import re
from datetime import datetime

from django.contrib.auth import authenticate
from django.contrib.auth.models import User
from django.core.handlers.wsgi import WSGIRequest
from django.http import HttpResponse, HttpResponseRedirect

from tauth.models import tUser
from tauth.sessions import (clear_session, create_session, get_user,
                            is_authenticated)
from tauth.settings import config

from .helper import render_template


def auth(request: WSGIRequest) -> HttpResponseRedirect:
    resp = HttpResponseRedirect("/")
    if "remove" in request.GET:
        resp.set_cookie("session_id", "", max_age=0, expires=datetime(0, 0, 0))
    else:
        resp.set_cookie("session_id", request.GET.get("sessionid") or "")

    return resp

def index(request: WSGIRequest) -> HttpResponse:
    u = get_user(request)
    if u:
        return render_template(
            request, "index.html",
            username=u.username
        )

    return render_template(
        request, "noauth/index.html"
    )

def signup(request: WSGIRequest) -> HttpResponse:
    if is_authenticated(request):
        return HttpResponseRedirect("/")

    if config["new_users"]:
        if request.method == "POST":
            username = (request.POST.get("username") or "").lower().strip()
            password = (request.POST.get("password") or "")
            error = None

            if len(username) < 2 or len(username) > 30 or not re.match("^[a-z0-9_][a-z0-9_\\-]{0,28}[a-z0-9_]$", username):
                error = "Invalid username"

            elif len(password) < 6 or len(password) > 100 or not (any([i.isalpha() for i in password]) and any([i.isnumeric() for i in password]) and any([not i.isalnum() for i in password])):
                error = "Invalid password"

            elif username.lower() in password.lower():
                error = "Password can't contain username"

            else:
                try:
                    u = User.objects.create_user(
                        username=username,
                        password=password
                    )
                except User.DoesNotExist:
                    error = "Username already in use"
                else:
                    tUser.objects.create(user=u)
                    to = request.GET.get("to")

                    if to and to in config["services"] and config["services"][to]:
                        resp = HttpResponseRedirect(f"/redirect/?to={to}&reauth")
                    else:
                        resp = HttpResponseRedirect("/")

                    create_session(request, resp, u)
                    return resp

            return render_template(
                request, "noauth/signup.html",
                title="Sign Up",
                error=error,
                login_extra=f"?to={request.GET.get('to')}" if "to" in request.GET else "",
                repopulate={
                    "username": username
                }
            )

        return render_template(
            request, "noauth/signup.html",
            title="Sign Up",
            login_extra=f"?to={request.GET.get('to')}" if "to" in request.GET else ""
        )

    return render_template(
        request, "404.html"
    )

def login(request: WSGIRequest) -> HttpResponse:
    if is_authenticated(request):
        to = request.GET.get("to")

        if to and to in config["services"] and config["services"][to]:
            return HttpResponseRedirect(f"/redirect/?to={to}&reauth")

        return HttpResponseRedirect("/")

    if request.method == "POST":
        username = (request.POST.get("username") or "").lower().strip()
        password = (request.POST.get("password") or "")

        user = authenticate(
            request,
            username=username,
            password=password
        )

        if user is None:
            return render_template(
                request, "noauth/login.html",
                title="Log In",
                new_users=config["new_users"],
                error="Username or password is incorrect",
                login_extra=f"?to={request.GET.get('to')}" if "to" in request.GET else "",
                repopulate={
                    "username": username
                }
            )

        to = request.GET.get("to")

        if to and to in config["services"] and config["services"][to]:
            resp = HttpResponseRedirect(f"/redirect/?to={to}&reauth")
        else:
            resp = HttpResponseRedirect("/")

        create_session(request, resp, user)
        return resp


    return render_template(
        request, "noauth/login.html",
        title="Log In",
        new_users=config["new_users"],
        login_extra=f"?to={request.GET.get('to')}" if "to" in request.GET else ""
    )

def redirect(request: WSGIRequest) -> HttpResponseRedirect:
    to = request.GET.get("to")

    if to and to in config["services"] and config["services"][to]:
        return HttpResponseRedirect(config["services"][to]["url"]["pub"] + (f"/auth/?sessionid={request.COOKIES.get('session_id')}" if "reauth" in request.GET else ""))

    return HttpResponseRedirect("/")

def logout(request: WSGIRequest) -> HttpResponseRedirect:
    clear_session(request)
    to = request.GET.get("to")

    if to and to in config["services"] and config["services"][to]:
        return HttpResponseRedirect(config["services"][to]["url"]["pub"] + "/auth/?remove")

    return HttpResponseRedirect("/")