/**
 * JBoss, Home of Professional Open Source
 * Copyright Red Hat, Inc., and individual contributors.
 *
 * 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.jboss.aerogear.unifiedpush.service.impl;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import javax.inject.Inject;

import org.jboss.aerogear.unifiedpush.api.Installation;
import org.jboss.aerogear.unifiedpush.api.PushApplication;
import org.jboss.aerogear.unifiedpush.api.PushMessageInformation;
import org.jboss.aerogear.unifiedpush.api.Variant;
import org.jboss.aerogear.unifiedpush.dao.InstallationDao;
import org.jboss.aerogear.unifiedpush.dao.PageResult;
import org.jboss.aerogear.unifiedpush.dao.PushApplicationDao;
import org.jboss.aerogear.unifiedpush.dao.PushMessageInformationDao;
import org.jboss.aerogear.unifiedpush.dao.VariantDao;
import org.jboss.aerogear.unifiedpush.dto.Count;
import org.jboss.aerogear.unifiedpush.service.PushSearchService;
import org.jboss.aerogear.unifiedpush.service.dashboard.Application;
import org.jboss.aerogear.unifiedpush.service.dashboard.ApplicationVariant;
import org.jboss.aerogear.unifiedpush.service.dashboard.DashboardData;

/**
 * Implementation of the <code>PushSearchService</code> internally used for 'admin' role,
 * to query all, instead of being tied to a specific user/login name.
 */
public class PushSearchServiceImpl implements PushSearchService {

    @Inject
    private PushApplicationDao pushApplicationDao;

    @Inject
    private VariantDao variantDao;

    @Inject
    private InstallationDao installationDao;

    @Inject
    private PushMessageInformationDao pushMessageInformationDao;

    @Override
    public PageResult<PushApplication, Count> findAllPushApplicationsForDeveloper(Integer page, Integer pageSize) {
        return pushApplicationDao.findAll(page, pageSize);
    }

    @Override
    public PushApplication findByPushApplicationIDForDeveloper(String pushApplicationID) {
        return pushApplicationDao.findAllByPushApplicationID(pushApplicationID);
    }

    @Override
    public boolean existsVariantIDForDeveloper(String variantID) {
        return variantDao.existsVariantIDForAdmin(variantID);
    }

    @Override
    public PageResult<Installation, Count> findAllInstallationsByVariantForDeveloper(String variantID, Integer page, Integer pageSize, String search) {
        return installationDao.findInstallationsByVariant(variantID, page, pageSize, search);
    }


    /**
     * Receives the dashboard data for the given user
     */
    @Override
    public DashboardData loadDashboardData() {

        long totalApps = totalApplicationNumber();
        long totalDevices = totalDeviceNumber();
        long totalMessages = totalMessages();


        final DashboardData data = new DashboardData();
        data.setApplications(totalApps);
        data.setDevices(totalDevices);
        data.setMessages(totalMessages);

        return data;
    }

    /**
     * Loads all the Variant objects where we did notice some failures on sending
     * for the given user
     */
    @Override
    public List<ApplicationVariant> getVariantsWithWarnings() {
        final List<String> warningIDs = pushMessageInformationDao.findVariantIDsWithWarnings();
        if (warningIDs.isEmpty()) {
            return Collections.emptyList();
        }

        return wrapApplicationVariant(pushApplicationDao.findByVariantIds(warningIDs));
    }

    /**
     * Loads all the Variant objects with the most received messages
     */
    @Override
    public List<Application> getLatestActivity(int maxResults) {
        return wrapApplication(pushMessageInformationDao.findLatestActivity(maxResults));
    }

    private long totalMessages() {
        return pushMessageInformationDao.getNumberOfPushMessagesForApplications();
    }

    private long totalDeviceNumber() {
        return installationDao.getTotalNumberOfDevices();
    }

    private long totalApplicationNumber() {
        return pushApplicationDao.getNumberOfPushApplicationsForDeveloper();
    }

    private List<ApplicationVariant> wrapApplicationVariant(List<PushApplication> applications) {
        final List<ApplicationVariant> applicationVariants = new ArrayList<ApplicationVariant>(applications.size());
        for (PushApplication application : applications) {
            for (Variant variant : application.getVariants()) {
                final ApplicationVariant applicationVariant = new ApplicationVariant(application, variant);
                applicationVariants.add(applicationVariant);
            }
        }
        return applicationVariants;
    }

    private List<Application> wrapApplication(List<PushMessageInformation> pushMessageInformations) {
        final List<Application> applications = new ArrayList<Application>(pushMessageInformations.size());
        for (PushMessageInformation pushMessageInformation : pushMessageInformations) {

            final PushApplication pushApplication = pushApplicationDao.findByPushApplicationID(pushMessageInformation.getPushApplicationId());

            // make sure this is really there, and has not been deleted
            if (pushApplication != null) {
                final String applicationName = pushApplication.getName();
                final Application application = new Application(applicationName, pushMessageInformation.getPushApplicationId(), pushMessageInformation.getTotalReceivers(), pushMessageInformation.getSubmitDate());
                applications.add(application);
            }
        }
        return applications;
    }
}
