/* eslint-disable no-console */
const fs = require("node:fs");
const path = require("node:path");

function patchIfNeeded(targetPath) {
  if (!fs.existsSync(targetPath)) {
    console.warn(`[opennext patch] Skip: missing file: ${targetPath}`);
    return false;
  }

  const text = fs.readFileSync(targetPath, "utf8");
  const oldStr = "throw new Error(`Unexpected loadManifest(${path2}) call!`)";
  const newStr = "return{}";

  const count = text.split(oldStr).length - 1;

  if (count === 0) {
    console.log("[opennext patch] handler already patched (or no-op).");
    return false;
  }

  if (count !== 1) {
    console.warn(`[opennext patch] Unexpected match count: ${count}`);
  }

  const patched = text.replace(oldStr, newStr);
  fs.writeFileSync(targetPath, patched, "utf8");
  console.log(`[opennext patch] Patched handler loadManifest in ${path.relative(process.cwd(), targetPath)}`);
  return true;
}

const target = path.join(
  process.cwd(),
  ".open-next",
  "server-functions",
  "default",
  "handler.mjs",
);

patchIfNeeded(target);