Hashtag following

closes #684, closes #233

mastodon/src/main/java/org/joinmastodon/android/api/requests/tags/GetTag.java

@@ -0,0 +1,10 @@
+package org.joinmastodon.android.api.requests.tags;
+
+import org.joinmastodon.android.api.MastodonAPIRequest;
+import org.joinmastodon.android.model.Hashtag;
+
+public class GetTag extends MastodonAPIRequest<Hashtag>{
+	public GetTag(String tag){
+		super(HttpMethod.GET, "/tags/"+tag, Hashtag.class);
+	}
+}

mastodon/src/main/java/org/joinmastodon/android/api/requests/tags/SetTagFollowed.java

@@ -0,0 +1,11 @@
+package org.joinmastodon.android.api.requests.tags;
+
+import org.joinmastodon.android.api.MastodonAPIRequest;
+import org.joinmastodon.android.model.Hashtag;
+
+public class SetTagFollowed extends MastodonAPIRequest<Hashtag>{
+	public SetTagFollowed(String tag, boolean followed){
+		super(HttpMethod.POST, "/tags/"+tag+(followed ? "/follow" : "/unfollow"), Hashtag.class);
+		setRequestBody(new Object());
+	}
+}

mastodon/src/main/java/org/joinmastodon/android/fragments/FeaturedHashtagsListFragment.java

@@ -15,6 +15,7 @@
 
 import java.util.Collections;
 import java.util.List;
+import java.util.Objects;
 import java.util.stream.Collectors;
 
 import androidx.recyclerview.widget.RecyclerView;
@@ -44,7 +45,7 @@ protected void addAccountToKnown(Hashtag s){
 
 	@Override
 	public void onItemClick(String id){
-		UiUtils.openHashtagTimeline(getActivity(), accountID, id);
+		UiUtils.openHashtagTimeline(getActivity(), accountID, Objects.requireNonNull(findItemOfType(id, HashtagStatusDisplayItem.class)).tag);
 	}
 
 	@Override

mastodon/src/main/java/org/joinmastodon/android/fragments/HashtagTimelineFragment.java

@@ -1,24 +1,52 @@
 package org.joinmastodon.android.fragments;
 
 import android.app.Activity;
+import android.content.res.TypedArray;
 import android.os.Bundle;
+import android.text.SpannableStringBuilder;
+import android.view.Menu;
+import android.view.MenuInflater;
+import android.view.MenuItem;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.ImageButton;
+import android.widget.ProgressBar;
+import android.widget.TextView;
 
 import org.joinmastodon.android.R;
+import org.joinmastodon.android.api.MastodonErrorResponse;
+import org.joinmastodon.android.api.requests.tags.GetTag;
+import org.joinmastodon.android.api.requests.tags.SetTagFollowed;
 import org.joinmastodon.android.api.requests.timelines.GetHashtagTimeline;
+import org.joinmastodon.android.model.Hashtag;
 import org.joinmastodon.android.model.Status;
+import org.joinmastodon.android.ui.text.SpacerSpan;
+import org.joinmastodon.android.ui.views.ProgressBarButton;
+import org.parceler.Parcels;
 
 import java.util.List;
 
+import androidx.annotation.NonNull;
+import androidx.recyclerview.widget.RecyclerView;
 import me.grishka.appkit.Nav;
+import me.grishka.appkit.api.Callback;
+import me.grishka.appkit.api.ErrorResponse;
 import me.grishka.appkit.api.SimpleCallback;
+import me.grishka.appkit.utils.CubicBezierInterpolator;
+import me.grishka.appkit.utils.MergeRecyclerAdapter;
+import me.grishka.appkit.utils.SingleViewRecyclerAdapter;
 import me.grishka.appkit.utils.V;
 
 public class HashtagTimelineFragment extends StatusListFragment{
-	private String hashtag;
+	private Hashtag hashtag;
+	private String hashtagName;
 	private ImageButton fab;
+	private TextView headerTitle, headerSubtitle;
+	private ProgressBarButton followButton;
+	private ProgressBar followProgress;
+	private MenuItem followMenuItem;
+	private boolean followRequestRunning;
+	private boolean toolbarContentVisible;
 
