import json

from urllib.parse import urlparse
from django.http import HttpResponse
from django.utils.translation import gettext_lazy as _
from django.shortcuts import get_object_or_404, redirect, Http404
from django.views.generic.base import TemplateView
from django.urls import reverse_lazy, resolve
from django.views.generic.edit import (
    DeleteView,
    FormView,
)

from dashboard.mixins import  DashboardView, Http403
from evidence.models import Evidence, Annotation
from evidence.forms import (
    UploadForm,
    UserTagForm,
    ImportForm,
    EraseServerForm
)


class ListEvidencesView(DashboardView, TemplateView):
    template_name = "evidences.html"
    section = "evidences"
    title = _("Evidences")
    breadcrumb = "Evidences"

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        evidences = Evidence.get_all(self.request.user)

        context.update({
            'evidences': evidences,
        })
        return context


class UploadView(DashboardView, FormView):
    template_name = "upload.html"
    section = "evidences"
    title = _("Upload Evidence")
    breadcrumb = "Evidences / Upload"
    success_url = reverse_lazy('evidence:list')
    form_class = UploadForm

    def form_valid(self, form):
        form.save(self.request.user)
        response = super().form_valid(form)
        return response

    def form_invalid(self, form):
        #TODO: change file_input field class to "is-invalid" if any errors occur
        response = super().form_invalid(form)
        return response


class ImportView(DashboardView, FormView):
    template_name = "upload.html"
    section = "evidences"
    title = _("Import Evidence")
    breadcrumb = "Evidences / Import"
    success_url = reverse_lazy('evidence:list')
    form_class = ImportForm

    def get_form_kwargs(self):
        kwargs = super().get_form_kwargs()
        kwargs['user'] = self.request.user
        return kwargs

    def form_valid(self, form):
        form.save()
        response = super().form_valid(form)
        return response

    def form_invalid(self, form):
        response = super().form_invalid(form)
        return response


class EvidenceView(DashboardView, FormView):
    template_name = "ev_details.html"
    section = "evidences"
    title = _("Evidences")
    breadcrumb = "Evidences / Details"
    success_url = reverse_lazy('evidence:list')
    form_class = UserTagForm

    def get(self, request, *args, **kwargs):
        self.pk = kwargs['pk']
        self.object = Evidence(self.pk)
        if self.object.owner != self.request.user.institution:
            raise Http403

        self.object.get_annotations()
        return super().get(request, *args, **kwargs)

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        context.update({
            'object': self.object,
        })
        return context

    def get_form_kwargs(self):
        self.pk = self.kwargs.get('pk')
        kwargs = super().get_form_kwargs()
        kwargs['uuid'] = self.pk
        kwargs['user'] = self.request.user
        return kwargs

    def form_valid(self, form):
        form.save(self.request.user)
        response = super().form_valid(form)
        return response

    def form_invalid(self, form):
        response = super().form_invalid(form)
        return response

    def get_success_url(self):
        success_url = reverse_lazy('evidence:details', args=[self.pk])
        return success_url


class DownloadEvidenceView(DashboardView, TemplateView):

    def get(self, request, *args, **kwargs):
        pk = kwargs['pk']
        evidence = Evidence(pk)
        if evidence.owner != self.request.user.institution:
            raise Http403()

        evidence.get_doc()
        data = json.dumps(evidence.doc)
        response = HttpResponse(data, content_type="application/json")
        response['Content-Disposition'] = 'attachment; filename={}'.format("credential.json")
        return response


class AnnotationDeleteView(DashboardView, DeleteView):
    model = Annotation

    def get(self, request, *args, **kwargs):
        self.pk = kwargs['pk']

        try:
            referer = self.request.META["HTTP_REFERER"]
            path_referer = urlparse(referer).path
            resolver_match = resolve(path_referer)
            url_name = resolver_match.view_name
            kwargs_view = resolver_match.kwargs
        except:
            # if is not possible resolve the reference path return 404
            raise Http404

        self.object = get_object_or_404(
            self.model,
            pk=self.pk,
            owner=self.request.user.institution
        )
        self.object.delete()


        return redirect(url_name, **kwargs_view)


class EraseServerView(DashboardView, FormView):
    template_name = "ev_eraseserver.html"
    section = "evidences"
    title = _("Evidences")
    breadcrumb = "Evidences / Details"
    success_url = reverse_lazy('evidence:list')
    form_class = EraseServerForm

    def get(self, request, *args, **kwargs):
        self.pk = kwargs['pk']
        self.object = Evidence(self.pk)
        if self.object.owner != self.request.user.institution:
            raise Http403

        self.object.get_annotations()
        return super().get(request, *args, **kwargs)

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        context.update({
            'object': self.object,
        })
        return context

    def get_form_kwargs(self):
        self.pk = self.kwargs.get('pk')
        kwargs = super().get_form_kwargs()
        kwargs['uuid'] = self.pk
        kwargs['user'] = self.request.user
        return kwargs

    def form_valid(self, form):
        form.save(self.request.user)
        response = super().form_valid(form)
        return response

    def form_invalid(self, form):
        response = super().form_invalid(form)
        return response

    def get_success_url(self):
        success_url = reverse_lazy('evidence:details', args=[self.pk])
        return success_url