<?php

namespace App\Module\Mex\Logic;

use App\Module\Mex\Models\MexTransaction;
use App\Module\Mex\Enums\TransactionType;
use App\Module\Mex\Events\TransactionCreatedEvent;
use Illuminate\Support\Facades\DB;

/**
 * 农贸市场成交记录逻辑
 * 
 * 处理成交记录相关的核心业务逻辑
 */
class MexTransactionLogic
{
    /**
     * 获取交易大厅成交记录
     * 
     * @param int $page 页码
     * @param int $pageSize 每页数量
     * @param int|null $itemId 商品ID筛选
     * @return array 成交记录列表
     */
    public static function getPublicTransactions(int $page = 1, int $pageSize = 20, ?int $itemId = null): array
    {
        $query = MexTransaction::query()
            ->where('is_admin_operation', false) // 只显示用户交易，不显示管理员操作
            ->orderBy('created_at', 'desc');

        if ($itemId) {
            $query->where('item_id', $itemId);
        }

        $transactions = $query->paginate($pageSize, ['*'], 'page', $page);

        $result = [];
        foreach ($transactions->items() as $transaction) {
            // 根据交易类型确定显示的用户ID
            // USER_SELL表示用户卖出，显示卖方ID；USER_BUY表示用户买入，显示买方ID
            $userId = ($transaction->transaction_type->value === 'USER_SELL')
                ? $transaction->seller_id
                : $transaction->buyer_id;

            $result[] = [
                'id' => $transaction->id,
                'user_id' => $userId,
                'item_id' => $transaction->item_id,
                'quantity' => $transaction->quantity,
                'price' => $transaction->price,
                'total_amount' => $transaction->total_amount,
                'transaction_type' => $transaction->transaction_type->value,
                'transaction_type_desc' => $transaction->transaction_type->getDescription(),
                'created_at' => $transaction->created_at,
            ];
        }

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

    /**
     * 获取用户成交记录
     * 
     * @param int $userId 用户ID
     * @param int $page 页码
     * @param int $pageSize 每页数量
     * @return array 成交记录列表
     */
    public static function getUserTransactions(int $userId, int $page = 1, int $pageSize = 20): array
    {
        $transactions = MexTransaction::where(function ($query) use ($userId) {
            $query->where('buyer_id', $userId)
                  ->orWhere('seller_id', $userId);
        })
        ->where('is_admin_operation', false)
        ->orderBy('created_at', 'desc')
        ->paginate($pageSize, ['*'], 'page', $page);

        $result = [];
        foreach ($transactions->items() as $transaction) {
            $isUserBuyer = $transaction->buyer_id === $userId;
            $isUserSeller = $transaction->seller_id === $userId;
            
            $result[] = [
                'id' => $transaction->id,
                'item_id' => $transaction->item_id,
                'quantity' => $transaction->quantity,
                'price' => $transaction->price,
                'total_amount' => $transaction->total_amount,
                'transaction_type' => $transaction->transaction_type->value,
                'transaction_type_desc' => $transaction->transaction_type->getDescription(),
                'user_role' => $isUserBuyer ? 'buyer' : ($isUserSeller ? 'seller' : 'unknown'),
                'user_role_desc' => $isUserBuyer ? '买方' : ($isUserSeller ? '卖方' : '未知'),
                'counterparty_id' => $isUserBuyer ? $transaction->seller_id : $transaction->buyer_id,
                'created_at' => $transaction->created_at,
            ];
        }

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

    /**
     * 获取商品成交统计
     * 
     * @param int $itemId 商品ID
     * @param int $days 统计天数
     * @return array 统计信息
     */
    public static function getItemTransactionStats(int $itemId, int $days = 7): array
    {
        $startDate = now()->subDays($days)->startOfDay();
        
        $stats = MexTransaction::where('item_id', $itemId)
            ->where('created_at', '>=', $startDate)
            ->selectRaw('
                COUNT(*) as total_transactions,
                SUM(quantity) as total_quantity,
                SUM(total_amount) as total_amount,
                AVG(price) as avg_price,
                MIN(price) as min_price,
                MAX(price) as max_price
            ')
            ->first();

        $latestPrice = self::getLatestPrice($itemId);

        return [
            'item_id' => $itemId,
            'days' => $days,
            'total_transactions' => $stats->total_transactions ?? 0,
            'total_quantity' => $stats->total_quantity ?? 0,
            'total_amount' => $stats->total_amount ?? '0.00000',
            'avg_price' => $stats->avg_price ? number_format($stats->avg_price, 5) : '0.00000',
            'min_price' => $stats->min_price ?? '0.00000',
            'max_price' => $stats->max_price ?? '0.00000',
            'latest_price' => $latestPrice,
            'start_date' => $startDate,
            'end_date' => now(),
        ];
    }

