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package Torello.HTML;

import Torello.Java.LV;

import java.util.Vector;
import java.util.stream.IntStream;

class RemoveData
{
    static int[] removeData(
            final Vector<? super TagNode>   html,
            final int                       sPos,
            final int                       ePos
        )
    {
        // Use Java Stream to keep a list of Vector-Locations that were updated / modified.
        IntStream.Builder b = IntStream.builder();

        // Loop Counter & Temporary Variables
        LV      l   = new LV(sPos, ePos, html);
        TagNode tn, newTN;

        for (int i=l.start; i < l.end; i++)

            // Only instances of Opening-TagNodes, possibly with attributes
            if ((tn = ((HTMLNode) html.elementAt(i)).openTagPWA()) != null)

                // A "new" TagNode is *only returned* if the "data-attributes" were removed.
                if ((newTN = tn.removeDataAttributes()) != tn)
                {                                                   
                    html.setElementAt(newTN, i);    // Replace the old TagNode
                    b.accept(i);                    // Make sure to keep the index where it resides
                }                                   // Method returns list of modified node's

        // Build the IntStream, Convert the IntStream -> int[], Return it.
        return b.build().toArray();
    }


    static int[] removeData(
            final Vector<? super TagNode>   html,
            final int[]                     posArr
        )
    {        
        // Use Java Stream to keep a list of Vector-Locations that were updated / modified.
        IntStream.Builder b = IntStream.builder();


        // Minimum Length of TagNode.str to even have a "data-*=" attribute
        // '<', HTML-TOKEN, SPACE, "data-*", '>'

        int MIN = 9;

        for (int i: posArr)
        {
            HTMLNode n = (HTMLNode) html.elementAt(i);

            if (! n.isTagNode()) throw new TagNodeExpectedException(i);

            TagNode tn = (TagNode) n;

            if (tn.isClosing) throw new OpeningTagNodeExpectedException(i);

            // Minimum Length of TagNode.str to even have a "data-*=" attribute
            if (tn.str.length() < (tn.tok.length() + MIN)) continue;

            TagNode newTN = tn.removeDataAttributes();


            // A "new" TagNode is *only returned* by this method if the "data-attributes" were
            // removed.  If new, replace the old TagNode

            if (newTN != tn)
            {                    
                html.setElementAt(newTN, i);

                // Make sure to keep the index where it resides, so it may be returned to the user
                b.accept(i);
            }
        }

        // Build the IntStream, Convert the IntStream -> int[], Return it.
        return b.build().toArray();
    }
}