/**********************************************************************************
 *  TITLE: Blynk + Manual Button control Relays using ESP32 (Real time feedback + no WiFi control)
 *  Click on the following links to learn more. 
 *  YouTube Video: https://youtu.be/H-gkysrJjAc
 *  Related Blog : https://iotcircuithub.com/esp32-projects/
 *  by Tech StudyCell
 *  Preferences--> Aditional boards Manager URLs : 
 *  https://dl.espressif.com/dl/package_esp32_index.json, http://arduino.esp8266.com/stable/package_esp8266com_index.json
 *  
 *  Download Board ESP32 : https://github.com/espressif/arduino-esp32
 *
 *  Download the libraries 
 *  Blynk 1.0.1 Library:  https://github.com/blynkkk/blynk-library
 *  AceButton Library: https://github.com/bxparks/AceButton
 **********************************************************************************/

/* Fill-in your Template ID (only if using Blynk.Cloud) */
#define BLYNK_TEMPLATE_ID "TMPL6ylQunKTT"
#define BLYNK_TEMPLATE_NAME "Relay 4 Blynk Ukki"
#define BLYNK_AUTH_TOKEN "_uX8fg_-UtNbCZkCsONRz8fpeL49VeOk"

// Your WiFi credentials.
// Set password to "" for open networks.
char ssid[] = "Wokwi-GUEST";
char pass[] = "";

bool fetch_blynk_state = true;  //true or false

//#define BLYNK_PRINT Serial
#include <WiFi.h>
#include <WiFiClient.h>
#include <BlynkSimpleEsp32.h>
#include <AceButton.h>
using namespace ace_button;

// define the GPIO connected with Relays and switches
#define RelayPin1 26  //D23
#define RelayPin2 27  //D22
#define RelayPin3 14  //D21
#define RelayPin4 12  //D19

#define SwitchPin1 19  //D13
#define SwitchPin2 18  //D12
#define SwitchPin3 5  //D14
#define SwitchPin4 17  //D27

#define wifiLed   2   //D2

//Change the virtual pins according the rooms
#define VPIN_BUTTON_1    V1 
#define VPIN_BUTTON_2    V2
#define VPIN_BUTTON_3    V3 
#define VPIN_BUTTON_4    V4

// Relay State
bool toggleState_1 = LOW; //Define integer to remember the toggle state for relay 1
bool toggleState_2 = LOW; //Define integer to remember the toggle state for relay 2
bool toggleState_3 = LOW; //Define integer to remember the toggle state for relay 3
bool toggleState_4 = LOW; //Define integer to remember the toggle state for relay 4

int wifiFlag = 0;

char auth[] = BLYNK_AUTH_TOKEN;

ButtonConfig config1;
AceButton button1(&config1);
ButtonConfig config2;
AceButton button2(&config2);
ButtonConfig config3;
AceButton button3(&config3);
ButtonConfig config4;
AceButton button4(&config4);

void handleEvent1(AceButton*, uint8_t, uint8_t);
void handleEvent2(AceButton*, uint8_t, uint8_t);
void handleEvent3(AceButton*, uint8_t, uint8_t);
void handleEvent4(AceButton*, uint8_t, uint8_t);

BlynkTimer timer;

// When App button is pushed - switch the state

BLYNK_WRITE(VPIN_BUTTON_1) {
  toggleState_1 = param.asInt();
  digitalWrite(RelayPin1, !toggleState_1);
}

BLYNK_WRITE(VPIN_BUTTON_2) {
  toggleState_2 = param.asInt();
  digitalWrite(RelayPin2, !toggleState_2);
}

BLYNK_WRITE(VPIN_BUTTON_3) {
  toggleState_3 = param.asInt();
  digitalWrite(RelayPin3, !toggleState_3);
}

BLYNK_WRITE(VPIN_BUTTON_4) {
  toggleState_4 = param.asInt();
  digitalWrite(RelayPin4, !toggleState_4);
}

void checkBlynkStatus() { // called every 3 seconds by SimpleTimer

  bool isconnected = Blynk.connected();
  if (isconnected == false) {
    wifiFlag = 1;
    Serial.println("Blynk Not Connected");
    digitalWrite(wifiLed, LOW);
  }
  if (isconnected == true) {
    wifiFlag = 0;
    if (!fetch_blynk_state){
    Blynk.virtualWrite(VPIN_BUTTON_1, toggleState_1);
    Blynk.virtualWrite(VPIN_BUTTON_2, toggleState_2);
    Blynk.virtualWrite(VPIN_BUTTON_3, toggleState_3);
    Blynk.virtualWrite(VPIN_BUTTON_4, toggleState_4);
    }
    digitalWrite(wifiLed, HIGH);
    Serial.println("Blynk Connected");
  }
}

