/*
 * This example demonstrates how to use to update the firmware using Arduino_ESP_OTA library
 *
 * Steps:
 *   1) Create a sketch for your ESP board and verify
 *      that it both compiles and works.
 *   2) In the IDE select: Sketch -> Export compiled Binary.
 *   3) Create an OTA update file utilising the tools 'lzss.py' and 'bin2ota.py' stored in
 *      https://github.com/arduino-libraries/ArduinoIoTCloud/tree/master/extras/tools .
 *      A) ./lzss.py --encode SKETCH.bin SKETCH.lzss
 *      B) ./bin2ota.py ESP SKETCH.lzss SKETCH.ota
 *   4) Upload the OTA file to a network reachable location, e.g. LOLIN_32_Blink.ino.ota
 *      has been uploaded to: http://downloads.arduino.cc/ota/LOLIN_32_Blink.ino.ota 
 *   5) Verify if a custom ca_cert is needed by default DigiCert root CA are used
 *      https://www.digicert.com/kb/digicert-root-certificates.htm
 *   6) Perform an OTA update via steps outlined below.
 */

#include <Arduino_ESP32_OTA.h>

#include "root_ca.h"

string gitapiurl = "https://gitlab.com/api/v4/projects/MarleyPlant%2Fml-woo/releases/permalink/latest/";

static char const OTA_FILE_LOCATION[] = "https://raw.githubusercontent.com/arduino-libraries/Arduino_ESP32_OTA/main/examples/LOLIN_32_Blink/LOLIN_32_Blink.ino.ota";

/******************************************************************************
 * SETUP/LOOP
 ******************************************************************************/

String getOTAString() {
  WiFiClient client;  // or WiFiClientSecure for HTTPS
  HTTPClient http;

  // Send request
  http.useHTTP10(true);
  http.begin(client, gitapiurl);
  http.GET();

  // Parse response
  DynamicJsonDocument doc(2048);
  deserializeJson(doc, http.getStream());

  String downloadURL = doc["assets"]["links"][0]["url"];

  // Read values
  Serial.println(downloadURL);

  // Disconnect
  http.end();
  return downloadURL;
}

void doOTA() {
  Arduino_ESP32_OTA ota;
  Arduino_ESP32_OTA::Error ota_err = Arduino_ESP32_OTA::Error::None;

  /* Configure custom Root CA */
  ota.setCACert(root_ca);

  Serial.println("Initializing OTA storage");
  if ((ota_err = ota.begin()) != Arduino_ESP32_OTA::Error::None) {
    Serial.print("Arduino_ESP_OTA::begin() failed with error code ");
    Serial.println((int)ota_err);
    return;
  }


  Serial.println("Starting download to flash ...");
  int const ota_download = ota.download(OTA_FILE_LOCATION);
  if (ota_download <= 0) {
    Serial.print("Arduino_ESP_OTA::download failed with error code ");
    Serial.println(ota_download);
    return;
  }
  Serial.print(ota_download);
  Serial.println(" bytes stored.");


  Serial.println("Verify update integrity and apply ...");
  if ((ota_err = ota.update()) != Arduino_ESP32_OTA::Error::None) {
    Serial.print("ota.update() failed with error code ");
    Serial.println((int)ota_err);
    return;
  }

  Serial.println("Performing a reset after which the bootloader will start the new firmware.");
#if defined(ARDUINO_NANO_ESP32)
  Serial.println("Hint: Arduino NANO ESP32 will blink Red Green and Blue.");
#else
  Serial.println("Hint: LOLIN32 will blink Blue.");
#endif
  delay(1000); /* Make sure the serial message gets out before the reset. */
  ota.reset();
}

void checkOta(DatabaseConnection* database) {
  if (database->OTAUpdateAvailable()) {
    doOTA();
  }
}

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32-S2!");
}