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package Torello.HTML;

import Torello.Java.LV;
import Torello.Java.StrFilter;

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

class UsingStrFilter
{
    static int[] filter(
            final Vector<? super TagNode>   html,
            final int                       sPos,
            final int                       ePos,
            final StrFilter                 filter
        )
    {
        // Save the list of modified TagNode's in a Java Stream
        IntStream.Builder b = IntStream.builder();

        // Temp Var, Loop Variable
        LV      l   = new LV(sPos, ePos, html);
        TagNode tn;

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

            if ((tn = ((HTMLNode) html.elementAt(i)).openTagPWA()) != null) 
            {
                // Build a list of all inner-tags that must be removed
                String[] innerTagsToRemove = tn
                    .allAN(true, true)                          // Builds attibute Stream<String>
                    .filter(innerTag -> filter.test(innerTag))  // Run the user provided filter
                    .toArray(String[]::new);                    // Stream<String> -> String[]

                if (innerTagsToRemove.length > 0)
                {
                    // Build a new TagNode, and then replace the old one with the newly built one
                    // on the page or sub-page, and at the same location.

                    tn = tn.removeAttributes(innerTagsToRemove);
                    html.setElementAt(tn, i);


                    // Java's IntStream-Builder is just a way to "build" a short list of integer's.
                    // The list shall contain all Vector indices where a "TagNode swap"  occurred

                    b.accept(i);
                }
            }

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

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

        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 TagNode.str Length (in order to have attributes): '<', TOKEN, SPACE '>'
            if (tn.str.length() < (tn.tok.length() + 3)) continue;

            // Build a list of all inner-tags that must be removed
            String[] innerTagsToRemove = tn
                .allAN(true, true)                          // Builds attibute Stream<String>
                .filter(innerTag -> filter.test(innerTag))  // Run the user provided filter
                .toArray(String[]::new);                    // Stream<String> -> String[]

            if (innerTagsToRemove.length > 0)
            {
                // Build a new TagNode, and then replace the old one with the newly built one
                // on the page or sub-page, and at the same location.

                tn = tn.removeAttributes(innerTagsToRemove);
                html.setElementAt(tn, i);


                // Java's IntStream-Builder is just a way to "build" a short list of integer's.
                // The list shall contain all Vector indices where a "TagNode swap"  occurred

                b.accept(i);
            }
        }

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