import hashlib
from simplejson.decoder import JSONDecodeError
from utils import json_functions as json
from django.contrib.auth.models import User
from django.core.cache import cache
from django.utils.http import urlquote
from django.http import HttpResponseForbidden
from django.http import HttpResponse
from django.conf import settings


def ajax_login_required(function=None):
    def _dec(view_func):
        def _view(request, *args, **kwargs):
            if request.user.is_anonymous:
                return HttpResponseForbidden()
            else:
                return view_func(request, *args, **kwargs)

        _view.__name__ = view_func.__name__
        _view.__dict__ = view_func.__dict__
        _view.__doc__ = view_func.__doc__

        return _view

    if function is None:
        return _dec
    else:
        return _dec(function)


def oauth_login_required(function=None):
    def _dec(view_func):
        def _view(request, *args, **kwargs):
            if request.user.is_anonymous:
                return HttpResponse(
                    content=json.encode(
                        {
                            "message": "You must have a valid OAuth token.",
                        }
                    ),
                    status=401,
                )
            else:
                try:
                    setattr(request, "body_json", json.decode(request.body))
                except JSONDecodeError:
                    return HttpResponse(
                        content=json.encode(
                            {
                                "message": "Your JSON body is malformed.",
                            }
                        ),
                        status=400,
                    )
                return view_func(request, *args, **kwargs)

        _view.__name__ = view_func.__name__
        _view.__dict__ = view_func.__dict__
        _view.__doc__ = view_func.__doc__

        return _view

    if function is None:
        return _dec
    else:
        return _dec(function)


def admin_only(function=None):
    def _dec(view_func):
        def _view(request, *args, **kwargs):
            if not request.user.is_staff:
                return HttpResponseForbidden()
            else:
                return view_func(request, *args, **kwargs)

        _view.__name__ = view_func.__name__
        _view.__dict__ = view_func.__dict__
        _view.__doc__ = view_func.__doc__

        return _view

    if function is None:
        return _dec
    else:
        return _dec(function)


def get_user(request):
    if not hasattr(request, "user"):
        user = request
    else:
        user = request.user

    if user.is_anonymous and hasattr(request, "POST"):
        # Check secret_token parameter
        secret_token = request.POST.get("secret_token", None) or request.GET.get("secret_token", None)
        if secret_token:
            try:
                user = User.objects.get(profile__secret_token=secret_token)
                request.user = user
            except User.DoesNotExist:
                pass

    if user.is_anonymous:
        try:
            user = User.objects.get(username=settings.HOMEPAGE_USERNAME)
        except User.DoesNotExist:
            user = User.objects.create(username=settings.HOMEPAGE_USERNAME)
            user.set_password("")
            user.save()
    return user


def invalidate_template_cache(fragment_name, *variables):
    args = hashlib.md5((":".join([urlquote(var) for var in variables]).encode("utf-8")))
    cache_key = "template.cache.%s.%s" % (fragment_name, args.hexdigest())
    cache.delete(cache_key)


def generate_secret_token(phrase, size=12):
    """Generate a (SHA1) security hash from the provided info."""
    info = f"{phrase} {settings.SECRET_KEY}".encode("utf-8")
    return hashlib.sha256(info).hexdigest()[:size]


def extract_user_agent(request):
    user_agent = request.environ.get("HTTP_USER_AGENT", "").lower()
    platform = "------"
    if "ipad app" in user_agent:
        platform = "iPad"
    elif "iphone app" in user_agent:
        platform = "iPhone"
    elif "blar" in user_agent:
        platform = "Blar"
    elif "Android app" in user_agent:
        platform = "Androd"
    elif "android" in user_agent:
        platform = "androd"
    elif "pluggio" in user_agent:
        platform = "Plugio"
    elif "msie" in user_agent:
        platform = "IE"
        if "msie 9" in user_agent:
            platform += "9"
        elif "msie 10" in user_agent:
            platform += "10"
        elif "msie 8" in user_agent:
            platform += "8"
    elif "trident/7" in user_agent:
        platform = "IE11"
    elif "chrome" in user_agent:
        platform = "Chrome"
    elif "safari" in user_agent:
        platform = "Safari"
    elif "meego" in user_agent:
        platform = "MeeGo"
    elif "firefox" in user_agent:
        platform = "FF"
    elif "opera" in user_agent:
        platform = "Opera"
    elif "wp7" in user_agent:
        platform = "WP7"
    elif "wp8" in user_agent:
        platform = "WP8"
    elif "tafiti" in user_agent:
        platform = "Tafiti"
    elif "readkit" in user_agent:
        platform = "ReadKt"
    elif "reeder" in user_agent:
        platform = "Reeder"
    elif "metroblur" in user_agent:
        platform = "Metrob"
    elif "feedme" in user_agent:
        platform = "FeedMe"
    elif "theoldreader" in user_agent:
        platform = "OldRdr"
    elif "fever" in user_agent:
        platform = "Fever"
    elif "superfeedr" in user_agent:
        platform = "Suprfd"
    elif "feed reader-window" in user_agent:
        platform = "FeedRe"
    elif "feed reader-background" in user_agent:
        platform = "FeReBg"

    return platform