import { defineComponent } from "vue";
import { is12hFormat } from "@/units";
import { CURRENCY } from "../types/evcc";

const CURRENCY_SYMBOLS: Record<CURRENCY, string> = {
  AUD: "$",
  BGN: "лв",
  BRL: "R$",
  CAD: "$",
  CHF: "Fr.",
  CNY: "¥",
  EUR: "€",
  GBP: "£",
  ILS: "₪",
  NZD: "$",
  PLN: "zł",
  USD: "$",
  DKK: "kr",
  SEK: "kr",
};

// list of currencies where energy price should be displayed in subunits (factor 100)
const ENERGY_PRICE_IN_SUBUNIT: Record<CURRENCY, string> = {
  AUD: "c", // Australian cent
  BGN: "st", // Bulgarian stotinka
  BRL: "¢", // Brazilian centavo
  CAD: "¢", // Canadian cent
  CHF: "rp", // Swiss Rappen
  CNY: "f", // Chinese fen
  EUR: "ct", // Euro cent
  GBP: "p", // GB pence
  ILS: "ag", // Israeli agora
  NZD: "c", // New Zealand cent
  PLN: "gr", // Polish grosz
  USD: "¢", // US cent
  DKK: "øre", // Danish øre
  SEK: "öre", // Swedish öre
};

export enum POWER_UNIT {
  W = "W",
  KW = "kW",
  MW = "MW",
  AUTO = "",
}

export default defineComponent({
  data() {
    return {
      POWER_UNIT,
      fmtLimit: 100,
      fmtDigits: 1,
    };
  },
  methods: {
    round(num: number, precision: number) {
      const base = 10 ** precision;
      return (Math.round(num * base) / base).toFixed(precision);
    },
    fmtW(watt = 0, format = POWER_UNIT.KW, withUnit = true, digits?: number) {
      let unit = format;
      let d = digits;
      if (POWER_UNIT.AUTO === unit) {
        if (watt >= 10_000_000) {
          unit = POWER_UNIT.MW;
        } else if (watt >= 1000 || 0 === watt) {
          unit = POWER_UNIT.KW;
        } else {
          unit = POWER_UNIT.W;
        }
      }
      let value = watt;
      if (POWER_UNIT.KW === unit) {
        value = watt / 1000;
      } else if (POWER_UNIT.MW === unit) {
        value = watt / 1_000_000;
      }
      if (d === undefined) {
        d =
          POWER_UNIT.KW === unit || POWER_UNIT.MW === unit || (POWER_UNIT.W !== unit && 0 === watt)
            ? 1
            : 0;
      }
      return `${new Intl.NumberFormat(this.$i18n?.locale, {
        style: "decimal",
        minimumFractionDigits: d,
        maximumFractionDigits: d,
      }).format(value)}${withUnit ? ` ${unit}` : ""}`;
    },
    fmtWh(watt: number, format = POWER_UNIT.KW, withUnit = true, digits?: number) {
      return this.fmtW(watt, format, withUnit, digits) + (withUnit ? "h" : "");
    },
    fmtNumber(number: number, decimals: number | undefined, unit?: string) {
      const style = unit ? "unit" : "decimal";
      return new Intl.NumberFormat(this.$i18n?.locale, {
        style,
        unit,
        minimumFractionDigits: decimals,
        maximumFractionDigits: decimals,
      }).format(number);
    },
    fmtGrams(gramms: number, withUnit = true) {
      let unit = "gram";
      let value = gramms;
      if (gramms >= 1000) {
        unit = "kilogram";
        value = gramms / 1000;
      }
      return new Intl.NumberFormat(this.$i18n?.locale, {
        style: withUnit ? "unit" : "decimal",
        unit,
        minimumFractionDigits: 0,
        maximumFractionDigits: 0,
      }).format(value);
    },
    fmtCo2Short(gramms = 0) {
      return `${this.fmtNumber(gramms, 0)} g`;
    },
    fmtCo2Medium(gramms = 0) {
      return `${this.fmtNumber(gramms, 0)} g/kWh`;
    },
    fmtCo2Long(gramms = 0) {
      return `${this.fmtNumber(gramms, 0)} gCO₂e/kWh`;
    },
    fmtNumberToLocale(val: number, pad = 0) {
      return val.toLocaleString(this.$i18n?.locale).padStart(pad, "0");
    },
    fmtDurationToTime(date: Date) {
      const diff = date.getTime() - new Date().getTime();
      return this.fmtDuration(diff / 1000, true, "h");
    },
    fmtDurationNs(duration = 0, withUnit = true, minUnit = "s") {
      return this.fmtDuration(duration / 1e9, withUnit, minUnit);
    },
    fmtDuration(duration = 0, withUnit = true, minUnit = "s") {
      if (duration <= 0) {
        return "—";
      }
      const roundedDuration = Math.round(duration);
      const seconds = roundedDuration % 60;
      const minutes = Math.floor(roundedDuration / 60) % 60;
      const hours = Math.floor(roundedDuration / 3600);
      let result = "";
      let unit = "";
      if (hours >= 1 || minUnit === "h") {
        result = `${this.fmtNumberToLocale(hours)}:${this.fmtNumberToLocale(minutes, 2)}`;
        unit = "h";
      } else if (minutes >= 1 || minUnit === "m") {
        result = `${this.fmtNumberToLocale(minutes)}:${this.fmtNumberToLocale(seconds, 2)}`;
        unit = "m";
      } else {
        result = `${this.fmtNumberToLocale(seconds)}`;
        unit = "s";
      }
      if (withUnit) {
        result += `\u202F${unit}`;
      }
      return result;
    },
    fmtDurationLong(seconds: number, style: "short" | "long" = "long") {
      // @ts-expect-error - Intl.DurationFormat is a new API not yet in TS types, see https://github.com/microsoft/TypeScript/issues/60608
      if (!Intl.DurationFormat) {
        // old browser fallback
        return this.fmtDuration(seconds);
      }
      const hours = Math.floor(seconds / 3600);
      const minutes = Math.floor((seconds % 3600) / 60);

