/*************************************************
 * DADU DIGITAL ESP32 FINAL
 * OLED + ENCODER + BUTTON + BUZZER + BLYNK
 *************************************************/

#define BLYNK_PRINT Serial

#define BLYNK_TEMPLATE_ID   "TMPL67S4-IZ9T"
#define BLYNK_TEMPLATE_NAME "Dadu Digital"
#define BLYNK_AUTH_TOKEN    "T2oigg-FnacIlrmFT06FM7qfBiBK_UWB"

// ================= LIBRARY =================
#include <WiFi.h>
#include <WiFiClient.h>
#include <BlynkSimpleEsp32.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

// ================= WIFI =================
char ssid[] = "Wokwi-GUEST";
char pass[] = "";

// ================= OLED =================
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

// ================= PIN =================
#define CLK        27
#define DT         14
#define SW         25
#define RESET_BTN  26
#define BUZZER     18

// ================= STATE =================
enum State {
  START_MENU,
  PILIH_MODE,
  MANUAL,
  OTOMATIS
};
State state = START_MENU;

// ================= VAR =================
int menuMode = 0;     // 0 Manual | 1 Otomatis
int menuDadu = 0;     // 0 = 1 dadu | 1 = 2 dadu
int lastCLK;

int dadu1 = 1;
int dadu2 = 1;

unsigned long lastAuto = 0;
const unsigned long autoDelay = 4000;

// ================= BLYNK =================
BLYNK_WRITE(V0) { // MODE
  if (state != START_MENU) {
    state = param.asInt() ? OTOMATIS : MANUAL;
    tampilMenuDadu();
  }
}

BLYNK_WRITE(V1) { // JUMLAH DADU
  menuDadu = param.asInt();
  tampilMenuDadu();
}

BLYNK_WRITE(V2) { // LEMPAR MANUAL
  if (state == MANUAL && param.asInt()) {
    lemparDadu();
  }
}

BLYNK_WRITE(V3) { // RESET
  if (param.asInt()) resetSistem();
}

BLYNK_WRITE(V4) { // START
  if (param.asInt() && state == START_MENU) {
    state = PILIH_MODE;
    tampilPilihMode();
  }
}

// ================= SETUP =================
void setup() {
  Serial.begin(115200);
  Wire.begin(21, 22);

  pinMode(CLK, INPUT);
  pinMode(DT, INPUT);
  pinMode(SW, INPUT_PULLUP);
  pinMode(RESET_BTN, INPUT_PULLUP);
  pinMode(BUZZER, OUTPUT);

  randomSeed(analogRead(34));
  lastCLK = digitalRead(CLK);

  Blynk.begin(BLYNK_AUTH_TOKEN, ssid, pass);

  if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    while (1);
  }

  tampilStart();
}

// ================= LOOP =================
void loop() {
  Blynk.run();
  bacaEncoder();

  if (digitalRead(SW) == LOW) {
    delay(200);
    tombolEnter();
  }

  if (digitalRead(RESET_BTN) == LOW) {
    delay(200);
    resetSistem();
  }

  if (state == OTOMATIS && millis() - lastAuto >= autoDelay) {
    lastAuto = millis();
    lemparDadu();
  }
}

// ================= START SCREEN =================
void tampilStart() {
  const char* text = "Start";
  int textSize = 3;

  int charWidth  = 6 * textSize;
  int charHeight = 8 * textSize;
  int textWidth  = strlen(text) * charWidth;

  int x = (SCREEN_WIDTH  - textWidth)  / 2;
  int y = (SCREEN_HEIGHT - charHeight) / 2;

  // Kedip 3x
  for (int i = 0; i < 3; i++) {
    display.clearDisplay();
    display.setTextSize(textSize);
    display.setTextColor(WHITE);
    display.setCursor(x, y);
    display.print(text);
    display.display();
    delay(200);

    display.clearDisplay();
    display.display();
    delay(200);
  }

  // Teks diam (tenang)
  display.clearDisplay();
  display.setTextSize(textSize);
  display.setTextColor(WHITE);
  display.setCursor(x, y);
  display.print(text);
  display.display();

  digitalWrite(BUZZER, HIGH);
  delay(80);
  digitalWrite(BUZZER, LOW);
}

// ================= ENCODER =================
void bacaEncoder() {
  if (state == START_MENU) return;

  int currentCLK = digitalRead(CLK);
  if (currentCLK != lastCLK && currentCLK == HIGH) {

    if (digitalRead(DT) != currentCLK) {
      if (state == PILIH_MODE) menuMode++;
      else menuDadu++;
    } else {
      if (state == PILIH_MODE) menuMode--;
      else menuDadu--;
    }

    menuMode = constrain(menuMode, 0, 1);
    menuDadu = constrain(menuDadu, 0, 1);

    if (state == PILIH_MODE) tampilPilihMode();
    else tampilMenuDadu();
  }
  lastCLK = currentCLK;
}

