#!/usr/bin/env python3

# Daemon.py - PVC HTTP API daemon
# Part of the Parallel Virtual Cluster (PVC) system
#
#    Copyright (C) 2018-2022 Joshua M. Boniface <joshua@boniface.me>
#
#    This program is free software: you can redistribute it and/or modify
#    it under the terms of the GNU General Public License as published by
#    the Free Software Foundation, version 3.
#
#    This program is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#    GNU General Public License for more details.
#
#    You should have received a copy of the GNU General Public License
#    along with this program.  If not, see <https://www.gnu.org/licenses/>.
#
###############################################################################

import os
import yaml

from ssl import SSLContext, TLSVersion

from distutils.util import strtobool as dustrtobool

# Daemon version
version = "0.9.74"

# API version
API_VERSION = 1.0


##########################################################
# Helper Functions
##########################################################


def strtobool(stringv):
    if stringv is None:
        return False
    if isinstance(stringv, bool):
        return bool(stringv)
    try:
        return bool(dustrtobool(stringv))
    except Exception:
        return False


##########################################################
# Configuration Parsing
##########################################################

# Parse the configuration file
try:
    pvcapid_config_file = os.environ["PVC_CONFIG_FILE"]
except Exception:
    print(
        'Error: The "PVC_CONFIG_FILE" environment variable must be set before starting pvcapid.'
    )
    exit(1)

print('Loading configuration from file "{}"'.format(pvcapid_config_file))

# Read in the config
try:
    with open(pvcapid_config_file, "r") as cfgfile:
        o_config = yaml.load(cfgfile, Loader=yaml.BaseLoader)
except Exception as e:
    print("ERROR: Failed to parse configuration file: {}".format(e))
    exit(1)

try:
    # Create the config object
    config = {
        "debug": strtobool(o_config["pvc"]["debug"]),
        "coordinators": o_config["pvc"]["coordinators"],
        "listen_address": o_config["pvc"]["api"]["listen_address"],
        "listen_port": int(o_config["pvc"]["api"]["listen_port"]),
        "auth_enabled": strtobool(o_config["pvc"]["api"]["authentication"]["enabled"]),
        "auth_secret_key": o_config["pvc"]["api"]["authentication"]["secret_key"],
        "auth_tokens": o_config["pvc"]["api"]["authentication"]["tokens"],
        "ssl_enabled": strtobool(o_config["pvc"]["api"]["ssl"]["enabled"]),
        "ssl_key_file": o_config["pvc"]["api"]["ssl"]["key_file"],
        "ssl_cert_file": o_config["pvc"]["api"]["ssl"]["cert_file"],
        "database_host": o_config["pvc"]["provisioner"]["database"]["host"],
        "database_port": int(o_config["pvc"]["provisioner"]["database"]["port"]),
        "database_name": o_config["pvc"]["provisioner"]["database"]["name"],
        "database_user": o_config["pvc"]["provisioner"]["database"]["user"],
        "database_password": o_config["pvc"]["provisioner"]["database"]["pass"],
        "queue_host": o_config["pvc"]["provisioner"]["queue"]["host"],
        "queue_port": o_config["pvc"]["provisioner"]["queue"]["port"],
        "queue_path": o_config["pvc"]["provisioner"]["queue"]["path"],
        "storage_hosts": o_config["pvc"]["provisioner"]["ceph_cluster"][
            "storage_hosts"
        ],
        "storage_domain": o_config["pvc"]["provisioner"]["ceph_cluster"][
            "storage_domain"
        ],
        "ceph_monitor_port": o_config["pvc"]["provisioner"]["ceph_cluster"][
            "ceph_monitor_port"
        ],
        "ceph_storage_secret_uuid": o_config["pvc"]["provisioner"]["ceph_cluster"][
            "ceph_storage_secret_uuid"
        ],
    }

    # Use coordinators as storage hosts if not explicitly specified
    if not config["storage_hosts"]:
        config["storage_hosts"] = config["coordinators"]

except Exception as e:
    print("ERROR: Failed to load configuration: {}".format(e))
    exit(1)


##########################################################
# Entrypoint
##########################################################


def entrypoint():
    import pvcapid.flaskapi as pvc_api  # noqa: E402

    if config["ssl_enabled"]:
        context = SSLContext()
        context.minimum_version = TLSVersion.TLSv1
        context.get_ca_certs()
        context.load_cert_chain(config["ssl_cert_file"], keyfile=config["ssl_key_file"])
    else:
        context = None

    # Print our startup messages
    print("")
    print("|----------------------------------------------------------|")
    print("|                                                          |")
    print("|           ███████████ ▜█▙      ▟█▛ █████ █ █ █           |")
    print("|                    ██  ▜█▙    ▟█▛  ██                    |")
    print("|           ███████████   ▜█▙  ▟█▛   ██                    |")
    print("|           ██             ▜█▙▟█▛    ███████████           |")
    print("|                                                          |")
    print("|----------------------------------------------------------|")
    print("| Parallel Virtual Cluster API daemon v{0: <19} |".format(version))
    print("| Debug: {0: <49} |".format(str(config["debug"])))
    print("| API version: v{0: <42} |".format(API_VERSION))
    print(
        "| Listen: {0: <48} |".format(
            "{}:{}".format(config["listen_address"], config["listen_port"])
        )
    )
    print("| SSL: {0: <51} |".format(str(config["ssl_enabled"])))
    print("| Authentication: {0: <40} |".format(str(config["auth_enabled"])))
    print("|----------------------------------------------------------|")
    print("")

    pvc_api.app.run(
        config["listen_address"],
        config["listen_port"],
        threaded=True,
        ssl_context=context,
    )