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

#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64

#define BATTERY_PIN 34

float feg;
float sen;
float cels;
#define TEMP_PIN 35

Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

int previousBatteryLevel = 0;

void setup() {
  Serial.begin(115200);
  pinMode(BATTERY_PIN, INPUT);
  pinMode(TEMP_PIN, INPUT);

  if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("SSD1306 allocation failed"));
    for(;;);
  }
  delay(2000);
  display.clearDisplay();  // Clear the display on startup
  display.display();       // Show the cleared display
}

float convertToVoltage(int adcValue) {
  // Assuming ESP32 uses 12-bit ADC, so 2^12 = 4096
  return (adcValue / 4096.0) * 3.3;
}

int calculateBatteryPercentage(float voltage) {
  // Assuming 0V is 0% and 3.3V is 100%
  return map(voltage, 0, 3.3, 0, 100);
}

void loop() {
  sen = analogRead(TEMP_PIN);
  feg = (sen * 9.0 / 5.0) + 32.0;
  Serial.println("feg");
  Serial.println(feg);

  cels = (feg - 32.0) * 5.0 / 9.0;
  Serial.println("cel");
  Serial.println(cels);

  int batteryLevel = analogRead(BATTERY_PIN);
  float batteryVoltage = convertToVoltage(batteryLevel);
  int batteryPercentage = calculateBatteryPercentage(batteryVoltage);

  // Ensure the battery percentage is within the range 0-100
  batteryPercentage = constrain(batteryPercentage, 0, 100);

  display.clearDisplay();  // Clear the display before updating

  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setCursor(0, 0);
  display.print("Temperature:");
  display.setCursor(0, 10);
  display.println(cels);
  display.setCursor(37, 10);
  display.print("C");

  display.setCursor(0, 30);
  display.println("Temperature:");
  display.setCursor(0, 40);
  display.println(feg);
  display.setCursor(37, 40);
  display.print("F");

  int batteryHeight = map(batteryPercentage, 0, 100, 0, 28);
  int batteryX = SCREEN_WIDTH - 18;
  int batteryY = 8;
  int batteryWidth = 13;
  int batteryTopHeight = 2;
  int batteryBottomHeight = 30;

  int batteryFillHeight = map(batteryPercentage, 0, 100, 0, batteryBottomHeight);

  // Ensure that the battery fill height doesn't exceed the battery block's height
  batteryFillHeight = min(batteryFillHeight, batteryBottomHeight);

  display.drawRect(batteryX, batteryY + batteryTopHeight, batteryWidth, batteryBottomHeight, SSD1306_WHITE);
  display.fillRect(batteryX + 1, batteryY + batteryTopHeight + (batteryBottomHeight - batteryFillHeight), batteryWidth - 2, batteryFillHeight, SSD1306_WHITE);

  // Display battery percentage with limited space
  display.setCursor(110 - (batteryPercentage >= 100 ? 6 : 0), 0); // Adjusted cursor position
  display.print(String(batteryPercentage) + "%");

  // Display battery voltage for debugging purposes
  display.setCursor(0, 50);
  display.print("Voltage: ");
  display.print(batteryVoltage, 2);
  display.print("V");

  display.display();  // Show the updated display

  delay(2000);
}




/*#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64

#define BATTERY_PIN 34
float feg;
float sen;
float cels;
#define TEMP_PIN 35

Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

int previousBatteryLevel = 0;

void setup() {
  Serial.begin(115200);
  pinMode(BATTERY_PIN, INPUT);
  pinMode(TEMP_PIN, INPUT);

  if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("SSD1306 allocation failed"));
    for(;;);
  }
  delay(2000);
  display.clearDisplay();  // Clear the display on startup
  display.display();       // Show the cleared display
}

void loop() {
  sen = analogRead(TEMP_PIN);
  feg = (sen * 9.0 / 5.0) + 32.0;
  Serial.println("feg");
  Serial.println(feg);

  cels = (feg - 32.0) * 5.0 / 9.0;
  Serial.println("cel");
  Serial.println(cels);

  int batteryLevel = analogRead(BATTERY_PIN);
  int batteryPercentage = map(batteryLevel, 0, 1023, 0, 100);
  
