import {
  DecimalCount,
  deprecationWarning,
  formattedValueToString,
  getValueFormat,
  getValueFormats,
  getValueFormatterIndex,
  stringToJsRegex,
  TimeRange,
  ValueFormatterIndex,
} from '@grafana/data';
import { has } from 'lodash';

const kbn = {
  valueFormats: {} as ValueFormatterIndex,
  intervalRegex: /(\d+(?:\.\d+)?)(ms|[Mwdhmsy])/,
  intervalsInSeconds: {
    y: 31536000,
    M: 2592000,
    w: 604800,
    d: 86400,
    h: 3600,
    m: 60,
    s: 1,
    ms: 0.001,
  } as { [index: string]: number },
  regexEscape: (value: string) => value.replace(/[\\^$*+?.()|[\]{}\/]/g, '\\$&'),
  roundInterval: (interval: number) => {
    switch (true) {
      // 0.015s
      case interval < 15:
        return 10; // 0.01s
      // 0.035s
      case interval < 35:
        return 20; // 0.02s
      // 0.075s
      case interval < 75:
        return 50; // 0.05s
      // 0.15s
      case interval < 150:
        return 100; // 0.1s
      // 0.35s
      case interval < 350:
        return 200; // 0.2s
      // 0.75s
      case interval < 750:
        return 500; // 0.5s
      // 1.5s
      case interval < 1500:
        return 1000; // 1s
      // 3.5s
      case interval < 3500:
        return 2000; // 2s
      // 7.5s
      case interval < 7500:
        return 5000; // 5s
      // 12.5s
      case interval < 12500:
        return 10000; // 10s
      // 17.5s
      case interval < 17500:
        return 15000; // 15s
      // 25s
      case interval < 25000:
        return 20000; // 20s
      // 45s
      case interval < 45000:
        return 30000; // 30s
      // 1.5m
      case interval < 90000:
        return 60000; // 1m
      // 3.5m
      case interval < 210000:
        return 120000; // 2m
      // 7.5m
      case interval < 450000:
        return 300000; // 5m
      // 12.5m
      case interval < 750000:
        return 600000; // 10m
      // 12.5m
      case interval < 1050000:
        return 900000; // 15m
      // 25m
      case interval < 1500000:
        return 1200000; // 20m
      // 45m
      case interval < 2700000:
        return 1800000; // 30m
      // 1.5h
      case interval < 5400000:
        return 3600000; // 1h
      // 2.5h
      case interval < 9000000:
        return 7200000; // 2h
      // 4.5h
      case interval < 16200000:
        return 10800000; // 3h
      // 9h
      case interval < 32400000:
        return 21600000; // 6h
      // 1d
      case interval < 86400000:
        return 43200000; // 12h
      // 1w
      case interval < 604800000:
        return 86400000; // 1d
      // 3w
      case interval < 1814400000:
        return 604800000; // 1w
      // 6w
      case interval < 3628800000:
        return 2592000000; // 30d
      default:
        return 31536000000; // 1y
    }
  },
  secondsToHms: (seconds: number) => {
    const numYears = Math.floor(seconds / 31536000);
    if (numYears) {
      return numYears + 'y';
    }
    const numDays = Math.floor((seconds % 31536000) / 86400);
    if (numDays) {
      return numDays + 'd';
    }
    const numHours = Math.floor(((seconds % 31536000) % 86400) / 3600);
    if (numHours) {
      return numHours + 'h';
    }
    const numMinutes = Math.floor((((seconds % 31536000) % 86400) % 3600) / 60);
    if (numMinutes) {
      return numMinutes + 'm';
    }
    const numSeconds = Math.floor((((seconds % 31536000) % 86400) % 3600) % 60);
    if (numSeconds) {
      return numSeconds + 's';
    }
    const numMilliseconds = Math.floor(seconds * 1000.0);
    if (numMilliseconds) {
      return numMilliseconds + 'ms';
    }

    return 'less than a millisecond'; //'just now' //or other string you like;
  },
  secondsToHhmmss: (seconds: number) => {
    const strings: string[] = [];
    const numHours = Math.floor(seconds / 3600);
    const numMinutes = Math.floor((seconds % 3600) / 60);
    const numSeconds = Math.floor((seconds % 3600) % 60);
    numHours > 9 ? strings.push('' + numHours) : strings.push('0' + numHours);
    numMinutes > 9 ? strings.push('' + numMinutes) : strings.push('0' + numMinutes);
    numSeconds > 9 ? strings.push('' + numSeconds) : strings.push('0' + numSeconds);
    return strings.join(':');
  },
  toPercent: (nr: number, outOf: number) => Math.floor((nr / outOf) * 10000) / 100 + '%',
  addSlashes: (str: string) => {
    str = str.replace(/\\/g, '\\\\');
    str = str.replace(/\'/g, "\\'");
    str = str.replace(/\"/g, '\\"');
    str = str.replace(/\0/g, '\\0');
    return str;
  },
  describeInterval: (str: string) => {
    // Default to seconds if no unit is provided
    if (Number(str)) {
      return {
        sec: kbn.intervalsInSeconds.s,
        type: 's',
        count: parseInt(str, 10),
      };
    }

