import random
from urllib.parse import quote as url_escape

import requests
from django.core.handlers.wsgi import WSGIRequest
from django.http import HttpResponse
from django.template import loader

from tmessage.models import tMUser
from tmessage.settings import config

COLORS = ["rosewater", "flamingo", "pink", "mauve", "red", "maroon", "peach", "yellow", "green", "teal", "sky", "sapphire", "blue", "lavender"]

def render_template(
    request: WSGIRequest,
    template: str,
    /, *,
    status: int=200,
    headers: dict[str, str]={},
    content_type: str="text/html",
    **context
) -> HttpResponse:
    c = {
        "accent": random.choice(COLORS),
        "config": config,
        "login_token": f"/auth/?sessionid={request.COOKIES.get('sessionid')}"
    }

    for key, val in context.items():
        c[key] = val

    resp = HttpResponse(
        loader.get_template(template).render(c, request),
        status=status,
        content_type=content_type
    )

    for key, val in headers.items():
        resp[key] = val

    return resp

def get_username(request: WSGIRequest) -> str | None:
    resp = requests.get(config["services"]["auth"]["url"]["int"] + f"/api/authenticated/?token={url_escape(config['services']['message']['token'])}&service=message", cookies={**request.COOKIES}).json()

    if not resp["success"]:
        raise Exception("Unable to communicate with tAuth")

    return resp["username"]

def username_exists(username: str) -> bool:
    resp = requests.get(config["services"]["auth"]["url"]["int"] + f"/api/username/?token={url_escape(config['services']['message']['token'])}&service=message&username={url_escape(username)}").json()

    if not resp["success"]:
        raise Exception("Unable to communicate with tAuth")

    return resp["exists"]

def get_user_object(username: str, *, i_promise_this_user_exists: bool=False) -> tMUser:
    if i_promise_this_user_exists or username_exists(username):
        try:
            return tMUser.objects.get(username=username)
        except tMUser.DoesNotExist:
            return tMUser.objects.create(username=username)

    else:
        raise tMUser.DoesNotExist(f"tAuth doesn't know who {username} is")