<?php

namespace App\Module\Mex\Logic;

use App\Module\Mex\Models\MexOrder;
use App\Module\Mex\Models\MexPriceConfig;
use App\Module\Mex\Enums\OrderType;
use App\Module\Mex\Enums\OrderStatus;
use App\Module\Mex\Events\OrderCreatedEvent;
use App\Module\Fund\Enums\FUND_CURRENCY_TYPE;
use App\Module\Mex\Logic\FundLogic;
use App\Module\GameItems\Services\ItemService;
use App\Module\GameItems\Enums\FREEZE_REASON_TYPE;
use Illuminate\Support\Facades\DB;
use UCore\Helper\Logger;

/**
 * 农贸市场订单逻辑
 *
 * 处理订单相关的核心业务逻辑
 */
class MexOrderLogic
{
    /**
     * 创建卖出订单
     *
     * @param int $userId 用户ID
     * @param int $itemId 商品ID
     * @param int $quantity 数量
     * @param float $price 价格（信任Fund模块的数据处理）
     * @param FUND_CURRENCY_TYPE|null $currencyType 币种类型，默认使用钻石
     * @return array 操作结果
     */
    public static function createSellOrder(int $userId, int $itemId, int $quantity, float $price, ?FUND_CURRENCY_TYPE $currencyType = null): array
    {
        // 检查事务状态，确保调用者已开启事务
        \UCore\Db\Helper::check_tr();

        // 获取币种类型，默认使用钻石
        $currencyType = $currencyType ?? FundLogic::getDefaultCurrency();

        // 验证价格配置是否存在（不验证价格范围，挂单阶段无价格验证）
        $priceConfig = MexPriceConfig::where('item_id', $itemId)->where('is_enabled', true)->first();
        if (!$priceConfig) {
            return ['success' => false, 'message' => '商品未配置价格信息'];
        }

        // 直接计算总金额，信任Fund模块的精度处理
        $totalAmount = bcmul($price , $quantity,9);

        try {
            // 1. 验证用户是否有足够的物品
            $checkResult = ItemService::checkItemQuantity($userId, $itemId, $quantity);
            if (!$checkResult->success) {
                return ['success' => false, 'message' => $checkResult->message];
            }

            // 2. 创建订单记录
            $order = MexOrder::create([
                'user_id' => $userId,
                'item_id' => $itemId,
                'currency_type' => $currencyType->value,
                'order_type' => OrderType::SELL,
                'quantity' => $quantity,
                'price' => $price,
                'total_amount' => $totalAmount,
                'status' => OrderStatus::PENDING,
            ]);

            // 3. 冻结用户物品
            $freezeResult = ItemService::freezeItem(
                $userId,
                $itemId,
                null, // 统一属性物品，不需要实例ID
                $quantity,
                "农贸市场卖出订单冻结，订单ID：{$order->id}",
                [
                    'reason_type' => FREEZE_REASON_TYPE::TRADE_ORDER->value,
                    'source_id' => $order->id,
                    'source_type' => 'mex_sell_order',
                ]
            );

            if (!$freezeResult['success']) {
                throw new \Exception('冻结物品失败：' . $freezeResult['message']);
            }

            // 4. 触发订单创建事件
            event(new OrderCreatedEvent($order));

            return [
                'success' => true,
                'order_id' => $order->id,
                'freeze_log_id' => $freezeResult['freeze_log_id'] ?? null,
                'message' => '卖出订单创建成功，等待撮合'
            ];
        } catch (\Exception $e) {
            return ['success' => false, 'message' => '创建订单失败：' . $e->getMessage()];
        }
    }

    /**
     * 创建买入订单
     *
     * @param int $userId 用户ID
     * @param int $itemId 商品ID
     * @param int $quantity 数量
     * @param float $price 价格（信任Fund模块的数据处理）
     * @param FUND_CURRENCY_TYPE|null $currencyType 币种类型，默认使用钻石
     * @return array 操作结果
     */
    public static function createBuyOrder(int $userId, int $itemId, int $quantity, float $price, ?FUND_CURRENCY_TYPE $currencyType = null): array
    {
        // 检查事务状态，确保调用者已开启事务
        \UCore\Db\Helper::check_tr();

        // 获取币种类型，默认使用钻石
        $currencyType = $currencyType ?? FundLogic::getDefaultCurrency();

        // 验证价格配置是否存在（不验证价格范围和保护阈值，挂单阶段无价格验证）
        $priceConfig = MexPriceConfig::where('item_id', $itemId)->where('is_enabled', true)->first();
        if (!$priceConfig) {
            return ['success' => false, 'message' => '商品未配置价格信息'];
        }

