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

from constants import api_paths, component_names as cnm, label_names as lnm, pages, static_vars, var_names
from context_manager import itsm_context
from django.core import exceptions
from django.http import HttpResponse, 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_groups
from translators import label_translator as lt
from urllib.parse import urlencode
from utils import helpers, logging
from validations import request_validator
import json


@require_http_methods(['GET', 'POST'])
def list_groups(request):
    '''
    GET: Returns the groups list page.
    POST: Gets the list of groups.
    :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_itsm_groups, nav_bar_components
            )
            if not has_view_perm:
                raise exceptions.PermissionDenied

            context = itsm_context.get_group_list_context(lang, nav_bar_components)
            context[var_names.has_edit_permission] = has_edit_perm
            return render(request, pages.group_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):
            body = json.loads(request.body.decode())
            if settings.TEST_MODE:
                return JsonResponse(test_data_groups.groups_list, safe=False)
            else:
                status, output = helpers.post_api_request(api_paths.groups_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_group_details(request, group_ref_id=None):
    '''
    GET: Returns the group details page.
    POST: Get the details of a specific group.
    :param group_ref_id: reference ID of the group
    :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_itsm_groups, nav_bar_components
            )
            if not has_view_perm:
                raise exceptions.PermissionDenied

            context = itsm_context.get_group_details_context(lang, nav_bar_components)
            context[var_names.context] = json.dumps({var_names.group_ref_id: group_ref_id})
            context[var_names.has_edit_permission] = has_edit_perm
            return render(request, pages.group_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:
                return JsonResponse(test_data_groups.groups_details[group_ref_id], safe=False)
            else:
                body = {var_names.group_ref_id: group_ref_id}
                status, output = helpers.post_api_request(api_paths.groups_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(['GET', 'POST'])
def create_group(request):
    '''
    Create a new group.
    :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_edit_perm = request_validator.has_edit_permission(request, cnm.dis_com_itsm_groups)
            if not has_edit_perm:
                raise exceptions.PermissionDenied

            context = itsm_context.get_group_new_context(lang, nav_bar_components)
            return render(request, pages.group_new_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):
            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.groups_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_group(request):
    '''
    Edit a new group.
    :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(lt.get_label(lnm.msg_group_edited, lang), status=200, safe=False)
            else:
                status, output = helpers.post_api_request(api_paths.groups_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_group(request):
    '''
    Delete a group.
    :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(lt.get_label(lnm.msg_group_deleted, lang), status=200, safe=False)
            else:
                status, output = helpers.post_api_request(api_paths.groups_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 get_group_people(request):
    '''
    Get the people associated with a group.
    :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(test_data_groups.groups_details[body[var_names.group_ref_id]][var_names.people],
                                    status=200, safe=False)
            else:
                status, output = helpers.post_api_request(api_paths.groups_people, 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 add_group_people(request):
    '''
    Adds people to a group.
    :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(lt.get_label(lnm.msg_group_people_added, lang), status=200, safe=False)
            else:
                status, output = helpers.post_api_request(api_paths.groups_people_add, 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_group_people(request):
    '''
    Delete people from a group.
    :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(lt.get_label(lnm.msg_group_people_deleted, lang), status=200, safe=False)
            else:
                status, output = helpers.post_api_request(api_paths.groups_people_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)