#!/usr/bin/env python3

import argparse
import json
import sys
import urllib.parse
from collections.abc import Sequence
from typing import Union

import argcomplete
import requests
from argcomplete.completers import subprocess
from requests.models import HTTPBasicAuth

base_url = "https://knotapitest.sunet.se"
user = "kano"
password = subprocess.getoutput("pass show knotapitest.sunet.se/{}".format(user))

# Authenticate
basic = HTTPBasicAuth(user, password)
response = requests.get(base_url + "/user/login", auth=basic)
token = response.json()["token"]
headers = {"Authorization": "Bearer {}".format(token)}

# Parse out information for each command line option
parser = argparse.ArgumentParser()
parser.add_argument("--json", action=argparse.BooleanOptionalAction)
subparsers = parser.add_subparsers(dest="command")
add = subparsers.add_parser("add")
add.add_argument(
    "-d",
    "--data",
    nargs="*",
    help="Specify any number of key - value pairs: name=dns1.example.com.",
)
add.add_argument("--name")
add.add_argument("--rtype")
add.add_argument("--zone", required=True)

delete = subparsers.add_parser("delete")
delete.add_argument(
    "--data",
    nargs="*",
    help="Specify any number of key - value pairs: name=dns1.example.com.",
)
delete.add_argument("--name")
delete.add_argument("--rtype")
delete.add_argument("--zone", required=True)

listcmd = subparsers.add_parser("list")
listcmd.add_argument(
    "--data",
    nargs="*",
    help="Specify any number of key - value pairs: name=dns1.example.com.",
)
listcmd.add_argument("--name")
listcmd.add_argument("--rtype")
listcmd.add_argument("--zone")

update = subparsers.add_parser("update")
update.add_argument(
    "--data",
    nargs="*",
    help="Specify any number of key - value pairs: name=dns1.example.com.",
    required=True,
)
update.add_argument("--name", required=True)
update.add_argument("--rtype", required=True)
update.add_argument("--zone", required=True)

argcomplete.autocomplete(parser)
args = parser.parse_args()


def error(description: str, error: str) -> Sequence[dict]:
    response = []
    reply = {}
    # https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/406
    reply["Code"] = 406
    reply["Description"] = description
    reply["Error"] = error
    response.append(reply)
    return response


def output(response: Sequence[dict], jsonout: bool = False):
    try:
        if jsonout:
            print(json.dumps(response))
        else:
            for entry in response:
                print(nested_out(entry))
    except BrokenPipeError:
        pass


def nested_out(input, tabs="") -> str:
    string = ""
    if isinstance(input, str):
        string += "{}\n".format(input)
    elif isinstance(input, dict):
        for key, value in input.items():
            string += "{}{}: {}".format(tabs, key, nested_out(value, tabs + " "))
    elif isinstance(input, list):
        for entry in input:
            string += "{}\n{}".format(tabs, nested_out(entry, tabs + " "))
    return string


# Define the parser for each command
def run_add(url: str, jsonout: bool):
    response = requests.put(url, headers=headers)
    output(response.json(), jsonout)


def run_delete(url: str, jsonout: bool):
    response = requests.delete(url, headers=headers)
    output(response.json(), jsonout)


def run_list(url: str, jsonout: bool):
    response = requests.get(url, headers=headers)
    output(response.json(), jsonout)


def run_update(url: str, jsonout: bool):
    response = requests.patch(url, headers=headers)
    output(response.json(), jsonout)


# Set up the url
def setup_url(
    data: Union[None, Sequence[str]],
    name: Union[None, str],
    rtype: Union[None, str],
    zone: Union[None, str],
) -> str:
    url = base_url + "/zones"
    if zone:
        url += "/{}".format(zone)
    if name and zone:
        url += "/records/{}".format(name)
    if zone and name and rtype:
        url += "/{}".format(rtype)
    if data and zone and name and rtype:
        url += "?"
        for arg in data:
            if not url.endswith("?"):
                url += "&"
            url += urllib.parse.quote_plus(arg)
    if rtype and (not name or not zone):
        output(error("rtype only makes sense with name and zone", "Missing parameter"))
        sys.exit(1)
    if name and not zone:
        output(error("name only makes sense with a zone", "Missing parameter"))
        sys.exit(1)
    return url


# Route based on command
url = setup_url(args.data, args.name, args.rtype, args.zone)
if args.command == "add":
    run_add(url, args.json)
elif args.command == "delete":
    run_delete(url, args.json)
elif args.command == "list":
    run_list(url, args.json)
elif args.command == "update":
    run_update(url, args.json)