#include <LiquidCrystal_I2C.h>
#include <SdFat.h>

#define MAX_FILENAME_LENGTH 16

// Pins des encodeurs rotatifs
#define CLK1 2
#define DT1 3
#define SW1 4
#define CLK2 5
#define DT2 6
#define SW2 7
#define CLK3 8
#define DT3 9
#define SW3 10

// Déclarations LCD et SD
LiquidCrystal_I2C lcd(0x27, 16, 2);
SdFat SD;
const uint8_t SD_CS_PIN = 53;

// État du menu
enum MenuState { SPLASH, NORMAL, EDIT };
MenuState currentMenu = SPLASH;

// Variables pour la capture alphanumérique
char filename[MAX_FILENAME_LENGTH + 1] = "";  // Nom du fichier
int cursorPos = 0;  // Position du curseur dans le nom de fichier
int charIndex = 0;  // Index du caractère sélectionné
const char charSet[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
const int charSetSize = sizeof(charSet) - 1;

// Variables pour les encodeurs
int lastStateCLK1, lastStateCLK2, lastStateCLK3;

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

  pinMode(CLK1, INPUT);
  pinMode(DT1, INPUT);
  pinMode(SW1, INPUT_PULLUP);
  pinMode(CLK2, INPUT);
  pinMode(DT2, INPUT);
  pinMode(SW2, INPUT_PULLUP);
  pinMode(CLK3, INPUT);
  pinMode(DT3, INPUT);
  pinMode(SW3, INPUT_PULLUP);

  lastStateCLK1 = digitalRead(CLK1);
  lastStateCLK2 = digitalRead(CLK2);
  lastStateCLK3 = digitalRead(CLK3);

  // Splash Screen
  splashScreen();
  currentMenu = NORMAL;
  displayNormalMenu();
}

// Boucle principale
void loop() {
  switch (currentMenu) {
    case NORMAL:
      checkNormalMenuInput();
      break;
    case EDIT:
      checkEditMenuInput();
      break;
    default:
      break;
  }
}

// Écran de démarrage
void splashScreen() {
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Welcome to Synth!");
  lcd.setCursor(0, 1);
  lcd.print("Loading...");
  delay(2000);
  lcd.clear();
}

// Menu Normal
void displayNormalMenu() {
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Mode: Normal");
  lcd.setCursor(0, 1);
  lcd.print("Press SW1+SW2");
}

// Menu Edition
void displayEditMenu() {
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Edit Filename:");
  lcd.setCursor(0, 1);
  lcd.print(filename);
}

// Retour au menu normal
void returnToNormalMenu() {
  currentMenu = NORMAL;
  displayNormalMenu();
}

// Capture alphanumérique
void updateFilenameDisplay() {
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Editing:");
  lcd.setCursor(0, 1);
  lcd.print(filename);
  lcd.setCursor(cursorPos, 1);
  lcd.print("^");
}

// Vérification des entrées en mode normal
void checkNormalMenuInput() {
  if (digitalRead(SW1) == LOW && digitalRead(SW2) == LOW) {
    delay(200);  // Anti-rebond
    currentMenu = EDIT;
    displayEditMenu();
  }
}

// Vérification des entrées en mode édition
void checkEditMenuInput() {
  int currentStateCLK1 = digitalRead(CLK1);
  if (currentStateCLK1 != lastStateCLK1 && currentStateCLK1 == 1) {
    if (digitalRead(DT1) != currentStateCLK1) {
      charIndex = (charIndex + 1) % charSetSize;
    } else {
      charIndex = (charIndex - 1 + charSetSize) % charSetSize;
    }
    filename[cursorPos] = charSet[charIndex];
    updateFilenameDisplay();
  }
  lastStateCLK1 = currentStateCLK1;

  if (digitalRead(SW1) == LOW) {  // Validation du caractère
    cursorPos = (cursorPos + 1) % MAX_FILENAME_LENGTH;
    filename[cursorPos] = '\0';  // Met à jour la chaîne
    updateFilenameDisplay();
    delay(200);  // Anti-rebond
  }

  int currentStateCLK2 = digitalRead(CLK2);
  if (currentStateCLK2 != lastStateCLK2 && currentStateCLK2 == 1) {
    if (digitalRead(DT2) != currentStateCLK2) {
      cursorPos = (cursorPos + 1) % MAX_FILENAME_LENGTH;
    } else {
      cursorPos = (cursorPos - 1 + MAX_FILENAME_LENGTH) % MAX_FILENAME_LENGTH;
    }
    updateFilenameDisplay();
  }
  lastStateCLK2 = currentStateCLK2;

  if (digitalRead(SW2) == LOW) {  // Suppression du caractère sous le curseur
    filename[cursorPos] = ' ';
    updateFilenameDisplay();
    delay(200);  // Anti-rebond
  }

  if (digitalRead(SW3) == LOW) {  // Retour au menu normal
    delay(200);  // Anti-rebond
    returnToNormalMenu();
  }
}