package eu.siacs.conversations.ui.adapter;

import android.content.Context;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.Color;
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.thedevstack.conversationsplus.ConversationsPlusColors;
import de.thedevstack.conversationsplus.ConversationsPlusPreferences;
import de.thedevstack.conversationsplus.ui.listeners.ShowResourcesListDialogListener;
import de.tzur.conversations.Settings;
import eu.siacs.conversations.R;
import eu.siacs.conversations.entities.Account;
import eu.siacs.conversations.entities.Conversation;
import eu.siacs.conversations.entities.Message;
import eu.siacs.conversations.entities.Presences;
import eu.siacs.conversations.entities.Transferable;
import eu.siacs.conversations.services.AvatarService;
import eu.siacs.conversations.ui.ConversationActivity;
import eu.siacs.conversations.ui.XmppActivity;
import eu.siacs.conversations.utils.UIHelper;

public class ConversationAdapter extends ArrayAdapter<Conversation> {

	private XmppActivity activity;

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

	@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);
        // Highlight the currently selected conversation
		if (this.activity instanceof ConversationActivity) {
			ConversationActivity a = (ConversationActivity) this.activity;
			int c = conversation == a.getSelectedConversation() ? ConversationsPlusColors.secondaryBackground() : ConversationsPlusColors.primaryBackground();
			view.findViewById(R.id.conversationListRowContent).setBackgroundColor(c);
            view.findViewById(R.id.conversationListRowFrame).setBackgroundColor(c);
		}
		TextView convName = (TextView) view.findViewById(R.id.conversation_name);
		if (conversation.getMode() == Conversation.MODE_SINGLE || ConversationsPlusPreferences.useSubject()) {
			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);

        if (Settings.SHOW_ONLINE_STATUS) {
            int color = ConversationsPlusColors.offline();
            if (conversation.getAccount().getStatus() == Account.State.ONLINE) {
                if (conversation.getMode() == Conversation.MODE_SINGLE) {
                    color = UIHelper.getStatusColor(conversation.getContact().getMostAvailableStatus());
                } else if (conversation.getMode() == Conversation.MODE_MULTI && conversation.getMucOptions().online()) {
                    color = ConversationsPlusColors.online();
                }
            }
            TextView status = (TextView) view.findViewById(R.id.status);
            status.setBackgroundColor(color);
        }

		Message message = conversation.getLatestMessage();

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

		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, false);
		} else {
			Pair<String,Boolean> preview = UIHelper.getMessagePreview(activity,message);
			mLastMessage.setVisibility(View.VISIBLE);
			imagePreview.setVisibility(View.GONE);
            CharSequence msgText = preview.first;
            String msgPrefix = null;
            if (message.getStatus() == Message.STATUS_SEND
                    || message.getStatus() == Message.STATUS_SEND_DISPLAYED
                    || message.getStatus() == Message.STATUS_SEND_FAILED
                    || message.getStatus() == Message.STATUS_SEND_RECEIVED) {
                msgPrefix = activity.getString(R.string.cplus_me);
            } else if (conversation.getMode() == Conversation.MODE_MULTI) {
                msgPrefix = UIHelper.getMessageDisplayName(message);
            }
            String lastMessagePreview = ((null == msgPrefix || msgPrefix.isEmpty()) ? "" : (msgPrefix + ": ")) + msgText;
            mLastMessage.setText(lastMessagePreview);
			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.setImageResource(R.drawable.ic_notifications_grey600_24dp);
			if (conversation.getMode() == Conversation.MODE_SINGLE) {
				notificationStatus.setVisibility(View.GONE);
			} else {
				notificationStatus.setVisibility(View.VISIBLE);
			}
		} else {
			notificationStatus.setVisibility(View.VISIBLE);
			notificationStatus.setImageResource(R.drawable.ic_notifications_none_grey600_24dp);
		}

		mTimestamp.setText(UIHelper.readableTimeDifference(activity, message.getTimeSent()));
		ImageView profilePicture = (ImageView) view.findViewById(R.id.conversation_image);
        if (conversation.getMode() == Conversation.MODE_SINGLE) {
            profilePicture.setOnLongClickListener(new ShowResourcesListDialogListener(activity, conversation.getContact()));
        }
		loadAvatar(conversation, profilePicture);

		return view;
	}

	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 AvatarService.getInstance().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);
				}
			}
		}
	}

	public void loadAvatar(Conversation conversation, ImageView imageView) {
		if (cancelPotentialWork(conversation, imageView)) {
			final Bitmap bm = AvatarService.getInstance().get(conversation, activity.getPixel(56), true);
			if (bm != null) {
				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) {
				}
			}
		}
	}

	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;
	}

	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();
		}
	}
}