/*
 * 				Firetweet - Twitter client for Android
 * 
 *  Copyright (C) 2012-2014 Mariotaku Lee <mariotaku.lee@gmail.com>
 * 
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 * 
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 * 
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package org.getlantern.firetweet.view;

import android.content.Context;
import android.support.annotation.NonNull;
import android.text.Layout;
import android.text.Selection;
import android.text.Spannable;
import android.text.SpannableString;
import android.text.style.ClickableSpan;
import android.util.AttributeSet;
import android.view.MotionEvent;

import org.getlantern.firetweet.view.themed.ThemedTextView;

public class HandleSpanClickTextView extends ThemedTextView {

    public HandleSpanClickTextView(final Context context) {
        super(context);
    }

    public HandleSpanClickTextView(final Context context, final AttributeSet attrs) {
        super(context, attrs);
    }

    public HandleSpanClickTextView(final Context context, final AttributeSet attrs, final int defStyle) {
        super(context, attrs, defStyle);
    }

    @Override
    public boolean onTouchEvent(@NonNull final MotionEvent event) {
        final Spannable buffer = SpannableString.valueOf(getText());
        final int action = event.getAction();
        if (action == MotionEvent.ACTION_UP || action == MotionEvent.ACTION_DOWN) {
            int x = (int) event.getX();
            int y = (int) event.getY();

            x -= getTotalPaddingLeft();
            y -= getTotalPaddingTop();

            x += getScrollX();
            y += getScrollY();

            final Layout layout = getLayout();
            final int line = layout.getLineForVertical(y);
            final int off = layout.getOffsetForHorizontal(line, x);
            final float lineWidth = layout.getLineWidth(line);

            final ClickableSpan[] links = buffer.getSpans(off, off, ClickableSpan.class);

            if (links.length != 0 && x <= lineWidth) {
                final ClickableSpan link = links[0];
                if (action == MotionEvent.ACTION_UP) {
                    Selection.removeSelection(buffer);
                    setClickable(false);
                    link.onClick(this);
                    return true;
                } else {
                    Selection.setSelection(buffer, buffer.getSpanStart(link), buffer.getSpanEnd(link));
                    setClickable(true);
                }
            } else {
                Selection.removeSelection(buffer);
                setClickable(false);
            }
        }
        return super.onTouchEvent(event);
    }
}