import android.content.Context;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Filter;
import android.widget.Filterable;
import android.widget.TextView;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.List;

public class SearchPupItenAdapter<T> extends BaseAdapter implements Filterable {

    private List<T> mObjects;
    private final Object mLock = new Object();
    private int mResource;
    private int mDropDownResource;
    private int mFieldId = 0;
    private boolean mNotifyOnChange = true;
    private Context mContext;
    private ArrayList<T> mOriginalValues;
    private ArrayFilter mFilter;
    private LayoutInflater mInflater;

    public SearchPupItenAdapter(Context context, int resource, List<T> objects) {
        init(context, resource, 0, objects);
    }

    @Override
    public void notifyDataSetChanged() {
        super.notifyDataSetChanged();
        mNotifyOnChange = true;
    }

    private void init(Context context, int resource, int textViewResourceId, List<T> objects) {
        mContext = context;
        mInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        mResource = mDropDownResource = resource;
        mObjects = objects;
        mFieldId = textViewResourceId;
    }

    public int getCount() {
        return mObjects.size();
    }

    public T getItem(int position) {
        return mObjects.get(position);
    }

    public long getItemId(int position) {
        return position;
    }

    public View getView(int position, View convertView, ViewGroup parent) {
        return createViewFromResource(position, convertView, parent, mResource);
    }

    private View createViewFromResource(int position, View convertView, ViewGroup parent, int resource) {
        View view;
        TextView text;

        if (convertView == null) {
            view = mInflater.inflate(resource, parent, false);
        }
        else {
            view = convertView;
        }

        try {
            if (mFieldId == 0) {

                text = (TextView) view;
            }
            else {
                text = (TextView) view.findViewById(mFieldId);
            }
        } catch (ClassCastException e) {
            Log.e("ArrayAdapter", "You must supply a resource ID for a TextView");
            throw new IllegalStateException("ArrayAdapter requires the resource ID to be a TextView", e);
        }

        T item = getItem(position);
        if (item instanceof CharSequence) {
            text.setText((CharSequence) item);
        }
        else {
            text.setText(item.toString());
        }

        return view;
    }

    @Override
    public View getDropDownView(int position, View convertView, ViewGroup parent) {
        return createViewFromResource(position, convertView, parent, mDropDownResource);
    }

    public Filter getFilter() {
        if (mFilter == null) {
            mFilter = new ArrayFilter();
        }
        return mFilter;
    }

    private class ArrayFilter extends Filter {
        @Override
        protected FilterResults performFiltering(CharSequence prefix) {
            FilterResults results = new FilterResults();

            if (mOriginalValues == null) {
                synchronized (mLock) {
                    mOriginalValues = new ArrayList<T>(mObjects);
                }
            }

            if (prefix == null || prefix.length() == 0) {
                ArrayList<T> list;
                synchronized (mLock) {
                    list = new ArrayList<T>(mOriginalValues);
                }
                results.values = list;
                results.count = list.size();
            }
            else {
                String prefixString = prefix.toString().toLowerCase();

                ArrayList<T> values;
                synchronized (mLock) {
                    values = new ArrayList<T>(mOriginalValues);
                }

                final int count = values.size();
                final ArrayList<T> newValues = new ArrayList<T>();

                for (int i = 0; i < count; i++) {
                    final T value = values.get(i);
                    final String valueText = value.toString().toLowerCase();

                    if (valueText.startsWith(prefixString)) {
                        newValues.add(value);
                    }
                    else {
                        final String[] words = valueText.split(" ");
                        final int wordCount = words.length;
                        for (int k = 0; k < wordCount; k++) {
                            if (words[k].indexOf(prefixString) != -1) {
                                newValues.add(value);
                                break;
                            }
                        }
                    }
                }

                results.values = newValues;
                results.count = newValues.size();
            }

            return results;
        }

        @Override
        protected void publishResults(CharSequence constraint, FilterResults results) {
            mObjects = (List<T>) results.values;
            if (results.count > 0) {
                notifyDataSetChanged();
            }
            else {
                Toast.makeText(mContext, "沒有數據", Toast.LENGTH_SHORT).show();
                notifyDataSetInvalidated();

            }
        }

    }
}