#!/usr/bin/env python

import argparse
import logging
import re
import shlex
import subprocess
import sys
import yaml

console = logging.StreamHandler()
formatter = logging.Formatter('%(message)s')
console.setFormatter(formatter)
logger = logging.getLogger()
logger.setLevel(logging.DEBUG)
logger.addHandler(console)


def system_command(command, expected_resultcodes=(0,)):
    commands = [i.strip() for i in re.split(ur'\|', command)]

    process = []
    process.append(subprocess.Popen(shlex.split(commands[0]),
                                    stdin=None,
                                    stdout=subprocess.PIPE,
                                    stderr=subprocess.PIPE))

    for c in commands[1:]:
        process[-1].wait()
        process.append(subprocess.Popen(shlex.split(c),
                                        stdin=process[-1].stdout,
                                        stdout=subprocess.PIPE,
                                        stderr=subprocess.PIPE))

    process[-1].wait()

    serr = []
    for p in process:
        serr += [err.strip() for err in p.stderr.readlines()]

    returncode = process[-1].returncode

    if expected_resultcodes and returncode not in expected_resultcodes:
        logger.error(
            "Command: '%s'\nreturned not expected value: %d\n"
            "stdout:\n%s\nstderr:\n%s",
            (command, returncode, process[-1].stdout.read().rstrip('\n'),
             '\n'.join(serr).rstrip('\n')))
        sys.exit(1)
    else:
        logger.debug("Command '%s' returned %d" % (command, returncode))

    return returncode


def is_system_exist(system_name):
    command = """/usr/bin/cobbler system find \
--name=%s | grep \"^%s$\" """ % (system_name, system_name)

    logger.debug("Running command: %s" % command)
    code = system_command(command, expected_resultcodes=(0, 1))
    return code == 0


def update_system(system_name, system_dict):
    addedit = 'add'
    if is_system_exist(system_name):
        addedit = 'edit'

    command = ["/usr/bin/cobbler system %s --name='%s' --hostname='%s'" %
               (addedit, system_name, system_dict['hostname'])]

    ksmeta = system_dict.get('ksmeta', '')
    for opt in system_dict:
        if opt in ('interfaces', 'ksmeta', 'interfaces_extra'):
            continue

        command.append("""--%s='%s'""" % (opt, system_dict[opt]))

    for int_name in system_dict.get('interfaces_extra', {}):
        int_extra_dict = system_dict['interfaces_extra'][int_name]
        for int_extra in int_extra_dict:
            ksmeta = """%s interface_extra_%s_%s=%s""" % \
                (ksmeta, int_name, int_extra, int_extra_dict[int_extra])

    command.append("""--ksmeta='%s'""" % ksmeta)
    command = " ".join(command)

    logger.info("Running command: %s" % command)
    return system_command(command) == 0


def update_system_interfaces(system_name, interfaces_dict):
    addedit = 'add'
    if is_system_exist(system_name):
        addedit = 'edit'

    code = set([0])
    for interface_name in interfaces_dict:
        logger.info("=== Defining interface ===: %s" % interface_name)
        int_opts = interfaces_dict[interface_name]

        command = ["""/usr/bin/cobbler system %s --name='%s' \
--interface='%s'""" % (addedit, system_name, interface_name)]

        for opt in int_opts:
            logger.debug("Interface option: %s = %s" % (opt, int_opts[opt]))
            command.append("""--%s='%s'""" % (opt, int_opts[opt]))

        command = " ".join(command)

        logger.info("Running command: %s" % command)
        code.union(set([system_command(command)]))

    return len(code) == 0


def main():
    parser = argparse.ArgumentParser()
    parser.add_argument("-f", "--file", dest="file",
                        metavar="YAML_FILE", type=str,
                        help="nodes yaml file")
    parser.add_argument("-l", "--level", dest="log_level", type=str,
                        help="log level, one of DEBUG, INFO, WARNING, ERROR",
                        choices=["DEBUG", "INFO", "WARNING", "ERROR"],
                        default="INFO", metavar="LEVEL")

    params = parser.parse_args()

    numeric_level = getattr(logging, params.log_level.upper())
    logger.setLevel(numeric_level)

    if params.file is None:
        parser.error("Yaml file must be defined with -f option.")

    with open(params.file, 'r') as file:
        nodes = yaml.load(file.read())

    for name in nodes:
        logger.info("====== Defining node ======: %s" % name)
        update_system(name, nodes[name])
        update_system_interfaces(name, nodes[name]['interfaces'])

if __name__ == "__main__":
    main()