#include <WiFi.h>
  #include <Wire.h>
  #include <HTTPClient.h>
  //#include <WiFiClientSecure.h>
  //#include <SPI.h>
  #include <WiFi.h>
  #include <Adafruit_GFX.h>
  #include <Adafruit_SSD1306.h>
  #include <ArduinoJson.h>
  
const char * Hostname = "fortum.se";
String URI = "/api/v1/spot_prices";
const uint16_t port = 443;
float data_spotPrices_SE3_item_value[24];


#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels

#define OLED_RESET     4 // Reset pin # (or -1 if sharing Arduino reset pin)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

void setup() {
display.begin(SSD1306_SWITCHCAPVCC, 0x3c);

  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
   display.clearDisplay();
  display.display();
  display.setTextSize(1); // Draw 1X-scale text
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(0, 0);
  display.println("Hello, ESP32!");
  display.display();      // Show initial text



  
  WiFi.begin("Wokwi-GUEST", "", 6);
  while (WiFi.status() != WL_CONNECTED) {
    delay(100);
    Serial.print(".");
  }
  display.setTextSize(1); // Draw 1X-scale text
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(0, 16);
  display.println("Connetcted!");
  display.display();      // Show initial text
  Serial.println(" Connected!");
}




void loop() {
 // Connect to HTTP server
  WiFiClient client;
  client.setTimeout(10000);
  if (!client.connect(Hostname, port)) {
    Serial.println(F("Connection failed"));
    return;
  }

  Serial.println(F("Connected to server!"));
  // Send HTTP request
  client.println("GET " + URI + " HTTP/1.1");
  client.println("Host: " + (String)Hostname);
  client.println("Connection: close");
  if (client.println() == 0) {
    Serial.println("Failed to send request");
    client.stop();
    return;
  }

  // Check HTTP status
 char status[32] = {0};
 client.readBytesUntil('\r', status, sizeof(status));
  if (strcmp(status, "HTTP/1.1 200 OK") != 0) {
    Serial.print(F("Unexpected response: "));
   Serial.println(status);
    client.stop();
    return;
 }

  // Skip HTTP headers
 char endOfHeaders[] = "\r\n\r\n";
 if (!client.find(endOfHeaders)) {
  Serial.println(F("Invalid response"));
   client.stop();
    return;
  }
  while (client.available() && client.peek() != '{')
  {
    char c = 0;
    client.readBytes(&c, 1);
    Serial.print(c);
    Serial.println("BAD");
  }
  //while (client.available()) {
   //   char c = 0;
   //   client.readBytes(&c, 1);
   //   Serial.print(c);
   // }


// Stream& input;

// Stream& input;

StaticJsonDocument<48> filter;

JsonObject filter_data = filter.createNestedObject("data");
filter_data["resolution"] = "hourly";
filter_data["from"] = "2023-01-04T00:00:00";
filter_data["to"] = "2023-01-04T23:00:00";
filter_data["spotPrices"]["SE3"] = true;
filter["status_code"] = 200;

StaticJsonDocument<2048> doc;

DeserializationError error = deserializeJson(doc, client, DeserializationOption::Filter(filter));

if (error) {
  Serial.print("deserializeJson() failed: ");
  Serial.println(error.c_str());
  return;
}

for (JsonObject data_spotPrices_SE3_item : doc["data"]["spotPrices"]["SE3"].as<JsonArray>()) {

  const char* data_spotPrices_SE3_item_dateTime = data_spotPrices_SE3_item["dateTime"];
  float data_spotPrices_SE3_item_value = data_spotPrices_SE3_item["value"]; // 922.31, 877.35, 778.2, ...

}




  //Serial.println(data_resolution);

  Serial.println(data_spotPrices_SE3_item_value[0]);

  // Disconnect
  client.stop();



  /***************************************************************************
      FOR TIME
  ***************************************************************************/

  //String Time = datetime.substring(11, 16);
  //String Hour = datetime.substring(11, 13);

  //24 hour to 12 hour conversion
  /*int h = Hour.toInt();
  if (h > 12)
    h = h - 12;
  else
    h = h;
  Serial.println(h);
  Hour = (String)h;
  Time = Time.substring(2);
  if (h > 10)
    Time = Hour + Time;
  else
    Time = "0" + Hour + Time;
  Serial.print("time - "); Serial.println(Time);
  */

  /***************************************************************************
    FOR DATE
  ***************************************************************************/

 /* String Date = datetime.substring(0, 10);
  String    Day_str = "";

  if (Day == 0)
    Day_str = "Sv.";
  if (Day == 1)
    Day_str = "Pirmd.";
  if (Day == 2)
    Day_str = "Otrd.";
  if (Day == 3)
    Day_str = "Tr.";
  if (Day == 4)
    Day_str = "Cet.";
  if (Day == 5)
    Day_str = "Piektd.";
  if (Day == 6)
    Day_str = "Sestd.";

  Serial.print("date - "); Serial.println(Date);
  Serial.print("day - "); Serial.println(Day_str);


  display.clearDisplay();

  display.setTextSize(2); // Draw 2X-scale text
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(40, 0);
  display.println(Time);
  display.setCursor(6, 20); 
  display.println(Date);
  //display.print(",");
   display.setCursor(56,40); 
  display.println(Day_str);
  display.display();
*/

  delay(10000);
 
}