import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonParser;
import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

public class FundHoldings {
    public static void main(String[] args) throws Exception {
        // Read VOO's file (one GET, no key), naming your own project
        var request = HttpRequest.newBuilder(
                URI.create("https://tickerinside.com/api/v1/fund/voo.json"))
            .header("User-Agent", "MyProject/1.0 (+https://example.com)")
            .build();
        var response = HttpClient.newHttpClient()
            .send(request, HttpResponse.BodyHandlers.ofString());
        if (response.statusCode() != 200) {
            throw new RuntimeException("HTTP " + response.statusCode());
        }
        JsonObject fund = JsonParser.parseString(response.body())
            .getAsJsonObject();

        // The date of the issuer's file the weights come from
        System.out.println("VOO holdings_as_of "
            + fund.get("holdings_as_of").getAsString());

        // holdings maps each ticker to its weight in percent: largest first
        List<Map.Entry<String, JsonElement>> rows =
            new ArrayList<>(fund.getAsJsonObject("holdings").entrySet());
        rows.sort((a, b) -> Double.compare(
            b.getValue().getAsDouble(), a.getValue().getAsDouble()));
        System.out.println(rows.size() + " holdings, largest first");
        for (var row : rows) {
            System.out.println(row.getKey() + " " + row.getValue());
        }

        // The line to print under any figure you quote
        System.out.println(fund.get("cite_as").getAsString());
    }
}