const puppeteer = require('puppeteer')
const superagent = require('superagent');
const path = require('path');
const express = require('express');
const glob = require('glob');
const _ = require('lodash');
const app = express();
var bodyParser = require('body-parser')
const CronJob = require('cron').CronJob;

const processors = [];
//load the processor files
glob(path.resolve(__dirname, 'processors/*.processor.js'), (error, matches) => {
  console.log(matches);
  _.forEach(matches, file => {
    const processor = require(path.resolve(__dirname, file));
    processors.push(processor);
  })
  console.log(`${matches.length} processors loaded`);
})
//load the crawler files
glob(path.resolve(__dirname, 'crawlers/*.crawler.js'), (error, matches) => {
  console.log(matches);
  _.forEach(matches, file => {
    const crawler = require(path.resolve(__dirname, file));
    const cronJob = new CronJob(crawler.cronString, crawler.run);
    cronJob.start();
    
  })
  console.log(`${matches.length} crawlers loaded`);
})
app.use(bodyParser.json())
app.post('/convertGalleryToHar', async (req, res) => {
  const url = req.body.url;
  console.log(url);

  // get processor
  const searchableHostname = (new URL(url)).hostname.replace(/^www\./i, '');
  console.log('Searching for hostname:', searchableHostname)
  const processor = _.find(processors, (processor) => (searchableHostname) === (processor.baseUrl.replace(/^www\./i, '')));
  if (!processor) {
    return res.status(400).json({
      message: 'Could not find processor for url'
    })
  }
  console.log('Processor found', processor.baseUrl);
  try {
    const payloads = await run(url, processor);
    res.status(200).json({
      vin: payloads.vin,
      mileage: payloads.mileage,
      log: {
        entries: payloads.payloads
      }
      // payloads
    })
  } catch (error) {
    console.log(error);
    res.status(500).json(error);
  }

})
app.get('/supportedSites', async (req, res) => {
  res.status(200).json(processors.map(p => p.baseUrl));
})
app.listen(2667);

async function run(url, processor) {
  const browser = await puppeteer.launch({
    headless: true
  });

  const page = await browser.newPage();
  await page.setViewport({
    width: 1200,
    height: 800
  });
  await page.setUserAgent("Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/44.0.2403.157 Safari/537.36");
  console.log('Loading page...');
  await page.goto(url, { timeout: 60000 });
  console.log('page loaded');
  console.log('attempting to parse fields');
  const vin = await processor.parseVIN(page);
  console.log('parsed VIN:', vin);
  const mileage = await processor.parseMileage(page);
  console.log('parsed Mileage:', mileage);
  const galleryUrls = await processor.execute(page);
  await page.close();

  console.log('Done collecting URLS', galleryUrls.length);
  const payloads = await Promise.all(galleryUrls.map(image => new Promise(async (resolve, reject) => {
    if(image.url) {
      superagent.get(image.url).responseType('blob').then(function (response) {
        if (response.statusCode == 200) {
          console.log('Resolving', image.url)
          return resolve({
            response: {
              content: {
                mimeType: response.headers["content-type"],
                encoding: 'base64',
                text: response.body.toString('base64')
              }
            }
          });
        } else {
          console.log("Invalid status code", response.statusCode, 'for', image.url);
          resolve({})

        }
      }).catch(error => {
        console.error(error)
        resolve({})
      });
    } else if (image.base64){
      return resolve({
            response: {
              content: {
                mimeType: response.headers["content-type"],
                encoding: 'base64',
                text: image.base64
              }
            }
          });
    }
  })))
  console.log('URLS done downloading')
  await browser.close();
  return {
    vin,
    payloads,
    mileage
  };
}

// run();