/*
 * FreeOTP
 *
 * Authors: Nathaniel McCallum <npmccallum@redhat.com>
 *
 * Copyright (C) 2013  Nathaniel McCallum, Red Hat
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.fedorahosted.freeotp;

import java.util.Locale;

import android.app.AlertDialog;
import android.content.DialogInterface;
import android.net.Uri;
import android.text.TextWatcher;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.EditText;
import android.widget.RadioButton;
import android.widget.Spinner;
import android.widget.TextView;

public class ManualDialogFragment extends BaseAlertDialogFragment implements OnItemSelectedListener {
	public static final String FRAGMENT_TAG = "fragment_camera";
	private static final String DEFAULT_INTERVAL = "30";
	private static final String DEFAULT_COUNTER = "0";

	private final int SHA1_OFFSET = 1;
	private final int TOTP_OFFSET = 0;
	private EditText mIssuer;
	private EditText mLabel;
	private EditText mSecret;
	private EditText mInterval;
	private Spinner mAlgorithm;
	private Spinner mType;

	public ManualDialogFragment() {
		super(R.string.add_token, R.layout.manual, android.R.string.cancel, 0, R.string.add);
	}

	@Override
	protected void onViewInflated(View view) {
		mIssuer = (EditText) view.findViewById(R.id.issuer);
		mLabel = (EditText) view.findViewById(R.id.label);
		mSecret = (EditText) view.findViewById(R.id.secret);
		mInterval = (EditText) view.findViewById(R.id.interval);
		mAlgorithm = (Spinner) view.findViewById(R.id.algorithm);
		mType = (Spinner) view.findViewById(R.id.type);

		// Select the default algorithm
		mAlgorithm.setSelection(SHA1_OFFSET);

		// Setup the Interval / Counter toggle
		mType.setOnItemSelectedListener(this);
	}

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

		AlertDialog ad = (AlertDialog) getDialog();

		// Disable the Add button
		ad.getButton(AlertDialog.BUTTON_POSITIVE).setEnabled(false);

		// Set constraints on when the Add button is enabled
		TextWatcher tw = new ManualTextWatcher(ad);
		mIssuer.addTextChangedListener(tw);
		mLabel.addTextChangedListener(tw);
		mSecret.addTextChangedListener(new ManualSecretTextWatcher(ad));
		mInterval.addTextChangedListener(tw);
	}

	@Override
	public void onClick(DialogInterface dialog, int which) {
		if (which != AlertDialog.BUTTON_POSITIVE)
			return;

		// Get the fields
		String issuer = Uri.encode(mIssuer.getText().toString());
		String label = Uri.encode(mLabel.getText().toString());
		String secret = Uri.encode(mSecret.getText().toString());
		String type = mType.getSelectedItemId() == TOTP_OFFSET ? "totp" : "hotp";
		String algorithm = mAlgorithm.getSelectedItem().toString().toLowerCase(Locale.US);
		int interval = Integer.parseInt(mInterval.getText().toString());
		int digits = ((RadioButton) getDialog().findViewById(R.id.digits6)).isChecked() ? 6 : 8;

		// Create the URI
		String uri = String.format(Locale.US, "otpauth://%s/%s:%s?secret=%s&algorithm=%s&digits=%d",
                                   type, issuer, label, secret, algorithm, digits);
		if (type.equals("totp"))
			uri = uri.concat(String.format("&period=%d", interval));
		else
			uri = uri.concat(String.format("&counter=%d", interval));

		// Add the token
		if (uri != null)
			((MainActivity) getActivity()).tokenURIReceived(uri);
	}

	@Override
	public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
		TextView tv = (TextView) getDialog().findViewById(R.id.interval_label);
		if (position == 0) {
			tv.setText(R.string.interval);
			mInterval.setText(DEFAULT_INTERVAL);
		} else {
			tv.setText(R.string.counter);
			mInterval.setText(DEFAULT_COUNTER);
		}
	}

	@Override
	public void onNothingSelected(AdapterView<?> parent) {
	}
}