BLYNK_CONNECTED() {
  // Request the latest state from the server
  if (fetch_blynk_state){
    Blynk.syncVirtual(VPIN_BUTTON_1);
    Blynk.syncVirtual(VPIN_BUTTON_2);
    Blynk.syncVirtual(VPIN_BUTTON_3);
    Blynk.syncVirtual(VPIN_BUTTON_4);
  }
}

void setup()
{
  Serial.begin(9600);

  pinMode(RelayPin1, OUTPUT);
  pinMode(RelayPin2, OUTPUT);
  pinMode(RelayPin3, OUTPUT);
  pinMode(RelayPin4, OUTPUT);

  pinMode(wifiLed, OUTPUT);

  pinMode(SwitchPin1, INPUT_PULLUP);
  pinMode(SwitchPin2, INPUT_PULLUP);
  pinMode(SwitchPin3, INPUT_PULLUP);
  pinMode(SwitchPin4, INPUT_PULLUP);

  //During Starting all Relays should TURN OFF
  digitalWrite(RelayPin1, !toggleState_1);
  digitalWrite(RelayPin2, !toggleState_2);
  digitalWrite(RelayPin3, !toggleState_3);
  digitalWrite(RelayPin4, !toggleState_4);

  digitalWrite(wifiLed, LOW);

  config1.setEventHandler(button1Handler);
  config2.setEventHandler(button2Handler);
  config3.setEventHandler(button3Handler);
  config4.setEventHandler(button4Handler);
  
  button1.init(SwitchPin1);
  button2.init(SwitchPin2);
  button3.init(SwitchPin3);
  button4.init(SwitchPin4);

  //Blynk.begin(auth, ssid, pass);
  WiFi.begin(ssid, pass);
  timer.setInterval(2000L, checkBlynkStatus); // check if Blynk server is connected every 2 seconds
  Blynk.config(auth);
  delay(1000);
  
  if (!fetch_blynk_state){
    Blynk.virtualWrite(VPIN_BUTTON_1, toggleState_1);
    Blynk.virtualWrite(VPIN_BUTTON_2, toggleState_2);
    Blynk.virtualWrite(VPIN_BUTTON_3, toggleState_3);
    Blynk.virtualWrite(VPIN_BUTTON_4, toggleState_4);
  }
}

void loop()
{  
  Blynk.run();
  timer.run(); // Initiates SimpleTimer

  button1.check();
  button2.check();
  button3.check();
  button4.check();
}

void button1Handler(AceButton* button, uint8_t eventType, uint8_t buttonState) {
  Serial.println("EVENT1");
  switch (eventType) {
    case AceButton::kEventReleased:
      Serial.println("kEventReleased");
      digitalWrite(RelayPin1, toggleState_1);
      toggleState_1 = !toggleState_1;
      Blynk.virtualWrite(VPIN_BUTTON_1, toggleState_1);
      break;
  }
}
void button2Handler(AceButton* button, uint8_t eventType, uint8_t buttonState) {
  Serial.println("EVENT2");
  switch (eventType) {
    case AceButton::kEventReleased:
      Serial.println("kEventReleased");
      digitalWrite(RelayPin2, toggleState_2);
      toggleState_2 = !toggleState_2;
      Blynk.virtualWrite(VPIN_BUTTON_2, toggleState_2);
      break;
  }
}
void button3Handler(AceButton* button, uint8_t eventType, uint8_t buttonState) {
  Serial.println("EVENT3");
  switch (eventType) {
    case AceButton::kEventReleased:
      Serial.println("kEventReleased");
      digitalWrite(RelayPin3, toggleState_3);
      toggleState_3 = !toggleState_3;
      Blynk.virtualWrite(VPIN_BUTTON_3, toggleState_3);
      break;
  }
}
void button4Handler(AceButton* button, uint8_t eventType, uint8_t buttonState) {
  Serial.println("EVENT4");
  switch (eventType) {
    case AceButton::kEventReleased:
      Serial.println("kEventReleased");
      digitalWrite(RelayPin4, toggleState_4);
      toggleState_4 = !toggleState_4;
      Blynk.virtualWrite(VPIN_BUTTON_4, toggleState_4);
      break;
  }
}