import { findUp } from "find-up";
import { config } from "dotenv";
import fs from "fs";
import yargs from "yargs";
import { hideBin } from "yargs/helpers";

async function parseDotenv(nodeEnv) {
  const envFilePath = await findUp(`.env.${nodeEnv}`);

  const parsedEnv = config({ path: envFilePath }).parsed || {};

  return parsedEnv;
}

function writeEnv(parsedEnv) {
  const scriptFilePath = `${fs.realpathSync(process.cwd())}/public/__ENV__.js`;

  fs.writeFileSync(
    scriptFilePath,
    `window.__ENV__ = ${JSON.stringify(parsedEnv)}`,
  );
}

yargs(hideBin(process.argv))
  .command(
    "next-env",
    "Create Next.js runtime environment js",
    function builder(y) {
      return y.option("env", {
        alias: "e",
        type: "string",
        description: "Environment name(ex: development, production)",
      });
    },
    async function handler(args) {
      const nodeEnv = args.e || args.env || "development";

      const parsedEnv = await parseDotenv(nodeEnv); // dotenv 파싱
      writeEnv(parsedEnv); // 환경 변수 스크립트 파일 생성

      return parsedEnv;
    },
  )
  .parse();