/**
 * @description
 * This is a simplified version of cedict2json.js by Kevin Yang, modified to be
 * run with deno, only using std dependencies.
 *
 * @reference https://github.com/kevb34ns/CEDICT2JSON/blob/master/cedict2json.js
 * @reference https://www.mdbg.net/chinese/dictionary?page=cc-cedict
 *
 * CC-CEDICT is licensed under the Creative Commons Attribution-Share
 * Alike 3.0 License (https://creativecommons.org/licenses/by-sa/3.0/).
 * You must give proper attribution and license any changes or
 * improvements to the data under the same license.
 */
import { TextLineStream } from "jsr:@std/streams/text-line-stream";
import { toTransformStream } from "jsr:@std/streams/to-transform-stream";

interface Entry {
  traditional: string;
  simplified: string;
  pinyin: string;
  definitions: string[];
}

const utf8Stream = (await Deno.open("cedict_ts.u8")).readable
  .pipeThrough(new TextDecoderStream())
  .pipeThrough(new TextLineStream())
  .pipeThrough(toTransformStream(async function* (src) {
    for await (const line of src) {
      if (line.trim().charAt(0) !== "#") {
        const entry = parseEntry(line);
        if (entry !== null) yield entry;
      }
    }
  }));

const entryArray: Entry[] = await Array.fromAsync(utf8Stream);

await Deno.writeTextFile("cedict.json", JSON.stringify(entryArray, null, "\t"));

function parseEntry(entry: string): Entry | null {
  const firstSpace = entry.indexOf(" ");
  const secondSpace = entry.indexOf(" ", firstSpace + 1);
  const bracketsMatch = entry.match(/\[(.*?)\]/);
  const definitions = entry.match(/\/(.*?)\//g);

  if (
    firstSpace <= 0 ||
    secondSpace <= 0 ||
    bracketsMatch === null ||
    definitions === null ||
    definitions.length === 0
  ) {
    console.log("Invalid entry: " + entry);
    return null;
  }

  return {
    traditional: entry.substring(0, firstSpace),
    simplified: entry.substring(firstSpace + 1, secondSpace),
    pinyin: bracketsMatch[1],
    definitions: definitions.map((def) => def.replace(/[\/]/g, "")),
  };
}