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package de.pixart.messenger.ui.adapter;

import android.content.Context;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.Typeface;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.os.AsyncTask;
import android.util.Pair;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.TextView;

import java.lang.ref.WeakReference;
import java.util.List;
import java.util.concurrent.RejectedExecutionException;

import de.pixart.messenger.R;
import de.pixart.messenger.entities.Conversation;
import de.pixart.messenger.entities.Message;
import de.pixart.messenger.entities.Transferable;
import de.pixart.messenger.ui.ConversationActivity;
import de.pixart.messenger.ui.XmppActivity;
import de.pixart.messenger.utils.UIHelper;
import de.pixart.messenger.xmpp.chatstate.ChatState;

public class ConversationAdapter extends ArrayAdapter<Conversation> {

    private XmppActivity activity;

    public ConversationAdapter(XmppActivity activity,
                               List<Conversation> conversations) {
        super(activity, 0, conversations);
        this.activity = activity;
    }

    public static boolean cancelPotentialWork(Conversation conversation, ImageView imageView) {
        final BitmapWorkerTask bitmapWorkerTask = getBitmapWorkerTask(imageView);

        if (bitmapWorkerTask != null) {
            final Conversation oldConversation = bitmapWorkerTask.conversation;
            if (oldConversation == null || conversation != oldConversation) {
                bitmapWorkerTask.cancel(true);
            } else {
                return false;
            }
        }
        return true;
    }

    private static BitmapWorkerTask getBitmapWorkerTask(ImageView imageView) {
        if (imageView != null) {
            final Drawable drawable = imageView.getDrawable();
            if (drawable instanceof AsyncDrawable) {
                final AsyncDrawable asyncDrawable = (AsyncDrawable) drawable;
                return asyncDrawable.getBitmapWorkerTask();
            }
        }
        return null;
    }

    @Override
    public View getView(int position, View view, ViewGroup parent) {
        if (view == null) {
            LayoutInflater inflater = (LayoutInflater) activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            view = inflater.inflate(R.layout.conversation_list_row, parent, false);
        }
        Conversation conversation = getItem(position);
        if (this.activity instanceof ConversationActivity) {
            View swipeableItem = view.findViewById(R.id.swipeable_item);
            ConversationActivity a = (ConversationActivity) this.activity;
            int c = a.highlightSelectedConversations() && conversation == a.getSelectedConversation() ? a.getSecondaryBackgroundColor() : a.getPrimaryBackgroundColor();
            swipeableItem.setBackgroundColor(c);
        }
        TextView convName = (TextView) view.findViewById(R.id.conversation_name);
        if (conversation.getMode() == Conversation.MODE_SINGLE || activity.useSubjectToIdentifyConference()) {
            convName.setText(conversation.getName());
        } else {
            convName.setText(conversation.getJid().toBareJid().toString());
        }
        TextView mLastMessage = (TextView) view.findViewById(R.id.conversation_lastmsg);
        TextView mTimestamp = (TextView) view.findViewById(R.id.conversation_lastupdate);
        ImageView imagePreview = (ImageView) view.findViewById(R.id.conversation_lastimage);
        ImageView notificationStatus = (ImageView) view.findViewById(R.id.notification_status);
        TextView mUnread = (TextView) view.findViewById(R.id.conversation_unread);
        TextView mFailed = (TextView) view.findViewById(R.id.conversation_failed);
        Message message = conversation.getLatestMessage();
        int unreadcount = conversation.unreadCount();
        int failedcount = conversation.failedCount();

        if (!conversation.isRead()) {
            convName.setTypeface(null, Typeface.BOLD);
        } else {
            convName.setTypeface(null, Typeface.NORMAL);
        }

        if (unreadcount > 0) {
            mUnread.setVisibility(View.VISIBLE);
            mUnread.setText(String.valueOf(unreadcount));
        } else {
            mUnread.setVisibility(View.GONE);
        }
        if (failedcount > 0) {
            mFailed.setVisibility(View.VISIBLE);
            mFailed.setText(String.valueOf(failedcount));
        } else {
            mFailed.setVisibility(View.GONE);
        }

