'use server';

import { db } from '@/db';
import { transactions, assets, exchangeRates } from '@/db/schema';
import Big from 'big.js';
import { asc, eq } from 'drizzle-orm';

interface Position {
  assetId: string;
  symbol: string;
  name: string | null;
  type: string;
  quantity: string;
  baseCurrency: string;
  cnyValue: string;
  totalCostCny: string;
  pnlCny: string;
  totalCostNative: string;
  pnlNative: string;
  // 新增：双重成本与盈亏指标
  totalBuyCost: string;
  totalBuyQuantity: string;
  realizedPnlCny: string;
  avgCost: string;
  dilutedCost: string;
  holdingDays: number;
  exchange: string;
  accumulatedDividendsCny: string;
  accumulatedDividendsNative: string;
  // Native 原生币种盈亏指标
  totalBuyCostNative: string;
  realizedPnlNative: string;
  avgCostNative: string;
  dilutedCostNative: string;
  marketValueNative: string;
  floatingPnlNative: string;
  floatingPnlPercent: string;
  cumulativePnlNative: string;
  cumulativePnlPercent: string;
  latestPrice: string;
  transactions: TransactionRecord[];
}

interface TransactionRecord {
  id: string;
  txType: string;
  quantity: string;
  price: string;
  fee: string;
  txCurrency: string;
  executedAt: Date | null;
}

interface RawRate {
  fromCurrency: string;
  toCurrency: string;
  rate: string;
}

function buildRateMap(rates: RawRate[]): Map<string, string> {
  const map = new Map<string, string>();
  for (const r of rates) {
    map.set(`${r.fromCurrency}_${r.toCurrency}`, r.rate);
  }
  return map;
}

function getRate(
  rateMap: Map<string, string>,
  from: string,
  to: string
): string | null {
  const direct = rateMap.get(`${from}_${to}`);
  if (direct) return direct;
  return null;
}

function calculateCnyValueFromPrice(
  quantity: Big,
  latestPrice: string,
  baseCurrency: string,
  rateMap: Map<string, string>
): Big {
  const price = new Big(latestPrice || '0');

  if (baseCurrency === 'CNY') {
    return quantity.times(price);
  }

  const directRate = getRate(rateMap, baseCurrency, 'CNY');
  if (directRate) {
    return quantity.times(price).times(new Big(directRate));
  }

  const usdToCny = getRate(rateMap, 'USD', 'CNY');
  if (!usdToCny) {
    return new Big('0');
  }

  const usdRate = getRate(rateMap, baseCurrency, 'USD');
  if (usdRate) {
    return quantity.times(price).times(new Big(usdRate)).times(new Big(usdToCny));
  }

  return new Big('0');
}

function getMarketFromExchange(exchange: string): string {
  if (!exchange) return '未知';
  const upper = exchange.toUpperCase();
  if (upper === 'SSE' || upper === 'SZSE') return 'A股';
  if (upper === 'HKEX') return '港股';
  if (upper === 'CRYPTO') return '虚拟币';
  return '美股';
}

const MARKET_COLORS: Record<string, string> = {
  'A股': '#ef4444',
  '港股': '#f59e0b',
  '美股': '#3b82f6',
  '虚拟币': '#10b981',
};

interface MarketAllocation {
  market: string;
  name: string;
  totalCnyValue: number;
  percentage: number;
  fill: string;
}

function getTodayInShanghai(): Date {
  const now = new Date();
  const utcStr = now.toLocaleString('en-US', { timeZone: 'UTC' });
  const utcDate = new Date(utcStr);
  const shanghaiOffset = 8 * 60 * 60 * 1000;
  return new Date(utcDate.getTime() + shanghaiOffset);
}

export async function getPortfolioPositions(): Promise<Position[]> {
  const allTransactions = await db
    .select({
      id: transactions.id,
      txType: transactions.txType,
      quantity: transactions.quantity,
      price: transactions.price,
      fee: transactions.fee,
      exchangeRate: transactions.exchangeRate,
      txCurrency: transactions.txCurrency,
      assetId: transactions.assetId,
      assetSymbol: assets.symbol,
      assetName: assets.name,
      assetType: assets.type,
      assetBaseCurrency: assets.baseCurrency,
      assetLatestPrice: assets.latestPrice,
      assetExchange: assets.exchange,
      executedAt: transactions.executedAt,
    })
    .from(transactions)
    .leftJoin(assets, eq(assets.id, transactions.assetId))
    .orderBy(asc(transactions.executedAt));

