package org.pihole.dnsproxy;

import android.app.Activity;

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

import android.net.VpnService;
import android.net.wifi.WifiManager;

import android.os.Bundle;

import android.util.Log;

import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;

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

public class MainActivity extends Activity {

    private Button buttonStart;
    private Button buttonStop;

    private BroadcastReceiver receiveDNSProxyService = new BroadcastReceiver() {

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

    private BroadcastReceiver receiveNetworkChange = new BroadcastReceiver() {

        /**
         * Set button_start state on receive of network change
         */
        @Override
        public void onReceive(Context context, Intent intent) {
            setStateButtonStartStop();
        }
    };

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

        setContentView(R.layout.main);

        this.buttonStart = (Button) findViewById(R.id.button_start);
        this.buttonStop = (Button) findViewById(R.id.button_stop);
    }

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

        this.setStateButtonStartStop();
        registerReceiver(this.receiveDNSProxyService, new IntentFilter(DNSProxyService.NOTIFICATION_NOTIFY));
        registerReceiver(this.receiveNetworkChange, new IntentFilter(WifiManager.NETWORK_STATE_CHANGED_ACTION));

        WifiListenerService.toggle(this);
        WifiListenerService.OnActivationListener.askLocationIfNeeded(this);
    }

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

        unregisterReceiver(this.receiveDNSProxyService);
        unregisterReceiver(this.receiveNetworkChange);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        MenuInflater menuInflater = getMenuInflater();
        menuInflater.inflate(R.menu.settings, menu);

        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        int itemId = item.getItemId();

        if (itemId == R.id.menu_settings) {
            startActivity(new Intent(this, SettingsActivity.class));

            return true;
        }

        return super.onOptionsItemSelected(item);
    }

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

    /**
     * button_start is clicked
     */
    public void onClickButtonStart(View view) {
        this.prepareVpnService();
    }

    /**
     * button_stop is clicked
     */
    public void onClickButtonStop(View view) {
        this.stopDNSProxyService();
    }

    /**
     * Prepare VpnService properly
     * and ask for confirmation
     */
    private void prepareVpnService() {
        Intent intent = VpnService.prepare(this);

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

    /**
     * Set button_start state
     */
    private void setStateButtonStartStop() {
        if (!DNSProxyService.isRunning()) {
            this.buttonStart.setVisibility(View.VISIBLE);
            this.buttonStop.setVisibility(View.GONE);
        } else {
            this.buttonStart.setVisibility(View.GONE);
            this.buttonStop.setVisibility(View.VISIBLE);
        }
    }

    /**
     * Start DNSProxyService
     */
    private void startDNSProxyService() {
        DNSProxyService.start(this);
    }

    /**
     * Stop DNSProxyService
     */
    private void stopDNSProxyService() {
        DNSProxyService.stop(this);
    }
}