import mimetypes
import json
import os
from datetime import datetime

import boto3
from botocore.client import Config

from django.contrib.auth.models import User
from django.core import serializers
from django.views.decorators.csrf import csrf_exempt
from rest_framework import viewsets
from rest_framework import permissions
from rest_framework.response import Response
from rest_framework.decorators import action
from rest_framework.permissions import IsAuthenticated, AllowAny

from api.models import Item, SharedItem
from api.serializers import UserSerializer,GroupSerializer,ItemSerializer
from rest_framework import status
from annoying.functions import get_object_or_None
from khudrive.settings import AWS_SESSION_TOKEN, AWS_SECRET_ACCESS_KEY, AWS_ACCESS_KEY_ID, AWS_REGION, AWS_STORAGE_BUCKET_NAME

class UserViewSet(viewsets.ModelViewSet):
    """
    API endpoint that allows users to be viewed or edited.
    """
    queryset = User.objects.all().order_by('-date_joined')
    serializer_class = UserSerializer
    permission_classes = [permissions.IsAuthenticated]


class ItemViewSet(viewsets.ViewSet):

    queryset = Item.objects.all()
    serializer_class = ItemSerializer
    permission_classes = [permissions.IsAuthenticatedOrReadOnly, permissions.AllowAny,
                          #IsOwnerOrReadOnly
                          ]
    permission_classes_by_action = {'get': [permissions.AllowAny],
                                    'destroy': [permissions.AllowAny]}

    # url: items/search
    @action(methods=['GET'], detail=False, permission_classes=[AllowAny], url_path='search', url_name='search')
    def search(self, request):
        if request.method == 'GET':
            keyword = request.GET.get('keyword', '')
            item_list = Item.objects.filter(name__icontains = keyword)

            data = serializers.serialize("json", item_list)
            json_data = json.loads(data)
            res = []
            for i in json_data:
                t = i['fields']
                t['id'] = i['pk']
                res.append(t)
            return Response({'data': {'list' : res}}, status=status.HTTP_200_OK)
    """
    # url: items/11/
    # 마지막 slash도 써주어야함
    def get(self, request, pk):
        #print(pk)
        s3 = boto3.client('s3')
        s3_bucket = AWS_STORAGE_BUCKET_NAME

        #파일 객체 생성
        object_name = request.GET.get('name', '')

        presigned_url = s3.generate_presigned_url(
            'get_object',
            Params={'Bucket': s3_bucket,
                    'Key': object_name},
            ExpiresIn = 3600
        )

        return Response({'message': presigned_url}, status=status.HTTP_200_OK)
    """
    # url: items/11/
    # 마지막 slash도 써주어야함
    def get(self, request, pk):
        s3 = boto3.client('s3',
                        aws_access_key_id=AWS_ACCESS_KEY_ID,
                        aws_secret_access_key=AWS_SECRET_ACCESS_KEY,
                        aws_session_token=AWS_SESSION_TOKEN,
                        config=Config(signature_version='s3v4'))
        s3_bucket = AWS_STORAGE_BUCKET_NAME
        
        item = Item.objects.filter(item_id=pk)
        object_name = item.get().name
        data = serializers.serialize("json", item)
        json_data = json.loads(data)
        
        presigned_url = s3.generate_presigned_url(
            'get_object',
            Params={'Bucket': s3_bucket,
                    'Key': object_name},
            ExpiresIn = 3600
        )

        res = json_data[0]['fields']
        res['id']=json_data[0]['pk']
        res['signed_url']=presigned_url
        return Response({'data': res}, status=status.HTTP_200_OK)

    # url: items/11/
    # 마지막 slash도 써주어야함
    def destroy(self, request, pk):
        if request.method == 'DELETE':
            print(pk)
            item = get_object_or_None(Item, item_id=pk)
            if item != None:
                if item.is_folder == True: # 폴더는 삭제 안되도록 처리
                    return Response({'message': 'This item is folder.'}, status=status.HTTP_200_OK)
                item.is_deleted = True
                item.save()
                # item.delete() 이거 하면 완전 삭제되어버림 is deleted True 면 휴지통에서 리스트 조회할 수 있도록!
                return Response({'message': 'delete complete'},status=status.HTTP_200_OK)
            return Response({'message': 'item is not existed.'}, status=status.HTTP_204_NO_CONTENT)

