/* ESP32 WiFi Scanning example */
//povzeto po: https://randomnerdtutorials.com/esp32-esp8266-mysql-database-php/
//kaj si začneti z lux podatki: https://docs.wokwi.com/parts/wokwi-photoresistor-sensor


#include <WiFi.h>
#include <HTTPClient.h>
#include "DHTesp.h"

const int DHT_PIN = 15;

DHTesp dhtSensor;

//pusti kot je, povezava je od wowki
const char* ssid     = "Wokwi-GUEST";
const char* password = "";

//naslov spletnega mesta, kjer je API. Obvezna uporaba HTTP (ne HTTPS)!
const char* serverName = "http://digitalnidvojcek.000webhostapp.com/post-esp-data.php";

//v primeru dodatne varnosti se lahko generira API key
String apiKeyValue = "tPmAT5Ab3j7F9";

String sensorName = "DHT22+photoresistor";
String sensorLocation = "simulator";

//vrednosti za izračun svetlosti
const float GAMMA = 0.7;
const float RL10 = 50;

void setup() {

  pinMode(34, ANALOG); //vhod 34 uporabljamo kot analognega

  Serial.begin(9600); //za povezavo na internet uporabljamo baud 9600
  Serial.print("Connecting to WiFi");
  WiFi.begin("Wokwi-GUEST", "", 6);
  while (WiFi.status() != WL_CONNECTED) {
    delay(100);
    Serial.print(".");
  }
  Serial.println(" Connected!");

  Serial.begin(115200); //za branje senzorjev uporabljamo baud 115200
  dhtSensor.setup(DHT_PIN, DHTesp::DHT22);

}

void loop() {

  TempAndHumidity  data = dhtSensor.getTempAndHumidity();
  
  //uporabljamo 10 bitno kodiranje
  analogReadResolution(10);
  int analogValue = analogRead(34);
  float voltage = analogValue / 1024. * 5;
  float resistance = 2000 * voltage / (1 - voltage / 5);
  float lux = pow(RL10 * 1e3 * pow(10, GAMMA) / resistance, (1 / GAMMA));

  if(WiFi.status()== WL_CONNECTED){
      WiFiClient client;
      HTTPClient http;
      
      http.begin(client, serverName);
      
      //ustvarimo željene headerje
      http.addHeader("Content-Type", "application/x-www-form-urlencoded");
      http.addHeader("Connection", "Keep-Alive"); //brez tega ne gre, enkrat pošlje potem pa več ne
      //pripravimo request
      String httpRequestData = "api_key=" + apiKeyValue + "&sensor=" + sensorName
                            + "&location=" + sensorLocation + "&value1=" + String(data.temperature, 2)
                            + "&value2=" + String(data.humidity, 1) + "&value3=" + String(lux, 1) + "";

      Serial.print("httpRequestData: ");
      Serial.println(httpRequestData);

      //pošljemo POST request
      int httpResponseCode = http.POST(httpRequestData);
      
      if (httpResponseCode>0) {
        Serial.print("HTTP Response code: ");
        Serial.println(httpResponseCode);
      }
      else {
        Serial.print("Error code: ");
        Serial.println(httpResponseCode);
      }
      http.end();
    }
    else {
      Serial.println("WiFi Disconnected");
    }
    

  Serial.println("analogValue: " + String(analogValue, 2));
  Serial.println("voltage: " + String(voltage, 2) + "V");
  Serial.println("resistance: " + String(resistance, 2) + " ohm");
  Serial.println("lux: " + String(lux, 2) + " lux");
  
  Serial.println("Temp: " + String(data.temperature, 2) + "°C");
  Serial.println("Humidity: " + String(data.humidity, 1) + "%");
  Serial.println("---");
  //ponovimo vsakih 30 sekund
  delay(10000);  

}













/*#include "WiFi.h"

void setup() {
  Serial.begin(115200);
  Serial.println("Initializing WiFi...");
  WiFi.mode(WIFI_STA);
  Serial.println("Setup done!");
}

void loop() {
  Serial.println("Scanning...");

  // WiFi.scanNetworks will return the number of networks found
  int n = WiFi.scanNetworks();
  Serial.println("Scan done!");
  if (n == 0) {
    Serial.println("No networks found.");
  } else {
    Serial.println();
    Serial.print(n);
    Serial.println(" networks found");
    for (int i = 0; i < n; ++i) {
      // Print SSID and RSSI for each network found
      Serial.print(i + 1);
      Serial.print(": ");
      Serial.print(WiFi.SSID(i));
      Serial.print(" (");
      Serial.print(WiFi.RSSI(i));
      Serial.print(")");
      Serial.println((WiFi.encryptionType(i) == WIFI_AUTH_OPEN) ? " " : "*");
      delay(10);
    }
  }
  Serial.println("");

  // Wait a bit before scanning again
  delay(5000);
}*/