#include "qrcode.h"
const int QRcode_Version = 6;   //  set the version (range 1->40)
const int QRcode_ECC = 0;       //  set the Error Correction level (range 0-3) or symbolic (ECC_LOW, ECC_MEDIUM, ECC_QUARTILE and ECC_HIGH)

QRCode qrcode;                  // Create the QR code

#include <U8g2lib.h>

// U8g2 Contructor List for Frame Buffer Mode.
// This uses the Hardware I2C peripheral on ESP8266 with DMA interface
// The complete list is available here: https://github.com/olikraus/u8g2/wiki/u8g2setupcpp
U8G2_SSD1306_128X64_NONAME_F_HW_I2C u8g2(U8G2_R0, /* reset=*/ U8X8_PIN_NONE);

#define Lcd_X  128
#define Lcd_Y  64

void setup() {
  Serial.begin(115200);

  u8g2.begin();
  u8g2.clearBuffer();

  u8g2.setContrast(220);    // set OELD brightness(0->255)

  //u8g2.setFont(u8g2_font_ncenB12_tr );  // 12 pixel height
  //u8g2.setFont(u8g2_font_ncenB08_tr);  // 8 pixel height
  //u8g2.setFont(u8g2_font_9x15_tf );  // 10 pixel height
  u8g2.setFont(u8g2_font_6x13_te );  // 9 pixel height

  u8g2.drawStr(0, 12, "Generating QR Code"); // write something to the internal memory
  u8g2.sendBuffer();          // transfer internal memory to the display

  // Start time
  uint32_t dt = millis();

  //--------------------------------------------
  // Allocate memory to store the QR code.
  // memory size depends on version number
  uint8_t qrcodeData[qrcode_getBufferSize(QRcode_Version)];

  //--------------------------------------------
  //configure the text string to code
  // qrcode_initText(&qrcode, qrcodeData, QRcode_Version, QRcode_ECC, "{\"a\":\"DE6os4N86ef9bba6kVGurqxmhpBHKctoxY\"}"); //dARK address
  //qrcode_initText(&qrcode, qrcodeData, QRcode_Version, QRcode_ECC, "DE6os4N86ef9bba6kVGurqxmhpBHKctoxY");   //dARK address
  qrcode_initText(&qrcode, qrcodeData, QRcode_Version, QRcode_ECC, "ark:AePNZAAtWhLsGFLXtztGLAPnKm98VVC8tJ?amount=20.3");    //ARK address

  //  qrcode_initText(&qrcode, qrcodeData, QRcode_Version, QRcode_ECC, "hello pj");
  //qrcode_initText(&qrcode, qrcodeData, QRcode_Version, QRcode_ECC, "1BGJvqAuZvr23EixA65PEe5PMLAjVTeyMn");     //bitcoin address

  //--------------------------------------------
  // Print Code Generation Time
  dt = millis() - dt;
  Serial.print("QR Code Generation Time: ");
  Serial.print(dt);
  Serial.print("\n");

  //--------------------------------------------
  //    This prints the QR code to the serial monitor as solid blocks. Each module
  //    is two characters wide, since the monospace font used in the serial monitor
  //    is approximately twice as tall as wide.
  // Top quiet zone
  Serial.print("\n\n\n\n");
  for (uint8_t y = 0; y < qrcode.size; y++) {
    // Left quiet zone
    Serial.print("        ");
    // Each horizontal module
    for (uint8_t x = 0; x < qrcode.size; x++) {
      // Print each module (UTF-8 \u2588 is a solid block)
      Serial.print(qrcode_getModule(&qrcode, x, y) ? "\u2588\u2588" : "  ");
    }
    Serial.print("\n");
  }
  // Bottom quiet zone
  Serial.print("\n\n\n\n");

  //--------------------------------------------
  //display generation time to OLED display
  u8g2.drawStr(0, 30, "Generation Time(ms)"); // write something to the internal memory
  u8g2.setCursor(0, 50);
  u8g2.print(dt);             // display time it took to generate code
  u8g2.sendBuffer();
  delay(3000);

  //--------------------------------------------
  //Turn on all pixels
  for (uint8_t y = 0; y < 63; y++) {
    for (uint8_t x = 0; x < 127; x++) {
      u8g2.setDrawColor(1);       //change 0 to make QR code with black background
      u8g2.drawPixel(x, y);
    }
  }


  //uint8_t x0 = (Lcd_X - qrcode.size) / 2;
  //uint8_t y0 = (Lcd_Y - qrcode.size) / 2;

  //--------------------------------------------
  //setup the top left corner of the QRcode
  uint8_t x0 = 40;
  uint8_t y0 = 10;   //16 is the start of the blue portion OLED in the yellow/blue split 64x128 OLED

  //--------------------------------------------
  //display QRcode
  for (uint8_t y = 0; y < qrcode.size; y++) {
    for (uint8_t x = 0; x < qrcode.size; x++) {

      if (qrcode_getModule(&qrcode, x, y) == 0) {     //change to == 1 to make QR code with black background
        u8g2.setDrawColor(1);

        //uncomment to display code in normal size
           u8g2.drawPixel(x0 + x, y0 + y);

        //uncomment to double the QRcode
        //u8g2.drawPixel(x0 + 2 * x,     y0 + 2 * y);
       // u8g2.drawPixel(x0 + 2 * x + 1, y0 + 2 * y);
        //u8g2.drawPixel(x0 + 2 * x,     y0 + 2 * y + 1);
        //u8g2.drawPixel(x0 + 2 * x + 1, y0 + 2 * y + 1);


      } else {
        u8g2.setDrawColor(0);

        //uncomment to display code in normal size
          u8g2.drawPixel(x0 + x, y0 + y);

        //uncomment to double the QRcode
        //u8g2.drawPixel(x0 + 2 * x,     y0 + 2 * y);
        //u8g2.drawPixel(x0 + 2 * x + 1, y0 + 2 * y);
        //u8g2.drawPixel(x0 + 2 * x,     y0 + 2 * y + 1);
        //u8g2.drawPixel(x0 + 2 * x + 1, y0 + 2 * y + 1);
      }

    }
  }
  u8g2.sendBuffer();


}

void loop() {

  delay(6000);
  u8g2.setContrast(1);    //dim display


}