// Assembles sux.user.js: metadata block + the extension's ../shared.js (reused
// verbatim, scoped so it doesn't leak a global) + src/main.js with the panel
// markup and styles inlined.
//
//   node userscript/build.mjs           write sux.user.js
//   node userscript/build.mjs --check   exit 1 if sux.user.js is stale
import { readFileSync, writeFileSync } from "node:fs";
import { fileURLToPath } from "node:url";
import { dirname, join } from "node:path";

const here = dirname(fileURLToPath(import.meta.url));
const read = (p) => readFileSync(join(here, p), "utf8");
const indent = (s) => s.replace(/^(?=.)/gm, "  ");

export function build() {
  const main = read("src/main.js")
    .replace("__SUX_PANEL_CSS__", () => JSON.stringify(read("src/panel.css")))
    .replace("__SUX_PANEL_HTML__", () => JSON.stringify(read("src/panel.html")));
  return [
    read("src/meta.txt"),
    "// Generated by userscript/build.mjs — edit userscript/src/ and ../shared.js, not this file.",
    "(function () {",
    '  "use strict";',
    "",
    "  var SuxShared = (function (globalThis) {",
    indent(indent(read("../shared.js").trimEnd())),
    "    return globalThis.SuxShared;",
    "  })({});",
    "",
    indent(main.trimEnd()),
    "})();",
    "",
  ].join("\n");
}

if (process.argv[1] === fileURLToPath(import.meta.url)) {
  const out = join(here, "sux.user.js");
  const next = build();
  if (process.argv.includes("--check")) {
    let current = "";
    try { current = readFileSync(out, "utf8"); } catch { /* missing */ }
    if (current !== next) {
      console.error("sux.user.js is stale — run: node userscript/build.mjs");
      process.exit(1);
    }
  } else {
    writeFileSync(out, next);
    console.log("wrote " + out);
  }
}