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package vn.firstcom.mundipharma.common.adapter;

import android.database.DataSetObserver;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ListAdapter;
import android.widget.SpinnerAdapter;
import android.widget.TextView;

import vn.firstcom.mundipharma.R;

/**
 * Based heavily on the answer provided by HRJ at:
 * http://stackoverflow.com/questions/867518/how-to-make-an-android-spinner-with-initial-text-select-one
 */
public class OptionalSelectionSpinnerAdapter implements SpinnerAdapter, ListAdapter {

    protected static final int EXTRA = 1;
    private final String prompt;
    protected SpinnerAdapter adapter;
    protected LayoutInflater layoutInflater;

    public OptionalSelectionSpinnerAdapter(SpinnerAdapter spinnerAdapter, String prompt) {
        this.adapter = spinnerAdapter;
        this.prompt = prompt;
    }

    @Override
    public final View getView(int position, View convertView, ViewGroup parent) {
        // This provides the View for the Selected Item in the Spinner, not
        // the dropdown (unless dropdownView is not set).
        if (position == 0) {
            return getNothingSelectedView(parent);
        }
        return adapter.getView(position - EXTRA, convertView, parent); // Could re-use
        // the convertView if possible.
    }

    /**
     * View to show in Spinner with Nothing Selected
     * Override this to do something dynamic... e.g. "37 Options Found"
     *
     * @param parent
     * @return
     */
    protected View getNothingSelectedView(ViewGroup parent) {
        if (layoutInflater == null) {
            layoutInflater = LayoutInflater.from(parent.getContext());
        }
        View v = layoutInflater.inflate(R.layout.simple_spinner_dropdown_item, parent, false);
        ((TextView) v.findViewById(android.R.id.text1)).setText(prompt);
        return v;

    }

    @Override
    public View getDropDownView(int position, View convertView, ViewGroup parent) {
        if (position == 0) {
            return getNothingSelectedDropdownView(parent);
        }

        // Could re-use the convertView if possible, use setTag...
        return adapter.getDropDownView(position - EXTRA, convertView, parent);
    }

    /**
     * Override this to do something dynamic... For example, "Pick your favorite
     * of these 37".
     *
     * @param parent
     * @return
     */
    protected View getNothingSelectedDropdownView(ViewGroup parent) {
        if (layoutInflater == null) {
            layoutInflater = LayoutInflater.from(parent.getContext());
        }
        View v = layoutInflater.inflate(R.layout.simple_spinner_dropdown_item, parent, false);
        ((TextView) v.findViewById(android.R.id.text1)).setText(prompt);
        return v;
    }

    @Override
    public int getCount() {
        int count = adapter.getCount();
        return count == 0 ? 0 : count + EXTRA;
    }

    @Override
    public Object getItem(int position) {
        return position == 0 ? null : adapter.getItem(position - EXTRA);
    }

    @Override
    public int getItemViewType(int position) {
        return 0;
    }

    @Override
    public int getViewTypeCount() {
        return 1;
    }

    @Override
    public long getItemId(int position) {
        if (position == 0) {
            return -1;
        } else {
            return adapter.getItemId(position - EXTRA);
        }
    }

    @Override
    public boolean hasStableIds() {
        return adapter.hasStableIds();
    }

    @Override
    public boolean isEmpty() {
        return adapter.isEmpty();
    }

    @Override
    public void registerDataSetObserver(DataSetObserver observer) {
        adapter.registerDataSetObserver(observer);
    }

    @Override
    public void unregisterDataSetObserver(DataSetObserver observer) {
        adapter.unregisterDataSetObserver(observer);
    }

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

    @Override
    public boolean isEnabled(int position) {
        return true;
    }
}