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

const __dirname = path.dirname(fileURLToPath(import.meta.url));
const targetDir = path.resolve(__dirname, "../shared");
const sourceDir = path.resolve(__dirname, "../../shared");

if (!fs.existsSync(sourceDir)) {
  console.log(
    "[sync-shared] skip: repo shared/ not found, keep downLoadServer/shared as deployed copy",
  );
  process.exit(0);
}

fs.mkdirSync(targetDir, { recursive: true });

const sourceFiles = fs
  .readdirSync(sourceDir)
  .filter((name) => !name.startsWith(".") && fs.statSync(path.join(sourceDir, name)).isFile());

sourceFiles.forEach((name) => {
  fs.copyFileSync(path.join(sourceDir, name), path.join(targetDir, name));
});

const stale = fs
  .readdirSync(targetDir)
  .filter((name) => !name.startsWith(".") && !sourceFiles.includes(name));
stale.forEach((name) => {
  fs.unlinkSync(path.join(targetDir, name));
});

console.log(
  `[sync-shared] copied ${sourceFiles.length} files to downLoadServer/shared${
    stale.length ? `, removed ${stale.length} stale` : ""
  }`,
);
sourceFiles.forEach((name) => console.log(`  - ${name}`));