<?php

namespace App\Module\Mex\Logic;

use App\Module\Fund\Enums\FUND_CURRENCY_TYPE;
use App\Module\Mex\Dto\MexDailyPriceTrendDto;
use App\Module\Mex\Models\MexDailyPriceTrend;
use App\Module\Mex\Models\MexTransaction;
use Carbon\Carbon;
use Illuminate\Support\Collection;


/**
 * 农贸市场每日价格趋势逻辑层
 */
class MexDailyPriceTrendLogic
{
    /**
     * 生成指定日期的价格趋势数据
     */
    public function generateDailyTrend(string $date, int $itemId, FUND_CURRENCY_TYPE $currencyType): ?MexDailyPriceTrendDto
    {
        $startDate = Carbon::parse($date)->startOfDay();
        $endDate = Carbon::parse($date)->endOfDay();

        // 获取当日所有成交记录
        $transactions = MexTransaction::where('item_id', $itemId)
            ->where('currency_type', $currencyType)
            ->whereBetween('created_at', [$startDate, $endDate])
            ->orderBy('created_at')
            ->get();

        if ($transactions->isEmpty()) {
            // 没有成交记录时，使用前一日数据或价格配置数据生成趋势记录
            return $this->generateTrendFromPreviousOrConfig($date, $itemId, $currencyType);
        }

        // 计算价格统计
        $priceStats = $this->calculatePriceStatistics($transactions);

        // 计算买入卖出价格统计
        $buyPriceStats = $this->calculateBuyPriceStatistics($transactions);
        $sellPriceStats = $this->calculateSellPriceStatistics($transactions);

        // 计算交易统计
        $tradeStats = $this->calculateTradeStatistics($transactions);
        
        // 获取前一日收盘价用于计算价格变化
        $previousClosePrice = $this->getPreviousClosePrice($date, $itemId, $currencyType);
        
        // 计算价格变化
        $priceChange = $this->calculatePriceChange($priceStats['close_price'], $previousClosePrice);

        // 创建或更新趋势记录
        $trend = MexDailyPriceTrend::updateOrCreate(
            [
                'item_id' => $itemId,
                'currency_type' => $currencyType,
                'trade_date' => $date,
            ],
            array_merge($priceStats, $buyPriceStats, $sellPriceStats, $tradeStats, $priceChange)
        );

        return MexDailyPriceTrendDto::fromModel($trend);
    }

    /**
     * 批量生成多日价格趋势数据
     */
    public function generateMultipleDaysTrends(
        string $startDate,
        string $endDate,
        ?int $itemId = null,
        ?FUND_CURRENCY_TYPE $currencyType = null
    ): Collection {
        $results = collect();
        $current = Carbon::parse($startDate);
        $end = Carbon::parse($endDate);

        while ($current <= $end) {
            $dateStr = $current->format('Y-m-d');
            
            if ($itemId && $currencyType) {
                // 生成指定商品的趋势
                $trend = $this->generateDailyTrend($dateStr, $itemId, $currencyType);
                if ($trend) {
                    $results->push($trend);
                }
            } else {
                // 生成所有商品的趋势
                $this->generateAllItemsTrendsForDate($dateStr, $results);
            }
            
            $current->addDay();
        }

        return $results;
    }

    /**
     * 获取商品的价格趋势历史
     */
    public function getItemPriceTrends(
        int $itemId,
        FUND_CURRENCY_TYPE $currencyType,
        string $startDate,
        string $endDate,
        int $limit = 100
    ): Collection {
        $trends = MexDailyPriceTrend::where('item_id', $itemId)
            ->where('currency_type', $currencyType)
            ->whereBetween('trade_date', [$startDate, $endDate])
            ->orderBy('trade_date', 'desc')
            ->limit($limit)
            ->get();

        return $trends->map(fn($trend) => MexDailyPriceTrendDto::fromModel($trend));
    }

    /**
     * 获取价格趋势统计信息
     */
    public function getTrendStatistics(
        int $itemId,
        FUND_CURRENCY_TYPE $currencyType,
        string $startDate,
        string $endDate
    ): array {
        $trends = MexDailyPriceTrend::where('item_id', $itemId)
            ->where('currency_type', $currencyType)
            ->whereBetween('trade_date', [$startDate, $endDate])
            ->get();

        if ($trends->isEmpty()) {
            return [];
        }

        return [
            'period_start' => $startDate,
            'period_end' => $endDate,
            'trading_days' => $trends->count(),
            'total_volume' => $trends->sum('total_volume'),
            'total_amount' => $trends->sum('total_amount'),
            'avg_daily_volume' => $trends->avg('total_volume'),
            'avg_daily_amount' => $trends->avg('total_amount'),
            'highest_price' => $trends->max('high_price'),
            'lowest_price' => $trends->min('low_price'),
            'period_start_price' => $trends->sortBy('trade_date')->first()->open_price,
            'period_end_price' => $trends->sortByDesc('trade_date')->first()->close_price,
            'avg_volatility' => $trends->avg('volatility'),
            'max_volatility' => $trends->max('volatility'),
        ];
    }

