import fs from "node:fs";
import path from "node:path";
import { fileURLToPath } from "node:url";

const scriptDir = path.dirname(fileURLToPath(import.meta.url));
const webRoot = path.resolve(scriptDir, "..");
const outRoot = path.join(webRoot, "out");
const sourceDir = outRoot;
const targetName = process.env.EXPORT_TARGET_DIR || "public";
const targetDir = path.join(webRoot, "..", targetName);
const basePath = process.env.NEXT_PUBLIC_BASE_PATH || "/chatbot/app";
const uiMode = process.env.NEXT_PUBLIC_UI_MODE || "app";

if (!fs.existsSync(sourceDir)) {
  console.error(`[export-public] 빌드 출력 없음: ${sourceDir}`);
  console.error("NEXT_PUBLIC_BASE_PATH=/chatbot/app npm run build:deploy");
  process.exit(1);
}

function copyRecursive(src, dest) {
  fs.mkdirSync(dest, { recursive: true });
  for (const entry of fs.readdirSync(src, { withFileTypes: true })) {
    const from = path.join(src, entry.name);
    const to = path.join(dest, entry.name);
    if (entry.isDirectory()) {
      copyRecursive(from, to);
    } else {
      fs.copyFileSync(from, to);
    }
  }
}

for (const name of fs.existsSync(targetDir) ? fs.readdirSync(targetDir) : []) {
  const p = path.join(targetDir, name);
  if (name === ".gitkeep") continue;
  fs.rmSync(p, { recursive: true, force: true });
}

copyRecursive(sourceDir, targetDir);

const versionPath = path.join(targetDir, "VERSION");
const version = fs.existsSync(versionPath)
  ? fs.readFileSync(versionPath, "utf8").trim()
  : "3.0.0";
const stamp = `${version} (${uiMode}@${basePath})`;
fs.writeFileSync(versionPath, `${stamp}\n`, "utf8");

console.log(`[export-public] ✅ ${sourceDir} → ${targetDir} (${stamp})`);