// Include the necessary library for ESP32 WiFi functionalities
#include <WiFi.h>
#include <HTTPClient.h>
//Include the necessary library for sensor DHT11
#include <DHT.h>
//Include the necessary library for LCD
#include <LiquidCrystal_I2C.h>

// Define WiFi credentials
char ssid[] = "CELERITY_XIME_EXT";
char pass[] = "KEVIN5899";
// Define the Google Apps Script ID for the spreadsheet
String GAS_ID = "AKfycbyjrfSbogQvE_CTwtt5fqkaidjsRrfy6bGC_oZg13SL9_LRoGvYyufAV2unEMCezqgi";
// Define the domain name for the Google Apps Script
const char* host = "script.google.com";

//Declare pines for sensors DHT11
#define DHTTYPE DHT11   //Select type of DHT sensor
#define DHTPIN_amb 32
#define DHTPIN_1 33
#define DHTPIN_2 25
#define DHTPIN_3 26
//Configurate each DHT sensors
DHT dht_amb(DHTPIN_amb,DHTTYPE);
DHT dht_1(DHTPIN_1,DHTTYPE);
DHT dht_2(DHTPIN_2,DHTTYPE);
DHT dht_3(DHTPIN_3,DHTTYPE);
// Declare sensor variables
float Sensor1;
float Sensor2;
float Sensor3;
float Sensor4;
float Sensor5;
float Sensor6;
float Sensor7;
float Sensor8;

//Set the LCD number of columns and rows
int LCD_columns = 16;
int LCD_rows = 2;
//Configurate LCD with address and number of columns and rows
LiquidCrystal_I2C lcd(0x27, LCD_columns, LCD_rows);
//Create symbol of degree
byte degree[8] = {
  0b01110,
  0b10001,
  0b10001,
  0b10001,
  0b01110,
  0b00000,
  0b00000,
  0b00000
};

//Declare pines for buttons
#define button_amb 13
#define button_1 12
#define button_2 14
#define button_3 27
//Declare button and led for read pH
#define button_pH 4
#define led_pH 2
//Declare initial conditions of buttons
int state_amb = 0;
int state_1 = 0;
int state_2 = 0;
int state_3 = 0;
int state_pH = 0;
//Declare state to start of buttons
int start_amb = 0;
int start_1 = 0;
int start_2 = 0;
int start_3 = 0;
int start_pH = 0;

//Declare time variables
unsigned long previous_sensors = 0; //Previous time for sensors
unsigned long previous_pH = 0;      //Previous time for read pH
unsigned long previous_gsheet = 0;  //Previous time for export sensor data in google sheet
unsigned long current_time;         //Time value for indicate to current time
//Declare interval time for ever conditions
const long time_sensors = 500;      //Time value for read sensors data
const long time_pH = 86400000;        //Time value for read pH 86400000
const long time_gsheet = 10000;   //Time value for export sensor data in google sheet 1800000

// Setup function runs once when the ESP8266 starts
void setup() {
  // Initialize serial communication at 115200 baud rate
  Serial.begin(115200);
  
  // Start WiFi connection
  Serial.print("Connecting");
  WiFi.begin(ssid, pass); // Connect to the WiFi network
  // Wait until the ESP32 is successfully connected to the WiFi
  while (WiFi.status() != WL_CONNECTED){
    Serial.print(".");
  }

  //Configurate of buttons
  pinMode(button_amb, INPUT);
  pinMode(button_1, INPUT);
  pinMode(button_2, INPUT);
  pinMode(button_3, INPUT);
  pinMode(button_pH, INPUT);
  //Configurate of pH led
  pinMode(led_pH, OUTPUT);
  
  //Initialize DHT11 sensors
  dht_amb.begin();
  dht_1.begin();
  dht_2.begin();
  dht_3.begin();
  
  //Initialize LCD
  lcd.init();
  lcd.backlight();
  lcd.clear();
  //Display for initiate system
  for(int k=0 ; k<5 ; k++){
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Iniciando");
    lcd.setCursor(0, 1);
    lcd.print("sistema...");
    delay(1000);
    lcd.clear();
  }
}

// Main loop function runs repeatedly after the setup
void loop() {
  //Set the current time
  current_time = millis();
  
  //Read buttons
  state_amb = digitalRead(button_amb);
  state_1 = digitalRead(button_1);
  state_2 = digitalRead(button_2);
  state_3 = digitalRead(button_3);
  state_pH = digitalRead(button_pH);
  
  //Read and assign values of sensors
  if (current_time - previous_sensors >= time_sensors){
    previous_sensors = current_time;
    Sensor1 = dht_amb.readTemperature();
    Sensor2 = dht_amb.readHumidity();
    Sensor3 = dht_1.readTemperature();
    Sensor4 = dht_1.readHumidity();
    Sensor5 = dht_2.readTemperature();
    Sensor6 = dht_2.readHumidity();
    Sensor7 = dht_3.readTemperature();
    Sensor8 = dht_3.readHumidity();
  }

