import {
  assertSecret,
  fetchTankDefinitions,
  PopularTanks,
} from '@blitzkit/core';
import { google } from 'googleapis';
import { commitAssets } from '../core/github/commitAssets';

export async function popularTanks() {
  const tankDefinitions = await fetchTankDefinitions();

  const auth = await google.auth.getClient({
    keyFile: import.meta.env.GOOGLE_APPLICATION_CREDENTIALS,
    scopes: ['https://www.googleapis.com/auth/analytics.readonly'],
  });
  const analytics = google.analyticsdata({ version: 'v1beta', auth });
  const report = await analytics.properties.runReport({
    property: `properties/${assertSecret(import.meta.env.PUBLIC_GOOGLE_ANALYTICS_PROPERTY_ID)}`,
    requestBody: {
      dateRanges: [{ startDate: '7daysAgo', endDate: 'today' }],
      dimensions: [{ name: 'pagePath' }],
      metrics: [{ name: 'screenPageViews' }],
      orderBys: [{ metric: { metricName: 'screenPageViews' }, desc: true }],
      dimensionFilter: {
        filter: {
          fieldName: 'pagePath',
          stringFilter: {
            matchType: 'BEGINS_WITH',
            value: '/tanks/',
          },
        },
      },
    },
  });

  if (!report.data.rows) {
    throw new Error('No rows in report');
  }

  const tanks = report.data.rows
    .filter(
      (row) =>
        row.dimensionValues &&
        row.dimensionValues[0].value &&
        row.dimensionValues[0].value !== '/tanks/' &&
        row.metricValues &&
        row.metricValues[0].value,
    )
    .map((row) => ({
      id: Number(
        row.dimensionValues![0].value!.match(
          /\/tools\/tankopedia\/(\d+)\/?/,
        )?.[1],
      ),
      views: Number(row.metricValues![0].value!),
    }))
    .filter((row) => {
      if (!(row.id in tankDefinitions.tanks)) {
        console.warn('Skipping unknown popular tank', row.id);
        return false;
      }

      return row.id in tankDefinitions.tanks;
    })
    .slice(0, 8)
    .map(({ id, views }) => ({ id, views }));
  const popularTanks: PopularTanks = { tanks };

  await commitAssets('popular tanks', [
    {
      path: 'definitions/popular-tanks.pb',
      content: PopularTanks.encode(popularTanks).finish(),
    },
  ]);
}