        if (message.getFileParams().width > 0
                && (message.getTransferable() == null
                || message.getTransferable().getStatus() != Transferable.STATUS_DELETED)) {
            mLastMessage.setVisibility(View.GONE);
            imagePreview.setVisibility(View.VISIBLE);
            activity.loadBitmap(message, imagePreview);
        } else {
            Pair<String, Boolean> preview = UIHelper.getMessagePreview(activity, message);
            mLastMessage.setVisibility(View.VISIBLE);
            imagePreview.setVisibility(View.GONE);
            mLastMessage.setText(preview.first);
            if (preview.second) {
                if (conversation.isRead()) {
                    mLastMessage.setTypeface(null, Typeface.ITALIC);
                } else {
                    mLastMessage.setTypeface(null, Typeface.BOLD_ITALIC);
                }
            } else {
                if (conversation.isRead()) {
                    mLastMessage.setTypeface(null, Typeface.NORMAL);
                } else {
                    mLastMessage.setTypeface(null, Typeface.BOLD);
                }
            }
        }

        long muted_till = conversation.getLongAttribute(Conversation.ATTRIBUTE_MUTED_TILL, 0);
        if (muted_till == Long.MAX_VALUE) {
            notificationStatus.setVisibility(View.VISIBLE);
            notificationStatus.setImageResource(R.drawable.ic_notifications_off_grey600_24dp);
        } else if (muted_till >= System.currentTimeMillis()) {
            notificationStatus.setVisibility(View.VISIBLE);
            notificationStatus.setImageResource(R.drawable.ic_notifications_paused_grey600_24dp);
        } else if (conversation.alwaysNotify()) {
            notificationStatus.setVisibility(View.GONE);
        } else {
            notificationStatus.setVisibility(View.VISIBLE);
            notificationStatus.setImageResource(R.drawable.ic_notifications_none_grey600_24dp);
        }

        mTimestamp.setText(UIHelper.readableTimeDifference(activity, conversation.getLatestMessage().getTimeSent()));
        ImageView profilePicture = (ImageView) view.findViewById(R.id.conversation_image);
        loadAvatar(conversation, profilePicture);

        if (conversation.getIncomingChatState().equals(ChatState.COMPOSING)) {
            mLastMessage.setText(R.string.is_typing);
            mLastMessage.setTypeface(null, Typeface.BOLD_ITALIC);
        }
        return view;
    }

    public void loadAvatar(Conversation conversation, ImageView imageView) {
        if (cancelPotentialWork(conversation, imageView)) {
            final Bitmap bm = activity.avatarService().get(conversation, activity.getPixel(56), true);
            if (bm != null) {
                cancelPotentialWork(conversation, imageView);
                imageView.setImageBitmap(bm);
                imageView.setBackgroundColor(0x00000000);
            } else {
                imageView.setBackgroundColor(UIHelper.getColorForName(conversation.getName()));
                imageView.setImageDrawable(null);
                final BitmapWorkerTask task = new BitmapWorkerTask(imageView);
                final AsyncDrawable asyncDrawable = new AsyncDrawable(activity.getResources(), null, task);
                imageView.setImageDrawable(asyncDrawable);
                try {
                    task.execute(conversation);
                } catch (final RejectedExecutionException ignored) {
                }
            }
        }
    }

    static class AsyncDrawable extends BitmapDrawable {
        private final WeakReference<BitmapWorkerTask> bitmapWorkerTaskReference;

        public AsyncDrawable(Resources res, Bitmap bitmap, BitmapWorkerTask bitmapWorkerTask) {
            super(res, bitmap);
            bitmapWorkerTaskReference = new WeakReference<>(bitmapWorkerTask);
        }

        public BitmapWorkerTask getBitmapWorkerTask() {
            return bitmapWorkerTaskReference.get();
        }
    }

    class BitmapWorkerTask extends AsyncTask<Conversation, Void, Bitmap> {
        private final WeakReference<ImageView> imageViewReference;
        private Conversation conversation = null;

        public BitmapWorkerTask(ImageView imageView) {
            imageViewReference = new WeakReference<>(imageView);
        }

        @Override
        protected Bitmap doInBackground(Conversation... params) {
            return activity.avatarService().get(params[0], activity.getPixel(56));
        }

        @Override
        protected void onPostExecute(Bitmap bitmap) {
            if (bitmap != null) {
                final ImageView imageView = imageViewReference.get();
                if (imageView != null) {
                    imageView.setImageBitmap(bitmap);
                    imageView.setBackgroundColor(0x00000000);
                }
            }
        }
    }
}