/*
* sketch used to test everything ...
*
*/
#include <Wire.h> 
#include <LiquidCrystal_I2C.h>

#define BTN1 2 // push button input 
bool btn1State = 0 ;

// rotary encoder 1 
#define CLK1 3
#define DT1 4
#define SW1 5

int counter1=0;
int currentStateCLK1;
int lastStateCLK1;
String currentDir1="";
unsigned long lastButtonPress1 = 0;

LiquidCrystal_I2C lcd(0x27,16,2);  // set the LCD address to 0x27 for a 16 chars and 2 line display

// the setup function runs once when you press reset or power the board
void setup() {
  Serial.begin(9600);
  // digital inits 
  pinMode(LED_BUILTIN, OUTPUT);
  pinMode(BTN1, INPUT_PULLUP);

  pinMode(CLK1,INPUT);
  pinMode(DT1,INPUT);
  pinMode(SW1, INPUT_PULLUP);

  // fct launched at startup
  LCD_intro();
  attachInterrupt(digitalPinToInterrupt(CLK1), check_encoders, FALLING);
}

// the loop function runs over and over again forever
void loop() {
  // blink_led();
  check_button();
  LCD_menu();
}


void check_encoders(){
    int dtValue = digitalRead(DT1);
    if (dtValue == HIGH) {
      counter1++; // Clockwise
    }
    if (dtValue == LOW) {
      counter1--; // Counterclockwise
    }
  Serial.println(counter1);
  // Read the button state
  int btnState1 = digitalRead(SW1);

  //If we detect LOW signal, button is pressed
  if (btnState1 == LOW) {
    //if 50ms have passed since last LOW pulse, it means that the
    //button has been pressed, released and pressed again
    if (millis() - lastButtonPress1 > 50) {
      Serial.println(F("Button 1 pressed!"));
      counter1 = 0;
      LCD_menu();
    }

    // Remember last button press event
    lastButtonPress1 = millis();
  }
  // Put in a slight delay to help debounce the reading
  delay(1);
}


void check_button(){
  btn1State = digitalRead(BTN1);
  if(btn1State == 0){
    digitalWrite(LED_BUILTIN, HIGH);
    LCD_message("button pressed !","waiting 1s ...",1000);
  }
  else {
    digitalWrite(LED_BUILTIN, LOW);
  }
}

void blink_led(){
  digitalWrite(LED_BUILTIN, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(200);                       // wait 
  digitalWrite(LED_BUILTIN, LOW);    // turn the LED off by making the voltage LOW
  delay(200); 
}

void LCD_intro(){
  // configure & launch LCD display 
  lcd.init();                      
  lcd.clear(); 
  lcd.backlight();   
  lcd.setCursor(0,0);
  // TODO : make an animation with autoscroll() and ----
  lcd.print("ARDUINO UNO tests");
  lcd.setCursor(0,1);
  lcd.print("by whips@musinux");
  delay(500);
}

void LCD_message(String line1, String line2, int del){
  lcd.clear(); 
  lcd.setCursor(0,0);
  lcd.print(line1); // 16 chars long 
  lcd.setCursor(0,1);
  lcd.print(line2);
  delay(del);
}

void LCD_menu(){
  lcd.clear(); 
  lcd.setCursor(0,0);
  lcd.print(""); // 
  lcd.setCursor(0,1);
  lcd.print(""); // 
  delay(100);
}