import _has from 'lodash/has';
import _isNil from 'lodash/isNil';
import _lowerCase from 'lodash/lowerCase';
import _startCase from 'lodash/startCase';
import { format as d3Format } from 'd3-format';

/*
* Display grid constants
*/
export const baseWidth = 8; // design base width of 8px
export const rowGutter = 3 * baseWidth;

/*
* Number formatters
*/
const successRateFormatter = d3Format('.2%');
const commaFormatter = d3Format(',');
const secondsFormatter = d3Format(',.3s');

export const formatWithComma = m => {
  if (_isNil(m)) {
    return '---';
  } else {
    return commaFormatter(m);
  }
};

const niceLatency = l => commaFormatter(Math.round(l));

export const formatLatencySec = latency => {
  const s = parseFloat(latency);
  if (_isNil(s)) {
    return '---';
  } else if (s === parseFloat(0.0)) {
    return '0 s';
  } else if (s < 0.001) {
    return `${niceLatency(s * 1000 * 1000)} µs`;
  } else if (s < 1.0) {
    return `${niceLatency(s * 1000)} ms`;
  } else {
    return `${secondsFormatter(s)} s`;
  }
};

export const formatLatencyMs = m => {
  if (_isNil(m)) {
    return '---';
  } else {
    return `${formatLatencySec(m / 1000)}`;
  }
};

/*
* Add commas to a number (converting it to a string in the process)
*/
export function addCommas(nStr) {
  let nStr_ = nStr;
  nStr_ += '';
  const x = nStr_.split('.');
  let x1 = x[0];
  const x2 = x.length > 1 ? `.${x[1]}` : '';
  const rgx = /(\d+)(\d{3})/;
  while (rgx.test(x1)) {
    x1 = x1.replace(rgx, '$1,$2');
  }
  return x1 + x2;
}

/*
* Round a number to a given number of decimals
*/
export const roundNumber = (num, dec) => {
  return Math.round(num * 10 ** dec) / 10 ** dec;
};

/*
* Shorten and style number
*/
export const styleNum = (number, unit = '', truncate = true) => {
  let number_ = number;
  if (Number.isNaN(number_)) {
    return 'N/A';
  }

  if (truncate && number_ > 999999999) {
    number_ = roundNumber(number_ / 1000000000.0, 3);
    return `${addCommas(number_)}G${unit}`;
  } else if (truncate && number_ > 999999) {
    number_ = roundNumber(number_ / 1000000.0, 3);
    return `${addCommas(number_)}M${unit}`;
  } else if (truncate && number_ > 999) {
    number_ = roundNumber(number_ / 1000.0, 3);
    return `${addCommas(number_)}k${unit}`;
  } else if (number_ > 999) {
    number_ = roundNumber(number_, 0);
    return addCommas(number_) + unit;
  } else {
    number_ = roundNumber(number_, 2);
    return addCommas(number_) + unit;
  }
};

export const metricToFormatter = {
  REQUEST_RATE: m => _isNil(m) ? '---' : styleNum(m, ' RPS', true),
  SUCCESS_RATE: m => _isNil(m) ? '---' : successRateFormatter(m),
  LATENCY: formatLatencyMs,
  UNTRUNCATED: m => styleNum(m, '', false),
  BYTES: m => _isNil(m) ? '---' : styleNum(m, 'B/s', true),
  NO_UNIT: m => _isNil(m) ? '---' : styleNum(m, '', true),
};

/*
* Convert a string to a valid css class name
*/
export const toClassName = name => {
  if (!name) { return ''; }
  return _lowerCase(name).replace(/[^a-zA-Z0-9]/g, '_');
};

/*
 Create regex string from user input for a filter
*/
export const regexFilterString = input => {
  // make input lower case and strip out unwanted characters
  const input_ = input.replace(/[^A-Z0-9/.\-_*]/gi, '').toLowerCase();
  // replace "*" in input with wildcard
  return new RegExp(input_.replace(/[*]/g, '.+'));
};

/*
  Get a singular resource name from a plural resource
*/
export const singularResource = resource => {
  if (resource === 'authorities') {
    return 'authority';
  } else { return resource.replace(/s$/, ''); }
};

/*
  Nicely readable names for the stat resources
*/
export const friendlyTitle = singularOrPluralResource => {
  const resource = singularResource(singularOrPluralResource);
  let titleCase = _startCase(resource);
  if (resource === 'replicationcontroller') {
    titleCase = _startCase('replication controller');
  } else if (resource === 'daemonset') {
    titleCase = _startCase('daemon set');
  } else if (resource === 'statefulset') {
    titleCase = _startCase('stateful set');
  } else if (resource === 'trafficsplit') {
    titleCase = _startCase('traffic split');
  } else if (resource === 'cronjob') {
    titleCase = _startCase('cron job');
  } else if (resource === 'replicaset') {
    titleCase = _startCase('replica set');
  }

  const titles = { singular: titleCase };
  if (resource === 'authority') {
    titles.plural = 'Authorities';
  } else {
    titles.plural = `${titles.singular}s`;
  }
  return titles;
};

/*
  Get the resource type from the /pods response, whose json
  is camelCased.
*/
const camelCaseLookUp = {
  replicaset: 'replicaSet',
  replicationcontroller: 'replicationController',
  statefulset: 'statefulSet',
  trafficsplit: 'trafficSplit',
  daemonset: 'daemonSet',
  cronjob: 'cronJob',
};

export const resourceTypeToCamelCase = resource => camelCaseLookUp[resource] || resource;

/*
  A simplified version of ShortNameFromCanonicalResourceName
*/
export const shortNameLookup = {
  deployment: 'deploy',
  daemonset: 'ds',
  namespace: 'ns',
  pod: 'po',
  replicationcontroller: 'rc',
  replicaset: 'rs',
  service: 'svc',
  statefulset: 'sts',
  trafficsplit: 'ts',
  job: 'job',
  authority: 'au',
  cronjob: 'cj',
};

export const podOwnerLookup = {
  deployment: 'deploy',
  daemonset: 'ds',
  replicationcontroller: 'rc',
  replicaset: 'rs',
  statefulset: 'sts',
  cronjob: 'cj',
};

export const toShortResourceName = name => shortNameLookup[name] || name;

export const displayName = resource => `${toShortResourceName(resource.type)}/${resource.name}`;

export const isResource = name => {
  const singularResourceName = singularResource(name);
  return _has(shortNameLookup, singularResourceName);
};

/*
  produce octets given an ip address
*/
const decodeIPToOctets = ip => {
  const ip_ = parseInt(ip, 10);
  return [
    (ip_ >> 24) & 255,
    (ip_ >> 16) & 255,
    (ip_ >> 8) & 255,
    ip_ & 255,
  ];
};

/*
  converts an address to an ipv4 formatted host:port pair
*/
export const publicAddressToString = (ipv4, port) => {
  const octets = decodeIPToOctets(ipv4);
  return `${octets.join('.')}:${port}`;
};

export const getSrClassification = sr => {
  if (sr < 0.9) {
    return 'status-poor';
  } else if (sr < 0.95) {
    return 'status-ok';
  } else { return 'status-good'; }
};