# By: Riasat Ullah
# This file contains views for business services.

from constants import api_paths, label_names as lnm, pages, var_names
from constants import component_names as cnm
from context_manager import configurations_context
from django.core import exceptions
from django.http import JsonResponse
from django.shortcuts import redirect, render
from django.views.decorators.http import require_http_methods
from taskcallweb import settings
from system_tests.test_data import test_data_services
from translators import label_translator as lt
from utils import helpers
from validations import request_validator
import json


@require_http_methods(['GET', 'POST'])
def get_business_services_list(request):
    '''
    GET: Renders the business services list page.
    POST: Returns the list of all business services.
    :param request: Http request
    :return: GET: Http response  |  POST: JSON response
    '''
    if request.method == 'GET':
        if request_validator.user_in_session(request):
            lang = request_validator.get_user_language(request)
            nav_bar_components = request_validator.get_nav_bar_components(request)

            has_view_perm, has_edit_perm = request_validator.get_session_permission(
                request, cnm.dis_com_business_services, nav_bar_components
            )
            if not has_view_perm:
                raise exceptions.PermissionDenied

            context = configurations_context.get_business_service_list_context(lang, nav_bar_components)
            context[var_names.has_edit_permission] = has_edit_perm
            context[var_names.has_team_permission] = request_validator.get_team_permission_status(request)
            return render(request, pages.business_service_list_page, context=context)
        else:
            helpers.set_session_redirect_page(request)
            return redirect(pages.login_url)
    elif request.method == 'POST':
        lang = request_validator.get_user_language(request)
        if request_validator.user_in_session(request):
            if settings.TEST_MODE:
                return JsonResponse(test_data_services.business_services_list, safe=False)
            else:
                body = dict()
                status, output = helpers.post_api_request(api_paths.business_services_list, body, request, lang=lang)
                return JsonResponse(output, status=status, safe=False)
        else:
            return JsonResponse(lt.get_label(lnm.err_unauthorized_access, lang), status=401, safe=False)


@require_http_methods(['GET', 'POST'])
def get_business_service_details(request, business_service_ref_id=None):
    '''
    GET: Gets the page for creating new or editing a business service.
    POST: Gets the details of an existing business service given its reference ID.
    :param request: Http request
    :param business_service_ref_id: reference ID of the business service
    :return: GET: html page  |  POST: details of the business service
    '''
    if request.method == 'GET':
        if request_validator.user_in_session(request):
            lang = request_validator.get_user_language(request)
            nav_bar_components = request_validator.get_nav_bar_components(request)

            has_view_perm, has_edit_perm = request_validator.get_session_permission(
                request, cnm.dis_com_business_services, nav_bar_components
            )
            if not has_view_perm or (business_service_ref_id is None and not has_edit_perm):
                raise exceptions.PermissionDenied

            context = configurations_context.get_business_service_details_context(lang, nav_bar_components)
            context[var_names.has_team_permission] = request_validator.get_team_permission_status(request)
            context[var_names.context] = json.dumps({var_names.business_service_ref_id: business_service_ref_id})
            return render(request, pages.business_service_details_page, context=context)
        else:
            helpers.set_session_redirect_page(request)
            return redirect(pages.login_url)
    elif request.method == 'POST':
        lang = request_validator.get_user_language(request)
        if request_validator.user_in_session(request):
            if settings.TEST_MODE:
                if business_service_ref_id in test_data_services.business_service_details:
                    details = test_data_services.business_service_details[business_service_ref_id]
                    return JsonResponse(details, status=200)
                else:
                    return JsonResponse(None, status=404, safe=False)
            else:
                body = {var_names.business_service_ref_id: business_service_ref_id}
                status, output = helpers.post_api_request(api_paths.business_services_details, body, request, lang=lang)
                return JsonResponse(output, status=status, safe=False)
        else:
            return JsonResponse(lt.get_label(lnm.err_unauthorized_access, lang), status=401, safe=False)


@require_http_methods(['POST'])
def create_business_service(request):
    '''
    Creates a new business service.
    :param request: Http request
    :return: JSON response
    '''
    if request.method == 'POST':
        lang = request_validator.get_user_language(request)
        if request_validator.user_in_session(request):
            body = json.loads(request.body.decode())
            if settings.TEST_MODE:
                return JsonResponse('Action performed successfully', status=200, safe=False)
            else:
                status, output = helpers.post_api_request(api_paths.business_services_create, body, request, lang=lang)
                return JsonResponse(output, status=status, safe=False)
        else:
            return JsonResponse(lt.get_label(lnm.err_unauthorized_access, lang), status=401, safe=False)


@require_http_methods(['POST'])
def edit_business_service(request):
    '''
    Edits a business service.
    :param request: Http request
    :return: JSON response
    '''
    if request.method == 'POST':
        lang = request_validator.get_user_language(request)
        if request_validator.user_in_session(request):
            body = json.loads(request.body.decode())
            if settings.TEST_MODE:
                return JsonResponse('Action performed successfully', status=200, safe=False)
            else:
                status, output = helpers.post_api_request(api_paths.business_services_edit, body, request, lang=lang)
                return JsonResponse(output, status=status, safe=False)
        else:
            return JsonResponse(lt.get_label(lnm.err_unauthorized_access, lang), status=401, safe=False)


@require_http_methods(['POST'])
def delete_business_service(request):
    '''
    Deletes a business service.
    :param request: Http request
    :return: JSON response
    '''
    if request.method == 'POST':
        lang = request_validator.get_user_language(request)
        if request_validator.user_in_session(request):
            body = json.loads(request.body.decode())
            if settings.TEST_MODE:
                return JsonResponse('Action performed successfully', status=200, safe=False)
            else:
                status, output = helpers.post_api_request(api_paths.business_services_delete, body, request, lang=lang)
                return JsonResponse(output, status=status, safe=False)
        else:
            return JsonResponse(lt.get_label(lnm.err_unauthorized_access, lang), status=401, safe=False)