        // 直接计算总金额，信任Fund模块的精度处理
        $totalAmount = bcmul($price , $quantity,9) ;
        Logger::debug(" create ");

        try {
            // 1. 创建订单记录
            $order = MexOrder::create([
                'user_id' => $userId,
                'item_id' => $itemId,
                'currency_type' => $currencyType->value,
                'order_type' => OrderType::BUY,
                'quantity' => $quantity,
                'price' => $price,
                'total_amount' => $totalAmount,
                'status' => OrderStatus::PENDING,
                'frozen_amount' => $totalAmount,
            ]);
            // 2. 冻结用户资金
            $freezeResult = self::freezeOrderFunds($order);
            if (!$freezeResult['success']) {
                return ['success' => false, 'message' => '冻结资金失败：' . $freezeResult['message']];
            }

            // 触发订单创建事件
            event(new OrderCreatedEvent($order));

            return [
                'success' => true,
                'order_id' => $order->id,
                'message' => '买入订单创建成功，等待撮合'
            ];
        } catch (\Exception $e) {
            return ['success' => false, 'message' => '创建订单失败：' . $e->getMessage()];
        }
    }


    /**
     * 取消订单
     *
     * @param int $userId 用户ID
     * @param int $orderId 订单ID
     * @return array 操作结果
     */
    public static function cancelOrder(int $userId, int $orderId): array
    {
        // 检查事务状态，确保调用者已开启事务
        \UCore\Db\Helper::check_tr();

        $order = MexOrder::where('id', $orderId)->where('user_id', $userId)->first();
        if (!$order) {
            return ['success' => false, 'message' => '订单不存在'];
        }

        if ($order->status !== OrderStatus::PENDING) {
            return ['success' => false, 'message' => '只能取消等待中的订单'];
        }

        try {
            // 1. 更新订单状态为取消
            $order->update(['status' => OrderStatus::CANCELLED]);

            // 2. 处理解冻逻辑
            if ($order->order_type === OrderType::SELL) {
                // 卖出订单：解冻物品
                $unfreezeResult = self::unfreezeOrderItems($order);
                if (!$unfreezeResult['success']) {
                    return ['success' => false, 'message' => '解冻物品失败：' . $unfreezeResult['message']];
                }
            } elseif ($order->order_type === OrderType::BUY) {
                // 买入订单：解冻资金
                $unfreezeResult = self::unfreezeOrderFunds($order);
                if (!$unfreezeResult['success']) {
                    return ['success' => false, 'message' => '解冻资金失败：' . $unfreezeResult['message']];
                }
            }

            return ['success' => true, 'message' => '订单已取消'];
        } catch (\Exception $e) {
            return ['success' => false, 'message' => '取消订单失败：' . $e->getMessage()];
        }
    }

    /**
     * 获取用户订单列表
     *
     * @param int $userId 用户ID
     * @param int $page 页码
     * @param int $pageSize 每页数量
     * @return array 订单列表
     */
    public static function getUserOrders(int $userId, int $page = 1, int $pageSize = 20, $itemId =  null): array
    {
        $where['user_id'] = $userId;
        if ($itemId) {
            $where['item_id'] = $itemId;
        }
        $orders = MexOrder::where($where)
            ->orderBy('created_at', 'desc')
            ->paginate($pageSize, ['*'], 'page', $page);

        return [
            'orders' => $orders->items(),
            'total' => $orders->total(),
            'page' => $page,
            'page_size' => $pageSize,
        ];
    }

    /**
     * 获取订单详情
     *
     * @param int $userId 用户ID
     * @param int $orderId 订单ID
     * @return array|null 订单详情
     */
    public static function getOrderDetail(int $userId, int $orderId): ?array
    {
        $order = MexOrder::where('id', $orderId)->where('user_id', $userId)->first();
        return $order ? $order->toArray() : null;
    }

    /**
     * 解冻订单相关的物品（卖出订单取消时使用）
     *
     * @param MexOrder $order 订单对象
     * @return array 解冻结果
     */
    private static function unfreezeOrderItems(MexOrder $order): array
    {
        try {
            // 查找该订单相关的冻结记录
            $freezeLogs = \App\Module\GameItems\Models\ItemFreezeLog::where('source_id', $order->id)
                ->where('source_type', 'mex_sell_order')
                ->where('action_type', \App\Module\GameItems\Enums\FREEZE_ACTION_TYPE::FREEZE)
                ->get();

            if ($freezeLogs->isEmpty()) {
                return ['success' => true, 'message' => '没有找到需要解冻的物品'];
            }

