FairEmail/app/src/main/java/eu/faircode/email/AdapterRule.java

package eu.faircode.email;

/*
    This file is part of FairEmail.

    FairEmail is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    FairEmail is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with FairEmail.  If not, see <http://www.gnu.org/licenses/>.

    Copyright 2018-2019 by Marcel Bokhorst (M66B)
*/

import android.content.Context;
import android.content.Intent;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;

import java.text.Collator;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import java.util.Locale;

import androidx.annotation.NonNull;
import androidx.lifecycle.LifecycleOwner;
import androidx.localbroadcastmanager.content.LocalBroadcastManager;
import androidx.recyclerview.widget.DiffUtil;
import androidx.recyclerview.widget.ListUpdateCallback;
import androidx.recyclerview.widget.RecyclerView;

public class AdapterRule extends RecyclerView.Adapter<AdapterRule.ViewHolder> {
    private Context context;
    private LifecycleOwner owner;
    private LayoutInflater inflater;

    private List<TupleRuleEx> all = new ArrayList<>();
    private List<TupleRuleEx> filtered = new ArrayList<>();

    public class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
        private View itemView;
        private TextView tvName;
        private TextView tvOrder;
        private ImageView ivStop;

        ViewHolder(View itemView) {
            super(itemView);

            this.itemView = itemView.findViewById(R.id.clItem);
            tvName = itemView.findViewById(R.id.tvName);
            tvOrder = itemView.findViewById(R.id.tvOrder);
            ivStop = itemView.findViewById(R.id.ivStop);
        }

        private void wire() {
            itemView.setOnClickListener(this);
        }

        private void unwire() {
            itemView.setOnClickListener(null);
        }

        private void bindTo(TupleRuleEx rule) {
            itemView.setActivated(!rule.enabled);
            tvName.setText(rule.name);
            tvOrder.setText(Integer.toString(rule.order));
            ivStop.setVisibility(rule.stop ? View.VISIBLE : View.INVISIBLE);
        }

        @Override
        public void onClick(View v) {
            int pos = getAdapterPosition();
            if (pos == RecyclerView.NO_POSITION)
                return;

            TupleRuleEx rule = filtered.get(pos);

            LocalBroadcastManager lbm = LocalBroadcastManager.getInstance(context);
            lbm.sendBroadcast(
                    new Intent(ActivityView.ACTION_EDIT_RULE)
                            .putExtra("id", rule.id)
                            .putExtra("account", rule.account)
                            .putExtra("folder", rule.folder));
        }
    }

    AdapterRule(Context context, LifecycleOwner owner) {
        this.context = context;
        this.owner = owner;
        this.inflater = LayoutInflater.from(context);
        setHasStableIds(true);
    }

    public void set(@NonNull List<TupleRuleEx> rules) {
        Log.i("Set rules=" + rules.size());

        final Collator collator = Collator.getInstance(Locale.getDefault());
        collator.setStrength(Collator.SECONDARY); // Case insensitive, process accents etc

        Collections.sort(rules, new Comparator<TupleRuleEx>() {
            @Override
            public int compare(TupleRuleEx r1, TupleRuleEx r2) {
                int a = collator.compare(r1.accountName, r2.accountName);
                if (a != 0)
                    return a;
                int f = collator.compare(r1.folderName, r2.folderName);
                if (f != 0)
                    return f;
                int o = ((Integer) r1.order).compareTo(r2.order);
                if (o != 0)
                    return 0;
                return collator.compare(r1.name, r2.name);
            }
        });

        all = rules;

        DiffUtil.DiffResult diff = DiffUtil.calculateDiff(new DiffCallback(filtered, all));

        filtered.clear();
        filtered.addAll(all);

        diff.dispatchUpdatesTo(new ListUpdateCallback() {
            @Override
            public void onInserted(int position, int count) {
                Log.i("Inserted @" + position + " #" + count);
            }

            @Override
            public void onRemoved(int position, int count) {
                Log.i("Removed @" + position + " #" + count);
            }

            @Override
            public void onMoved(int fromPosition, int toPosition) {
                Log.i("Moved " + fromPosition + ">" + toPosition);
            }

            @Override
            public void onChanged(int position, int count, Object payload) {
                Log.i("Changed @" + position + " #" + count);
            }
        });
        diff.dispatchUpdatesTo(this);
    }

    private class DiffCallback extends DiffUtil.Callback {
        private List<TupleRuleEx> prev;
        private List<TupleRuleEx> next;

        DiffCallback(List<TupleRuleEx> prev, List<TupleRuleEx> next) {
            this.prev = prev;
            this.next = next;
        }

        @Override
        public int getOldListSize() {
            return prev.size();
        }

        @Override
        public int getNewListSize() {
            return next.size();
        }

        @Override
        public boolean areItemsTheSame(int oldItemPosition, int newItemPosition) {
            TupleRuleEx r1 = prev.get(oldItemPosition);
            TupleRuleEx r2 = next.get(newItemPosition);
            return r1.id.equals(r2.id);
        }

        @Override
        public boolean areContentsTheSame(int oldItemPosition, int newItemPosition) {
            TupleRuleEx r1 = prev.get(oldItemPosition);
            TupleRuleEx r2 = next.get(newItemPosition);
            return r1.equals(r2);
        }
    }

    @Override
    public long getItemId(int position) {
        return filtered.get(position).id;
    }

    @Override
    public int getItemCount() {
        return filtered.size();
    }

    @Override
    @NonNull
    public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        return new ViewHolder(inflater.inflate(R.layout.item_rule, parent, false));
    }

    @Override
    public void onBindViewHolder(@NonNull ViewHolder holder, int position) {
        holder.unwire();
        TupleRuleEx rule = filtered.get(position);
        holder.bindTo(rule);
        holder.wire();
    }
}