/*
 // JWSmythe autoupdater test 1.0
 // (c) JWSmythe 220230920
 // http basic pars from:  https://RandomNerdTutorials.com/esp32-http-get-post-arduino/
 // OTA over http from: https://github.com/espressif/arduino-esp32/blob/master/libraries/HTTPUpdate/examples/httpUpdate/httpUpdate.ino
 // 
 // BTW, if it hangs at "Connecting...", reload the sim.  It has problems 
 // reaching the Internet sometimes.  That's a Wokwi problem, not an ESP* problem.
*/

#include <WiFi.h>
#include <HTTPClient.h>
#include <HTTPUpdate.h>

const char* ssid = "Wokwi-GUEST";
const char* password = "";
String version_url  = "http://ota.hacker4hire.com/current_version.txt";
String firmware_url = "http://ota.hacker4hire.com/firmware";
String newbin_url   = "";
unsigned long software_version = 2023092001; // yyyymmddhhmm
unsigned long update_version = 0;
String http_string = "";  // Holding variable.
unsigned long lastTime = 0;
unsigned long timerDelay = 60;

void setup() {
  Serial.begin(115200); 

  WiFi.begin(ssid, password);
  Serial.println("Connecting");
  while(WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.print("Connected to WiFi network with IP Address: ");
  Serial.println(WiFi.localIP());
}

/* *** BEGIN These are used by the updater below *** */
void update_started() {
  Serial.println("CALLBACK:  HTTP update process started");
}

void update_finished() {
  Serial.println("CALLBACK:  HTTP update process finished");
}

void update_progress(int cur, int total) {
  Serial.printf("CALLBACK:  HTTP update process at %d of %d bytes...\n", cur, total);
}

void update_error(int err) {
  Serial.printf("CALLBACK:  HTTP update fatal error code %d\n", err);
}

/* *** END These are used by the updater below *** */

void loop() {
  if ((millis() - lastTime) > timerDelay) {
    if(WiFi.status()== WL_CONNECTED){
      HTTPClient http;

      http.begin(version_url.c_str());

      int httpResponseCode = http.GET();
      
        if (httpResponseCode>0) {
          Serial.print("HTTP Response code: ");
          Serial.println(httpResponseCode);
          http_string = http.getString();
          update_version = http_string.toInt();
          Serial.print("Current FW version: "); Serial.println(software_version);
          Serial.print("Server  FW version: "); Serial.println(update_version);
          // ***** BEGIN UPDATER CODE *****
          if (software_version != update_version){
            newbin_url = firmware_url + "." + update_version + ".bin";
            Serial.print("New firmware version available.  Updating to "); Serial.print(newbin_url); Serial.print("\n");

            httpUpdate.onStart(update_started);
            httpUpdate.onEnd(update_finished);
            httpUpdate.onProgress(update_progress);
            httpUpdate.onError(update_error);
            
            //t_httpUpdate_return ret = httpUpdate.update(client, "newbin_url");
            t_httpUpdate_return ret = httpUpdate.update(http, newbin_url);
            // Or:
            //t_httpUpdate_return ret = httpUpdate.update(client, "server", 80, "/file.bin");

            switch (ret) {
              case HTTP_UPDATE_FAILED:
                Serial.printf("HTTP_UPDATE_FAILED Error (%d): %s\n", httpUpdate.getLastError(), httpUpdate.getLastErrorString().c_str());
                break;

              case HTTP_UPDATE_NO_UPDATES:
                Serial.println("HTTP_UPDATE_NO_UPDATES");
                break;

              case HTTP_UPDATE_OK:
                Serial.println("HTTP_UPDATE_OK");
                break;

            }
          }
          // ***** END UPDATER CODE *****
        }else{
          Serial.print("Error code: ");
          Serial.println(httpResponseCode);
        }
      // Free resources
      http.end();
    }else{
      Serial.println("WiFi Disconnected");
    }
    lastTime = millis();
  }
}