# By: Riasat Ullah
# This file contains views for incident workflows.

from constants import api_paths, label_names as lnm, pages, var_names
from constants import component_names as cnm
from context_manager import automation_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_workflows
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_workflow_list(request):
    '''
    Returns the list of all incident workflows.
    :param request: Http request
    :return: Http 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_workflows, nav_bar_components
            )
            if not has_view_perm:
                raise exceptions.PermissionDenied

            context = automation_context.get_incident_workflow_list_context(lang, nav_bar_components)
            context[var_names.has_edit_permission] = has_edit_perm
            return render(request, pages.incident_workflow_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_workflows.incident_workflows_list, safe=False)
            else:
                body = dict()
                status, output = helpers.post_api_request(api_paths.workflows_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_workflow_details(request, workflow_ref_id=None):
    '''
    GET: Gets the page for creating new or editing an incident workflow.
    POST: Gets the details of an existing incident workflow given its reference ID.
    :param request: Http request
    :param workflow_ref_id: reference ID of the incident workflow
    :return: GET: html page  |  POST: details of the response set
    '''
    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_workflows, nav_bar_components
            )
            if not has_view_perm:
                raise exceptions.PermissionDenied

            context = automation_context.get_incident_workflow_details_context(lang, nav_bar_components)
            context[var_names.context] = json.dumps({var_names.workflow_ref_id: workflow_ref_id})
            context[var_names.has_edit_permission] = has_edit_perm
            return render(request, pages.incident_workflow_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 workflow_ref_id in test_data_workflows.incident_workflow_details:
                    return JsonResponse(
                        test_data_workflows.incident_workflow_details[workflow_ref_id], safe=False)
                else:
                    return JsonResponse(None, status=404, safe=False)
            else:
                body = {var_names.workflow_ref_id: workflow_ref_id}
                status, output = helpers.post_api_request(api_paths.workflows_details, body, request, lang=lang)
                return JsonResponse(output, status=status)
        else:
            return JsonResponse(lt.get_label(lnm.err_unauthorized_access, lang), status=401, safe=False)


@require_http_methods(['POST'])
def create_workflow(request):
    '''
    Creates a new incident workflow.
    :param request: Http request
    :return: Http 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.workflows_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_workflow(request):
    '''
    Edits an existing incident workflow.
    :param request: Http request
    :return: Http 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.workflows_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_workflow(request):
    '''
    Deletes an incident workflow.
    :param request: Http request
    :return: Http 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.workflows_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)


@require_http_methods(['POST'])
def enable_workflow(request):
    '''
    Enable/disable a workflow.
    :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', safe=False)
            else:
                status, output = helpers.post_api_request(api_paths.workflows_enable, 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)