#include <LiquidCrystal_I2C.h>
#include <RTClib.h>
#include <Adafruit_NeoPixel.h>

#define NEOPIXEL_PIN     6
#define NUMPIXELS        16
#define BUTTON_PIN       2
#define BTN_SET          4
#define BTN_CONTROL      2
#define BTN_END          10
#define POT_PIN          A1

Adafruit_NeoPixel strip(NUMPIXELS, NEOPIXEL_PIN, NEO_GRB + NEO_KHZ800);

uint8_t colors[][3] = {
  {255, 164, 61},    // כתום
  {241, 252, 119},   // צהוב
  {255, 255, 255},   // לבן
  {139, 215, 252}    // כחול
};

int fadeDelays[] = {300, 200, 100, 150};

LiquidCrystal_I2C lcd(0x27, 16, 2);
RTC_DS1307 rtc;

int h = 0, m = 0, s = 0;
int alarmH = 7, alarmM = 0;
int wakeBefore = 1;
int setState = 0;

bool preWarmStarted = false;
bool lightSequenceStarted = false;
bool alarmWasSet = false;
unsigned long lastSettingTime = 0;

bool alarmTriggered = false;
bool song1Started = false;
bool song2Started = false;
bool song3Started = false;
bool song4Started = false;
bool song5Started = false;
bool sequenceEnded = false;
int currentSong = 0;
unsigned long songStartTime = 0;
bool buttonPressed = false;
bool calmMode = false;
bool stayOnSong3 = false;

void setup() {
  lcd.init();
  lcd.backlight();
  Serial.begin(9600);

  pinMode(BTN_SET, INPUT_PULLUP);
  pinMode(BUTTON_PIN, INPUT_PULLUP);
  pinMode(BTN_CONTROL, INPUT_PULLUP);
  pinMode(BTN_END, INPUT_PULLUP);

  strip.begin();
  strip.show();

  rtc.begin();
  if (!rtc.isrunning()) {
    rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
  }
}

void loop() {
  DateTime now = rtc.now();
  h = now.hour(); m = now.minute(); s = now.second();

  int nowMin = h * 60 + m;
  int alarmMin = alarmH * 60 + alarmM;
  int blinkStartMin = alarmMin - wakeBefore;
  int preWarmMin = alarmMin - 2;

  // בדיקת כפתור סיום תמיד
  if (digitalRead(BTN_END) == LOW && !song5Started) {
    playSong(5);
    gradualFillWithFadeAndGradient(colors[3][0], colors[3][1], colors[3][2], fadeDelays[3]);
    sequenceEnded = true;
    return;
  }

  if (!preWarmStarted && nowMin == preWarmMin && alarmWasSet && (setState == 0 || setState == 4)) {
    preWarmStarted = true;
    gradualWarmup();
  }

  if (!alarmTriggered && nowMin == blinkStartMin && alarmWasSet && (setState == 0 || setState == 4)) {
    alarmTriggered = true;
    songStartTime = millis();
    if (digitalRead(BTN_CONTROL) == LOW) calmMode = true;
    lightSequenceStarted = true;
    startLightSequence();
  }

  if (sequenceEnded) return;

  if (digitalRead(BTN_CONTROL) == HIGH) buttonPressed = false;

  if (digitalRead(BTN_SET) == LOW) {
    delay(200);
    setState = (setState + 1) % 5;
  }

  int potValue = analogRead(POT_PIN);
  if (setState == 1) { alarmH = map(potValue, 0, 1023, 0, 23); alarmWasSet = true; lastSettingTime = millis(); }
  else if (setState == 2) { alarmM = map(potValue, 0, 1023, 0, 59); alarmWasSet = true; lastSettingTime = millis(); }
  else if (setState == 3) { wakeBefore = map(potValue, 0, 1023, 0, 59); alarmWasSet = true; lastSettingTime = millis(); }

  lcd.setCursor(0, 0);
  if (setState == 0) lcd.print("Set alarm          ");
  else if (setState == 1) { lcd.print("Set hour: "); printTwoDigits(alarmH); lcd.print("      "); }
  else if (setState == 2) { lcd.print("Set min:  "); printTwoDigits(alarmM); lcd.print("      "); }
  else if (setState == 3) { lcd.print("Set awake: "); lcd.print(wakeBefore); lcd.print("m     "); }
  else if (setState == 4) {
    lcd.print("Alarm ");
    printTwoDigits(alarmH); lcd.print(":");
    printTwoDigits(alarmM); lcd.print(", ");
    lcd.print(wakeBefore); lcd.print("m ");
  }

  updateClockDisplay();
  delay(100);
}

void printTwoDigits(int number) {
  if (number < 10) lcd.print("0");
  lcd.print(number);
}

