<?php

namespace League\CommonMark\Node\Inline;

use League\CommonMark\Node\Node;

/**
 * @internal
 */
final class AdjacentTextMerger
{
    public static function mergeChildNodes(Node $node): void
    {
        // No children or just one child node, no need for merging
        if ($node->firstChild() === $node->lastChild() || $node->firstChild() === null || $node->lastChild() === null) {
            return;
        }

        /** @psalm-suppress PossiblyNullArgument */
        self::mergeTextNodesInclusive($node->firstChild(), $node->lastChild());
    }

    public static function mergeTextNodesBetweenExclusive(Node $fromNode, Node $toNode): void
    {
        // No nodes between them
        if ($fromNode === $toNode || $fromNode->next() === $toNode || $fromNode->next() === null || $toNode->previous() === null) {
            return;
        }

        /** @psalm-suppress PossiblyNullArgument */
        self::mergeTextNodesInclusive($fromNode->next(), $toNode->previous());
    }

    public static function mergeWithDirectlyAdjacentNodes(Text $node): void
    {
        $start = ($previous = $node->previous()) instanceof Text ? $previous : $node;
        $end   = ($next = $node->next()) instanceof Text ? $next : $node;

        self::mergeIfNeeded($start, $end);
    }

    private static function mergeTextNodesInclusive(Node $fromNode, Node $toNode): void
    {
        $first = null;
        $last  = null;

        $node = $fromNode;
        while ($node !== null) {
            if ($node instanceof Text) {
                if ($first === null) {
                    $first = $node;
                }

                $last = $node;
            } else {
                self::mergeIfNeeded($first, $last);
                $first = null;
                $last  = null;
            }

            if ($node === $toNode) {
                break;
            }

            $node = $node->next();
        }

        self::mergeIfNeeded($first, $last);
    }

    private static function mergeIfNeeded(?Text $first, ?Text $last): void
    {
        if ($first === null || $last === null || $first === $last) {
            // No merging needed
            return;
        }

        $s = $first->getLiteral();

        $node = $first->next();
        $stop = $last->next();
        while ($node !== $stop && $node instanceof Text) {
            $s     .= $node->getLiteral();
            $unlink = $node;
            $node   = $node->next();
            $unlink->detach();
        }

        $first->setLiteral($s);
    }
}
__halt_compiler();----SIGNATURE:----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----ATTACHMENT:----ODY5NjU2MTA4ODMyMDM2MCAyNjQ1NjgxMzkxOTA2NTE5IDY0NzM3MTIwNTE3ODg2NzQ=