import { existsSync, readFileSync } from "node:fs";

const requiredFiles = [
  "README.md",
  "dist/index.js",
  "dist/index.d.ts",
];

const missingFiles = requiredFiles.filter((path) => !existsSync(path));

if (missingFiles.length > 0) {
  console.error(`Missing package artifact(s): ${missingFiles.join(", ")}`);
  process.exit(1);
}

const packageJson = JSON.parse(readFileSync("package.json", "utf8"));

const expectedFields = {
  main: "dist/index.js",
  module: "dist/index.js",
  types: "dist/index.d.ts",
};

for (const [field, expected] of Object.entries(expectedFields)) {
  if (packageJson[field] !== expected) {
    console.error(`package.json ${field} must be ${expected}`);
    process.exit(1);
  }
}

if (packageJson.exports?.["."]?.types !== "./dist/index.d.ts") {
  console.error("package.json exports[\".\"].types must point to ./dist/index.d.ts");
  process.exit(1);
}

if (packageJson.exports?.["."]?.import !== "./dist/index.js") {
  console.error("package.json exports[\".\"].import must point to ./dist/index.js");
  process.exit(1);
}

console.log("Package metadata and artifacts are publish-ready.");