// ESP32 + 3x Potansiyometre + RGB LED (ortak katot) + OLED
// 3 pot ile R/G/B renk mikseri, OLED'de HEX + değer gösterimi

#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

// ADC pinleri (input-only, ADC1 — WiFi ile uyumlu)
#define POT_R_PIN  34
#define POT_G_PIN  35
#define POT_B_PIN  32

// PWM pinleri (RGB LED — ortak katot)
#define LED_R_PIN  25
#define LED_G_PIN  26
#define LED_B_PIN  27

#define PWM_FREQ   5000
#define PWM_RES    8      // 8-bit (0-255)

#define SCREEN_W 128
#define SCREEN_H 64
#define OLED_ADDR 0x3C

Adafruit_SSD1306 oled(SCREEN_W, SCREEN_H, &Wire, -1);

uint8_t rVal = 0, gVal = 0, bVal = 0;
uint8_t prevR = 255, prevG = 255, prevB = 255;

void lcdAt(int x, int y, uint8_t size, const String &text) {
  oled.setTextSize(size);
  oled.setCursor(x, y);
  oled.print(text);
}

String toHex(uint8_t v) {
  String s = String(v, HEX);
  s.toUpperCase();
  if (s.length() < 2) s = "0" + s;
  return s;
}

void drawSplash() {
  oled.clearDisplay();
  oled.setTextColor(SSD1306_WHITE);
  lcdAt(6, 10, 2, "BlueGrays");
  lcdAt(4, 40, 1, "Renk Mikser v1.0");
  oled.drawRoundRect(2, 2, 124, 60, 6, SSD1306_WHITE);
  oled.display();
}

void drawMain() {
  oled.clearDisplay();
  oled.setTextColor(SSD1306_WHITE);

  // Başlık
  lcdAt(0, 0, 1, "> Renk Mikser");
  oled.drawLine(0, 10, 127, 10, SSD1306_WHITE);

  // 3 bar (R, G, B) — Y=14-22
  lcdAt(0, 14, 1, "R");
  oled.drawRect(10, 14, 100, 6, SSD1306_WHITE);
  int wR = (100 * rVal) / 255;
  oled.fillRect(10, 14, wR, 6, SSD1306_WHITE);
  lcdAt(114, 14, 1, String(rVal));

  lcdAt(0, 23, 1, "G");
  oled.drawRect(10, 23, 100, 6, SSD1306_WHITE);
  int wG = (100 * gVal) / 255;
  oled.fillRect(10, 23, wG, 6, SSD1306_WHITE);
  lcdAt(114, 23, 1, String(gVal));

  lcdAt(0, 32, 1, "B");
  oled.drawRect(10, 32, 100, 6, SSD1306_WHITE);
  int wB = (100 * bVal) / 255;
  oled.fillRect(10, 32, wB, 6, SSD1306_WHITE);
  lcdAt(114, 32, 1, String(bVal));

  // HEX kod büyük — Y=45
  String hex = "#" + toHex(rVal) + toHex(gVal) + toHex(bVal);
  oled.setTextSize(2);
  int hexW = hex.length() * 12;
  oled.setCursor((128 - hexW) / 2, 46);
  oled.print(hex);

  oled.display();
}

void setup() {
  Wire.begin();
  if (!oled.begin(SSD1306_SWITCHCAPVCC, OLED_ADDR)) {
    while (1);
  }

  drawSplash();
  delay(2500);

  // PWM kanalları
  ledcAttach(LED_R_PIN, PWM_FREQ, PWM_RES);
  ledcAttach(LED_G_PIN, PWM_FREQ, PWM_RES);
  ledcAttach(LED_B_PIN, PWM_FREQ, PWM_RES);

  // ADC 12-bit
  analogReadResolution(12);
}

void loop() {
  // 3 pot oku ve 0-4095 → 0-255 map
  rVal = map(analogRead(POT_R_PIN), 0, 4095, 0, 255);
  gVal = map(analogRead(POT_G_PIN), 0, 4095, 0, 255);
  bVal = map(analogRead(POT_B_PIN), 0, 4095, 0, 255);

  // RGB LED'e PWM uygula
  ledcWrite(LED_R_PIN, rVal);
  ledcWrite(LED_G_PIN, gVal);
  ledcWrite(LED_B_PIN, bVal);

  // Sadece değer değiştiyse OLED güncelle (flicker azalır)
  if (rVal != prevR || gVal != prevG || bVal != prevB) {
    drawMain();
    prevR = rVal; prevG = gVal; prevB = bVal;
  }

  delay(50);
}