/************************************************************************************
 *  Created By: Tauseef Ahmad
 *  Created On: 22 August, 2022
 *  
 *  YouTube Video: https://youtu.be/lw4YRPvPzP8
 *  My Channel: https://www.youtube.com/channel/UCOXYfOHgu-C-UfGyDcu5sYw/
 *  
 *  *********************************************************************************
 *  Preferences--> Aditional boards Manager URLs : 
 *  For ESP32:
 *  https://dl.espressif.com/dl/package_esp32_index.json
 * ********************************************************************************/

//---------------------------------------------------------------------------
#include "U8glib.h"
U8GLIB_SSD1306_128X64 u8g(U8G_I2C_OPT_NONE|U8G_I2C_OPT_DEV_0);
//---------------------------------------------------------------------------
const int timezone_hours = 5;
const int timezone_minutes = 0;
//---------------------------------------------------------------------------
// #include <SoftwareSerial.h>
// #define rxPin 2
// #define txPin 3 //unused
// SoftwareSerial neogps(rxPin,txPin);

// #include <TinyGPS++.h> //1.0.3
// TinyGPSPlus gps;
//---------------------------------------------------------------------------
int x_max    = 128;       //OLED display width, in pixels
int y_max    = 62;        //OLED display width, in pixels
int x_center = x_max/2;
int y_center = y_max/2+10;
int arc      = y_max/2;
int angle    = 0;
//---------------------------------------------------------------------------
int needle_pos = 0;
u8g_uint_t xx  = 0;
//---------------------------------------------------------------------------
//satellite logo
#define sat_logo_width 20
#define sat_logo_height 20

const unsigned char sat_logo[] = {
  0x00, 0x01, 0x00, 0x80, 0x07, 0x00, 0xc0, 0x06, 0x00, 0x60, 0x30, 0x00,
  0x60, 0x78, 0x00, 0xc0, 0xfc, 0x00, 0x00, 0xfe, 0x01, 0x00, 0xff, 0x01,
  0x80, 0xff, 0x00, 0xc0, 0x7f, 0x06, 0xc0, 0x3f, 0x06, 0x80, 0x1f, 0x0c,
  0x80, 0x4f, 0x06, 0x19, 0xc6, 0x03, 0x1b, 0x80, 0x01, 0x73, 0x00, 0x00,
  0x66, 0x00, 0x00, 0x0e, 0x00, 0x00, 0x3c, 0x00, 0x00, 0x70, 0x00, 0x00
};
//---------------------------------------------------------------------------

//Program variables
double lat;
double lng;
//int day, month, year;
String hours, minutes;
int second;

int num_sat, speed;
String heading;


/*******************************************************************************************
 * gauge function
 * dispay gauge and other gps data on oled
*******************************************************************************************/
void gauge(uint8_t angle) {
  //fonts: u8g_font_chikita - u8g_font_04b_03br
  // u8g_font_orgv01 - u8g_font_freedoomr10r
  u8g.setFont(u8g_font_chikita);
  //---------------------------------------------------------------------------
  // draw border of the gauge
  u8g.drawCircle(x_center,y_center,arc+6, U8G_DRAW_UPPER_RIGHT);
  u8g.drawCircle(x_center,y_center,arc+4, U8G_DRAW_UPPER_RIGHT);
  u8g.drawCircle(x_center,y_center,arc+6, U8G_DRAW_UPPER_LEFT);
  u8g.drawCircle(x_center,y_center,arc+4, U8G_DRAW_UPPER_LEFT);
  //---------------------------------------------------------------------------
  // show gauge values
  u8g.drawStr(20,  42, "0");   
  u8g.drawStr(18,  29, "25");
  u8g.drawStr(28,  14, "50");
  u8g.drawStr(60,  14, "100");
  u8g.drawStr(91,  14, "150");
  u8g.drawStr(101, 29, "175");
  u8g.drawStr(105, 42, "200"); 
  //---------------------------------------------------------------------------
  // show gauge label
  u8g.setPrintPos(54,25);
  u8g.print("km/h");
  u8g.setPrintPos(50,32);
  u8g.print("SPEED");
  //---------------------------------------------------------------------------
  // draw the needle
  float x1=sin(2*angle*2*3.14/360);           
  float y1=cos(2*angle*2*3.14/360); 
  u8g.drawLine(x_center, y_center, x_center+arc*x1, y_center-arc*y1);
  u8g.drawDisc(x_center, y_center, 5, U8G_DRAW_UPPER_LEFT);
  u8g.drawDisc(x_center, y_center, 5, U8G_DRAW_UPPER_RIGHT);
  //---------------------------------------------------------------------------
  //TOP LEFT: draw satellite logo and number of satellites
  u8g.drawXBM(0, 0, sat_logo_width, sat_logo_height, sat_logo);
  u8g.setPrintPos(18, 5);
  u8g.print(num_sat, 5);
  //---------------------------------------------------------------------------
  //TOP RIGHT: Display direction
  u8g.setPrintPos(110, 5);
  u8g.print(heading);
  //---------------------------------------------------------------------------
  //Display latitude and longitude
  u8g.setPrintPos(0, 55);
  u8g.print(lat, 4);
  u8g.setPrintPos(0, 62);
  u8g.print(lng, 4);
  //---------------------------------------------------------------------------
  //Display time
  u8g.setFont(u8g_font_freedoomr10r);
  u8g.setPrintPos(90, 65);
  u8g.print(hours);
  
