import clickhouse from '@/lib/clickhouse';
import { CLICKHOUSE, PRISMA, runQuery } from '@/lib/db';
import prisma from '@/lib/prisma';
import type { QueryFilters } from '@/lib/types';

const FUNCTION_NAME = 'getEventDataStats';

export async function getEventDataStats(
  ...args: [websiteId: string, filters: QueryFilters]
): Promise<{
  events: number;
  properties: number;
  records: number;
}> {
  return runQuery({
    [PRISMA]: () => relationalQuery(...args),
    [CLICKHOUSE]: () => clickhouseQuery(...args),
  }).then(results => results?.[0]);
}

async function relationalQuery(websiteId: string, filters: QueryFilters) {
  const { rawQuery, parseFilters } = prisma;
  const { filterQuery, joinSessionQuery, cohortQuery, queryParams } = parseFilters({
    ...filters,
    websiteId,
  });

  return rawQuery(
    `
    select 
      count(distinct t.website_event_id) as "events",
      count(distinct t.data_key) as "properties",
      sum(t.total) as "records"
    from (
      select
        website_event_id,
        data_key,
        count(*) as "total"
      from event_data
      join website_event on website_event.event_id = event_data.website_event_id
        and website_event.website_id = {{websiteId::uuid}}
        and website_event.created_at between {{startDate}} and {{endDate}}
      ${cohortQuery}
      ${joinSessionQuery}
      where event_data.website_id = {{websiteId::uuid}}
        and event_data.created_at between {{startDate}} and {{endDate}}
      ${filterQuery}
      group by website_event_id, data_key
      ) as t
    `,
    queryParams,
    FUNCTION_NAME,
  );
}

async function clickhouseQuery(
  websiteId: string,
  filters: QueryFilters,
): Promise<{ events: number; properties: number; records: number }[]> {
  const { rawQuery, parseFilters } = clickhouse;
  const { filterQuery, cohortQuery, queryParams } = parseFilters({ ...filters, websiteId });

  return rawQuery(
    `
    select 
      count(distinct t.event_id) as "events",
      count(distinct t.data_key) as "properties",
      sum(t.total) as "records"
    from (
      select
        event_id,
        data_key,
        count(*) as "total"
      from event_data
      join website_event
      on website_event.event_id = event_data.event_id
        and website_event.website_id = event_data.website_id
        and website_event.website_id = {websiteId:UUID}
        and website_event.created_at between {startDate:DateTime64} and {endDate:DateTime64}
      ${cohortQuery}
      where event_data.website_id = {websiteId:UUID}
        and event_data.created_at between {startDate:DateTime64} and {endDate:DateTime64}
      ${filterQuery}
      group by event_id, data_key
      ) as t
    `,
    queryParams,
    FUNCTION_NAME,
  );
}