import axios from 'axios'
import { OraclePackage } from '../../typings'

export interface OracleRecord {
  oraclePackage: OraclePackage
  latestRate: string
  rateDelta: string
  indexValueRay: string
  rateTimestamp: number
}

export interface OracleAPIConfig {
  oracleServiceUrl: string | string[]
}

export class OracleAPI {
  private readonly config: OracleAPIConfig
  constructor(config: OracleAPIConfig) {
    this.config = config
  }

  public async getRates() {
    const oracleUrls = typeof this.config.oracleServiceUrl === 'string'
      ? [this.config.oracleServiceUrl]
      : this.config.oracleServiceUrl

    let oracleRecords: OracleRecord[] = []
    for(const oracleUrl of oracleUrls) {
      const {
        data: records
      } = await axios.get<OracleRecord[]>(`${oracleUrl}/records`)
      oracleRecords.push(...records)
    }

    return oracleRecords
  }

  public async getOraclePackages() {
    const rates = await this.getRates()
    return rates.map(item => item.oraclePackage)
  }

  public async getMarketOraclePackage(marketId: string) {
    const rates = await this.getRates()
    const marketRate = rates.find(item => item.oraclePackage.marketId === marketId)
    if(marketRate) {
      return marketRate.oraclePackage
    }
    throw new Error(`Failed to get oracle package for market ${marketId}`)
  }
}