/*
 * Copyright 2016 - 2022 Anton Tananaev (anton@traccar.org)
 * Copyright 2016 Andrey Kunitsyn (andrey@traccar.org)
 *
 * 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.model;

import com.fasterxml.jackson.annotation.JsonIgnore;
import net.fortuna.ical4j.data.CalendarBuilder;
import net.fortuna.ical4j.data.ParserException;
import net.fortuna.ical4j.filter.Filter;
import net.fortuna.ical4j.filter.predicate.PeriodRule;
import net.fortuna.ical4j.model.DateTime;
import net.fortuna.ical4j.model.Period;
import net.fortuna.ical4j.model.component.CalendarComponent;
import net.fortuna.ical4j.model.component.VEvent;
import org.traccar.storage.QueryIgnore;
import org.traccar.storage.StorageName;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.time.Duration;
import java.util.Collection;
import java.util.Date;
import java.util.List;
import java.util.stream.Collectors;

@StorageName("tc_calendars")
public class Calendar extends ExtendedModel {

    private String name;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    private byte[] data;

    public byte[] getData() {
        return data;
    }

    public void setData(byte[] data) throws IOException, ParserException {
        CalendarBuilder builder = new CalendarBuilder();
        calendar = builder.build(new ByteArrayInputStream(data));
        this.data = data;
    }

    private net.fortuna.ical4j.model.Calendar calendar;

    @QueryIgnore
    @JsonIgnore
    public net.fortuna.ical4j.model.Calendar getCalendar() {
        return calendar;
    }

    private Collection<VEvent> findEvents(Date date) {
        if (calendar != null) {
            var filter = new Filter<VEvent>(new PeriodRule<>(new Period(new DateTime(date), Duration.ZERO)));
            return filter.filter(calendar.getComponents(CalendarComponent.VEVENT));
        } else {
            return List.of();
        }
    }

    public Collection<Period> findPeriods(Date date) {
        var calendarDate = new net.fortuna.ical4j.model.Date(date);
        return findEvents(date).stream()
                .flatMap((event) -> event.getConsumedTime(calendarDate, calendarDate).stream())
                .collect(Collectors.toSet());
    }

    public boolean checkMoment(Date date) {
        return !findEvents(date).isEmpty();
    }

}