#!/usr/bin/env node

const parseArgs = require('minimist')

const argv = parseArgs(process.argv.slice(2), {
  alias: {
    p: 'port',
    H: 'hostname',
    g: 'gzip',
    s: 'silent',
    colors: 'colors',
    o: 'open',
    c: 'cache',
    m: 'micro',
    history: 'history',
    https: 'https',
    C: 'cert',
    K: 'key',
    P: 'proxy',
    h: 'help'
  },
  boolean: ['g', 'https', 'colors', 'S', 'history', 'h'],
  string: ['H', 'C', 'K'],
  default: {
    p: process.env.PORT || 4000,
    H: process.env.HOSTNAME || '0.0.0.0',
    g: true,
    c: 24 * 60 * 60,
    m: 1,
    colors: true
  }
})

if (argv.help) {
  console.log(`
  Description
    Start a HTTP(S) server on a folder.

  Usage
    $ quasar serve [path]
    $ quasar serve . # serve current folder

    If you serve a SSR folder built with the CLI then
    control is yielded to /index.js and params have no effect.

  Options
    --port, -p             Port to use (default: 8080)
    --hostname, -H         Address to use (default: 0.0.0.0)
    --gzip, -g             Compress content (default: true)
    --silent, -s           Supress log message
    --colors               Log messages with colors (default: true)
    --open, -o             Open browser window after starting
    --cache, -c <number>   Cache time (max-age) in seconds;
                           Does not apply to /service-worker.js
                           (default: 86400 - 24 hours)
    --micro, -m <seconds>  Use micro-cache (default: 1 second)
    --history              Use history api fallback;
                           All requests fallback to index.html
    --https                Enable HTTPS
    --cert, -C [path]      Path to SSL cert file (Optional)
    --key, -K [path]       Path to SSL key file (Optional)
    --proxy <file.js>      Proxy specific requests defined in file;
                           File must export Array ({ path, rule })
                           See example below. "rule" is defined at:
                           https://github.com/chimurai/http-proxy-middleware
    --help, -h             Displays this message

  Proxy file example
    module.exports = [
      {
        path: '/api',
        rule: { target: 'http://www.example.org' }
      }
    ]
    --> will be transformed into app.use(path, httpProxyMiddleware(rule))
  `)
  process.exit(0)
}

const
  fs = require('fs'),
  path = require('path')

const root = getAbsolutePath(argv._[0] || '.')
const resolve = p => path.resolve(root, p)

function getAbsolutePath (pathParam) {
  return path.isAbsolute(pathParam)
    ? pathParam
    : path.join(process.cwd(), pathParam)
}

const
  pkgFile = resolve('package.json'),
  indexFile = resolve('index.js')

let ssrDetected = false

if (fs.existsSync(pkgFile) && fs.existsSync(indexFile)) {
  const pkg = require(pkgFile)
  if (pkg.quasar && pkg.quasar.ssr) {
    console.log('Quasar SSR folder detected.')
    console.log('Yielding control to its own webserver.')
    console.log()
    ssrDetected = true
    require(indexFile)
  }
}

if (ssrDetected === false) {
  let green, grey, red

  if (argv.colors) {
    const chalk = require('chalk')
    green = chalk.green
    grey = chalk.grey
    red = chalk.red
  }
  else {
    green = grey = red = text => text
  }

  const
    express = require('express'),
    microCacheSeconds = argv.micro
      ? parseInt(argv.micro, 10)
      : false

  function serve (path, cache) {
    return express.static(resolve(path), {
      maxAge: cache ? parseInt(argv.cache, 10) * 1000 : 0
    })
  }

  const app = express()

  if (!argv.silent) {
    app.get('*', (req, res, next) => {
      console.log(
        `GET ${green(req.url)} ${grey('[' + req.ip + ']')} ${new Date()}`
      )
      next()
    })
  }

  if (argv.gzip) {
    const compression = require('compression')
    app.use(compression({ threshold: 0 }))
  }

  const serviceWorkerFile = resolve('service-worker.js')
  if (fs.existsSync(serviceWorkerFile)) {
    app.use('/service-worker.js', serve('service-worker.js'))
  }

  if (argv.history) {
    const history = require('connect-history-api-fallback')
    app.use(history())
  }

  app.use('/', serve('.', true))

  if (microCacheSeconds) {
    const microcache = require('route-cache')
    app.use(
      microcache.cacheSeconds(
        microCacheSeconds,
        req => req.originalUrl
      )
    )
  }

  if (argv.proxy) {
    let file = argv.proxy = getAbsolutePath(argv.proxy)
    if (!fs.existsSync(file)) {
      console.error('Proxy definition file not found! ' + file)
      process.exit(1)
    }
    file = require(file)