  const rates = await db.select({
    fromCurrency: exchangeRates.fromCurrency,
    toCurrency: exchangeRates.toCurrency,
    rate: exchangeRates.rate,
  }).from(exchangeRates);

  const rateMap = buildRateMap(rates);

  const holdings = new Map<string, {
    assetId: string;
    symbol: string;
    name: string | null;
    type: string;
    quantity: Big;
    baseCurrency: string;
    latestPrice: string;
    exchange: string;
    // 累计买入指标
    totalBuyCostCny: Big;
    totalBuyCostNative: Big;
    totalBuyQuantity: Big;
    // 已实现盈亏
    realizedPnlCny: Big;
    realizedPnlNative: Big;
    accumulatedDividendsCny: Big;
    accumulatedDividendsNative: Big;
    // 首次买入日期
    firstBuyDate: Date | null;
    // 原始流水明细
    transactions: TransactionRecord[];
  }>();

  for (const tx of allTransactions) {
    if (!tx.assetId) continue;

    const existing = holdings.get(tx.assetId);
    if (!existing) {
      holdings.set(tx.assetId, {
        assetId: tx.assetId,
        symbol: tx.assetSymbol || tx.assetId,
        name: tx.assetName,
        type: tx.assetType || 'CASH',
        quantity: new Big('0'),
        baseCurrency: tx.assetBaseCurrency || '',
        latestPrice: tx.assetLatestPrice || '0',
        exchange: tx.assetExchange || 'US',
        totalBuyCostCny: new Big('0'),
        totalBuyCostNative: new Big('0'),
        totalBuyQuantity: new Big('0'),
        realizedPnlCny: new Big('0'),
        realizedPnlNative: new Big('0'),
        accumulatedDividendsCny: new Big('0'),
        accumulatedDividendsNative: new Big('0'),
        firstBuyDate: null,
        transactions: [],
      });
    }

    const holding = holdings.get(tx.assetId)!;

    if (tx.txType === 'BUY') {
      holding.quantity = holding.quantity.plus(new Big(tx.quantity));
      const costPerUnit = new Big(tx.quantity).times(new Big(tx.price));
      holding.totalBuyCostNative = holding.totalBuyCostNative.plus(costPerUnit);
      let appliedRate = tx.exchangeRate;
      if ((!appliedRate || appliedRate === '1' || appliedRate === '1.00000000') && tx.txCurrency !== 'CNY') {
        const fallbackRate = getRate(rateMap, tx.txCurrency, 'CNY');
        if (fallbackRate) {
          appliedRate = fallbackRate;
        }
      }
      const costCny = costPerUnit.times(new Big(appliedRate || '1'));
      holding.totalBuyCostCny = holding.totalBuyCostCny.plus(costCny);
      holding.totalBuyQuantity = holding.totalBuyQuantity.plus(new Big(tx.quantity));

      // 记录首次买入日期
      if (!holding.firstBuyDate && tx.executedAt) {
        holding.firstBuyDate = new Date(tx.executedAt);
      }
    } else if (tx.txType === 'SELL') {
      // 计算卖出时的平均成本 (Native)
      let avgCostPerUnitNative = new Big('0');
      if (holding.totalBuyQuantity.gt(0)) {
        avgCostPerUnitNative = holding.totalBuyCostNative.div(holding.totalBuyQuantity);
      }

      // 已实现盈亏 = (卖出价 - 平均成本) * 卖出数量 (Native)
      const sellRevenueNative = new Big(tx.quantity).times(new Big(tx.price));
      const costBasisNative = avgCostPerUnitNative.times(new Big(tx.quantity));
      const realizedPnlNative = sellRevenueNative.minus(costBasisNative);
      holding.realizedPnlNative = holding.realizedPnlNative.plus(realizedPnlNative);

      // 已实现盈亏 (CNY) 保留兼容
      let appliedRate = tx.exchangeRate;
      if ((!appliedRate || appliedRate === '1' || appliedRate === '1.00000000') && tx.txCurrency !== 'CNY') {
        const fallbackRate = getRate(rateMap, tx.txCurrency, 'CNY');
        if (fallbackRate) {
          appliedRate = fallbackRate;
        }
      }
      const sellRevenueCny = new Big(tx.quantity).times(new Big(tx.price)).times(new Big(appliedRate || '1'));
      let avgCostPerUnitCny = new Big('0');
      if (holding.totalBuyQuantity.gt(0)) {
        avgCostPerUnitCny = holding.totalBuyCostCny.div(holding.totalBuyQuantity);
      }
      const costBasisCny = avgCostPerUnitCny.times(new Big(tx.quantity));
      const realizedPnlCny = sellRevenueCny.minus(costBasisCny);
      holding.realizedPnlCny = holding.realizedPnlCny.plus(realizedPnlCny);

