#include <WiFi.h>
#include <WiFiClient.h>
#include <HTTPClient.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16, 2);
void setup() {
  lcd.init();
  lcd.backlight();

  Serial.begin(115200);
  Serial.println("Hello, ESP32!");

  WiFi.begin("Wokwi-GUEST", "");
  Serial.print("Connecting");
  while (WiFi.status() != WL_CONNECTED)
  {
    delay(500);
    Serial.print(".");
  }
  Serial.println();

  Serial.print("Connected, IP address: ");
  Serial.println(WiFi.localIP());
}

void getWeatherInfo (String location) {
  String api_key = "9396f69fee320a0014ac3fa7ab35381d";
  String api = "http://api.openweathermap.org/data/2.5/weather?q=" + location + "&appid=" + api_key;
  String output = "";

  WiFiClient client;
  HTTPClient http;

  if (http.begin(client, api)) {
    int httpCode = http.GET();
    if (httpCode > 0) {
      Serial.print("http code");
      Serial.println(httpCode);

      if (httpCode == HTTP_CODE_OK) {
        output = http.getString();
        Serial.print(output);
        showInfoLCD(lcd, output);

      }

    } else {
      Serial.println(httpCode);
      Serial.println("Failed");
    }
    http.end();
  } else {
    Serial.println("unable to connect");
  }

}

void showInfoLCD(LiquidCrystal_I2C lcd, String input) {
  lcd.clear();
  int lonPosStart1 = input.indexOf("\"pressure\":") + 11;
  int lonPosEnd1 = input.indexOf(",", lonPosStart1);
  int lonPosStart = input.indexOf("\"temp\":") + 7;
  int lonPosEnd = input.indexOf(",", lonPosStart );
  String lon1 = input.substring(lonPosStart1, lonPosEnd1);
  String lon = input.substring(lonPosStart, lonPosEnd);
  int temp = lon.toInt() - 273;
  int pressure = lon1.toInt();
  lcd.setCursor(0,0);
  lcd.print("temp: ");
  lcd.print(temp);
  lcd.setCursor(0,1);
  lcd.print("pressure: ");
  lcd.print(pressure);
}

void loop() {
getWeatherInfo("Hanoi");
  delay(10000); 
}