    # url: items/11/move
    # 마지막 slash도 써주어야함
    @action(methods=['POST'], detail=True, permission_classes=[AllowAny], url_path='move', url_name='move')
    def move(self, request, pk):
        if request.method == 'POST':
            parent_id = request.POST.get('parent', '')
            name = request.POST.get('name','')
            parent = get_object_or_None(Item, item_id=parent_id)
            if parent != None and parent.is_folder == True:
                child = get_object_or_None(Item, item_id=pk)
                if child == None:
                    return Response({'message': 'item is not existed.'}, status=status.HTTP_204_NO_CONTENT)
                child.parent = parent_id
                child.save()
                child = Item.objects.filter(item_id = pk)
                child_data = serializers.serialize("json", child)
                json_child = json.loads(child_data)
                res = json_child[0]['fields']
                res['id'] = pk
                parent = Item.objects.filter(item_id = parent_id)
                parent_data = serializers.serialize("json", parent)
                json_parent = json.loads(parent_data)[0]['fields']
                res['parentInfo'] = json_parent
                return Response({'data': res}, status=status.HTTP_200_OK)
            if parent == None:
                return Response({'message': 'parent is not existed.'}, status=status.HTTP_200_OK)
            if parent.is_folder == False:
                return Response({'message': 'parent is not folder.'}, status=status.HTTP_200_OK)
            return Response({'message': 'item is not existed.'}, status=status.HTTP_204_NO_CONTENT)

    @action(methods=['POST'], detail=True, permission_classes=[AllowAny], url_path='copy', url_name='copy')
    def copy(self, request, pk):
        if request.method == 'POST':
            parent_id = request.POST.get('parent', '')
            parent = get_object_or_None(Item, item_id=parent_id)
            if parent != None and parent.is_folder == True:
                child = get_object_or_None(Item, item_id=pk)
                if child == None:
                    return Response({'message': 'item is not existed.'}, status=status.HTTP_204_NO_CONTENT)
                if child.is_folder == True:
                    return Response({'message': 'item is folder'}, status=status.HTTP_204_NO_CONTENT)
                copiedName = child.name + "_복사본_" + str(datetime.now().strftime('%Y-%m-%d %H:%M'))
                copiedItem = Item(is_folder = False, name = copiedName, path =child.path, parent = parent_id, user_id= child.user_id, size=child.size, status=child.status)
                copiedItem.save()

                copiedItem = Item.objects.filter(name = copiedName)
                copied_data = serializers.serialize("json", copiedItem)
                json_data = json.loads(copied_data)
                res = json_data[0]['fields']
                res['id'] = json_data[0]['pk']
                parent = Item.objects.filter(item_id = parent_id)
                parent_data = serializers.serialize("json", parent)
                json_parent = json.loads(parent_data)[0]['fields']
                res['parentInfo'] = json_parent
                return Response({'data': res}, status=status.HTTP_200_OK)
            if parent == None:
                return Response({'message': 'parent is not existed.'}, status=status.HTTP_200_OK)
            if parent.is_folder == False:
                return Response({'message': 'parent is not folder.'}, status=status.HTTP_200_OK)
            return Response({'message': 'item is not existed.'}, status=status.HTTP_204_NO_CONTENT)

    def get_permissions(self):
        try:
            # return permission_classes depending on `action`
            return [permission() for permission in self.permission_classes_by_action[self.action]]
        except KeyError:
            # action is not set return default permission_classes
            return [permission() for permission in self.permission_classes]

