import { join } from "node:path";
import { respond } from "../audio/AudioService.js";
import type { Module } from "./types.js";

/**
 * Calls Google Translate's unofficial endpoint. No SDK — the maintained
 * `node-google-translate-skidz` wrapper was abandoned, so we hit the same
 * single_translate endpoint directly with a fetch.
 */
async function translate(text: string, fromLang: string, toLang: string): Promise<string> {
  const url = new URL("https://translate.googleapis.com/translate_a/single");
  url.searchParams.set("client", "gtx");
  url.searchParams.set("sl", fromLang);
  url.searchParams.set("tl", toLang);
  url.searchParams.set("dt", "t");
  url.searchParams.set("q", text);
  const res = await fetch(url.toString());
  if (!res.ok) throw new Error(`translate ${fromLang}->${toLang} failed: ${res.status}`);
  const json = (await res.json()) as unknown[];
  const segments = json[0];
  if (!Array.isArray(segments)) throw new Error("translate: unexpected response shape");
  return segments
    .map((seg) => (Array.isArray(seg) && typeof seg[0] === "string" ? seg[0] : ""))
    .join("");
}

export const mangle: Module = ({ audio, commands, config, rootDir }) => {
  const sysmsg = join(rootDir, "sysmsg.wav");
  const langs = (config.MANGLE_LANGS ?? "en,de,ja,ru,en").split(",").map((l) => l.trim());

  commands.register("mangle", async (_args, message) => {
    let str = message.content.slice(config.PREFIX.length + "mangle".length).trim();
    if (!str) return;
    for (let i = 0; i < langs.length - 1; i++) {
      const from = langs[i];
      const to = langs[i + 1];
      if (!from || !to) break;
      str = await translate(str, from, to);
    }
    respond(audio, sysmsg, message, str);
  });
};