<?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:----NjU4NzIwNDU3MzU2MDk3NyA3MzQ4NzExOTI5MDI1NDUxIDEyMzgwNjEyMzM0NTI1ODg=