  // Ensure the battery percentage is within the range 0-100
  batteryPercentage = constrain(batteryPercentage, 0, 100);

  display.clearDisplay();  // Clear the display before updating

  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setCursor(0, 0);
  display.print("Temperature:");
  display.setCursor(0, 10);
  display.println(cels);
  display.setCursor(37, 10);
  display.print("C");

  display.setCursor(0, 30);
  display.println("Temperature:");
  display.setCursor(0, 40);
  display.println(feg);
  display.setCursor(37, 40);
  display.print("F");

  int batteryHeight = map(batteryPercentage, 0, 100, 0, 28);
  int batteryX = SCREEN_WIDTH - 18;
  int batteryY = 8;
  int batteryWidth = 13;
  int batteryTopHeight = 2;
  int batteryBottomHeight = 30;

  display.drawRect(batteryX, batteryY + batteryTopHeight, batteryWidth, batteryBottomHeight, SSD1306_WHITE);
  int batteryFillHeight = map(batteryPercentage, 0, 100, 0, batteryBottomHeight);
  display.fillRect(batteryX + 1, batteryY + batteryTopHeight + (batteryBottomHeight - batteryFillHeight), batteryWidth - 2, batteryFillHeight, SSD1306_WHITE);

  display.setCursor(110, 0);
  display.print(String(batteryPercentage) + "%");

  if (batteryLevel > previousBatteryLevel) {
    display.setCursor(110, 40);
    
  } else if (batteryLevel < previousBatteryLevel) {
    display.setCursor(110, 40);
 
  } else {
    display.setCursor(110, 40);
   
  }

  display.display();  // Show the updated display

  previousBatteryLevel = batteryLevel;
  delay(2000);
}*/



/*#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels

#define BATTERY_PIN A0  // Analog pin connected to the battery level

// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

int previousBatteryLevel = 0;

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

  if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { // Address 0x3D for 128x64
    Serial.println(F("SSD1306 allocation failed"));
    for(;;);
  }
  delay(2000);
  display.clearDisplay();

  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setCursor(0,0);
  // Display static text
  display.print("Temperature:");
  display.setCursor(0,10);
  display.print("28.81");

  display.setCursor(37,10);
  display.print("C");

  display.display();
}

void loop() {
  int batteryLevel = analogRead(BATTERY_PIN);  // Read battery level (0-1023)
  int batteryPercentage = map(batteryLevel, 0, 1023, 0, 100);  // Map to percentage

  display.clearDisplay();

  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setCursor(0,0);
  // Display static text
  display.print("Temperature:");
  display.setCursor(0,10);
  display.print("28.81");

  display.setCursor(37,10);
  display.print("C");

  
  display.setCursor(0,30);
  // Display static text
  display.println("Temperature:");
  
  display.setCursor(0,40);
  display.println("83.86");
  display.setCursor(37,40);
  display.print("F");

  // Calculate battery level height based on batteryPercentage
  int batteryHeight = map(batteryPercentage, 0, 100, 0, 28);

  // Draw the battery shape on the right side
  int batteryX = SCREEN_WIDTH - 18;
  int batteryY = 8;
  int batteryWidth = 13;
  int batteryTopHeight = 2;
  int batteryBottomHeight = 30;

  display.drawRect(batteryX, batteryY + batteryTopHeight, batteryWidth, batteryBottomHeight, SSD1306_WHITE);

  // Fill the battery level indicator on the right side
  int batteryFillHeight = map(batteryPercentage, 0, 100, 0, batteryBottomHeight);
  display.fillRect(batteryX + 1, batteryY + batteryTopHeight + (batteryBottomHeight - batteryFillHeight), batteryWidth - 2, batteryFillHeight, SSD1306_WHITE);

  // Display battery percentage
  display.setCursor(110, 0);
  display.print(String(batteryPercentage) + "%");

  // Check if battery level is increasing or decreasing
  if (batteryLevel > previousBatteryLevel) {
    display.setCursor(110, 40);
    //display.print("Charging");
  } else if (batteryLevel < previousBatteryLevel) {
    display.setCursor(110, 40);
    //display.print("Discharging");
  } else {
    display.setCursor(110, 40);
    display.print("Stable");
  }

  display.display();

  previousBatteryLevel = batteryLevel;
  delay(2000);  // Update every 2 seconds or as needed
}*/