 	public HashtagTimelineFragment(){
 		setListLayoutId(R.layout.recycler_fragment_with_fab);
@@ -27,13 +55,19 @@ public HashtagTimelineFragment(){
 	@Override
 	public void onAttach(Activity activity){
 		super.onAttach(activity);
-		hashtag=getArguments().getString("hashtag");
-		setTitle('#'+hashtag);
+		if(getArguments().containsKey("hashtag")){
+			hashtag=Parcels.unwrap(getArguments().getParcelable("hashtag"));
+			hashtagName=hashtag.name;
+		}else{
+			hashtagName=getArguments().getString("hashtagName");
+		}
+		setTitle('#'+hashtagName);
+		setHasOptionsMenu(true);
 	}
 
 	@Override
 	protected void doLoadData(int offset, int count){
-		currentRequest=new GetHashtagTimeline(hashtag, offset==0 ? null : getMaxID(), null, count)
+		currentRequest=new GetHashtagTimeline(hashtagName, offset==0 ? null : getMaxID(), null, count)
 				.setCallback(new SimpleCallback<>(this){
 					@Override
 					public void onSuccess(List<Status> result){
@@ -50,22 +84,190 @@ protected void onShown(){
 			loadData();
 	}
 
+	@Override
+	public void loadData(){
+		reloadTag();
+		super.loadData();
+	}
+
 	@Override
 	public void onViewCreated(View view, Bundle savedInstanceState){
 		super.onViewCreated(view, savedInstanceState);
 		fab=view.findViewById(R.id.fab);
 		fab.setOnClickListener(this::onFabClick);
+
+		list.addOnScrollListener(new RecyclerView.OnScrollListener(){
+			@Override
+			public void onScrolled(@NonNull RecyclerView recyclerView, int dx, int dy){
+				View topChild=recyclerView.getChildAt(0);
+				int firstChildPos=recyclerView.getChildAdapterPosition(topChild);
+				float newAlpha=firstChildPos>0 ? 1f : Math.min(1f, -topChild.getTop()/(float)headerTitle.getHeight());
+				toolbarTitleView.setAlpha(newAlpha);
+				boolean newToolbarVisibility=newAlpha>0.5f;
+				if(newToolbarVisibility!=toolbarContentVisible){
+					toolbarContentVisible=newToolbarVisibility;
+					if(followMenuItem!=null)
+						followMenuItem.setVisible(toolbarContentVisible);
+				}
+			}
+		});
 	}
 
 	private void onFabClick(View v){
 		Bundle args=new Bundle();
 		args.putString("account", accountID);
-		args.putString("prefilledText", '#'+hashtag+' ');
+		args.putString("prefilledText", '#'+hashtagName+' ');
 		Nav.go(getActivity(), ComposeFragment.class, args);
 	}
 
