// %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
//     ESP32-C3 30pin (C3 SuperMini: 16pin), connected to OLED display, latching pin for LED or 2 language select with one button  
//
//     Hardware: ESP32-C3 30pin, OLED Display 128x64 I2C,  
//     External libraries: U8g2lib.h
//     Processor selection in Arduino IDE:  ESP32 C3 Dev Module
//     I2C Hardware: pin8 (SDA) pin 9 (SCL)
//     What it does: 
//     - 
//     -  
//     to be added:     - 
//     -                - 
//     - 
//     21.02.24 last (start Feb. 2024)
// %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

#include <U8g2lib.h>                          // library for OLED, e.g. 128x64 monochrome
U8G2_SSD1306_128X64_NONAME_F_HW_I2C oled(U8G2_R0);  // for WOKWI with hardware I2C pins 8 SDA and 9 SCL

//#define SDA 8                // not Wokwi: SDA pin assigned to any GPIO pin
//#define SCL 9                // not Wokwi: SCL pin assigned to any GPIO pin
//U8G2_SSD1309_128X64_NONAME0_F_SW_I2C oled(U8G2_R0, SCL, SDA, U8X8_PIN_NONE);   // not Wokwi for small 0.96" OLED
//U8G2_SSD1309_128X64_NONAME2_F_SW_I2C u8g2(U8G2_R0, /* clock=*/ 13, /* data=*/ 11, /* reset=*/ 8);         // ============GETESTET 2.42"!!!  ==============

const int buttonPin = 5;
const int ledPin = 2;
//int buttonState = 0;                        // starting value, button not pressed
//float cursor = 3.4321;                      // variable to play with...
int arrayPointer = -1;                        // starting value for array position ( "0" is first menu item, so "-1" will start with first menu name)

String arrayStation[8] = 
{
  "Mega Shuffle",
  "WayUp Radio",
  "Asia Dream",
  "KPop Radio",
  "Classic FM",
  "Lite Favorites",
  "MAXXED Out",
  "SomaFM Xmas"
};

//const int numCh = sizeof(arrayStation)/sizeof(char *);   // ?
String station = arrayStation[arrayPointer];


void setup() 
{
  pinMode(ledPin, OUTPUT);
  pinMode(buttonPin, INPUT_PULLUP);           // pin set HIGH, goes LOW if pressed

  oled.begin();                               // begin U8g2lib.h named "oled" for OLED 128x64
  oled.clearBuffer();                         // clear buffer for storing display content in RAM
  //oled.setContrast(200);                    // brightness of OLED, 0..255
  //oled.setDrawColor(1);                     // ??? set color to white
  oled.setFont(u8g2_font_nerhoe_tr);          // set font
  oled.setCursor(0,10);
  oled.print("Switch Station with button");      // oled.print a string instead of oled.drawStr 
  oled.sendBuffer();
  delay(1000);
  /*
  oled.setFont(u8g2_font_nerhoe_tr);          // set font
  oled.setFont(u8g2_font_profont11_tr);       // set font for small digits
  oled.setFont(u8g2_font_profont10_tr);       // font for the small label, e.g. "POWER"
  */
}

void loop() 
{
  //buttonState = digitalRead(buttonPin);       // was the button pressed?

  if (digitalRead(buttonPin) ==  LOW)           // Button B defined as INPUT_PULLUP, LOW means pressed
  { digitalWrite(ledPin, HIGH);  // turn the LED on (HIGH is the voltage level)
    delay(100);                      // wait for a second
    digitalWrite(ledPin, LOW);  // turn off LED on (HIGH is the voltage level)

    oled.clearBuffer();
    arrayPointer = (arrayPointer + 1);          // raise arrayPointer (station#) by 1 -> too many characters shown, repeating name!
    //arrayPointer = (arrayPointer + 1) % numCh;  // raise arrayPointer (station#) by 1  % modulo numCh?
    if (arrayPointer > 7)                       // ... if over 7, then...
      { arrayPointer = 0; }                     // ... set to 0, restart at top of array
    station = arrayStation[arrayPointer];       // station gets next station name
    oled.setFont(u8g2_font_nerhoe_tr);          // set font
    oled.setCursor(0,10);
    oled.print("Station:");                     // oled.print a string instead of oled.drawStr 
    oled.setCursor(10,30);
    //oled.print(station);                        // oled.print a string instead of oled.drawStr 
    oled.print(arrayStation[arrayPointer]);     // oled.print a string instead of oled.drawStr 
    oled.setFont(u8g2_font_profont11_tr);       // set font for small digits
    oled.setCursor(10,50);
    oled.println(arrayPointer);                 // oled.print a variable 
    oled.setCursor(30,50);
    oled.print(sizeof(arrayStation));           // oled.print a variable 
    oled.sendBuffer();                          // send buffer from RAM to display controller
    delay(1000);
    
  }
  
}