/**
 * Bridge Reserve Service
 * Backend service coordinating bridge operations with ReserveSystem
 */

import { ethers } from 'ethers';

export interface PegStatus {
  asset: string;
  currentPrice: string;
  targetPrice: string;
  deviationBps: number;
  isMaintained: boolean;
}

export interface ReserveStatus {
  asset: string;
  bridgeAmount: string;
  reserveBalance: string;
  reserveRatio: number;
  isSufficient: boolean;
  lastVerified: number;
}

export class BridgeReserveService {
  private provider: ethers.Provider;
  private bridgeReserveCoordinator: ethers.Contract;
  private stablecoinPegManager: ethers.Contract;
  private commodityPegManager: ethers.Contract;

  constructor(
    provider: ethers.Provider,
    bridgeReserveCoordinatorAddress: string,
    stablecoinPegManagerAddress: string,
    commodityPegManagerAddress: string
  ) {
    this.provider = provider;
    
    // Initialize contracts (ABIs would be imported from contract artifacts)
    this.bridgeReserveCoordinator = new ethers.Contract(
      bridgeReserveCoordinatorAddress,
      [], // ABI would go here
      provider
    );
    
    this.stablecoinPegManager = new ethers.Contract(
      stablecoinPegManagerAddress,
      [], // ABI would go here
      provider
    );
    
    this.commodityPegManager = new ethers.Contract(
      commodityPegManagerAddress,
      [], // ABI would go here
      provider
    );
  }

  /**
   * Get current peg status for all assets
   */
  async getPegStatus(): Promise<PegStatus[]> {
    try {
      // Call verifyPegStatus on BridgeReserveCoordinator
      const pegStatuses = await this.bridgeReserveCoordinator.verifyPegStatus();
      
      return pegStatuses.map((status: any) => ({
        asset: status.asset,
        currentPrice: status.currentPrice.toString(),
        targetPrice: status.targetPrice.toString(),
        deviationBps: Number(status.deviationBps),
        isMaintained: status.isMaintained,
      }));
    } catch (error) {
      console.error('Error getting peg status:', error);
      throw error;
    }
  }

  /**
   * Verify reserve backing for an asset
   */
  async verifyReserve(asset: string, bridgeAmount: string): Promise<ReserveStatus> {
    try {
      const status = await this.bridgeReserveCoordinator.getReserveStatus(
        asset,
        bridgeAmount
      );
      
      return {
        asset: status.asset,
        bridgeAmount: status.bridgeAmount.toString(),
        reserveBalance: status.reserveBalance.toString(),
        reserveRatio: Number(status.reserveRatio),
        isSufficient: status.isSufficient,
        lastVerified: Number(status.lastVerified),
      };
    } catch (error) {
      console.error('Error verifying reserve:', error);
      throw error;
    }
  }

  /**
   * Trigger rebalancing for an asset
   */
  async triggerRebalancing(asset: string, amount: string, signer: ethers.Signer): Promise<string> {
    try {
      const contractWithSigner = this.bridgeReserveCoordinator.connect(signer);
      const tx = await contractWithSigner.triggerRebalancing(asset, amount);
      await tx.wait();
      return tx.hash;
    } catch (error) {
      console.error('Error triggering rebalancing:', error);
      throw error;
    }
  }

  /**
   * Get reserve balances for all assets
   */
  async getReserves(): Promise<Record<string, string>> {
    // In production, this would query ReserveSystem for all reserve balances
    return {};
  }

  /**
   * Monitor peg status and trigger rebalancing if needed
   */
  async monitorAndRebalance(signer: ethers.Signer): Promise<void> {
    const pegStatuses = await this.getPegStatus();
    
    for (const status of pegStatuses) {
      if (!status.isMaintained) {
        console.warn(`Peg deviation detected for ${status.asset}: ${status.deviationBps} bps`);
        // In production, you might want to trigger rebalancing automatically
        // or alert administrators
      }
    }
  }
}

export default BridgeReserveService;

