All files / web/src/test/journey-simulator/reporters JsonReporter.ts

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/**
 * JSON Reporter
 *
 * Exports journey simulation results to JSON for further analysis.
 * Converts Maps to objects for JSON serialization.
 */

import * as fs from 'node:fs'
import * as path from 'node:path'
import type { ComparisonResult, JourneyResult, JourneyResultJson } from '../types'

/**
 * Convert a JourneyResult to JSON-serializable format.
 */
export function toJsonSerializable(result: JourneyResult): JourneyResultJson {
  return {
    config: {
      profileName: result.config.profile.name,
      mode: result.config.mode,
      sessionCount: result.config.sessionCount,
      sessionDurationMinutes: result.config.sessionDurationMinutes,
      seed: result.config.seed,
      practicingSkills: result.config.practicingSkills,
    },
    metrics: {
      bktCorrelation: result.finalMetrics.bktCorrelation,
      weakSkillSurfacing: result.finalMetrics.weakSkillSurfacing,
      accuracyImprovement: result.finalMetrics.accuracyImprovement,
    },
    trajectories: Object.fromEntries(result.finalMetrics.skillTrajectories),
    snapshots: result.snapshots.map((s) => ({
      session: s.sessionNumber,
      accuracy: s.accuracy,
      problemsAttempted: s.problemsAttempted,
      bktEstimates: Object.fromEntries(s.bktEstimates),
      trueSkillProbabilities: Object.fromEntries(s.trueSkillProbabilities),
      cumulativeExposures: Object.fromEntries(s.cumulativeExposures),
      sessionExposures: Object.fromEntries(s.sessionExposures),
    })),
  }
}

/**
 * Export journey results to a JSON file.
 *
 * @param result - The journey result to export
 * @param filepath - Path to write the JSON file
 */
export function exportToJson(result: JourneyResult, filepath: string): void {
  const jsonData = toJsonSerializable(result)
  const jsonString = JSON.stringify(jsonData, null, 2)

  // Ensure directory exists
  const dir = path.dirname(filepath)
  if (!fs.existsSync(dir)) {
    fs.mkdirSync(dir, { recursive: true })
  }

  fs.writeFileSync(filepath, jsonString, 'utf-8')
}

/**
 * JSON-serializable comparison result.
 */
export interface ComparisonResultJson {
  adaptive: JourneyResultJson
  classic: JourneyResultJson
  deltas: {
    bktCorrelation: number
    weakSkillSurfacing: number
    accuracyImprovement: number
  }
  winner: 'adaptive' | 'classic' | 'tie'
}

/**
 * Convert a ComparisonResult to JSON-serializable format.
 */
export function comparisonToJsonSerializable(comparison: ComparisonResult): ComparisonResultJson {
  // Determine winner
  let adaptiveWins = 0
  let classicWins = 0

  if (comparison.correlationDelta > 0.05) adaptiveWins++
  else if (comparison.correlationDelta < -0.05) classicWins++

  if (comparison.weakSkillSurfacingDelta > 0.1) adaptiveWins++
  else if (comparison.weakSkillSurfacingDelta < -0.1) classicWins++

  if (comparison.accuracyImprovementDelta > 0.02) adaptiveWins++
  else if (comparison.accuracyImprovementDelta < -0.02) classicWins++

  let winner: 'adaptive' | 'classic' | 'tie'
  if (adaptiveWins > classicWins) winner = 'adaptive'
  else if (classicWins > adaptiveWins) winner = 'classic'
  else winner = 'tie'

  return {
    adaptive: toJsonSerializable(comparison.adaptiveResult),
    classic: toJsonSerializable(comparison.classicResult),
    deltas: {
      bktCorrelation: comparison.correlationDelta,
      weakSkillSurfacing: comparison.weakSkillSurfacingDelta,
      accuracyImprovement: comparison.accuracyImprovementDelta,
    },
    winner,
  }
}

/**
 * Export comparison results to a JSON file.
 */
export function exportComparisonToJson(comparison: ComparisonResult, filepath: string): void {
  const jsonData = comparisonToJsonSerializable(comparison)
  const jsonString = JSON.stringify(jsonData, null, 2)

  // Ensure directory exists
  const dir = path.dirname(filepath)
  if (!fs.existsSync(dir)) {
    fs.mkdirSync(dir, { recursive: true })
  }

  fs.writeFileSync(filepath, jsonString, 'utf-8')
}

/**
 * Load a journey result from a JSON file.
 */
export function loadFromJson(filepath: string): JourneyResultJson {
  const jsonString = fs.readFileSync(filepath, 'utf-8')
  return JSON.parse(jsonString) as JourneyResultJson
}