<?php

namespace App\Services\Inventory;

class InventoryMetaSanitizer
{
    /**
     * @param  array<string, mixed>  $meta
     * @return array{odata_type?: string, etag?: string|null, scope_tag_ids?: list<string>, assignment_target_count?: int|null, warnings?: list<string>}
     */
    public function sanitize(array $meta): array
    {
        $sanitized = [];

        $odataType = $meta['odata_type'] ?? null;
        if (is_string($odataType) && trim($odataType) !== '') {
            $sanitized['odata_type'] = trim($odataType);
        }

        $etag = $meta['etag'] ?? null;
        if ($etag === null || is_string($etag)) {
            $sanitized['etag'] = $etag === null ? null : trim($etag);
        }

        $scopeTagIds = $meta['scope_tag_ids'] ?? null;
        if (is_array($scopeTagIds)) {
            $sanitized['scope_tag_ids'] = $this->stringList($scopeTagIds);
        }

        $assignmentTargetCount = $meta['assignment_target_count'] ?? null;
        if (is_int($assignmentTargetCount)) {
            $sanitized['assignment_target_count'] = $assignmentTargetCount;
        } elseif (is_numeric($assignmentTargetCount)) {
            $sanitized['assignment_target_count'] = (int) $assignmentTargetCount;
        } elseif ($assignmentTargetCount === null) {
            $sanitized['assignment_target_count'] = null;
        }

        $warnings = $meta['warnings'] ?? null;
        if (is_array($warnings)) {
            $sanitized['warnings'] = $this->boundedStringList($warnings, 25, 200);
        }

        return array_filter(
            $sanitized,
            static fn (mixed $value): bool => $value !== null && $value !== [] && $value !== ''
        );
    }

    /**
     * @param  list<mixed>  $values
     * @return list<string>
     */
    private function stringList(array $values): array
    {
        $result = [];

        foreach ($values as $value) {
            if (! is_string($value)) {
                continue;
            }

            $value = trim($value);
            if ($value === '') {
                continue;
            }

            $result[] = $value;
        }

        return array_values(array_unique($result));
    }

    /**
     * @param  list<mixed>  $values
     * @return list<string>
     */
    private function boundedStringList(array $values, int $maxItems, int $maxLen): array
    {
        $items = [];

        foreach ($values as $value) {
            if (count($items) >= $maxItems) {
                break;
            }

            if (! is_string($value)) {
                continue;
            }

            $value = trim($value);
            if ($value === '') {
                continue;
            }

            $items[] = mb_substr($value, 0, $maxLen);
        }

        return array_values(array_unique($items));
    }
}