<?php
namespace app\common\service;

use app\common\logic\BaseCrudLogic;
use support\Request;

class CrudService
{
    protected BaseCrudLogic $logic;

    public function __construct(BaseCrudLogic $logic)
    {
        $this->logic = $logic;
    }

    /**
     * 列表接口
     * 支持前端直接传递：
     *  - filter_* → where
     *  - sort_by, order
     *  - fields (逗号分隔)
     *  - with (逗号分隔)
     *  - withFields (relation:field,field;...)
     *  - dataLimitType, dataLimitField
     *  - limit, page
     *  - complex_query=1 则调用 complexQuery()
     */
    public function list(Request $request): array
    {
        $p = $request->get();

        // 复杂查询开关
        if (!empty($p['complex_query']) && method_exists($this, 'complexQuery')) {
            return $this->complexQuery($p);
        }

        // 1. 构造 where
        $where = [];
        foreach ($p as $k => $v) {
            if (strpos($k, 'filter_') === 0 && $v !== '') {
                $col = substr($k, 7);
                // 简单等值或 like
                $where[$col] = strpos($v, '%') !== false ? ['like', $v] : $v;
            }
        }

        // 2. 构造其他配置
        $config = [
            'where'      => $where,
            'order'      => [($p['sort_by'] ?? 'id') => ($p['order'] ?? 'desc')],
            'fields'     => !empty($p['fields'])     ? explode(',', $p['fields'])     : [],
            'with'       => !empty($p['with'])       ? explode(',', $p['with'])       : [],
            'withFields' => $this->parseWithFields($p['withFields'] ?? ''),
            'dataLimit'  => !empty($p['dataLimitType']) ? [
                'type'  => $p['dataLimitType'],
                'field' => $p['dataLimitField'] ?? 'admin_id'
            ] : [],
        ];

        $limit = (int)($p['limit'] ?? 15);
        $page  = (int)($p['page']  ?? 1);

        $pager = $this->logic->list($config, $limit, $page);
        return ['total' => $pager->total(), 'data' => $pager->items()];
    }

    /**
     * 详情
     */
    public function show($id)
    {
        return $this->logic->show($id, []);
    }

    /**
     * 创建
     */
    public function store(Request $request)
    {
        $data = $request->post();
        $dataLimit = $this->getDataLimitFromRequest($request);
        return $this->logic->create($data, $dataLimit);
    }

    /**
     * 更新
     */
    public function update(Request $request)
    {
        $key = $this->logic->modelClass::make()->getKeyName();
        $id  = (int)$request->post($key);
        $data= $request->post();
        $dataLimit = $this->getDataLimitFromRequest($request);
        return $this->logic->updateByPk($id, $data, $dataLimit);
    }

    /**
     * 删除
     */
    public function destroy(Request $request)
    {
        $key = $this->logic->modelClass::make()->getKeyName();
        $ids = (array)$request->post($key, []);
        return $this->logic->deleteByPk($ids);
    }

    /** ---------- helpers ---------- */

    /**
     * 解析 withFields 参数 "rel:field,field;rel2:..."
     */
    protected function parseWithFields(string $str): array
    {
        if (!$str) return [];
        $out = [];
        foreach (explode(';', $str) as $pair) {
            [$rel, $flds] = explode(':', $pair);
            $out[$rel] = explode(',', $flds);
        }
        return $out;
    }

    /**
     * 从请求里读取 dataLimitType/Field
     */
    protected function getDataLimitFromRequest(Request $req): array
    {
        $type = $req->get('dataLimitType');
        if (!$type) return [];
        return [
            'type'  => $type,
            'field' => $req->get('dataLimitField', 'admin_id'),
        ];
    }

    /**
     * 子类可重写，做复杂联表查询等
     */
    protected function complexQuery(array $params): array
    {
        throw new \LogicException('请在子类实现 complexQuery 方法');
    }
}