  //Warning for read pH value every defined time
  if (current_time - previous_pH >= time_pH){
    previous_pH = current_time;
    digitalWrite(led_pH, HIGH);
    //for(int k=0 ; k<5 ; k++){
      //lcd.clear();
      //lcd.setCursor(5, 0);
      //lcd.print("ALERTA");
      //lcd.setCursor(4, 1);
      //lcd.print("Medir pH");
      //delay(1000);
      //lcd.clear();}
  }

  //Call the functions for read state buttons and display sensors in LCD
  state_buttons();
  display_LCD();
  // Call the function to update the Google Sheet with sensor values
  if (current_time - previous_gsheet >= time_gsheet){
    previous_gsheet = current_time;
    update_google_sheet();
  }
}

// Function to send sensor data to the Google Sheet
void update_google_sheet(){
    Serial.print("connecting to ");
    Serial.println(host);

    // Create a secure WiFi client instance
    WiFiClientSecure client;

    // Define the port for HTTPS connection
    const int httpPort = 443; // 80 is for HTTP / 443 is for HTTPS!

    // Set the client to insecure mode to avoid security conflicts
    client.setInsecure();

    // Try to connect to the Google Apps Script host
    if (!client.connect(host, httpPort)) { 
      Serial.println("connection failed");
      return;
    }

    // Construct the URL with sensor data as parameters
    String url = "/macros/s/" + GAS_ID + "/exec?T1=";
    url += String(Sensor1);
    url += "&T2=" + String(Sensor2);
    url += "&T3=" + String(Sensor3);
    url += "&T4=" + String(Sensor4);
    url += "&T5=" + String(Sensor5);
    url += "&T6=" + String(Sensor6);
    url += "&T7=" + String(Sensor7);
    url += "&T8=" + String(Sensor8);

    Serial.print("Requesting URL: ");
    Serial.println(url);

    // Send the GET request to the Google Apps Script
    client.print(String("GET ") + url + " HTTP/1.1\r\n" +
                 "Host: " + host + "\r\n" + 
                 "Connection: close\r\n\r\n");

    Serial.println();
    Serial.println("closing connection");  
}

void state_buttons(){
  //Configurate buttons for ever conditions or environment
  if(state_amb == 1){
    lcd.clear();
    start_amb = 1;
    start_1 = 0;
    start_2 = 0;
    start_3 = 0;
    delay(300);
  }
  if(state_1 == 1){
    lcd.clear();
    start_amb = 0;
    start_1 = 1;
    start_2 = 0;
    start_3 = 0;
    delay(300);
  }
  if(state_2 == 1){
    lcd.clear();
    start_amb = 0;
    start_1 = 0;
    start_2 = 1;
    start_3 = 0;
    delay(300);
  }
  if(state_3 == 1){
    lcd.clear();
    start_amb = 0;
    start_1 = 0;
    start_2 = 0;
    start_3 = 1;
    delay(300);
  }
  if(state_pH == 1){
    digitalWrite(led_pH, LOW);
    delay(300);
  }
}

//Function for display the differents environments
void display_LCD(){
  //Wait condition until an environment is selected
  if (start_amb == 0 && start_1 == 0 && start_2 == 0 && start_3 == 0){
    lcd.setCursor(0, 0);
    lcd.print("Seleccione");
    lcd.setCursor(0, 1);
    lcd.print("una lectura");  
    }
  //Conditions to each button for visualize
  if (start_amb == 1){
    lcd.setCursor(0, 0);
    lcd.print("Temp: " + String(Sensor1));
    lcd.createChar(0, degree);
    lcd.setCursor(13, 0);
    lcd.write(0);
    lcd.setCursor(14,0);
    lcd.print("C");
    lcd.setCursor(0, 1);
    lcd.print("Humedad: "+ String(Sensor2) + " %");
  }
  if (start_1 == 1){
    lcd.print("Temp: " + String(Sensor3));
    lcd.createChar(0, degree);
    lcd.setCursor(13, 0);
    lcd.write(0);
    lcd.setCursor(14,0);
    lcd.print("C");
    lcd.setCursor(0, 1);
    lcd.print("Humedad: "+ String(Sensor4) + " %");
  }
  if (start_2 == 1){
    lcd.print("Temp: " + String(Sensor5));
    lcd.createChar(0, degree);
    lcd.setCursor(13, 0);
    lcd.write(0);
    lcd.setCursor(14,0);
    lcd.print("C");
    lcd.setCursor(0, 1);
    lcd.print("Humedad: "+ String(Sensor6) + " %");
  }
  if (start_3 == 1){
    lcd.print("Temp: " + String(Sensor7));
    lcd.createChar(0, degree);
    lcd.setCursor(13, 0);
    lcd.write(0);
    lcd.setCursor(14,0);
    lcd.print("C");
    lcd.setCursor(0, 1);
    lcd.print("Humedad: "+ String(Sensor8) + " %");
  }
}