// === Shauna Samms ====
// Module #6 project
// setup to use LCD

#include <LiquidCrystal_I2C.h> // lcd
LiquidCrystal_I2C lcd(0x27, 16, 2);

// North South LEDs pin configuration
const int red_LED1 = 14;     // Red LED1 wired to ESP32 GPIO14
const int yellow_LED1 = 12;  // Yellow LED1 wired to ESP32 GPIO12
const int green_LED1 = 13;   // Green LED1 wired to ESP32 GPIO13

// East West LEDs pin configuration
const int red_LED2 = 25;     // Red LED2 wired to ESP32 GPIO25
const int yellow_LED2 = 26;  // Yellow LED2 wired to ESP32 GPIO26
const int green_LED2 = 27;   // Green LED2 wired to ESP32 GPIO27

// setup crosswalk value and button variables
const int Xw_button = 19; // Cross Walk button
bool Xw_value = false;    // flag

// setup buzzer pin assignment
const int bzr = 32; // GPIO32 to connect the Buzzer

// Define what happens when interrupt is activated
void IRAM_ATTR crosswalkB()
{ // Cross Walk button interrupt handler
  Xw_value = true;
}

// the setup function runs once when you press reset or power the board
void setup()
{
  // setup crosswalk button as input and attach the Interrupt
  pinMode(Xw_button, INPUT_PULLUP); // 0=pressed, 1=unpressed button
  attachInterrupt(digitalPinToInterrupt(Xw_button), crosswalkB, RISING);

  // setup serial speed
  Serial.begin(115200);

  // LCD setup
  lcd.init();        // initialize the lcd
  lcd.backlight();   // turn on backlight
  lcd.setCursor(0, 0);
  lcd.print(" === CEIS114 ===");

  // buzzer set to output
  pinMode(bzr, OUTPUT);
  tone(bzr, 0);

  // NS pin direction set to output
  pinMode(red_LED1, OUTPUT);
  pinMode(yellow_LED1, OUTPUT);
  pinMode(green_LED1, OUTPUT);

  // EW pin direction set to output
  pinMode(red_LED2, OUTPUT);
  pinMode(yellow_LED2, OUTPUT);
  pinMode(green_LED2, OUTPUT);
}

// this loop function runs over and over again forever - keeps the main program always running
void loop()
{
  // while Crosswalk button pressed
  while (Xw_value == true)
  {
    delay(500);

    digitalWrite(yellow_LED1, LOW);
    digitalWrite(green_LED1, LOW);
    digitalWrite(yellow_LED2, LOW);
    digitalWrite(green_LED2, LOW);

    for (int i = 10; i > 0; i--)
    {
      Serial.print(" Count = ");
      Serial.print(i);
      Serial.println(" == Walk == ");

      lcd.setCursor(0, 1);
      lcd.print(" == Walk == ");
      lcd.print(i);
      lcd.print(" =   "); // spaces help clear leftovers

      digitalWrite(red_LED1, HIGH);
      digitalWrite(red_LED2, HIGH);

      tone(bzr, 200);
      delay(500);

      digitalWrite(red_LED1, LOW);
      digitalWrite(red_LED2, LOW);

      tone(bzr, 250);
      delay(500);
    }

    tone(bzr, 0);
    Xw_value = false;
  }

  // while Crosswalk button is not pressed
  while (Xw_value == false)
  {
    lcd.setCursor(0, 1);
    lcd.print("= Do Not Walk = ");

    Serial.println(" == Do Not Walk == ");

    digitalWrite(red_LED1, HIGH);
    digitalWrite(yellow_LED1, LOW);
    digitalWrite(green_LED1, LOW);
    delay(1000);

    digitalWrite(red_LED2, LOW);
    digitalWrite(yellow_LED2, LOW);
    digitalWrite(green_LED2, HIGH);
    delay(1000);

    digitalWrite(red_LED2, LOW);
    digitalWrite(yellow_LED2, HIGH);
    digitalWrite(green_LED2, LOW);
    delay(1000);

    digitalWrite(red_LED2, HIGH);
    digitalWrite(yellow_LED2, LOW);
    digitalWrite(green_LED2, LOW);
    delay(1000);

    digitalWrite(red_LED1, LOW);
    digitalWrite(yellow_LED1, LOW);
    digitalWrite(green_LED1, HIGH);
    delay(1000);

    digitalWrite(red_LED1, LOW);
    digitalWrite(yellow_LED1, HIGH);
    digitalWrite(green_LED1, LOW);

    digitalWrite(red_LED2, HIGH);
    digitalWrite(yellow_LED2, LOW);
    digitalWrite(green_LED2, LOW);
    delay(1000);
  }
}