# VFS User Functions - Templates and Examples

This document provides template functions that you can implement for domain-specific needs. These functions combine VFS primitives to solve common problems.

## Table of Contents
1. [Code Analysis Functions](#code-analysis-functions)
2. [Export Format Functions](#export-format-functions)
3. [Project Management Functions](#project-management-functions)
4. [Creative Writing Functions](#creative-writing-functions)
5. [Game Development Functions](#game-development-functions)

## Code Analysis Functions

### Get Dependency Graph
```javascript
/**
 * Build a dependency graph for JavaScript/TypeScript projects
 */
async function getDependencyGraph(vfs, srcPath) {
  const files = await vfs.readdir(srcPath, { recursive: true })
  const graph = {}

  for (const file of files) {
    const filePath = `${srcPath}/${file}`

    // Only process JS/TS files
    if (file.match(/\.(js|ts|jsx|tsx)$/)) {
      const content = await vfs.readFile(filePath)
      const text = content.toString()

      // Parse imports (basic regex, use proper AST parser for production)
      const imports = []
      const importRegex = /import\s+.*?\s+from\s+['"](.+?)['"]/g
      const requireRegex = /require\(['"](.+?)['"]\)/g

      let match
      while ((match = importRegex.exec(text)) !== null) {
        imports.push(match[1])
      }
      while ((match = requireRegex.exec(text)) !== null) {
        imports.push(match[1])
      }

      graph[filePath] = imports
    }
  }

  return graph
}

// Use it
const deps = await getDependencyGraph(vfs, '/src')
```

### Find Circular Dependencies
```javascript
/**
 * Detect circular dependencies in your code
 */
async function findCircularDependencies(vfs, srcPath) {
  const graph = await getDependencyGraph(vfs, srcPath)
  const cycles = []

  function detectCycle(node, visited = new Set(), stack = []) {
    if (stack.includes(node)) {
      const cycleStart = stack.indexOf(node)
      cycles.push(stack.slice(cycleStart))
      return
    }

    if (visited.has(node)) return
    visited.add(node)
    stack.push(node)

    const dependencies = graph[node] || []
    for (const dep of dependencies) {
      // Resolve relative imports
      const resolvedDep = resolvePath(node, dep)
      if (graph[resolvedDep]) {
        detectCycle(resolvedDep, visited, [...stack])
      }
    }
  }

  Object.keys(graph).forEach(node => detectCycle(node))
  return cycles
}
```

### Find Untested Code
```javascript
/**
 * Find source files without corresponding test files
 */
async function findUntestedCode(vfs, srcPath, testPath = null) {
  testPath = testPath || srcPath.replace('/src', '/tests')

  const sourceFiles = await vfs.readdir(srcPath, { recursive: true })
  const testFiles = await vfs.readdir(testPath, { recursive: true }).catch(() => [])

  const untestedFiles = []

  for (const sourceFile of sourceFiles) {
    if (!sourceFile.match(/\.(js|ts|jsx|tsx)$/)) continue

    // Look for corresponding test file
    const baseName = sourceFile.replace(/\.(js|ts|jsx|tsx)$/, '')
    const hasTest = testFiles.some(testFile =>
      testFile.includes(baseName) &&
      testFile.match(/\.(test|spec)\.(js|ts|jsx|tsx)$/)
    )

    if (!hasTest) {
      untestedFiles.push(`${srcPath}/${sourceFile}`)
    }
  }

  return untestedFiles
}
```

