#include <WiFi.h>
#include "ThingSpeak.h"
#include "secrets.h"
#include <DHTesp.h>
#include <LiquidCrystal_I2C.h>

#define red 14
#define yellow 12
#define green 13
#define buzzer 32
#define sensor 5
#define DHT_PIN 19

DHTesp dhtSensor;
LiquidCrystal_I2C lcd(0x27, 16, 2);


//Initialize the LCD display

unsigned long myChannelNumber = SECRET_CH_ID;
const char * myWriteAPIKey = SECRET_WRITE_APIKEY;

char ssid[] = SECRET_SSID;   // your network SSID (name)
char pass[] = SECRET_PASS;   // your network password
WiFiClient  client;

String alerta = "N";

void sendData (int gas, int temp, int hum, String alerta) {
  ThingSpeak.setField(1, gas);
  ThingSpeak.setField(2, temp);
  ThingSpeak.setField(3, hum);
  ThingSpeak.setField(4, alerta);
  int httpCode = ThingSpeak.writeFields(myChannelNumber, myWriteAPIKey);
  
  if (httpCode == 200) {
    Serial.println("Channel write successful.");
  }
  else {
    Serial.println("Problem writing to channel. HTTP error code " + String(httpCode));
  }
}

void setup() {
  Serial.begin(115200);
  lcd.init(); // empieza el lcd
  lcd.backlight();
  dhtSensor.setup(DHT_PIN, DHTesp::DHT22);
  delay(100);

  WiFi.mode(WIFI_STA);
  ThingSpeak.begin(client); //inicializar con parámetro cliente

  pinMode(red, OUTPUT);
  pinMode(yellow, OUTPUT);
  pinMode(green, OUTPUT);
  pinMode(buzzer, OUTPUT);
}

void HandleResponse() {
  TempAndHumidity data = dhtSensor.getTempAndHumidity();
  float temperature = (data.temperature);
  float humidity = (data.humidity);

  int value = analogRead(sensor);
  value = map(value, 0, 4095, 0, 100);

  if (temperature <= 28) { //Normal
    digitalWrite(red, 0);
    digitalWrite(yellow, 0);
    digitalWrite(green, 1);
    digitalWrite(buzzer, LOW);
    noTone(buzzer);
    alerta = "Nom";
    sendData(temperature, humidity, value, alerta);
  } 
  if (temperature < 28 && temperature <= 35) { //Advertencia
    digitalWrite(red, 0);
    digitalWrite(yellow, 1);
    digitalWrite(green, 0);
    digitalWrite(buzzer, LOW);
    noTone(buzzer);
    alerta = "Ad";
    sendData(temperature, humidity, value, alerta);
  }
  if (temperature > 35) { //Crítica
    digitalWrite(red, 0);
    digitalWrite(yellow, 1);
    digitalWrite(green, 1);
    digitalWrite(buzzer, HIGH);
    tone(buzzer, 100);
    alerta = "C";
    sendData(temperature, humidity, value, alerta);
  }
  if (temperature > 40) { //Alerta Crítica
    digitalWrite(red, 1);
    digitalWrite(yellow, 0);
    digitalWrite(green, 0);
    digitalWrite(buzzer, HIGH);
    tone(buzzer, 100);
    alerta = "Ur";
    sendData(temperature, humidity, value, alerta);
  }

  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Alerta:");
  lcd.print(alerta); //imprime alerta
  lcd.setCursor(0, 1);
  lcd.print("Temp:");
  lcd.print(temperature); //imprime temp
  delay(2000);
}

void loop() {
  HandleResponse();

  if (WiFi.status() != WL_CONNECTED) {
    Serial.print("Attempting to connect to SSID: ");
    Serial.println(SECRET_SSID);
    while (WiFi.status() != WL_CONNECTED) {
      WiFi.begin(ssid, pass); // Connect to WPA/WPA2 network. Change this line if using open or WEP network
      Serial.print(".");
      delay(5000);
    }
    Serial.println("\nConnected.");
  }
  delay(20000);
}