/*
 * Copyright 2016 Anton Tananaev (anton.tananaev@gmail.com)
 * Copyright 2016 Andrey Kunitsyn (abyss@fox5.ru)
 *
 * 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.traccar.reports;

import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Comparator;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.SortedSet;
import java.util.TreeSet;

import javax.json.Json;
import javax.json.JsonArrayBuilder;

import org.jxls.area.Area;
import org.jxls.builder.xls.XlsCommentAreaBuilder;
import org.jxls.common.CellRef;
import org.jxls.formula.StandardFormulaProcessor;
import org.jxls.transform.Transformer;
import org.jxls.transform.poi.PoiTransformer;
import org.jxls.util.TransformerFactory;
import org.traccar.Context;
import org.traccar.model.Device;
import org.traccar.model.Event;
import org.traccar.model.Geofence;
import org.traccar.model.Group;
import org.traccar.reports.model.DeviceReport;
import org.traccar.web.JsonConverter;

public final class Events {

    private Events() {
    }

    public static String getJson(long userId, Collection<Long> deviceIds, Collection<Long> groupIds,
            Collection<String> types, Date from, Date to) throws SQLException {
        JsonArrayBuilder json = Json.createArrayBuilder();
        for (long deviceId: ReportUtils.getDeviceList(deviceIds, groupIds)) {
            Context.getPermissionsManager().checkDevice(userId, deviceId);
            for (String type : types) {
                for (Event event : Context.getDataManager().getEvents(deviceId, type, from, to)) {
                    json.add(JsonConverter.objectToJson(event));
                }
            }
        }
        return json.build().toString();
    }

    public static void getExcel(OutputStream outputStream,
            long userId, Collection<Long> deviceIds, Collection<Long> groupIds,
            Collection<String> types, Date from, Date to) throws SQLException, IOException {
        ArrayList<DeviceReport> devicesEvents = new ArrayList<>();
        ArrayList<String> sheetNames = new ArrayList<>();
        HashMap<Long, String> geofenceNames = new HashMap<>();
        for (long deviceId: ReportUtils.getDeviceList(deviceIds, groupIds)) {
            Context.getPermissionsManager().checkDevice(userId, deviceId);
            SortedSet<Event> eventReports = new TreeSet<Event>(new Comparator<Event>() {
                @Override
                public int compare(Event e1, Event e2) {
                    return e1.getServerTime().compareTo(e2.getServerTime());
                }
            });
            for (String type : types) {
                Collection<Event> events = Context.getDataManager().getEvents(deviceId, type, from, to);
                for (Event event : events) {
                    long geofenceId = event.getGeofenceId();
                    if (geofenceId != 0) {
                        Geofence geofence = Context.getGeofenceManager().getGeofence(geofenceId);
                        if (geofence != null) {
                            geofenceNames.put(geofenceId, geofence.getName());
                        } else {
                            geofenceNames.put(geofenceId, Long.toString(geofenceId));
                        }
                    }
                    eventReports.add(event);
                }
            }
            if (!eventReports.isEmpty()) {
                DeviceReport deviceEvents = new DeviceReport();
                Device device = Context.getIdentityManager().getDeviceById(deviceId);
                deviceEvents.setDeviceName(device.getName());
                sheetNames.add(deviceEvents.getDeviceName());
                if (device.getGroupId() != 0) {
                    Group group = Context.getDeviceManager().getGroupById(device.getGroupId());
                    if (group != null) {
                        deviceEvents.setGroupName(group.getName());
                    }
                }
                deviceEvents.setObjects(eventReports);
                devicesEvents.add(deviceEvents);
            }
        }
        String templatePath = Context.getConfig().getString("report.events.template.excel",
                "templates/export/events.xlsx");
        try (InputStream inputStream = new FileInputStream(templatePath)) {
            org.jxls.common.Context jxlsContext = PoiTransformer.createInitialContext();
            jxlsContext.putVar("devices", devicesEvents);
            jxlsContext.putVar("sheetNames", sheetNames);
            jxlsContext.putVar("geofenceNames", geofenceNames);
            jxlsContext.putVar("from", from);
            jxlsContext.putVar("to", to);
            jxlsContext.putVar("bracketsRegex", "[\\{\\}\"]");
            Transformer transformer = TransformerFactory.createTransformer(inputStream, outputStream);
            List<Area> xlsAreas = new XlsCommentAreaBuilder(transformer).build();
            for (Area xlsArea : xlsAreas) {
                xlsArea.applyAt(new CellRef(xlsArea.getStartCellRef().getCellName()), jxlsContext);
                xlsArea.setFormulaProcessor(new StandardFormulaProcessor());
                xlsArea.processFormulas();
            }
            transformer.deleteSheet(xlsAreas.get(0).getStartCellRef().getSheetName());
            transformer.write();
        }
    }
}