var logger = require('winston');
var rpio = require("rpio")

var relay_status = [
  {
    code: "L01",
    status: true,
    pin: 35
  }
]

module.exports.start = function(router, channel){
  logger.info("Starting Relay controller module");
  rpio.open(relay_status[0].pin, rpio.OUTPUT, rpio.LOW);
  router.post('/switch_relay', function (req, res) {
    logger.info("Received request for switching relays", req.body);
    if(req.body != undefined){
      var relay = req.body;
      if(relay.code != undefined && relay.status != undefined){
        var done = switchRelay(relay.code, relay.status);
        if(done){
            channel.emit('relay_switch', { code: relay.code, status: relay.status });
        }
      }
    }
    res.sendStatus(200);
  });

}

module.exports.monitor = function(socket, channel){
  socket.on('relay_switch_update', function (data) {
    logger.info("relay_switch_update", data);
    socket.emit("relay_switch", relay_status[0]);
  });
}



var switchRelay = function(code, status){
  switch (code) {
    case "L01":
      // switch on light relay
      if(status == true) {
        rpio.write(relay_status[0].pin, rpio.HIGH);
        logger.debug("Switched L01 ON");
      } else {
        rpio.write(relay_status[0].pin, rpio.LOW);
        logger.debug("Switched L01 OFF");
      }
      relay_status[0].status = status;
      return true;
      break;
    default:
      return false;
  }
}