#include <Arduino.h>
#include <U8g2lib.h>

#ifdef U8X8_HAVE_HW_SPI
#include <SPI.h>
#endif
#ifdef U8X8_HAVE_HW_I2C
#include <Wire.h>
#endif

int progress, total;
U8G2_SSD1306_128X64_NONAME_F_HW_I2C u8g2(U8G2_R0, /* rest= */ U8X8_PIN_NONE, /* clock= */ 22, /* data= */ 21);

/*void setup(void) {
  Serial.begin(115200);
  u8g2.begin();
  progress = 78, total = 100;
  }
*/
// This example shows a scrolling text.
// If U8G2_16BIT is not set (default), then the pixel width of the text must be lesser than 128
// If U8G2_16BIT is set, then the pixel width an be up to 32000


u8g2_uint_t offset;			// current offset for the scrolling text
u8g2_uint_t width;			// pixel width of the scrolling text (must be lesser than 128 unless U8G2_16BIT is defined
const char *text = "U8g2 ";	// scroll this text from right to left


void setup(void) {

  /* U8g2 Project: SSD1306 Test Board */
  //pinMode(10, OUTPUT);
  //pinMode(9, OUTPUT);
  //digitalWrite(10, 0);
  //digitalWrite(9, 0);

  /* U8g2 Project: T6963 Test Board */
  //pinMode(18, OUTPUT);
  //digitalWrite(18, 1);

  /* U8g2 Project: KS0108 Test Board */
  //pinMode(16, OUTPUT);
  //digitalWrite(16, 0);

  u8g2.begin();

  u8g2.setFont(u8g2_font_helvB18_tr);	// set the target font to calculate the pixel width

  width = u8g2.getUTF8Width(text);		// calculate the pixel width of the text

  u8g2.setFontMode(0);		// enable transparent mode, which is faster

  // draw the constant part of the screen
  // this will not be overwritten later
  u8g2.firstPage();
  do {
    u8g2.drawUTF8(18, 20, "[ U8g2 ]"); 		// This part will stay constantly on the screen
  } while ( u8g2.nextPage() );

}

void drawText(void) {
  u8g2_uint_t x = offset;
  do {								// repeated drawing of the scrolling text...
    u8g2.drawUTF8(x, 19, text);			// draw the scolling text
    x += width;						// add the pixel width of the scrolling text
  } while ( x < u8g2.getDisplayWidth() );		// draw again until the complete display is filled
}


void loop(void) {
  int i;

  // write the scrolling text to the lower part of the display
  for ( i = 0; i < 3; i++ )
  {
    // draw to lines 0...23 (3*8-1)
    // draw to the upper part of the screen
    u8g2.setBufferCurrTileRow(i);
    u8g2.clearBuffer();
    drawText();

    // but write the buffer to the lower part (offset 4*8 = 32)
    u8g2.setBufferCurrTileRow(4 + i);
    u8g2.sendBuffer();
  }


  // calculate the new offset for the scrolling
  offset -= 1;							// scroll by one pixel
  if ( (u8g2_uint_t)offset < (u8g2_uint_t) - width )
    offset = 0;							// start over again

  delay(10);							// do some small delay
}

/*
  void loop(void) {
  //u8g2.clearBuffer();					// clear the internal memory
  //u8g2.setFont(u8g2_font_ncenB08_tr);	// choose a suitable font
  //u8g2.drawStr(0, 10, "Hello World!");	// write something to the internal memory
  // u8g2.sendBuffer();					// transfer internal memory to the display
  //delay(1000);
  if (progress) progress--;
  else progress = 100;
  Serial.printf("Progress: %u%%\r", progress / (total / 100));
   u8g2.firstPage();
    do {
    u8g2.drawRFrame(0, 0, 88, 48, 3);
    u8g2.setFont(u8g2_font_6x10_tr);
    u8g2.setFontPosTop();
    u8g2.drawStr(0, 0, "SW Updating!");
    } while (u8g2.nextPage());
    delay(2000);
  u8g2.firstPage();
  do {
    u8g2.drawRFrame(0, 0, 88, 48, 3);
    u8g2.setFont(u8g2_font_6x10_tr);
    u8g2.setFontPosTop();
    //u8g2.drawStr(0, 0, "SW Updating!");
    u8g2.drawStr(0, 0, "Connection");
    u8g2.drawStr(0, 12, "Failed!");
    u8g2.drawFrame(4, 20, 80, 8);
    u8g2.drawBox(5, 21, map(progress / (total / 100), 0, 100, 0, 78), 6);
    u8g2.setCursor(0, 36);
    u8g2.printf("%d%%", progress / (total / 100));
    //u8g2.print(F("%"));
  } while (u8g2.nextPage());
  delay(1000);
  //ESP.restart();

    u8g2.firstPage();
    do {
    u8g2.drawRFrame(0, 0, 88, 48, 3);
    u8g2.setFont(u8g2_font_6x10_tr);
    u8g2.setFontPosTop();
    u8g2.drawStr(0, 36, "Restarting!");
    } while (u8g2.nextPage());
    delay(2000);
  }
*/