from typing import List

import json
import logging

import bottle

from icalendar_timeseries_server.config import get_config
from icalendar_timeseries_server.event import Metric
from icalendar_timeseries_server.cal import get_calendar
from icalendar_timeseries_server.query import MetricQuery


@bottle.route('/api/v1/query')
@bottle.route('/api/v1/query_range')
def prometheus_api():
    events: List[Metric] = []

    try:
        q = MetricQuery(bottle.request.query['query'])
    except ValueError as e:
        response = {
            'status': 'error',
            'errorType': 'bad_data',
            'error': str(e)
        }
        bottle.response.status = 400
        logging.exception('Cannot parse PromQL query')
        bottle.response.add_header('Content-Type', 'application/json')
        return json.dumps(response)

    try:
        for name in get_config().calendars.keys():
            events.extend(get_calendar(name))
        events = list(filter(q, events))
        events.sort(key=lambda e: e.start)
        response = {
            'status': 'success',
            'data': {
                'resultType': 'vector',
                'result': [e.serialize() for e in events]
            }
        }
    except BaseException:
        response = {
            'status': 'error',
            'errorType': 'internal',
            'error': 'An internal error occurred.'
        }
        bottle.response.status = 500
        logging.exception('An internal error occurred')

    bottle.response.add_header('Content-Type', 'application/json')
    return json.dumps(response)