      // @ts-expect-error - Intl.DurationFormat is a new API not yet in TS types, see https://github.com/microsoft/TypeScript/issues/60608
      const formatter = new Intl.DurationFormat(this.$i18n?.locale, { style });
      return formatter.format({ minutes, hours });
    },
    fmtDayString(date: Date) {
      const YY = `${date.getFullYear()}`;
      const MM = `${date.getMonth() + 1}`.padStart(2, "0");
      const DD = `${date.getDate()}`.padStart(2, "0");
      return `${YY}-${MM}-${DD}`;
    },
    fmtTimeString(date: Date) {
      const HH = `${date.getHours()}`.padStart(2, "0");
      const mm = `${date.getMinutes()}`.padStart(2, "0");
      return `${HH}:${mm}`;
    },
    isToday(date: Date) {
      const today = new Date();
      return today.toDateString() === date.toDateString();
    },
    isTomorrow(date: Date) {
      const tomorrow = new Date();
      tomorrow.setDate(tomorrow.getDate() + 1);
      return tomorrow.toDateString() === date.toDateString();
    },
    weekdayPrefix(date: Date) {
      if (this.isToday(date)) {
        return "";
      }
      if (this.isTomorrow(date)) {
        try {
          const rtf = new Intl.RelativeTimeFormat(this.$i18n?.locale, {
            numeric: "auto",
          });
          const part = rtf.formatToParts(1, "day")[0];
          return part?.value || "";
        } catch (e) {
          console.warn("weekdayPrefix: Intl.RelativeTimeFormat not supported", e);
          return "tomorrow";
        }
      }
      return new Intl.DateTimeFormat(this.$i18n?.locale, {
        weekday: "short",
      }).format(date);
    },
    hourShort(date: Date) {
      const locale = this.$i18n?.locale;
      // special: use shorter german format
      if (locale === "de") return date.getHours();
      return new Intl.DateTimeFormat(locale, {
        hour: "numeric",
        hour12: is12hFormat(),
      }).format(date);
    },
    weekdayShort(date: Date) {
      return new Intl.DateTimeFormat(this.$i18n?.locale, {
        weekday: "short",
      }).format(date);
    },
    fmtAbsoluteDate(date: Date) {
      const weekday = this.weekdayPrefix(date);
      const hour = new Intl.DateTimeFormat(this.$i18n?.locale, {
        hour: "numeric",
        minute: "numeric",
        hour12: is12hFormat(),
      }).format(date);

