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package Torello.HTML;

import Torello.Java.LV;
import Torello.Java.Function.IntTFunction;

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

class Update
{
    static int[] update(
            final Vector<? super TagNode>       html,
            final AUM                           mode,
            final int                           sPos,
            final int                           ePos,
            final String                        innerTag,
            final IntTFunction<TagNode, String> newITValueStrGetter,
            final SD                            quote
        )
    {
        InnerTagKeyException.check(innerTag);

        // Use Java Stream to keep a list of Vector-Locations that were updated / modified.
        IntStream.Builder b = IntStream.builder();


        // This optimization is the same as the one in TagNode.openTagPWA().  However, that method
        // cannot be used here, becaue for AUM.set, zero-attribute TagNode's **ALSO** have to be
        // updated.  So this is re-implemented here.

        int MIN = 3 + innerTag.length();

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

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

            // Only instances of Opening-TagNodes need to be checked - All others should be skipped
            if ((tn = ((HTMLNode) html.elementAt(i)).openTag()) != null)


                // AUM.Set does not require the attribute to already exist
                // **OR** Check for minimum possible str-length to have the attribute at all.

                if ((mode == AUM.Set) || (tn.str.length() >= (MIN + tn.tok.length())))  


                    // If AUM.update returns a **NEW** (non-null) TagNode, replace the old one.
                    // Make sure to use the User-Provided Function-Pointer

                    if ((tn = mode.update(tn, innerTag, newITValueStrGetter.apply(i, tn), quote)) != null)
                    {
                        // Replace the old TagNode
                        html.setElementAt(tn, i);

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

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

    static int[] update(
            final Vector<? super TagNode>       html,
            final AUM                           mode,
            final int[]                         posArr, 
            final String                        innerTag,
            final IntTFunction<TagNode, String> newITValueStrGetter,
            final SD                            quote
        )
    {
        InnerTagKeyException.check(innerTag);

        // Use Java Stream to keep a list of Vector-Locations that were updated / modified.
        IntStream.Builder b = IntStream.builder();


        // minimum possible length to have an attribute at all.
        // '<', TOKEN, SPACE, ATTRIBUTE, '>'

        int MIN = 3 + innerTag.length();

        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);

            // AUM.Set *DOES NOT* require the attribute to exist already (the other *DO*)
            if (mode != AUM.Set)


                // Minimum length of this element before it even could have the named inner-tag
                // '<', TOKEN, SPACE, ATTRIBUTE, '=', '>'

                if (tn.str.length() < (MIN + tn.tok.length())) continue;

                    // Make sure to use the User-Provided Function-Pointer
                    tn = mode.update(tn, innerTag, newITValueStrGetter.apply(i, tn), quote);

            // if 'tn' is non-null ==> an update *WAS* performed
            if (tn != null)
            {
                // Replace the old TagNode
                html.setElementAt(tn, i);

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

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