### Find Similar Code (Duplicate Detection)
```javascript
/**
 * Find potentially duplicate code using similarity scoring
 */
async function findSimilarCode(vfs, filePath, options = {}) {
  const threshold = options.threshold || 0.8
  const searchPath = options.searchPath || '/'

  // Get the reference file content
  const referenceContent = await vfs.readFile(filePath)
  const referenceText = referenceContent.toString()

  // Use VFS's semantic search
  const similar = await vfs.findSimilar(filePath, {
    limit: 10,
    threshold
  })

  // Additionally, do structural comparison
  const results = []
  for (const match of similar) {
    const matchContent = await vfs.readFile(match.path)
    const matchText = matchContent.toString()

    // Simple line-based similarity (use better algorithms in production)
    const similarity = calculateSimilarity(referenceText, matchText)

    if (similarity > threshold) {
      results.push({
        path: match.path,
        similarity,
        semanticScore: match.score
      })
    }
  }

  return results.sort((a, b) => b.similarity - a.similarity)
}

function calculateSimilarity(text1, text2) {
  // Simple Jaccard similarity on lines
  const lines1 = new Set(text1.split('\n').map(l => l.trim()).filter(l => l))
  const lines2 = new Set(text2.split('\n').map(l => l.trim()).filter(l => l))

  const intersection = new Set([...lines1].filter(x => lines2.has(x)))
  const union = new Set([...lines1, ...lines2])

  return intersection.size / union.size
}
```

## Export Format Functions

### Export to EPUB (for novels)
```javascript
/**
 * Export a directory of markdown files to EPUB format
 */
async function exportToEpub(vfs, path, metadata = {}) {
  // First get the markdown export
  const markdown = await vfs.exportToMarkdown(path)

  // You'll need an EPUB library like epub-gen
  const Epub = require('epub-gen')

  // Convert markdown chapters to EPUB format
  const chapters = []
  const files = await vfs.readdir(path, { recursive: true })

  for (const file of files.sort()) {
    if (file.endsWith('.md')) {
      const content = await vfs.readFile(`${path}/${file}`)
      const title = file.replace('.md', '').replace(/-/g, ' ')

      chapters.push({
        title: title,
        data: content.toString()
      })
    }
  }

  const options = {
    title: metadata.title || 'My Book',
    author: metadata.author || 'Author',
    chapters: chapters
  }

  return new Epub(options)
}
```

### Export to Static Site
```javascript
/**
 * Export VFS content to static HTML site
 */
async function exportToStaticSite(vfs, sourcePath, options = {}) {
  const json = await vfs.exportToJSON(sourcePath)
  const html = []

  html.push('<!DOCTYPE html>')
  html.push('<html><head>')
  html.push(`<title>${options.title || 'Documentation'}</title>`)
  html.push('<style>/* Add your styles */</style>')
  html.push('</head><body>')

  function renderNode(node, name, depth = 0) {
    const indent = '  '.repeat(depth)

    if (node._meta?.type === 'file') {
      html.push(`${indent}<article>`)
      html.push(`${indent}  <h${Math.min(depth + 2, 6)}>${name}</h${Math.min(depth + 2, 6)}>`)

      if (typeof node._content === 'string') {
        // Convert markdown to HTML if needed
        html.push(`${indent}  <pre>${escapeHtml(node._content)}</pre>`)
      }

      html.push(`${indent}</article>`)
    } else if (node._meta?.type === 'directory') {
      html.push(`${indent}<section>`)
      html.push(`${indent}  <h${Math.min(depth + 1, 6)}>${name}</h${Math.min(depth + 1, 6)}>`)

      for (const [childName, childNode] of Object.entries(node)) {
        if (!childName.startsWith('_')) {
          renderNode(childNode, childName, depth + 1)
        }
      }

      html.push(`${indent}</section>`)
    }
  }

  renderNode(json, options.title || 'Root')

  html.push('</body></html>')
  return html.join('\n')
}
```

