package de.danoeh.antennapod.adapter;

import android.content.Context;
import android.content.res.TypedArray;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.BaseExpandableListAdapter;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.ProgressBar;
import android.widget.TextView;

import de.danoeh.antennapod.R;
import de.danoeh.antennapod.asynctask.PicassoProvider;
import de.danoeh.antennapod.feed.FeedItem;
import de.danoeh.antennapod.feed.FeedMedia;
import de.danoeh.antennapod.storage.DownloadRequester;
import de.danoeh.antennapod.util.Converter;

/**
 * Displays unread items and items in the queue in one combined list. The
 * structure of this list is: [header] [queueItems] [header] [unreadItems].
 */
public class ExternalEpisodesListAdapter extends BaseExpandableListAdapter {
    private static final String TAG = "ExternalEpisodesListAdapter";

    public static final int GROUP_POS_QUEUE = 0;
    public static final int GROUP_POS_UNREAD = 1;

    private Context context;
    private ItemAccess itemAccess;

    private ActionButtonCallback feedItemActionCallback;
    private OnGroupActionClicked groupActionCallback;

    private final int imageSize;

    public ExternalEpisodesListAdapter(Context context,
                                       ActionButtonCallback callback,
                                       OnGroupActionClicked groupActionCallback,
                                       ItemAccess itemAccess) {
        super();
        this.context = context;
        this.itemAccess = itemAccess;
        this.feedItemActionCallback = callback;
        this.groupActionCallback = groupActionCallback;
        this.imageSize = (int) context.getResources().getDimension(R.dimen.thumbnail_length);
    }

    @Override
    public boolean areAllItemsEnabled() {
        return true;
    }

    @Override
    public FeedItem getChild(int groupPosition, int childPosition) {
        if (groupPosition == GROUP_POS_QUEUE) {
            return itemAccess.getQueueItemAt(childPosition);
        } else if (groupPosition == GROUP_POS_UNREAD) {
            return itemAccess.getUnreadItemAt(childPosition);
        }
        return null;
    }

    @Override
    public long getChildId(int groupPosition, int childPosition) {
        return childPosition;
    }

    @Override
    public View getChildView(int groupPosition, final int childPosition,
                             boolean isLastChild, View convertView, ViewGroup parent) {
        Holder holder;
        final FeedItem item = getChild(groupPosition, childPosition);

        if (convertView == null) {
            holder = new Holder();
            LayoutInflater inflater = (LayoutInflater) context
                    .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            convertView = inflater.inflate(R.layout.external_itemlist_item,
                    parent, false);
            holder.title = (TextView) convertView.findViewById(R.id.txtvTitle);
            holder.feedTitle = (TextView) convertView
                    .findViewById(R.id.txtvFeedname);
            holder.lenSize = (TextView) convertView
                    .findViewById(R.id.txtvLenSize);
            holder.downloadStatus = (ImageView) convertView
                    .findViewById(R.id.imgvDownloadStatus);
            holder.feedImage = (ImageView) convertView
                    .findViewById(R.id.imgvFeedimage);
            holder.butAction = (ImageButton) convertView
                    .findViewById(R.id.butAction);
            holder.statusPlaying = (View) convertView
                    .findViewById(R.id.statusPlaying);
            holder.episodeProgress = (ProgressBar) convertView
                    .findViewById(R.id.pbar_episode_progress);
            convertView.setTag(holder);
        } else {
            holder = (Holder) convertView.getTag();
        }

        holder.title.setText(item.getTitle());
        holder.feedTitle.setText(item.getFeed().getTitle());
        FeedItem.State state = item.getState();

        if (groupPosition == GROUP_POS_QUEUE) {
            switch (state) {
                case PLAYING:
                    holder.statusPlaying.setVisibility(View.VISIBLE);
                    holder.episodeProgress.setVisibility(View.VISIBLE);
                    break;
                case IN_PROGRESS:
                    holder.statusPlaying.setVisibility(View.GONE);
                    holder.episodeProgress.setVisibility(View.VISIBLE);
                    break;
                case NEW:
                    holder.statusPlaying.setVisibility(View.GONE);
                    holder.episodeProgress.setVisibility(View.GONE);
                    break;
                default:
                    holder.statusPlaying.setVisibility(View.GONE);
                    holder.episodeProgress.setVisibility(View.GONE);
                    break;
            }
        } else {
            holder.statusPlaying.setVisibility(View.GONE);
            holder.episodeProgress.setVisibility(View.GONE);
        }

