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

const char* ssid = "Wokwi-GUEST";
const char* password = "";

const String url = "http://api.coindesk.com/v1/bpi/currentprice/BTC.json";
const String historyURL = "http://api.coindesk.com/v1/bpi/historical/close.json";
const String cryptoCode = "BTC";

HTTPClient http;
String lastPrice;

// 'icons8-bitcoin-24', 24x24px
const unsigned char bitcoinIcon [] PROGMEM = {
  0x00, 0x7e, 0x00, 0x03, 0xff, 0xc0, 0x07, 0x81, 0xe0, 0x0e, 0x00, 0x70, 0x18, 0x28, 0x18, 0x30,
  0x28, 0x0c, 0x70, 0xfc, 0x0e, 0x60, 0xfe, 0x06, 0x60, 0xc7, 0x06, 0xc0, 0xc3, 0x03, 0xc0, 0xc7,
  0x03, 0xc0, 0xfe, 0x03, 0xc0, 0xff, 0x03, 0xc0, 0xc3, 0x83, 0xc0, 0xc1, 0x83, 0x60, 0xc3, 0x86,
  0x60, 0xff, 0x06, 0x70, 0xfe, 0x0e, 0x30, 0x28, 0x0c, 0x18, 0x28, 0x18, 0x0e, 0x00, 0x70, 0x07,
  0x81, 0xe0, 0x03, 0xff, 0xc0, 0x00, 0x7e, 0x00
};

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

  Serial.print("CONNECTED to SSID: ");
  Serial.println(ssid);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED)
  {
    delay(100);
    Serial.print(".");
  }

  Serial.println("Connected");
  //display.println(ssid);
  //Serial.println("");
  //display.println("WiFi connected");
  Serial.print("IP address: ");
  Serial.println(WiFi.localIP());

  Serial.println("Hello, krurueng!");//เปลียนข้อมูลให้เป็นชื่อตัวเอง

  delay(5000);
}

void loop() {
  // โค๊ดให้โปรแกรมทำซ้ำ
  clientcon();
  delay(10000); //

  //Display Header
  //display.clearDisplay();
  //display.setTextSize(1);
  //printCenter("BTC/USD", 0, 0);

  //display.clearDisplay();
  //display.drawBitmap((128 / 2) - (24 / 2), 0, bitcoinIcon, 24, 24, WHITE);


  //Display BTC Price
  //String BTCUSDPrice = "123456789";
  //display.setTextSize(1);
  //printCenter("$" + BTCUSDPrice, 0, 32);

  //display.display();
}

void clientcon() {
  if (WiFi.status() == WL_CONNECTED) {
    Serial.println("Getting current data...");

    http.begin(url);
    int httpCode = http.GET();
    Serial.print("HTTP Code: ");
    Serial.println(httpCode);
    if (httpCode > 0) {
      StaticJsonDocument<768> doc;
      DeserializationError error = deserializeJson(doc, http.getString());

      if (error) {
        Serial.print(F("deserializeJson failed: "));
        Serial.println(error.f_str());
        delay(2500);
        return;
      }

      Serial.print("HTTP Status Code: ");
      Serial.println(httpCode);

      String BTCUSDPrice = doc["bpi"]["USD"]["rate_float"].as<String>();
      if (BTCUSDPrice == lastPrice) {
        Serial.print("Price hasn't changed (Current/Last): ");
        Serial.print(BTCUSDPrice);
        Serial.print(" : ");
        Serial.println(lastPrice);
        delay(1250);
        return;
      } else {
        lastPrice = BTCUSDPrice;
      }
      String lastUpdated = doc["time"]["updated"].as<String>();
      http.end();

      Serial.println("Getting history...");
      StaticJsonDocument<1536> historyDoc;
      http.begin(historyURL);
      int historyHttpCode = http.GET();
      DeserializationError historyError = deserializeJson(historyDoc, http.getString());

      if (historyError) {
        Serial.print(F("deserializeJson(History) failed: "));
        Serial.println(historyError.f_str());
        delay(2500);
        return;
      }

      //Display Header
      //display.clearDisplay();
      //display.setTextSize(1);
      //printCenter("BTC/USD", 0, 0);
      //display.clearDisplay();
      //display.drawBitmap((128 / 2) - (24 / 2), 0, bitcoinIcon, 24, 24, WHITE);
      //display.display();

      //Display BTC Price
      //display.setTextSize(1);
      //printCenter("$" + BTCUSDPrice, 0, 32);

      //Display 24hr. Percent Change
      double yesterdayPrice = historyDoc["bpi"]["2021-03-20"].as<double>();
      bool isUp = BTCUSDPrice.toDouble() > yesterdayPrice;
      double percentChange;
      String dayChangeString = "24hr. Change: ";
      if (isUp) {
        percentChange = ((BTCUSDPrice.toDouble() - yesterdayPrice) / yesterdayPrice) * 100;
      } else {
        percentChange = ((yesterdayPrice - BTCUSDPrice.toDouble()) / yesterdayPrice) * 100;
        dayChangeString = dayChangeString + "-";
      }
      //display.setTextSize(1);
      //dayChangeString = dayChangeString + percentChange + "%";
      //printCenter(dayChangeString, 0, 55);

      //display.display();
      http.end();
    }
    delay(1250);
  }
}