export interface PricingConfig {
  evalFeeSats?: number;
  workFeeShortSats?: number;
  workFeeMediumSats?: number;
  workFeeLongSats?: number;
  shortMaxChars?: number;
  mediumMaxChars?: number;
  bootstrapFeeSats?: number;
}

export class PricingService {
  private readonly evalFee: number;
  private readonly workFeeShort: number;
  private readonly workFeeMedium: number;
  private readonly workFeeLong: number;
  private readonly shortMax: number;
  private readonly mediumMax: number;
  private readonly bootstrapFee: number;

  constructor(config?: PricingConfig) {
    this.evalFee = config?.evalFeeSats ?? 10;
    this.workFeeShort = config?.workFeeShortSats ?? 50;
    this.workFeeMedium = config?.workFeeMediumSats ?? 100;
    this.workFeeLong = config?.workFeeLongSats ?? 250;
    this.shortMax = config?.shortMaxChars ?? 100;
    this.mediumMax = config?.mediumMaxChars ?? 300;
    const rawFee = parseInt(process.env.BOOTSTRAP_FEE_SATS ?? "", 10);
    this.bootstrapFee =
      config?.bootstrapFeeSats ??
      (Number.isFinite(rawFee) && rawFee > 0 ? rawFee : 10_000);
  }

  calculateEvalFeeSats(): number {
    return this.evalFee;
  }

  calculateWorkFeeSats(requestText: string): number {
    const len = requestText.trim().length;
    if (len <= this.shortMax) return this.workFeeShort;
    if (len <= this.mediumMax) return this.workFeeMedium;
    return this.workFeeLong;
  }

  calculateBootstrapFeeSats(): number {
    return this.bootstrapFee;
  }
}

export const pricingService = new PricingService();