/* 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

//naložiti drivere za ESP-WROOM-32 https://developers.wia.io/release/things/esp-wroom-32
//uporabimo FireBeetle-ESP32 ploščico
//podrobnosti o ploščici: https://docs.espressif.com/projects/esp-idf/en/latest/esp32/hw-reference/esp32/get-started-devkitc.html
//datasheet: https://espressif.com/sites/default/files/documentation/esp32-wroom-32_datasheet_en.pdf

//dht sensor library: https://github.com/beegee-tokyo/DHTesp

//tutorial za ssd1306: https://randomnerdtutorials.com/esp32-ssd1306-oled-display-arduino-ide/

#include <WiFi.h>
#include <HTTPClient.h>
#include "DHTesp.h"
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

const int DHT_PIN = 15;

DHTesp dhtSensor;

Adafruit_SSD1306 display = Adafruit_SSD1306(128, 32, &Wire);

//pusti kot je, povezava je od wowki
//const char* ssid     = "Xiaomi 11T Pro";
//const char* password = "bobosmrade";

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";
const char* serverName = "http://ec2-3-67-36-249.eu-central-1.compute.amazonaws.com/log-data?";

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

String sensorName = "Merilec18";
String sensorLocation = "Ljubljana";

//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

  display.begin(SSD1306_SWITCHCAPVCC, 0x3C); // Address 0x3C for 128x32

  // Clear the buffer.
  display.clearDisplay();
  display.display();

  Serial.print("Connecting to WiFi");

  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(0,0);
  display.print("Connecting to SSID:\n");
  display.print(ssid);
  display.display(); // actually display all of the above

  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.print(".");
  }

  Serial.println(" Connected!");
  
  display.clearDisplay();
  display.setCursor(0,0);
  display.print("Connected!");
  display.display(); // actually display all of the above

  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;

      display.clearDisplay();
      display.setCursor(0,0);
      display.print("Status: Sending\n");
      display.print("Lux: " + String(lux, 1) +" L\n");
      display.print("Tem: " + String(data.temperature, 2) +"C\n");
      display.print("Hum: " + String(data.humidity, 1) +"%\n");
      display.display(); // actually display all of the above

      http.begin(client, serverName);
      
      //ustvarimo željene headerje
      http.addHeader("Content-Type", "image/gif");
      http.addHeader("Connection", "Keep-Alive"); //brez tega ne gre, enkrat pošlje potem pa več ne
      //pripravimo request
      String httpRequestData = "id=" + sensorName + "&geo="+ sensorLocation + "&temp=" + String(data.temperature, 2)
                            + "&hum=" + String(data.humidity, 1) + "&lux=" + String(lux, 1) + "";

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

      String serverPath = serverName + httpRequestData;
      
      // Your Domain name with URL path or IP address with path
      http.begin(serverPath.c_str());

      //pošljemo POST request
      int httpResponseCode = http.GET();
      
      if (httpResponseCode>0) {
        Serial.print("HTTP Response code: ");
        Serial.println(httpResponseCode);

        display.clearDisplay();
        display.setCursor(0,0);
        display.print("Succ: "+ String(httpResponseCode) +"\n");
        display.print("Lux: " + String(lux, 1) +" L\n");
        display.print("Tem: " + String(data.temperature, 2) +"C\n");
        display.print("Hum: " + String(data.humidity, 1) +"%\n");
        display.display(); // actually display all of the above

      }
      else {
        Serial.print("Error code: ");
        Serial.println(httpResponseCode);

        display.clearDisplay();
        display.setCursor(0,0);
        display.print("Err: "+ String(httpResponseCode) +"\n");
        display.print("Lux: " + String(lux, 1) +" L\n");
        display.print("Tem: " + String(data.temperature, 2) +"C\n");
        display.print("Hum: " + String(data.humidity, 1) +"%\n");
        display.display(); // actually display all of the above

      }
      http.end();
    }
    else {
      Serial.println("WiFi Disconnected");

      display.clearDisplay();
      display.setCursor(0,0);
      display.print("WiFi Disconnected!\n");
      display.display(); // actually display all of the above
    }
    
  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 10 sekund
  delay(10000);  
}