<?php

namespace App\Services\Auth;

use Modules\EcommerceFinance\Services\UpstreamReadOnlyQueryFactory;

/** Single-person, current HR authorization lookup; no HR rows or stale grants are cached. */
class FinanceRoster
{
    public static function isDesignatedSuperAdmin(string $userId): bool
    {
        return $userId !== '' && in_array($userId, config('dingtalk.super_admin_user_ids', []), true);
    }

    public function __construct(private readonly UpstreamReadOnlyQueryFactory $queries)
    {
    }

    public function findEligible(string $userId): ?array
    {
        if (trim($userId) === '') {
            return null;
        }

        $query = $this->queries->forSource('operations_replica');
        $flowers = $query->select(
            'SELECT TOP (2) Id, name, flowerName, deptId, status, empStatus, leaveDate
             FROM rpt.hr_flowerName_book WHERE flowerNameId = ? AND leaveDate IS NULL
             ORDER BY Id DESC', [$userId]
        );
        if (count($flowers) !== 1) {
            return null;
        }
        $flower = $flowers[0];
        if ($this->isResigned($flower['status'] ?? null) || $this->isResigned($flower['empStatus'] ?? null)) {
            return null;
        }
        if ($query->first('SELECT TOP (1) userid FROM rpt.hr_employee_dimission WHERE userid = ?', [$userId])) {
            return null;
        }

        $employees = $query->select('SELECT TOP (2) active, dept_id_list FROM rpt.hr_employee WHERE userid = ?', [$userId]);
        if (count($employees) > 1 || (isset($employees[0]['active']) && ! (bool) $employees[0]['active'])) {
            return null;
        }
        $registrations = $query->select(
            'SELECT TOP (20) [sys01-employeeStatus] AS employment_status, [sys00-deptIds] AS department_ids,
             [sys00-mainDeptId] AS main_department_id FROM rpt.hr_employee_register WHERE userid = ?', [$userId]
        );
        if (count($registrations) === 20) {
            return null;
        }

        $departmentIds = $this->departmentIds($flower['deptId'] ?? null);
        foreach ($employees as $employee) {
            $departmentIds = array_merge($departmentIds, $this->departmentIds($employee['dept_id_list'] ?? null));
        }
        foreach ($registrations as $registration) {
            if ($this->isResigned($registration['employment_status'] ?? null)) {
                return null;
            }
            $departmentIds = array_merge($departmentIds,
                $this->departmentIds($registration['department_ids'] ?? null),
                $this->departmentIds($registration['main_department_id'] ?? null));
        }
        $departmentIds = array_values(array_unique($departmentIds));
        if ($departmentIds === [] || count($departmentIds) > 64) {
            return null;
        }

        $placeholders = implode(',', array_fill(0, count($departmentIds), '?'));
        $ancestors = $query->select(
            'WITH lineage AS (
                SELECT Id, parent_id, 0 AS depth FROM rpt.hr_groups WHERE Id IN ('.$placeholders.')
                UNION ALL
                SELECT parent.Id, parent.parent_id, child.depth + 1
                FROM rpt.hr_groups parent JOIN lineage child ON parent.Id = child.parent_id
                WHERE child.depth < 20
             ) SELECT TOP (2048) Id, parent_id, depth FROM lineage', $departmentIds
        );
        if (count($ancestors) === 2048 || array_filter($ancestors, fn ($row) => (int) $row['depth'] >= 20)) {
            return null;
        }
        $allowed = array_map('strval', config('dingtalk.finance_department_ids', []));
        if (! self::isDesignatedSuperAdmin($userId)
            && ! array_intersect($allowed, array_map('strval', array_column($ancestors, 'Id')))) {
            return null;
        }

        return [
            'roster_id' => (string) $flower['Id'],
            'display_name' => trim((string) ($flower['flowerName'] ?: $flower['name'])),
            'department_ids' => $departmentIds,
        ];
    }

    private function isResigned(mixed $value): bool
    {
        $status = trim((string) $value);
        return $status === '5' || preg_match('/离职|停用|退休/u', $status) === 1;
    }

    private function departmentIds(mixed $value): array
    {
        $value = trim((string) $value);
        $parts = json_decode($value, true);
        if (! is_array($parts)) {
            $parts = preg_split('/[\[\]\/>,，;；|｜\s]+/u', $value, -1, PREG_SPLIT_NO_EMPTY);
        }
        return array_values(array_filter(array_map(
            fn ($id) => is_scalar($id) ? trim((string) $id) : '', $parts
        ), fn ($id) => ctype_digit($id) && (int) $id > 0));
    }
}