'] == 0:
                i += 1
            elif reply['cmd'] == 'F' and reply['ret'] == 1:
                print("Error: SEQUENCE_OUT_OF_ORDER")
                i = reply['val']
            elif reply['cmd'] == 'F' and reply['ret'] == 2:
                print("Error: CHECKSUM_MISMATCH")
                i = reply['val']
            else:
                print(reply)

            time.sleep(0.05)
            if len(chunk) != bs:
                break

        print("\rdone      ")
        msg = b'C\x00\x00\x00'
        msg += total.to_bytes(4, 'big')
        msg += (rolling).to_bytes(4, 'big')
        ws.settimeout(5)
        ws.send(msg)
        reply = parse_reply(ws.recv())
        print(reply)
        ws.close()
    except WebSocketTimeoutException:
        pass
    except ConnectionResetError:
        pass
    except KeyboardInterrupt:
        pass