<?php

namespace App\Service;

use App\BaseApp\BaseService;
use App\Models\FileFolderModel;
use App\Models\FileModel;
use Exception;
use Psr\Container\ContainerExceptionInterface;
use Psr\Container\NotFoundExceptionInterface;

/**
 * 素材文件夹
 *
 * 纯逻辑目录：只改 nl_file.folder_id，不碰对象在 OSS 上的实际路径。
 */
class FileFolderService extends BaseService
{
    public function __construct()
    {
        parent::__construct();
        $this->model = FileFolderModel::class;
        $this->selectField = ['id', 'pid', 'name', 'sort', 'status', 'created_at', 'updated_at'];
        $this->queryField = ['name' => 'like', 'pid' => '=', 'status' => '='];
        $this->orderBy = ['name' => 'sort', 'sort' => 'asc'];
    }

    /**
     * 列表，带每个文件夹下的素材数
     *
     * @throws ContainerExceptionInterface
     * @throws NotFoundExceptionInterface
     */
    public function list(): array
    {
        $result = $this->getPageList();
        $ids = array_column($result['items'], 'id');
        $counts = empty($ids)
            ? []
            : FileModel::whereIn('folder_id', $ids)
                ->where('deleted_at', 0)
                ->selectRaw('folder_id, COUNT(*) as total')
                ->groupBy('folder_id')
                ->pluck('total', 'folder_id')
                ->all();

        foreach ($result['items'] as &$item) {
            $item['file_count'] = (int) ($counts[$item['id']] ?? 0);
        }
        unset($item);
        return $result;
    }

    /**
     * 目录树，素材库左侧栏直接用它渲染
     */
    public function option(): array
    {
        $rows = FileFolderModel::where('deleted_at', 0)
            ->orderBy('sort')
            ->orderBy('id')
            ->get(['id', 'pid', 'name', 'sort'])
            ->toArray();
        return $this->utils->tree($rows);
    }

    /**
     * @throws Exception
     */
    public function detail($id): mixed
    {
        return $this->getDetail($id);
    }

    /**
     * @throws Exception
     */
    public function create($params): mixed
    {
        $params['pid'] = $this->assertParent((int) ($params['pid'] ?? 0));
        return $this->insert($params);
    }

    /**
     * @throws Exception
     */
    public function update($id, $params): mixed
    {
        if (array_key_exists('pid', $params)) {
            $pid = (int) $params['pid'];
            if ($pid === (int) $id) {
                $this->utils->errorThrow('上级文件夹不能是自己');
            }
            $params['pid'] = $this->assertParent($pid);
        }
        return $this->save($id, $params);
    }

    /**
     * 删除文件夹：有子目录或仍有素材时拒绝
     *
     * 直接删会让里面的素材挂在一个查不到的 folder_id 上，
     * 按文件夹筛选时那批文件就再也点不出来 —— 文件还在，人找不到。
     *
     * @throws Exception
     */
    public function delete($id): mixed
    {
        $ids = array_values(array_filter(array_map('intval', is_array($id) ? $id : [$id])));
        if (empty($ids)) {
            $this->utils->errorThrow('参数错误');
        }
        if (FileFolderModel::whereIn('pid', $ids)->where('deleted_at', 0)->exists()) {
            $this->utils->errorThrow('存在子文件夹，请先删除子文件夹');
        }
        if (FileModel::whereIn('folder_id', $ids)->where('deleted_at', 0)->exists()) {
            $this->utils->errorThrow('该文件夹下仍有素材，请先移动素材');
        }
        return $this->del($ids);
    }

    /**
     * @throws Exception
     */
    private function assertParent(int $pid): int
    {
        if ($pid <= 0) {
            return 0;
        }
        if (!FileFolderModel::where('id', $pid)->where('deleted_at', 0)->exists()) {
            $this->utils->notFound('上级文件夹不存在');
        }
        return $pid;
    }
}