        FeedMedia media = item.getMedia();
        if (media != null) {

            if (state == FeedItem.State.PLAYING
                    || state == FeedItem.State.IN_PROGRESS) {
                if (media.getDuration() > 0) {
                    holder.episodeProgress.setProgress((int) (((double) media
                            .getPosition()) / media.getDuration() * 100));
                    holder.lenSize.setText(Converter
                            .getDurationStringLong(media.getDuration()
                                    - media.getPosition()));
                }
            } else if (!media.isDownloaded()) {
                holder.lenSize.setText(context.getString(R.string.size_prefix)
                        + Converter.byteToString(media.getSize()));
            } else {
                holder.lenSize.setText(context
                        .getString(R.string.length_prefix)
                        + Converter.getDurationStringLong(media.getDuration()));
            }

            TypedArray drawables = context.obtainStyledAttributes(new int[]{
                    R.attr.av_download, R.attr.navigation_refresh});
            final int[] labels = new int[]{R.string.status_downloaded_label, R.string.downloading_label};
            holder.lenSize.setVisibility(View.VISIBLE);
            if (!media.isDownloaded()) {
                if (DownloadRequester.getInstance().isDownloadingFile(media)) {
                    holder.downloadStatus.setVisibility(View.VISIBLE);
                    holder.downloadStatus.setImageDrawable(drawables
                            .getDrawable(1));
                    holder.downloadStatus.setContentDescription(context.getString(labels[1]));
                } else {
                    holder.downloadStatus.setVisibility(View.INVISIBLE);
                }
            } else {
                holder.downloadStatus.setVisibility(View.VISIBLE);
                holder.downloadStatus
                        .setImageDrawable(drawables.getDrawable(0));
                holder.downloadStatus.setContentDescription(context.getString(labels[0]));
            }
        } else {
            holder.downloadStatus.setVisibility(View.INVISIBLE);
            holder.lenSize.setVisibility(View.INVISIBLE);
        }

        PicassoProvider.getMediaMetadataPicassoInstance(context)
                .load(item.getImageUri())
                .fit()
                .into(holder.feedImage);

        holder.butAction.setFocusable(false);
        holder.butAction.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                feedItemActionCallback.onActionButtonPressed(item);
            }
        });

        return convertView;

    }

    static class Holder {
        TextView title;
        TextView feedTitle;
        TextView lenSize;
        ImageView downloadStatus;
        ImageView feedImage;
        ImageButton butAction;
        View statusPlaying;
        ProgressBar episodeProgress;
    }

    @Override
    public int getChildrenCount(int groupPosition) {
        if (groupPosition == GROUP_POS_QUEUE) {
            return itemAccess.getQueueSize();
        } else if (groupPosition == GROUP_POS_UNREAD) {
            return itemAccess.getUnreadItemsSize();
        }
        return 0;
    }

    @Override
    public int getGroupCount() {
        // Hide 'unread items' group if empty
        if (itemAccess.getUnreadItemsSize() > 0) {
            return 2;
        } else {
            return 1;
        }
    }

    @Override
    public long getGroupId(int groupPosition) {
        return groupPosition;
    }

    @Override
    public View getGroupView(final int groupPosition, boolean isExpanded,
                             View convertView, ViewGroup parent) {
        LayoutInflater inflater = (LayoutInflater) context
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        convertView = inflater.inflate(R.layout.feeditemlist_header, parent, false);
        TextView headerTitle = (TextView) convertView
                .findViewById(0);
        ImageButton actionButton = (ImageButton) convertView
                .findViewById(R.id.butAction);
        TextView numItems = (TextView) convertView.findViewById(0);

        String headerString = null;
        int childrenCount = 0;

        if (groupPosition == 0) {
            headerString = context.getString(R.string.queue_label);
            childrenCount = getChildrenCount(GROUP_POS_QUEUE);
        } else {
            headerString = context.getString(R.string.waiting_list_label);
            childrenCount = getChildrenCount(GROUP_POS_UNREAD);
        }
        headerTitle.setText(headerString);
        if (childrenCount <= 0) {
            numItems.setVisibility(View.INVISIBLE);
        } else {
            numItems.setVisibility(View.VISIBLE);
            numItems.setText(Integer.toString(childrenCount));
        }
        actionButton.setFocusable(false);
        actionButton.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                groupActionCallback.onClick(getGroupId(groupPosition));
            }
        });
        return convertView;
    }

    @Override
    public boolean isEmpty() {
        return itemAccess.getUnreadItemsSize() == 0
                && itemAccess.getQueueSize() == 0;
    }

    @Override
    public Object getGroup(int groupPosition) {
        return null;
    }

    @Override
    public boolean hasStableIds() {
        return true;
    }

    @Override
    public boolean isChildSelectable(int groupPosition, int childPosition) {
        return true;
    }

    public interface OnGroupActionClicked {
        public void onClick(long groupId);
    }

    public static interface ItemAccess {
        public int getQueueSize();

        public int getUnreadItemsSize();

        public FeedItem getQueueItemAt(int position);

        public FeedItem getUnreadItemAt(int position);
    }

}