#include <WiFi.h>
#include <HTTPClient.h>
#include <DHT.h>
#include <LiquidCrystal_I2C.h>

// --------- WiFi (Wokwi) ---------
const char* WIFI_SSID     = "Wokwi-GUEST";
const char* WIFI_PASSWORD = "";
const char* THINGSPEAK_API_KEY = "52LB2FG9BXVLSBFU"; // thingspeak

// --------- Pinos ---------
#define PIN_DHT    15
#define DHTTYPE    DHT22
#define PIN_LDR    34          // ADC-only (0..4095 no ESP32)

#define PIN_FAN    16          // LED/Ventilador
#define PIN_HEAT   17          // LED/Aquecedor
#define PIN_CURT   18          // LED/Cortina (fechar)
#define PIN_BUZZ   27          // Buzzer

// I2C do LCD no ESP32: SDA=21, SCL=22
LiquidCrystal_I2C lcd(0x27, 16, 2);
DHT dht(PIN_DHT, DHTTYPE);

// --------- Setpoints / Histerese ---------
float T_FAN_ON  = 28.0, T_FAN_OFF = 26.0;
float T_HEAT_ON = 18.0, T_HEAT_OFF = 20.0;
int   LUX_CLOSE = 2500, LUX_OPEN  = 2000;

// --------- Estados ---------
bool fanOn=false, heatOn=false, curtainClosed=false;

unsigned long lastPost=0;
const unsigned long POST_PERIOD_MS=20000; // ThingSpeak >=15 s

/// --------- Média móvel LDR ---------
const int LDR_NSAMPLES = 8;
int readLdrAveraged() {
  long acc = 0;
  for (int i=0; i<LDR_NSAMPLES; i++) {
    acc += analogRead(PIN_LDR);
    delay(2);
  }
  return (int)(acc / LDR_NSAMPLES);
}

void connectWiFi() {
  WiFi.mode(WIFI_STA);
  WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
  while (WiFi.status() != WL_CONNECTED) { delay(200); }
}

void setup() {
  Serial.begin(115200);

  pinMode(PIN_FAN, OUTPUT);
  pinMode(PIN_HEAT, OUTPUT);
  pinMode(PIN_CURT, OUTPUT);
  pinMode(PIN_BUZZ, OUTPUT);
  digitalWrite(PIN_FAN, LOW);
  digitalWrite(PIN_HEAT, LOW);
  digitalWrite(PIN_CURT, LOW);
  digitalWrite(PIN_BUZZ, LOW);

  dht.begin();
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0,0); lcd.print("Estufa Online");
  lcd.setCursor(0,1); lcd.print("Inicializando");

  connectWiFi();
  delay(800);
}

void loop() {
  // --- Sensores ---
  float hum  = dht.readHumidity();
  float tAir = dht.readTemperature(); // °C
  int   lux  = readLdrAveraged();     // 0..4095

  if (isnan(hum) || isnan(tAir)) {
    Serial.println("Falha na leitura do DHT22.");
  }

  // --- Controle com histerese ---
  // Ventilador
  if (!fanOn && tAir >= T_FAN_ON)       fanOn = true;
  else if (fanOn && tAir <= T_FAN_OFF)  fanOn = false;

  // Aquecedor
  if (!heatOn && tAir <= T_HEAT_ON)       heatOn = true;
  else if (heatOn && tAir >= T_HEAT_OFF)  heatOn = false;

  // Cortina (fechar = reduzir luz)
  if (!curtainClosed && lux >= LUX_CLOSE)        curtainClosed = true;
  else if (curtainClosed && lux <= LUX_OPEN)     curtainClosed = false;

  // --- Saídas físicas ---
  digitalWrite(PIN_FAN,  fanOn ? HIGH : LOW);
  digitalWrite(PIN_HEAT, heatOn ? HIGH : LOW);
  digitalWrite(PIN_CURT, curtainClosed ? HIGH : LOW);

  // Alarme (extremos)
  if (tAir >= 40.0 || tAir <= 10.0) {
    tone(PIN_BUZZ, 2000, 150);
  }

  // --- LCD ---
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("T:");
  lcd.print(isnan(tAir)?0:tAir,1);
  lcd.print(" H:");
  lcd.print(isnan(hum)?0:hum,0);
  lcd.print("%");
  lcd.setCursor(0,1);
  lcd.print("L:");
  lcd.print(lux);
  /*lcd.print(" Vent");
  lcd.print(fanOn?1:0);
  lcd.print(" Aq");
  lcd.print(heatOn?1:0);
  lcd.print(" Cort");
  lcd.print(curtainClosed?1:0);*/

  // --- ThingSpeak (Field1..Field6) ---
  if (WiFi.status()==WL_CONNECTED && (millis()-lastPost)>=POST_PERIOD_MS) {
    lastPost = millis();
    HTTPClient http;
    String url = "http://api.thingspeak.com/update?api_key=" + String(THINGSPEAK_API_KEY) +
                 "&field1=" + String(isnan(tAir)?0:tAir, 2) +
                 "&field2=" + String(isnan(hum)?0:hum, 1) +
                 "&field3=" + String(lux) +
                 "&field4=" + String(fanOn?1:0) +
                 "&field5=" + String(heatOn?1:0) +
                 "&field6=" + String(curtainClosed?1:0);
    http.begin(url);
    int code = http.GET();
    Serial.print("ThingSpeak: "); Serial.println(code);
    http.end();
  }

  // --- Log Serial (em português) ---
  Serial.printf("T=%.2fC  H=%.0f%%  L=%d  Vent=%d  Aquec=%d  Cort=%d\n",
                isnan(tAir)?0:tAir, isnan(hum)?0:hum, lux, fanOn, heatOn, curtainClosed);

  delay(500);
}