/*
  Rui Santos
  Complete project details at https://RandomNerdTutorials.com

  Permission is hereby granted, free of charge, to any person obtaining a copy
  of this software and associated documentation files.

  The above copyright notice and this permission notice shall be included in all
  copies or substantial portions of the Software.
*/

// Import required libraries
#include <ESP8266WiFi.h>
#include <ESPAsyncTCP.h>
#include <ESPAsyncWebServer.h>
#include <FS.h>
#include <Wire.h>
#include <OneWire.h>
#include <DallasTemperature.h>
#include "LittleFS.h"


// #include <Adafruit_Sensor.h>
// #include <Adafruit_BME280.h>
OneWire oneWire(0);  //oneWire instance to communicate with any OneWire devices
DallasTemperature sensors(&oneWire);  // Pass our oneWire reference to Dallas Temperature.

// Adafruit_BME280 bme; // I2C
//Adafruit_BME280 bme(BME_CS); // hardware SPI
//Adafruit_BME280 bme(BME_CS, BME_MOSI, BME_MISO, BME_SCK); // software SPI

// Replace with your network credentials
const char* ssid = "xxxx";  // wifi ssid
const char* password = "xxx";  // wifi password

// Set LED GPIO
const int ledPin = 2;
// Stores LED state
String ledState;

// Create AsyncWebServer object on port 80
AsyncWebServer server(80);

String getTemperature() {
  float temperature = get_temperature_from_ds18b20(0);
  // Read temperature as Fahrenheit (isFahrenheit = true)
  //float t = dht.readTemperature(true);
  Serial.println(temperature);
  return String(temperature);
}
float get_temperature_from_ds18b20(int sensorIndex){
  sensors.requestTemperatures();
  float temp = sensors.getTempCByIndex(sensorIndex);
  Serial.print("ds18b20 Temp= ");
  Serial.println(temp);
  return temp;
}
String getHumidity() {
  return String(1);
}

String getPressure() {
  return String(1);
}

// Replaces placeholder with LED state value
String processor(const String& var){
  Serial.println(var);
  if(var == "STATE"){
    if(digitalRead(ledPin)){
      ledState = "ON";
    }
    else{
      ledState = "OFF";
    }
    Serial.print(ledState);
    return ledState;
  }
  else if (var == "TEMPERATURE"){
    return getTemperature();
  }
  else if (var == "HUMIDITY"){
    return getHumidity();
  }
  else if (var == "PRESSURE"){
    return getPressure();
  }
}

void setup(){
  // Serial port for debugging purposes
  Serial.begin(115200);
  pinMode(ledPin, OUTPUT);
  sensors.begin(); // Start up the Dallas Temperature library

  // Initialize the sensor
  // if (!bme.begin(0x76)) {
  //   Serial.println("Could not find a valid BME280 sensor, check wiring!");
  //   while (1);
  // }
  initialize_SPIFFS();
    if(!LittleFS.begin()){
    Serial.println("An Error has occurred while mounting LittleFS");
    return;
    }
  // Connect to Wi-Fi
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to WiFi..");
  }

  // Print ESP32 Local IP Address
  Serial.println(WiFi.localIP());

  // Route for root / web page
  server.on("/", HTTP_GET, [](AsyncWebServerRequest *request){
    request->send(SPIFFS, "/index.html", String(), false, processor);
  });

  // Route to load style.css file
  server.on("/style.css", HTTP_GET, [](AsyncWebServerRequest *request){
    request->send(SPIFFS, "/style.css", "text/css");
  });

  // Route to set GPIO to HIGH
  server.on("/on", HTTP_GET, [](AsyncWebServerRequest *request){
    digitalWrite(ledPin, HIGH);
    request->send(SPIFFS, "/index.html", String(), false, processor);
  });

  // Route to set GPIO to LOW
  server.on("/off", HTTP_GET, [](AsyncWebServerRequest *request){
    digitalWrite(ledPin, LOW);
    request->send(SPIFFS, "/index.html", String(), false, processor);
  });

  server.on("/temperature", HTTP_GET, [](AsyncWebServerRequest *request){
    request->send_P(200, "text/plain", getTemperature().c_str());
  });

  server.on("/humidity", HTTP_GET, [](AsyncWebServerRequest *request){
    request->send_P(200, "text/plain", getHumidity().c_str());
  });

  server.on("/pressure", HTTP_GET, [](AsyncWebServerRequest *request){
    request->send_P(200, "text/plain", getPressure().c_str());
  });

    Serial.println("Starting server ...");
  // Start server
  server.begin();
  Serial.println("Done.");
}

void loop(){

}
void initialize_SPIFFS(){
    // FUNCION PARA INICIAR Y COMPROBAR FICHEROS EN SPI Flash File System
    Serial.printf("\nInitializing spiffs...");
    LittleFS.begin();
    if(!LittleFS.begin()){
    Serial.println("An Error has occurred while mounting LittleFS");
    return;
    }
    Serial.printf("\nFound following files in SPIFFS:\n");
    for (auto folder :  { "/", "/data" }){
        Dir root = LittleFS.openDir(folder);
        while (root.next()) {
            File file = root.openFile("r");
            Serial.printf("\t%s%s (size=%i)\n", folder, root.fileName(), file.size());
            // Serial.println(" CONTENT(start): ============================================= ");
            // while(file.available()){
            //     Serial.write(file.read());
            // }
            // Serial.println("");
            // Serial.println(" CONTENT(end):   ============================================= ");
            file.close();
        }
    }
    Serial.println("End of initializing spiffs.");
}