/**
   Simon Game for Arduino with Score display

   Copyright (C) 2022, Uri Shaked

   Released under the MIT License.
*/
#include "pitches.h"

/* Constants - define pin numbers for LEDs,
   buttons and speaker, and also the game tones: */
const uint8_t ledPins[] = {9, 10, 11, 12, 6};
const uint8_t buttonPins[] = {2, 3, 4, 5};
#define SPEAKER_PIN 8

// These are connected to 74HC595 shift register (used to show game score):
const int LATCH_PIN = A1;  // 74HC595 pin 12
const int DATA_PIN = A0;  // 74HC595pin 14
const int CLOCK_PIN = A2;  // 74HC595 pin 11

///*******************************************
const int E_DATA_PIN = A4;  // 74HC595 pin 14
///*******************************************

#define MAX_GAME_LENGTH 100

const int gameTones[] = { NOTE_G3, NOTE_C4, NOTE_E4, NOTE_G5, NOTE_DS4};

/* Global variables - store the game state */
uint8_t gameSequence[MAX_GAME_LENGTH] = {0};
uint8_t gameIndex = 0;

/**
   Set up the Arduino board and initialize Serial communication
*/
void setup() {
  Serial.begin(9600);
  for (byte i = 0; i < 5; i++) {
    pinMode(ledPins[i], OUTPUT);
    pinMode(buttonPins[i], INPUT_PULLUP);
  }
  pinMode(SPEAKER_PIN, OUTPUT);
  pinMode(LATCH_PIN, OUTPUT);
  pinMode(CLOCK_PIN, OUTPUT);
  pinMode(DATA_PIN, OUTPUT);


  ///*******************************************
  pinMode(E_DATA_PIN, OUTPUT);
  ///*******************************************


  // The following line primes the random number generator.
  // It assumes pin A3 is floating (disconnected):
  randomSeed(analogRead(A3));
}

/* Digit table for the 7-segment display */
const uint8_t digitTable[] = {
  0b11000000,
  0b11111001,
  0b10100100,
  0b10110000,
  0b10011001,
  0b10010010,
  0b10000010,
  0b11111000,
  0b10000000,
  0b10010000,
};
const uint8_t DASH = 0b10111111;


///*******************************************
const uint8_t ERROR = 0b11000000;	

struct Monitor_State monitor_state = { INITIAL, false, 0 };
struct Monitor_Inputs monitor_inputs = { 0, 0 };

void sendError(uint8_t low) {
  digitalWrite(LATCH_PIN, LOW);
  shiftOut(E_DATA_PIN, CLOCK_PIN, MSBFIRST, low);
  digitalWrite(LATCH_PIN, HIGH);
}

void displayError() {
  if(monitor_state.error == true){
    sendError(ERROR);
  }
}
///*******************************************


void sendScore(uint8_t high, uint8_t low) {
  digitalWrite(LATCH_PIN, LOW);
  shiftOut(DATA_PIN, CLOCK_PIN, MSBFIRST, low);
  shiftOut(DATA_PIN, CLOCK_PIN, MSBFIRST, high);
  digitalWrite(LATCH_PIN, HIGH);
}

void displayScore() {
  //int high = gameIndex % 100 / 10;
  //int low = gameIndex % 10;

  ///*******************************************
  /**/
  int high = monitor_state.state_duration % 100 / 10;
  int low = monitor_state.state_duration % 10;
  //delay(100);
  //int low = monitor_state.state % 10;
  //int low = monitor_state.error % 10;
  //int low = monitor_inputs.BUTTON;
  ///*******************************************

  sendScore(high ? digitTable[high] : 0xff, digitTable[low]);
}

/**
   Lights the given LED and plays a suitable tone
*/
void lightLedAndPlayTone(byte ledIndex) {

  ///*******************************************
  if(ledIndex != 4){
    monitor_inputs.LED = 1; // LED is turned on
  }
  ///*******************************************

  digitalWrite(ledPins[ledIndex], HIGH);
  tone(SPEAKER_PIN, gameTones[ledIndex]);
  delay(300);
  digitalWrite(ledPins[ledIndex], LOW);
  noTone(SPEAKER_PIN);
}

/**
   Plays the current sequence of notes that the user has to repeat
*/
void playSequence() {
  //for (int i = 0; i < gameIndex; i++) {
    byte currentLed = gameSequence[gameIndex];