// ================= ENTER =================
void tombolEnter() {
  if (state == START_MENU) {
    state = PILIH_MODE;
    tampilPilihMode();
  }
  else if (state == PILIH_MODE) {
    state = (menuMode == 0) ? MANUAL : OTOMATIS;
    tampilMenuDadu();
  }
  else if (state == MANUAL) {
    lemparDadu();
  }
}

// ================= DISPLAY =================
void tampilPilihMode() {
  display.clearDisplay();
  display.setTextSize(1);

  display.setCursor(30, 0);
  display.print("PILIH MODE");

  display.setCursor(20, 25);
  display.print(menuMode == 0 ? "> MANUAL" : "  MANUAL");

  display.setCursor(20, 40);
  display.print(menuMode == 1 ? "> OTOMATIS" : "  OTOMATIS");

  display.display();
}

void tampilMenuDadu() {
  display.clearDisplay();

  display.setCursor(15, 0);
  display.print(state == MANUAL ? "MODE MANUAL" : "MODE OTOMATIS");

  display.setCursor(20, 25);
  display.print(menuDadu == 0 ? "> 1 DADU" : "  1 DADU");

  display.setCursor(20, 40);
  display.print(menuDadu == 1 ? "> 2 DADU" : "  2 DADU");

  display.display();
}

// ================= DADU =================
void lemparDadu() {
  digitalWrite(BUZZER, HIGH);

  for (int i = 0; i < 6; i++) {
    dadu1 = random(1, 7);
    dadu2 = random(1, 7);
    tampilDadu();
    delay(120);
  }

  digitalWrite(BUZZER, LOW);
  kirimKeBlynk();
}

void tampilDadu() {
  display.clearDisplay();

  display.drawRect(10, 10, 40, 40, WHITE);
  gambarTitik(dadu1, 10, 10);

  if (menuDadu == 1) {
    display.drawRect(78, 10, 40, 40, WHITE);
    gambarTitik(dadu2, 78, 10);
  }

  display.setCursor(25, 55);
  display.print("TOTAL: ");
  display.print(menuDadu == 0 ? dadu1 : dadu1 + dadu2);

  display.display();
}

// ================= BLYNK SEND =================
void kirimKeBlynk() {
  Blynk.virtualWrite(V5, dadu1);
  Blynk.virtualWrite(V6, menuDadu ? dadu2 : 0);
  Blynk.virtualWrite(V7, menuDadu ? dadu1 + dadu2 : dadu1);
}

// ================= RESET =================
void resetSistem() {
  state = START_MENU;
  menuMode = 0;
  menuDadu = 0;
  tampilStart();
}

// ================= TITIK DADU =================
void gambarTitik(int n, int x, int y) {
  int cx = x + 20, cy = y + 20, s = 10;

  if (n == 1) dot(cx, cy);
  if (n == 2) { dot(cx - s, cy - s); dot(cx + s, cy + s); }
  if (n == 3) { dot(cx, cy); dot(cx - s, cy - s); dot(cx + s, cy + s); }
  if (n == 4) {
    dot(cx - s, cy - s); dot(cx + s, cy - s);
    dot(cx - s, cy + s); dot(cx + s, cy + s);
  }
  if (n == 5) {
    dot(cx, cy);
    dot(cx - s, cy - s); dot(cx + s, cy - s);
    dot(cx - s, cy + s); dot(cx + s, cy + s);
  }
  if (n == 6) {
    dot(cx - s, cy - s); dot(cx - s, cy); dot(cx - s, cy + s);
    dot(cx + s, cy - s); dot(cx + s, cy); dot(cx + s, cy + s);
  }
}

void dot(int x, int y) {
  display.fillCircle(x, y, 2, WHITE);
}