      holding.quantity = holding.quantity.minus(new Big(tx.quantity));
    } else if (tx.txType === 'AIRDROP') {
      holding.quantity = holding.quantity.plus(new Big(tx.quantity));
    } else if (tx.txType === 'DIVIDEND') {
      const dividendAmountNative = new Big(tx.quantity).times(new Big(tx.price));
      const dividendCny = dividendAmountNative.times(new Big(tx.exchangeRate || '1'));
      holding.accumulatedDividendsCny = holding.accumulatedDividendsCny.plus(dividendCny);
      holding.accumulatedDividendsNative = holding.accumulatedDividendsNative.plus(dividendAmountNative);
    }

    if (tx.assetLatestPrice) {
      holding.latestPrice = tx.assetLatestPrice;
    }

    holding.transactions.push({
      id: tx.id,
      txType: tx.txType,
      quantity: tx.quantity,
      price: tx.price,
      fee: tx.fee,
      txCurrency: tx.txCurrency,
      executedAt: tx.executedAt,
    });
  }

  const today = getTodayInShanghai();
  const result: Position[] = [];

  for (const [_, holding] of holdings) {
    if (holding.quantity.lte(0)) continue;

    const cnyValue = calculateCnyValueFromPrice(
      holding.quantity,
      holding.latestPrice,
      holding.baseCurrency,
      rateMap
    );

    // 未实现盈亏 (CNY)
    const unrealizedPnlCny = cnyValue.minus(holding.totalBuyCostCny);
    // 总盈亏 (CNY)
    const totalPnlCny = unrealizedPnlCny.plus(holding.realizedPnlCny).plus(holding.accumulatedDividendsCny);

    // Native 原生币种计算
    const marketValueNative = new Big(holding.latestPrice).times(holding.quantity);
    const currentNativeValue = marketValueNative;

    // 平均成本 (Native) = 总买入成本 (Native) / 总买入数量
    let avgCostNative = new Big('0');
    if (holding.totalBuyQuantity.gt(0)) {
      avgCostNative = holding.totalBuyCostNative.div(holding.totalBuyQuantity);
    }

    // 摊薄成本 (Native) = (总买入成本 - 已实现盈亏 - 累计分红) / 当前持仓数量
    let dilutedCostNative = new Big('0');
    if (holding.quantity.gt(0)) {
      dilutedCostNative = holding.totalBuyCostNative.minus(holding.realizedPnlNative).minus(holding.accumulatedDividendsNative).div(holding.quantity);
    }

    // 浮动盈亏 (Native) = 市值 - (平均成本 * 当前持仓数量)
    const floatingPnlNative = marketValueNative.minus(avgCostNative.times(holding.quantity));

    // 浮动盈亏百分比 (Native)
    let floatingPnlPercent = new Big('0');
    const avgCostBasisNative = avgCostNative.times(holding.quantity);
    if (avgCostBasisNative.gt(0)) {
      floatingPnlPercent = floatingPnlNative.div(avgCostBasisNative).times(new Big('100'));
    }

    // 累计盈亏 (Native) = 浮动盈亏 + 已实现盈亏 + 累计分红
    const cumulativePnlNative = floatingPnlNative.plus(holding.realizedPnlNative).plus(holding.accumulatedDividendsNative);

    // 累计盈亏百分比 (Native) = 累计盈亏 / 总买入成本 * 100
    let cumulativePnlPercent = new Big('0');
    if (holding.totalBuyCostNative.gt(0)) {
      cumulativePnlPercent = cumulativePnlNative.div(holding.totalBuyCostNative).times(new Big('100'));
    }

    // 平均成本 (CNY) 保留兼容
    let avgCost = new Big('0');
    if (holding.totalBuyQuantity.gt(0)) {
      avgCost = holding.totalBuyCostCny.div(holding.totalBuyQuantity);
    }

    // 摊薄成本 (CNY) 保留兼容
    let dilutedCost = new Big('0');
    if (holding.quantity.gt(0)) {
      dilutedCost = holding.totalBuyCostCny.minus(holding.realizedPnlCny).minus(holding.accumulatedDividendsCny).div(holding.quantity);
    }

    // 持仓天数
    let holdingDays = 0;
    if (holding.firstBuyDate) {
      const diffMs = today.getTime() - holding.firstBuyDate.getTime();
      holdingDays = Math.max(0, Math.floor(diffMs / (1000 * 60 * 60 * 24)));
    }

