bowling-analysis-system/src/bowling_analysis/processors/PhaseTwoProcessor.js

A comprehensive system for analyzing bowling techniques using video processing and metrics calculation

/**
 * @module bowling_analysis/processors/PhaseTwoProcessor
 * @description Process Phase Two metrics focusing on biomechanical patterns and sequences
 */

class PhaseTwoProcessor {
  /**
   * Process Phase Two metrics
   * @param {Object} data - Input data including Phase One metrics
   * @returns {Object} Phase Two metrics
   */
  async processPhaseTwo(data) {
    if (!data || !data.metrics || !data.metrics.biomechanics) {
      throw new Error('Invalid input data: missing biomechanics metrics');
    }

    const biomechanics = data.metrics.biomechanics;
    
    const metrics = {
      patterns: {
        movement: this._analyzeMovementPatterns(biomechanics),
        kinetic: this._analyzeKineticChain(biomechanics),
        technique: this._analyzeTechniquePatterns(biomechanics)
      },
      quality: {
        efficiency: this._analyzeMovementEfficiency(biomechanics),
        consistency: this._analyzeMovementConsistency(biomechanics),
        power: this._analyzePowerGeneration(biomechanics)
      },
      events: this._detectBiomechanicalEvents(biomechanics),
      metadata: {
        generatedAt: new Date().toISOString(),
        version: systemConfig.version
      }
    };

    return metrics;
  }

  /**
   * Analyze movement patterns
   * @param {Object} biomechanics - Biomechanical metrics
   * @returns {Object} Movement pattern analysis
   * @private
   */
  _analyzeMovementPatterns(biomechanics) {
    return {
      approach: this._analyzeApproachPattern(biomechanics),
      delivery: this._analyzeDeliveryPattern(biomechanics),
      followThrough: this._analyzeFollowThroughPattern(biomechanics),
      transitions: this._analyzeTransitionPatterns(biomechanics)
    };
  }

  /**
   * Analyze kinetic chain
   * @param {Object} biomechanics - Biomechanical metrics
   * @returns {Object} Kinetic chain analysis
   * @private
   */
  _analyzeKineticChain(biomechanics) {
    return {
      sequencing: this._analyzeKineticSequencing(biomechanics),
      linkages: this._analyzeKineticLinkages(biomechanics),
      transfers: this._analyzeEnergyTransfers(biomechanics),
      efficiency: this._analyzeChainEfficiency(biomechanics)
    };
  }

  /**
   * Analyze technique patterns
   * @param {Object} biomechanics - Biomechanical metrics
   * @returns {Object} Technique pattern analysis
   * @private
   */
  _analyzeTechniquePatterns(biomechanics) {
    return {
      footwork: this._analyzeFootworkPattern(biomechanics),
      armSwing: this._analyzeArmSwingPattern(biomechanics),
      release: this._analyzeReleasePattern(biomechanics),
      balance: this._analyzeBalancePattern(biomechanics)
    };
  }

  /**
   * Analyze movement efficiency
   * @param {Object} biomechanics - Biomechanical metrics
   * @returns {Object} Movement efficiency analysis
   * @private
   */
  _analyzeMovementEfficiency(biomechanics) {
    return {
      energyUsage: this._analyzeEnergyUsage(biomechanics),
      momentum: this._analyzeMomentumTransfer(biomechanics),
      stability: this._analyzeStabilityEfficiency(biomechanics),
      compensation: this._analyzeCompensationPatterns(biomechanics)
    };
  }

  /**
   * Analyze movement consistency
   * @param {Object} biomechanics - Biomechanical metrics
   * @returns {Object} Movement consistency analysis
   * @private
   */
  _analyzeMovementConsistency(biomechanics) {
    return {
      repeatability: this._analyzeRepeatability(biomechanics),
      variability: this._analyzeVariability(biomechanics),
      stability: this._analyzeStabilityConsistency(biomechanics),
      rhythm: this._analyzeMovementRhythm(biomechanics)
    };
  }

