import prisma from 'lib/prisma';
import clickhouse from 'lib/clickhouse';
import { runQuery, CLICKHOUSE, PRISMA } from 'lib/db';
import { DEFAULT_CREATED_AT, EVENT_TYPE } from 'lib/constants';
import { loadWebsite } from 'lib/query';

export async function getWebsiteStats(
  ...args: [
    websiteId: string,
    data: { startDate: Date; endDate: Date; type?: string; filters: object },
  ]
) {
  return runQuery({
    [PRISMA]: () => relationalQuery(...args),
    [CLICKHOUSE]: () => clickhouseQuery(...args),
  });
}

async function relationalQuery(
  websiteId: string,
  criteria: { startDate: Date; endDate: Date; filters: object },
) {
  const { startDate, endDate, filters = {} } = criteria;
  const { toUuid, getDateQuery, getTimestampInterval, parseFilters, rawQuery } = prisma;
  const website = await loadWebsite(websiteId);
  const resetDate = new Date(website?.resetAt || DEFAULT_CREATED_AT);
  const params: any = [websiteId, resetDate, startDate, endDate];
  const { filterQuery, joinSession } = parseFilters(filters, params);

  return rawQuery(
    `select sum(t.c) as "pageviews",
        count(distinct t.session_id) as "uniques",
        sum(case when t.c = 1 then 1 else 0 end) as "bounces",
        sum(t.time) as "totaltime"
      from (
        select website_event.session_id,
          ${getDateQuery('website_event.created_at', 'hour')},
          count(*) c,
          ${getTimestampInterval('website_event.created_at')} as "time"
        from website_event
          join website 
            on website_event.website_id = website.website_id
          ${joinSession}
        where event_type = ${EVENT_TYPE.pageView}
          and website.website_id = $1${toUuid()}
          and website_event.created_at >= $2
          and website_event.created_at between $3 and $4
          ${filterQuery}
        group by 1, 2
     ) t`,
    params,
  );
}

async function clickhouseQuery(
  websiteId: string,
  criteria: { startDate: Date; endDate: Date; filters: object },
) {
  const { startDate, endDate, filters = {} } = criteria;
  const { rawQuery, getDateFormat, getDateQuery, getBetweenDates, parseFilters } = clickhouse;
  const website = await loadWebsite(websiteId);
  const resetDate = new Date(website?.resetAt || DEFAULT_CREATED_AT);
  const params = { websiteId };
  const { filterQuery } = parseFilters(filters, params);

  return rawQuery(
    `select 
       sum(t.c) as "pageviews",
       count(distinct t.session_id) as "uniques",
       sum(if(t.c = 1, 1, 0)) as "bounces",
       sum(if(max_time < min_time + interval 1 hour, max_time-min_time, 0)) as "totaltime"
     from (
       select session_id,
         ${getDateQuery('created_at', 'day')} time_series,
         count(*) c,
         min(created_at) min_time,
         max(created_at) max_time
       from website_event
       where event_type = ${EVENT_TYPE.pageView}
        and website_id = {websiteId:UUID}
          and created_at >= ${getDateFormat(resetDate)}
          and ${getBetweenDates('created_at', startDate, endDate)}
         ${filterQuery}
       group by session_id, time_series
     ) t;`,
    params,
  );
}