  // Native 原生币种总盈亏 (保留兼容)
    const pnlNative = marketValueNative.minus(holding.totalBuyCostNative).plus(holding.accumulatedDividendsNative);

    result.push({
      assetId: holding.assetId,
      symbol: holding.symbol,
      name: holding.name,
      type: holding.type,
      quantity: holding.quantity.toString(),
      baseCurrency: holding.baseCurrency,
      cnyValue: cnyValue.toString(),
      totalCostCny: holding.totalBuyCostCny.toString(),
      pnlCny: totalPnlCny.toString(),
      totalCostNative: holding.totalBuyCostNative.toString(),
      pnlNative: pnlNative.toString(),
      totalBuyCost: holding.totalBuyCostCny.toString(),
      totalBuyQuantity: holding.totalBuyQuantity.toString(),
      realizedPnlCny: holding.realizedPnlCny.toString(),
      avgCost: avgCost.toString(),
      dilutedCost: dilutedCost.toString(),
      holdingDays,
      exchange: holding.exchange,
      accumulatedDividendsCny: holding.accumulatedDividendsCny.toString(),
      accumulatedDividendsNative: holding.accumulatedDividendsNative.toString(),
      // Native 原生币种盈亏指标
      totalBuyCostNative: holding.totalBuyCostNative.toString(),
      realizedPnlNative: holding.realizedPnlNative.toString(),
      avgCostNative: avgCostNative.toString(),
      dilutedCostNative: dilutedCostNative.toString(),
      marketValueNative: marketValueNative.toString(),
      floatingPnlNative: floatingPnlNative.toString(),
      floatingPnlPercent: floatingPnlPercent.toString(),
      cumulativePnlNative: cumulativePnlNative.toString(),
      cumulativePnlPercent: cumulativePnlPercent.toString(),
      latestPrice: holding.latestPrice,
      transactions: holding.transactions,
    });
  }

  return result;
}

export async function getPortfolioSummary() {
  const positions = await getPortfolioPositions();

  const totalCnyValue = positions.reduce(
    (sum, pos) => sum.plus(new Big(pos.cnyValue)),
    new Big('0')
  );

  const totalPnlCny = positions.reduce(
    (sum, pos) => sum.plus(new Big(pos.pnlCny)),
    new Big('0')
  );

  const unrealizedPnlCny = positions.reduce(
    (sum, pos) => {
      const totalPnl = new Big(pos.pnlCny);
      const realized = new Big(pos.realizedPnlCny);
      return sum.plus(totalPnl.minus(realized));
    },
    new Big('0')
  );

  const chartData = positions.map((pos, index) => ({
    name: pos.symbol,
    value: new Big(pos.cnyValue).toNumber(),
    fill: [
      '#3b82f6',
      '#8b5cf6',
      '#10b981',
      '#f59e0b',
      '#ef4444',
      '#06b6d4',
    ][index % 6],
  }));

  // 按市场维度聚合资产分布
  const marketMap = new Map<string, {
    market: string;
    totalCnyValue: Big;
  }>();

  for (const pos of positions) {
    const market = getMarketFromExchange(pos.exchange);
    const existing = marketMap.get(market);
    if (existing) {
      existing.totalCnyValue = existing.totalCnyValue.plus(new Big(pos.cnyValue));
    } else {
      marketMap.set(market, {
        market,
        totalCnyValue: new Big(pos.cnyValue),
      });
    }
  }

  const marketAllocation: MarketAllocation[] = [];
  let grandTotal = new Big('0');
  for (const [, data] of marketMap) {
    grandTotal = grandTotal.plus(data.totalCnyValue);
  }

  for (const [, data] of marketMap) {
    const percentage = grandTotal.gt(0)
      ? data.totalCnyValue.div(grandTotal).times(100)
      : new Big('0');
    marketAllocation.push({
      market: data.market,
      name: data.market,
      totalCnyValue: Number(data.totalCnyValue.toString()),
      percentage: Number(percentage.toString()),
      fill: MARKET_COLORS[data.market] || '#6b7280',
    });
  }

  marketAllocation.sort((a, b) => b.totalCnyValue - a.totalCnyValue);

  return {
    positions,
    totalCnyValue: totalCnyValue.toString(),
    totalPnlCny: totalPnlCny.toString(),
    unrealizedPnlCny: unrealizedPnlCny.toString(),
    chartData,
    marketAllocation,
  };
}