= Full Calendar

:Notice: Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file distributed with this work for additional information regarding copyright ownership. The ASF licenses this file to you 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.

The Full Calendar module integrates with the xref:vw:ROOT:about.adoc[Wicket Viewer], rendering any collection of domain objects that expose a date to be rendered in a calendar view (using the link:https://fullcalendar.io/[fullcalendar] javascript library).

This can be accessed from the menu item for tables whose element type meets the appropriate criteria (see xref:#usage[usage], below).

image::screenshot-menu.png[width=300px]

This will then bring up the fullcalendar view:

image::screenshot-view.png[width=800px]

From here the end-user can click on the object in the calendar to open each up.

== Setup

=== Dependency Management

In your application's top level `pom.xml`, add a dependency for this module's own bill of materials (BOM):

[source,xml,subs="attributes+"]
.pom.xml
----
<dependencyManagement>
    <dependencies>
        <dependency>
            <groupId>org.apache.causeway.extensions</groupId>
            <artifactId>causeway-extensions-fullcalendar</artifactId>
            <scope>import</scope>
            <type>pom</type>
            <version>{page-causewayprevv2}</version>
        </dependency>
    </dependencies>
</dependencyManagement>
----

=== Dependencies / Imports

In those modules where there are domain objects to be represented on the calendar, add a dependency/import to the applib module:

* add this dependency:
+
[source,xml,subs="attributes+"]
.pom.xml
----
<dependencies>
    <dependency>
        <groupId>org.apache.causeway.extensions</groupId>
        <artifactId>causeway-extensions-fullcalendar-applib</artifactId>
    </dependency>
</dependencies>
----

* and `@Import` this module:
+
[source,java]
.MyModule.java
----
@Configuration
@Import({
    CausewayModuleExtFullcalendarApplib.class,
    // ...
})
public class MyModule { ... }
----

In addition, in the webapp module of your application, add the following dependency:

[source,xml]
.pom.xml
----
<dependency>
    <groupId>org.apache.causeway.extensions</groupId>
    <artifactId>causeway-extensions-exceldownload-wicket-ui</artifactId>
</dependency>
----

And in your application's xref:userguide::modules.adoc#appmanifest[App Manifest], import the extension's implementation module:

[source,java]
.AppManifest.java
----
@Configuration
@Import({
        CausewayModuleExtFullcalendarWicketUi.class,
        ...
})
public class AppManifest {
}
----

[#usage]
== Usage

In order that a domain object can appear in the full calendar view, it must implement one of two interfaces:

* `org.apache.causeway.extensions.fullcalendar.applib.CalendarEventable`
+
By implementing this interface, the domain object exposes two values: the name of a calendar, and a date (as well as the object's title, and optionally a tooltip).
+
This is appropriate when there the domain object has just one date property of interest, for example an `Appointment` domain object.

* `org.apache.causeway.extensions.fullcalendar.applib.Calendarable`
+
This interface is very similar, but allows the domain object to expose multiple calendars and multiple corresponding dates.
+
For example, a `HotelStay` domain object could expose its check-in and check-out dates as two separate dates of interest.

For example,

[source,java]
.HotelStay.java
----
// ...
public class HotelStay implements Calendarable {

    @Property
    @Getter
    private java.time.LocalDate checkIn;

    @Property
    @Getter
    private String checkInNotes;

    @Property
    @Getter
    private java.time.LocalDate checkOut;

    @Property
    @Getter
    private String checkOutNotes;

    @Override
    public Set<String> getCalendarNames() {
        return _Sets.of("Check-in", "Check-out");
    }

    @Override
    public Map<String, CalendarEventable> getCalendarEvents() {
        String myTitle = titleService.titleOf(this);
        return _Maps.unmodifiable(
                "Check-in",  new MyCalendarEventable("Check-in",  getCheckIn(), myTitle, getCheckInNotes()),
                "Check-out", new MyCalendarEventable("Check-out",  getCheckOut(), myTitle, getCheckOutNotes())
                );
    }

    // ...

    @Inject @Transient TitleService titleService;
}
----

where `MyCalendarEventable` is a helper class:

[source,java]
.HotelStay.MyCalendarEventable.java
----
public class HotelStay ... {

    // ...
    @RequiredArgsConstructor
    class MyCalendarEventable implements CalendarEventable {

        @Getter
        private final String calendarName;
        private final localDate localDate;
        private final String title;
        private final String tooltip;

        @Override
        public CalendarEvent toCalendarEvent() {
            return localDate != null
                    ? toCalendarEvent(localDate)
                    : null;
        }

        private CalendarEvent toCalendarEvent(LocalDate localDate) {
            ZoneRules zoneRules = clockService.getClock().nowAsOffsetDateTime().toZonedDateTime().getZone().getRules();
            long epochMillis = localDate.toEpochSecond(LocalTime.MIDNIGHT, zoneRules.getOffset(localDate.atStartOfDay())) * 1000L;
            return new CalendarEvent(epochMillis, calendarName,
                title, tooltip);
        }
    }

    @Inject @Transient ClockService clockService;
}
----
