#include 
#include 
#include "DHT.h"

// -------------------- Pins & Devices --------------------
#define LED_PIN     6
#define NUM_LEDS    8

#define DHTPIN      7           // DATA pin of 4-pin DHT11 connected to D7
#define DHTTYPE     DHT11

// I2C LCD: 16x2, common address 0x27 (if not displayed, try 0x3F)
LiquidCrystal_I2C lcd(0x27, 16, 2);

Adafruit_NeoPixel strip(NUM_LEDS, LED_PIN, NEO_GRB + NEO_KHZ800);
DHT dht(DHTPIN, DHTTYPE);

// -------------------- Breathing parameters --------------------
// One full breathing cycle (dim -> bright -> dim), unit: ms
const unsigned long BREATH_PERIOD = 3000;

// Sensor reading interval
const unsigned long SENSOR_INTERVAL = 2000;
unsigned long lastSensorRead = 0;

// LCD refresh interval
const unsigned long LCD_INTERVAL = 500;
unsigned long lastLcd = 0;

// Current sensor values
float curTemp = NAN;
float curHumi = NAN;

// Colors: Blue (≤25) / Yellow (between 25~30) / Red (≥30)
uint32_t colorBlue;
uint32_t colorYellow;
uint32_t colorRed;

// Current target color
uint32_t targetColor;

void setup() {
  // Optional: enable pull-up on DHT data pin, more stable for raw sensors
  pinMode(DHTPIN, INPUT_PULLUP);

  // LED strip initialization
  strip.begin();
  strip.show();           // Clear
  strip.setBrightness(0); // Start breathing from dark

  // Preset colors
  colorBlue   = strip.Color(0, 0, 255);
  colorYellow = strip.Color(255, 180, 0);
  colorRed    = strip.Color(255, 0, 0);

  // Sensor/LCD
  dht.begin();
  lcd.init();
  lcd.backlight();

  // LCD initial message
  lcd.clear();
  lcd.setCursor(0, 0); lcd.print("WS2812 Breathing");
  lcd.setCursor(0, 1); lcd.print("DHT11 + LCD Ready");
  delay(800);
  lcd.clear();
}

void loop() {
  const unsigned long now = millis();

  // ---- Timed DHT11 read ----
  if (now - lastSensorRead >= SENSOR_INTERVAL) {
    lastSensorRead = now;
    curTemp = dht.readTemperature(); // Celsius
    curHumi = dht.readHumidity();

    // Select color based on rule:
    // ≤25 -> Blue; ≥30 -> Red; (25,30) -> Yellow
    if (!isnan(curTemp)) {
      if (curTemp <= 25.0) {
        targetColor = colorBlue;
      } else if (curTemp >= 30.0) {
        targetColor = colorRed;
      } else {
        targetColor = colorYellow;
      }
    } else {
      // If read fails, keep last color or default to Yellow
      targetColor = colorYellow;
    }
  }

  // ---- Breathing brightness (non-blocking) ----
  uint8_t brightness = breatheBrightness(now, BREATH_PERIOD);
  strip.setBrightness(brightness);

  // All LEDs same color
  for (int i = 0; i < NUM_LEDS; i++) {
    strip.setPixelColor(i, targetColor);
  }
  strip.show();

  // ---- Timed LCD update ----
  if (now - lastLcd >= LCD_INTERVAL) {
    lastLcd = now;
    lcd.setCursor(0, 0);
    lcd.print("T:");
    if (isnan(curTemp)) lcd.print("--.-");
    else                printPadded(lcd, curTemp, 4, 1); // width=4, 1 decimal place

    lcd.print("C H:");
    if (isnan(curHumi)) lcd.print("--");
    else                printPadded(lcd, curHumi, 2, 0);
    lcd.print("%  ");

    lcd.setCursor(0, 1);
    lcd.print("Mode:");
    if (targetColor == colorBlue)      lcd.print("BLUE     ");
    else if (targetColor == colorRed)  lcd.print("RED      ");
    else                               lcd.print("YELLOW   ");
  }
}

// Calculate 0..255 breathing brightness (sine wave: 0->255->0)
uint8_t breatheBrightness(unsigned long t, unsigned long period) {
  float phase = (2.0f * PI) * ( (t % period) / (float)period );
  float s = (sinf(phase) + 1.0f) * 0.5f;   // 0..1
  int val = (int)(s * 255.0f);
  if (val < 0)   val = 0;
  if (val > 255) val = 255;
  return (uint8_t)val;
}

// Print value to LCD with fixed width/decimals (pad with spaces to avoid ghosting)
void printPadded(LiquidCrystal_I2C &lcdRef, float value, int width, int decimals) {
  char buf[16];
  dtostrf(value, width + (decimals ? (decimals + 1) : 0), decimals, buf); // width includes decimal point
  lcdRef.print(buf);
}