#!/usr/bin/env node

/**
 * Module dependencies.
 */

const program = require('./commander');
const parseDuration = require('parse-duration');
const Table = require('cli-table');
const AssetModel = require('../models/asset');
const mongoose = require('../services/mongoose');
const scraper = require('../services/scraper');
const util = require('./util');

// Register the shutdown criteria.
util.onshutdown([
  () => mongoose.disconnect()
]);

/**
 * Lists all the assets registered in the database.
 */
function listAssets() {
  AssetModel
    .find({})
    .sort({'created_at': 1})
    .then((asset) => {
      let table = new Table({
        head: [
          'ID',
          'Title',
          'URL'
        ]
      });

      asset.forEach((asset) => {
        table.push([
          asset.id,
          asset.title ? asset.title : '',
          asset.url ? asset.url : ''
        ]);
      });

      console.log(table.toString());
      util.shutdown();
    })
    .catch((err) => {
      console.error(err);
      util.shutdown(1);
    });
}

function refreshAssets(ageString) {
  const now = new Date().getTime();
  const ageMs = parseDuration(ageString);
  const age = new Date(now - ageMs);

  AssetModel.find({
    $or: [
      {
        scraped: {
          $lte: age
        }
      },
      {
        scraped: null
      }
    ]
  })

  // Queue all the assets for scraping.
  .then((assets) => Promise.all(assets.map(scraper.create)))

  .then(() => {
    console.log('Assets were queued to be scraped');
    util.shutdown();
  })
  .catch((err) => {
    console.error(err);
    util.shutdown(1);
  });
}

//==============================================================================
// Setting up the program command line arguments.
//==============================================================================

program
  .command('list')
  .description('list all the assets in the database')
  .action(listAssets);

program
  .command('refresh <age>')
  .description('queues the assets that exceed the age requested')
  .action(refreshAssets);

program.parse(process.argv);

// If there is no command listed, output help.
if (!process.argv.slice(2).length) {
  program.outputHelp();
  util.shutdown();
}