ghostfolio/libs/common/src/lib/helper.ts

import * as currencies from '@dinero.js/currencies';
import { DataSource, MarketData } from '@prisma/client';
import Big from 'big.js';
import {
  getDate,
  getMonth,
  getYear,
  isMatch,
  parse,
  parseISO,
  subDays
} from 'date-fns';
import { de, es, fr, it, nl, pl, pt, tr } from 'date-fns/locale';

import { ghostfolioScraperApiSymbolPrefix, locale } from './config';
import { Benchmark, UniqueAsset } from './interfaces';
import { BenchmarkTrend, ColorScheme } from './types';

export const DATE_FORMAT = 'yyyy-MM-dd';
export const DATE_FORMAT_MONTHLY = 'MMMM yyyy';
export const DATE_FORMAT_YEARLY = 'yyyy';

const NUMERIC_REGEXP = /[-]{0,1}[\d]*[.,]{0,1}[\d]+/g;

export function calculateBenchmarkTrend({
  days,
  historicalData
}: {
  days: number;
  historicalData: MarketData[];
}): BenchmarkTrend {
  const hasEnoughData = historicalData.length >= 2 * days;

  if (!hasEnoughData) {
    return 'UNKNOWN';
  }

  const recentPeriodAverage = calculateMovingAverage({
    days,
    prices: historicalData.slice(0, days).map(({ marketPrice }) => {
      return new Big(marketPrice);
    })
  });

  const pastPeriodAverage = calculateMovingAverage({
    days,
    prices: historicalData.slice(days, 2 * days).map(({ marketPrice }) => {
      return new Big(marketPrice);
    })
  });

  if (recentPeriodAverage > pastPeriodAverage) {
    return 'UP';
  }

  if (recentPeriodAverage < pastPeriodAverage) {
    return 'DOWN';
  }

  return 'NEUTRAL';
}

export function calculateMovingAverage({
  days,
  prices
}: {
  days: number;
  prices: Big[];
}) {
  return prices
    .reduce((previous, current) => {
      return previous.add(current);
    }, new Big(0))
    .div(days)
    .toNumber();
}

export function capitalize(aString: string) {
  return aString.charAt(0).toUpperCase() + aString.slice(1).toLowerCase();
}

export function decodeDataSource(encodedDataSource: string) {
  if (encodedDataSource) {
    return Buffer.from(encodedDataSource, 'hex').toString();
  }

  return undefined;
}

export function downloadAsFile({
  content,
  contentType = 'text/plain',
  fileName,
  format
}: {
  content: unknown;
  contentType?: string;
  fileName: string;
  format: 'json' | 'string';
}) {
  const a = document.createElement('a');

  if (format === 'json') {
    content = JSON.stringify(content, undefined, '  ');
  }

  const file = new Blob([<string>content], {
    type: contentType
  });
  a.href = URL.createObjectURL(file);
  a.download = fileName;
  a.click();
}

export function encodeDataSource(aDataSource: DataSource) {
  if (aDataSource) {
    return Buffer.from(aDataSource, 'utf-8').toString('hex');
  }

  return undefined;
}

export function extractNumberFromString(aString: string): number {
  try {
    const [numberString] = aString.match(NUMERIC_REGEXP);
    return parseFloat(numberString.trim());
  } catch {
    return undefined;
  }
}

export function getAssetProfileIdentifier({ dataSource, symbol }: UniqueAsset) {
  return `${dataSource}-${symbol}`;
}

export function getBackgroundColor(aColorScheme: ColorScheme) {
  return getCssVariable(
    aColorScheme === 'DARK' ||
      window.matchMedia('(prefers-color-scheme: dark)').matches
      ? '--dark-background'
      : '--light-background'
  );
}

export function getCssVariable(aCssVariable: string) {
  return getComputedStyle(document.documentElement).getPropertyValue(
    aCssVariable
  );
}

export function getDateFnsLocale(aLanguageCode: string) {
  if (aLanguageCode === 'de') {
    return de;
  } else if (aLanguageCode === 'es') {
    return es;
  } else if (aLanguageCode === 'fr') {
    return fr;
  } else if (aLanguageCode === 'it') {
    return it;
  } else if (aLanguageCode === 'nl') {
    return nl;
  } else if (aLanguageCode === 'pl') {
    return pl;
  } else if (aLanguageCode === 'pt') {
    return pt;
  } else if (aLanguageCode === 'tr') {
    return tr;
  }

  return undefined;
}

export function getDateFormatString(aLocale?: string) {
  const formatObject = new Intl.DateTimeFormat(aLocale).formatToParts(
    new Date()
  );

  return formatObject
    .map((object) => {
      switch (object.type) {
        case 'day':
          return 'dd';
        case 'month':
          return 'MM';
        case 'year':
          return 'yyyy';
        default:
          return object.value;
      }
    })
    .join('');
}

export function getDateWithTimeFormatString(aLocale?: string) {
  return `${getDateFormatString(aLocale)}, HH:mm:ss`;
}

export function getEmojiFlag(aCountryCode: string) {
  if (!aCountryCode) {
    return aCountryCode;
  }

