<?php
declare(strict_types=1);
namespace plugin\saiadmin\app\service\alerts;

use plugin\saiadmin\app\model\water\{WaterAlertSetting, WaterModel, WaterLedger};
use plugin\saiadmin\exception\ApiException;

final class AlertSettings
{
    public function current(): array
    {
        $row=WaterAlertSetting::query()->find(1);
        if (!$row) throw new ApiException('请先初始化平台预警策略');
        return $this->present($row->toArray());
    }

    private function present(array $row): array
    {
        return ['alert_qty'=>(int)$row['alert_qty'],'days_per_barrel'=>(int)$row['days_per_barrel'],
            'urgent_qty'=>(int)$row['urgent_qty'],'revision'=>(int)$row['revision'],
            'updated_at'=>$row['updated_at'],'comparison'=>'lt','accuracy_available'=>false];
    }

    public function save(array $input, int $actor): array
    {
        foreach (['id','threshold_qty','enterprise_id','account_id'] as $key) {
            if (array_key_exists($key,$input)) throw new ApiException('此入口仅保存平台统一策略，不支持企业账户阈值');
        }
        $values=[];
        foreach (['alert_qty'=>[1,10000000],'days_per_barrel'=>[1,365],'urgent_qty'=>[0,9999999],'revision'=>[1,2147483646]] as $key=>[$min,$max]) {
            $v=$input[$key]??null;
            if ((!is_int($v)&&!is_string($v)) || filter_var($v,FILTER_VALIDATE_INT)===false || (int)$v<$min || (int)$v>$max) {
                throw new ApiException('策略参数必须为范围内整数：'.$key);
            }
            $values[$key]=(int)$v;
        }
        if ($values['urgent_qty'] >= $values['alert_qty']) throw new ApiException('紧急预警桶数必须小于补货预警桶数');
        return WaterModel::transaction(function () use ($values,$actor) {
            $row=WaterAlertSetting::query()->lockForUpdate()->find(1);
            if (!$row) throw new ApiException('请先初始化平台预警策略');
            if ((int)$row->revision!==$values['revision']) throw new ApiException('策略已被其他操作员修改，请重新打开后编辑');
            $before=$this->present($row->toArray());
            $row->fill($values+['updated_by'=>$actor,'updated_at'=>date('Y-m-d H:i:s')]);
            $row->revision=$values['revision']+1;
            $row->save();
            $after=$this->present($row->toArray());
            WaterLedger::query()->insert(['kind'=>'alert_policy','created_by'=>$actor,'sku_id'=>0,'enterprise_id'=>0,
                'quantity'=>0,'reference'=>'platform:alerts','note'=>'平台预警：桶数'.$before['alert_qty'].'→'.$after['alert_qty']
                    .'；每桶天数'.$before['days_per_barrel'].'→'.$after['days_per_barrel'].'；紧急桶数'.$before['urgent_qty'].'→'.$after['urgent_qty'],
                'created_at'=>date('Y-m-d H:i:s')]);
            return $after;
        });
    }
}