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

/**
 * [BIZ_FIN_23] 跨主权多资产实时结算网关 (MultiAssetSettlementService)
 * @description 在自治贸易生态中，通过 AGI 自动执行跨主权的多币种、多资产（如法定货币、数字资产、仓储提单资产）的实时清算与结算，支持主权级的资产主权保护。
 */
export class MultiAssetSettlementService {
  private static readonly SETTLEMENT_TABLE = 'cf_multi_asset_settlement';

  /**
   * 初始化数据库表
   */
  static async initTable() {
    const hasTable = await db.schema.hasTable(this.SETTLEMENT_TABLE);
    if (!hasTable) {
      logger.info(`📦 Creating ${this.SETTLEMENT_TABLE} table...`);
      await db.schema.createTable(this.SETTLEMENT_TABLE, (table) => {
        table.increments('id').primary();
        table.string('sender_tenant_id', 64).notNullable();
        table.string('receiver_tenant_id', 64).notNullable();
        table.string('asset_type', 32).notNullable(); // FIAT_USD, FIAT_CNY, DIGITAL_ASSET, WAREHOUSE_RECEIPT
        table.decimal('asset_amount', 20, 2).notNullable(); // 结算金额
        table.decimal('settlement_exchange_rate', 15, 4); // 结算时的汇率
        table.string('status', 32).defaultTo('PENDING'); // PENDING, PROCESSING, SETTLED, FAILED
        table.dateTime('settled_at'); // 结算完成时间
        table.string('settlement_tx_hash', 255); // 结算流水哈希 (e.g., Blockchain TX or Bank Ref)
        table.json('settlement_logic'); // { fee_deduction, conversion_path, sovereign_compliance_check }
        table.string('trace_id', 128);
        table.timestamps(true, true);
        table.index(['sender_tenant_id', 'status']);
      });
      logger.info(`✅ Table ${this.SETTLEMENT_TABLE} created`);
    }
  }

  /**
   * 执行跨主权资产结算
   * @param senderTenantId 发送租户 ID
   * @param receiverTenantId 接收租户 ID
   * @param assetType 资产类型
   * @param amount 结算金额
   * @param traceId 调用链 ID
   */
  static async executeMultiAssetSettlement(
    senderTenantId: string,
    receiverTenantId: string,
    assetType: string,
    amount: number,
    traceId: string
  ): Promise<boolean> {
    if (!(await FeatureGovernanceService.isEnabled('BIZ_FIN_MULTI_ASSET_SETTLEMENT', senderTenantId))) {
      return false;
    }

    logger.info(`[MultiAssetSettlement] Processing settlement for Sender ${senderTenantId} to Receiver ${receiverTenantId} | asset: ${assetType} | amount: ${amount} | traceId: ${traceId}`);

    // 1. 获取 AGI 驱动的“清算路径优化” (模拟逻辑)
    // 基于 AGI 实时汇率预测、合规路径、费率模型生成最优清算路径
    const prompt = `Generate optimal clearing path for ${assetType} settlement of ${amount} between ${senderTenantId} and ${receiverTenantId}`;
    const clearingStrategy = await AIService.generateStrategy(prompt, traceId);

    // 2. 解析 AGI 决策结果 (模拟解析逻辑)
    // 假设 AGI 返回：RATE:7.2345,TX_HASH:0xABC123...
    const settlementRate = clearingStrategy.includes('RATE:') ? parseFloat(clearingStrategy.split('RATE:')[1].split(',')[0]) : 7.2345;
    const txHash = clearingStrategy.includes('TX_HASH:') ? clearingStrategy.split('TX_HASH:')[1].split(',')[0] : 'TX-' + Math.random().toString(36).substring(7).toUpperCase();

    // 3. 持久化结算记录
    await db(this.SETTLEMENT_TABLE).insert({
      sender_tenant_id: senderTenantId,
      receiver_tenant_id: receiverTenantId,
      asset_type: assetType,
      asset_amount: amount,
      settlement_exchange_rate: settlementRate,
      status: 'SETTLED',
      settled_at: new Date(),
      settlement_tx_hash: txHash,
      settlement_logic: JSON.stringify({
        fee_deduction: '0.05%',
        conversion_path: 'DIRECT',
        sovereign_compliance_check: 'PASSED'
      }),
      trace_id: traceId,
      created_at: new Date(),
      updated_at: new Date()
    });

    logger.info(`[MultiAssetSettlement] Multi-asset settlement executed successfully for Sender ${senderTenantId} | TX: ${txHash} | traceId: ${traceId}`);
    
    // 4. 联动主权财务系统 (模拟)
    // TODO: 调用 SovereigntySettlementService 执行最终资产下发

    return true;
  }

  /**
   * 模拟主权资产余额检查
   */
  static async checkSovereignBalance(tenantId: string, assetType: string): Promise<number> {
    // 模拟：根据租户 ID 获取主权资产余额
    return 1000000.00;
  }
}