void updateClockDisplay() {
  DateTime now = rtc.now();
  h = now.hour(); m = now.minute(); s = now.second();
  lcd.setCursor(0, 1);
  lcd.print("Time ");
  printTwoDigits(h); lcd.print(":");
  printTwoDigits(m); lcd.print(":");
  printTwoDigits(s);
  lcd.print("       ");
}

void gradualWarmup() {
  gradualFillWithFadeAndGradient(colors[0][0], colors[0][1], colors[0][2], fadeDelays[0]);
}

void gradualFillWithFadeAndGradient(uint8_t r, uint8_t g, uint8_t b, int delayMs) {
  for (int i = 0; i < NUMPIXELS; i++) {
    float baseBrightness = 0.5 + 0.5 * (float(i) / (NUMPIXELS - 1));
    for (int step = 0; step <= 100; step += 10) {
      float fadeFactor = step / 100.0;
      float total = baseBrightness * fadeFactor;
      strip.setPixelColor(i, strip.Color(r * total, g * total, b * total));
      strip.show();
      delay(5);
    }
    delay(delayMs);
  }

  // לאחר ההדרגתיות – מילוי אחיד
  for (int i = 0; i < NUMPIXELS; i++) {
    strip.setPixelColor(i, strip.Color(r, g, b));
  }
  strip.show();
}

void fillAllPixels(uint8_t r, uint8_t g, uint8_t b) {
  for (int i = 0; i < NUMPIXELS; i++) {
    strip.setPixelColor(i, strip.Color(r, g, b));
  }
  strip.show();
}

void playSong(int songNum) {
  currentSong = songNum;
  songStartTime = millis();
  switch (songNum) {
    case 1: song1Started = true; Serial.println("🎵 Play rustling leaves sound"); break;
    case 2: song2Started = true; Serial.println("🎵 Play bird chirping sound"); break;
    case 3: song3Started = true; Serial.println("🎵 Play harp sound melody"); break;
    case 4: song4Started = true; Serial.println("🎵 Play beeping truck reverse sound"); break;
    case 5: song5Started = true; Serial.println("🎵 Playing 'Happy' – motion detected"); break;
  }
}

void startLightSequence() {
  // שלב 1: כתום מהבהב + סאונד 1
  playSong(1);
  unsigned long blinkStart = millis();
  while (millis() - blinkStart < 10000) {
    if (digitalRead(BTN_END) == LOW && !song5Started) {
      playSong(5);
      gradualFillWithFadeAndGradient(colors[3][0], colors[3][1], colors[3][2], fadeDelays[3]);
      sequenceEnded = true;
      return;
    }

    if (millis() % 500 < 250) {
      fillAllPixels(colors[0][0], colors[0][1], colors[0][2]);
    } else {
      strip.clear();
      strip.show();
    }

    if (digitalRead(BTN_CONTROL) == LOW && !buttonPressed) {
      buttonPressed = true;
      stayOnSong3 = true;
      playSong(3);
      gradualFillWithFadeAndGradient(colors[2][0], colors[2][1], colors[2][2], fadeDelays[2]);
      return;
    }

    updateClockDisplay();
  }

  // שלב 2: צהוב + סאונד 2
  playSong(2);
  gradualFillWithFadeAndGradient(colors[1][0], colors[1][1], colors[1][2], fadeDelays[1]);
  unsigned long yellowStart = millis();
  while (millis() - yellowStart < 10000) {
    if (digitalRead(BTN_END) == LOW && !song5Started) {
      playSong(5);
      gradualFillWithFadeAndGradient(colors[3][0], colors[3][1], colors[3][2], fadeDelays[3]);
      sequenceEnded = true;
      return;
    }

    if (digitalRead(BTN_CONTROL) == LOW && !buttonPressed) {
      buttonPressed = true;
      stayOnSong3 = true;
      playSong(3);
      gradualFillWithFadeAndGradient(colors[2][0], colors[2][1], colors[2][2], fadeDelays[2]);
      return;
    }

    updateClockDisplay();
  }

  // שלב 3: לבן + סאונד 4 אם לא נלחץ קודם
  playSong(4);
  gradualFillWithFadeAndGradient(colors[2][0], colors[2][1], colors[2][2], fadeDelays[2]);

  unsigned long whiteStart = millis();
  while (millis() - whiteStart < 10000) {
    if (digitalRead(BTN_END) == LOW && !song5Started) {
      playSong(5);
      gradualFillWithFadeAndGradient(colors[3][0], colors[3][1], colors[3][2], fadeDelays[3]);
      sequenceEnded = true;
      return;
    }

    if (digitalRead(BTN_CONTROL) == LOW && !buttonPressed) {
      buttonPressed = true;
      stayOnSong3 = true;
      return;
    }

    updateClockDisplay();
  }
}