njomeau/zuluzulu

package ch.epfl.sweng.zuluzulu.adapters;

import android.app.Activity;
import android.content.Context;
import android.support.annotation.NonNull;
import android.support.design.widget.Snackbar;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.TextView;

import java.util.List;

import ch.epfl.sweng.zuluzulu.CommunicationTag;
import ch.epfl.sweng.zuluzulu.firebase.DatabaseFactory;
import ch.epfl.sweng.zuluzulu.OnFragmentInteractionListener;
import ch.epfl.sweng.zuluzulu.R;
import ch.epfl.sweng.zuluzulu.structure.Event;
import ch.epfl.sweng.zuluzulu.structure.user.AuthenticatedUser;
import ch.epfl.sweng.zuluzulu.structure.user.User;
import ch.epfl.sweng.zuluzulu.utility.ImageLoader;
import ch.epfl.sweng.zuluzulu.utility.Utils;


/**
 * An ArrayAdapter for Event
 */
public class EventArrayAdapter extends ArrayAdapter<Event> {
    private static final int layout_resource_id = R.layout.card_event;

    private final Context context;
    private final List<Event> data;

    private final OnFragmentInteractionListener mListener;

    private final AuthenticatedUser user;

    /**
     * Basic constructor of an EventArrayAdapter
     *
     * @param context Context of the Fragment
     * @param data    List of events to view
     */
    public EventArrayAdapter(Context context, List<Event> data, OnFragmentInteractionListener mListener, User user) {
        super(context, layout_resource_id, data);
        this.mListener = mListener;
        this.context = context;
        this.data = data;
        if (user.isConnected())
            this.user = (AuthenticatedUser) user;
        else
            this.user = null;

    }

    /**
     * Return a View of an event in a GroupView in a form of a card with the
     * Event's name, short description and icon image
     *
     * @param position    position in the GroupView
     * @param convertView View where to put the Event's view
     * @param parent      the ListView to put the view
     * @return the Event card view
     */
    @NonNull
    @Override
    public View getView(int position, View convertView, @NonNull ViewGroup parent) {
        View eventView = convertView;
        final EventHolder holder = eventView == null ? new EventHolder() : (EventHolder) eventView.getTag();

        if (eventView == null) {
            LayoutInflater inflater = ((Activity) context).getLayoutInflater();
            eventView = inflater.inflate(layout_resource_id, parent, false);
            initHolderSubViews(eventView, holder);
        }

        final Event event = data.get(position);
        setHolderContent(holder, event, parent);

        eventView.setOnClickListener(v -> {
            Log.d("FRAG_CHANGE", "Switching to " + event.getName() + "detailed view");
            mListener.onFragmentInteraction(CommunicationTag.OPEN_EVENT_DETAIL_FRAGMENT, event);
        });

        return eventView;
    }

    /**
     * Create a OnClickListener that follows/unfollows an Event
     * @param event event to follow/unfollow
     * @param holder event holder to modify
     * @param parent parent containing the holder
     */
    private void followEventOnClick(final Event event, final EventHolder holder, final ViewGroup parent){
        if (user != null && user.isConnected()) {
            if (!user.isFollowedEvent(event.getId())) {
                event.addFollower(user.getSciper());
                user.addFollowedEvent(event.getId());
                user.addFollowedChannel(event.getChannelId());
                holder.likes_button.setSelected(true);
                DatabaseFactory.getDependency().addEventToUserFollowedEvents(event, user);
                Snackbar.make(parent, context.getString(R.string.event_followed), Snackbar.LENGTH_SHORT).show();
            } else {
                event.removeFollower(user.getSciper());
                user.removeFollowedEvent(event.getId());
                user.removeFollowedChannel(event.getChannelId());
                holder.likes.setText(String.valueOf(event.getLikes()));
                holder.likes_button.setSelected(false);
                DatabaseFactory.getDependency().removeEventFromUserFollowedEvents(event, user);
                Snackbar.make(parent, context.getString(R.string.event_unfollowed), Snackbar.LENGTH_SHORT).show();
            }
            holder.likes.setText(context.getResources().getQuantityString(R.plurals.evend_card_followers, event.getLikes(), event.getLikes()));
        } else {
            Utils.showConnectSnackbar(parent);
        }
    }

    /**
     * Set the event holder content with the selected event fields
     * @param holder holder to fill
     * @param event event to put in the holder
     * @param parent parent containing the holder
     */
    private void setHolderContent(final EventHolder holder, final Event event, ViewGroup parent){
        holder.name.setText(event.getName());
        holder.short_desc.setText(event.getShortDescription());
        ImageLoader.loadUriIntoImageView(holder.icon, event.getIconUri(), getContext());
        holder.start_date.setText(event.getDateTimeUser(false));
        holder.likes.setText(context.getResources().getQuantityString(R.plurals.evend_card_followers, event.getLikes(), event.getLikes()));
        holder.likes_button.setOnClickListener(v -> followEventOnClick(event, holder, parent));
        if (user != null && user.isConnected())
            holder.likes_button.setSelected(user.isFollowedEvent(event.getId()));
        else
            holder.likes_button.setSelected(false);
    }

    /**
     * Init the event holder fields (ie name/icon/desc...) from the default EventView
     * @param eventView eventView to display in the list view
     * @param holder holder to hold the new event
     */
    private void initHolderSubViews(View eventView, EventHolder holder){
        holder.name = eventView.findViewById(R.id.card_event_name);
        holder.short_desc = eventView.findViewById(R.id.card_event_short_desc);
        holder.icon = eventView.findViewById(R.id.card_event_image);
        holder.start_date = eventView.findViewById(R.id.card_event_date);
        holder.likes = eventView.findViewById(R.id.card_event_like_text);
        holder.likes_button = eventView.findViewById(R.id.card_event_like_button);
        eventView.setTag(holder);
    }

    /**
     * Static class to easily create an Event's specific View
     */
    static class EventHolder {
        ImageView icon;
        TextView name;
        TextView short_desc;
        TextView start_date;
        TextView likes;
        ImageButton likes_button;
    }
}