### Export to GraphQL Schema
```javascript
/**
 * Generate GraphQL schema from VFS entities
 */
async function exportToGraphQLSchema(vfs) {
  const entities = await vfs.listEntities()
  const types = new Map()

  // Group entities by type
  for (const entity of entities) {
    const type = entity.type || 'Unknown'
    if (!types.has(type)) {
      types.set(type, [])
    }
    types.get(type).push(entity)
  }

  // Generate schema
  let schema = 'type Query {\n'

  for (const [typeName, entities] of types) {
    schema += `  get${typeName}(id: ID!): ${typeName}\n`
    schema += `  list${typeName}s: [${typeName}!]!\n`
  }

  schema += '}\n\n'

  // Generate types
  for (const [typeName, entities] of types) {
    schema += `type ${typeName} {\n`
    schema += '  id: ID!\n'

    // Infer fields from first entity
    if (entities.length > 0) {
      const sample = entities[0]
      for (const [key, value] of Object.entries(sample)) {
        if (key !== 'id') {
          const fieldType = inferGraphQLType(value)
          schema += `  ${key}: ${fieldType}\n`
        }
      }
    }

    schema += '}\n\n'
  }

  return schema
}
```

## Project Management Functions

### Get Project Insights
```javascript
/**
 * Analyze project for insights and patterns
 */
async function getProjectInsights(vfs, projectPath) {
  const stats = await vfs.getProjectStats(projectPath)
  const todos = await vfs.getAllTodos(projectPath)
  const timeline = await vfs.getTimeline({ limit: 100 })

  // Analyze activity patterns
  const activityByDay = {}
  const activityByUser = {}
  const activityByFile = {}

  for (const event of timeline) {
    const day = event.timestamp.toISOString().split('T')[0]
    activityByDay[day] = (activityByDay[day] || 0) + 1

    const user = event.user || 'system'
    activityByUser[user] = (activityByUser[user] || 0) + 1

    activityByFile[event.path] = (activityByFile[event.path] || 0) + 1
  }

  // Find hotspots (most edited files)
  const hotspots = Object.entries(activityByFile)
    .sort(([,a], [,b]) => b - a)
    .slice(0, 10)
    .map(([path, count]) => ({ path, edits: count }))

  // Todo analysis
  const todosByPriority = {}
  const todosByStatus = {}

  for (const todo of todos) {
    todosByPriority[todo.priority] = (todosByPriority[todo.priority] || 0) + 1
    todosByStatus[todo.status] = (todosByStatus[todo.status] || 0) + 1
  }

  return {
    stats,
    activity: {
      byDay: activityByDay,
      byUser: activityByUser,
      hotspots
    },
    todos: {
      total: todos.length,
      byPriority: todosByPriority,
      byStatus: todosByStatus,
      highPriority: todos.filter(t => t.priority === 'high' && t.status === 'pending')
    },
    recommendations: generateRecommendations(stats, todos, hotspots)
  }
}

function generateRecommendations(stats, todos, hotspots) {
  const recommendations = []

  if (stats.largestFile && stats.largestFile.size > 1024 * 1024) {
    recommendations.push({
      type: 'refactor',
      message: `Consider splitting ${stats.largestFile.path} (${Math.round(stats.largestFile.size / 1024)}KB)`
    })
  }

  if (todos.filter(t => t.priority === 'high' && t.status === 'pending').length > 5) {
    recommendations.push({
      type: 'priority',
      message: 'You have many high-priority pending todos'
    })
  }

  if (hotspots.length > 0 && hotspots[0].edits > 50) {
    recommendations.push({
      type: 'stability',
      message: `${hotspots[0].path} changes frequently, consider stabilizing`
    })
  }

  return recommendations
}
```

### Generate Sprint Report
```javascript
/**
 * Generate a report for the current sprint
 */
async function generateSprintReport(vfs, sprintStart, sprintEnd = new Date()) {
  const timeline = await vfs.getTimeline({
    from: sprintStart,
    to: sprintEnd
  })

  const todos = await vfs.getAllTodos()

  // Group work by user
  const workByUser = {}
  for (const event of timeline) {
    const user = event.user || 'system'
    if (!workByUser[user]) {
      workByUser[user] = {
        commits: 0,
        filesModified: new Set(),
        linesChanged: 0
      }
    }

    workByUser[user].commits++
    workByUser[user].filesModified.add(event.path)
  }

  // Calculate completion rate
  const completedTodos = todos.filter(t => t.status === 'completed').length
  const totalTodos = todos.length
  const completionRate = totalTodos > 0 ? (completedTodos / totalTodos * 100).toFixed(1) : 0

  return {
    period: {
      start: sprintStart,
      end: sprintEnd,
      days: Math.ceil((sprintEnd - sprintStart) / (1000 * 60 * 60 * 24))
    },
    team: Object.entries(workByUser).map(([user, work]) => ({
      user,
      commits: work.commits,
      filesModified: work.filesModified.size
    })),
    todos: {
      completed: completedTodos,
      total: totalTodos,
      completionRate: `${completionRate}%`,
      remaining: todos.filter(t => t.status === 'pending')
    },
    velocity: {
      commitsPerDay: (timeline.length / 7).toFixed(1),
      todosPerDay: (completedTodos / 7).toFixed(1)
    }
  }
}
```