 	@Override
 	protected void onSetFabBottomInset(int inset){
 		((ViewGroup.MarginLayoutParams) fab.getLayoutParams()).bottomMargin=V.dp(16)+inset;
 	}
+
+	@Override
+	protected RecyclerView.Adapter getAdapter(){
+		View header=getActivity().getLayoutInflater().inflate(R.layout.header_hashtag_timeline, list, false);
+		headerTitle=header.findViewById(R.id.title);
+		headerSubtitle=header.findViewById(R.id.subtitle);
+		followButton=header.findViewById(R.id.profile_action_btn);
+		followProgress=header.findViewById(R.id.action_progress);
+
+		headerTitle.setText("#"+hashtagName);
+		followButton.setVisibility(View.GONE);
+		followButton.setOnClickListener(v->{
+			if(hashtag==null)
+				return;
+			setFollowed(!hashtag.following);
+		});
+		updateHeader();
+
+		MergeRecyclerAdapter mergeAdapter=new MergeRecyclerAdapter();
+		mergeAdapter.addAdapter(new SingleViewRecyclerAdapter(header));
+		mergeAdapter.addAdapter(super.getAdapter());
+		return mergeAdapter;
+	}
+
+	@Override
+	protected int getMainAdapterOffset(){
+		return 1;
+	}
+
+	@Override
+	public void onCreateOptionsMenu(Menu menu, MenuInflater inflater){
+		followMenuItem=menu.add(getString(hashtag!=null && hashtag.following ? R.string.unfollow_user : R.string.follow_user, "#"+hashtagName));
+		followMenuItem.setVisible(toolbarContentVisible);
+	}
+
+	@Override
+	public boolean onOptionsItemSelected(MenuItem item){
+		if(hashtag!=null){
+			setFollowed(!hashtag.following);
+		}
+		return true;
+	}
+
+	@Override
+	protected void onUpdateToolbar(){
+		super.onUpdateToolbar();
+		toolbarTitleView.setAlpha(toolbarContentVisible ? 1f : 0f);
+		if(followMenuItem!=null)
+			followMenuItem.setVisible(toolbarContentVisible);
+	}
+
+	private void updateHeader(){
+		if(hashtag==null)
+			return;
+
+		if(hashtag.history!=null && !hashtag.history.isEmpty()){
+			int weekPosts=hashtag.history.stream().mapToInt(h->h.uses).sum();
+			int todayPosts=hashtag.history.get(0).uses;
+			int numAccounts=hashtag.history.stream().mapToInt(h->h.accounts).sum();
+			int hSpace=V.dp(8);
+			SpannableStringBuilder ssb=new SpannableStringBuilder();
+			ssb.append(getResources().getQuantityString(R.plurals.x_posts, weekPosts, weekPosts));
+			ssb.append(" ", new SpacerSpan(hSpace, 0), 0);
+			ssb.append('·');
+			ssb.append(" ", new SpacerSpan(hSpace, 0), 0);
+			ssb.append(getResources().getQuantityString(R.plurals.x_participants, numAccounts, numAccounts));
+			ssb.append(" ", new SpacerSpan(hSpace, 0), 0);
+			ssb.append('·');
+			ssb.append(" ", new SpacerSpan(hSpace, 0), 0);
+			ssb.append(getResources().getQuantityString(R.plurals.x_posts_today, todayPosts, todayPosts));
+			headerSubtitle.setText(ssb);
+		}
+
+		int styleRes;
+		followButton.setVisibility(View.VISIBLE);
+		if(hashtag.following){
+			followButton.setText(R.string.button_following);
+			styleRes=R.style.Widget_Mastodon_M3_Button_Tonal;
+		}else{
+			followButton.setText(R.string.button_follow);
+			styleRes=R.style.Widget_Mastodon_M3_Button_Filled;
+		}
+		TypedArray ta=followButton.getContext().obtainStyledAttributes(styleRes, new int[]{android.R.attr.background});
+		followButton.setBackground(ta.getDrawable(0));
+		ta.recycle();
+		ta=followButton.getContext().obtainStyledAttributes(styleRes, new int[]{android.R.attr.textColor});
+		followButton.setTextColor(ta.getColorStateList(0));
+		followProgress.setIndeterminateTintList(ta.getColorStateList(0));
+		ta.recycle();
+
+		followButton.setTextVisible(true);
+		followProgress.setVisibility(View.GONE);
+		if(followMenuItem!=null){
+			followMenuItem.setTitle(getString(hashtag.following ? R.string.unfollow_user : R.string.follow_user, "#"+hashtagName));
+		}
+	}
+
+	private void reloadTag(){
+		new GetTag(hashtagName)
+				.setCallback(new Callback<>(){
+					@Override
+					public void onSuccess(Hashtag result){
+						hashtag=result;
+						updateHeader();
+					}
+
+					@Override
+					public void onError(ErrorResponse error){
+
+					}
+				})
+				.exec(accountID);
+	}
+
+	private void setFollowed(boolean followed){
+		if(followRequestRunning)
+			return;
+		followButton.setTextVisible(false);
+		followProgress.setVisibility(View.VISIBLE);
+		followRequestRunning=true;
+		new SetTagFollowed(hashtagName, followed)
+				.setCallback(new Callback<>(){
+					@Override
+					public void onSuccess(Hashtag result){
+						if(getActivity()==null)
+							return;
+						hashtag=result;
+						updateHeader();
+						followRequestRunning=false;
+					}
+
+					@Override
+					public void onError(ErrorResponse error){
+						if(getActivity()==null)
+							return;
+						if(error instanceof MastodonErrorResponse er && "Duplicate record".equals(er.error)){
+							hashtag.following=true;
+						}else{
+							error.showToast(getActivity());
+						}
+						updateHeader();
+						followRequestRunning=false;
+					}
+				})
+				.exec(accountID);
+	}
 }

