import { formatDistance, intlFormat } from "date-fns";
import { de, enUS, es, fr, ja, nl, pt, ptBR, ro, zhCN, zhTW } from "date-fns/locale";
import { TUserLocale } from "@formbricks/types/user";

export const convertDateString = (dateString: string | null) => {
  if (dateString === null) return null;
  if (!dateString) {
    return dateString;
  }

  const date = new Date(dateString);
  if (isNaN(date.getTime())) {
    return "Invalid Date";
  }
  return intlFormat(
    date,
    {
      year: "numeric",
      month: "short",
      day: "numeric",
    },
    {
      locale: "en",
    }
  );
};

export const convertDateTimeString = (dateString: string) => {
  if (!dateString) {
    return dateString;
  }
  const date = new Date(dateString);
  return intlFormat(
    date,
    {
      weekday: "long",
      year: "numeric",
      month: "long",
      day: "numeric",
      hour: "numeric",
      minute: "2-digit",
    },
    {
      locale: "en",
    }
  );
};

export const convertDateTimeStringShort = (dateString: string) => {
  if (!dateString) {
    return dateString;
  }
  const date = new Date(dateString);
  return intlFormat(
    date,
    {
      year: "numeric",
      month: "long",
      day: "numeric",
      hour: "numeric",
      minute: "2-digit",
    },
    {
      locale: "en",
    }
  );
};

export const convertTimeString = (dateString: string) => {
  const date = new Date(dateString);
  return intlFormat(
    date,
    {
      hour: "numeric",
      minute: "2-digit",
      second: "2-digit",
    },
    {
      locale: "en",
    }
  );
};

const getLocaleForTimeSince = (locale: TUserLocale) => {
  switch (locale) {
    case "de-DE":
      return de;
    case "en-US":
      return enUS;
    case "pt-BR":
      return ptBR;
    case "fr-FR":
      return fr;
    case "nl-NL":
      return nl;
    case "zh-Hant-TW":
      return zhTW;
    case "pt-PT":
      return pt;
    case "ro-RO":
      return ro;
    case "ja-JP":
      return ja;
    case "zh-Hans-CN":
      return zhCN;
    case "es-ES":
      return es;
  }
};

export const timeSince = (dateString: string, locale: TUserLocale) => {
  const date = new Date(dateString);
  return formatDistance(date, new Date(), {
    addSuffix: true,
    locale: getLocaleForTimeSince(locale),
  });
};

export const timeSinceDate = (date: Date) => {
  return formatDistance(date, new Date(), {
    addSuffix: true,
  });
};

export const formatDate = (date: Date) => {
  return intlFormat(date, {
    year: "numeric",
    month: "long",
    day: "numeric",
  });
};

export const getTodaysDateFormatted = (seperator: string) => {
  const date = new Date();
  const formattedDate = date.toISOString().split("T")[0].split("-").join(seperator);

  return formattedDate;
};

export const getTodaysDateTimeFormatted = (seperator: string) => {
  const date = new Date();
  const formattedDate = date.toISOString().split("T")[0].split("-").join(seperator);
  const formattedTime = date.toTimeString().split(" ")[0].split(":").join(seperator);

  return [formattedDate, formattedTime].join(seperator);
};

export const convertDatesInObject = <T>(obj: T): T => {
  if (obj === null || typeof obj !== "object") {
    return obj; // Return if obj is not an object
  }
  if (Array.isArray(obj)) {
    // Handle arrays by mapping each element through the function
    return obj.map((item) => convertDatesInObject(item)) as unknown as T;
  }
  const newObj: any = {};
  for (const key in obj) {
    if (
      (key === "createdAt" || key === "updatedAt") &&
      typeof obj[key] === "string" &&
      !isNaN(Date.parse(obj[key] as unknown as string))
    ) {
      newObj[key] = new Date(obj[key] as unknown as string);
    } else if (typeof obj[key] === "object" && obj[key] !== null) {
      newObj[key] = convertDatesInObject(obj[key]);
    } else {
      newObj[key] = obj[key];
    }
  }
  return newObj;
};