package com.example.junsang.simsimi;

  import android.annotation.TargetApi;

  import android.os.AsyncTask;

  import android.os.Build;

  import android.support.v7.app.ActionBarActivity;

  import android.os.Bundle;

  import android.util.Log;

  import android.view.Menu;
  import android.view.MenuItem;

  import android.widget.TextView;

  import org.json.JSONArray;
  import org.json.JSONException;

  import org.json.JSONObject;

  
  import java.io.BufferedReader;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.InputStreamReader;
  import java.net.HttpURLConnection;
  import java.net.URL;
  
  
  public class MainActivity extends ActionBarActivity {

      private static final String LOG_TAG = "junsang";
  
      int flag = 0; //url flag

      //

      public String parse_pm(String str) {

          String parse_1 = str.split("<td id=\'cur_pm25\' class=\'tdcur\' style=\'font-weight:bold;font-size:11px;\' align=center>")[1];
          String parse_2 = parse_1.split("</td>")[0];
  
          return parse_2;
      }

      private static final String URL = "http://jp3.aqicn.org/aqicn/services/geolocate/?autolocate&n=1";
      String nearestPos = "";
      String results;
      TextView pm_tv;
  
      @TargetApi(Build.VERSION_CODES.M)

      @Override
      protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.activity_main);

  
          pm_tv = (TextView) findViewById(R.id.pm_tv);
  
          new DownloadPageTask().execute(URL);

      }
  
      @Override
      public boolean onCreateOptionsMenu(Menu menu) {

          getMenuInflater().inflate(R.menu.menu_main, menu);
          return true;
      }
  
      @Override
      public boolean onOptionsItemSelected(MenuItem item) {

          int id = item.getItemId();

          if (id == R.id.action_settings) {
              return true;
          }
  
          return super.onOptionsItemSelected(item);
      }

       private class DownloadPageTask extends AsyncTask<String, Void, String> {

          @Override
          protected String doInBackground(String... urls) {
              try {
                  return getHtmlFromHttp(urls[0]);
              } catch (IOException e) {
                  return "Unable to retrieve web page.";
              }
          }
  
          @Override
          protected void onPostExecute(String result) {
              results = result;

              String nearestUrl = "";

              JSONArray jArr = null;
  
              if(flag==0) {
  
                  try {
                      jArr = new JSONArray(result);
  
                      for (int i = 0; i < jArr.length(); i++) {
                          JSONObject curl = jArr.getJSONObject(i);
                          nearestPos = curl.getString("name");
                          nearestUrl = curl.getString("curl");
                      }
  
                  } catch (JSONException e) {
                      e.printStackTrace();
                  }
                  System.out.println(nearestPos);
                  System.out.println(nearestUrl);
                  flag++;
                  new DownloadPageTask().execute(nearestUrl);

              }

              else {
              results = result;

              String pm25 ="";

              pm25 = parse_pm(result);

                  System.out.println(nearestPos);
                  pm_tv.setText("지금 " + nearestPos + "의 초미세먼지 농도는 " + pm25 + "㎍/㎥야~");

                  flag =0;
              }

          }
      }
  
      private String getHtmlFromHttp(String myUrl) throws IOException {
          InputStream is = null;
          String str = "";
  
          try {
              URL url = new URL(myUrl);
              HttpURLConnection conn = (HttpURLConnection) url.openConnection();
              conn.setReadTimeout(10000);
              conn.setConnectTimeout(10000);
              conn.setRequestMethod("GET");
              conn.setDoInput(true);
  
              conn.connect();
              int resCode = conn.getResponseCode();
  
              if (resCode == HttpURLConnection.HTTP_OK) {
                  StringBuffer sb = new StringBuffer();
  
                  is = conn.getInputStream();
                  BufferedReader br = new BufferedReader(new InputStreamReader(is));
                  String line;
                  while ((line = br.readLine()) != null) {
                      sb.append(line);
                  }
                  str = sb.toString();

              } else {
                  conn.disconnect();
              }
          } finally {
              if (is != null) {
                  is.close();
              }
          }
  
          return str;
      }
  }