package com.joshuawise.dumload;

import java.io.File;

import android.content.SharedPreferences;
import android.os.AsyncTask;
import android.os.Bundle;
import android.preference.PreferenceActivity;
import android.preference.PreferenceManager;
import android.view.Menu;
import android.view.MenuItem;
import android.view.Window;
import android.widget.Toast;

import com.jcraft.jsch.JSch;
import com.jcraft.jsch.KeyPair;

public class Preferences extends PreferenceActivity {

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

		@Override
		protected String doInBackground(Void... params) {
			String ret = null;
			String homedir = getFilesDir().getAbsolutePath();
			String filename = homedir + "/id_dsa_generated";
			File file = new File(filename);
			if (file.exists()) {
				return getString(R.string.msgKeyExists);
			} else {
				JSch jsch = new JSch();
				int type = KeyPair.DSA;
				try {
					KeyPair kpair = KeyPair.genKeyPair(jsch, type);
					// TODO: query for a passphrase
					kpair.setPassphrase("");
					kpair.writePrivateKey(filename);
					kpair.writePublicKey(filename + ".pub", "generated by dumload");
					ret = "Fingerprint: " + kpair.getFingerPrint();
					kpair.dispose();
				} catch (Exception e) {
					System.out.println(e);
				}
			}
			return ret;
		}

		@Override
		protected void onPostExecute(String result) {
			setProgressBarIndeterminateVisibility(false);
			Toast.makeText(getApplicationContext(), result, Toast.LENGTH_LONG).show();
			super.onPostExecute(result);
		}
		
	}
	
	@Override
	public void onCreate(Bundle savedInstanceState) {
		requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
		super.onCreate(savedInstanceState);
		// Load the preferences from an XML resource
		addPreferencesFromResource(R.xml.preferences);
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		super.onCreateOptionsMenu(menu);

		menu.add(Menu.NONE, R.id.actionCreateSshKey, Menu.NONE,
				getString(R.string.menuGenSshKey));
		menu.add(Menu.NONE, R.id.actionRemoveSshKey, Menu.NONE,
				getString(R.string.menuDelSshKey));
		return true;
	}

	public boolean onOptionsItemSelected(MenuItem item) {
		switch (item.getItemId()) {
		case R.id.actionCreateSshKey:
			generateDSAKeyPair();
			break;
		case R.id.actionRemoveSshKey:
			String homedir = getFilesDir().getAbsolutePath();
			String filename = homedir + "/id_dsa_generated";
			File file = new File(filename);
			if (file.exists()) {
				file.delete();
				Toast.makeText(this,
						"Deleted",
						Toast.LENGTH_LONG).show();
			} else {
				Toast.makeText(this, getString(R.string.msgNoGenKeyFound), Toast.LENGTH_SHORT).show();
			}
		}
		return false;
	}

	private void generateDSAKeyPair() {
		setProgressBarIndeterminateVisibility(true);
		KeygenTask t = new KeygenTask();
		t.execute();
	}
}