import db from '../config/database';
import { logger } from '../utils/logger';
import { AIService } from './AIService';
import { FeatureGovernanceService } from '../core/governance/FeatureGovernanceService';

/**
 * [BIZ_FIN_22] 跨主权流动性自动对冲策略 (LiquidityHedgingService)
 * @description 在自治贸易生态中，通过 AGI 实时监控不同国家和地区的汇率、利率与通胀波动，自动执行跨主权的流动性对冲与资产重组。
 */
export class LiquidityHedgingService {
  private static readonly HEDGING_TABLE = 'cf_liquidity_hedging';

  /**
   * 初始化数据库表
   */
  static async initTable() {
    const hasTable = await db.schema.hasTable(this.HEDGING_TABLE);
    if (!hasTable) {
      logger.info(`📦 Creating ${this.HEDGING_TABLE} table...`);
      await db.schema.createTable(this.HEDGING_TABLE, (table) => {
        table.increments('id').primary();
        table.string('tenant_id', 64).notNullable();
        table.string('asset_pair', 32).notNullable(); // e.g., 'USD/CNY', 'EUR/USD'
        table.decimal('hedged_amount', 20, 2).notNullable(); // 对冲金额
        table.decimal('strike_price', 15, 4); // 行权价/锁定汇率
        table.string('strategy_type', 64).notNullable(); // SPOT, FORWARD, OPTION, SWAP
        table.string('status', 32).defaultTo('ACTIVE'); // ACTIVE, EXECUTED, CANCELLED
        table.dateTime('expiry_date'); // 到期日
        table.json('risk_exposure'); // { currency_risk, interest_risk, geopolitical_risk }
        table.string('trace_id', 128);
        table.timestamps(true, true);
        table.index(['tenant_id', 'status']);
      });
      logger.info(`✅ Table ${this.HEDGING_TABLE} created`);
    }
  }

  /**
   * 自动对冲资产流动性风险
   * @param tenantId 租户 ID
   * @param assetPair 资产对
   * @param exposureAmount 风险敞口金额
   * @param traceId 调用链 ID
   */
  static async executeHedgingStrategy(
    tenantId: string,
    assetPair: string,
    exposureAmount: number,
    traceId: string
  ): Promise<boolean> {
    // 1. 功能开关检查
    if (!(await FeatureGovernanceService.isEnabled('BIZ_FIN_LIQUIDITY_HEDGING', tenantId))) {
      logger.warn(`[LiquidityHedging] Service disabled for tenant ${tenantId} | traceId: ${traceId}`);
      return false;
    }

    logger.info(`[LiquidityHedging] Executing liquidity hedging for tenant ${tenantId} | asset: ${assetPair} | exposure: ${exposureAmount} | traceId: ${traceId}`);

    // 2. 获取当前资产对的市场波动与 AGI 预测结果
    // 模拟市场预测数据获取
    const marketData = await AIService.analyzeSecurityRisk(`Analyze market risk for ${assetPair} with exposure: ${exposureAmount}`, traceId);
    
    // 3. 调用 AGI “对冲策略引擎” 生成最优策略
    const prompt = `Generate optimal hedging strategy for ${assetPair} with ${exposureAmount} exposure based on market analysis: ${marketData}`;
    const strategyResponse = await AIService.generateStrategy(prompt, traceId);

    // 4. 解析 AGI 决策结果 (模拟解析逻辑)
    // 假设 AGI 返回格式：STRATEGY:FORWARD,PRICE:7.25,EXPIRY:2026-06-30
    const strategyType = strategyResponse.includes('FORWARD') ? 'FORWARD' : 'OPTION';
    const strikePrice = strategyResponse.includes('PRICE:') ? parseFloat(strategyResponse.split('PRICE:')[1].split(',')[0]) : 7.2345;
    const expiryDate = new Date();
    expiryDate.setMonth(expiryDate.getMonth() + 3); // 默认 3 个月后到期

    // 5. 持久化对冲策略
    await db(this.HEDGING_TABLE).insert({
      tenant_id: tenantId,
      asset_pair: assetPair,
      hedged_amount: exposureAmount,
      strike_price: strikePrice,
      strategy_type: strategyType,
      status: 'ACTIVE',
      expiry_date: expiryDate,
      risk_exposure: JSON.stringify({
        currency_risk: 'MEDIUM',
        interest_risk: 'LOW',
        geopolitical_risk: 'STABLE'
      }),
      trace_id: traceId,
      created_at: new Date(),
      updated_at: new Date()
    });

    logger.info(`[LiquidityHedging] Hedging strategy executed successfully for tenant ${tenantId} | strategy: ${strategyType} | traceId: ${traceId}`);
    
    // 6. 联动执行对冲指令 (模拟调用支付与结算系统)
    // TODO: 调用 SovereigntySettlementService 执行资金锁定

    return true;
  }

  /**
   * 自动监控并更新对冲状态
   */
  static async monitorHedges(traceId: string) {
    const activeHedges = await db(this.HEDGING_TABLE).where({ status: 'ACTIVE' });
    const now = new Date();

    for (const hedge of activeHedges) {
      if (new Date(hedge.expiry_date) <= now) {
        logger.info(`[LiquidityHedging] Hedge ID ${hedge.id} expired, executing settlement... | traceId: ${traceId}`);
        
        await db(this.HEDGING_TABLE)
          .where({ id: hedge.id })
          .update({
            status: 'EXECUTED',
            updated_at: new Date()
          });
      }
    }
  }
}