            $unfrozenCount = 0;
            foreach ($freezeLogs as $freezeLog) {
                try {
                    // 使用ItemService解冻物品
                    \App\Module\GameItems\Services\ItemService::unfreezeItem($freezeLog->id);
                    $unfrozenCount++;
                } catch (\Exception $e) {
                    // 记录错误但继续处理其他冻结记录
                    \Log::error("解冻物品失败", [
                        'order_id' => $order->id,
                        'freeze_log_id' => $freezeLog->id,
                        'error' => $e->getMessage()
                    ]);
                }
            }

            return [
                'success' => true,
                'message' => "成功解冻 {$unfrozenCount} 个冻结记录",
                'unfrozen_count' => $unfrozenCount
            ];
        } catch (\Exception $e) {
            return ['success' => false, 'message' => $e->getMessage()];
        }
    }

    /**
     * 冻结订单相关的资金（买入订单创建时使用）
     *
     * @param MexOrder $order 订单对象
     * @return array 冻结结果
     */
    private static function freezeOrderFunds(MexOrder $order): array
    {
        try {
            // 获取可用账户类型和冻结账户类型
            $availableAccountType = FundLogic::getAvailableAccountType($order->currency_type);
            $frozenAccountType = FundLogic::getFrozenAccountType($order->currency_type);

            if (!$availableAccountType || !$frozenAccountType) {
                return ['success' => false, 'message' => '不支持的币种类型'];
            }

            // 创建Fund服务实例（可用账户）
            $fundService = new \App\Module\Fund\Services\FundService($order->user_id, $availableAccountType->value);

            // 验证用户可用余额是否充足
            if ($fundService->balance() < $order->frozen_amount) {
                return ['success' => false, 'message' => '可用余额不足'];
            }

            // 使用circulation方法将资金从可用账户转移到冻结账户
            $circulationResult = $fundService->circulation(
                $frozenAccountType,
                (float)$order->frozen_amount,
                $order->id,
                'mex_buy_order',
                "农贸市场买入订单冻结，订单ID：{$order->id}"
            );

            if (is_string($circulationResult)) {
                return ['success' => false, 'message' => '资金冻结失败：' . $circulationResult];
            }

            return [
                'success' => true,
                'message' => '资金冻结成功',
                'frozen_amount' => $order->frozen_amount,
                'circulation_id' => $circulationResult->id ?? null
            ];
        } catch (\Exception $e) {
            return ['success' => false, 'message' => '冻结资金异常：' . $e->getMessage()];
        }
    }

    /**
     * 解冻订单相关的资金（买入订单取消时使用）
     *
     * @param MexOrder $order 订单对象
     * @return array 解冻结果
     */
    private static function unfreezeOrderFunds(MexOrder $order): array
    {
        try {
            // 获取可用账户类型和冻结账户类型
            $availableAccountType = FundLogic::getAvailableAccountType($order->currency_type);
            $frozenAccountType = FundLogic::getFrozenAccountType($order->currency_type);

            if (!$availableAccountType || !$frozenAccountType) {
                return ['success' => false, 'message' => '不支持的币种类型'];
            }

            // 创建Fund服务实例（冻结账户）
            $fundService = new \App\Module\Fund\Services\FundService($order->user_id, $frozenAccountType->value);

            // 验证冻结账户余额是否充足
            if ($fundService->balance() < $order->frozen_amount) {
                return ['success' => false, 'message' => '冻结账户余额不足，可能已被解冻'];
            }

            // 使用circulation方法将资金从冻结账户转移回可用账户
            $circulationResult = $fundService->circulation(
                $availableAccountType,
                (float)  $order->frozen_amount,
                $order->id,
                'mex_buy_order_cancel',
                "农贸市场买入订单取消解冻，订单ID：{$order->id}"
            );

            if (is_string($circulationResult)) {
                return ['success' => false, 'message' => '资金解冻失败：' . $circulationResult];
            }

            return [
                'success' => true,
                'message' => '资金解冻成功',
                'unfrozen_amount' => $order->frozen_amount,
                'circulation_id' => $circulationResult->id ?? null
            ];
        } catch (\Exception $e) {
            return ['success' => false, 'message' => '解冻资金异常：' . $e->getMessage()];
        }
    }

    /**
     * 获取待撮合的买入订单
     * 根据文档要求：二级排序（价格DESC + 时间ASC），移除数量排序
     *
     * @param int $itemId 商品ID
     * @param int $limit 限制数量
     * @return array 订单列表
     */
    public static function getPendingBuyOrders(int $itemId, int $limit = 100): array
    {
        $orders = MexOrder::where('item_id', $itemId)
            ->where('order_type', OrderType::BUY)
            ->where('status', OrderStatus::PENDING)
            ->orderBy('price', 'desc')      // 价格优先（高价优先）
            ->orderBy('created_at', 'asc')  // 时间优先（早下单优先）
            ->limit($limit)
            ->get();

        return $orders->toArray();
    }
}