// ESP32 data loger to file on your server and acces to file from
// web browser or mobile phone.
// In this example logging data from temp. and humi. sensor and
// NTP time.
// monitor images:
// http://girus.5xs.sk/esp32/2024-03-19%2015.28.13.png
// http://girus.5xs.sk/esp32/2024-03-19%2015.22.26.png

#include <WiFi.h>
#include <HTTPClient.h>
#include <time.h>
#define NTP_SERVER "europe.pool.ntp.org"
#define UTC_OFFSET 3600
#define UTC_OFFSET_DST 0
#define LED 2

#include "Wire.h"
#include "SHT31.h"
#define SHT31_ADDRESS 0x44
SHT31 sht;

int ledState = 0;
int reebot = 0;
uint32_t xx = 10000 + millis();
String message = ".";
String out = ".";
char cas[30];

void printLocalTime() {
  time_t rawtime;
  struct tm ti;
  if (!getLocalTime(&ti)) {
    Serial.println("Connection Error");
    return;
  }

  static const char wday_name[][4] = {
    "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
  };
  static const char mon_name[][4] = {
    "Jan", "Feb", "Mar", "Apr", "May", "Jun",
    "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
  };

  //Serial.println(&ti, "%H:%M:%S %d.%m.%Y  %Z");
  sprintf(cas, "%s %i.%s %.2i:%.2i", wday_name[ti.tm_wday], ti.tm_mday, mon_name[ti.tm_mon], ti.tm_hour, ti.tm_min);
  Serial.println(&ti);
}

void setup() {
  Serial.begin(115200);
  pinMode(LED, OUTPUT);

  Serial.println("Connecting to WiFi ");

  WiFi.begin("Wokwi-GUEST", "");
  while (WiFi.status() != WL_CONNECTED) {
    Serial.print("#");
    delay(250);
  }
  Serial.println();
  Serial.println("WiFi connected");
  Serial.print("IP address: ");
  Serial.println(WiFi.localIP());

  Serial.println("Updating time...");

  configTime(UTC_OFFSET, UTC_OFFSET_DST, NTP_SERVER);

  Wire.begin(26, 27, 100000);
  sht.begin();
  uint16_t stat = sht.readStatus();
  Serial.printf("SHT31 Status: %X\n", stat);
}


void loop() {
  ledState = !ledState;
  digitalWrite(LED, ledState);  

  printLocalTime();

  sht.read(false);  //  default = true/fast       slow = false
  float temp = sht.getTemperature();
  float humi = sht.getHumidity();
  Serial.printf("temp:%.2f\thumi:%.2f\r\n", temp, humi);
  out = "time: " + String(cas) + "\ttemp: " + String(temp) + "\thumi: " + String(humi);
  log();

  delay(60000);
}


void log() {
   if (reebot == 0) {
     message = "message=---ESP32 TempHumi (POWERON_RESET)\n";
     reebot = 1;
   } else {
  message = "message=[ESP32 WOKWI] > " + String(out) + ";\n";
   }

  HTTPClient http;
  http.begin("http://your.server.php/esp32/upload.php");  // Nahraďte URL adresou Vášho servera
  //http.addHeader("Content-Type", "text/plain");
  http.addHeader("Content-Type", "application/x-www-form-urlencoded");

  int httpResponseCode = http.POST(message);
  if (httpResponseCode == 200) {
    Serial.printf("httpResponseCode: %d\n", httpResponseCode);
    Serial.println(message);
  } else {
    Serial.printf("httpResponseCode: %d\n", httpResponseCode);
  }
  http.end();
}


/* ---------- upload.php -------------

<?php
// Define the expected format of the data from ESP32
$data_key = "message"; // Replace with the key used in your ESP32 code to send data
$file = "esp.txt";
// Check if the request method is POST
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    
    // Check if the data key is present in the request body
    if (isset($_POST[$data_key])) {
        $received_data = $_POST[$data_key];
        
         // file_put_contents($file, $received_data);
        if (File_Exists ($file)) {
            $fp = FOpen ($file, "r");
             $data = FRead ($fp, FileSize($file));
             FClose($fp);
             } 
        $fp = FOpen ($file, "w");
          $fileSize = filesize($file);
            //FWrite ($fp, $fileSize);
         FWrite ($fp, "<b>" . $received_data . "</b>" . $data);
         FClose ($fp);
         echo 'Data received successfully!<br><br>';
        
         } 
    else {
        echo 'Error: Missing data key in request.';
         } 
    
    
    if (isset($_POST["cls"])) {
        
        $myfile = fopen($file, "w") or die("Unable to open file!");
         fclose($myfile);
        
         } 
    
    } 
else {
    echo "Error: This script only accepts POST requests.<br>\n";
     } 

?>


-------------------------------------------------- */