"""
Views relating to importing and exporting collection items
"""
"""
from interface.views import EnsembleMixin
from library.views import WorkMixin
from django.views.generic import View
from django.http import JsonResponse

from djantic import ModelSchema
from library.models import Work, Document, Section

class DocumentSchema(ModelSchema):
    class Config:
        model = Document


class WorkSchema(ModelSchema):

    docs: DocumentSchema

    class Config:
        model = Work
        exclude = ['licence']

class WorkExportView(EnsembleMixin, WorkMixin, View):
    
    def get(self, request, *args, **kwargs):
        obj = self.get_queryset().get(pk=kwargs['pk'])
        schema = WorkSchema.from_orm(obj)
        return JsonResponse(schema.dict())

"""

from interface.views import AuthorizedResourceMixin

from rest_framework import routers, serializers, viewsets

from library.models import Collection, Work, Document, Section, WorkMeta


import requests
from io import BytesIO
import tempfile
import shutil

from django.db import transaction
from django.core.files.uploadedfile import TemporaryUploadedFile

class WorkMetaSerializer(serializers.ModelSerializer):
    class Meta:
        model = WorkMeta
        exclude = ['id', 'work']

    def to_representation(self, instance):
        return f"{instance.name}:{instance.value}"
    
    def to_internal_value(self, data):
        name, _, value = data.partition(':')
        return super().to_internal_value({'name': name, 'value': value})

class SectionSerializer(serializers.ModelSerializer):
    class Meta:
        model = Section
        exclude = ['id', 'doc']

    def to_representation(self, instance):
        start = instance.start or 0
        end = instance.end or 0
        return f"{instance.tag}:{start}:{end}"

    def to_internal_value(self, data):
        tag, section_type, start, end = data.split(":")
        try:
            start = int(start)
        except:
            start = 0
        try:
            end = int(end)
        except:
            end = 0
        return super().to_internal_value({'tag': tag, 'start': start, 'end': end})

class DocumentSerializer(serializers.ModelSerializer):

    upload = serializers.URLField()
    sections = SectionSerializer(many=True)
    #doctype = serializers.CharField(source='get_doctype_display')

    #def to_internal_value(self, data):
    #    r = requests.get(data['upload'], stream=True)
    #    with tempfile.NamedTemporaryFile('wb') as f:
    #        shutil.copyfileobj(r.raw, f)
    #        data['upload'] = f.name
    #        print(repr(data))
    #        return super().to_internal_value(data)

    def to_representation(self, instance):
        data = super().to_representation(instance)
        if data['upload'][0] == '/':
            data['upload'] = 'http://localhost:8000' + (data['upload'])
        return data

    def create(self, validated_data):
        print("CREATE", validated_data)
        return super().create(validated_data)

    def validate(self, data):
        print("VALIDATE", data)
        return super().validate(data)

    def validate_upload(self, value):
        print("VALIDATE", value)
        return value

    class Meta:
        model = Document
        exclude = ["id", "work", "version", "created"]

# Serializers define the API representation.
class WorkSerializer(serializers.ModelSerializer):

    docs = DocumentSerializer(many=True)
    meta_info = WorkMetaSerializer(many=True)
    
    class Meta:
        model = Work
        exclude = ['id', 'collection', 'projects', 'parent']

    def create(self, validated):
        with transaction.atomic():
            docs = validated.pop('docs', [])
            meta = validated.pop('meta_info', [])
            work = Work.objects.create(**validated)

            for d in docs:
                sections = d.pop('sections', [])

                r = requests.get(d['upload'], stream=True)
                f = TemporaryUploadedFile(d['upload'], r.headers['content-type'], r.headers['content-length'], r.encoding)
                shutil.copyfileobj(r.raw, f.file)
                r.close()
                d['upload'] = f
                doc = Document.objects.create(work_id=work.pk, **d)

                for s in sections:
                    Section.objects.create(doc_id=doc.pk, **s)

            for m in meta:
                WorkMeta.objects.create(work_id=work.pk, **m)

            return work

class CollectionSerializer(serializers.Serializer):
    works = WorkSerializer(many=True)

    def create(self, validated):
        s = WorkSerializer()
        print(validated)
        collection = validated['collection_id']
        with transaction.atomic():
            for work in validated['works']:
                work['collection_id'] = collection
                s.create(work)
        return Collection.objects.get(pk=collection)
        

from rest_framework import generics

class CollectionExportView(AuthorizedResourceMixin, generics.RetrieveAPIView):
    serializer_class = CollectionSerializer

    def get_queryset(self):
        return Collection.objects.filter(administrators=self.request.user)

class WorkExportView(AuthorizedResourceMixin, generics.RetrieveAPIView):
    serializer_class = WorkSerializer

    def get_queryset(self):
        return Work.objects.filter(collection__administrators=self.request.user)

class WorkImportView(AuthorizedResourceMixin, generics.CreateAPIView):
    serializer_class = WorkSerializer

    def perform_create(self, serializer):
        serializer.save(collection_id=self.kwargs['pk'])

class CollectionImportView(AuthorizedResourceMixin, generics.CreateAPIView):
    serializer_class = CollectionSerializer

    def perform_create(self, serializer):
        serializer.save(collection_id=self.kwargs['pk'])