package ch.hevs.isi.db;


import ch.hevs.isi.core.DataPoint;
import ch.hevs.isi.core.DataPointListener;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Properties;


public class DatabaseConnector implements DataPointListener {
    Properties properties = new Properties();
    String default_token = System.getenv("SECRET_TOKEN");
    String default_url;
    String default_org;
    String default_bucket;
    String fullURL;
    URL myURL;
    HttpURLConnection con;


    private static DatabaseConnector  mySelf = null;

    private DatabaseConnector (){
        try (InputStream input = new FileInputStream("src/config.properties")) {
            properties.load(input);
        } catch (Exception e) {
            e.printStackTrace();
        }
        default_url = properties.getProperty("URL");
        default_org = properties.getProperty("ORG");
        default_bucket = properties.getProperty("BUCKET");
    }

    public static DatabaseConnector  getMySelf(){
        if (mySelf == null){
            mySelf = new DatabaseConnector();
        }
        return mySelf;
    }
    public void initialize(String url){
        String org = default_org;
        String bucket = default_bucket;

        fullURL = url + "/api/v2/write?org=" + org + "&bucket=" + bucket;
        System.out.println(fullURL);
        try{
            myURL = new URL(fullURL);
        } catch (MalformedURLException e) {
            throw new RuntimeException(e);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }


    }

    private void pushToDatabase(DataPoint dp){
        String data = "measurement " + dp.toString();
        try {
            HttpURLConnection con = (HttpURLConnection) myURL.openConnection();
            con.setRequestMethod("POST");
            con.setRequestProperty("Authorization", "Token " + default_token);
            con.setRequestProperty("Content-Type", "application/json");
            con.setDoOutput(true);
            OutputStreamWriter writer = new OutputStreamWriter(con.getOutputStream());
            writer.write(data);
            writer.flush();
            int respondCode = con.getResponseCode();
            System.out.println(dp.toString() + " -> Database. Code: " + respondCode);
            con.disconnect();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    @Override
    public void onNewValue(DataPoint dp) {
        pushToDatabase(dp);
    }
}