#define led_red 10
#define led_green 9
#define led_yellow 8

#define button_1_input 7
#define button_2_input 6

bool button_on = false;
bool button_read = false;
bool switch1 = false;

int red_brightness = 0; 
int yellow_brightness = 0; 
int green_brightness = 0; 

unsigned long button_millis = 0;
unsigned long red_millis = 0;
unsigned long green_millis = 0;
unsigned long yellow_millis = 0;
unsigned long serial_millis = 0;

enum current_state {
  red_fade_up,
  red_fade_down,
  green_fade_up,
  green_fade_down,
  yellow_fade_up,
  yellow_fade_down,
  leds_off,
};
current_state led_state = leds_off;

void setup() {
  pinMode(led_red, OUTPUT);
  pinMode(led_green, OUTPUT);
  pinMode(led_yellow, OUTPUT);
  pinMode(button_1_input, INPUT_PULLUP);
  pinMode(button_2_input, INPUT_PULLUP);
  Serial.begin(9600);
}

void loop() {

  handle_toggle_switch();

  handle_led();

  execute_led();

  if (millis() - serial_millis > 100){
  Serial.print(" led_state == ");
  Serial.println(led_state);
  Serial.print(" Taster == ");
  Serial.print(switch1);
  Serial.print(" LED_RED == ");
  Serial.print(red_brightness);
  Serial.print(" LED_GREEN == ");
  Serial.print(green_brightness);
  Serial.print(" LED_YELLOW == ");
  Serial.print(yellow_brightness);

  serial_millis = millis();
  }
}

void handle_toggle_switch() {

  bool button_read = digitalRead(button_1_input);
  
  unsigned long button_timer = millis() - button_millis;

  if (button_read == true){
    button_millis = millis();
  }

  if (button_read == false && button_on == false && button_timer > 20){
    button_on = true;
  }

  if (button_read == true && button_on == true){
    button_on = false;
    switch1 = !switch1;
  }
}

void handle_led() {

  unsigned long red_timer = millis() - red_millis;
  unsigned long green_timer = millis() - green_millis;
  unsigned long yellow_timer = millis() - yellow_millis;

  if (!switch1){
    led_state = leds_off;
  }

    if (switch1 && led_state == leds_off) {
    led_state = red_fade_up;  // Schalter aktiviert den ersten Zustand nur einmal
  }

  switch(led_state) {

    case leds_off:
    red_brightness = 0;
    green_brightness = 0;
    yellow_brightness = 0;
    break;

    case red_fade_up:

    if (red_timer > 10){
      red_brightness ++;
      red_millis = millis();
      if (red_brightness >= 255){
        led_state = green_fade_up;
        red_brightness = 255;
      }
    }
    break;

   case green_fade_up:

   if (green_timer > 10){
    green_brightness ++;
    green_millis = millis();
    if (green_brightness >= 255){
      led_state = yellow_fade_up;
      green_brightness = 255;
    }
  }
   break; 

   case yellow_fade_up:
  
     if (yellow_timer > 10){
    yellow_brightness ++;
    yellow_millis = millis();
    if (yellow_brightness >= 255){
      led_state = yellow_fade_down;
      yellow_brightness = 255;
    }
   }
   break; 

   case yellow_fade_down:

   if (yellow_timer > 10) {
    yellow_brightness --;
    yellow_millis = millis();
    if (yellow_brightness <= 0) {
      led_state = green_fade_down;
      yellow_brightness = 0;
    }
   }
   break;


   case green_fade_down:

   if (green_timer > 10) {
    green_brightness --;
    green_millis = millis();
    if (green_brightness <= 0) {
      led_state = red_fade_down;
      green_brightness = 0;
    }
   }
   break;

   case red_fade_down:

   if (red_timer > 10) {
    red_brightness --;
    red_millis = millis();
    if (red_brightness <= 0) {
      switch1 = false;
      red_brightness = 0;
    }
   }
   break;
 }
}

void execute_led() {

  analogWrite(led_red, red_brightness);
  analogWrite(led_green, green_brightness);
  analogWrite(led_yellow, yellow_brightness);
}