const { writeFile: writeF, existsSync: exists, mkdirSync: makeDirSync } = require('node:fs');

require('dotenv').config();

function getCliArg(name: string): string | undefined {
  const prefix = `--${name}`;
  const argv = process.argv;
  const idx = argv.findIndex((a) => a === prefix || a.startsWith(prefix + '='));
  if (idx === -1) return undefined;
  const current = argv[idx];
  if (current.includes('=')) return current.split('=')[1];
  return argv[idx + 1];
}

const environmentVar = getCliArg('environment');

function writeFileUsingFS(targetPath: string, environmentFileContent: string) {
  writeF(targetPath, environmentFileContent, function (err: NodeJS.ErrnoException | null) {
    if (err) {
      console.error(err);
    }
    if (environmentFileContent !== '') {
      console.log(`write ${environmentFileContent} to ${targetPath}`);
    }
  });
}

// Providing path to the `environments` directory
const envDir = 'apps/processpuzzle-testbed/src/environments';

// creates the `environments` directory if it does not exist
if (!exists(envDir)) {
  makeDirSync(envDir);
}

//creates the `environment.prod.ts`, `environment.test.ts` and `environment.ts` file if it does not exist
writeFileUsingFS(`${envDir}/environment.dev.ts`, '');
writeFileUsingFS(`${envDir}/environment.ci.ts`, '');
writeFileUsingFS(`${envDir}/environment.prod.ts`, '');
writeFileUsingFS(`${envDir}/environment.stage.ts`, '');
writeFileUsingFS(`${envDir}/environment.ts`, '');

// choose the correct targetPath based on the environment chosen
let targetPat: string;

switch (environmentVar) {
  case 'dev':
    targetPat = `${envDir}/environment.dev.ts`;
    break;
  case 'ci':
    targetPat = `${envDir}/environment.ci.ts`;
    break;
  case 'stage':
    targetPat = `${envDir}/environment.stage.ts`;
    break;
  case 'prod':
    targetPat = `${envDir}/environment.prod.ts`;
    break;
  default:
    targetPat = `${envDir}/environment.ts`;
    break;
}

//actual content to be compiled dynamically and pasted into respective environment files
const fileContent = `

  // This file was autogenerated by dynamically running setEnv.ts and using dotenv for managing API key secrecy
  import { EnvironmentVariables } from './environment-variables';

  export const environment: EnvironmentVariables = {
    FIREBASE_API_KEY: '${process.env['FIREBASE_API_KEY']}',
    PIPELINE_STAGE: '${process.env['PIPELINE_STAGE']}'
  };

`;

writeFileUsingFS(targetPat, fileContent); // appending data into the target file/* eslint:enable */
writeFileUsingFS(`${envDir}/environment.ts`, fileContent);

// Emit runtime-env.json so main.ts can load it in non-Docker stages (dev/stage/prod).
// In Docker (ci), docker-entrypoint.sh overwrites this file from container env vars at startup.
// Values are stringified the same way as the TS env file above (missing env → literal "undefined").
const assetsDir = 'apps/processpuzzle-testbed/src/assets';
const runtimeEnvContent =
  JSON.stringify(
    {
      PIPELINE_STAGE: `${process.env['PIPELINE_STAGE']}`,
      FIREBASE_API_KEY: `${process.env['FIREBASE_API_KEY']}`,
    },
    null,
    2,
  ) + '\n';
writeFileUsingFS(`${assetsDir}/runtime-env.json`, runtimeEnvContent);