  if(second%2 == 0) 
    {u8g.drawStr(104, 65, ":");}
  else
    {u8g.drawStr(104, 65, " ");}
    
  u8g.setPrintPos(111, 65);
  u8g.print(minutes);
  
  //u8g.drawStr(90, 65, "00:00");
  //---------------------------------------------------------------------------
  // Show Speed and align its position
  u8g.setFont(u8g_font_profont22);
  u8g.setPrintPos(54,60);
  if (speed<10){                              
    u8g.print("0");
  }
  if (speed>99) {                                  
    u8g.setPrintPos(47,60);
  }
  u8g.print(speed);
  //---------------------------------------------------------------------------
}

/*******************************************************************************************
 * gauge function
 * dispay gauge and other gps data on oled
*******************************************************************************************/
int i = 200;
void setup(void) {
  Serial.begin(9600);

 // neogps.begin(9600);
  
  u8g.setFont(u8g_font_chikita);
  u8g.setColorIndex(1);
}

/*******************************************************************************************
 * gauge function
 * dispay gauge and other gps data on oled
*******************************************************************************************/
void loop(void){
  //----------------------------------------------------------
 // Read_GPS();
  //----------------------------------------------------------
  needle_pos = map(speed,0,200,0,90); //SET NEEDLE
  // show needle and dial
  xx = needle_pos;                                    
  if (xx<45)
    {xx=xx+135;}
  else
    {xx=xx-45;} 
  //----------------------------------------------------------
  //Display Data on Oled
  {
    u8g.firstPage(); 
    do {             
      gauge(xx);
    }
    while( u8g.nextPage() );
  }
  //----------------------------------------------------------
}




//void Read_GPS(){
  //------------------------------------------------------------------
  //boolean newData = false;
  //for (unsigned long start = millis(); millis() - start < 1000;)
  //{
    //while (neogps.available())
    //{
      //if (gps.encode(neogps.read()))
      //{
        //newData = true;
        //break;
      //}
    //}
  //}
  //------------------------------------------------------------------
  //If newData is true
  //if(newData == true){
    //newData = false;
    //Get_GPS();
  //}
  //else { 
    //no data
  //}
//}


//void Get_GPS(){
  //num_sat = gps.satellites.value();

  //if (gps.location.isValid() == 1) {
    //speed = gps.speed.kmph();
    //Serial.print("Speed: ");Serial.println(gps_speed);
    //lat = gps.location.lat();
    //Serial.print("lat: ");Serial.println(lat);
    //lng = gps.location.lng();
    //Serial.print("lng: ");Serial.println(lng);
    //heading = gps.cardinal(gps.course.value());
    //Serial.print("heading: ");Serial.println(heading);
  //}
  
  //if (gps.time.isValid()){
    //int hour = gps.time.hour();
    //int minute = gps.time.minute();
    //second = gps.time.second();

    //abc(hour, minute);
    
    //hours   = String(hour);
    //minutes = String(minute);
    //hours = (hours.length() == 1) ? "0"+hours : hours;
    //minutes = (minutes.length() == 1) ? "0"+minutes : minutes;
  //}
//}


void abc(int &hour, int &minute){
    Serial.println("UTC =  "+String(hour)+":"+String(minute)+":"+String(second));
    minute = minute + timezone_minutes;
    if(minute >= 60){
      minute = minute - 60;
      hour = hour + 1;
    }
    if(minute < 0){
      minute = minute + 60;
      hour = hour - 1;
    }
    hour = hour + timezone_hours;
    if(hour >= 24){
      hour = hour - 24;
    }
    else if(hour < 0){
      hour = hour + 24;
    }
    if(hour >12){
      hour = hour - 12;
    }
    Serial.println("Time=  "+String(hour)+":"+String(minute)+":"+String(second));
}