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

// Initialize for SH1107 128x128 I2C
// Format: U8G2_SH1107_128X128_F_HW_I2C u8g2(Rotation, [reset], [clock], [data])
U8G2_SH1107_128X128_F_HW_I2C u8g2(U8G2_R0, /* reset=*/ U8X8_PIN_NONE);

const int BUTTON_PIN = 13;
bool botMode = false;
unsigned long lastTick = 0;

// Variables
int h = 4, m = 41, s = 0;
float btcPrice = 64250.0;

void setup() {
  u8g2.begin();
  pinMode(BUTTON_PIN, INPUT_PULLUP);
}

void loop() {
  // Update Time and Simulation
  if (millis() - lastTick >= 1000) {
    lastTick = millis();
    s++;
    if(s > 59) { s = 0; m++; }
    if(m > 59) { m = 0; h++; }
    if(h > 23) { h = 0; }
    btcPrice += (random(-100, 101) / 10.0);
  }

  // Toggle Mode
  if (digitalRead(BUTTON_PIN) == LOW) {
    botMode = !botMode;
    delay(300); 
  }

  u8g2.clearBuffer();					
  u8g2.setFont(u8g2_font_ncenB08_tr);	

  if (!botMode) {
    // --- WATCH FACE ---
    u8g2.drawStr(40, 20, "WATCH");
    u8g2.setFont(u8g2_font_logisoso24_tn);
    
    char timeStr[9];
    sprintf(timeStr, "%02d:%02d:%02d", h, m, s);
    u8g2.drawStr(10, 75, timeStr);
    
    u8g2.setFont(u8g2_font_ncenB08_tr);
    u8g2.drawStr(25, 110, "Press to Trade");
  } 
  else {
    // --- BOT FACE ---
    u8g2.drawStr(0, 20, "BTC/EUR BOT");
    u8g2.setFont(u8g2_font_logisoso16_tf);
    u8g2.setCursor(0, 60);
    u8g2.print(btcPrice, 1);
    
    u8g2.setFont(u8g2_font_ncenB08_tr);
    u8g2.setCursor(0, 90);
    u8g2.print("Investment: 100 EUR");
    u8g2.setCursor(0, 110);
    u8g2.print("PnL: ");
    u8g2.print(btcPrice - 64250.0);
  }

  u8g2.sendBuffer();					
}