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

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

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

  if (db === 'mongodb') {
    return await client.websiteEvent.aggregateRaw({
      pipeline: [
        {
          $match: {
            $expr: {
              $and: [
                {
                  $eq: ['$website_id', websiteId],
                },
                {
                  $gte: [
                    '$created_at',
                    {
                      $dateFromString: {
                        dateString: resetDate.toISOString(),
                      },
                    },
                  ],
                },
                {
                  $gte: [
                    '$created_at',
                    {
                      $dateFromString: {
                        dateString: startDate.toISOString(),
                      },
                    },
                  ],
                },
                {
                  lte: [
                    '$created_at',
                    {
                      $dateFromString: {
                        dateString: endDate.toISOString(),
                      },
                    },
                  ],
                },
              ],
            },
          },
        },
        {
          $group: {
            _id: '$session_id',
          },
        },
        {
          $lookup: {
            from: 'session',
            localField: '_id',
            foreignField: '_id',
            as: 'session',
          },
        },
        {
          $project: {
            session: {
              $arrayElemAt: ['$session', 0],
            },
          },
        },
        {
          $group: {
            _id: '$session.' + column,
            sum: {
              $sum: 1,
            },
          },
        },
        {
          $project: {
            x: '$_id',
            y: '$sum',
            _id: 0,
          },
        },
        {
          $sort: {
            sum: -1,
          },
        },
        {
          $limit: 100,
        },
      ],
    });
  } else {
    return rawQuery(
      `select ${column} x, count(*) y
    from session as x
    where x.session_id in (
      select website_event.session_id
      from website_event
        join website 
          on website_event.website_id = website.website_id
        ${joinSession}
      where website.website_id = $1${toUuid()}
        and website_event.created_at >= $2
        and website_event.created_at between $3 and $4
      ${filterQuery}
    )
    group by 1
    order by 2 desc
    limit 100`,
      params,
    );
  }
}
async function clickhouseQuery(
  websiteId: string,
  data: { startDate: Date; endDate: Date; column: string; filters: object },
) {
  const { startDate, endDate, column, filters = {} } = data;
  const { getDateFormat, parseFilters, getBetweenDates, rawQuery } = clickhouse;
  const website = await loadWebsite(websiteId);
  const resetDate = new Date(website?.resetAt || website?.createdAt);
  const params = { websiteId };
  const { filterQuery } = parseFilters(filters, params);

  return rawQuery(
    `select ${column} x, count(distinct session_id) y
    from website_event as x
    where website_id = {websiteId:UUID}
    and event_type = ${EVENT_TYPE.pageView}
      and created_at >= ${getDateFormat(resetDate)}
      and ${getBetweenDates('created_at', startDate, endDate)}
      ${filterQuery}
    group by x
    order by y desc
    limit 100`,
    params,
  );
}