/* * Assignment: Homework 2 - ESP32 Input & Output & Analog with Blynk
 * Name: Yan Lin Tun
 * ID: 6530092
 * [cite: 2, 4]
 */

#define BLYNK_TEMPLATE_ID "TMPL6AcgGNKyX"
#define BLYNK_TEMPLATE_NAME "Hw2ESP32"
#define BLYNK_AUTH_TOKEN "Zk_WnzvYc7gjDUWDxSh4tnvkCATJLoW"

#include <WiFi.h>
#include <WiFiClient.h>
#include <BlynkSimpleEsp32.h>
#include <TaskScheduler.h>

// User-selected GPIO pins based on your Wokwi diagram [cite: 115, 116, 117]
const int ledPin = 0;    // LED1 [cite: 115]
const int sw1Pin = 1;    // SW1 [cite: 116]
const int sw2Pin = 2;    // SW2 [cite: 116]
const int analogPin = 3; // POT (ADC0 / VP pin) [cite: 117]

// Filtering Variables (Your original logic)
int val = 0;
const int windowSize = 5;
float readings[windowSize];
int indexCount = 0;
bool bufferFull = false;

void t1Callback();
Task t1(1000, TASK_FOREVER, &t1Callback);
Scheduler runner;

// This function runs when the Blynk App "LED" button (V3) is toggled [cite: 114, 132]
BLYNK_WRITE(V3) {
  int pinValue = param.asInt(); 
  digitalWrite(ledPin, pinValue);
}

void setup() {
  Serial.begin(115200);
  
  // Pin Configuration [cite: 115, 116]
  pinMode(ledPin, OUTPUT);
  pinMode(sw1Pin, INPUT_PULLUP);
  pinMode(sw2Pin, INPUT_PULLUP);

  // Initialize Blynk with Wokwi's virtual WiFi [cite: 118, 119]
  Blynk.begin(BLYNK_AUTH_TOKEN, "Wokwi-GUEST", "");

  // Scheduler Setup
  runner.init();
  runner.addTask(t1);
  t1.enable();
  
  // Clear filter data [cite: 121]
  for (int i = 0; i < windowSize; i++) readings[i] = 0.0;
}

void loop() {
  Blynk.run();    // Process Blynk events
  runner.execute(); // Process Scheduler tasks
}

void t1Callback() {
  // 1. Read Analog and Filter (Soil Moisture logic) [cite: 121]
  val = analogRead(analogPin);
  
  // Map 12-bit ADC (0-4095) to 0-100% for the Blynk Gauge [cite: 121, 122]
  float moisture = (float)val * 100.0 / 4095.0; 
  
  readings[indexCount] = moisture; 
  indexCount++;
  if (indexCount >= windowSize) {
    indexCount = 0;
    bufferFull = true;
  }
  
  float filteredMoisture = getMovingAverage();
  
  // Send filtered value to Blynk "Soil Moisture" Gauge (V2) [cite: 122, 137]
  Blynk.virtualWrite(V2, filteredMoisture);
  
  // 2. Send Switch Status to Blynk (V0 and V1) [cite: 123, 135, 136]
  // INPUT_PULLUP is LOW when pressed, so we invert it for Blynk LED widgets
  Blynk.virtualWrite(V0, !digitalRead(sw1Pin)); 
  Blynk.virtualWrite(V1, !digitalRead(sw2Pin));

  // Debugging to Serial Monitor
  Serial.print("Raw: ");
  Serial.print(val);
  Serial.print(" | Filtered Moisture: ");
  Serial.println(filteredMoisture);
}

// Your Moving Average function [cite: 121]
float getMovingAverage() {
  float sum = 0;
  int count = bufferFull ? windowSize : indexCount;
  for (int i = 0; i < count; i++) {
    sum += readings[i];
  }
  return (count > 0) ? sum / count : 0;
}