/**
 * 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
 * 
 * TIMEFRAME-AWARE SCORING:
 * 5min charts naturally have lower ADX/ATR than higher timeframes
 * 
 * Scoring breakdown:
 * - Base: 50 points
 * - ATR (volatility): -20 to +10 points (5min: 0.25-0.7% is healthy)
 * - ADX (trend strength): -15 to +15 points (5min: 15+ is trending)
 * - RSI (momentum): -10 to +10 points
 * - Volume: -10 to +15 points
 * - Price position: -15 to +5 points
 * - Volume breakout bonus: +10 points
 * - Anti-chop filter: -20 points (5min only, extreme chop)
 * 
 * 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
  timeframe?: string // e.g., '5', '15', '60', '1D'
}): SignalQualityResult {
  let score = 50 // Base score
  const reasons: string[] = []
  
  // Detect 5-minute timeframe
  const is5min = params.timeframe === '5' || params.timeframe === 'manual'

  // ATR check - TIMEFRAME AWARE
  if (params.atr > 0) {
    if (is5min) {
      // 5min: lower thresholds, more lenient
      if (params.atr < 0.2) {
        score -= 15
        reasons.push(`ATR too low (${params.atr.toFixed(2)}% - dead market)`)
      } else if (params.atr > 1.5) {
        score -= 20
        reasons.push(`ATR too high (${params.atr.toFixed(2)}% - too volatile)`)
      } else if (params.atr >= 0.2 && params.atr < 0.35) {
        score += 5
        reasons.push(`ATR acceptable (${params.atr.toFixed(2)}%)`)
      } else {
        score += 10
        reasons.push(`ATR healthy (${params.atr.toFixed(2)}%)`)
      }
    } else {
      // Higher timeframes: stricter requirements
      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 - TIMEFRAME AWARE
  if (params.adx > 0) {
    if (is5min) {
      // 5min: ADX 15+ is actually trending, 20+ is strong
      // High volume can compensate for lower ADX in breakouts/breakdowns
      const hasStrongVolume = params.volumeRatio > 1.2
      
      if (params.adx > 22) {
        score += 15
        reasons.push(`Strong 5min trend (ADX ${params.adx.toFixed(1)})`)
      } else if (params.adx < 12) {
        // Reduce penalty if strong volume present (breakdown/breakout in progress)
        if (hasStrongVolume) {
          score -= 5
          reasons.push(`Lower 5min ADX (${params.adx.toFixed(1)}) but strong volume compensates`)
        } else {
          score -= 15
          reasons.push(`Weak 5min trend (ADX ${params.adx.toFixed(1)})`)
        }
      } else {
        score += 5
        reasons.push(`Moderate 5min trend (ADX ${params.adx.toFixed(1)})`)
      }
    } else {
      // Higher timeframes: stricter ADX requirements
      const hasStrongVolume = params.volumeRatio > 1.2
      
      if (params.adx > 25) {
        score += 15
        reasons.push(`Strong trend (ADX ${params.adx.toFixed(1)})`)
      } else if (params.adx < 18) {
        // Reduce penalty if strong volume present
        if (hasStrongVolume) {
          score -= 5
          reasons.push(`Lower ADX (${params.adx.toFixed(1)}) but strong volume compensates`)
        } else {
          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/breakdown 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
      // Also allow if RSI is bearish (< 40) - breakdowns continue lower
      if (params.volumeRatio > 1.2 || (params.rsi > 0 && params.rsi < 40)) {
        score += 5
        reasons.push(`Valid breakdown at range bottom (${params.pricePosition.toFixed(0)}%, vol ${params.volumeRatio.toFixed(2)}x, RSI ${params.rsi.toFixed(1)})`)
      } else {
        score -= 10
        reasons.push(`Price near bottom of range (${params.pricePosition.toFixed(0)}%) - reduced penalty for short`)
      }
    } else if (params.direction === 'long' && params.pricePosition < 5) {
      // Longs at bottom with good volume = potential reversal
      if (params.volumeRatio > 1.2 || (params.rsi > 0 && params.rsi > 60)) {
        score += 5
        reasons.push(`Potential reversal at bottom (${params.pricePosition.toFixed(0)}%, vol ${params.volumeRatio.toFixed(2)}x, RSI ${params.rsi.toFixed(1)})`)
      } else {
        score -= 10
        reasons.push(`Price near bottom (${params.pricePosition.toFixed(0)}%) - reduced penalty for reversal long`)
      }
    } 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`)
  }
  
  // ANTI-CHOP FILTER for 5min (extreme penalty for sideways chop)
  if (is5min && params.adx < 10 && params.atr < 0.25 && params.volumeRatio < 0.9) {
    score -= 20
    reasons.push(`⛔ Extreme chop detected (ADX ${params.adx.toFixed(1)}, ATR ${params.atr.toFixed(2)}%, Vol ${params.volumeRatio.toFixed(2)}x)`)
  }

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

  return {
    score,
    passed,
    reasons,
  }
}