import json
from pathlib import Path

from flask import Flask, Response, request
from icinga2api.client import Client

client = Client('https://localhost:8080', 'icingaweb2', 'password1234')

OK = 0
WARNING = 1
CRITICAL = 2
UNKNOWN = 3

app = Flask(__name__)


def return_json(json_dict, start_response, status_code=200):
    headers = [('Content-Type', 'application/json')]
    start_response(str(status_code), headers)
    return iter([json.dumps(json_dict).encode('utf-8')])


@app.route('/host')
@app.route('/host/')
@app.route("/host/<hostid>")
def get_host_state(hostid=None):
    path = Path(request.base_url)
    args_service = request.args.getlist('service')
    kuma_mode = True if request.args.get('kuma') == 'true' else False

    if not hostid:
        return Response(json.dumps({'error': 'must specify host'}), status=406, mimetype='application/json')

    result = {
        'host': {},
        'services': {},
        'failed_services': []
    }

    host_status = client.objects.list('Host', filters='match(hpattern, host.name)', filter_vars={'hpattern': hostid})
    if not len(host_status):
        return Response(json.dumps({'error': 'could not find host'}), status=404, mimetype='application/json')
    else:
        host_status = host_status[0]

    result['host'] = {
        'name': host_status['name'],
        'state': 0 if (host_status['attrs']['acknowledgement'] or host_status['attrs']['acknowledgement_expiry']) else host_status['attrs']['state'],
        'actual_state': host_status['attrs']['state'],
        'attrs': {
            **host_status['attrs']
        }
    }

    services_status = client.objects.list('Service', filters='match(hpattern, host.name)', filter_vars={'hpattern': hostid})
    for attrs in services_status:
        name = attrs['name'].split('!')[1]
        result['services'][name] = {
            'state': 0 if (attrs['attrs']['acknowledgement'] or attrs['attrs']['acknowledgement_expiry']) else attrs['attrs']['state'],
            'actual_state': attrs['attrs']['state'],
            'attrs': {
                **attrs
            }
        }

    if len(args_service):
        services = {}
        for service in args_service:
            if service in result['services'].keys():
                services[service] = result['services'][service]
            else:
                return Response(json.dumps({'error': 'service not found', 'service': service}), status=400, mimetype='application/json')
        result['services'] = services

    if kuma_mode:
        for name, service in result['services'].items():
            if service['state'] != OK:
                result['failed_services'].append({'name': name, 'state': service['state']})
        if result['host']['state'] != OK:
            result['failed_services'].append({'name': hostid, 'state': result['host']['state']})

    if len(result['failed_services']):
        return Response(json.dumps(result), status=410, mimetype='application/json')
    else:
        return result