Multi-pillar Negotiation Tracker

class NegotiationTracker {
  constructor(vehicleData) {
    this.vehicleData = vehicleData;
    this.initialOffer = null;
    this.counterOffers = [];
    this.tradeInValue = 0;
    this.financingOptions = [];
    this.addOns = [];
    this.totalSavings = 0;
  }

  addCounterOffer(amount, notes) {
    this.counterOffers.push({ amount, notes, timestamp: new Date() });
    this.calculateSavings();
  }

  setTradeInValue(amount) {
    this.tradeInValue = amount;
    this.calculateSavings();
  }

  calculateSavings() {
    // Calculate total potential savings across all pillars
    // ...
  }
}