#define BLYNK_TEMPLATE_ID "TMPL2YDnxYDz9"
#define BLYNK_TEMPLATE_NAME "HOME AUTOMATION"
#define BLYNK_AUTH_TOKEN "AUTH TOKEN" // Replace with your Blynk Auth Token

#include <BlynkSimpleEsp32.h>
BlynkTimer timer;

// define the GPIO connected with Relays and switches
#define RelayPin1 23  //D23
#define RelayPin2 22  //D22
#define RelayPin3 21  //D21
#define RelayPin4 19  //D19

#define SwitchPin1 13  //D13
#define SwitchPin2 12  //D12
#define SwitchPin3 14  //D14
#define SwitchPin4 27  //D27

#define wifiLed    2   //D2

#define VPIN_BUTTON_1    V1 
#define VPIN_BUTTON_2    V2
#define VPIN_BUTTON_3    V3 
#define VPIN_BUTTON_4    V4

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

int wifiFlag = 0;

#define WIFI_SSID "WIFI NAME"            //Enter WiFi Name
#define WIFI_PASS "WIFI PASSWORD"        //Enter WiFi Password

void relayOnOff(int relay) {
    switch (relay) {
        case 1:
            if (toggleState_1 == 1) {
                digitalWrite(RelayPin1, LOW); // turn on relay 1
                toggleState_1 = 0;
                Serial.println("Device1 ON");
            } else {
                digitalWrite(RelayPin1, HIGH); // turn off relay 1
                toggleState_1 = 1;
                Serial.println("Device1 OFF");
            }
            delay(100);
            break;
        case 2:
            if (toggleState_2 == 1) {
                digitalWrite(RelayPin2, LOW); // turn on relay 2
                toggleState_2 = 0;
                Serial.println("Device2 ON");
            } else {
                digitalWrite(RelayPin2, HIGH); // turn off relay 2
                toggleState_2 = 1;
                Serial.println("Device2 OFF");
            }
            delay(100);
            break;
        case 3:
            if (toggleState_3 == 1) {
                digitalWrite(RelayPin3, LOW); // turn on relay 3
                toggleState_3 = 0;
                Serial.println("Device3 ON");
            } else {
                digitalWrite(RelayPin3, HIGH); // turn off relay 3
                toggleState_3 = 1;
                Serial.println("Device3 OFF");
            }
            delay(100);
            break;
        case 4:
            if (toggleState_4 == 1) {
                digitalWrite(RelayPin4, LOW); // turn on relay 4
                toggleState_4 = 0;
                Serial.println("Device4 ON");
            } else {
                digitalWrite(RelayPin4, HIGH); // turn off relay 4
                toggleState_4 = 1;
                Serial.println("Device4 OFF");
            }
            delay(100);
            break;
        default:
            break;
    }
}

void with_internet() {
    //Manual Switch Control
    if (digitalRead(SwitchPin1) == LOW) {
        delay(200);
        relayOnOff(1);
        Blynk.virtualWrite(VPIN_BUTTON_1, toggleState_1);   // Update Button Widget
    } else if (digitalRead(SwitchPin2) == LOW) {
        delay(200);
        relayOnOff(2);
        Blynk.virtualWrite(VPIN_BUTTON_2, toggleState_2);   // Update Button Widget
    } else if (digitalRead(SwitchPin3) == LOW) {
        delay(200);
        relayOnOff(3);
        Blynk.virtualWrite(VPIN_BUTTON_3, toggleState_3);   // Update Button Widget
    } else if (digitalRead(SwitchPin4) == LOW) {
        delay(200);
        relayOnOff(4);
        Blynk.virtualWrite(VPIN_BUTTON_4, toggleState_4);   // Update Button Widget
    }
}

void without_internet() {
    //Manual Switch Control
    if (digitalRead(SwitchPin1) == LOW) {
        delay(200);
        relayOnOff(1);
    } else if (digitalRead(SwitchPin2) == LOW) {
        delay(200);
        relayOnOff(2);
    } else if (digitalRead(SwitchPin3) == LOW) {
        delay(200);
        relayOnOff(3);
    } else if (digitalRead(SwitchPin4) == LOW) {
        delay(200);
        relayOnOff(4);
    }
}

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

// 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;
        digitalWrite(wifiLed, LOW); //Turn off WiFi LED
    } else {
        wifiFlag = 0;
        digitalWrite(wifiLed, HIGH); //Turn on WiFi LED
    }
}

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);

    WiFi.begin(WIFI_SSID, WIFI_PASS);
    timer.setInterval(3000L, checkBlynkStatus); // check if Blynk server is connected every 3 seconds
    Blynk.config(BLYNK_AUTH_TOKEN);
}

void loop() {
    if (WiFi.status() != WL_CONNECTED) {
        Serial.println("WiFi Not Connected");
    } else {
        Serial.println("WiFi Connected");
        Blynk.run();
    }

    timer.run(); // Initiates SimpleTimer
    if (wifiFlag == 0)
        with_internet();
    else
        without_internet();
}