#include <LiquidCrystal_I2C.h>
#include <ArduinoJson.h>
#include <HttpClient.h> // Include the HttpClient library

const int potPin = A0;
const int chargingPin = 2;
const int fullyChargedPin = 3;

LiquidCrystal_I2C lcd(0x27, 16, 2);

int batteryPercentage = 1;
float electricPower = 0.0;
float timeRemaining = 0.0;

#define JSON_BUFFER_SIZE 200
StaticJsonDocument<JSON_BUFFER_SIZE> jsonDocument;
char jsonString[JSON_BUFFER_SIZE];

// Create an instance of the HttpClient class
HttpClient http;

void setup() {
  pinMode(potPin, INPUT);
  pinMode(chargingPin, OUTPUT);
  pinMode(fullyChargedPin, OUTPUT);

  Serial.begin(9600);

  lcd.begin(16, 2);
  lcd.print("EV Charging Sim");
}

void loop() {
  // Simulate battery charging based on electric power applied
  electricPower = map(analogRead(potPin), 0, 1023, 0, 10); // Scale potentiometer reading to a range of 0 to 10

  // Calculate expected time remaining to complete charging
  timeRemaining = (100 - batteryPercentage) / electricPower;

  // Update battery percentage and check for fully charged
  batteryPercentage += electricPower;
  batteryPercentage = constrain(batteryPercentage, 0, 100);

  // Update the JSON data
  jsonDocument.clear();
  jsonDocument["batteryPercentage"] = batteryPercentage;
  jsonDocument["electricPower"] = electricPower;
  jsonDocument["timeRemaining"] = timeRemaining;

  // Serialize JSON data
  serializeJson(jsonDocument, jsonString, sizeof(jsonString));

  // Send JSON data via Serial
  Serial.println(jsonString);

  // Update the display
  updateDisplay();

  // Simulate charging completion
  if (batteryPercentage >= 100) {
    digitalWrite(chargingPin, LOW); // Turn off charging indicator
    digitalWrite(fullyChargedPin, HIGH); // Turn on fully charged indicator
  } else {
    digitalWrite(chargingPin, HIGH); // Turn on charging indicator
    digitalWrite(fullyChargedPin, LOW); // Turn off fully charged indicator
  }

  // Send data to server via HTTP POST
  sendHttpPost(jsonString);

  delay(1000); // Adjust this delay to control how often the values update (in milliseconds)
}

void updateDisplay() {
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Battery: ");
  lcd.print(batteryPercentage);
  lcd.print("%");

  lcd.setCursor(0, 1);
  lcd.print("Power: ");
  lcd.print(electricPower);
  lcd.print(" kW");

  lcd.setCursor(10, 1);
  lcd.print("ETA: ");
  lcd.print(timeRemaining);
  lcd.print(" hrs");
}

void sendHttpPost(const char* data) {
  // Construct the HTTP POST request
  http.beginRequest();
  http.post("http://localhost:8080/api/data", "application/json", data);
  http.endRequest();
  
  // Read the response (optional)
  String response = http.responseBody();
  
  Serial.println("HTTP POST request sent.");
  Serial.print("Response: ");
  Serial.println(response);
}