#include <U8g2lib.h>
#include <Adafruit_SSD1306.h>
#include <Adafruit_GFX.h>

#define ldr A7
int buttonPin = 2; // Digital pin where the button is connected.
int ledPin = 13;   // Digital pin where the LED is connected.
bool buttonState = false;
const int blinkInterval = 200;
unsigned long statusTimer = millis();

#define ALIGN_CENTER(t) ((128 - u8g2.getUTF8Width(t) )/ 2)
#define ALIGN_LEFT 0


U8G2_SH1106_128X64_NONAME_F_HW_I2C u8g2(U8G2_R0, /* reset=*/ U8X8_PIN_NONE);

volatile int encoderPos = 0;
int lastEncoderPos = 0;
unsigned long lastInterruptTime = 0;
unsigned long debounceDelay = 20; // Vertraging tegen debouncing


int item_selected = 0; // which item in the menu is selected
int currentPage = 0; // เพจปัจจุบัน


bool  speedTeststatus = false;
bool  breakInrun = false;
bool  pauseState = false;

void setup() {
u8g2.begin();
  Serial.begin(9600);
  u8g2.setPowerSave(0);
  pinMode(ledPin, OUTPUT);    // LED pin as an output.
  pinMode(buttonPin, INPUT);  // Button pin as an input.
  pinMode(ldr, INPUT);

  
}


void loop() {
  u8g2.clearBuffer(); // required for page drawing mode for u8g2 library
  u8g2.setBitmapMode(0);  
  u8g2.setFont(u8g2_font_courB08_tr);

  u8g2.firstPage();  
  do {
      switch (currentPage) {
        case 0: //Speed Test UI
        mainUI();
        battDisplay();
        speedTestUI();
        testRun();

        break;
      }
      u8g2.sendBuffer(); // send buffer from RAM to display controller

  } while ( u8g2.nextPage() );
}
void mainUI() {
        u8g2.setFont(u8g2_font_helvB08_tr);
        u8g2.setDrawColor(1);
        u8g2.drawStr(2,11,"nerdRUNNER");
        u8g2.drawBox(104, 4, 2, 4);
        u8g2.drawRFrame(106, 1, 18, 10, 2);
        
        u8g2.drawBox(0,13,84,25);
        u8g2.drawBox(85,13,40,25);
        u8g2.drawBox(0,39,84,25);
        u8g2.drawBox(85,39,40,25);
        u8g2.setFont(u8g2_font_helvB08_tr);
        u8g2.setDrawColor(0);
        u8g2.drawStr(3,32,"RPM");
        u8g2.drawStr(3,58,"Torque");
        u8g2.drawStr(114,32,"V");
        u8g2.drawStr(114,58,"A");

        u8g2.setFont(u8g2_font_helvB12_tr);
        //u8g2.drawStr(33,32,"30000");
        u8g2.drawStr(90,32,"3.0");
        u8g2.drawStr(45,58,"2.0");
        u8g2.drawStr(90,58,"1.5");
}

void speedTestUI() {
        unsigned int RPM_data = analogRead(ldr);
        int RPM_out = RPM_data * 10 ;
        String RPM_s = String(RPM_out);

        u8g2.setFont(u8g2_font_helvB12_tr);
        u8g2.setDrawColor(0);
        u8g2.drawStr(ALIGN_CENTER(String(RPM_out).c_str())-13 ,32, "30000");
}

void battDisplay() {
  //int sensorValue = analogRead(A0); // อ่านค่าแรงดันจากขาอะนาล็อก A0
  //float voltage = sensorValue * (5.0 / 1023.0); // แปลงค่า ADC เป็นแรงดันไฟฟ้า
  //int battPercent = (voltage / 3.7) * 100; // แปลงแรงดันไฟฟ้าเป็นเปอร์เซ็นต์แบตเตอรี่
  int battPercent = 100;
  u8g2.setDrawColor(1);

  if (battPercent > 100) battPercent = 100; // แก้ไขค่าเกิน 100%
  if (battPercent < 0) battPercent = 0; // แก้ไขค่าต่ำกว่า 0%
  //u8g2.drawRFrame(106, 1, 18, 10, 2);
  if (battPercent > 0) {
    u8g2.drawBox(108, 3, 4, 6); // วาดกล่องแรก (0% to 32%)
  } 
  if (battPercent > 32) {
    u8g2.drawBox(113, 3, 4, 6); // วาดกล่องที่สอง (33% to 65%)
  } 
  if (battPercent > 65) {
    u8g2.drawBox(118, 3, 4, 6); // วาดกล่องที่สาม (66% to 100%)
  }
}
void testRun() {
  buttonState = digitalRead(buttonPin);

  // Check if the button is pressed
  if (buttonState == HIGH){
    digitalWrite(ledPin, HIGH);   // Turn LED on.

    if(millis()-statusTimer >=blinkInterval){
      u8g2.setDrawColor(1);
      u8g2.setFont(u8g2_font_9x15_t_symbols);
      u8g2.drawGlyph(92, 11, 0x25b8);     

      statusTimer=millis();
      }
      //Test Run
  } else {
    digitalWrite(ledPin, LOW);    // Turn LED off.
  }

}