mastodon/src/main/java/org/joinmastodon/android/fragments/ProfileFeaturedFragment.java

@@ -93,7 +93,7 @@ public void onItemClick(String id){
 				args.putParcelable("profileAccount", Parcels.wrap(res.account));
 				Nav.go(getActivity(), ProfileFragment.class, args);
 			}
-			case HASHTAG -> UiUtils.openHashtagTimeline(getActivity(), accountID, res.hashtag.name);
+			case HASHTAG -> UiUtils.openHashtagTimeline(getActivity(), accountID, res.hashtag);
 			case STATUS -> {
 				Status status=res.status.getContentStatus();
 				Bundle args=new Bundle();

mastodon/src/main/java/org/joinmastodon/android/fragments/discover/SearchFragment.java

@@ -94,7 +94,7 @@ public void onItemClick(String id){
 				args.putParcelable("profileAccount", Parcels.wrap(res.account));
 				Nav.go(getActivity(), ProfileFragment.class, args);
 			}
-			case HASHTAG -> UiUtils.openHashtagTimeline(getActivity(), accountID, res.hashtag.name);
+			case HASHTAG -> UiUtils.openHashtagTimeline(getActivity(), accountID, res.hashtag);
 			case STATUS -> {
 				Status status=res.status.getContentStatus();
 				Bundle args=new Bundle();

mastodon/src/main/java/org/joinmastodon/android/fragments/discover/SearchQueryFragment.java

@@ -377,7 +377,7 @@ public void onAnimationEnd(Animator animation){
 	}
 
 	private void openHashtag(SearchResult res){
-		UiUtils.openHashtagTimeline(getActivity(), accountID, res.hashtag.name);
+		UiUtils.openHashtagTimeline(getActivity(), accountID, res.hashtag);
 		AccountSessionManager.getInstance().getAccount(accountID).getCacheController().putRecentSearch(res);
 	}
 

mastodon/src/main/java/org/joinmastodon/android/fragments/discover/TrendingHashtagsFragment.java

@@ -105,7 +105,7 @@ public void onBind(Hashtag item){
 
 		@Override
 		public void onClick(){
-			UiUtils.openHashtagTimeline(getActivity(), accountID, item.name);
+			UiUtils.openHashtagTimeline(getActivity(), accountID, item);
 		}
 	}
 }

mastodon/src/main/java/org/joinmastodon/android/fragments/onboarding/SignupFragment.java

@@ -271,7 +271,7 @@ public void head(Node node, int depth){
 						@Override
 						public void tail(Node node, int depth){
 							if(node instanceof Element){
-								ssb.setSpan(new LinkSpan("", SignupFragment.this::onGoBackLinkClick, LinkSpan.Type.CUSTOM, null), spanStart, ssb.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
+								ssb.setSpan(new LinkSpan("", SignupFragment.this::onGoBackLinkClick, LinkSpan.Type.CUSTOM, null, null), spanStart, ssb.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
 								ssb.setSpan(new TypefaceSpan("sans-serif-medium"), spanStart, ssb.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
 							}
 						}

mastodon/src/main/java/org/joinmastodon/android/model/Hashtag.java

@@ -13,6 +13,7 @@ public class Hashtag extends BaseModel implements DisplayItemsParent{
 	public String url;
 	public List<History> history;
 	public int statusesCount;
+	public boolean following;
 
 	@Override
 	public String toString(){
@@ -21,6 +22,7 @@ public String toString(){
 				", url='"+url+'\''+
 				", history="+history+
 				", statusesCount="+statusesCount+
+				", following="+following+
 				'}';
 	}