#!/usr/bin/env/python3
##############################################################################
# Copyright (c) 2015 Todd Gaunt and others.
#
# All rights reserved. This program and the accompanying materials
# are made available under the terms of the Apache License, Version 2.0
# which accompanies this distribution, and is available at
# http://www.apache.org/licenses/LICENSE-2.0
##############################################################################

import yaml
import threading
import queue
import argparse
import logging
import os
import sys

from pharosvalidator import receiver
from pharosvalidator import util 
from pharosvalidator import dhcp
from pharosvalidator import ipmi
from pharosvalidator import config
from pharosvalidator import server

def main():
    """PXE boot each nodes, then start up server to receive results"""
    # The logger instance for this function
    logger = logging.getLogger("pharosvalidator")
    args = parse_args()

    # Determine the logging level
    loglevel = logging.INFO
    if args["verbose"]:
        loglevel = logging.DEBUG
    if args["quiet"]:
        loglevel = logging.CRITICAL

    configure_root_logger(loglevel, args["logfile"])

    # Create a new logger strictly for logging test results to a file
    test_logger = logging.getLogger('test_logger')
    test_logger.setLevel(logging.INFO)
    tl_handler = logging.FileHandler(args["test_log"])
    tl_handler.setFormatter(logging.Formatter("%(message)s"))
    test_logger.addHandler(tl_handler)

    # Open up the inventory file
    invconf = config.Inventory(args["inventoryfile"])

    # Open up the network configuration fil
    netconf = config.Topology(args["networkfile"])

    # Assign yourself an ip
    #bring_up_admin_ip(netconf.networks["admin"].installer_ip)

    # Start dhcp server
    dhcp.gen_dhcpd_file(args["dhcpdfile"], invconf.nodes, netconf.networks["admin"])
    if dhcp.start_server() != 0:
        logger.error("Halting, cannot bring up dhcp server")
        quit()


    # Queue for holding test logs, makes program thread safe
    logs_q = queue.Queue()

    # Start a new thread for the server that receives results
    threading.Thread(target=receiver.start, \
            args=(invconf.nodecount(), args["server-port"], logs_q), \
            daemon=True).start()

    failed_nodes = ipmi.power_nodes(invconf.nodes, "on")

    # If the failed nodes list is not empty, then fail
    if failed_nodes != []:
        logger.error("Halting, {} were unable to be powered on".format(", ".join(failed_nodes)))
        quit()

    admin_network = netconf.networks["admin"]

    ip_range = util.gen_ip_range(admin_network.cidr, [admin_network.installer_ip], admin_network.usable_ip_range.minimum, \
            admin_network.usable_ip_range.maximum)

    logger.info(ip_range)

    available_ips = server.ping_network(ip_range_list=ip_range, ipcnt=len(invconf.nodes), passes=20)

    logger.info(available_ips)

    # Start a thread to run tests on each different node, and setup
    # their NICs
    for ip in available_ips:
        threading.Thread( \
                target=server.ssh_thread, \
                args=(str(ip), str(admin_network.installer_ip), str(args["port"]), 200), \
                daemon=True).start()

    while True: 
        logger.info("Awaiting test result...")
        test_logger.info(logs_q.get())
        logger.info("Logging test result...")
        if logs_q.empty():
            break

    logger.info("Finished test, check {} and {}".format(args["logfile"], args["test_log"]))


def configure_root_logger(loglevel, logfile):
    # Add a file handler to the default logger
    formatter = logging.Formatter("%(asctime)s - %(name)s - %(levelname)s - %(message)s")

    # Configure the root logger
    stdout_handler = logging.StreamHandler(sys.stdout)
    stdout_handler.setLevel(loglevel)
    stdout_handler.setFormatter(formatter)
    rl_handler = logging.FileHandler(logfile)
    rl_handler.setFormatter(formatter)

    root_logger = logging.getLogger()
    root_logger.addHandler(rl_handler)
    root_logger.addHandler(stdout_handler)
    root_logger.setLevel(loglevel)

def parse_args():
    """
    parse_args: parse the commandline arguments and configuration file into
    a dictionary that can be easily passed and referenced by other functions

    input: None

    output: Dictionary of all commandline arguments and configuration file
    settings
    """
    logger = logging.getLogger(__name__)

    parser = argparse.ArgumentParser( \
            description='evaluates a system against the pharos specification')

    parser.add_argument('--version',
                        action="store_true", default=False,
                        help='display version then exit')

    parser.add_argument('-q', '--quiet',
                        action="store_true", default=False,
                        help='disable console output')

    parser.add_argument('-v', '--verbose',
                        action="store_true", default=False,
                        help='Enable debugging level output')

    parser.add_argument('-o', '--output',
                        type=str, default="yaml",
                        help='Define which machine readable format to output')

    # port that the client should connect to
    parser.add_argument('-c', '--config',
                        type=str, default="/etc/pharosvalidator/config.yaml",
                        help='Configuration file to read')

    # port that the server should use
    parser.add_argument('-p', '--port',
                        type=str, default=12121,
                        help='flag to determine if server or client behavior \
                                should be used')

    args = vars(parser.parse_args())

    # Read the configuration file first to get extra information
    if os.path.isfile(args["config"]):
        with open(args["config"], 'r') as fd:
            conf = yaml.load(fd.read())
    else:
        logger.error("Halting, unable to load configuration file")
        quit(1)

    for field in args:
        conf[field] = args[field]
    args = conf

    return args

if __name__ == "__main__":
    main()