    /**
     * 获取市场成交统计
     * 
     * @param int $days 统计天数
     * @return array 统计信息
     */
    public static function getMarketStats(int $days = 7): array
    {
        $startDate = now()->subDays($days)->startOfDay();
        
        $stats = MexTransaction::where('created_at', '>=', $startDate)
            ->selectRaw('
                COUNT(*) as total_transactions,
                COUNT(DISTINCT item_id) as active_items,
                SUM(quantity) as total_quantity,
                SUM(total_amount) as total_amount,
                AVG(price) as avg_price
            ')
            ->first();

        // 按交易类型统计
        $typeStats = MexTransaction::where('created_at', '>=', $startDate)
            ->groupBy('transaction_type')
            ->selectRaw('
                transaction_type,
                COUNT(*) as count,
                SUM(quantity) as quantity,
                SUM(total_amount) as amount
            ')
            ->get();

        $typeStatsFormatted = [];
        foreach ($typeStats as $typeStat) {
            $typeStatsFormatted[$typeStat->transaction_type] = [
                'count' => $typeStat->count,
                'quantity' => $typeStat->quantity,
                'amount' => $typeStat->amount,
            ];
        }

        return [
            'days' => $days,
            'total_transactions' => $stats->total_transactions ?? 0,
            'active_items' => $stats->active_items ?? 0,
            'total_quantity' => $stats->total_quantity ?? 0,
            'total_amount' => $stats->total_amount ?? '0.00000',
            'avg_price' => $stats->avg_price ? number_format($stats->avg_price, 5) : '0.00000',
            'type_stats' => $typeStatsFormatted,
            'start_date' => $startDate,
            'end_date' => now(),
        ];
    }

    /**
     * 获取商品最新成交价格
     * 
     * @param int $itemId 商品ID
     * @return string|null 最新价格
     */
    public static function getLatestPrice(int $itemId): ?string
    {
        $transaction = MexTransaction::where('item_id', $itemId)
            ->orderBy('created_at', 'desc')
            ->first();

        return $transaction ? $transaction->price : null;
    }

    /**
     * 创建成交记录
     *
     * @param array $data 成交数据
     * @return MexTransaction|null 成交记录
     */
    public static function createTransaction(array $data): ?MexTransaction
    {
        try {
            $transaction = MexTransaction::create([
                'buy_order_id' => $data['buy_order_id'] ?? null,
                'sell_order_id' => $data['sell_order_id'] ?? null,
                'buyer_id' => $data['buyer_id'],
                'seller_id' => $data['seller_id'],
                'item_id' => $data['item_id'],
                'currency_type' => $data['currency_type'] ?? 2, // 默认使用钻石币种
                'quantity' => $data['quantity'],
                'price' => $data['price'],
                'total_amount' => $data['total_amount'],
                'transaction_type' => $data['transaction_type'],
                'is_admin_operation' => $data['is_admin_operation'] ?? false,
                'admin_user_id' => $data['admin_user_id'] ?? null,
            ]);

            // 触发成交记录创建事件
            if ($transaction) {
                event(new TransactionCreatedEvent($transaction));
            }

            return $transaction;
        } catch (\Exception $e) {
            return null;
        }
    }

    /**
     * 获取最后撮合时间信息（使用撮合日志）
     *
     * @return array 最后撮合时间信息
     */
    public static function getLastMatchTimes(): array
    {
        // 使用撮合日志服务获取最后撮合时间
        return \App\Module\Mex\Services\MexMatchLogService::getLastMatchTimes();
    }

    /**
     * 获取商品价格趋势
     *
     * @param int $itemId 商品ID
     * @param int $days 统计天数
     * @return array 价格趋势数据
     */
    public static function getItemPriceTrend(int $itemId, int $days = 7): array
    {
        $startDate = now()->subDays($days)->startOfDay();

        $transactions = MexTransaction::where('item_id', $itemId)
            ->where('created_at', '>=', $startDate)
            ->orderBy('created_at', 'asc')
            ->select('price', 'created_at')
            ->get();

        $trend = [];
        foreach ($transactions as $transaction) {
            $date = $transaction->created_at->format('Y-m-d');
            if (!isset($trend[$date])) {
                $trend[$date] = [];
            }
            $trend[$date][] = $transaction->price;
        }

        // 计算每日平均价格
        $result = [];
        foreach ($trend as $date => $prices) {
            $avgPrice = array_sum($prices) / count($prices);
            $result[] = [
                'date' => $date,
                'avg_price' => number_format($avgPrice, 5),
                'min_price' => min($prices),
                'max_price' => max($prices),
                'transaction_count' => count($prices),
            ];
        }

        return $result;
    }
}