/**
 * Base strategy class. All strategies extend this.
 * 
 * Strategies receive market state updates and emit trade signals.
 * Signals are { side: 'yes'|'no', price: number, size: number, reason: string }
 */
export class BaseStrategy {
  constructor(name, config = {}) {
    this.name = name;
    this.config = config;
    this.enabled = true;
    this.mode = 'paper'; // 'paper' | 'live'
  }

  /**
   * Called on every market state update.
   * Return a signal object or null.
   */
  evaluate(marketState) {
    throw new Error(`${this.name}: evaluate() not implemented`);
  }

  /**
   * Called when a market settles. Useful for strategies that
   * need to know outcomes (like Martingale).
   */
  onSettlement(result, tradeHistory) {
    // Override in subclass if needed
  }

  toJSON() {
    return {
      name: this.name,
      enabled: this.enabled,
      mode: this.mode,
      config: this.config
    };
  }
}