/*
 * Copyright (C) 2015 Dominik Schürmann <dominik@dominikschuermann.de>
 * Copyright (C) 2015 Vincent Breitmoser <v.breitmoser@mugenguild.com>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package org.sufficientlysecure.keychain.ui.base;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.os.Message;
import android.support.v4.app.Fragment;

import org.sufficientlysecure.keychain.operations.results.InputPendingResult;
import org.sufficientlysecure.keychain.operations.results.OperationResult;
import org.sufficientlysecure.keychain.service.ServiceProgressHandler;
import org.sufficientlysecure.keychain.service.input.CryptoInputParcel;
import org.sufficientlysecure.keychain.service.input.RequiredInputParcel;
import org.sufficientlysecure.keychain.ui.NfcOperationActivity;
import org.sufficientlysecure.keychain.ui.PassphraseDialogActivity;

/**
 * All fragments executing crypto operations need to extend this class.
 */
public abstract class CryptoOperationFragment extends Fragment {

    public static final int REQUEST_CODE_PASSPHRASE = 0x00008001;
    public static final int REQUEST_CODE_NFC = 0x00008002;

    private void initiateInputActivity(RequiredInputParcel requiredInput) {

        switch (requiredInput.mType) {
            case NFC_KEYTOCARD:
            case NFC_DECRYPT:
            case NFC_SIGN: {
                Intent intent = new Intent(getActivity(), NfcOperationActivity.class);
                intent.putExtra(NfcOperationActivity.EXTRA_REQUIRED_INPUT, requiredInput);
                startActivityForResult(intent, REQUEST_CODE_NFC);
                return;
            }

            case PASSPHRASE:
            case PASSPHRASE_SYMMETRIC: {
                Intent intent = new Intent(getActivity(), PassphraseDialogActivity.class);
                intent.putExtra(PassphraseDialogActivity.EXTRA_REQUIRED_INPUT, requiredInput);
                startActivityForResult(intent, REQUEST_CODE_PASSPHRASE);
                return;
            }
        }

        throw new RuntimeException("Unhandled pending result!");
    }

    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (resultCode == Activity.RESULT_CANCELED) {
            onCryptoOperationCancelled();
            return;
        }

        switch (requestCode) {
            case REQUEST_CODE_PASSPHRASE: {
                if (resultCode == Activity.RESULT_OK && data != null) {
                    CryptoInputParcel cryptoInput =
                            data.getParcelableExtra(PassphraseDialogActivity.RESULT_CRYPTO_INPUT);
                    cryptoOperation(cryptoInput);
                    return;
                }
                break;
            }

            case REQUEST_CODE_NFC: {
                if (resultCode == Activity.RESULT_OK && data != null) {
                    CryptoInputParcel cryptoInput =
                            data.getParcelableExtra(NfcOperationActivity.RESULT_DATA);
                    cryptoOperation(cryptoInput);
                    return;
                }
                break;
            }

            default: {
                super.onActivityResult(requestCode, resultCode, data);
            }
        }
    }

    public boolean handlePendingMessage(Message message) {

        if (message.arg1 == ServiceProgressHandler.MessageStatus.OKAY.ordinal()) {
            Bundle data = message.getData();

            OperationResult result = data.getParcelable(OperationResult.EXTRA_RESULT);
            if (result == null || !(result instanceof InputPendingResult)) {
                return false;
            }

            InputPendingResult pendingResult = (InputPendingResult) result;
            if (pendingResult.isPending()) {
                RequiredInputParcel requiredInput = pendingResult.getRequiredInputParcel();
                initiateInputActivity(requiredInput);
                return true;
            }
        }

        return false;
    }

    protected void cryptoOperation() {
        cryptoOperation(new CryptoInputParcel());
    }

    protected abstract void cryptoOperation(CryptoInputParcel cryptoInput);

    protected void onCryptoOperationCancelled() {
        // Nothing to do here, in most cases
    }

}