package net.apptools.network;

import android.os.Handler;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;

public class MainActivity extends AppCompatActivity {
    EditText editText;
    Button button;
    TextView textView;
    Handler handler = new Handler();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        editText = (EditText) findViewById(R.id.editText);
        button = (Button) findViewById(R.id.button);
        textView = (TextView) findViewById(R.id.textView);

        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                RequestThread thread = new RequestThread();
                thread.start();
            }
        });
    }

    class RequestThread extends Thread {
        public void run() {
            //입력 상자에 입력된 URL을 가져옴
            String urlStr = editText.getText().toString();
            try { //네트워킹은 예외가 발생할 수 있어서 Excption 에러가 자주발생함.
                //http 요청으로 아주 간단히 URL 객체를 만들수 있음.
                URL url = new URL(urlStr);
                HttpURLConnection connection = (HttpURLConnection) url.openConnection();
                connection.setDoInput(true);
                connection.setDoOutput(true);
                connection.setConnectTimeout(10000); //10초 동안 응답 없으면 끊음.
                int resCode = connection.getResponseCode(); //http 응답 코드를 받기
                if(resCode == 200) { //서버 접속이 정상인 경우 서버에서 200 코드를 보내줌.
                    //connection에 inputStream으로 받게 되는데 한 줄씩 받을려면 BufferReader
                    //로 받으면 바로 변환이 안되므로 InputStreamReader로 한번더 감싸줘야함.
                    BufferedReader bufferedReader = new BufferedReader(
                            new InputStreamReader(connection.getInputStream(), "UTF-8"));
                    //결과물을 담을수 있는 StringBuilder
                    StringBuilder stringBuilder = new StringBuilder();
                    String line = null;
                    while(true) {
                        //readLine() 한줄씩 읽을 수 있음.
                        line = bufferedReader.readLine();
                        if(line == null) break;
                        stringBuilder.append(line + "\n");
                    }
                    bufferedReader.close();
                    connection.disconnect();
                    String result = stringBuilder.toString();
                    println(result); //화면의 TextView에 결과 출력 (핸들러이용)
                } else {
                    //resCode 200이 아닌 경우 -> 서버 에러
                    Toast.makeText(getApplicationContext(), "접속오류 : " + resCode, Toast.LENGTH_LONG).show();
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }

    //쓰레드에서 UI에 접근 할 수 없으니 핸들러를 만들어 준다.
    private void println(final String data) {
        handler.post(new Runnable() {
            @Override
            public void run() {
                textView.setText("");
                textView.append(data + "\n");
            }
        });
    }
}