<?php

namespace Modules\EcommerceFinance\Services;

use InvalidArgumentException;
use Modules\EcommerceFinance\Repositories\GenericBusinessMirrorRepository;
use Symfony\Component\HttpKernel\Exception\ServiceUnavailableHttpException;

/** Backend primitive: callers must retain their existing company/permission checks. */
class BusinessMirrorDataReader
{
    public function __construct(
        private readonly BusinessMirrorDatasetRegistry $datasets,
        private readonly BusinessMirrorSchemaManager $schemas,
        private readonly GenericBusinessMirrorRepository $mirror,
    ) {}

    public function paginate(string $key, array $filters = [], int $page = 1, int $perPage = 25): array
    {
        $dataset = $this->datasets->get($key);
        if (! $this->mirror->ready($dataset)) {
            throw new ServiceUnavailableHttpException(30, '该数据集尚未完成首次同步，请查看同步状态；页面不会临时访问上游。');
        }
        $columns = array_column($this->schemas->columns($dataset), 'column_name');
        $query = $this->mirror->connection()->table($dataset->targetTable());
        foreach ($filters as $column => $value) {
            if (! in_array($column, $columns, true) || (! is_scalar($value) && $value !== null)) {
                throw new InvalidArgumentException('镜像筛选字段或值无效。');
            }
            $query->where($column, $value);
        }
        $total = (clone $query)->count();
        foreach ($dataset->keyColumns() as $column) $query->orderBy($column);
        $page = max($page, 1);
        $perPage = min(max($perPage, 1), 100);
        $state = $this->mirror->state($dataset);
        return [
            'rows' => $query->select($columns)->offset(($page - 1) * $perPage)->limit($perPage)->get()
                ->map(fn ($row) => (array) $row)->all(),
            'total' => $total, 'page' => $page, 'per_page' => $perPage,
            'last_page' => max((int) ceil($total / $perPage), 1),
            'sync_status' => $state['status'] ?? 'unknown',
            'last_succeeded_at' => $state['last_succeeded_at'] ?? null,
        ];
    }
}