#include <WiFi.h>
#include "time.h"
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <DHT.h>
#include "ThingSpeak.h"

// --- Configuración WiFi ---
const char* ssid     = "Wokwi-GUEST";
const char* password = "";

// --- Configuración ThingSpeak ---
unsigned long myChannelNumber = 3281865; // REEMPLAZAR con tu ID de canal
const char * myWriteAPIKey = "9T1WNJOVD8YSN4U8"; // REEMPLAZAR con tu API Key

// --- Configuración NTP ---
const char* ntpServer = "pool.ntp.org";
const long  gmtOffset_sec = -18000; 
const int   daylightOffset_sec = 0;   

// --- Hardware ---
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
Adafruit_SSD1306 oled(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

#define DHTPIN 4
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);

#define BUZZER_PIN 5
#define BTN_HORA 19
#define BTN_MODO 18
#define BTN_MIN  17

// --- Variables Globales ---
int alHoras = 7, alMinutos = 0;
bool modoAlarma = false;
float temperatura, humedad;
unsigned long ultimaActualizacionTS = 0;
const unsigned long intervaloTS = 20000; // ThingSpeak acepta datos cada 15-20 seg

WiFiClient client;

void setup() {
  Serial.begin(115200);
  
  pinMode(BTN_HORA, INPUT_PULLUP);
  pinMode(BTN_MODO, INPUT_PULLUP);
  pinMode(BTN_MIN,  INPUT_PULLUP);
  pinMode(BUZZER_PIN, OUTPUT);

  dht.begin();
  
  if(!oled.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { for(;;); }

  oled.clearDisplay();
  oled.setTextSize(1);
  oled.setTextColor(WHITE);
  oled.setCursor(0,0);
  oled.print("Iniciando...");
  oled.display();

  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }

  configTime(gmtOffset_sec, daylightOffset_sec, ntpServer);
  ThingSpeak.begin(client);
  oled.clearDisplay();
}

void loop() {
  struct tm timeinfo;
  if(!getLocalTime(&timeinfo)){
    Serial.println("Error al obtener la hora");
  }

  // --- Lectura de Sensores ---
  temperatura = dht.readTemperature();
  humedad = dht.readHumidity();

  // --- Lógica del Buzzer (Alarma > 40 grados) ---
  if (temperatura >= 40.0) {
    digitalWrite(BUZZER_PIN, HIGH);
  } else {
    digitalWrite(BUZZER_PIN, LOW);
  }

  // --- Lógica de Botones ---
  if (digitalRead(BTN_MODO) == LOW) {
    modoAlarma = !modoAlarma;
    delay(250);
    while(digitalRead(BTN_MODO) == LOW);
  }

  if (modoAlarma) {
    if (digitalRead(BTN_HORA) == LOW) { alHoras = (alHoras + 1) % 24; delay(200); }
    if (digitalRead(BTN_MIN) == LOW) { alMinutos = (alMinutos + 1) % 60; delay(200); }
  }

  // --- Enviar a ThingSpeak ---
  if (millis() - ultimaActualizacionTS > intervaloTS) {
    ThingSpeak.setField(1, temperatura);
    ThingSpeak.setField(2, humedad);
    int x = ThingSpeak.writeFields(myChannelNumber, myWriteAPIKey);
    if(x == 200) Serial.println("Canal actualizado en ThingSpeak");
    ultimaActualizacionTS = millis();
  }

  // --- Interfaz OLED ---
  oled.clearDisplay();
  oled.setTextSize(1);
  oled.setCursor(0,0);
  
  if(modoAlarma) {
    oled.print("CONFIG. ALARMA");
    oled.setTextSize(3);
    oled.setCursor(15, 25);
    if(alHoras < 10) oled.print("0");
    oled.print(alHoras); oled.print(":");
    if(alMinutos < 10) oled.print("0");
    oled.print(alMinutos);
  } else {
    oled.print("HORA ACTUAL");
    oled.setTextSize(3);
    oled.setCursor(10, 15);
    if(timeinfo.tm_hour < 10) oled.print("0");
    oled.print(timeinfo.tm_hour); oled.print(":");
    if(timeinfo.tm_min < 10) oled.print("0");
    oled.print(timeinfo.tm_min);
    
    oled.setTextSize(1);
    oled.setCursor(105, 30);
    if(timeinfo.tm_sec < 10) oled.print("0");
    oled.print(timeinfo.tm_sec);

    // Datos en la parte inferior
    oled.setCursor(0, 50);
    oled.print("T:"); oled.print(temperatura, 1); oled.print("C ");
    oled.print("H:"); oled.print(humedad, 0); oled.print("%");
  }
  
  oled.display();
  delay(100); 
}