<?php
declare(strict_types=1);
namespace plugin\saiadmin\app\service\content;

use Illuminate\Database\Eloquent\Builder;

/** One status rule for management lists and audience previews, using Shanghai wall time. */
final class ContentPolicy
{
    public const LABELS = ['active' => '投放中', 'scheduled' => '待上线', 'expired' => '已结束', 'disabled' => '已停用'];

    public static function status(array $row, string $now): string
    {
        if ((int)$row['status'] !== 1) return 'disabled';
        if ($row['starts_at'] && $row['starts_at'] > $now) return 'scheduled';
        if ($row['ends_at'] && $row['ends_at'] < $now) return 'expired';
        return 'active';
    }

    public static function filter(Builder $query, string $status, string $now): Builder
    {
        if ($status === '') return $query;
        if ($status === 'disabled') return $query->where('status', '<>', 1);
        $query->where('status', 1);
        if ($status === 'scheduled') return $query->where('starts_at', '>', $now);
        $query->where(fn ($q) => $q->whereNull('starts_at')->orWhere('starts_at', '<=', $now));
        if ($status === 'expired') return $query->where('ends_at', '<', $now);
        return $query->where(fn ($q) => $q->whereNull('ends_at')->orWhere('ends_at', '>=', $now));
    }
}