const glob = require('glob');
const spawn = require('child_process').spawn;
const tag_reader = spawn('/home/annika/rfid/run-tag-reader');
const player = spawn('/usr/bin/sudo', ['-n', '/usr/bin/mpg321', '-R', '-']);

tag_reader.on('error', function(err) {
  console.log(`[tag_reader:error] ${err}`);
});

player.on('error', function(err) {
  console.log(`[player:error] ${err}`);
});

// player.stdin.write("GAIN 100");

last_tag = null;
debounce_until = 0;

function lookup(tag, cb) {
  if (tag === 'b9506555d9') {
    return cb('STOP');
  }
  if (tag === 'aa89665510') {
    return cb('PAUSE', 2);
  }
  glob('media/' + tag + ' - *.mp3', function(er, files) {
    if (files.length > 0) {
      return cb("LOAD " + files[0], 5);
    }
  });
}

tag_reader.stdout.on('data', (data) => {
  if (Date.now() / 1000 < debounce_until) {
    return;
  }
  last_tag = String(data).trim();
  console.log("Tag: " + last_tag);
  lookup(last_tag, function(action, wait_sec) {
    wait_sec = wait_sec || 1;
    if (action) {
      debounce_until = Date.now() / 1000 + wait_sec;
      console.log(`Running ${action} for ${last_tag}`);
      player.stdin.write(action + "\n");
    }
  });
});

tag_reader.stderr.on('data', (data) => {
  console.log(`[tag_reader:stderr] ${data}`);
});

player.stderr.on('data', (data) => {
  if (String(data).substr(0, 3) === "@F ") {
    return;
  }
  console.log(`[player:stderr] ${data}`);
});

var express = require('express')
  , logger = require('morgan')
  , app = express()
  , template = require('jade').compileFile(__dirname + '/source/templates/homepage.jade')

app.use(logger('dev'))
app.use(express.static(__dirname + '/static'))

app.get('/', function (req, res, next) {
  try {
    var html = template({ title: 'Home', last_tag: last_tag })
    res.send(html)
  } catch (e) {
    next(e)
  }
})

app.listen(process.env.PORT || 80, function () {
  console.log('Listening on http://localhost:' + (process.env.PORT || 80))
})