#include <WiFi.h>
#include "ThingSpeak.h"
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <random>


#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64

const float BETA = 3950; // Beta Coefficient of the thermistor

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

const int TEMP_PIN = 14; // Analog pin connected to the NTC thermistor
const char* WIFI_NAME = "Wokwi-GUEST";
const char* WIFI_PASSWORD = "";
const int myChannelNumber = 2509275;
const char* myApiKey = "PCCKG8E5JMBCT10S";
const char* server = "api.thingspeak.com";

WiFiClient client;

void setup() {
  Serial.begin(115200);
  WiFi.begin(WIFI_NAME, WIFI_PASSWORD);

  while (WiFi.status() != WL_CONNECTED){
    delay(1000);
    Serial.println("WiFi not connected");
  }

  Serial.println("WiFi connected!");
  Serial.println("Local IP: " + String(WiFi.localIP()));
  WiFi.mode(WIFI_STA);
  ThingSpeak.begin(client);

  if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { 
    Serial.println(F("SSD1306 allocation failed"));
    for(;;);
  }

  display.display();
  delay(2000);
  display.clearDisplay();
}

void loop() {
  int temp = analogRead(TEMP_PIN);

  std::random_device rd;
  std::mt19937 gen(rd()); 

  int min = -24;
  int max = 80;

  std::uniform_int_distribution<int> dist(min, max);

    // Generate a random integer
  int celsius = dist(gen);


  ThingSpeak.setField(1, celsius);

  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(0, 0);
  display.print("Temp: ");
  display.println(celsius);
  display.display();

  int x = ThingSpeak.writeFields(myChannelNumber, myApiKey);
  Serial.println("Temp: " + String(celsius) + "°C");

  if (x == 200) {
    Serial.println("Data pushed successfully");
  } else {
    Serial.println("Push error: " + String(x));
  }

  Serial.println("---");
  delay(10000);
}