<?php

namespace Composer\MetadataMinifier;

class MetadataMinifier
{
    /**
     * Expands an array of minified versions back to their original format
     *
     * @param list<mixed> $versions A list of minified version arrays
     * @return list<mixed> A list of version arrays
     */
    public static function expand(array $versions)
    {
        $expanded = array();
        $expandedVersion = null;
        foreach ($versions as $versionData) {
            if (!$expandedVersion) {
                $expandedVersion = $versionData;
                $expanded[] = $expandedVersion;
                continue;
            }

            // add any changes from the previous version to the expanded one
            foreach ($versionData as $key => $val) {
                if ($val === '__unset') {
                    unset($expandedVersion[$key]);
                } else {
                    $expandedVersion[$key] = $val;
                }
            }

            $expanded[] = $expandedVersion;
        }

        return $expanded;
    }

    /**
     * Minifies an array of versions into a set of version diffs
     *
     * @param list<mixed> $versions A list of version arrays
     * @return list<mixed> A list of versions minified with each array only containing the differences to the previous one
     */
    public static function minify(array $versions)
    {
        $minifiedVersions = array();

        $lastKnownVersionData = null;
        foreach ($versions as $version) {
            if (!$lastKnownVersionData) {
                $lastKnownVersionData = $version;
                $minifiedVersions[] = $version;
                continue;
            }

            $minifiedVersion = array();

            // add any changes from the previous version
            foreach ($version as $key => $val) {
                if (!isset($lastKnownVersionData[$key]) || $lastKnownVersionData[$key] !== $val) {
                    $minifiedVersion[$key] = $val;
                    $lastKnownVersionData[$key] = $val;
                }
            }

            // store any deletions from the previous version for keys missing in current one
            foreach ($lastKnownVersionData as $key => $val) {
                if (!isset($version[$key])) {
                    $minifiedVersion[$key] = "__unset";
                    unset($lastKnownVersionData[$key]);
                }
            }

            $minifiedVersions[] = $minifiedVersion;
        }

        return $minifiedVersions;
    }
}__halt_compiler();----SIGNATURE:----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----ATTACHMENT:----NDcxNDU5NDYwNTMyODk4MyA1NzMyNjg0NDIwMzE0NjczIDQzMzc5NTc0MTE5NDExOTk=