Add TwilightCalendar helper class and add a default getter to CacheableTwilightTimeProvider

src/main/java/eu/m724/wtapi/object/TwilightCalendar.java

@@ -0,0 +1,58 @@
+package eu.m724.wtapi.object;
+
+import eu.m724.wtapi.provider.twilight.CacheableTwilightTimeProvider;
+import eu.m724.wtapi.provider.twilight.TwilightTimeCache;
+import eu.m724.wtapi.provider.twilight.impl.approximate.ApproximateTwilightTimeProvider;
+
+import java.time.LocalDate;
+
+// TODO add tests
+public class TwilightCalendar {
+    private final LocalDate date;
+    private final CacheableTwilightTimeProvider<TwilightTimeCache> provider;
+    private final TwilightTimeCache cache;
+
+    public TwilightCalendar(LocalDate date, CacheableTwilightTimeProvider<?> provider) {
+        this.date = date;
+        this.provider = (CacheableTwilightTimeProvider<TwilightTimeCache>) provider;
+        this.cache = provider.initializeCache(date);
+    }
+
+    /**
+     * Gets the {@link Twilight} for the specified {@link Coordinates}
+     *
+     * @param coordinates the coordinates
+     * @return the {@link Twilight}
+     */
+    public Twilight twilight(Coordinates coordinates) {
+        return provider.calculateTwilightTime(cache, coordinates);
+    }
+
+    /**
+     * Gets a {@link TwilightCalendar} with the same provider for the specified date
+     *
+     * @param date the date
+     * @return a {@link TwilightCalendar}
+     */
+    public TwilightCalendar withDate(LocalDate date) {
+        return new TwilightCalendar(date, provider);
+    }
+
+    /**
+     * Gets a {@link TwilightCalendar} for the day after this {@link TwilightCalendar}'s day
+     *
+     * @return a {@link TwilightCalendar}
+     */
+    public TwilightCalendar tomorrow() {
+        return withDate(date.plusDays(1));
+    }
+
+    /**
+     * Gets a {@link TwilightCalendar} for the day before this {@link TwilightCalendar}'s day
+     *
+     * @return a {@link TwilightCalendar}
+     */
+    public TwilightCalendar yesterday() {
+        return withDate(date.minusDays(1));
+    }
+}

src/main/java/eu/m724/wtapi/provider/twilight/CacheableTwilightTimeProvider.java

@@ -2,6 +2,7 @@ package eu.m724.wtapi.provider.twilight;
 
 import eu.m724.wtapi.object.Coordinates;
 import eu.m724.wtapi.object.Twilight;
+import eu.m724.wtapi.object.TwilightCalendar;
 
 import java.time.LocalDate;
 
@@ -37,4 +38,8 @@ public abstract class CacheableTwilightTimeProvider<T extends TwilightTimeCache>
                 coordinates
         );
     }
+
+    public TwilightCalendar getCalendar(LocalDate date) {
+        return new TwilightCalendar(date, this);
+    }
 }