  return aCountryCode
    .toUpperCase()
    .replace(/./g, (character) =>
      String.fromCodePoint(127397 + character.charCodeAt(0))
    );
}

export function getLocale() {
  return navigator.languages?.length
    ? navigator.languages[0]
    : navigator.language ?? locale;
}

export function getNumberFormatDecimal(aLocale?: string) {
  const formatObject = new Intl.NumberFormat(aLocale).formatToParts(9999.99);

  return formatObject.find((object) => {
    return object.type === 'decimal';
  }).value;
}

export function getNumberFormatGroup(aLocale?: string) {
  const formatObject = new Intl.NumberFormat(aLocale).formatToParts(9999.99);

  return formatObject.find((object) => {
    return object.type === 'group';
  }).value;
}

export function getStartOfUtcDate(aDate: Date) {
  const date = new Date(aDate);
  date.setUTCHours(0, 0, 0, 0);

  return date;
}

export function getSum(aArray: Big[]) {
  if (aArray?.length > 0) {
    return aArray.reduce((a, b) => a.plus(b), new Big(0));
  }

  return new Big(0);
}

export function getTextColor(aColorScheme: ColorScheme) {
  const cssVariable = getCssVariable(
    aColorScheme === 'DARK' ||
      window.matchMedia('(prefers-color-scheme: dark)').matches
      ? '--light-primary-text'
      : '--dark-primary-text'
  );

  const [r, g, b] = cssVariable.split(',');

  return `${r}, ${g}, ${b}`;
}

export function getToday() {
  const year = getYear(new Date());
  const month = getMonth(new Date());
  const day = getDate(new Date());

  return new Date(Date.UTC(year, month, day));
}

export function getUtc(aDateString: string) {
  const [yearString, monthString, dayString] = aDateString.split('-');

  return new Date(
    Date.UTC(
      parseInt(yearString, 10),
      parseInt(monthString, 10) - 1,
      parseInt(dayString, 10)
    )
  );
}

export function getYesterday() {
  const year = getYear(new Date());
  const month = getMonth(new Date());
  const day = getDate(new Date());

  return subDays(new Date(Date.UTC(year, month, day)), 1);
}

export function groupBy<T, K extends keyof T>(
  key: K,
  arr: T[]
): Map<T[K], T[]> {
  const map = new Map<T[K], T[]>();
  arr.forEach((t) => {
    if (!map.has(t[key])) {
      map.set(t[key], []);
    }
    map.get(t[key])!.push(t);
  });
  return map;
}

export function interpolate(template: string, context: any) {
  return template?.replace(/[$]{([^}]+)}/g, (_, objectPath) => {
    const properties = objectPath.split('.');
    return properties.reduce(
      (previous, current) => previous?.[current],
      context
    );
  });
}

export function isCurrency(aSymbol = '') {
  return currencies[aSymbol];
}

export function parseDate(date: string): Date | null {
  // Transform 'yyyyMMdd' format to supported format by parse function
  if (date?.length === 8) {
    const match = date.match(/^(\d{4})(\d{2})(\d{2})$/);

    if (match) {
      const [, year, month, day] = match;
      date = `${year}-${month}-${day}`;
    }
  }

  const dateFormat = [
    'dd-MM-yyyy',
    'dd/MM/yyyy',
    'dd.MM.yyyy',
    'yyyy-MM-dd',
    'yyyy/MM/dd',
    'yyyy.MM.dd',
    'yyyyMMdd'
  ].find((format) => {
    return isMatch(date, format) && format.length === date.length;
  });

  if (dateFormat) {
    return parse(date, dateFormat, new Date());
  }

  return parseISO(date);
}

export function parseSymbol({ dataSource, symbol }: UniqueAsset) {
  const [ticker, exchange] = symbol.split('.');

  return {
    ticker,
    exchange: exchange ?? (dataSource === 'YAHOO' ? 'US' : undefined)
  };
}

export function prettifySymbol(aSymbol: string): string {
  return aSymbol?.replace(ghostfolioScraperApiSymbolPrefix, '');
}

export function resetHours(aDate: Date) {
  const year = getYear(aDate);
  const month = getMonth(aDate);
  const day = getDate(aDate);

  return new Date(Date.UTC(year, month, day));
}

export function resolveFearAndGreedIndex(aValue: number) {
  if (aValue <= 25) {
    return { emoji: '🥵', key: 'EXTREME_FEAR', text: 'Extreme Fear' };
  } else if (aValue <= 45) {
    return { emoji: '😨', key: 'FEAR', text: 'Fear' };
  } else if (aValue <= 55) {
    return { emoji: '😐', key: 'NEUTRAL', text: 'Neutral' };
  } else if (aValue < 75) {
    return { emoji: '😜', key: 'GREED', text: 'Greed' };
  } else {
    return { emoji: '🤪', key: 'EXTREME_GREED', text: 'Extreme Greed' };
  }
}

export function resolveMarketCondition(
  aMarketCondition: Benchmark['marketCondition']
) {
  if (aMarketCondition === 'ALL_TIME_HIGH') {
    return { emoji: '🎉' };
  } else if (aMarketCondition === 'BEAR_MARKET') {
    return { emoji: '🐻' };
  } else {
    return { emoji: '⚪' };
  }
}