import json

from uuid import uuid4

from django.urls import reverse_lazy
from django.http import JsonResponse
from django.shortcuts import get_object_or_404, redirect
from django.utils.translation import gettext_lazy as _
from django.views.decorators.csrf import csrf_exempt
from django_tables2 import SingleTableView
from django.views.generic.edit import (
    CreateView,
    DeleteView,
    UpdateView,
)

from utils.save_snapshots import move_json, save_in_disk
from dashboard.mixins import DashboardView
from evidence.models import Annotation
from evidence.parse import Build
from api.models import Token
from api.tables import TokensTable


@csrf_exempt
def NewSnapshot(request):
    # Accept only posts
    if request.method != 'POST':
        return JsonResponse({'error': 'Invalid request method'}, status=400)

    # Authentication
    auth_header = request.headers.get('Authorization')
    if not auth_header or not auth_header.startswith('Bearer '):
        return JsonResponse({'error': 'Invalid or missing token'}, status=401)

    token = auth_header.split(' ')[1]
    tk = Token.objects.filter(token=token).first()
    if not tk:
        return JsonResponse({'error': 'Invalid or missing token'}, status=401)

    # Validation snapshot
    try:
        data = json.loads(request.body)
    except json.JSONDecodeError:
        return JsonResponse({'error': 'Invalid JSON'}, status=400)

    # try:
    #     Build(data, None, check=True)
    # except Exception:
    #     return JsonResponse({'error': 'Invalid Snapshot'}, status=400)

    exist_annotation = Annotation.objects.filter(
        uuid=data['uuid']
    ).first()

    if exist_annotation:
        txt = "error: the snapshot {} exist".format(data['uuid'])
        return JsonResponse({'status': txt}, status=500)

    # Process snapshot
    path_name = save_in_disk(data, tk.owner.institution.name)

    try:
        Build(data, tk.owner)
    except Exception as err:
        return JsonResponse({'status': f"fail: {err}"}, status=500)

    annotation = Annotation.objects.filter(
        uuid=data['uuid'],
        type=Annotation.Type.SYSTEM,
        # TODO this is hardcoded, it should select the user preferred algorithm
        key="hidalgo1",
        owner=tk.owner.institution
    ).first()


    if not annotation:
        return JsonResponse({'status': 'fail'}, status=500)

    url_args = reverse_lazy("device:details", args=(annotation.value,))
    url = request.build_absolute_uri(url_args)

    response = {
        "status": "success",
        "dhid": annotation.value[:6].upper(),
        "url": url,
        # TODO replace with public_url when available
        "public_url": url
    }
    move_json(path_name, tk.owner.institution.name)

    return JsonResponse(response, status=200)


class TokenView(DashboardView, SingleTableView):
    template_name = "token.html"
    title = _("Credential management")
    section = "Credential"
    subtitle = _('Managament Tokens')
    icon = 'bi bi-key'
    model = Token
    table_class = TokensTable

    def get_queryset(self):
        """
        Override the get_queryset method to filter events based on the user type.
        """
        return Token.objects.filter().order_by("-id")

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        context.update({
            'tokens': Token.objects.all(),
        })
        return context


class TokenDeleteView(DashboardView, DeleteView):
    model = Token

    def get(self, request, *args, **kwargs):
        self.pk = kwargs['pk']
        self.object = get_object_or_404(self.model, pk=self.pk, owner=self.request.user)
        self.object.delete()

        return redirect('api:tokens')


class TokenNewView(DashboardView, CreateView):
    template_name = "new_token.html"
    title = _("Credential management")
    section = "Credential"
    subtitle = _('New Tokens')
    icon = 'bi bi-key'
    model = Token
    success_url = reverse_lazy('api:tokens')
    fields = (
        "tag",
    )

    def form_valid(self, form):
        form.instance.owner = self.request.user
        form.instance.token = uuid4()
        return super().form_valid(form)


class EditTokenView(DashboardView, UpdateView):
    template_name = "new_token.html"
    title = _("Credential management")
    section = "Credential"
    subtitle = _('New Tokens')
    icon = 'bi bi-key'
    model = Token
    success_url = reverse_lazy('api:tokens')
    fields = (
        "tag",
    )

    def get_form_kwargs(self):
        pk = self.kwargs.get('pk')
        self.object = get_object_or_404(
            self.model,
            owner=self.request.user,
            pk=pk,
        )
        kwargs = super().get_form_kwargs()
        return kwargs