<?php

namespace App\Module\AppGame\Handler\Shop;

use App\Module\AppGame\Handler\BaseHandler;
use App\Module\Game\Enums\REWARD_SOURCE_TYPE;
use App\Module\Game\Services\ConsumeService;
use App\Module\Game\Services\RewardService;
use App\Module\Shop\Validations\ShopBuyValidation;
use Google\Protobuf\Internal\Message;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Log;
use UCore\Helper\Logger;
use Uraus\Kku\Request\RequestShopBuy;
use Uraus\Kku\Response\ResponseShopBuy;
use UCore\Exception\LogicException;

/**
 * 处理商品购买请求
 */
class BuyHandler extends BaseHandler
{

    /**
     * 是否需要登录
     *
     * @var bool
     */
    protected bool $need_login = true;

    /**
     * 处理商品购买请求
     *
     * @param RequestShopBuy $data 商品购买请求数据
     * @return ResponseShopBuy 商品购买响应
     */
    public function handle(Message $data): Message
    {
        // 创建响应对象
        $response = new ResponseShopBuy();

        try {
            // 获取请求参数
            $goodId = $data->getGoodId();
            $number = $data->getNumber();
            $userId = $this->user_id;

            // 先进行验证，避免不必要的事务开销
            $validation = new ShopBuyValidation([
                                                    'user_id' => $userId,
                                                    'good_id' => $goodId,
                                                    'number'  => $number
                                                ]);

            // 验证数据
            $validation->validated();

            // 从验证结果中获取商品信息
            $shopItem = $validation->shop_item;

            // 验证通过后，开启事务
            DB::beginTransaction();

            // 执行消耗组逻辑（如果商品有消耗组）

            // 支持购买多个数量

            $consumeResult = ConsumeService::executeConsume(
                $userId,
                $shopItem->consume_group_id,
                REWARD_SOURCE_TYPE::SHOP_PURCHASE,
                $goodId,
                false,// 不重复检查，因为验证阶段已经检查过
                $number
            );

            if (!$consumeResult->success) {
                throw new LogicException("消耗资源失败：" . $consumeResult->message);
            }


            // 支持购买多个数量
            $rewardResult = RewardService::grantReward(
                $userId,
                $shopItem->reward_group_id,
                REWARD_SOURCE_TYPE::SHOP_PURCHASE,
                $goodId,
                $number
            );

            if (!$rewardResult->success) {
                throw new LogicException("发放奖励失败：" . $rewardResult->errorMessage);
            }


            // 记录购买记录（总价暂时设为0，因为不再有固定价格）
            $shopItem->recordPurchase($userId, $number, 0);

            // 更新限购计数
            $shopItem->updatePurchaseLimitCounters($userId, $number);

            // 提交事务
            DB::commit();

            // 记录日志
            Log::info('用户购买商品成功', [
                'user_id'           => $userId,
                'good_id'           => $goodId,
                'number'            => $number,
                'consume_group_id'  => $shopItem->consume_group_id,
                'reward_group_id'   => $shopItem->reward_group_id,
                'shop_item_name'    => $shopItem->name,
                'has_consume_group' => !empty($shopItem->consume_group_id),
                'has_reward_group'  => !empty($shopItem->reward_group_id)
            ]);

        } catch (\Exception $e) {
            // 系统异常，需要回滚事务
            if (DB::transactionLevel() > 0) {
                DB::rollBack();
            }

            Logger::exception('购买商品操作异常', $e, [
                'user_id' => $userId ?? null,
                'good_id' => $goodId ?? null,
                'number'  => $number ?? null,
            ]);

            // 重新抛出异常，交由框架处理
            throw $e;
        }

        return $response;
    }

}