#!/usr/bin/env python3

import argparse
import os
import shlex
import subprocess
import sys
import threading
import yaml
sys.path.insert(0, os.getcwd())
import mkconfig

# The default manifest file
MANIFEST = "manifest.yaml"

# The default pubkeys file
PUBKEYS = "pubkeys.yaml"

# The TEEMS binary
TEEMS = "./teems"

def launch(node, manifest, config, cmd, log_folder, epoch_time, num_epochs, num_WN):
    manifestdata = manifest[node]
    cmdline = ''
    if 'launchprefix' in manifestdata:
        cmdline = manifestdata['launchprefix'] + ' '
    cmdline += TEEMS + " -k %s -n %s" % (manifestdata['sprvfile'], node)

    if(epoch_time):
        cmdline+= ' -d ' + str(epoch_time)

    if(num_epochs):
        cmdline+= ' -e ' + str(num_epochs)

    if(num_WN):
        cmdline+= ' -w ' + str(num_WN)

    if 'args' in manifestdata:
        cmdline += ' ' + manifestdata['args']

    log_name = None
    stdout_file = subprocess.PIPE
    if(log_folder):
        log_name = log_folder + node + ".log"
        stdout_file = open(log_name, "a+")

    print(cmdline)
    proc = subprocess.Popen(shlex.split(cmdline) + cmd,
        stdin=subprocess.PIPE, stdout=stdout_file,
        stderr=subprocess.STDOUT, bufsize=0)
    proc.stdin.write(config.encode('utf-8'))

    if(log_folder == None):
        while True:
            line = proc.stdout.readline()
            if not line:
                break
            print(node + ": " + line.decode('utf-8'), end='', flush=True)
    else:
        stdout_file.close()


if __name__ == "__main__":
    aparse = argparse.ArgumentParser(
        description='Launch TEEMS nodes'
    )
    aparse.add_argument('-m', default=MANIFEST,
        help='manifest.yaml file')
    aparse.add_argument('-p', default=PUBKEYS,
        help='pubkeys.yaml file')
    aparse.add_argument('-z', default=None,
        help='override message size')
    aparse.add_argument('-u', default=None,
        help='override max number of users')
    aparse.add_argument('-B', default=None,
        help='override max number of outgoing private messages per user per epoch')
    aparse.add_argument('-b', default=None,
        help='override max number of incoming private messages per user per epoch')
    aparse.add_argument('-C', default=None,
        help='override max number of outgoing public messages per user per epoch')
    aparse.add_argument('-c', default=None,
        help='override max number of incoming public messages per user per epoch')
    aparse.add_argument('-l', default=None,
        help='log folder to store logs of each server in an experiment')
    aparse.add_argument('-d', default=None,
        help='Set epoch interval time in seconds')
    aparse.add_argument('-e', default=None,
        help='Set number of epochs')
    aparse.add_argument('-w', default=None,
        help='Set number of Waksman Networks to precompute before starting epochs')
    aparse.add_argument('-r', default=None,
        help='override if routing private channel messages (or public)')
    aparse.add_argument('-n', nargs='*', help='nodes to include')
    aparse.add_argument('cmd', nargs='*', help='experiment to run')
    args = aparse.parse_args()

    with open(args.m) as mf:
        manifest = yaml.safe_load(mf)

    params_overrides = {
        'msg_size': args.z,
        'user_count': args.u,
        'priv_out': args.B,
        'priv_in': args.b,
        'pub_out': args.C,
        'pub_in': args.c,
        'private_routing': args.r
    }

    config = mkconfig.create_json(args.m, args.p, args.n, params_overrides)
    # There must not be any newlines in the config json string
    if "\n" in config:
        print("Error: config.json must not contain embedded newlines")
        sys.exit(1)
    # Now add a trailing newline
    config += "\n"

    nodelist = args.n
    if nodelist is None or len(nodelist) == 0:
        nodelist = manifest.keys()

    threadlist = []
    for node in nodelist:
        if node == "params":
            continue
        thread = threading.Thread(target=launch,
            args=(node, manifest, config, args.cmd, args.l, args.d, args.e, args.w))
        thread.start()
        threadlist.append(thread)

    for thread in threadlist:
        thread.join()