#!/usr/bin/python3.6

# SPDX Licence identifier MIT
# Copyright (c) 2017-2018 Red Hat Inc.
# Author: Stef Walter <stefw@redhat.com>
#         Andrei Stepanov <astepano@redhat.com>
#         Bruno Goncalves <bgoncalv@redhat.com>


import os
import sys
import json
import errno
import logging
import argparse
import distutils.util


EMPTY_INVENTORY = {}
LOG_FILE = "default_provisioners.log"


def print_bad_inventory():
    """Print bad inventory on any uncatched exception. This will prevent
    running playbook on localhost.
    """
    fake_host = "fake_host"
    fake_hostname = "standard-inventory-qcow2_failed_check_logs"
    hosts = [fake_host]
    bad_inv = {"localhost": {"hosts": hosts, "vars": {}},
               "subjects": {"hosts": hosts, "vars": {}},
               "_meta": {"hostvars": {fake_host: {"ansible_host": fake_hostname}}}}
    sys.stdout.write(json.dumps(bad_inv, indent=4, separators=(',', ': ')))


def get_artifact_path(path=""):
    """Return path to an artifact file in artifacts directory. If path == ""
    than return path artifacts dir.  Create artifacts dir if necessary.
    """
    artifacts = os.environ.get("TEST_ARTIFACTS", os.path.join(os.getcwd(), "artifacts"))
    try:
        os.makedirs(artifacts)
    except OSError as exc:
        if exc.errno != errno.EEXIST or not os.path.isdir(artifacts):
            raise
    return os.path.join(artifacts, path)


def inv_list():
    hosts = []
    variables = {}
    if os.environ.get("TEST_SUBJECTS", None) == "local":
        host_vars = inv_host("local")
        if host_vars:
            hosts.append("local")
            variables["local"] = host_vars
    if not hosts:
        return EMPTY_INVENTORY
    return {"subjects": {"hosts": hosts, "vars": {}},
            "localhost": {"hosts": hosts, "vars": {}},
            "_meta": {"hostvars": variables}}


def inv_host(host):
    if host == "local":
        return {"ansible_connection": "local"}
    return EMPTY_INVENTORY


def main(argv):
    global logger
    global diagnose
    logger = logging.getLogger(__name__)
    logger.setLevel(logging.DEBUG)
    # stderr output
    conhandler = logging.StreamHandler()
    # Print to strerr by default messages with level >= warning, can be changed
    # with setting TEST_DEBUG=1.
    try:
        diagnose = distutils.util.strtobool(os.getenv("TEST_DEBUG", "0"))
    except ValueError:
        diagnose = 0
    conhandler.setLevel(logging.WARNING)
    if diagnose:
        # Collect all messages with any log level to stderr.
        conhandler.setLevel(logging.NOTSET)
    # Log format for stderr.
    log_format = "[%(levelname)-5.5s] {}: %(message)s".format(os.path.basename(__file__))
    formatter = logging.Formatter(log_format)
    conhandler.setFormatter(formatter)
    logger.addHandler(conhandler)
    parser = argparse.ArgumentParser(description="Inventory for local")
    parser.add_argument("--list", action="store_true", help="Verbose output")
    parser.add_argument('--host', help="Get host variables")
    opts = parser.parse_args()
    # Send logs to common logfile for all default provisioners.
    log_file = get_artifact_path(LOG_FILE)
    fhandler = logging.FileHandler(log_file)
    # Collect all messages with any log level to log file.
    fhandler.setLevel(logging.NOTSET)
    log_format = ("%(asctime)s [{}/%(threadName)-12.12s] [%(levelname)-5.5s]:"
                  "%(message)s").format(os.path.basename(__file__))
    logFormatter = logging.Formatter(log_format)
    fhandler.setFormatter(logFormatter)
    logger.addHandler(fhandler)
    logger.info("Start provisioner.")
    if opts.host:
        data = inv_host(opts.host)
    else:
        data = inv_list()
    sys.stdout.write(json.dumps(data, indent=4, separators=(',', ': ')))


if __name__ == '__main__':
    ret = -1
    try:
        main(sys.argv)
        ret = 0
    except Exception:
        print_bad_inventory()
        # Backtrace stack goes to log file. If TEST_DEBUG == 1, it goes to stderr too.
        logger.info("Fatal error in provision script.", exc_info=True)
    sys.exit(ret)
