trading_bot_v4/lib/trading/signal-quality.ts

/**
 * Signal Quality Scoring
 * 
 * Unified quality scoring logic used by both check-risk and execute endpoints.
 * Ensures consistent scoring across the trading pipeline.
 */

export interface SignalQualityResult {
  score: number
  passed: boolean
  reasons: string[]
}

/**
 * Calculate signal quality score based on technical indicators
 * 
 * Scoring breakdown:
 * - Base: 50 points
 * - ATR (volatility): -20 to +10 points
 * - ADX (trend strength): -15 to +15 points
 * - RSI (momentum): -10 to +10 points
 * - Volume: -10 to +15 points
 * - Price position: -15 to +5 points
 * - Volume breakout bonus: +10 points
 * 
 * Total range: ~15-115 points (realistically 30-100)
 * Threshold: 60 points minimum for execution
 */
export function scoreSignalQuality(params: {
  atr: number
  adx: number
  rsi: number
  volumeRatio: number
  pricePosition: number
  direction: 'long' | 'short'
  minScore?: number // Configurable minimum score threshold
}): SignalQualityResult {
  let score = 50 // Base score
  const reasons: string[] = []

  // ATR check (volatility gate: 0.15% - 2.5%)
  if (params.atr > 0) {
    if (params.atr < 0.15) {
      score -= 15
      reasons.push(`ATR too low (${params.atr.toFixed(2)}% - dead market)`)
    } else if (params.atr > 2.5) {
      score -= 20
      reasons.push(`ATR too high (${params.atr.toFixed(2)}% - too volatile)`)
    } else if (params.atr >= 0.15 && params.atr < 0.4) {
      score += 5
      reasons.push(`ATR moderate (${params.atr.toFixed(2)}%)`)
    } else {
      score += 10
      reasons.push(`ATR healthy (${params.atr.toFixed(2)}%)`)
    }
  }

  // ADX check (trend strength: want >18)
  if (params.adx > 0) {
    if (params.adx > 25) {
      score += 15
      reasons.push(`Strong trend (ADX ${params.adx.toFixed(1)})`)
    } else if (params.adx < 18) {
      score -= 15
      reasons.push(`Weak trend (ADX ${params.adx.toFixed(1)})`)
    } else {
      score += 5
      reasons.push(`Moderate trend (ADX ${params.adx.toFixed(1)})`)
    }
  }

  // RSI check (momentum confirmation)
  if (params.rsi > 0) {
    if (params.direction === 'long') {
      if (params.rsi > 50 && params.rsi < 70) {
        score += 10
        reasons.push(`RSI supports long (${params.rsi.toFixed(1)})`)
      } else if (params.rsi > 70) {
        score -= 10
        reasons.push(`RSI overbought (${params.rsi.toFixed(1)})`)
      }
    } else { // short
      if (params.rsi < 50 && params.rsi > 30) {
        score += 10
        reasons.push(`RSI supports short (${params.rsi.toFixed(1)})`)
      } else if (params.rsi < 30) {
        score -= 10
        reasons.push(`RSI oversold (${params.rsi.toFixed(1)})`)
      }
    }
  }

  // Volume check (want > 1.0 = above average)
  if (params.volumeRatio > 0) {
    if (params.volumeRatio > 1.5) {
      score += 15
      reasons.push(`Very strong volume (${params.volumeRatio.toFixed(2)}x avg)`)
    } else if (params.volumeRatio > 1.2) {
      score += 10
      reasons.push(`Strong volume (${params.volumeRatio.toFixed(2)}x avg)`)
    } else if (params.volumeRatio < 0.8) {
      score -= 10
      reasons.push(`Weak volume (${params.volumeRatio.toFixed(2)}x avg)`)
    }
  }

  // Price position check (avoid chasing vs breakout detection)
  if (params.pricePosition > 0) {
    if (params.direction === 'long' && params.pricePosition > 95) {
      // High volume breakout at range top can be good
      if (params.volumeRatio > 1.4) {
        score += 5
        reasons.push(`Volume breakout at range top (${params.pricePosition.toFixed(0)}%, vol ${params.volumeRatio.toFixed(2)}x)`)
      } else {
        score -= 15
        reasons.push(`Price near top of range (${params.pricePosition.toFixed(0)}%) - risky long`)
      }
    } else if (params.direction === 'short' && params.pricePosition < 5) {
      // High volume breakdown at range bottom can be good
      if (params.volumeRatio > 1.4) {
        score += 5
        reasons.push(`Volume breakdown at range bottom (${params.pricePosition.toFixed(0)}%, vol ${params.volumeRatio.toFixed(2)}x)`)
      } else {
        score -= 15
        reasons.push(`Price near bottom of range (${params.pricePosition.toFixed(0)}%) - risky short`)
      }
    } else {
      score += 5
      reasons.push(`Price position OK (${params.pricePosition.toFixed(0)}%)`)
    }
  }

  // Volume breakout bonus (high volume can override other weaknesses)
  if (params.volumeRatio > 1.8 && params.atr < 0.6) {
    score += 10
    reasons.push(`Volume breakout compensates for low ATR`)
  }

  const minScore = params.minScore || 60
  const passed = score >= minScore

  return {
    score,
    passed,
    reasons,
  }
}