<?php

namespace App\Http\Middleware;

use App\Libs\MyLib;
use Closure;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Validator;

class ParamVerify
{
    /**
     * Handle an incoming request.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  \Closure  $next
     * @return mixed
     */
    public function handle(Request $request, Closure $next)
    {
        $rules = $request->get('rules');
        $attributes = $request->get('attributes');
        array_walk($attributes, function(&$value){
            if(is_array($value)) $value = $value['title'];
        });
        if(count($rules) > 0) {
            $validator = Validator::make($request->input(), $rules['rules'], $rules['messages'] ?? [], $attributes);
            if (isset($rules['custom']) && $rules['custom']) {
                $param = $request->input();
                if($request->route('id')){
                    $param['id'] = $request->route('id');
                }
                $validator->after(function ($validator) use ($rules, &$param, &$attributes) {
                    $data = true;
                    if(is_array($rules['custom'])){
                        foreach ($rules['custom'] as $callback){
                            $data = $this->validate(explode(',', $callback), $param, $attributes);
                            if($data !== true){
                                break;
                            }
                        }
                    } else {
                        $data = $this->validate(explode(',', $rules['custom']), $param, $attributes);
                    }
                    if (is_array($data)) {
                        $validator->errors()->add($data['field'], $data['message']);
                    }
                });
            }

            if ($validator->fails()) {
                return response()->json(['code' => 422, 'msg' => $validator->errors()->first(), 'data' => $validator->errors()->all()], 400);
            }
        }
        return $next($request);
    }

    private function validate($rule, $param, $attributes)
    {
        switch ($rule[0]) {
            case 'exists':
                $model = new $rule[1]();
                if ($model->where($rule[2], $param[$rule[2]])->count() > 0) {
                    return true;
                } else {
                    return ['field' => 'id', 'message' => '当前信息不存在'];
                }
                break;
            case 'unique':
                $model = new $rule[1]();
                $msg = $attributes[$rule[2]];
                $model = $model->where($rule[2], $param[$rule[2]]);
                if((count($rule)) >= 4){
                    foreach ($rule as $key => $item){
                        if($item == 'id'){
                            $model = $model->where('id', '<>', $param['id']);
                        } else if($key > 2){
                            $msg .= '--'. $attributes[$item];
                            $model = $model->where($item, $param[$item]);
                        }
                    }
                }
                if ($model->count() > 0) {
                    return ['field' => 'id', 'message' => $msg .' 字段已存在'];
                } else {
                    return true;
                }
                break;
            case 'ip_check':
                $model = new $rule[1]();
                $ip_addrs = explode(',', $model->where('name', $rule[2])->value('content'));
                if (in_array(MyLib::GetClientIP(), $ip_addrs)) {
                    return true;
                } else {
                    return ['field' => 'ip', 'message' => '禁止外网访问'];
                }
                break;
            case 'regx':
                $pattern = config('patterns.' . $rule[1]);
                if(isset($pattern[$param[$rule[3]]])){
                    $pattern = $pattern[$param[$rule[3]]];
                }
                if (preg_match($pattern['pattern'], $param[$rule[2]]) > 0) {
                    return true;
                } else {
                    return ['field' => '$rule[2]', 'message' => $attributes[$rule[2]] . ' 字段格式错误'];
                }
                break;
        }
    }

    private function calc($operator, $value1, $value2)
    {
        switch ($operator){
            case 'eq':
                return $value1 == $value2;
            case 'neq':
                return $value1 != $value2;
            case 'gt':
                return $value1 > $value2;
            case 'egt':
                return $value1 >= $value2;
            case 'lt':
                return $value1 < $value2;
            case 'elt':
                return $value1 <= $value2;
            case 'heq':
                return $value1 === $value2;
            case 'nheq':
                return $value1 !== $value2;
        }
    }
}