#!/usr/bin/env python3
"""
simple client for que.run
"""

import argparse
import subprocess
import sys
import time
import urllib.parse
import urllib.request as request

MAX_TIMEOUT = 99999999  # basically never timeout


def send(args):
    "Send a message to the que."
    data = args.infile.read().encode("utf-8").strip()
    req = request.Request(f"{args.host}/{args.target}")
    req.add_header("User-AgenT", "Que/Client")
    if args.serve:
        while not time.sleep(1):
            with request.urlopen(req, data=data, timeout=MAX_TIMEOUT) as req:
                pass
    else:
        with request.urlopen(req, data=data, timeout=MAX_TIMEOUT) as req:
            pass


def recv(args):
    "Receive a message from the que."

    def _recv(_req):
        msg = _req.readline().decode("utf-8").strip()
        print(msg)
        if args.then:
            subprocess.run(
                args.then.replace("\msg", msg).replace("\que", args.target), shell=True
            )

    params = urllib.parse.urlencode({"poll": args.poll})
    req = request.Request(f"{args.host}/{args.target}?{params}")
    req.add_header("User-Agent", "Que/Client")

    with request.urlopen(req) as _req:
        if args.poll:
            while not time.sleep(1):
                _recv(_req)
        else:
            _recv(_req)


def get_args():
    cli = argparse.ArgumentParser(description=__doc__)
    cli.add_argument(
        "--host", default="http://que.run", help="where que-server is running"
    )
    cli.add_argument(
        "--poll", default=False, action="store_true", help="stream data from the que"
    )
    cli.add_argument(
        "--then",
        help=" ".join(
            [
                "when polling, run this shell command after each response,",
                "presumably for side effects,"
                "replacing '\que' with the target and '\msg' with the body of the response",
            ]
        ),
    )
    cli.add_argument(
        "--serve",
        default=False,
        action="store_true",
        help=" ".join(
            [
                "when posting to the que, do so continuously in a loop.",
                "this can be used for serving a webpage or other file continuously",
            ]
        ),
    )
    cli.add_argument(
        "target", help="namespace and path of the que, like 'ns/path/subpath'"
    )
    cli.add_argument(
        "infile",
        nargs="?",
        type=argparse.FileType("r"),
        help="data to put on the que. Use '-' for stdin, otherwise should be a readable file",
    )
    return cli.parse_args()


if __name__ == "__main__":
    try:
        args = get_args()
        if args.infile:
            send(args)
        else:
            recv(args)
    except KeyboardInterrupt:
        sys.exit(0)
    except urllib.error.HTTPError as e:
        print(e)
        sys.exit(1)