Drafts and scheduled posts (LucasGGamerM#217)

closes LucasGGamerM#100
closes LucasGGamerM#59

* enable saving as draft (scheduled)
* add scheduled posts list
* fix NoSuchMethodError
* editable drafts/scheduled posts
* ui for drafts
* use instants between 9999-01-01 and 9999-12-31
* use save and draft strings
* map scheduled status params to status
* implement scheduling posts
* improve save/discard draft dialog
* persist scheduled date in state
* add unsent posts button to toolbar
* clean up imports

mastodon/src/main/java/org/joinmastodon/android/api/requests/statuses/CreateStatus.java

@@ -1,6 +1,7 @@
 package org.joinmastodon.android.api.requests.statuses;
 
 import org.joinmastodon.android.api.MastodonAPIRequest;
+import org.joinmastodon.android.model.ScheduledStatus;
 import org.joinmastodon.android.model.Status;
 import org.joinmastodon.android.model.StatusPrivacy;
 
@@ -9,12 +10,29 @@
 import java.util.List;
 
 public class CreateStatus extends MastodonAPIRequest<Status>{
+	public static final Instant DRAFTS_AFTER_INSTANT = Instant.ofEpochMilli(253370764799999L) /* end of 9998 */;
+	private static final float draftFactor = 31536000000f /* one year */ / 253370764799999f /* end of 9998 */;
+
+	public static Instant getDraftInstant() {
+		// returns an instant between 9999-01-01 00:00:00 and 9999-12-31 23:59:59
+		// yes, this is a weird implementation for something that hardly matters
+		return DRAFTS_AFTER_INSTANT.plusMillis(1 + (long) (System.currentTimeMillis() * draftFactor));
+	}
+
 	public CreateStatus(CreateStatus.Request req, String uuid){
 		super(HttpMethod.POST, "/statuses", Status.class);
 		setRequestBody(req);
 		addHeader("Idempotency-Key", uuid);
 	}
 
+	public static class Scheduled extends MastodonAPIRequest<ScheduledStatus>{
+		public Scheduled(CreateStatus.Request req, String uuid){
+			super(HttpMethod.POST, "/statuses", ScheduledStatus.class);
+			setRequestBody(req);
+			addHeader("Idempotency-Key", uuid);
+		}
+	}
+
 	public static class Request{
 		public String status;
 		public List<String> mediaIds;

mastodon/src/main/java/org/joinmastodon/android/api/requests/statuses/DeleteStatus.java

@@ -7,4 +7,10 @@ public class DeleteStatus extends MastodonAPIRequest<Status>{
 	public DeleteStatus(String id){
 		super(HttpMethod.DELETE, "/statuses/"+id, Status.class);
 	}
+
+	public static class Scheduled extends MastodonAPIRequest<Object> {
+		public Scheduled(String id) {
+			super(HttpMethod.DELETE, "/scheduled_statuses/"+id, Object.class);
+		}
+	}
 }

mastodon/src/main/java/org/joinmastodon/android/api/requests/statuses/GetScheduledStatuses.java

@@ -0,0 +1,16 @@
+package org.joinmastodon.android.api.requests.statuses;
+
+import com.google.gson.reflect.TypeToken;
+
+import org.joinmastodon.android.api.requests.HeaderPaginationRequest;
+import org.joinmastodon.android.model.ScheduledStatus;
+
+public class GetScheduledStatuses extends HeaderPaginationRequest<ScheduledStatus>{
+	public GetScheduledStatuses(String maxID, int limit){
+		super(HttpMethod.GET, "/scheduled_statuses", new TypeToken<>(){});
+		if(maxID!=null)
+			addQueryParameter("max_id", maxID);
+		if(limit>0)
+			addQueryParameter("limit", limit+"");
+	}
+}

mastodon/src/main/java/org/joinmastodon/android/events/ScheduledStatusCreatedEvent.java

@@ -0,0 +1,13 @@
+package org.joinmastodon.android.events;
+
+import org.joinmastodon.android.model.ScheduledStatus;
+
+public class ScheduledStatusCreatedEvent {
+	public final ScheduledStatus scheduledStatus;
+	public final String accountID;
+
+	public ScheduledStatusCreatedEvent(ScheduledStatus scheduledStatus, String accountID){
+		this.scheduledStatus = scheduledStatus;
+		this.accountID=accountID;
+	}
+}

mastodon/src/main/java/org/joinmastodon/android/events/ScheduledStatusDeletedEvent.java

@@ -0,0 +1,13 @@
+package org.joinmastodon.android.events;
+
+import org.joinmastodon.android.model.ScheduledStatus;
+
+public class ScheduledStatusDeletedEvent{
+	public final String id;
+	public final String accountID;
+
+	public ScheduledStatusDeletedEvent(String id, String accountID){
+		this.id=id;
+		this.accountID=accountID;
+	}
+}