//YWROBOT
//Compatible with the Arduino IDE 1.0
//Library version:1.1
#include <LiquidCrystal_I2C.h>
#define ENCODER_CLK 2
#define ENCODER_DT  3
#define ENCODER_SW 4
#define BTN_1 5
#define BTN_2 6

LiquidCrystal_I2C lcd(0x27,20,4);  // set the LCD address to 0x27 for a 16 chars and 2 line display
uint8_t ipilot = 0;
uint8_t ityp = 0;
uint8_t iwartung = 0;

int start = 1;
int bt2_0 = 1;
int az_mode=0;

char cpilot;
char ctyp;
char cwartung;


typedef enum {
  SET_PILOT,
  SET_TYP
} Mode;

Mode mode = SET_TYP;

char* Pilot[] = {"Altenkirch","Nela","Eggestein","Appenheimer","Baum"};
char* Typ[] = {"Gast","Schulung","Werkstatt","Verein"};
char* Wartung[] = {"Tag","Stunde"};


void updateDisplay() {
   // Print a message to the LCD.
  lcd.setCursor(3,0);
//  lcd.print("Hello, world!");

   if (mode == SET_PILOT) {
    lcd.setCursor(0, 0);
    lcd.print("                    "); 
    lcd.setCursor(0, 0);
    lcd.print("Pilot ");
    lcd.setCursor(6,0);
    lcd.print(">"); 
    lcd.setCursor(7, 0);
    lcd.print(Pilot[ipilot]);
   }
    else {
    lcd.setCursor(5,0);
    lcd.print(": "); 
   }

   if (mode == SET_TYP) {
    lcd.setCursor(0, 1);
    lcd.print("                    ");
    lcd.setCursor(0, 1);
    lcd.print("Co   ");
    lcd.setCursor(6,1);
    lcd.print(">"); 
    lcd.setCursor(7, 1);
    lcd.print(Typ[ityp]);
   }
    else {
    lcd.setCursor(2,1);
    lcd.print(":    "); 
   }

 }

void clearDisplay() {
    lcd.setCursor(0, 0);
    lcd.print("                    "); 
    lcd.setCursor(0, 1);
    lcd.print("                    "); 
    lcd.setCursor(0, 2);
    lcd.print("                    "); 
    lcd.setCursor(0, 3);
    lcd.print("                    "); 
}

void setDisplay_Flug0() {
    clearDisplay();
    lcd.setCursor(0, 0);
    lcd.print("Pilot ");
    lcd.setCursor(5,0);
    lcd.print(":"); 
    lcd.setCursor(7, 0);
    lcd.print(Pilot[ipilot]);
    lcd.setCursor(0, 1);
    lcd.print("Co   ");
    lcd.setCursor(5,1);
    lcd.print(":"); 
    lcd.setCursor(7, 1);
    lcd.print(Typ[ityp]);
    az_mode =1;
}

void setDisplay_Flug1() {
    clearDisplay();
    lcd.setCursor(0, 0);
    lcd.print(Pilot[ipilot]);

    String s1 = Typ[ityp];
    lcd.setCursor(16,0);
    lcd.print(s1.substring(0,4));
    az_mode =0;
//    lcd.print(Wartung[iwartung]);
}

void clearDisplay(int s, int z) {
    lcd.setCursor(s,z);
    lcd.print(' ');
 
}

void nextMode() {
  switch (mode) {
    case SET_PILOT:
      mode = SET_TYP;
      break;

    case SET_TYP:
      mode = SET_PILOT;
      break;

  }
}

void updateValue(int delta) {
  switch (mode) {
    case SET_PILOT:
      ipilot = constrain(ipilot + delta, 0, sizeof(Pilot)/2-1);
      break;

    case SET_TYP:
      ityp = constrain(ityp + delta, 0,  sizeof(Typ)/2-1);
      break;
  }
}

void setStart_Stop() {
    lcd.setCursor(0, 3);
    lcd.print(start);  
}

void setup()
{
  pinMode(ENCODER_SW, INPUT_PULLUP);
  pinMode(BTN_1, INPUT_PULLUP);
  pinMode(BTN_2, INPUT_PULLUP);
  pinMode(LED_BUILTIN, OUTPUT);

  pinMode(ENCODER_CLK, INPUT);
  pinMode(ENCODER_DT, INPUT);
//  attachInterrupt(digitalPinToInterrupt(ENCODER_CLK), readEncoder, FALLING);

  lcd.init();                      // initialize the lcd
  lcd.backlight();
  setDisplay_Flug0();
}

//************************************************************
long int modeLastChanged = millis();
long int wait_short = 100;
long int wait_long = 500;

int prevClk = HIGH;

int btn_0 = 0;


void loop() {

  if (digitalRead(ENCODER_SW) == LOW && btn_0 == 0) {
    modeLastChanged = millis();
    btn_0 = 1;
  }
  if (digitalRead(ENCODER_SW) == LOW && millis()  - modeLastChanged > wait_long && btn_0 == 1) {
    btn_0 = 2;
    setDisplay_Flug0();
  }
  if (digitalRead(ENCODER_SW) == HIGH && millis() - modeLastChanged < wait_long && btn_0 == 1) {
    btn_0=0; 
    nextMode();
    updateDisplay(); 
  }
  if (digitalRead(ENCODER_SW) == HIGH && btn_0 == 2) {
    btn_0=0;
  }

    lcd.setCursor(0, 3);
    lcd.print(az_mode);  



  int clk = digitalRead(ENCODER_CLK);
  if (clk != prevClk && clk == LOW) {
    int dt = digitalRead(ENCODER_DT);
    int delta = dt == HIGH ? 1 : -1;
    updateValue(delta);
    updateDisplay();
  }
  prevClk = clk;

  int bt1 = digitalRead((BTN_1));
    if (bt1 == LOW) {
      setDisplay_Flug1();
      delay (100);
    }
 
  int bt2 = digitalRead((BTN_2));
    if (bt2 != bt2_0) {
      start = bt2 ;
      bt2_0 = bt2;
      setStart_Stop();
    }
  }