#include <Arduino.h>
#include <TFT_eSPI.h>

#define LEFT_BUTTON 0
#define RIGHT_BUTTON 14

#define RANDOM_LOWER_BOUND 0
#define RANDOM_UPPER_BOUND 100000

int randomNumber = 0;

void rainbowStrobe();


TFT_eSPI tft = TFT_eSPI();  // Invoke library, 

void setup() {

  randomSeed(analogRead(1)); // Set a random seed
  randomNumber = random(RANDOM_LOWER_BOUND, RANDOM_UPPER_BOUND); //Generate a new random number

  Serial.begin(115200); // Setup serial monitor

  pinMode(LEFT_BUTTON, INPUT_PULLUP);
  pinMode(RIGHT_BUTTON, INPUT_PULLUP);

  Serial.println("Commencing screen colour pulse."); // Print message to serial monitor

  tft.init(); // Start the ESP32 screen
  tft.setRotation(3); //Set the ESP32 screen orientation
  tft.fillScreen(TFT_BLACK); //Set the screen to all black

  delay(1000); // Wait 1 second
  tft.fillScreen(TFT_RED); //Fill the screen red
  
  delay(1000); // Wait 1 second
  tft.fillScreen(TFT_GREEN); // Fill the screen green  
  
  delay(1000); // Wait 1 second
  tft.fillScreen(TFT_BLUE); // Fill the screen blue
  
  delay(1000); // Wait 1 second
  tft.fillScreen(TFT_BLACK); // Set screen back to black

  Serial.println("Finished screen colour pulse."); // Print message to serial monitor
}

void loop() {
  bool left_button_pressed = !digitalRead(LEFT_BUTTON);
  bool right_button_pressed = !digitalRead(RIGHT_BUTTON);

  tft.fillRect(200, 0, 120, 50, TFT_BLACK); // Fill the dynamic part of the screen with black to clear it

  tft.setTextColor(TFT_WHITE); // Set text font colour
  tft.setTextSize(2); // Set text font size

  tft.setCursor(0, 0); // Set cursor to top left
  tft.print("Left button state:  "); // Write text to LCD Screen
  tft.println(left_button_pressed); // Write text to LCD Screen
  tft.print("Right button state: "); // Write text to LCD Screen
  tft.println(right_button_pressed); // Write text to LCD Screen

  tft.print("Random number is: "); // Write text to LCD Screen
  tft.println(randomNumber); // Write text to LCD screen

  // If both buttons pressed simultaneously, do a rainbow strobe 
  if (left_button_pressed && right_button_pressed) {
    rainbowStrobe();
  }

  delay(100); // Sleep for 100 millisecods to keep FPS modest 
}

void rainbowStrobe() {
  tft.fillScreen(TFT_WHITE);
  delay(300);

  tft.fillScreen(TFT_RED);
  delay(300);

  tft.fillScreen(TFT_ORANGE);
  delay(300);

  tft.fillScreen(TFT_YELLOW);
  delay(300);

  tft.fillScreen(TFT_GREEN);
  delay(300);

  tft.fillScreen(TFT_BLUE);
  delay(300);

  tft.fillScreen(TFT_PURPLE);
  delay(300);

  tft.fillScreen(TFT_VIOLET);
  delay(300);

  tft.fillScreen(TFT_BLACK);
}