      return `${weekday} ${hour}`.trim();
    },
    fmtHourMinute(date: Date) {
      return new Intl.DateTimeFormat(this.$i18n?.locale, {
        hour: "numeric",
        minute: "numeric",
        hour12: is12hFormat(),
      }).format(date);
    },
    fmtFullDateTime(date: Date, short: boolean) {
      return new Intl.DateTimeFormat(this.$i18n?.locale, {
        weekday: short ? undefined : "short",
        month: short ? "numeric" : "short",
        day: "numeric",
        hour: "numeric",
        minute: "numeric",
        hour12: is12hFormat(),
      }).format(date);
    },
    fmtWeekdayTime(date: Date) {
      return new Intl.DateTimeFormat(this.$i18n?.locale, {
        weekday: "short",
        hour: "numeric",
        minute: "numeric",
        hour12: is12hFormat(),
      }).format(date);
    },
    fmtMonthYear(date: Date) {
      return new Intl.DateTimeFormat(this.$i18n?.locale, {
        month: "long",
        year: "numeric",
      }).format(date);
    },
    fmtMonth(date: Date, short: boolean) {
      return new Intl.DateTimeFormat(this.$i18n?.locale, {
        month: short ? "short" : "long",
      }).format(date);
    },
    fmtDayMonth(date: Date) {
      return new Intl.DateTimeFormat(this.$i18n?.locale, {
        weekday: "short",
        day: "numeric",
        month: "short",
      }).format(date);
    },
    fmtDurationUnit(value: number, unit = "second") {
      return new Intl.NumberFormat(this.$i18n?.locale, {
        style: "unit",
        unit,
        unitDisplay: "long",
      })
        .formatToParts(value)
        .find((part) => part.type === "unit")?.value;
    },
    fmtMoney(amout = 0, currency = CURRENCY.EUR, decimals = true, withSymbol = false) {
      const currencyDisplay = withSymbol ? "narrowSymbol" : "code";
      const digits = decimals ? undefined : 0;
      const result = new Intl.NumberFormat(this.$i18n?.locale, {
        style: "currency",
        currency,
        currencyDisplay,
        minimumFractionDigits: digits,
        maximumFractionDigits: digits,
      }).format(amout);

      return withSymbol ? result : result.replace(currency, "").trim();
    },
    fmtCurrencySymbol(currency = CURRENCY.EUR) {
      return CURRENCY_SYMBOLS[currency] || currency;
    },
    fmtPricePerKWh(amout = 0, currency = CURRENCY.EUR, short = false, withUnit = true) {
      let value = amout;
      let minimumFractionDigits = 1;
      let maximumFractionDigits = 3;
      if (ENERGY_PRICE_IN_SUBUNIT[currency]) {
        value *= 100;
        minimumFractionDigits = 1;
        maximumFractionDigits = 1;
      }
      const price = new Intl.NumberFormat(this.$i18n?.locale, {
        style: "decimal",
        minimumFractionDigits,
        maximumFractionDigits,
      }).format(value);
      if (withUnit) {
        return `${price} ${this.pricePerKWhUnit(currency, short)}`;
      }
      return price;
    },
    timezone() {
      return Intl?.DateTimeFormat?.().resolvedOptions?.().timeZone || "UTC";
    },
    pricePerKWhUnit(currency = CURRENCY.EUR, short = false) {
      const unit = ENERGY_PRICE_IN_SUBUNIT[currency] || currency;
      return `${unit}${short ? "" : "/kWh"}`;
    },
    fmtTimeAgo(elapsed: number) {
      const units = {
        day: 24 * 60 * 60 * 1000,
        hour: 60 * 60 * 1000,
        minute: 60 * 1000,
        second: 1000,
      };