    const matches = str.match(kbn.intervalRegex);
    if (!matches || !has(kbn.intervalsInSeconds, matches[2])) {
      throw new Error(
        `Invalid interval string, has to be either unit-less or end with one of the following units: "${Object.keys(
          kbn.intervalsInSeconds
        ).join(', ')}"`
      );
    } else {
      return {
        sec: kbn.intervalsInSeconds[matches[2]],
        type: matches[2],
        count: parseInt(matches[1], 10),
      };
    }
  },
  intervalToSeconds: (str: string): number => {
    const info = kbn.describeInterval(str);
    return info.sec * info.count;
  },
  intervalToMs: (str: string) => {
    const info = kbn.describeInterval(str);
    return info.sec * 1000 * info.count;
  },
  calculateInterval: (range: TimeRange, resolution: number, lowLimitInterval?: string) => {
    let lowLimitMs = 1; // 1 millisecond default low limit
    let intervalMs;

    if (lowLimitInterval) {
      if (lowLimitInterval[0] === '>') {
        lowLimitInterval = lowLimitInterval.slice(1);
      }
      lowLimitMs = kbn.intervalToMs(lowLimitInterval);
    }

    intervalMs = kbn.roundInterval((range.to.valueOf() - range.from.valueOf()) / resolution);
    if (lowLimitMs > intervalMs) {
      intervalMs = lowLimitMs;
    }

    return {
      intervalMs: intervalMs,
      interval: kbn.secondsToHms(intervalMs / 1000),
    };
  },
  queryColorDot: (color: string, diameter: string) => {
    return (
      '<div class="icon-circle" style="' +
      ['display:inline-block', 'color:' + color, 'font-size:' + diameter + 'px'].join(';') +
      '"></div>'
    );
  },
  slugifyForUrl: (str: string) => {
    return str
      .toLowerCase()
      .replace(/[^\w ]+/g, '')
      .replace(/ +/g, '-');
  },
  /** deprecated since 6.1, use grafana/data */
  stringToJsRegex: (str: string) => {
    deprecationWarning('kbn.ts', 'kbn.stringToJsRegex()', '@grafana/data');
    return stringToJsRegex(str);
  },
  toFixed: (value: number | null, decimals: number) => {
    if (value === null) {
      return '';
    }

    const factor = decimals ? Math.pow(10, Math.max(0, decimals)) : 1;
    const formatted = String(Math.round(value * factor) / factor);

    // if exponent return directly
    if (formatted.indexOf('e') !== -1 || value === 0) {
      return formatted;
    }

    // If tickDecimals was specified, ensure that we have exactly that
    // much precision; otherwise default to the value's own precision.
    if (decimals != null) {
      const decimalPos = formatted.indexOf('.');
      const precision = decimalPos === -1 ? 0 : formatted.length - decimalPos - 1;
      if (precision < decimals) {
        return (precision ? formatted : formatted + '.') + String(factor).substr(1, decimals - precision);
      }
    }

    return formatted;
  },
  toFixedScaled: (
    value: number,
    decimals: number,
    scaledDecimals: number | null,
    additionalDecimals: number,
    ext: number
  ) => {
    if (scaledDecimals === null) {
      return kbn.toFixed(value, decimals) + ext;
    } else {
      return kbn.toFixed(value, scaledDecimals + additionalDecimals) + ext;
    }
  },
  roundValue: (num: number, decimals: number) => {
    if (num === null) {
      return null;
    }
    const n = Math.pow(10, decimals);
    const formatted = (n * num).toFixed(decimals);
    return Math.round(parseFloat(formatted)) / n;
  },
  // FORMAT MENU
  getUnitFormats: getValueFormats,
};

/**
 * Backward compatible layer for value formats to support old plugins
 */
if (typeof Proxy !== 'undefined') {
  kbn.valueFormats = new Proxy(kbn.valueFormats, {
    get(target, name, receiver) {
      if (typeof name !== 'string') {
        throw { message: `Value format ${String(name)} is not a string` };
      }

      const formatter = getValueFormat(name);
      if (formatter) {
        // Return the results as a simple string
        return (value: number, decimals?: DecimalCount, scaledDecimals?: DecimalCount, isUtc?: boolean) => {
          return formattedValueToString(formatter(value, decimals, scaledDecimals, isUtc ? 'utc' : 'browser'));
        };
      }

      // default to look here
      return Reflect.get(target, name, receiver);
    },
  });
} else {
  kbn.valueFormats = getValueFormatterIndex();
}

export default kbn;