#include <Adafruit_GFX.h>
#include <Adafruit_ILI9341.h>
#include <EspSimpleWifiHandler.h>
#include <HTTPClient.h>
#include <ArduinoJson.h>

// ILI9341 TFT Pins
#define TFT_CS 10
#define TFT_DC 53
#define TFT_RST -1  // Reset not used

// Wi-Fi credentials
const char *ssid = "YOUR_SSID";
const char *password = "YOUR_PASSWORD";

// Crypto API URL
const char *cryptoApiUrl = "https://api.coingecko.com/api/v3/simple/price?ids=bitcoin,ethereum,litecoin&vs_currencies=usd";

// TFT Setup
Adafruit_ILI9341 tft = Adafruit_ILI9341(TFT_CS, TFT_DC, TFT_RST);

// Function declarations
void displayCryptoPrices(float btcPrice, float ethPrice, float ltcPrice);
void fetchCryptoPrices();
void setupWiFi();

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

  // Initialize TFT
  tft.begin();
  tft.setRotation(3);
  tft.fillScreen(ILI9341_BLACK);

  // Setup Wi-Fi
  setupWiFi();

  // Fetch and display cryptocurrency prices
  fetchCryptoPrices();
}

void loop() {
  // Update prices every 30 seconds
  delay(30000);
  fetchCryptoPrices();
}

// Function to setup Wi-Fi
void setupWiFi() {
  Serial.print("Connecting to WiFi");
  WiFi.begin(ssid, password);

  int attempts = 0;
  while (WiFi.status() != WL_CONNECTED && attempts < 20) {
    delay(1000);
    Serial.print(".");
    attempts++;
  }

  if (WiFi.status() == WL_CONNECTED) {
    Serial.println("\nConnected to WiFi");
  } else {
    Serial.println("\nFailed to connect to WiFi");
  }
}

// Function to fetch cryptocurrency prices from CoinGecko API
void fetchCryptoPrices() {
  if (WiFi.status() == WL_CONNECTED) {
    HTTPClient http;
    http.begin(cryptoApiUrl);

    int httpCode = http.GET();
    if (httpCode > 0) {
      String response = http.getString();
      
      Serial.println("API Response: " + response); // Debug output

      DynamicJsonDocument doc(1024);
      DeserializationError error = deserializeJson(doc, response);

      if (!error) {
        float btcPrice = doc["bitcoin"]["usd"];
        float ethPrice = doc["ethereum"]["usd"];
        float ltcPrice = doc["litecoin"]["usd"];

        displayCryptoPrices(btcPrice, ethPrice, ltcPrice);
      } else {
        Serial.println("JSON Parsing Error");
      }
    } else {
      Serial.println("Failed to connect to API");
    }

    http.end();
  } else {
    Serial.println("WiFi not connected");
  }
}

// Function to display cryptocurrency prices on the TFT display
void displayCryptoPrices(float btcPrice, float ethPrice, float ltcPrice) {
  tft.fillScreen(ILI9341_BLACK);
  tft.setTextColor(ILI9341_WHITE);
  tft.setTextSize(2);
  tft.setCursor(10, 10);
  tft.println("Crypto Prices");

  tft.setTextSize(1);
  tft.setCursor(10, 60);
  tft.print("Bitcoin (BTC): $");
  tft.println(btcPrice);

  tft.setCursor(10, 100);
  tft.print("Ethereum (ETH): $");
  tft.println(ethPrice);

  tft.setCursor(10, 140);
  tft.print("Litecoin (LTC): $");
  tft.println(ltcPrice);
}