import datetime

from django.apps import apps
from django.shortcuts import get_object_or_404
from django.template.defaultfilters import title
from django.views import generic
from reversion import revisions as reversion

from versioning.versioning import RIGSVersion


class VersionHistory(generic.ListView):
    model = RIGSVersion
    template_name = "version_history.html"
    paginate_by = 25

    def get_queryset(self, **kwargs):
        return (
            RIGSVersion.objects.get_for_object(self.get_object())
            .select_related("revision", "revision__user")
            .all()
            .order_by("-revision__date_created")
        )

    def get_object(self, **kwargs):
        # Goddamit, almost got away without specific hacks
        if self.kwargs["model"].__name__ == "Asset":
            return get_object_or_404(self.kwargs["model"], asset_id=self.kwargs["pk"])
        else:
            return get_object_or_404(self.kwargs["model"], pk=self.kwargs["pk"])

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        context["object"] = self.get_object()
        if self.kwargs["app"] != "rigboard":
            context["override"] = f"base_{self.kwargs['app']}.html"

        return context


def get_models(app=None):
    models = filter(lambda item: not hasattr(item, "reversion_hide"), reversion.get_registered_models())
    if app is not None:
        models = filter(lambda item: item in apps.get_app_config(app).get_models(), models)
    # Don't allow modifying original list!
    return list(models).copy()


# TODO Default filter of having permission to view associated object
def filter_models(models, user):
    if user is not None:
        models = filter(
            lambda model: not hasattr(model, "reversion_perm") or user.has_perm(model.reversion_perm), models
        )
    return models


class ActivityTable(generic.ListView):
    model = RIGSVersion
    template_name = "activity_table.html"
    paginate_by = 25

    def get_queryset(self):
        return RIGSVersion.objects.get_for_multiple_models(
            filter_models(self.kwargs.get("models"), self.request.user)
        ).order_by("-revision__date_created")

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        context["page_title"] = f"{title(self.kwargs['app'])} Activity Stream"
        if self.kwargs["app"] != "rigboard":
            context["override"] = f"base_{self.kwargs['app']}.html"

        return context


class ActivityFeed(generic.ListView):  # Appears on homepage
    model = RIGSVersion
    template_name = "activity_feed_data.html"
    paginate_by = 25

    def get_queryset(self):
        return RIGSVersion.objects.get_for_multiple_models(filter_models(get_models(), self.request.user)).order_by(
            "-revision__date_created"
        )

    def get_context_data(self, **kwargs):
        # Call the base implementation first to get a context
        context = super().get_context_data(**kwargs)
        context["page_title"] = "Activity Feed"
        maxTimeDelta = datetime.timedelta(hours=1)

        items = []

        for thisVersion in context["object_list"]:
            thisVersion.withPrevious = False
            if len(items) >= 1:
                timeDiff = items[-1].revision.date_created - thisVersion.revision.date_created
                timeTogether = timeDiff < maxTimeDelta
                sameUser = thisVersion.revision.user_id == items[-1].revision.user_id
                thisVersion.withPrevious = timeTogether & sameUser

            items.append(thisVersion)

        return context