      // "Math.abs" accounts for both "past" & "future" scenarios
      for (const u in units) {
        const unitKey = u as keyof typeof units;
        if (Math.abs(elapsed) > units[unitKey] || u == "second") {
          try {
            const rtf = new Intl.RelativeTimeFormat(this.$i18n?.locale, {
              numeric: "auto",
            });
            return rtf.format(Math.round(elapsed / units[unitKey]), unitKey);
          } catch (e) {
            console.warn("fmtTimeAgo: Intl.RelativeTimeFormat not supported", e);
            return `${elapsed} ${u}s ago`;
          }
        }
      }

      return "";
    },
    fmtSocOption(soc: number, rangePerSoc?: number, distanceUnit?: string, heating?: boolean) {
      let result = heating ? this.fmtTemperature(soc) : `${this.fmtPercentage(soc)}`;
      if (rangePerSoc && distanceUnit) {
        const range = soc * rangePerSoc;
        result += ` (${this.fmtNumber(range, 0)} ${distanceUnit})`;
      }
      return result;
    },
    fmtPercentage(value: number, digits = 0, forceSign = false) {
      const sign = forceSign && value > 0 ? "+" : "";
      return `${sign}${new Intl.NumberFormat(this.$i18n?.locale, {
        style: "percent",
        minimumFractionDigits: digits,
        maximumFractionDigits: digits,
      }).format(value / 100)}`;
    },
    hasLeadingPercentageSign() {
      return ["tr", "ar"].includes(this.$i18n?.locale);
    },
    fmtTemperature(value: number) {
      // TODO: handle fahrenheit
      return this.fmtNumber(value, 1, "celsius");
    },
    getWeekdaysList(
      weekdayFormat: Intl.DateTimeFormatOptions["weekday"]
    ): { name: string; value: number }[] {
      const { format } = new Intl.DateTimeFormat(this.$i18n?.locale, {
        weekday: weekdayFormat,
      });
      const mondayToSaturday = [7, 8, 9, 10, 11, 12].map((day, index) => {
        return { name: format(new Date(Date.UTC(2021, 5, day))), value: index + 1 };
      });
      const sunday = { name: format(new Date(Date.UTC(2021, 5, 6))), value: 0 };
      return [...mondayToSaturday, sunday];
    },
    getShortenedWeekdaysLabel(selectedWeekdays: number[]): string {
      if (0 === selectedWeekdays.length) {
        return "–";
      }

      const weekdays = this.getWeekdaysList("short");
      let label = "";

      // the week in the input-parameter starts with 0 for sunday and ends with 6 for saturday
      // this algorithms works only if the week starts with 1 for monday and ends with 7 for sunday because
      // then we are able to count from 1 to 7 by incrementing the number
      // so we have to transform the input accordingly
      const selectedWeekdaysTransformed = selectedWeekdays.map(function (dayIndex) {
        return 0 === dayIndex ? 7 : dayIndex;
      });
      function getWeekdayName(dayIndex: number) {
        return weekdays.find((day) => day.value === (7 === dayIndex ? 0 : dayIndex))?.name;
      }

      const maxWeekday = Math.max(...selectedWeekdaysTransformed);

      for (let weekdayRangeStart = 1; weekdayRangeStart < 8; weekdayRangeStart++) {
        if (selectedWeekdaysTransformed.includes(weekdayRangeStart)) {
          label += getWeekdayName(weekdayRangeStart);

          let weekdayRangeEnd = weekdayRangeStart;
          while (selectedWeekdaysTransformed.includes(weekdayRangeEnd + 1)) {
            weekdayRangeEnd++;
          }

          if (weekdayRangeEnd - weekdayRangeStart > 1) {
            // more than 2 consecutive weekdays selected
            label += " – " + getWeekdayName(weekdayRangeEnd);
            weekdayRangeStart = weekdayRangeEnd;
            if (maxWeekday !== weekdayRangeEnd) {
              label += ", ";
            }
          } else if (weekdayRangeStart !== weekdayRangeEnd) {
            // exactly 2 consecutive weekdays selected
            label += ", ";
          } else {
            // exactly 1 single day selected
            if (maxWeekday !== weekdayRangeEnd) {
              label += ", ";
            }
          }
        }
      }
      return label;
    },
  },
});