/**
 * Market Reporting Service
 * Aggregates and reports bridge metrics to crypto and FX markets via APIs
 */

import axios, { AxiosInstance } from 'axios';

export interface MarketMetrics {
  timestamp: number;
  volume24h: number;
  liquidity: number;
  activeClaims: number;
  totalBridged: number;
  pegStatus: {
    usdt: { price: number; deviation: number };
    usdc: { price: number; deviation: number };
    weth: { price: number; deviation: number };
  };
}

export interface CryptoPriceReport {
  symbol: string;
  price: number;
  volume24h: number;
  timestamp: number;
}

export interface FXRateReport {
  pair: string; // e.g., "USD/EUR"
  rate: number;
  timestamp: number;
}

export class MarketReportingService {
  private cryptoApis: Map<string, AxiosInstance>;
  private fxApis: Map<string, AxiosInstance>;
  private reportingInterval: NodeJS.Timeout | null = null;
  private isReporting: boolean = false;

  // API configurations
  private binanceApi: AxiosInstance;
  private coinbaseApi: AxiosInstance;
  private krakenApi: AxiosInstance;
  private fxcmApi: AxiosInstance | null = null;
  private alphaVantageApi: AxiosInstance | null = null;

  constructor() {
    // Initialize crypto APIs
    this.binanceApi = axios.create({
      baseURL: 'https://api.binance.com/api/v3',
      timeout: 10000,
    });

    this.coinbaseApi = axios.create({
      baseURL: 'https://api.coinbase.com/v2',
      timeout: 10000,
    });

    this.krakenApi = axios.create({
      baseURL: 'https://api.kraken.com/0/public',
      timeout: 10000,
    });

    this.cryptoApis = new Map([
      ['binance', this.binanceApi],
      ['coinbase', this.coinbaseApi],
      ['kraken', this.krakenApi],
    ]);

    // Initialize FX APIs (if API keys available)
    if (process.env.FXCM_API_KEY) {
      this.fxcmApi = axios.create({
        baseURL: 'https://api.fxcm.com',
        headers: {
          'Authorization': `Bearer ${process.env.FXCM_API_KEY}`,
        },
        timeout: 10000,
      });
    }

    if (process.env.ALPHA_VANTAGE_API_KEY) {
      this.alphaVantageApi = axios.create({
        baseURL: 'https://www.alphavantage.co/query',
        params: {
          apikey: process.env.ALPHA_VANTAGE_API_KEY,
        },
        timeout: 10000,
      });
    }

    this.fxApis = new Map();
    if (this.fxcmApi) this.fxApis.set('fxcm', this.fxcmApi);
    if (this.alphaVantageApi) this.fxApis.set('alphavantage', this.alphaVantageApi);
  }

  /**
   * Report price to crypto exchanges
   */
  async reportCryptoPrice(report: CryptoPriceReport): Promise<void> {
    const promises: Promise<void>[] = [];

    // Report to Binance (if they accept external price feeds)
    promises.push(this.reportToBinance(report).catch(err => {
      console.error('Failed to report to Binance:', err.message);
    }));

    // Report to Coinbase (if they accept external price feeds)
    promises.push(this.reportToCoinbase(report).catch(err => {
      console.error('Failed to report to Coinbase:', err.message);
    }));

    // Report to Kraken (if they accept external price feeds)
    promises.push(this.reportToKraken(report).catch(err => {
      console.error('Failed to report to Kraken:', err.message);
    }));

    await Promise.allSettled(promises);
  }

  /**
   * Report FX rate to FX markets
   */
  async reportFXRate(report: FXRateReport): Promise<void> {
    const promises: Promise<void>[] = [];

    if (this.fxcmApi) {
      promises.push(this.reportToFXCM(report).catch(err => {
        console.error('Failed to report to FXCM:', err.message);
      }));
    }

    if (this.alphaVantageApi) {
      promises.push(this.reportToAlphaVantage(report).catch(err => {
        console.error('Failed to report to Alpha Vantage:', err.message);
      }));
    }

    await Promise.allSettled(promises);
  }

  /**
   * Get aggregated metrics
   */
  async getMetrics(): Promise<MarketMetrics> {
    // In production, this would query the bridge contracts and aggregate data
    return {
      timestamp: Date.now(),
      volume24h: 0,
      liquidity: 0,
      activeClaims: 0,
      totalBridged: 0,
      pegStatus: {
        usdt: { price: 1.0, deviation: 0 },
        usdc: { price: 1.0, deviation: 0 },
        weth: { price: 1.0, deviation: 0 },
      },
    };
  }

  /**
   * Get historical data
   */
  async getHistory(startTime: number, endTime: number): Promise<MarketMetrics[]> {
    // In production, this would query historical data from a database
    return [];
  }

  /**
   * Start periodic reporting
   */
  startReporting(intervalMs: number = 60000): void {
    if (this.reportingInterval) {
      this.stopReporting();
    }

    this.reportingInterval = setInterval(async () => {
      if (this.isReporting) return;
      this.isReporting = true;

      try {
        const metrics = await this.getMetrics();
        
        // Report crypto prices
        await this.reportCryptoPrice({
          symbol: 'USDT',
          price: metrics.pegStatus.usdt.price,
          volume24h: metrics.volume24h,
          timestamp: metrics.timestamp,
        });

        // Report FX rates (example: USD/EUR)
        await this.reportFXRate({
          pair: 'USD/EUR',
          rate: 0.9, // Example rate
          timestamp: metrics.timestamp,
        });
      } catch (error) {
        console.error('Error in periodic reporting:', error);
      } finally {
        this.isReporting = false;
      }
    }, intervalMs);
  }

  /**
   * Stop periodic reporting
   */
  stopReporting(): void {
    if (this.reportingInterval) {
      clearInterval(this.reportingInterval);
      this.reportingInterval = null;
    }
  }

  // Private helper methods for specific API integrations

  private async reportToBinance(report: CryptoPriceReport): Promise<void> {
    // Note: Binance doesn't typically accept external price feeds
    // This is a placeholder for if/when they provide such an API
    // In practice, you might publish to a data aggregator that Binance monitors
    console.log('Reporting to Binance:', report);
  }

  private async reportToCoinbase(report: CryptoPriceReport): Promise<void> {
    // Note: Coinbase doesn't typically accept external price feeds
    // This is a placeholder for if/when they provide such an API
    console.log('Reporting to Coinbase:', report);
  }

  private async reportToKraken(report: CryptoPriceReport): Promise<void> {
    // Note: Kraken doesn't typically accept external price feeds
    // This is a placeholder for if/when they provide such an API
    console.log('Reporting to Kraken:', report);
  }

  private async reportToFXCM(report: FXRateReport): Promise<void> {
    if (!this.fxcmApi) return;
    
    // FXCM API endpoint for reporting rates (placeholder)
    // In practice, you'd use their actual API endpoint
    console.log('Reporting to FXCM:', report);
  }

  private async reportToAlphaVantage(report: FXRateReport): Promise<void> {
    if (!this.alphaVantageApi) return;
    
    // Alpha Vantage API endpoint for reporting rates (placeholder)
    // In practice, you'd use their actual API endpoint
    console.log('Reporting to Alpha Vantage:', report);
  }
}

export default MarketReportingService;