    ///*******************************************
    monitor_state = { INITIAL, false, 0 };
    monitor_inputs.LED = 0;
    ///*******************************************

    lightLedAndPlayTone(currentLed);
    delay(50);
 // }
}

/**
    Waits until the user pressed one of the buttons,
    and returns the index of that button
*/
byte readButtons() {
  while (true) {
    for (byte i = 0; i < 4; i++) {
      byte buttonPin = buttonPins[i];

      ///*******************************************
      bool button_read = (digitalRead(buttonPin) == LOW);

      monitor_inputs.BUTTON = button_read;

      Arduino(&monitor_state, &monitor_inputs);

      displayScore();
      delay(19);

      if(monitor_state.error == true){
        lightLedAndPlayTone(4);
        delay(500);
        monitor_state = { INITIAL, false, 0 };
        return -1;
      }
      ///*******************************************

      if (button_read) {
        return i;
      }
    }
    delay(1);
  }
}

/**
  Play the game over sequence, and report the game score
*/
void gameOver() {
  Serial.print("Game over! your score: ");
  Serial.println(gameIndex - 1);
  gameIndex = 0;
  delay(200);

  // Play a Wah-Wah-Wah-Wah sound
  tone(SPEAKER_PIN, NOTE_DS5);
  delay(300);
  tone(SPEAKER_PIN, NOTE_D5);
  delay(300);
  tone(SPEAKER_PIN, NOTE_CS5);
  delay(300);
  for (byte i = 0; i < 10; i++) {
    for (int pitch = -10; pitch <= 10; pitch++) {
      tone(SPEAKER_PIN, NOTE_C5 + pitch);
      delay(5);
    }
  }
  noTone(SPEAKER_PIN);

  sendScore(DASH, DASH);

  delay(500);
}

/**
   Get the user's input and compare it with the expected sequence.
*/
bool checkUserSequence() {
  //for (int i = 0; i < gameIndex; i++) {
    byte expectedButton = gameSequence[gameIndex];
    byte actualButton = readButtons();
    lightLedAndPlayTone(actualButton);
    if (expectedButton != actualButton) {
      return false;
    }
  //}

  return true;
}

/**
   Plays a hooray sound whenever the user finishes a level
*/
void playLevelUpSound() {
  tone(SPEAKER_PIN, NOTE_E4);
  delay(150);
  tone(SPEAKER_PIN, NOTE_G4);
  delay(150);
  tone(SPEAKER_PIN, NOTE_E5);
  delay(150);
  tone(SPEAKER_PIN, NOTE_C5);
  delay(150);
  tone(SPEAKER_PIN, NOTE_D5);
  delay(150);
  tone(SPEAKER_PIN, NOTE_G5);
  delay(150);
  noTone(SPEAKER_PIN);
}

///*******************************************
void Arduino(struct Monitor_State* monitor_state, struct Monitor_Inputs* monitor_inputs)
{
	enum States state = monitor_state->state;
	bool error = monitor_state->error;
	unsigned int state_duration = monitor_state->state_duration;

	// Monitor inputs
	bool LED = monitor_inputs->LED;
	bool BUTTON = monitor_inputs->BUTTON;

	switch (state) {

		case INITIAL:
			state_duration += 1;
			if (!LED) {
				state = INITIAL;

			}
			else if (LED && !BUTTON) {
				state = WAIT;
				state_duration = 0;
			}
			break;

		case WAIT:
			state_duration += 1;
			if (!BUTTON && state_duration <= MAX_TIME) {
				state = WAIT;

			}
			else if (LED && BUTTON && state_duration <= MAX_TIME) {
				state = RESPONSE;
				state_duration = 0;
			}
			else if (!BUTTON && state_duration > MAX_TIME) {
				state = MAX_TIME_ERROR;

			}
			break;

		case RESPONSE:
			state_duration += 1;
			if (!LED) {
				state = INITIAL;
				state_duration = 0;
			}
			break;

		case MAX_TIME_ERROR:
			error = true;
			break;

		default:
			error = true;
			break;
	}

	monitor_state->state = state;
	monitor_state->error = error;
	monitor_state->state_duration = state_duration;
}
///*******************************************

/**
   The main game loop
*/
void loop() {
  //displayScore();

  // Add a random color to the end of the sequence
  gameSequence[gameIndex] = random(0, 4);
  gameIndex++;
  if (gameIndex >= MAX_GAME_LENGTH) {
    gameIndex = MAX_GAME_LENGTH - 1;
  }

  playSequence();

  if (!checkUserSequence()) {
    gameOver();

  }

  delay(300);

  if (gameIndex > 0) {
    playLevelUpSound();
    delay(300);
  }
}