    /**
     * 计算价格统计
     */
    private function calculatePriceStatistics(Collection $transactions): array
    {
        $prices = $transactions->pluck('price');

        // 计算加权平均价格
        $totalAmount = $transactions->sum('total_amount');
        $totalQuantity = $transactions->sum('quantity');
        $avgPrice = $totalQuantity > 0 ? $totalAmount / $totalQuantity : 0;

        $openPrice = $transactions->first()->price;
        $closePrice = $transactions->last()->price;
        $highPrice = $prices->max();
        $lowPrice = $prices->min();

        // 计算波动率
        $volatility = $openPrice > 0 ? (($highPrice - $lowPrice) / $openPrice * 100) : 0;

        return [
            'open_price' => $openPrice,
            'close_price' => $closePrice,
            'high_price' => $highPrice,
            'low_price' => $lowPrice,
            'avg_price' => $avgPrice,
            'volatility' => $volatility,
        ];
    }

    /**
     * 计算交易统计
     */
    private function calculateTradeStatistics(Collection $transactions): array
    {
        $totalVolume = $transactions->sum('quantity');
        $totalAmount = $transactions->sum('total_amount');
        $transactionCount = $transactions->count();

        // 按交易类型分组统计
        $userBuyTransactions = $transactions->where('transaction_type', 'USER_BUY');
        $userSellTransactions = $transactions->where('transaction_type', 'USER_SELL');
        $adminInjectTransactions = $transactions->where('transaction_type', 'ADMIN_INJECT');
        $adminRecycleTransactions = $transactions->where('transaction_type', 'ADMIN_RECYCLE');

        return [
            'total_volume' => $totalVolume,
            'total_amount' => $totalAmount,
            'transaction_count' => $transactionCount,
            'buy_volume' => $userBuyTransactions->sum('quantity'),
            'sell_volume' => $userSellTransactions->sum('quantity'),
            'buy_amount' => $userBuyTransactions->sum('total_amount'),
            'sell_amount' => $userSellTransactions->sum('total_amount'),
            'admin_inject_volume' => $adminInjectTransactions->sum('quantity'),
            'admin_recycle_volume' => $adminRecycleTransactions->sum('quantity'),
            'admin_inject_amount' => $adminInjectTransactions->sum('total_amount'),
            'admin_recycle_amount' => $adminRecycleTransactions->sum('total_amount'),
        ];
    }

    /**
     * 获取前一日收盘价
     */
    private function getPreviousClosePrice(string $date, int $itemId, FUND_CURRENCY_TYPE $currencyType): ?float
    {
        $previousDate = Carbon::parse($date)->subDay()->format('Y-m-d');

        $previousTrend = MexDailyPriceTrend::where('item_id', $itemId)
            ->where('currency_type', $currencyType)
            ->where('trade_date', $previousDate)
            ->first();

        return $previousTrend?->close_price;
    }

    /**
     * 计算价格变化
     */
    private function calculatePriceChange(float $currentPrice, ?float $previousPrice): array
    {
        if ($previousPrice === null || $previousPrice == 0) {
            return [
                'price_change' => null,
                'price_change_percent' => null,
            ];
        }

        $priceChange = $currentPrice - $previousPrice;
        $priceChangePercent = ($priceChange / $previousPrice) * 100;

        return [
            'price_change' => $priceChange,
            'price_change_percent' => $priceChangePercent,
        ];
    }

    /**
     * 生成指定日期所有商品的趋势数据
     */
    private function generateAllItemsTrendsForDate(string $date, Collection &$results): void
    {
        // 获取当日有交易的所有商品和币种组合
        $itemCurrencyPairs = MexTransaction::whereDate('created_at', $date)
            ->select('item_id', 'currency_type')
            ->distinct()
            ->get();

        foreach ($itemCurrencyPairs as $pair) {
            $trend = $this->generateDailyTrend($date, $pair->item_id, $pair->currency_type);
            if ($trend) {
                $results->push($trend);
            }
        }
    }

