#include <WiFi.h>
#include <HTTPClient.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <ArduinoJson.h> 

#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64

Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

void setup() {
  Serial.begin(9600);

  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("SSD1306 allocation failed"));
    for(;;);
  }
  delay(2000);
  display.clearDisplay();

  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setCursor(0, 0);
  // Display static text
  display.println("Xin chao");
  display.display(); 

  
  Serial.print("Connecting to WiFi");
  WiFi.begin("Wokwi-GUEST", "", 6);
  while (WiFi.status() != WL_CONNECTED) {
    delay(100);
    Serial.print(".");
  }
  Serial.println(" Connected!");
}

void loop() {
  if (WiFi.status() == WL_CONNECTED) {
    HTTPClient http;
    http.begin("https://api.openweathermap.org/data/2.5/weather?q=Vinh Long&appid=3b1673e537b457895cc3fa1401869fef");
    int httpCode = http.GET();

    if (httpCode > 0) {
      
      String payload = http.getString();
      // Serial.println(httpCode);
      // Serial.println(payload);

      // Phân tích dữ liệu JSON
      const size_t capacity = JSON_OBJECT_SIZE(10) + JSON_ARRAY_SIZE(2) + 300; // Chọn kích thước tùy thuộc vào cấu trúc dữ liệu
      DynamicJsonDocument doc(capacity);

      deserializeJson(doc, payload);

      float temperature = doc["main"]["temp"].as<float>() - 273.15;  // chuyển từ Kelvin sang Celsius
      float humidity = doc["main"]["humidity"].as<float>();

      display.clearDisplay();
      display.setCursor(0, 1);
      display.print("Temperature: ");
      display.print(temperature);
      display.println(" °C");
      
      display.setCursor(0, 10);
      display.print("Humidity: ");
      display.print(humidity);
      display.println(" %");

      display.display();
      
      http.end();
    } else {
      Serial.println("Error on HTTP request");
      http.end();
    }
  }
  delay(10000);
}