import { Netmask } from 'netmask';
import { ReactElement, useMemo } from 'react';

import AnHostInputGroup from './AnHostInputGroup';
import Grid from '../Grid';

const INPUT_ID_PREFIX_AN_HOST_CONFIG = 'an-host-config-input';

const INPUT_GROUP_ID_PREFIX_AHC = `${INPUT_ID_PREFIX_AN_HOST_CONFIG}-group`;
const INPUT_GROUP_CELL_ID_PREFIX_AHC = `${INPUT_GROUP_ID_PREFIX_AHC}-cell`;

const DEFAULT_HOST_LIST: ManifestHostList = {
  node1: {
    hostNumber: 1,
    hostType: 'node',
  },
  node2: {
    hostNumber: 2,
    hostType: 'node',
  },
};

const guessHostIpOnNetwork = ({
  anSeq,
  minIp,
  offset3 = 10,
  step3 = 2,
  subnetMask,
  subSeq,
}: {
  anSeq: number;
  minIp: string;
  offset3?: number;
  step3?: number;
  subnetMask: string;
  subSeq: number;
}): string => {
  try {
    const block = new Netmask(`${minIp}/${subnetMask}`);

    if (block.bitmask !== 16) {
      return `${block.base.replace(/\.0/g, '')}.`;
    }

    const third = (anSeq - 1) * step3 + offset3;
    const fourth = subSeq;

    return minIp.replace(/^((\d+\.){2})\d+\.\d+$/, `$1${third}.${fourth}`);
  } catch (error) {
    return '';
  }
};

const AnHostConfigInputGroup = <M extends MapToInputTestID>({
  anSequence,
  formUtils,
  knownFences = {},
  knownUpses = {},
  networkListEntries,
  previous: { hosts: previousHostList = DEFAULT_HOST_LIST } = {},
}: AnHostConfigInputGroupProps<M>): ReactElement => {
  const hostListEntries = useMemo(
    () => Object.entries(previousHostList),
    [previousHostList],
  );
  const knownFenceListValues = useMemo(
    () => Object.values(knownFences),
    [knownFences],
  );
  const knownUpsListValues = useMemo(
    () => Object.values(knownUpses),
    [knownUpses],
  );

  const hostListGridLayout = useMemo<GridLayout>(
    () =>
      hostListEntries.reduce<GridLayout>(
        (previous, [hostId, previousHostArgs]) => {
          const {
            fences: previousFenceList = {},
            hostNumber,
            hostType,
            ipmiIp,
            networks: previousNetworkList = {},
            upses: previousUpsList = {},
          }: ManifestHost = previousHostArgs;

          const fences = knownFenceListValues.reduce<ManifestHostFenceList>(
            (fenceList, { fenceName }) => {
              const { [fenceName]: { fencePort = '' } = {} } =
                previousFenceList;

              fenceList[fenceName] = { fenceName, fencePort };

              return fenceList;
            },
            {},
          );
          const networks = networkListEntries.reduce<ManifestHostNetworkList>(
            (
              networkList,
              [
                networkId,
                { networkMinIp, networkNumber, networkSubnetMask, networkType },
              ],
            ) => {
              let { [networkId]: { networkIp = '' } = {} } =
                previousNetworkList;

              if (!networkIp) {
                networkIp = guessHostIpOnNetwork({
                  anSeq: anSequence,
                  minIp: networkMinIp,
                  subnetMask: networkSubnetMask,
                  subSeq: hostNumber,
                });
              }

              networkList[networkId] = {
                networkIp,
                networkNumber,
                networkType,
              };

              return networkList;
            },
            {},
          );
          const upses = knownUpsListValues.reduce<ManifestHostUpsList>(
            (upsList, { upsName }) => {
              const { [upsName]: { isUsed = true } = {} } = previousUpsList;

              upsList[upsName] = { isUsed, upsName };

              return upsList;
            },
            {},
          );

          const cellId = `${INPUT_GROUP_CELL_ID_PREFIX_AHC}-${hostId}`;

          previous[cellId] = {
            children: (
              <AnHostInputGroup
                formUtils={formUtils}
                hostId={hostId}
                hostNumber={hostNumber}
                hostType={hostType}
                previous={{ fences, ipmiIp, networks, upses }}
              />
            ),
            md: 3,
            sm: 2,
          };

          return previous;
        },
        {},
      ),
    [
      anSequence,
      formUtils,
      hostListEntries,
      knownFenceListValues,
      knownUpsListValues,
      networkListEntries,
    ],
  );

  return (
    <Grid
      columns={{ xs: 1, sm: 2, md: 3 }}
      layout={hostListGridLayout}
      spacing="1em"
    />
  );
};

export default AnHostConfigInputGroup;