#include <ButtonDebounce.h>

#define LED_PIN       3
// #define ON_BTN_PIN    12
// #define OFF_BTN_PIN   11


#define OFF_LED     0
#define DIM_LED     20
#define MEDIUM_LED  85
#define FULL_LED    255
typedef enum{
  Event_ON,
  Event_OFF
}Event_t;

typedef enum{
  Light_State_OFF,
  Light_State_DIM,
  Light_State_MEDIUM,
  Light_State_FULL,

}Light_State_t;

// ButtonDebounce onButton(ON_BTN_PIN, 250);
// ButtonDebounce offButton(OFF_BTN_PIN, 250);

void light_fsm(Event_t event);

void setup() {
  // put your setup code here, to run once:
  pinMode(LED_PIN, OUTPUT);
  pinMode(LED_BUILTIN, OUTPUT);
  // pinMode(ON_BTN_PIN, INPUT);
  // pinMode(OFF_BTN_PIN, INPUT);

  Serial.begin(115200);

}

void loop() {
  // put your main code here, to run repeatedly:
  // onButton.update();
  // offButton.update();

  // if(onButton.state() == LOW and offButton.state() == HIGH){
  //   light_fsm(Event_ON);
  // }else if(onButton.state() == HIGH and offButton.state() == LOW){
  //   light_fsm(Event_OFF);
  // }

    if(Serial.available()){
    String inputCommand = Serial.readString();
    inputCommand.trim();
    inputCommand.toLowerCase();
    Serial.println(inputCommand);

    if(inputCommand=="on"){
      light_fsm(Event_ON);
      digitalWrite(LED_BUILTIN, HIGH);
    }

    if(inputCommand=="off"){
      light_fsm(Event_OFF);
      digitalWrite(LED_BUILTIN, LOW);
    }
  }

}

void light_fsm(Event_t event){
  static Light_State_t light_state = Light_State_OFF;

  switch(light_state){
    case Light_State_OFF:
                          switch(Event_ON){
                          case Event_ON:
                          analogWrite(LED_PIN, DIM_LED);
                          light_state = Light_State_DIM;
                          break;
                          // case Event_OFF:break;
                        }
                        break;
    case Light_State_DIM:
                          switch(Event_ON){
                          case Event_ON:
                          analogWrite(LED_PIN, MEDIUM_LED);
                          light_state = Light_State_MEDIUM;
                          break;
                          case Event_OFF:
                          analogWrite(LED_PIN, OFF_LED);
                          light_state = Light_State_OFF;
                          break;
                        }
                        break;
    case Light_State_MEDIUM:
                          switch(Event_ON){
                          case Event_ON:
                          analogWrite(LED_PIN, FULL_LED);
                          light_state = Light_State_FULL;
                          break;
                          case Event_OFF:
                          analogWrite(LED_PIN, OFF_LED);
                          light_state = Light_State_OFF;
                          break;
                        }
                        break;
    case Light_State_FULL:
                          switch(Event_ON){
                          case Event_ON:
                          analogWrite(LED_PIN, DIM_LED);
                          light_state = Light_State_DIM;
                          break;
                          case Event_OFF:
                          analogWrite(LED_PIN, OFF_LED);
                          light_state = Light_State_OFF;
                          break;
                        }
                        break;
  }
}