import { BaseStrategy } from './base.js';
import crypto from 'crypto';

/**
 * Martingale Alpha Strategy
 *
 * When odds are between 40-60% for both sides (a ~coin-flip market):
 * - Use crypto.randomInt to pick yes/no
 * - Round 1: bet $1, Round 2: bet $2, Round 3: bet $4
 * - If any round wins, reset to round 1
 * - If all 3 lose, reset to round 1 anyway (cap losses at $7 per cycle)
 *
 * Probability of losing 3 consecutive 50/50s = 12.5%
 * Probability of winning at least 1 of 3 = 87.5%
 */
export class MartingaleAlphaStrategy extends BaseStrategy {
  constructor(config = {}) {
    super('martingale-alpha', {
      minPct: config.minPct || 40,
      maxPct: config.maxPct || 60,
      baseBet: config.baseBet || 1,
      maxRounds: config.maxRounds || 3,
      slippage: config.slippage || 3,
      cooldownMs: config.cooldownMs || 20000,
      ...config
    });

    this.round = 0;
    this.currentBetSize = this.config.baseBet;
    this.cycleWins = 0;
    this.cycleLosses = 0;
    this.totalCycles = 0;

    this._lastTrade = {
      paper: { time: 0, ticker: null },
      live: { time: 0, ticker: null }
    };
  }

  evaluate(state, caller = 'paper') {
    if (!state || !this.enabled) return null;

    const track = this._lastTrade[caller] || this._lastTrade.paper;
    const now = Date.now();
    if (now - track.time < this.config.cooldownMs) return null;
    if (state.ticker === track.ticker) return null;

    const { yesPct, noPct } = state;
    const { minPct, maxPct } = this.config;

    if (yesPct < minPct || yesPct > maxPct) return null;
    if (noPct < minPct || noPct > maxPct) return null;

    const flip = crypto.randomInt(0, 2);
    const side = flip === 0 ? 'yes' : 'no';
    const price = side === 'yes' ? yesPct : noPct;
    const maxPrice = Math.min(price + this.config.slippage, 95);

    const roundIndex = this.round;
    const betSize = this.config.baseBet * Math.pow(2, roundIndex);

    const signal = {
      strategy: this.name,
      side,
      price,
      maxPrice,
      size: betSize,
      reason: `R${roundIndex + 1}/${this.config.maxRounds} coin-flip ${side.toUpperCase()} @ ${price}¢ ($${betSize}) | Market: ${yesPct}/${noPct}`,
      ticker: state.ticker
    };

    track.time = now;
    track.ticker = state.ticker;
    this.currentBetSize = betSize;

    return signal;
  }

  onSettlement(result, trade) {
    if (!trade || trade.strategy !== this.name) return;

    const won = trade.side === result;

    if (won) {
      console.log(`[MartingaleAlpha] WIN on round ${this.round + 1} — cycle complete, resetting`);
      this.cycleWins++;
      this.totalCycles++;
      this._resetCycle();
    } else {
      this.round++;
      if (this.round >= this.config.maxRounds) {
        console.log(`[MartingaleAlpha] LOST all ${this.config.maxRounds} rounds — cycle failed, resetting`);
        this.cycleLosses++;
        this.totalCycles++;
        this._resetCycle();
      } else {
        const nextBet = this.config.baseBet * Math.pow(2, this.round);
        console.log(`[MartingaleAlpha] LOSS round ${this.round}/${this.config.maxRounds} — next bet: $${nextBet}`);
        this.currentBetSize = nextBet;
      }
    }
  }

  _resetCycle() {
    this.round = 0;
    this.currentBetSize = this.config.baseBet;
    // Reset both callers' ticker locks so new cycle can trade same market
    this._lastTrade.paper.ticker = null;
    this._lastTrade.live.ticker = null;
  }

  toJSON() {
    return {
      ...super.toJSON(),
      round: this.round + 1,
      maxRounds: this.config.maxRounds,
      currentBetSize: this.currentBetSize,
      cycleWins: this.cycleWins,
      cycleLosses: this.cycleLosses,
      totalCycles: this.totalCycles,
      cycleWinRate: this.totalCycles > 0
        ? parseFloat(((this.cycleWins / this.totalCycles) * 100).toFixed(1))
        : 0
    };
  }
}