<?php

namespace App\Services;

use App\Exceptions\BizException;
use App\Models\DrawActivity;
use App\Models\DrawTicket;
use App\Models\DrawTicketLog;
use App\Models\User;

class DrawTicketService
{
    /**
     * 增加/扣除 用户在给定活动中的抽奖机会
     *
     * @param \App\Models\User $user
     * @param \App\Models\DrawActivity $drawActivity
     * @param int $number
     * @param string|null $remark
     * @return void
     *
     * @throws \App\Exceptions\BizException
     */
    public function change(User $user, DrawActivity $drawActivity, int $number, ?string $remark = null): void
    {
        if ($number === 0) {
            throw new BizException('抽奖次数不能为 0');
        }

        if ($number < 0) {
            $drawTicket = DrawTicket::where([
                'draw_activity_id' => $drawActivity->id,
                'user_id' => $user->id,
            ])->first();

            if ($drawTicket === null || $drawTicket->number + $number < 0) {
                throw new BizException('抽奖次数不足');
            }
        } else {
            $drawTicket = DrawTicket::firstOrCreate([
                'draw_activity_id' => $drawActivity->id,
                'user_id' => $user->id,
            ], [
                'number' => 0,
            ]);
        }

        $drawTicket->increment('number', $number);

        DrawTicketLog::create([
            'draw_activity_id' => $drawActivity->id,
            'user_id' => $user->id,
            'number' => $number,
            'remark' => $remark,
        ]);
    }
}