<?php
// +----------------------------------------------------------------------
// | YwxApp [ WE CAN DO IT JUST THINK ]
// +----------------------------------------------------------------------
// | Copyright (c) 2026-2036 http://ywxapp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Author: ywxapp<admin@ywxapp.cn>
// +----------------------------------------------------------------------
declare (strict_types = 1);

namespace addon\wxchat\controller\api;

use addon\wxchat\model\WxchatLotteryPrize;
use addon\wxchat\model\WxchatLotteryRecord;
use think\facade\Db;
use think\facade\Request;
use ywxapp\controller\FrontendBase;
use ywxapp\service\WalletService;

/**
 * Lottery 类
 *
 * @author ywxapp <admin@ywxapp.cn>
 */
class Lottery extends FrontendBase
{
    protected $noNeedLogin = [];
    protected $noNeedVerify = ['*'];

    // 每次抽奖消耗金币
    protected $cost = 10;
    // 每日免费次数
    protected $freeDaily = 1;

    
    protected function initialize()
    {
        if ($this->auth->isLogin) {
            $this->uid = $this->auth->model->uid;
        }
    }

    private $uid = 0;

    /**
     * 抽奖配置（奖品列表 + 我的金币 + 剩余免费次数）
     */
    public function config()
    {
        $uid = $this->uid;
        $prizes = WxchatLotteryPrize::where('status', 1)
            ->order('sort', 'asc')
            ->field('id,name,type,value,probability')
            ->select();
        $freeUsed = WxchatLotteryRecord::where('uid', $uid)
            ->where('is_free', 1)
            ->where('create_at', '>=', strtotime('today'))
            ->count();
        $this->success([
            'coins'      => WalletService::getCoins($uid),
            'cost'       => $this->cost,
            'free_daily' => $this->freeDaily,
            'free_left'  => max(0, $this->freeDaily - $freeUsed),
            'prizes'     => $prizes,
        ]);
    }

    /**
     * 抽奖（金币或免费）
     */
    public function draw()
    {
        $uid = $this->uid;

        // 是否使用免费次数
        $freeUsed = WxchatLotteryRecord::where('uid', $uid)
            ->where('is_free', 1)
            ->where('create_at', '>=', strtotime('today'))
            ->count();
        $useFree = Request::post('use_free', 0) && $freeUsed < $this->freeDaily;

        if (! $useFree) {
            try {
                WalletService::decCoins($uid, $this->cost, '抽奖消耗');
            } catch (\Throwable $e) {
                $this->error($e->getMessage());
            }
        }

        $prize = $this->pickPrize();
        $record = new WxchatLotteryRecord();
        $record->uid         = $uid;
        $record->prize_id    = $prize ? $prize->id : 0;
        $record->prize_name  = $prize ? $prize->name : '谢谢参与';
        $record->prize_type  = $prize ? $prize->type : 3;
        $record->prize_value = $prize ? $prize->value : 0;
        $record->is_free     = $useFree ? 1 : 0;
        $record->save();

        // 金币奖品发放
        if ($prize && $prize->type == 1 && $prize->value > 0) {
            WalletService::incCoins($uid, (int) $prize->value, "抽奖中奖:{$prize->name}");
        }

        $this->success([
            'prize'      => $record->prize_name,
            'prize_type' => $record->prize_type,
            'prize_value'=> $record->prize_value,
            'coins_left' => WalletService::getCoins($uid),
        ], '抽奖完成');
    }

    /**
     * 按概率加权抽取奖品（无命中返回 null）
     */
    private function pickPrize()
    {
        $prizes = WxchatLotteryPrize::where('status', 1)
            ->where('stock', '<>', 0)
            ->order('sort', 'asc')
            ->select();
        if ($prizes->isEmpty()) {
            return null;
        }
        $rand = mt_rand(1, 10000) / 10000; // 0-1
        $acc  = 0.0;
        foreach ($prizes as $p) {
            $acc += (float) $p->probability;
            if ($rand <= $acc) {
                // 扣库存
                if ($p->stock > 0) {
                    Db::name('wxchat_lottery_prizes')->where('id', $p->id)->dec('stock')->update(['update_at' => time()]);
                }
                return $p;
            }
        }
        return null;
    }
}