import * as core from '@actions/core';
import * as path from 'path';
import * as fs from 'fs';
import * as os from 'os';

export function setNpmrc(
  registryUrl: string,
  registryToken: string,
  authFile?: string
) {
  let projectNpmrc: string = path.resolve(process.cwd(), '.npmrc');
  if (authFile) {
    projectNpmrc = path.resolve(process.cwd(), authFile);
  }

  let newContents = '';
  if (fs.existsSync(projectNpmrc)) {
    const curContents = fs.readFileSync(projectNpmrc, 'utf8');
    curContents.split(os.EOL).forEach(line => {
      // Add current contents unless they are setting the registry
      if (!line.startsWith('registry')) {
        newContents += line + os.EOL;
      }
    });
  }
  newContents +=
    'registry=' +
    registryUrl +
    os.EOL +
    'always-auth=true' +
    os.EOL +
    registryUrl +
    ':_authToken=${NPM_TOKEN}';
  fs.writeFileSync(projectNpmrc, newContents);

  core.exportSecret('NPM_TOKEN', registryToken);
}