import json
import logging
import hashlib

from django.views.generic.edit import View
from django.http import JsonResponse

from dpp.api_dlt import ALGORITHM
from evidence.models import Evidence
from evidence.parse import Build
from dpp.models import Proof

logger = logging.getLogger('django')


class ProofView(View):
    
    def get(self, request, *args, **kwargs):
        timestamp = kwargs.get("proof_id")
        proof = Proof.objects.filter(timestamp=timestamp).first()
        if not proof:
            return JsonResponse({}, status=404)

        logger.error(proof.type)
        logger.error(proof.signature)
        
        ev = Evidence(proof.uuid)
        if not ev.doc:
            return JsonResponse({}, status=404)
        
        dev = Build(ev.doc, None, check=True)
        doc = dev.get_phid()

        logger.error(doc)
        hs = hashlib.sha3_256(json.dumps(doc).encode()).hexdigest()
        logger.error(hs)

        data = {
            "algorithm": ALGORITHM,
            "document": json.dumps(doc)
        }

        d = {
            '@context': ['https://ereuse.org/proof0.json'],
            'data': data,
        }
        response = JsonResponse(d, status=200)
        response["Access-Control-Allow-Origin"] = "*"
        return response