const os = require('os');
const jsonPath = require('jsonpath');

const FILTERABLE = [
  'userInfo',
  'cpus'
];

module.exports.templateTags = [{
  displayName: 'OS',
  name: 'os',
  description: 'get OS info',
  args: [{
    displayName: 'Function',
    type: 'enum',
    options: [
      {displayName: 'arch', value: 'arch'},
      {displayName: 'cpus', value: 'cpus'},
      {displayName: 'freemem', value: 'freemem'},
      {displayName: 'hostname', value: 'hostname'},
      {displayName: 'platform', value: 'platform'},
      {displayName: 'release', value: 'release'},
      {displayName: 'userInfo', value: 'userInfo'}
    ]
  }, {
    displayName: 'JSONPath Filter',
    help: 'Some OS functions return objects. Use JSONPath queries to extract desired values.',
    hide: args => !FILTERABLE.includes(args[0].value),
    type: 'string',
  }],
  run (context, fnName, filter) {
    let value = os[fnName]();

    if (jsonPath && FILTERABLE.includes(fnName)) {
      try {
        value = jsonPath.query(value, filter)[0];
      } catch (err) {
      }
    }

    if (typeof value !== 'string') {
      return JSON.stringify(value);
    } else {
      return value;
    }
  }
}];