package org.pihole.dnsproxy;

import android.app.Activity;
import android.app.AlertDialog;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;

import android.net.VpnService;

import android.os.Bundle;

import android.util.Log;

import android.view.TextureView;
import android.view.View;

import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends Activity {

    private Button buttonStart;
    private Intent dnsProxyService;

    private BroadcastReceiver receiver = new BroadcastReceiver() {

        /**
         * Set button_start state on receive from DNSProxyService
         */
        @Override
        public void onReceive(Context context, Intent intent) {
            setStateButtonStart();
        }
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);

        this.buttonStart = (Button) findViewById(R.id.button_start);
        this.dnsProxyService = new Intent(this, DNSProxyService.class);
    }

    @Override
    public void onResume() {
        super.onResume();

        this.setStateButtonStart();
        registerReceiver(this.receiver, new IntentFilter(DNSProxyService.NOTIFICATION));
    }

    @Override
    public void onPause() {
        super.onPause();

        unregisterReceiver(receiver);
    }

    /**
     * is called by "startActivityForResult" internally
     */
    @Override
    public void onActivityResult(int request, int result, Intent data) {
        if (result == RESULT_OK) {
          this.start();
        }
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {}

    /**
     * button_start is clicked
     */
    public void onClickButtonStart(View view) {
        if (!DNSProxyService.isRunning()) { //start
            Intent intent = VpnService.prepare(this);

            if (intent != null) {
                startActivityForResult(intent, 0);
            } else {
                this.onActivityResult(0, RESULT_OK, null);
            }
        }
        else { // stop
            this.stop();
        }
    }

    /**
     * Set button_start text
     */
    public void setStateButtonStart() {
        if (!DNSProxyService.isRunning()) {
            this.buttonStart.setText(getString(R.string.button_start__start));
        } else {
            this.buttonStart.setText(getString(R.string.button_start__stop));
        }
    }

    /**
     * Start DNSProxyService
     */
    public void start() {
        startService(this.dnsProxyService.setAction(DNSProxyService.ACTION_START));

        Toast
            .makeText(
                this,
                getString(R.string.service_starting),
                Toast.LENGTH_SHORT
            )
            .show();
    }

    /**
     * Stop DNSProxyService
     */
    public void stop() {
        startService(this.dnsProxyService.setAction(DNSProxyService.ACTION_STOP));

        Toast
            .makeText(
                this,
                getString(R.string.service_stopping),
                Toast.LENGTH_SHORT
            )
            .show();
    }
}