## Creative Writing Functions

### Track Character Arcs
```javascript
/**
 * Track how characters evolve throughout a story
 */
async function trackCharacterArc(vfs, characterName, storyPath = '/') {
  // Find the character entity
  const entities = await vfs.searchEntities({
    type: 'character',
    name: characterName
  })

  if (entities.length === 0) {
    throw new Error(`Character ${characterName} not found`)
  }

  const character = entities[0]
  const occurrences = await vfs.findEntityOccurrences(character.id)

  // Analyze each appearance
  const arc = []

  for (const occurrence of occurrences) {
    const content = await vfs.readFile(occurrence.path)
    const text = content.toString()

    // Find mentions of the character (basic approach)
    const mentions = text.split('\n').filter(line =>
      line.toLowerCase().includes(characterName.toLowerCase())
    )

    arc.push({
      chapter: occurrence.path,
      mentions: mentions.length,
      // Analyze emotional tone (simplified)
      mood: analyzeMood(mentions),
      // Extract key actions
      actions: extractActions(mentions, characterName)
    })
  }

  return {
    character: character.metadata,
    arc: arc,
    summary: summarizeArc(arc)
  }
}

function analyzeMood(mentions) {
  const positiveWords = ['smiled', 'laughed', 'happy', 'joy', 'love', 'success']
  const negativeWords = ['cried', 'angry', 'sad', 'fear', 'fail', 'death']

  let positive = 0, negative = 0

  for (const mention of mentions) {
    const lower = mention.toLowerCase()
    positive += positiveWords.filter(w => lower.includes(w)).length
    negative += negativeWords.filter(w => lower.includes(w)).length
  }

  if (positive > negative) return 'positive'
  if (negative > positive) return 'negative'
  return 'neutral'
}
```

### Generate Story Bible
```javascript
/**
 * Create a comprehensive reference for your story universe
 */
async function generateStoryBible(vfs, storyPath) {
  const characters = await vfs.listEntities({ type: 'character' })
  const locations = await vfs.listEntities({ type: 'location' })
  const concepts = await vfs.findConcepts({ domain: 'narrative' })

  const bible = {
    title: 'Story Bible',
    generated: new Date(),
    characters: {},
    locations: {},
    plotThreads: {},
    timeline: []
  }

  // Document characters
  for (const char of characters) {
    const occurrences = await vfs.findEntityOccurrences(char.id)
    bible.characters[char.metadata.name] = {
      ...char.metadata,
      appearances: occurrences.map(o => o.path),
      relationships: await vfs.getEntityGraph(char.id, { depth: 1 })
    }
  }

  // Document locations
  for (const loc of locations) {
    bible.locations[loc.metadata.name] = {
      ...loc.metadata,
      scenes: await vfs.findEntityOccurrences(loc.id)
    }
  }

  // Plot threads from concepts
  for (const concept of concepts) {
    if (concept.type === 'plot') {
      bible.plotThreads[concept.name] = {
        description: concept.description,
        keywords: concept.keywords,
        chapters: await vfs.findByConcept(concept.name)
      }
    }
  }

  // Generate timeline
  const events = await vfs.getTimeline({ limit: 1000 })
  bible.timeline = events.map(e => ({
    date: e.timestamp,
    event: e.description,
    chapter: e.path
  }))

  return bible
}
```

