// #include <u8g2lib.h>
#include <U8g2lib.h>
#include <Wire.h>


U8G2_SSD1306_128X64_NONAME_F_SW_I2C u8g2(U8G2_R0, /* clock=*/ SCL, /* data=*/ SDA, /* reset=*/ -1);   // All Boards without Reset of the Display


//**************************************************************************
//*********** REAL PROGRAM *************************************************
//**************************************************************************


int draw_state = 0;

void statusDisp(String strOne /*value*/, String strThree/*unit*/) {


  u8g2.setFont( u8g2_font_fub25_tn);
  u8g2.drawStr(45, 36, strOne.c_str());
  u8g2.setFont(u8g2_font_6x10_tf);
  u8g2.drawStr( 45 , 60 , strThree.c_str() );
  u8g2.setDrawColor(1);


}


void infoDisplay(uint8_t index, float hrate, float spo2, float tempc){

float hstatus = 1 - ((abs(hrate - 100) / hrate) + (abs(spo2 - 97.5) / spo2) + (abs(tempc - 36.85) / tempc));
String hrStr;
 switch(index){

  case 0: 
    hrStr = String((int)hrate);
    statusDisp(hrStr, "Bpm") ;
    // u8g2.setFont(u8g2_font_unifont_t_symbols);
    u8g2.drawUTF8(114, 36, "h");
    break;

  case 1: 
    hrStr = String((int)spo2);
    statusDisp(hrStr, " ") ;
    // u8g2.setFont(u8g2_font_unifont_t_symbols);
    u8g2.drawUTF8(114, 36, "%");
    break;
  case 2: 
    hrStr = String((int)tempc);
    statusDisp(hrStr, "Celcius");
    // u8g2.setFont(u8g2_font_unifont_t_symbols);
    u8g2.drawUTF8(114, 36, "°");
    break;
  case 3: 
    float hstatus = 1 - ((abs(hrate - 100) / hrate) + (abs(spo2 - 97.5) / spo2) + (abs(tempc - 36.85) / tempc));
    hrStr = String( (int)(hstatus* 100));
    if(hstatus >0.8){
      statusDisp(hrStr,  "Excellent" );    
      u8g2.drawUTF8(114, 36, "%");
    }
    else if(hstatus > 0.6){
      statusDisp(hrStr,  "Good");
      u8g2.drawUTF8(114, 36, "%");
    }
    else if(hstatus > 0.4){
      statusDisp(hrStr,  "Normal");
      u8g2.drawUTF8(114, 36, "%");
     }
    else if(hstatus > 0.2){
      statusDisp(hrStr,  "Bad");
      u8g2.drawUTF8(114, 36, "%");
  }
    else{
      statusDisp(hrStr,  "Need attention!");
      u8g2.drawUTF8(114, 36, "%");
  }
    break;
 

  default:  
      hrStr = String((int)hrate); break;
      statusDisp(" ", " ");

 }


}










class Menu {       // The class
public:             // Access specifier
  uint8_t tabWidth = 40;
  bool active = false;
  String options[4] = { "Hrate", "Oxyg", "Temp", "Stat"};
  uint8_t style = 0 ;// 0x00 => bottom, 0x01 =>leftVertical, 0x02 =>rightVertical, 0x03 =>top

};


Menu thisMenu;

void preset(void){
  u8g2.setFont(u8g2_font_6x10_tf);
  u8g2.setFontRefHeightExtendedText();
  u8g2.drawRFrame(0, 0, 40, 15, 3);
  u8g2.drawStr( 4 , 12 , thisMenu.options[0].c_str());
  u8g2.drawRFrame(0, 16, 40, 15, 3);
  u8g2.drawStr( 4 ,  1 * 16 + 12 , thisMenu.options[1].c_str());
  u8g2.drawRFrame(0, 32, 40, 15, 3);
  u8g2.drawStr( 4 , 2 * 16 + 12 , thisMenu.options[2].c_str());
  u8g2.drawRFrame(0, 48, 40, 15, 3);
  u8g2.drawStr( 4 , 3 * 16 + 12 , thisMenu.options[3].c_str());
  u8g2.drawRFrame(41, 0, 87, 64, 5);
}


void menuinit(int selector){
  // u8g2.setFont(u8g2_font_unifont_t_symbols);
  // u8g2.setFont(u8g2_font_5x8_f);
  u8g2.setFont(u8g2_font_6x10_tf);
  u8g2.setFontRefHeightExtendedText();

  u8g2.drawRBox(0, selector * 16, 40, 16, 3);
  u8g2.setDrawColor(0);

  u8g2.drawStr( 4 , selector * 16 + 12 , thisMenu.options[selector].c_str());
  u8g2.setDrawColor(1);

}



void menuShow(){
 thisMenu.active = true;
}

void menuHide(){
thisMenu.active = false;
}

void toggleMenu(){
  thisMenu.active = !(thisMenu.active);
}








void setup(void) {
  u8g2.begin();
  u8g2.setDrawColor(1);

  
}

void loop(void) {
  // menu loop  
  u8g2.clearBuffer();
  preset();
  menuinit(draw_state);
  float hrate = random( 70, 110) ;
  float spo2 = random( 80, 99);
  float tempc = random( 34, 40);
  infoDisplay( draw_state, hrate, spo2, tempc);
  u8g2.sendBuffer();
  
  // increase the state
  draw_state++;
  if ( draw_state >= 4 )
    draw_state = 0;

  // deley between each page
  delay(2000);

}