// https://forum.arduino.cc/t/joining-4-arduino-sketches-in-to-one-sketch-and-adding-a-button/1416208/

#include <FastLED.h>
#define NUM_LEDS    10// Total number of LEDs in your strip
#define DATA_PIN    3   // The Arduino pin connected to the Data In line
#define LED_TYPE    WS2812B // Adjust to your specific LED type
#define COLOR_ORDER GRB  // Adjust to your specific color order (may be RGB or BGR)
#define BRIGHTNESS  255   // Adjust brightness (0-255)
CRGB leds[NUM_LEDS];

// sketch one
#define GROUP_SIZE  2    // Number of LEDs in each group
#define FLASH_DELAY 200  // Delay in milliseconds for each flash (controls speed)

// sketch two
#define CHASE_DELAY 100
#define CHASER_SIZE 4
#define CHASER_COLOR CRGB(255, 255, 255)

// button stuff
byte buttonPin = 12; // DIO pin for button N.O. pin
int cases = 3, buttonCounter; // count button presses
unsigned long buttonTimer, buttonTimeout = 50; // used in readButton() debounce timer
bool currentButtonState, lastButtonRead; // record button states

int i, j;
unsigned long sketch01Timer, sketch01Timeout = 200;

void setup() {
  Serial.begin(115200);
  pinMode(buttonPin, INPUT_PULLUP); // pin --> button (n.o.) button --> gnd
  Serial.print("Press yer button on Pin ");
  Serial.print(buttonPin);
  Serial.println(".");
  Serial.print("buttonCounter: ");
  Serial.print(buttonCounter);

  FastLED.addLeds<LED_TYPE, DATA_PIN, COLOR_ORDER>(leds, NUM_LEDS);
  // FastLED.setCorrection(TypicalLEDStrip); // what is this and is it needed?
  FastLED.setBrightness(BRIGHTNESS);
  FastLED.clear(); // Turn all LEDs off
  FastLED.show();  // Update the strip
}

void loop() {
  readButton();
  switch (buttonCounter) {
    case 0: sketch01(); break;
    case 1: sketch02(); break;
    case 2: sketch03(); break;
    case 3: timeTravelChaser();  break;
    default: break;
  }
  if (buttonCounter > cases)
    buttonCounter = 0;
}

void sketch01() {  // GROUP_SIZE chaser
  if (millis() -  sketch01Timer > sketch01Timeout) { // if time between "now" and "last time" is greater than timeout
    sketch01Timer = millis(); // reset timer
    if (i++ > NUM_LEDS - GROUP_SIZE) // constrain trailing LED count to NUM_LEDS - GROUP_SIZE
      i = 0; // start for trailing LED
    fill_solid(leds + i, GROUP_SIZE, CRGB::White ); // fill LEDs from leds + i to leds + GROUP_SIZE
    FastLED.show(); // display the buffer
    FastLED.clear(); // clear the buffer
  }
}

void sketch02() {
  Serial.print(2);
}

void sketch03() {
  Serial.print(3);
}

void timeTravelChaser() {
  Serial.print(4);
}

void flashRapidly(int count, int flashDelay) {
  for (int i = 0; i < count; i++) {
    fill_solid(leds, NUM_LEDS, CRGB::White); // All LEDs white
    FastLED.show();
    delay(flashDelay);
    FastLED.clear(); // All LEDs off
    FastLED.show();
    delay(flashDelay);
  }
}

void readButton() {
  // =======================================================
  // READ A BUTTON AND INCREMENT A COUNTER
  // =======================================================
  bool currentButtonRead = digitalRead(buttonPin);              // read button pin

  if (currentButtonRead != lastButtonRead) {                    // if THIS read is not the same as LAST read...
    buttonTimer = millis();                                     // ...start a timer by storing millis()
    lastButtonRead = currentButtonRead;                         // ... and store current state
  }

  if ((millis() - buttonTimer) > buttonTimeout) {               // if button change was longer than debounce timeout
    if (currentButtonState == HIGH && lastButtonRead == LOW) {  // ... and State is "NOT pressed" while Button "IS PRESSED"
      //==================================================
      digitalWrite(LED_BUILTIN, HIGH);                          // The button WAS pressed...
      Serial.print(++buttonCounter);                            // Do something here...
      digitalWrite(LED_BUILTIN, LOW);                           // ... or call functions here.
      //==================================================
    }
    currentButtonState = currentButtonRead;                     // update button state for first if() condition test
  }
}