from django.shortcuts import render,redirect
from .models import PlacementApplication
from django.http import HttpResponse
from .utils import *

import csv

@api_view(['POST'])
@isAuthorized(allowed_users=[ADMIN])
@precheck(required_data=[COL_NAMES, OPENING_ID])
def generateCSV(request, id, email, user_type):
    try:
        data = request.data
        applications=PlacementApplication.objects.filter(placement_id = data[OPENING_ID])
        filename = generateRandomString()
        destination_path = STORAGE_DESTINATION_APPLICATION_CSV + filename
        f = open(destination_path, 'w')
        writer = csv.writer(f)
        writer.writerow(COL_NAMES)
        for apl in applications:
            row_details=[]
            for col in COL_NAMES:
                if col == ROLL_NO:
                    row_details.append(apl.student.roll_no)
                if col == NAME:
                    row_details.append(apl.student.name)
                if col == BATCH:
                    row_details.append(apl.student.batch)
                if col == BRANCH:
                    row_details.append(apl.student.branch)
                if col == PHONE_NUMBER:
                    row_details.append(apl.student.phone_number)
                if col == CPI:
                    row_details.append(apl.student.cpi)
                if col == RESUME:
                    row_details.append(apl.student.resume)
            writer.writerow(apl)
        f.close()
        return Response({'action': "Create csv", 'message': "CSV created", 'file': filename},
                        status=status.HTTP_200_OK)
    except:
        logger.warning("Create csv: " + str(sys.exc_info()))
        return Response({'action': "Create csv", 'message': "Error Occurred"},
                        status=status.HTTP_400_BAD_REQUEST)