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/*
 * Copyright (C) 2013-2014 Dominik Schürmann <dominik@dominikschuermann.de>
 * Copyright (C) 2013 Bahtiar 'kalkin' Gadimov
 *
 * 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;

import java.util.ArrayList;
import java.util.Date;

import org.sufficientlysecure.keychain.Constants;
import org.sufficientlysecure.keychain.Id;
import org.sufficientlysecure.keychain.R;
import org.sufficientlysecure.keychain.compatibility.ClipboardReflection;
import org.sufficientlysecure.keychain.helper.ExportHelper;
import org.sufficientlysecure.keychain.pgp.PgpKeyHelper;
import org.sufficientlysecure.keychain.provider.KeychainContract.KeyRings;
import org.sufficientlysecure.keychain.provider.KeychainContract.Keys;
import org.sufficientlysecure.keychain.provider.KeychainContract.UserIds;
import org.sufficientlysecure.keychain.provider.ProviderHelper;
import org.sufficientlysecure.keychain.ui.adapter.ViewKeyKeysAdapter;
import org.sufficientlysecure.keychain.ui.adapter.ViewKeyUserIdsAdapter;
import org.sufficientlysecure.keychain.ui.dialog.DeleteKeyDialogFragment;
import org.sufficientlysecure.keychain.ui.dialog.ShareNfcDialogFragment;
import org.sufficientlysecure.keychain.ui.dialog.ShareQrCodeDialogFragment;
import org.sufficientlysecure.keychain.util.Log;

import android.content.Intent;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.support.v4.app.LoaderManager;
import android.support.v4.content.CursorLoader;
import android.support.v4.content.Loader;
import android.text.format.DateFormat;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

import com.actionbarsherlock.app.SherlockFragmentActivity;
import com.actionbarsherlock.view.Menu;
import com.actionbarsherlock.view.MenuItem;
import com.beardedhen.androidbootstrap.BootstrapButton;

public class ViewKeyActivity extends SherlockFragmentActivity implements
        LoaderManager.LoaderCallbacks<Cursor> {

    ExportHelper mExportHelper;

    protected Uri mDataUri;

    private TextView mName;
    private TextView mEmail;
    private TextView mComment;
    private TextView mAlgorithm;
    private TextView mKeyId;
    private TextView mExpiry;
    private TextView mCreation;
    private TextView mFingerprint;
    private BootstrapButton mActionEncrypt;

    private ListView mUserIds;
    private ListView mKeys;

    private static final int LOADER_ID_KEYRING = 0;
    private static final int LOADER_ID_USER_IDS = 1;
    private static final int LOADER_ID_KEYS = 2;
    private ViewKeyUserIdsAdapter mUserIdsAdapter;
    private ViewKeyKeysAdapter mKeysAdapter;

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

        mExportHelper = new ExportHelper(this);

        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
        getSupportActionBar().setIcon(android.R.color.transparent);
        getSupportActionBar().setHomeButtonEnabled(true);

        setContentView(R.layout.view_key_activity);

        mName = (TextView) findViewById(R.id.name);
        mEmail = (TextView) findViewById(R.id.email);
        mComment = (TextView) findViewById(R.id.comment);
        mKeyId = (TextView) findViewById(R.id.key_id);
        mAlgorithm = (TextView) findViewById(R.id.algorithm);
        mCreation = (TextView) findViewById(R.id.creation);
        mExpiry = (TextView) findViewById(R.id.expiry);
        mFingerprint = (TextView) findViewById(R.id.fingerprint);
        mActionEncrypt = (BootstrapButton) findViewById(R.id.action_encrypt);
        mUserIds = (ListView) findViewById(R.id.user_ids);
        mKeys = (ListView) findViewById(R.id.keys);

