//***************************************************************
//Program:    Mail_Desktop.ino
//IDE:        Processing
//Target Dev: PC/Mac/Linux computer capable of running Processing
//Description:  Serves as the receiver of serial data from a
//wireless MSP430RF2500 and a USB-based MSP430FR5969 LaunchPad
//experimenter board.
//This sketch listens for a serial string coming in from Node0001
//this is the MSP430 attached to the Mailbox.  It parses the string
//looking for the light reading from the ambient light sensor.
//If that voltage reading exceed the thrshold voltage of 0.5V then
//it send a keyword string "MAIL" to the LaunchPad device.
//The LaunchPad in turn handles activiating a servo and LED.
//***************************************************************

//Import needed libraries
import processing.serial.*;

//Declare and initialize variables
int lf = 10;
float voltage = 0.0;
String myString = null;
String voltString = null;
String deviceID  = null;
String Node1 = "0001";
float thresholdVal = 0.5;
Serial myInPort; 
Serial myOutPort;
PFont f; 

//***************************************************************
//Function:  setup
//Description:  Intializes the hardware such as the serial ports
//and establishes parameters for the screen that is displayed
//on the computer.
//***************************************************************
void setup() {
  //Display all attached COM ports
  println(Serial.list());
  
  //Declare input port from MSP430RF2500
  //Declare string to store the serial stream, initialize blank.
  myInPort = new Serial(this, Serial.list()[2], 9600);
  myInPort.clear();
  myString = myInPort.readStringUntil(lf);
  myString = null;

  //Declare the output serial port to the LaunchPad
  myOutPort = new Serial(this, Serial.list()[0], 9600);
  myOutPort.clear();

  //Declare screen parameters and initialize
  size(500, 100);
  f = createFont("Arial", 16, true);
  background(255);
  textFont(f, 16);                 
  fill(0);                        
  text("Awaiting Delivery.", 10, 60);
  //text(voltString+"V", 10, 60);   //debug statement to see raw voltage reading
  println(myString);
}


//***************************************************************
//Function:  draw
//Description:  This is the main loop that constantly runs.
//Procedure is:
// - Read serial stream from RF2500
// -If it is from device connected to mailbox, parse string
// -If the voltage level contained in the string, exceeds 0.5V then
// -Send keyword "MAIL" over serial port to the LaunchPad
// -Otherwise ignore and continue to listen
//***************************************************************
void draw() {
  while (myInPort.available () > 0) {          //If string avialble to read, read into myString
    myString = myInPort.readStringUntil(lf);
    if (myString != null) {
      //println(myString);   //debug statement to see raw string
    }
  }

  //Parse out the node indentifier, we only want to handle the Mailbox MSP430
  //Parse out the voltage reading from the ambient light sensor
  voltString = myString.substring(30, 33);
  deviceID = myString.substring(5, 9);

  //If this is the MSP430 connected to the Mailbox, proceed
  if (deviceID.equals(Node1) == true ) {
  
    voltage = float(voltString);  //convert votlage from string to float

    if (voltage > thresholdVal) {   //If voltage exceeds threshold
      myOutPort.write("Mail");      //Send message to LaunchPad
      myOutPort.write("\n");
      background(255);
      textFont(f, 16);                 
      fill(0);                        
      text("Delivery In Progress!", 10, 60);  //Give onscreen confirmation to user
      println(myString);
      
    } else {                       //Else send a NEGATIVE message to LaunchPad
      myOutPort.write("NoMail"); 
      myOutPort.write("\n");
      background(255);
      textFont(f, 16);                 
      fill(0);                        
      text("Awaiting Delivery.", 10, 60);
      println(myString);
    }
  }
}