from django.shortcuts import render
from django.http import JsonResponse

import os
from pathlib import Path
import json

from rest_framework.decorators import api_view
from rest_framework.response import Response

# Create your views here.

@api_view(['GET'])
def apiOverview(request):
    api_urls={
        'List':'/content-list/<str:level>/<str:tandard>',
        'Detail':'/content-detail/<str:level>/<str:standard>/<str:pk>/',
        'Create':'/content-create/',
        'Update':'/content-update/<str:level>/<str:standard>/<str:pk>/',
        'Delete':'/content-delete/<str:pk>/',
    }
    return Response(api_urls)

@api_view(['GET'])
def contentList(request,level,standard):

    module_path  = filePath(level, standard)

    with open(module_path) as json_file:
        data = json.load(json_file)

    return Response(data)

@api_view(['GET'])
def contentDetail(request,level,standard, pk):
    module_path  = filePath(level, standard)

    with open(module_path) as json_file:
        data = json.load(json_file)

    for obj in data:
        if obj['ID'] == int(pk):
            data = obj

    return Response(data)

@api_view(['POST'])
def contentCreate(request):
    BASE_DIR = Path(__file__).resolve().parent.parent
    module_path = os.path.join(BASE_DIR, 'static/data/2 Concepts, Policy and Strategy of the IDDRS/2.10 The UN Approach to DDR.json')

    with open(module_path) as json_file:
        data = json.load(json_file)

    ids = []
    for obj in data:
        ids.append(obj['ID'])
    new_id = max(ids)+1

    new_obj = request.data
    new_obj['ID'] = new_id
    data.append(new_obj)

    with open(module_path, 'w') as f:
        json.dump(data, f)

    return Response(new_obj)

@api_view(['POST'])
def contentUpdate(request,level,standard, pk):
    module_path  = filePath(level, standard)

    with open(module_path) as json_file:
        data = json.load(json_file)

    for obj in data:
        if obj['ID'] == int(pk):
            content_to_update = obj
            break

    updated_content = request.data

    for obj in data:
        if obj['ID'] == int(pk):
            data[int(pk)] = updated_content

    with open(module_path, 'w') as f:
        json.dump(data, f)

    return Response(content_to_update)

@api_view(['DELETE'])
def contentDelete(request, pk):
    BASE_DIR = Path(__file__).resolve().parent.parent
    module_path = os.path.join(BASE_DIR, 'static/data/2 Concepts, Policy and Strategy of the IDDRS/2.10 The UN Approach to DDR.json')

    with open(module_path) as json_file:
        data = json.load(json_file)

    for i in range(len(data)):
        if data[i]['ID'] == int(pk):
            data.pop(i)
            break
    # data = filter(lambda x: x['ID']!=int(pk), data)
    with open(module_path, 'w') as f:
        json.dump(data, f)

    return Response('ITEM succesesfully deleted!')


# Finde the targeted module to store the new paragraph in
# it returns the file path
def filePath(level_input, standard_input):
    BASE_DIR = Path(__file__).resolve().parent.parent
    standards_dir = os.path.join(BASE_DIR, 'static/data/')
    file_path = ''
    levels = []
    for rootdir, dirs, files in os.walk(standards_dir):
        for subdir in dirs:
            levels.append(subdir)
    for level in levels:
        if level[0] == str(level_input):
            filenames = next(os.walk(standards_dir+level), (None, None, []))[2]
            for file in filenames:
                if file[:4] == str(standard_input):
                    file_path = standards_dir+level+'/'+file
          
    return file_path