## Game Development Functions

### Validate Game Data
```javascript
/**
 * Validate game configuration files for consistency
 */
async function validateGameData(vfs, gamePath) {
  const errors = []
  const warnings = []

  // Load all game data
  const gameData = await vfs.exportToJSON(gamePath)

  // Check quest references
  if (gameData.quests) {
    for (const [questName, quest] of Object.entries(gameData.quests)) {
      // Check NPC references
      if (quest._content?.questGiver) {
        const npcPath = `${gamePath}/npcs/${quest._content.questGiver}.json`
        const exists = await vfs.exists(npcPath)
        if (!exists) {
          errors.push(`Quest ${questName} references missing NPC: ${quest._content.questGiver}`)
        }
      }

      // Check item rewards
      if (quest._content?.rewards?.items) {
        for (const item of quest._content.rewards.items) {
          const itemPath = `${gamePath}/items/${item}.json`
          const exists = await vfs.exists(itemPath)
          if (!exists) {
            warnings.push(`Quest ${questName} rewards missing item: ${item}`)
          }
        }
      }
    }
  }

  // Check balance
  if (gameData.items) {
    const itemPowers = []
    for (const [itemName, item] of Object.entries(gameData.items)) {
      if (item._content?.stats) {
        const totalPower = Object.values(item._content.stats)
          .reduce((a, b) => a + b, 0)
        itemPowers.push({ name: itemName, power: totalPower })
      }
    }

    // Find outliers
    const avgPower = itemPowers.reduce((a, b) => a + b.power, 0) / itemPowers.length
    const outliers = itemPowers.filter(i => Math.abs(i.power - avgPower) > avgPower * 2)

    for (const outlier of outliers) {
      warnings.push(`Item ${outlier.name} may be imbalanced (power: ${outlier.power}, avg: ${avgPower})`)
    }
  }

  return { errors, warnings, valid: errors.length === 0 }
}
```

### Generate Loot Tables
```javascript
/**
 * Generate weighted loot tables from item definitions
 */
async function generateLootTables(vfs, itemsPath) {
  const items = await vfs.exportToJSON(itemsPath)
  const tables = {
    common: [],
    uncommon: [],
    rare: [],
    epic: [],
    legendary: []
  }

  for (const [itemName, item] of Object.entries(items)) {
    if (item._meta?.type === 'file' && item._content?.rarity) {
      const entry = {
        name: itemName.replace('.json', ''),
        weight: getWeight(item._content.rarity),
        data: item._content
      }

      tables[item._content.rarity.toLowerCase()].push(entry)
    }
  }

  // Normalize weights
  for (const table of Object.values(tables)) {
    const totalWeight = table.reduce((a, b) => a + b.weight, 0)
    for (const entry of table) {
      entry.probability = (entry.weight / totalWeight * 100).toFixed(2) + '%'
    }
  }

  return tables
}

function getWeight(rarity) {
  const weights = {
    common: 100,
    uncommon: 50,
    rare: 20,
    epic: 5,
    legendary: 1
  }
  return weights[rarity.toLowerCase()] || 10
}
```

## Using These Functions

All these functions are templates that you can customize for your specific needs. To use them:

1. Copy the function you need
2. Modify it for your specific requirements
3. Use it with your VFS instance:

```javascript
import { Brainy } from '@soulcraft/brainy'

// Initialize VFS
const brain = new Brainy()
await brain.init()
const vfs = brain.vfs()
await vfs.init()

// Use your custom function
const insights = await getProjectInsights(vfs, '/my-project')
console.log(insights.recommendations)

// Combine multiple functions
const deps = await getDependencyGraph(vfs, '/src')
const cycles = await findCircularDependencies(vfs, '/src')
const untested = await findUntestedCode(vfs, '/src', '/tests')
```

Remember: These are starting points. The power of VFS is that you can combine its primitives to build exactly what you need for your domain!