        loadData(getIntent());
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        super.onCreateOptionsMenu(menu);
        getSupportMenuInflater().inflate(R.menu.key_view, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case android.R.id.home:
                Intent homeIntent = new Intent(this, KeyListPublicActivity.class);
                homeIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                startActivity(homeIntent);
                return true;
            case R.id.menu_key_view_update:
                updateFromKeyserver(mDataUri);
                return true;
            case R.id.menu_key_view_sign:
                signKey(mDataUri);
                return true;
            case R.id.menu_key_view_export_keyserver:
                uploadToKeyserver(mDataUri);
                return true;
            case R.id.menu_key_view_export_file:
                mExportHelper.showExportKeysDialog(mDataUri, Id.type.public_key, Constants.path.APP_DIR
                        + "/pubexport.asc");
                return true;
            case R.id.menu_key_view_share_default_fingerprint:
                shareKey(mDataUri, true);
                return true;
            case R.id.menu_key_view_share_default:
                shareKey(mDataUri, false);
                return true;
            case R.id.menu_key_view_share_qr_code_fingerprint:
                shareKeyQrCode(mDataUri, true);
                return true;
            case R.id.menu_key_view_share_qr_code:
                shareKeyQrCode(mDataUri, false);
                return true;
            case R.id.menu_key_view_share_nfc:
                shareNfc();
                return true;
            case R.id.menu_key_view_share_clipboard:
                copyToClipboard(mDataUri);
                return true;
            case R.id.menu_key_view_delete: {
                // Message is received after key is deleted
                Handler returnHandler = new Handler() {
                    @Override
                    public void handleMessage(Message message) {
                        if (message.what == DeleteKeyDialogFragment.MESSAGE_OKAY) {
                            setResult(RESULT_CANCELED);
                            finish();
                        }
                    }
                };

                mExportHelper.deleteKey(mDataUri, Id.type.public_key, returnHandler);
                return true;
            }
        }
        return super.onOptionsItemSelected(item);
    }

    private void loadData(Intent intent) {
        if (intent.getData().equals(mDataUri)) {
            Log.d(Constants.TAG, "Same URI, no need to load the data again!");
            return;
        }

        mDataUri = intent.getData();
        if (mDataUri == null) {
            Log.e(Constants.TAG, "Intent data missing. Should be Uri of key!");
            finish();
            return;
        }

        Log.i(Constants.TAG, "mDataUri: " + mDataUri.toString());

        mActionEncrypt.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                long keyId = ProviderHelper.getMasterKeyId(ViewKeyActivity.this, mDataUri);

                long[] encryptionKeyIds = new long[]{keyId};
                Intent intent = new Intent(ViewKeyActivity.this, EncryptActivity.class);
                intent.setAction(EncryptActivity.ACTION_ENCRYPT);
                intent.putExtra(EncryptActivity.EXTRA_ENCRYPTION_KEY_IDS, encryptionKeyIds);
                // used instead of startActivity set actionbar based on callingPackage
                startActivityForResult(intent, 0);
            }
        });

        mUserIdsAdapter = new ViewKeyUserIdsAdapter(this, null, 0);

        mUserIds.setAdapter(mUserIdsAdapter);
        // mUserIds.setEmptyView(findViewById(android.R.id.empty));
        // mUserIds.setClickable(true);
        // mUserIds.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        // @Override
        // public void onItemClick(AdapterView<?> arg0, View arg1, int position, long id) {
        // }
        // });

        mKeysAdapter = new ViewKeyKeysAdapter(this, null, 0);

        mKeys.setAdapter(mKeysAdapter);

        // Prepare the loader. Either re-connect with an existing one,
        // or start a new one.
        getSupportLoaderManager().initLoader(LOADER_ID_KEYRING, null, this);
        getSupportLoaderManager().initLoader(LOADER_ID_USER_IDS, null, this);
        getSupportLoaderManager().initLoader(LOADER_ID_KEYS, null, this);
    }

    static final String[] KEYRING_PROJECTION = new String[]{KeyRings._ID, KeyRings.MASTER_KEY_ID,
            UserIds.USER_ID};
    static final int KEYRING_INDEX_ID = 0;
    static final int KEYRING_INDEX_MASTER_KEY_ID = 1;
    static final int KEYRING_INDEX_USER_ID = 2;

    static final String[] USER_IDS_PROJECTION = new String[]{UserIds._ID, UserIds.USER_ID,
            UserIds.RANK,};
    // not the main user id
    static final String USER_IDS_SELECTION = UserIds.RANK + " > 0 ";
    static final String USER_IDS_SORT_ORDER = UserIds.USER_ID + " COLLATE LOCALIZED ASC";

