/*****************************************************************
Author: Tiger888
Date: 24/08/24
Last Update: Initial Version
The Project: Car Light Reminder System
Components: 
  Arduino Nano
  External Car Battery
  4 x AMS117 5V regulators
  3 x Single Pole (NO) swithes. They required only for Wokwi Simulation.
  5 x LEDs for system status indication
  1 x Busser for alert sound 
  5 x Resistors 220 Ohms: Current Limiter for LEDs
Input Sensors or states: Engine, tail Light and Door swith
Alert Conditions: Engine OFF and Tail Light ON and Door ON (Open)
Alert Medium: Red LED On and Buzzer sound 
*****************************************************************/

#include <Button.h>

const int buttonCount = 3;  // Number of buttons
Button buttons[buttonCount] = {Button(2), Button(3), Button(4)};  // Initialize buttons
const int ledPins[buttonCount] = {7, 8, 9};  // Corresponding LEDs for each button
bool ledStates[buttonCount] = {false, false, false};  // Store LED states

unsigned long lastDebounceTime[buttonCount] = {0, 0, 0};  // Debounce timers for each button
unsigned long debounceDelay = 50;  // Debounce delay time

const int redLedPin = 6;  // Pin for the red LED
const int buzzerPin = 5;  // Pin for buzzer

void setup() {
  
  for (int i = 0; i < buttonCount; i++) {
    pinMode(ledPins[i], OUTPUT);
    digitalWrite(ledPins[i], LOW);  // Ensure LEDs are off initially
  }

  pinMode(redLedPin, OUTPUT);
  digitalWrite(redLedPin, LOW);  // Ensure red LED is off initially
  pinMode(buzzerPin, OUTPUT);
  digitalWrite(buzzerPin, LOW);  // Ensure buzzer is off initially

  Serial.begin(9600);
}

void loop() {
  for (int i = 0; i < buttonCount; i++) {
    toggleButton(buttons[i], ledPins[i], ledStates[i], lastDebounceTime[i]);
  }

  // 1st Logic for the red LED & Buzzer
  if (!ledStates[0] && ledStates[1] && ledStates[2]) {  // Engine OFF, Tail Light ON, Door Open
    digitalWrite(redLedPin, HIGH);
    activateBuzzer();
    Serial.println("Red LED ON: Engine OFF, Tail Light ON, Door Open");
  } else {
    digitalWrite(redLedPin, LOW);
    digitalWrite(buzzerPin, LOW);
    Serial.println("Red LED OFF, Buzzer OFF");
  }

  /* 2nd Logic for the red LED & Buzzer : this is optional when driver
  ignores the first warning alert
  */
  // if (!ledStates[0] && ledStates[1]) {  // Engine OFF, Tail Light ON, Ignore Door Open
  //   digitalWrite(redLedPin, HIGH);
  //   activateBuzzer();
  //   Serial.println("Red LED ON: Engine OFF, Tail Light ON, Ignore Door Open or Close");
  // } else {
  //   digitalWrite(redLedPin, LOW);
  //   digitalWrite(buzzerPin, LOW);
  //   Serial.println("Red LED OFF, Buzzer OFF");
  // }

}

void toggleButton(Button& button, int buttonLedPin, bool& ledState, unsigned long& lastDebounceTime) {
  if (button.toggled()) {
    unsigned long currentTime = millis();
    if ((currentTime - lastDebounceTime) > debounceDelay) {
      if (button.read() == Button::PRESSED) {
        ledState = !ledState;  // Toggle the LED state
        digitalWrite(buttonLedPin, ledState ? HIGH : LOW);  // Update LED based on new state
        Serial.print("Button on pin ");
        Serial.print(buttonLedPin);
        Serial.println(ledState ? " - LED ON" : " - LED OFF");
        
        lastDebounceTime = currentTime;  // Update debounce time
      }
    }
  }
}

void activateBuzzer(){
  digitalWrite(buzzerPin, HIGH);
  delay(500);
  digitalWrite(buzzerPin, LOW);
  delay(500);
}