/*
 * Created by Chris Mudford - StimTech Pty Ltd
 *
 * This program is to use the Linn Lingo momentry push button with 2 LEDs to turn on and control the turntable motor speed.
 *
 */

#include <ezButton.h>

//Define the Digital IO's
const int LP12GreenLED = 4;             // LP12 Green LED 45RPM (switches HIGH through 2k2 current limiting resistor on Arduino PCB)
const int LP12RedLED = 5;               // LP12 Red LED 33RPM (switches HIGH through 2k2 current limiting resistor on Arduino PCB)
const int LP12PushButton = 6;           // LP12 momentary button (switches 5V LOW through Arduino input internal pullup)
const int SG4RotPushButton = 7;         // SG4 rotary encoder momentary button (switches 5V LOW through Arduino input internal pullup)
const int SG4StandbyButton = 8;         // SG4 Standby momentary button (switches LOW through 2k2 resistor on SG4)
const int SG4SpeedButton = 9;           // SG4 Speed momentary button (switches LOW through 2k2 resistor on SG4)
const int SG4RotClk = 10;               // SG4 Rotay encoder clk (switches LOW to deactivate clk when LP12 push button or SG4 Standby button are pressed)
const int SG4RotDt = 11;                // SG4 Rotay encoder clk (switches LOW to deactivate dt when LP12 push button or SG4 Standby button are pressed)

const int SHORT_PRESS_TIME = 5000;      // 5 seconds
const int LONG_PRESS_TIME  = 5000;      // 5 seconds
const int SG4ButtonPressDuration = 10;  // Time duration of SG4 standby button to be pulled LOW

ezButton button1 (LP12PushButton);      // Create ezButton object that is attached to the LP12PushButton pin
ezButton button2 (SG4RotPushButton);    // Create ezButton object that is attached to the SG4StandbyButton pin

unsigned long pressedTime  = 0;
unsigned long releasedTime = 0;
bool isPressing = false;
bool isLongDetected = false;
bool RunningState = false;              // False is not running

void setup() {
button1.setDebounceTime (50);          // Set debounce time to 50 milliseconds
button2.setDebounceTime (50);          // Set debounce time to 50 millisceonds

//Serial.begin(9600);

// Defines IO Pins operation and initial state.  Note: ezButton is Input_Pullup
pinMode (SG4StandbyButton, INPUT_PULLUP);    // Set as Input_Pullup so that it's output is already high when changed to output
pinMode (SG4StandbyButton, OUTPUT);          // Set pin as output
digitalWrite (SG4StandbyButton, HIGH);       // Set output HIGH
pinMode (SG4SpeedButton, INPUT_PULLUP);      // Set as Input_Pullup so that it's output is already high when changed to output
pinMode (SG4SpeedButton, OUTPUT);            // Set pin as output
digitalWrite (SG4SpeedButton, HIGH);         // Set output HIGH
pinMode (LP12RedLED, OUTPUT);                // Set pin as output
pinMode (LP12GreenLED, OUTPUT);              // Set pin as output
}

void loop() {
  
// If a push button is pressed, SG4 rotary encoder up and down are deactivated until the button is released   
  if(button1.getState() == LOW || button2.getState() == LOW) { // Is a push button pressed?
    pinMode (SG4RotClk, OUTPUT);                                // Set pin as output - LOW by default
    pinMode (SG4RotDt,OUTPUT);                                  // Set pin as output - LOW by default
      }
      else {
        pinMode (SG4RotClk, INPUT);                             // Set pin as input
        pinMode (SG4RotDt, INPUT);                              // Set pin as input
      }
  
  button1.loop(); // MUST call the loop() function first
  button2.loop(); // MUST call the loop() function first

  if(button1.isPressed() || button2.isPressed()){ // Checks if the LP12 button or rotary encoder switch is being pressed
    pressedTime = millis();
    isPressing = true;
    isLongDetected = false;
    Serial.write("test");

// If a push button is pressed and the turntable is not running take SG4 out of standby and turn on RedLED
  button1.loop();                                         // MUST call the loop() function first
  button2.loop();                                         // Must call the loop() function first

  if((button1.getState() == LOW || button2.getState() == LOW) && RunningState == false){ // Is a push button pressed and the turntable not running?
    RunningState = !RunningState;                          // Toggles the running state
    digitalWrite (SG4StandbyButton,LOW);                   // Takes the SG4 out of standby
    digitalWrite (LP12RedLED,HIGH);                        // Switches the LP12RedLED on indicating 33RPM
    delay (SG4ButtonPressDuration);                        // How long the GS4Standby button is switched LOW for
    digitalWrite (SG4StandbyButton,HIGH);                  // NEED TO CHANGE THIS TO HIGH WHEN USING WITH SG4
    Serial.write("turned on");
  }

  // If a push button is pressed and the turntable is running return SG4 into standby, switch SG4 speed to 33RPM, turn off RedLED and GreenLED
  else{
    button1.loop(); // MUST call the loop() function first
    button2.loop(); // Must call the loop() function first
  if((button1.getState() == LOW || button2.getState() == LOW) && RunningState == true){  // Is a push button pressed and the turntable not running?
    RunningState = !RunningState;                           // Toggles the running state
    digitalWrite (SG4StandbyButton, LOW);                   // Puts The SG4 Into Standby 
    digitalWrite (SG4SpeedButton, HIGH);                    // Switches The SG4 Speed To 33RPM
    digitalWrite (LP12RedLED, LOW);                         // Switches The LP12RedLED off
    digitalWrite (LP12GreenLED, LOW);                       // Switches The LP12GreenLED off
    delay (SG4ButtonPressDuration);                         // How long the GS4Standby Button is activated for
    digitalWrite (SG4StandbyButton, HIGH);                 // NEED TO CHANGE THIS TO HIGH WHEN USING WITH SG4
    Serial.write("turned off");
      }
    }
  }
  if(button1.isReleased() || button2.isReleased()) {        // Checks for LP12 button or SG4 rotary encoder switch being released
    isPressing = false;
    releasedTime = millis();
    long pressDuration = releasedTime - pressedTime;
  }

  if(isPressing == true && isLongDetected == false) {       // Checks if a button is being pressed and a long press not detected
    long pressDuration = millis() - pressedTime;            // Calculates how long button has been pressed
    if( pressDuration > LONG_PRESS_TIME ) {                 // If button is pressed longer than long press time a long press is detected
      isLongDetected = true;

//  If a push button is pressed long and the turntable is running changes SG4 speed to 45RPM, switches LP12RedLED LOW and LP12GreenLED HIGH
  if( isLongDetected == true  && RunningState == true){     // If a long press is detected and the turntable is running 
        digitalWrite (SG4SpeedButton, LOW);                 // Sets SG4SpeedButton to LOW i.e. 45RPM
        digitalWrite (LP12RedLED, LOW);                     // Turns LP12RedLED off
        digitalWrite (LP12GreenLED, HIGH);                  // Turns LP12GreenLED on indicating 45RPM
        Serial.write("45 RPM Selected");
      }
    }
  }
}