import dayjs from "dayjs";
import utc from "dayjs/plugin/utc.js";
import hashTwt from "./hashTwt.js";
import { getValueOrFirstEntry } from "./utils.js";
dayjs.extend(utc);
function parseTwtxt(twtxt) {
  const allLines = twtxt.split("\n");
  const { commentLines = [], contentLines = [] } = allLines.reduce(
    (acc, originalLine) => {
      const line = originalLine.trim();
      if (line === "") return acc;
      if (line.startsWith("#")) acc.commentLines.push(line);
      else acc.contentLines.push(line);
      return acc;
    },
    {
      commentLines: [],
      contentLines: []
    }
  );
  const { following = [], metadata = {} } = commentLines.filter((line) => line.includes("=")).reduce(
    (acc, line) => {
      const [key, ...vals] = line.substring(1).split("=").map((field) => field.trim());
      const val = vals.join("=");
      if (key === "follow") {
        const [nick, url] = val.trim().split(/\s+/);
        acc.following.push({ nick, url });
      } else {
        if (acc.metadata[key]) {
          if (!Array.isArray(acc.metadata[key]))
            acc.metadata[key] = [acc.metadata[key], val];
          else acc.metadata[key].push(val);
        } else acc.metadata[key] = val;
      }
      return acc;
    },
    {
      following: [],
      metadata: {}
    }
  );
  const replyRegEx = /\(#([\w]+)\) (\<\@(\S+) ([^>]+)>)*/;
  const twts = contentLines.map((line) => {
    const [created, content] = line.split(/\t/).map((val) => val.trim());
    if (typeof content === "undefined")
      throw new Error(`Content is undefined: ${line}`);
    const createdDayjs = dayjs.utc(created);
    if (!createdDayjs.isValid())
      throw new Error(`Date is invalid: ${line}`);
    const createdUTC = createdDayjs.toISOString();
    const replyMatches = replyRegEx.exec(content);
    let replyHash, replyNick, replyUrl;
    if (replyMatches?.length) {
      replyHash = replyMatches?.[1];
      replyNick = replyMatches?.[3];
      replyUrl = replyMatches?.[4];
    }
    const hash = hashTwt({
      content,
      created,
      createdUTC,
      url: getValueOrFirstEntry(metadata?.url ?? "")
    });
    return {
      content,
      created,
      createdUTC,
      hash,
      replyHash,
      replyNick,
      replyUrl
    };
  }).sort((a, b) => dayjs(a.created).diff(dayjs(b.created)));
  return {
    following,
    metadata,
    twts
  };
}
export {
  parseTwtxt as default
};
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