    static final String[] KEYS_PROJECTION = new String[]{Keys._ID, Keys.KEY_ID,
            Keys.IS_MASTER_KEY, Keys.ALGORITHM, Keys.KEY_SIZE, Keys.CAN_CERTIFY, Keys.CAN_SIGN,
            Keys.CAN_ENCRYPT, Keys.CREATION, Keys.EXPIRY, Keys.FINGERPRINT};
    static final String KEYS_SORT_ORDER = Keys.RANK + " ASC";
    static final int KEYS_INDEX_ID = 0;
    static final int KEYS_INDEX_KEY_ID = 1;
    static final int KEYS_INDEX_IS_MASTER_KEY = 2;
    static final int KEYS_INDEX_ALGORITHM = 3;
    static final int KEYS_INDEX_KEY_SIZE = 4;
    static final int KEYS_INDEX_CAN_CERTIFY = 5;
    static final int KEYS_INDEX_CAN_SIGN = 6;
    static final int KEYS_INDEX_CAN_ENCRYPT = 7;
    static final int KEYS_INDEX_CREATION = 8;
    static final int KEYS_INDEX_EXPIRY = 9;
    static final int KEYS_INDEX_FINGERPRINT = 10;

    public Loader<Cursor> onCreateLoader(int id, Bundle args) {
        switch (id) {
            case LOADER_ID_KEYRING: {
                Uri baseUri = mDataUri;

                // Now create and return a CursorLoader that will take care of
                // creating a Cursor for the data being displayed.
                return new CursorLoader(this, baseUri, KEYRING_PROJECTION, null, null, null);
            }
            case LOADER_ID_USER_IDS: {
                Uri baseUri = UserIds.buildUserIdsUri(mDataUri);

                // Now create and return a CursorLoader that will take care of
                // creating a Cursor for the data being displayed.
                return new CursorLoader(this, baseUri, USER_IDS_PROJECTION, USER_IDS_SELECTION, null,
                        USER_IDS_SORT_ORDER);
            }
            case LOADER_ID_KEYS: {
                Uri baseUri = Keys.buildKeysUri(mDataUri);

                // Now create and return a CursorLoader that will take care of
                // creating a Cursor for the data being displayed.
                return new CursorLoader(this, baseUri, KEYS_PROJECTION, null, null, KEYS_SORT_ORDER);
            }

            default:
                return null;
        }
    }

    public void onLoadFinished(Loader<Cursor> loader, Cursor data) {
        // Swap the new cursor in. (The framework will take care of closing the
        // old cursor once we return.)
        switch (loader.getId()) {
            case LOADER_ID_KEYRING:
                if (data.moveToFirst()) {
                    // get name, email, and comment from USER_ID
                    String[] mainUserId = PgpKeyHelper.splitUserId(data
                            .getString(KEYRING_INDEX_USER_ID));
                    if (mainUserId[0] != null) {
                        setTitle(mainUserId[0]);
                        mName.setText(mainUserId[0]);
                    } else {
                        setTitle(R.string.user_id_no_name);
                        mName.setText(R.string.user_id_no_name);
                    }
                    mEmail.setText(mainUserId[1]);
                    mComment.setText(mainUserId[2]);
                }

                break;
            case LOADER_ID_USER_IDS:
                mUserIdsAdapter.swapCursor(data);
                break;
            case LOADER_ID_KEYS:
                // the first key here is our master key
                if (data.moveToFirst()) {
                    // get key id from MASTER_KEY_ID
                    long keyId = data.getLong(KEYS_INDEX_KEY_ID);

                    String keyIdStr = "0x" + PgpKeyHelper.convertKeyIdToHex(keyId);
                    mKeyId.setText(keyIdStr);

                    // get creation date from CREATION
                    if (data.isNull(KEYS_INDEX_CREATION)) {
                        mCreation.setText(R.string.none);
                    } else {
                        Date creationDate = new Date(data.getLong(KEYS_INDEX_CREATION) * 1000);

                        mCreation.setText(DateFormat.getDateFormat(getApplicationContext()).format(
                                creationDate));
                    }

                    // get expiry date from EXPIRY
                    if (data.isNull(KEYS_INDEX_EXPIRY)) {
                        mExpiry.setText(R.string.none);
                    } else {
                        Date expiryDate = new Date(data.getLong(KEYS_INDEX_EXPIRY) * 1000);

                        mExpiry.setText(DateFormat.getDateFormat(getApplicationContext()).format(
                                expiryDate));
                    }