    const proxy = require('http-proxy-middleware')
    file.forEach(entry => {
      app.use(entry.path, proxy(entry.rule))
    })
  }

  app.get('*', (req, res) => {
    res.setHeader('Content-Type', 'text/html')
    res.status(404).send('404 | Page Not Found')
    if (!argv.silent) {
      console.log(red(`  404 on ${req.url}`))
    }
  })

  function getHostname (host) {
    return host === '0.0.0.0'
      ? 'localhost'
      : host
  }

  getServer(app).listen(argv.port, argv.hostname, () => {
    const
      url = `http${argv.https ? 's' : ''}://${getHostname(argv.hostname)}:${argv.port}`,
      { version } = require('../package.json')

    const info = [
      ['Quasar CLI', `v${version}`],
      ['Listening at', url],
      ['Web server root', root],
      argv.https ? ['HTTPS', 'enabled'] : '',
      argv.gzip ? ['Gzip', 'enabled'] : '',
      ['Cache (max-age)', argv.cache || 'disabled'],
      microCacheSeconds ? ['Micro-cache', microCacheSeconds + 's'] : '',
      argv.history ? ['History mode', 'enabled'] : '',
      argv.proxy ? ['Proxy definitions', argv.proxy] : ''
    ]
    .filter(msg => msg)
    .map(msg => ' ' + msg[0].padEnd(20, '.') + ' ' + green(msg[1]))

    console.log('\n' + info.join('\n') + '\n')

    if (argv.open) {
      const isMinimalTerminal = require('../lib/helpers/is-minimal-terminal')
      if (!isMinimalTerminal) {
        const opn = require('opn')
        opn(url)
      }
    }
  })

  function getServer (app) {
    if (!argv.https) {
      return app
    }

    let fakeCert, key, cert

    if (argv.key && argv.cert) {
      key = getAbsolutePath(argv.key)
      cert = getAbsolutePath(argv.cert)

      if (fs.existsSync(key)) {
        key = fs.readFileSync(key)
      }
      else {
        console.error('SSL key file not found!' + key)
        process.exit(1)
      }

      if (fs.existsSync(cert)) {
        cert = fs.readFileSync(cert)
      }
      else {
        console.error('SSL cert file not found!' + cert)
        process.exit(1)
      }
    }
    else {
      // Use a self-signed certificate if no certificate was configured.
      // Cycle certs every 24 hours
      const certPath = path.join(__dirname, '../ssl-server.pem')
      let certExists = fs.existsSync(certPath)

      if (certExists) {
        const certStat = fs.statSync(certPath)
        const certTtl = 1000 * 60 * 60 * 24
        const now = new Date()

        // cert is more than 30 days old
        if ((now - certStat.ctime) / certTtl > 30) {
          console.log(' SSL Certificate is more than 30 days old. Removing.')
          const { removeSync } = require('fs-extra')
          removeSync(certPath)
          certExists = false
        }
      }

      if (!certExists) {
        console.log(' Generating self signed SSL Certificate...')
        console.log(' DO NOT use this self-signed certificate in production!')

        const selfsigned = require('selfsigned')
        const pems = selfsigned.generate(
          [{ name: 'commonName', value: 'localhost' }],
          {
            algorithm: 'sha256',
            days: 30,
            keySize: 2048,
            extensions: [{
              name: 'basicConstraints',
              cA: true
            }, {
              name: 'keyUsage',
              keyCertSign: true,
              digitalSignature: true,
              nonRepudiation: true,
              keyEncipherment: true,
              dataEncipherment: true
            }, {
              name: 'subjectAltName',
              altNames: [
                {
                  // type 2 is DNS
                  type: 2,
                  value: 'localhost'
                },
                {
                  type: 2,
                  value: 'localhost.localdomain'
                },
                {
                  type: 2,
                  value: 'lvh.me'
                },
                {
                  type: 2,
                  value: '*.lvh.me'
                },
                {
                  type: 2,
                  value: '[::1]'
                },
                {
                  // type 7 is IP
                  type: 7,
                  ip: '127.0.0.1'
                },
                {
                  type: 7,
                  ip: 'fe80::1'
                }
              ]
            }]
          }
        )

        try {
          fs.writeFileSync(certPath, pems.private + pems.cert, { encoding: 'utf-8' })
        }
        catch (err) {
          console.error(' Cannot write certificate file ' + certPath)
          console.error(' Aborting...')
          process.exit(1)
        }
      }

      fakeCert = fs.readFileSync(certPath)
    }

    return require('https').createServer({
      key: key || fakeCert,
      cert: cert || fakeCert
    }, app)
  }
}