import React from 'react';
import { Flow } from './types';
import { nest } from 'd3-collection';
import { parseTime } from './time';
import { AppToaster } from './AppToaster';
import { Intent } from '@blueprintjs/core';
import { IconNames } from '@blueprintjs/icons';
import { ToastContent } from './Boxes';
import { ErrorsLocationsBlock, MAX_NUM_OF_IDS_IN_ERROR } from './FlowMap';

export function prepareFlows(rows: any[]) {
  let dupes: Flow[] = [];
  // Will sum up duplicate flows (with same origin, dest and time)
  const byOriginDestTime = nest<any, Flow>()
    .key((d: any) => d.origin)
    .key((d: any) => d.dest)
    .key((d: any) => parseTime(d.time)?.toISOString() || 'unknown')
    .rollup((dd) => {
      const { origin, dest, time } = dd[0];
      if (dd.length > 1) {
        dupes.push(dd[0]);
      }
      return {
        origin,
        dest,
        time: parseTime(time),
        count: dd.reduce((m, d) => {
          if (d.count != null) {
            const c = +d.count;
            if (!isNaN(c) && isFinite(c)) return m + c;
          }
          return m;
        }, 0),
      };
    })
    .entries(rows);
  const rv: Flow[] = [];
  for (const byDestTime of byOriginDestTime) {
    for (const byTime of byDestTime.values) {
      for (const { value } of byTime.values) {
        if (value.origin != null && value.dest != null) {
          rv.push(value);
        }
      }
    }
  }
  if (dupes.length > 0) {
    AppToaster.show({
      intent: Intent.WARNING,
      icon: IconNames.WARNING_SIGN,
      timeout: 0,
      message: (
        <ToastContent>
          The following flows (origin → dest pairs) were encountered more than once in the dataset:
          <ErrorsLocationsBlock>
            {(dupes.length > MAX_NUM_OF_IDS_IN_ERROR
              ? dupes.slice(0, MAX_NUM_OF_IDS_IN_ERROR)
              : dupes
            )
              .map(({ origin, dest }) => `${origin} → ${dest}`)
              .join(', ')}
            {dupes.length > MAX_NUM_OF_IDS_IN_ERROR &&
              ` … and ${dupes.length - MAX_NUM_OF_IDS_IN_ERROR} others`}
          </ErrorsLocationsBlock>
          Their counts were summed up.
        </ToastContent>
      ),
    });
  }
  return rv;
}