//Partial Solution to Arduino exercise
//A program allows you to manipulate the brightness of an led by turning a knob hooked up the the arduino, it also has a button that turns the led completely on or off.
//Additionally, users can enter the string "report" into the serial monito and have the program report back to the the precentage of brightness that the led is at.

//Variables for ours pins
byte ledPin = 9; //identify the pin for the led
byte switchPin = 8; //identify the pin for the pushbutton

void setup(){
  Serial.begin(9600); //starts the Serial
  pinMode(switchPin, INPUT); //declares our button/switch as an Input
  pinMode(ledPin, OUTPUT); //declares our led as an output
}

//Declare variables
int sensorValue; //Stores the value from the potentiometer, values from 0-1023
float voltage; //Converts the sensorValue into voltage, values from 0-5.0
float brightness; //Converts our voltage into values the led can handle, values from 0-255
int reportValue; //The value we will report to our user, values from 0-100
boolean switchMem = false; //set the initial switch memory to false
boolean ledState = false;  //false for off, true for on
String finalString;

String Word = "report";//used for our serialEvent

void loop(){
  
  //Assign values to the variables we declared earlier. 
  sensorValue = analogRead(A0); 
  voltage = sensorValue * (5.0 / 1023.0);
  brightness = voltage * 51.0;
  reportValue = voltage * 20; 
  
  //Starts our switchPin functionality
  
  if (digitalRead(switchPin) && !switchMem){
    switchMem = true;
//    Serial.println("SWITCH"); // debug
  }
  
  else if(switchMem && !digitalRead(switchPin)) {
    if (ledState == false) {
      ledState = true;
    }
    
    else if (ledState == true) {
      analogWrite(ledPin, LOW);
      ledState = false;
    }
    switchMem = false;
    delay(10);
  }
  
  if (ledState == true)
   analogWrite(ledPin, brightness);
}

void serialEvent(){
  String userInput = Serial.readString();
  finalString = "The led is at " + String(reportValue) + "%";
  if(userInput == Word){
    Serial.println(finalString);
  }
}