/*
 * Copyright © 2013 – 2016 Ricki Hirner (bitfire web engineering).
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the GNU Public License v3.0
 * which accompanies this distribution, and is available at
 * http://www.gnu.org/licenses/gpl.html
 */

package at.bitfire.davdroid.ui.setup;

import android.accounts.Account;
import android.accounts.AccountManager;
import android.app.Activity;
import android.app.Dialog;
import android.app.ProgressDialog;
import android.content.ContentResolver;
import android.content.ContentValues;
import android.content.Context;
import android.content.Intent;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.provider.CalendarContract;
import android.provider.ContactsContract;
import android.support.annotation.NonNull;
import android.support.v4.app.DialogFragment;
import android.support.v4.app.LoaderManager;
import android.support.v4.content.AsyncTaskLoader;
import android.support.v4.content.Loader;

import java.util.logging.Level;

import at.bitfire.davdroid.AccountSettings;
import at.bitfire.davdroid.App;
import at.bitfire.davdroid.Constants;
import at.bitfire.davdroid.DavService;
import at.bitfire.davdroid.InvalidAccountException;
import at.bitfire.davdroid.R;
import at.bitfire.davdroid.journalmanager.Helpers;
import at.bitfire.davdroid.model.CollectionInfo;
import at.bitfire.davdroid.model.ServiceDB;
import at.bitfire.davdroid.resource.LocalTaskList;
import at.bitfire.davdroid.ui.setup.DavResourceFinder.Configuration;
import at.bitfire.ical4android.TaskProvider;
import lombok.Cleanup;

public class SetupEncryptionFragment extends DialogFragment implements LoaderManager.LoaderCallbacks<Configuration> {
    private static final String KEY_CONFIG = "config";

    public static SetupEncryptionFragment newInstance(DavResourceFinder.Configuration config) {
        SetupEncryptionFragment frag = new SetupEncryptionFragment();
        Bundle args = new Bundle(1);
        args.putSerializable(KEY_CONFIG, config);
        frag.setArguments(args);
        return frag;
    }

    @NonNull
    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        ProgressDialog progress = new ProgressDialog(getActivity());
        progress.setTitle(R.string.login_encryption_setup_title);
        progress.setMessage(getString(R.string.login_encryption_setup));
        progress.setIndeterminate(true);
        progress.setCanceledOnTouchOutside(false);
        setCancelable(false);
        return progress;
    }

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

        getLoaderManager().initLoader(0, getArguments(), this);
    }

    @Override
    public Loader<Configuration> onCreateLoader(int id, Bundle args) {
        return new SetupEncryptionLoader(getContext(), (Configuration)args.getSerializable(KEY_CONFIG));
    }

    @Override
    public void onLoadFinished(Loader<Configuration> loader, Configuration config) {
        if (createAccount(config.userName, config)) {
            getActivity().setResult(Activity.RESULT_OK);
            getActivity().finish();
        } else {
            App.log.severe("Account creation failed!");
        }

        dismissAllowingStateLoss();
    }

    @Override
    public void onLoaderReset(Loader<Configuration> loader) {
    }

    static class SetupEncryptionLoader extends AsyncTaskLoader<Configuration> {
        final Context context;
        final Configuration config;

        public SetupEncryptionLoader(Context context, Configuration config) {
            super(context);
            this.context = context;
            this.config = config;
        }

        @Override
        protected void onStartLoading() {
            forceLoad();
        }

        @Override
        public Configuration loadInBackground() {
            config.password = Helpers.deriveKey(config.userName, config.rawPassword);
            return config;
        }
    }


    protected boolean createAccount(String accountName, DavResourceFinder.Configuration config) {
        Account account = new Account(accountName, Constants.ACCOUNT_TYPE);

        // create Android account
        Bundle userData = AccountSettings.initialUserData(config.url, config.userName);
        App.log.log(Level.INFO, "Creating Android account with initial config", new Object[] { account, userData });

        AccountManager accountManager = AccountManager.get(getContext());
        if (!accountManager.addAccountExplicitly(account, config.password, userData))
            return false;

        // add entries for account to service DB
        App.log.log(Level.INFO, "Writing account configuration to database", config);
        @Cleanup ServiceDB.OpenHelper dbHelper = new ServiceDB.OpenHelper(getContext());
        SQLiteDatabase db = dbHelper.getWritableDatabase();
        try {
            AccountSettings settings = new AccountSettings(getContext(), account);

            Intent refreshIntent = new Intent(getActivity(), DavService.class);
            refreshIntent.setAction(DavService.ACTION_REFRESH_COLLECTIONS);

            settings.setAuthToken(config.authtoken);

            if (config.cardDAV != null) {
                // insert CardDAV service
                long id = insertService(db, accountName, ServiceDB.Services.SERVICE_CARDDAV, config.cardDAV);

                // start CardDAV service detection (refresh collections)
                refreshIntent.putExtra(DavService.EXTRA_DAV_SERVICE_ID, id);
                getActivity().startService(refreshIntent);

                // enable contact sync
                ContentResolver.setIsSyncable(account, ContactsContract.AUTHORITY, 1);
                settings.setSyncInterval(ContactsContract.AUTHORITY, Constants.DEFAULT_SYNC_INTERVAL);
            }

            if (config.calDAV != null) {
                // insert CalDAV service
                long id = insertService(db, accountName, ServiceDB.Services.SERVICE_CALDAV, config.calDAV);

                // start CalDAV service detection (refresh collections)
                refreshIntent.putExtra(DavService.EXTRA_DAV_SERVICE_ID, id);
                getActivity().startService(refreshIntent);

                // enable calendar sync
                ContentResolver.setIsSyncable(account, CalendarContract.AUTHORITY, 1);
                settings.setSyncInterval(CalendarContract.AUTHORITY, Constants.DEFAULT_SYNC_INTERVAL);

                // enable task sync if OpenTasks is installed
                // further changes will be handled by PackageChangedReceiver
                if (LocalTaskList.tasksProviderAvailable(getContext())) {
                    ContentResolver.setIsSyncable(account, TaskProvider.ProviderName.OpenTasks.authority, 1);
                    settings.setSyncInterval(TaskProvider.ProviderName.OpenTasks.authority, Constants.DEFAULT_SYNC_INTERVAL);
                }
            }

        } catch(InvalidAccountException e) {
            App.log.log(Level.SEVERE, "Couldn't access account settings", e);
        }

        return true;
    }

    protected long insertService(SQLiteDatabase db, String accountName, String service, DavResourceFinder.Configuration.ServiceInfo info) {
        ContentValues values = new ContentValues();

        // insert service
        values.put(ServiceDB.Services.ACCOUNT_NAME, accountName);
        values.put(ServiceDB.Services.SERVICE, service);
        long serviceID = db.insertWithOnConflict(ServiceDB.Services._TABLE, null, values, SQLiteDatabase.CONFLICT_REPLACE);

        // insert collections
        for (CollectionInfo collection : info.collections.values()) {
            values = collection.toDB();
            values.put(ServiceDB.Collections.SERVICE_ID, serviceID);
            db.insertWithOnConflict(ServiceDB.Collections._TABLE, null, values, SQLiteDatabase.CONFLICT_REPLACE);
        }

        return serviceID;
    }
}