"""Run PyNetgear from the command-line."""
import sys
import os

from argparse import ArgumentParser
from pynetgear import Netgear, BLOCK, ALLOW


def make_formatter(format_name):
    """Returns a callable that outputs the data. Defaults to print."""

    if "json" in format_name:
        from json import dumps
        import datetime

        def jsonhandler(obj):
            obj.isoformat() if isinstance(
                obj, (datetime.datetime, datetime.date)
            ) else obj

        if format_name == "prettyjson":

            def jsondumps(data):
                return dumps(
                    data, default=jsonhandler, indent=2, separators=(",", ": ")
                )

        else:

            def jsondumps(data):
                return dumps(data, default=jsonhandler)

        def jsonify(data):
            if isinstance(data, dict):
                print(jsondumps(data))
            elif isinstance(data, list):
                print(jsondumps([device._asdict() for device in data]))
            else:
                print(dumps({"result": data}))

        return jsonify
    else:

        def printer(data):
            if isinstance(data, dict):
                print(data)
            else:
                for row in data:
                    print(row)

        return printer


def argparser():
    """Constructs the ArgumentParser for the CLI"""

    parser = ArgumentParser(prog="pynetgear")

    parser.add_argument(
        "--format", choices=["json", "prettyjson", "py"], default="prettyjson"
    )

    router_args = parser.add_argument_group("router connection config")
    router_args.add_argument("--host", help="Hostname for the router")
    router_args.add_argument("--user", help="Account for login")
    router_args.add_argument("--port", help="Port exposed on the router")
    router_args.add_argument(
        "--login-v2",
        help="Force the use of the cookie-based authentication",
        dest="force_login_v2",
        default=False,
        action="store_true",
    )
    router_args.add_argument(
        "--password",
        help="Not required with a wired connection."
        + "Optionally, set the PYNETGEAR_PASSWORD environment variable",
    )
    router_args.add_argument(
        "--url", help="Overrides host:port and ssl with url to router"
    )
    router_args.add_argument(
        "--no-ssl",
        dest="ssl",
        default=True,
        action="store_false",
        help="Connect with https",
    )

    subparsers = parser.add_subparsers(
        description="Runs subcommand against the specified router",
        dest="subcommand",
    )

    block_parser = subparsers.add_parser(
        "block_device", help="Blocks a device from connecting by mac address"
    )
    block_parser.add_argument("--mac-addr")

    allow_parser = subparsers.add_parser(
        "allow_device", help="Allows a device with the mac address to connect"
    )
    allow_parser.add_argument("--mac-addr")

    subparsers.add_parser("login", help="Attempts to login to router.")

    attached_devices = subparsers.add_parser(
        "attached_devices", help="Outputs all attached devices"
    )
    attached_devices.add_argument(
        "-v",
        "--verbose",
        action="store_true",
        default=False,
        help="Choose between verbose and slower or terse and fast.",
    )

    subparsers.add_parser("traffic_meter", help="Output router's traffic meter data")

    return parser


def run_subcommand(netgear, args):
    """Runs the subcommand configured in args on the netgear session"""

    subcommand = args.subcommand

    if subcommand == "block_device" or subcommand == "allow_device":
        return netgear.allow_block_device(
            args.mac_addr, BLOCK if subcommand == "block_device" else ALLOW
        )

    if subcommand == "attached_devices":
        if args.verbose:
            return netgear.get_attached_devices_2()
        else:
            return netgear.get_attached_devices()

    if subcommand == "traffic_meter":
        return netgear.get_traffic_meter()

    if subcommand == "login":
        return netgear.login()

    print("Unknown subcommand")


def main():
    """Scan for devices and print results."""

    args = argparser().parse_args(sys.argv[1:])
    password = os.environ.get("PYNETGEAR_PASSWORD") or args.password

    netgear = Netgear(
        password,
        args.host,
        args.user,
        args.port,
        args.ssl,
        args.url,
        args.force_login_v2,
    )

    results = run_subcommand(netgear, args)
    formatter = make_formatter(args.format)

    if results is None:
        print("Error communicating with the Netgear router")

    else:
        formatter(results)


if __name__ == "__main__":
    main()