# By: Riasat Ullah
# This file serves group related pages and data.

from constants import api_paths, component_names as cnm, label_names as lnm, pages, var_names
from context_manager import configurations_context, tutorials_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_policies
from translators import label_translator as lt
from utils import helpers, logging
from validations import request_validator
import json


@require_http_methods(['GET', 'POST'])
def get_escalation_policies_list(request):
    '''
    GET: Returns the escalation policies page.
    POST: Gets the list of escalation policies.
    :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_escalation_policies, nav_bar_components
            )
            if not has_view_perm:
                raise exceptions.PermissionDenied

            context = configurations_context.get_escalation_policy_list_context(lang, nav_bar_components)
            context[var_names.has_edit_permission] = has_edit_perm
            return render(request, pages.escalation_policy_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_policies.policies_list, safe=False)
            else:
                body = dict()
                status, output = helpers.post_api_request(api_paths.escalation_policies_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_escalation_policy_details(request, policy_ref_id=None):
    '''
    Gets data for schedules.
    :param request: Http request
    :param policy_ref_id: the reference ID of the escalation policy
    :return: JSON response
    '''
    if request.method == 'GET':
        if request_validator.user_in_session(request):
            try:
                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_escalation_policies, nav_bar_components
                )
                if not has_view_perm or (policy_ref_id is None and not has_edit_perm):
                    raise exceptions.PermissionDenied

                context = configurations_context.get_escalation_policy_details_context(lang, nav_bar_components)
                context[var_names.context] = json.dumps({var_names.policy_ref_id: policy_ref_id})
                context[var_names.has_edit_permission] = has_edit_perm
                context[var_names.has_component_flexible_role] =\
                    True if cnm.feat_users_component_flexible_role in request_validator.get_component_features(request)\
                    else False
                context[var_names.has_contextual_search_permission] = request_validator.has_edit_permission(
                    request, cnm.dis_com_tags)
                context = {**context, **tutorials_context.get_onboarding_escalation_policy_context(lang)}

                if 'flow' in request.GET:
                    context[var_names.flow_id] = request.GET.get('flow')
                if 'step' in request.GET:
                    context[var_names.step_number] = request.GET.get('step')
                if 'tutorial' in request.GET:
                    context[var_names.tutorial_name] = request.GET.get('tutorial')

                return render(request, pages.escalation_policy_details_page, context=context)
            except ValueError as e:
                logging.exception(str(e))
                return render(request, pages.escalation_policy_list_page)
        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_policies.policy_details[policy_ref_id], safe=False)
            else:
                body = {var_names.policy_ref_id: policy_ref_id}
                status, output = helpers.post_api_request(api_paths.escalation_policies_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_escalation_policy(request):
    '''
    Creates a group.
    :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('', safe=False)
            else:
                status, output = helpers.post_api_request(api_paths.escalation_policies_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_escalation_policy(request):
    '''
    Edits a group.
    :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('', safe=False)
            else:
                status, output = helpers.post_api_request(api_paths.escalation_policies_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_escalation_policy(request):
    '''
    Deletes a group.
    :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('', safe=False)
            else:
                status, output = helpers.post_api_request(api_paths.escalation_policies_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)