    #url: items/{key}/children/
    @action(methods=['GET', 'POST'], detail=True, permission_classes=[AllowAny],
            url_path='children', url_name='children')
    def children(self, request, pk, *args, **kwargs):
        if request.method == 'GET':
            parent_item = Item.objects.get(item_id = pk)
            try:
                parent_item = get_object_or_404(Item, pk = pk)
            except parent_item.DoesNotExist:
                return Response({'Error': 'Folder does not exist.'})
            items = Item.objects.get(parent = parent_item.pk)
            return Response(items, status=status.HTTP_200_OK)

        if request.method == 'POST':
            data = JSONParser().parse(request)
            serializer = ItemSerializer(data=data)
            if serializer.is_valid():
                serializer.save()
                return Response(serializer.data, status=status.HTTP_200_OK)
            return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)
    
    # url: /upload/
    @action(methods=['POST'], detail=True, permission_classes=[AllowAny],
                     url_path='upload', url_name='upload')
    def upload(self, request, pk):
        if request.method == 'POST':
            s3 = boto3.client('s3')
            s3_bucket = AWS_STORAGE_BUCKET_NAME

            #파일 객체 생성
            file_name = request.POST.get('name', '')
            file_size = request.POST.get('size', '')
            file_parent = pk
            file_type = mimetypes.guess_type(file_name)[0]
            upload_item = Item(name=file_name, size=file_size, user_id=1, file_type=file_type, parent=file_parent)
            upload_item.save()

            date_long = datetime.utcnow().strftime('%Y%m%dT000000Z')

            presigned_post = s3.generate_presigned_post(
                s3_bucket,
                file_name,
                {
                    "acl": "private",
                    "Content-Type": file_type,
                    'region': AWS_REGION,
                    'x-amz-algorithm': 'AWS4-HMAC-SHA256',
                    'x-amz-date': date_long
                },
                [
                    {"acl": "private"},
                    {"Content-Type": file_type},
                    {'x-amz-algorithm': 'AWS4-HMAC-SHA256'},
                    {'x-amz-date': date_long}
                ],
                3600
            )
            
            data = {
                "signed_url": presigned_post,
                'url': 'https://%s.s3.amazonaws.com/%s' % (s3_bucket, file_name)
            }
            
            return Response({'presigned_post':presigned_post, 'proc_data':data}, status=status.HTTP_200_OK)
    
    # url: /status/
    @action(methods=['POST'], detail=True, permission_classes=[AllowAny],
                     url_path='status', url_name='status')
    def status(self, request, *args, **kwargs):
        if request.method == 'POST':
            pk = request.POST.get('item_id', '')
            queryset = Item.objects.filter(item_id = pk)
            for cand in queryset:
                cand.status = True
                cand.save()
                return Response({'Message': 'File Upload Successful'}, status=status.HTTP_200_OK)
            return Response({'Error': 'No such item found in queryset'}, status=status.HTTP_400_BAD_REQUEST)





class SharedItemViewSet(viewsets.ModelViewSet):

    queryset = SharedItem.objects.all()
    # serializer_class = SharedItemSerializer
    permission_classes = [permissions.IsAuthenticatedOrReadOnly, permissions.AllowAny,
                          # IsOwnerOrReadOnly
                          ]
    # url: http://localhost:8000/items/1/share/
    # 마지막 slash도 써주어야함
    @csrf_exempt
    @action(methods=['POST'], detail=True, permission_classes=[AllowAny], url_path='share', url_name='share')
    def share(self, request, pk):
        if request.method == 'POST':
            password = request.POST.get('password', '')
            expires = request.POST.get('expires', '')

            sharedfile = get_object_or_None(SharedItem, item_id=pk)
            if sharedfile != None:
                # 서버는 정상이나 이미 공유객체로 등록된 파일임
                return Response({'message': 'This file is already shared'}, status=status.HTTP_200_OK)
            sharedfile = SharedItem(item_id =pk, password=password, expires = expires)
            sharedfile.save()
            sharedfile = SharedItem.objects.get(item_id = pk)

            # sf = serializers.serialize("json", sharedfile)
            item = Item.objects.filter(item_id = pk)
            item_json = serializers.serialize("json", item)

            json_data = json.loads(item_json)
            print(json_data)
            res = json_data[0]['fields']
            res['id'] = json_data[0]['pk']
            return Response({"shared": sharedfile.created_time , 'data': res}, status=status.HTTP_200_OK)

item = ItemViewSet.as_view({
    'delete': 'destroy',
})