#!/usr/bin/python

from nilmdb.client.httpclient import HTTPClient, ClientError, ServerError
from nilmdb.utils.printf import *
import nilmrun

import argparse
import os
import time
import sys

def main():
    """Run a command on the NilmRun server"""
    def_url = os.environ.get("NILMRUN_URL", "http://localhost/nilmrun/")
    parser = argparse.ArgumentParser(
        description = 'Run a command on the NilmRun server',
        formatter_class = argparse.ArgumentDefaultsHelpFormatter)
    parser.add_argument("-V", "--version", action="version",
                        version = nilmrun.__version__)
    group = parser.add_argument_group("Standard options")
    group.add_argument('-u', '--url',
                       help = 'NilmRun server URL', default = def_url)
    group.add_argument('-n', '--noverify', action="store_true",
                       help = 'Disable SSL certificate verification')
    group = parser.add_argument_group("Program")
    group.add_argument('-d', '--detach', action="store_true",
                       help = 'Run process and return immediately without '
                       'printing its output')
    group.add_argument('cmd', help="Command to run")
    group.add_argument('arg', nargs=argparse.REMAINDER,
                       help="Arguments for command")
    args = parser.parse_args()

    client = HTTPClient(baseurl = args.url, verify_ssl = not args.noverify)

    # Run command
    pid = client.post("run/command", { "argv": [ args.cmd ] + args.arg })

    # If we're detaching, just print the PID
    if args.detach:
        print pid
        raise SystemExit(0)

    # Otherwise, watch the log output, and kill the process when it's done
    # or when this script terminates.
    try:
        while True:
            s = client.get("process/status", { "pid": pid, "clear": 1 })
            sys.stdout.write(s['log'])
            sys.stdout.flush()
            if not s['alive']:
                break
            time.sleep(1)
    finally:
        s = client.post("process/remove", { "pid": pid })

    raise SystemExit(s['exitcode'])

if __name__ == "__main__":
    main()