"use strict";

const md = require("ssb-markdown");
const ssbMessages = require("ssb-msgs");
const ssbRef = require("ssb-ref");

const toUrl = (mentions = []) => {
  const mentionNames = {};

  ssbMessages.links(mentions, "feed").forEach(link => {
    if (link.name && typeof link.name === "string") {
      const name = link.name.charAt(0) === "@" ? link.name : `@${link.name}`;
      mentionNames[name] = link.link;
    }
  });

  return ref => {
    // @mentions
    if (ref in mentionNames) {
      return `/author/${encodeURIComponent(mentionNames[ref])}`;
    }

    if (ssbRef.isFeedId(ref)) {
      return `/author/${encodeURIComponent(ref)}`;
    }
    if (ssbRef.isMsgId(ref)) {
      return `/thread/${encodeURIComponent(ref)}`;
    }
    if (ssbRef.isBlobId(ref)) {
      return `/blob/${encodeURIComponent(ref)}`;
    }
    if (ref && ref[0] === "#") {
      return `/hashtag/${encodeURIComponent(ref.substr(1))}`;
    }
    return "";
  };
};

module.exports = (input, mentions) =>
  md.block(input, {
    toUrl: toUrl(mentions)
  });