import logging
from json import dumps
from operator import itemgetter
from typing import OrderedDict

import requests
from django.conf import settings
from requests.exceptions import JSONDecodeError

logger = logging.getLogger(__name__)


def escape(obj):
    chars = ["[", "]", "^", "-", "*", "?"]
    if isinstance(obj, str):
        obj = obj.replace("\\", "\\\\")
        for i in chars:
            obj = obj.replace(i, "\\" + i)
    elif isinstance(obj, list):
        for i in obj:
            i = escape(i)
    elif isinstance(obj, dict):
        for key in obj:
            obj[key] = escape(obj[key])
    return obj


def sort_data(data):
    for item in data.keys():
        if isinstance(data[item], list):
            cont = False
            for v in data[item]:
                if isinstance(v, list):
                    cont = True
                if isinstance(v, dict):
                    cont = True
            if cont:
                continue
            data[item].sort()
        elif isinstance(data[item], dict):
            # Don't sort nested stuff
            cont = False
            for k, v in data[item].items():
                if isinstance(v, list):
                    cont = True
                if isinstance(v, dict):
                    cont = True
            if cont:
                continue
            sorted_item = sorted(data[item].items(), key=itemgetter(1), reverse=True)
            data[item] = OrderedDict({k: v for k, v in sorted_item})


def threshold_request(url, data, method="POST", esc=False):
    headers = {
        "ApiKey": settings.THRESHOLD_API_KEY,
        "Token": settings.THRESHOLD_API_TOKEN,
    }
    if esc:
        for key in data:
            data[key] = escape(data[key])

    if method == "POST":
        method = requests.post
    elif method == "GET":
        method = requests.get
    elif method == "DELETE":
        method = requests.delete
    elif method == "PUT":
        method = requests.put
    else:
        logger.error("Invalid method specified")
        method = requests.get

    r = method(
        f"{settings.THRESHOLD_ENDPOINT}/{url}/", data=dumps(data), headers=headers
    )
    if not r.headers.get("Counter") == settings.THRESHOLD_API_COUNTER:
        logger.error(
            (
                f"Threshold API counter mismatch: "
                f"{r.headers.get('Counter')} != "
                f"{settings.THRESHOLD_API_COUNTER}"
            )
        )
        return False
    try:
        response = r.json()
        sort_data(response)
    except JSONDecodeError:
        logging.error(f"Invalid JSON response: {r.text}")
        return False
    return response


def get_chans(net, query):
    url = "chans"
    payload = {"net": net, "query": query}
    channels = threshold_request(url, payload, esc=True)
    if not channels:
        return []
    return channels["chans"]


def get_users(net, query):
    url = "users"
    payload = {"net": net, "query": query}
    users = threshold_request(url, payload, esc=True)
    if not users:
        return []
    return users["users"]


def annotate_online(net, query):
    url = "online"
    payload = {"net": net, "query": query}
    online_info = threshold_request(url, payload, esc=True)
    if not online_info:
        return {}
    return online_info


def annotate_num_users(net, query):
    url = "num_users"
    payload = {"net": net, "query": query}
    user_num_map = threshold_request(url, payload, esc=True)
    if not user_num_map:
        return {}
    return user_num_map


def annotate_num_chans(net, query):
    url = "num_chans"
    payload = {"net": net, "query": query}
    chan_num_map = threshold_request(url, payload, esc=True)
    if not chan_num_map:
        return {}
    return chan_num_map