    /**
     * 从前一日数据或价格配置生成趋势记录
     */
    private function generateTrendFromPreviousOrConfig(string $date, int $itemId, FUND_CURRENCY_TYPE $currencyType): ?MexDailyPriceTrendDto
    {
        // 获取前一日收盘价
        $previousClosePrice = $this->getPreviousClosePrice($date, $itemId, $currencyType);

        if ($previousClosePrice !== null) {
            // 使用前一日收盘价作为当日所有价格
            $priceData = [
                'open_price' => $previousClosePrice,
                'close_price' => $previousClosePrice,
                'high_price' => $previousClosePrice,
                'low_price' => $previousClosePrice,
                'avg_price' => $previousClosePrice,
                'buy_open_price' => $previousClosePrice,
                'buy_close_price' => $previousClosePrice,
                'buy_high_price' => $previousClosePrice,
                'buy_low_price' => $previousClosePrice,
                'buy_avg_price' => $previousClosePrice,
                'sell_open_price' => $previousClosePrice,
                'sell_close_price' => $previousClosePrice,
                'sell_high_price' => $previousClosePrice,
                'sell_low_price' => $previousClosePrice,
                'sell_avg_price' => $previousClosePrice,
            ];
        } else {
            // 使用价格配置数据
            $priceConfig = \App\Module\Mex\Logic\MexPriceConfigLogic::getItemPriceConfig($itemId);
            if (!$priceConfig) {
                return null; // 没有价格配置，无法生成趋势
            }

            // 使用价格配置的中间价作为参考价格
            $referencePrice = ($priceConfig['min_price'] + $priceConfig['max_price']) / 2;

            $priceData = [
                'open_price' => $referencePrice,
                'close_price' => $referencePrice,
                'high_price' => $referencePrice,
                'low_price' => $referencePrice,
                'avg_price' => $referencePrice,
                'buy_open_price' => $referencePrice,
                'buy_close_price' => $referencePrice,
                'buy_high_price' => $referencePrice,
                'buy_low_price' => $referencePrice,
                'buy_avg_price' => $referencePrice,
                'sell_open_price' => $referencePrice,
                'sell_close_price' => $referencePrice,
                'sell_high_price' => $referencePrice,
                'sell_low_price' => $referencePrice,
                'sell_avg_price' => $referencePrice,
            ];
        }

        // 无成交时的统计数据
        $statsData = [
            'total_volume' => 0,
            'total_amount' => 0,
            'transaction_count' => 0,
            'buy_volume' => 0,
            'sell_volume' => 0,
            'buy_amount' => 0,
            'sell_amount' => 0,
            'admin_inject_volume' => 0,
            'admin_recycle_volume' => 0,
            'admin_inject_amount' => 0,
            'admin_recycle_amount' => 0,
            'volatility' => 0,
        ];

        // 计算价格变化
        $priceChange = $this->calculatePriceChange($priceData['close_price'], $previousClosePrice);

        // 创建或更新趋势记录
        $trend = MexDailyPriceTrend::updateOrCreate(
            [
                'item_id' => $itemId,
                'currency_type' => $currencyType,
                'trade_date' => $date,
            ],
            array_merge($priceData, $statsData, $priceChange)
        );

        return MexDailyPriceTrendDto::fromModel($trend);
    }

    /**
     * 计算买入价格统计
     */
    private function calculateBuyPriceStatistics(Collection $transactions): array
    {
        // 筛选买入交易
        $buyTransactions = $transactions->where('transaction_type', 'USER_BUY');

        if ($buyTransactions->isEmpty()) {
            return [
                'buy_open_price' => null,
                'buy_close_price' => null,
                'buy_high_price' => null,
                'buy_low_price' => null,
                'buy_avg_price' => null,
            ];
        }

        $buyPrices = $buyTransactions->pluck('price');

        // 计算买入加权平均价格
        $buyTotalAmount = $buyTransactions->sum('total_amount');
        $buyTotalQuantity = $buyTransactions->sum('quantity');
        $buyAvgPrice = $buyTotalQuantity > 0 ? $buyTotalAmount / $buyTotalQuantity : 0;

        return [
            'buy_open_price' => $buyTransactions->first()->price,
            'buy_close_price' => $buyTransactions->last()->price,
            'buy_high_price' => $buyPrices->max(),
            'buy_low_price' => $buyPrices->min(),
            'buy_avg_price' => $buyAvgPrice,
        ];
    }

    /**
     * 计算卖出价格统计
     */
    private function calculateSellPriceStatistics(Collection $transactions): array
    {
        // 筛选卖出交易
        $sellTransactions = $transactions->where('transaction_type', 'USER_SELL');

        if ($sellTransactions->isEmpty()) {
            return [
                'sell_open_price' => null,
                'sell_close_price' => null,
                'sell_high_price' => null,
                'sell_low_price' => null,
                'sell_avg_price' => null,
            ];
        }

        $sellPrices = $sellTransactions->pluck('price');

        // 计算卖出加权平均价格
        $sellTotalAmount = $sellTransactions->sum('total_amount');
        $sellTotalQuantity = $sellTransactions->sum('quantity');
        $sellAvgPrice = $sellTotalQuantity > 0 ? $sellTotalAmount / $sellTotalQuantity : 0;

        return [
            'sell_open_price' => $sellTransactions->first()->price,
            'sell_close_price' => $sellTransactions->last()->price,
            'sell_high_price' => $sellPrices->max(),
            'sell_low_price' => $sellPrices->min(),
            'sell_avg_price' => $sellAvgPrice,
        ];
    }
}