import { Injectable } from '@nestjs/common';
import { ConfigService } from '@nestjs/config';
import { JsonRpcProvider, Contract } from 'ethers';
import { COMPLIANCE_ABI } from '../../contracts/abis/coupon.abi';
import { CONTRACT_ADDRESSES } from '../../contracts/addresses';

@Injectable()
export class RegulatoryService {
  private provider: JsonRpcProvider;
  private complianceContract: Contract;

  constructor(private config: ConfigService) {
    this.provider = new JsonRpcProvider(this.config.get('rpcUrl'));
    this.complianceContract = new Contract(
      CONTRACT_ADDRESSES.compliance,
      COMPLIANCE_ABI,
      this.provider,
    );
  }

  async getAddressGraph(address: string) {
    // 分析地址的资金流向关系图
    const isFrozen = await this.complianceContract.isFrozen(address).catch(() => false);
    const kycLevel = await this.complianceContract.getKYCLevel(address).catch(() => 0);

    return {
      address,
      frozen: isFrozen,
      kycLevel: Number(kycLevel),
      // 实际实现：查询链上Transfer事件构建图谱
      inbound: [],
      outbound: [],
      riskScore: isFrozen ? 100 : 0,
    };
  }

  async getTravelRuleRecords(from?: string, to?: string) {
    // 查询 Compliance 合约的 TravelRuleRecord 事件
    return { records: [], total: 0 };
  }

  async getSuspiciousTransactions() {
    // 查询 SuspiciousActivity 事件 + AI 标记
    return { transactions: [], total: 0 };
  }

  async requestFreeze(address: string, reason: string) {
    // 触发 Governance 多签冻结流程
    // 实际实现：调用 Governance.proposeFreeze()
    return {
      status: 'proposal_created',
      address,
      reason,
      proposalId: `freeze-${Date.now()}`,
      requiredApprovals: 3,
      currentApprovals: 0,
    };
  }

  async getAuditTrail(page: number, limit: number) {
    return { page, limit, total: 0, entries: [] };
  }
}