  /**
   * Analyze power generation
   * @param {Object} biomechanics - Biomechanical metrics
   * @returns {Object} Power generation analysis
   * @private
   */
  _analyzePowerGeneration(biomechanics) {
    return {
      sourceSegments: this._analyzePowerSources(biomechanics),
      transfer: this._analyzePowerTransfer(biomechanics),
      efficiency: this._analyzePowerEfficiency(biomechanics),
      timing: this._analyzePowerTiming(biomechanics)
    };
  }

  /**
   * Detect biomechanical events
   * @param {Object} biomechanics - Biomechanical metrics
   * @returns {Object} Detected events
   * @private
   */
  _detectBiomechanicalEvents(biomechanics) {
    return {
      release: this._detectReleaseEvent(biomechanics),
      footPlant: this._detectFootPlantEvent(biomechanics),
      approach: this._detectApproachEvent(biomechanics),
      transitions: this._detectTransitionEvents(biomechanics)
    };
  }

  /**
   * Detect release event
   * @param {Object} biomechanics - Biomechanical metrics
   * @returns {Object} Release event detection
   * @private
   */
  _detectReleaseEvent(biomechanics) {
    // Analyze arm position and motion
    const armPattern = this._analyzeArmPattern(biomechanics);
    
    // Analyze wrist position and motion
    const wristPattern = this._analyzeWristPattern(biomechanics);
    
    // Analyze shoulder rotation
    const shoulderPattern = this._analyzeShoulderPattern(biomechanics);
    
    // Combine patterns to detect release
    const releasePattern = this._combineReleasePatterns(armPattern, wristPattern, shoulderPattern);
    
    return {
      detected: releasePattern.isValid,
      confidence: releasePattern.confidence,
      quality: releasePattern.quality,
      characteristics: releasePattern.characteristics
    };
  }

  /**
   * Detect foot plant event
   * @param {Object} biomechanics - Biomechanical metrics
   * @returns {Object} Foot plant event detection
   * @private
   */
  _detectFootPlantEvent(biomechanics) {
    // Analyze foot position and motion
    const footPattern = this._analyzeFootPattern(biomechanics);
    
    // Analyze leg stability
    const legPattern = this._analyzeLegPattern(biomechanics);
    
    // Analyze weight transfer
    const weightPattern = this._analyzeWeightPattern(biomechanics);
    
    // Combine patterns to detect foot plant
    const plantPattern = this._combinePlantPatterns(footPattern, legPattern, weightPattern);
    
    return {
      detected: plantPattern.isValid,
      confidence: plantPattern.confidence,
      quality: plantPattern.quality,
      characteristics: plantPattern.characteristics
    };
  }

  /**
   * Detect approach event
   * @param {Object} biomechanics - Biomechanical metrics
   * @returns {Object} Approach event detection
   * @private
   */
  _detectApproachEvent(biomechanics) {
    // Analyze stride pattern
    const stridePattern = this._analyzeStridePattern(biomechanics);
    
    // Analyze body momentum
    const momentumPattern = this._analyzeMomentumPattern(biomechanics);
    
    // Analyze posture changes
    const posturePattern = this._analyzePosturePattern(biomechanics);
    
    // Combine patterns to detect approach
    const approachPattern = this._combineApproachPatterns(stridePattern, momentumPattern, posturePattern);
    
    return {
      detected: approachPattern.isValid,
      confidence: approachPattern.confidence,
      quality: approachPattern.quality,
      characteristics: approachPattern.characteristics
    };
  }

  /**
   * Detect transition events
   * @param {Object} biomechanics - Biomechanical metrics
   * @returns {Object} Transition event detection
   * @private
   */
  _detectTransitionEvents(biomechanics) {
    // Analyze movement phase changes
    const phasePattern = this._analyzePhasePattern(biomechanics);
    
    // Analyze kinetic chain transitions
    const kineticPattern = this._analyzeKineticTransitions(biomechanics);
    
    // Analyze postural transitions
    const posturalPattern = this._analyzePosturalTransitions(biomechanics);
    
    // Combine patterns to detect transitions
    const transitionPattern = this._combineTransitionPatterns(phasePattern, kineticPattern, posturalPattern);
    
    return {
      detected: transitionPattern.isValid,
      confidence: transitionPattern.confidence,
      quality: transitionPattern.quality,
      characteristics: transitionPattern.characteristics
    };
  }
}

module.exports = PhaseTwoProcessor;