                    String algorithmStr = PgpKeyHelper.getAlgorithmInfo(
                            data.getInt(KEYS_INDEX_ALGORITHM), data.getInt(KEYS_INDEX_KEY_SIZE));
                    mAlgorithm.setText(algorithmStr);

                    byte[] fingerprintBlob = data.getBlob(KEYS_INDEX_FINGERPRINT);
                    if (fingerprintBlob == null) {
                        // FALLBACK for old database entries
                        fingerprintBlob = ProviderHelper.getFingerprint(this, mDataUri);
                    }
                    String fingerprint = PgpKeyHelper.convertFingerprintToHex(fingerprintBlob, true);
                    fingerprint = fingerprint.replace("  ", "\n");

                    mFingerprint.setText(fingerprint);
                }

                mKeysAdapter.swapCursor(data);
                break;

            default:
                break;
        }
    }

    /**
     * This is called when the last Cursor provided to onLoadFinished() above is about to be closed.
     * We need to make sure we are no longer using it.
     */
    public void onLoaderReset(Loader<Cursor> loader) {
        switch (loader.getId()) {
            case LOADER_ID_KEYRING:
                // No resources need to be freed for this ID
                break;
            case LOADER_ID_USER_IDS:
                mUserIdsAdapter.swapCursor(null);
                break;
            case LOADER_ID_KEYS:
                mKeysAdapter.swapCursor(null);
                break;
            default:
                break;
        }
    }

    private void uploadToKeyserver(Uri dataUri) {
        Intent uploadIntent = new Intent(this, UploadKeyActivity.class);
        uploadIntent.setData(dataUri);
        startActivityForResult(uploadIntent, Id.request.export_to_server);
    }

    private void updateFromKeyserver(Uri dataUri) {
        long updateKeyId = ProviderHelper.getMasterKeyId(ViewKeyActivity.this, mDataUri);

        if (updateKeyId == 0) {
            Log.e(Constants.TAG, "this shouldn't happen. KeyId == 0!");
            return;
        }

        Intent queryIntent = new Intent(this, ImportKeysActivity.class);
        queryIntent.setAction(ImportKeysActivity.ACTION_IMPORT_KEY_FROM_KEYSERVER);
        queryIntent.putExtra(ImportKeysActivity.EXTRA_KEY_ID, updateKeyId);

        // TODO: lookup??
        startActivityForResult(queryIntent, Id.request.look_up_key_id);
    }

    private void signKey(Uri dataUri) {
        Intent signIntent = new Intent(this, SignKeyActivity.class);
        signIntent.setData(dataUri);
        startActivity(signIntent);
    }

    private void shareKey(Uri dataUri, boolean fingerprintOnly) {
        String content = null;
        if (fingerprintOnly) {
            byte[] fingerprintBlob = ProviderHelper.getFingerprint(this, dataUri);
            String fingerprint = PgpKeyHelper.convertFingerprintToHex(fingerprintBlob, false);

            content = Constants.FINGERPRINT_SCHEME + ":" + fingerprint;
        } else {
            // get public keyring as ascii armored string
            long masterKeyId = ProviderHelper.getMasterKeyId(this, dataUri);
            ArrayList<String> keyringArmored = ProviderHelper.getKeyRingsAsArmoredString(this,
                    dataUri, new long[]{masterKeyId});

            content = keyringArmored.get(0);

            // Android will fail with android.os.TransactionTooLargeException if key is too big
            // see http://www.lonestarprod.com/?p=34
            if (content.length() >= 86389) {
                Toast.makeText(getApplicationContext(), R.string.key_too_big_for_sharing,
                        Toast.LENGTH_LONG).show();
                return;
            }
        }

        // let user choose application
        Intent sendIntent = new Intent(Intent.ACTION_SEND);
        sendIntent.putExtra(Intent.EXTRA_TEXT, content);
        sendIntent.setType("text/plain");
        startActivity(Intent.createChooser(sendIntent,
                getResources().getText(R.string.action_share_key_with)));
    }

    private void shareKeyQrCode(Uri dataUri, boolean fingerprintOnly) {
        ShareQrCodeDialogFragment dialog = ShareQrCodeDialogFragment.newInstance(dataUri,
                fingerprintOnly);
        dialog.show(getSupportFragmentManager(), "shareQrCodeDialog");
    }

    private void copyToClipboard(Uri dataUri) {
        // get public keyring as ascii armored string
        long masterKeyId = ProviderHelper.getMasterKeyId(this, dataUri);
        ArrayList<String> keyringArmored = ProviderHelper.getKeyRingsAsArmoredString(this, dataUri,
                new long[]{masterKeyId});

        ClipboardReflection.copyToClipboard(this, keyringArmored.get(0));
        Toast.makeText(getApplicationContext(), R.string.key_copied_to_clipboard, Toast.LENGTH_LONG)
                .show();
    }

    private void shareNfc() {
        ShareNfcDialogFragment dialog = ShareNfcDialogFragment.newInstance();
        dialog.show(getSupportFragmentManager(), "shareNfcDialog");
    }

}