#!/usr/bin/env bun

// WARNING: [[ No human has been anywhere near this file. It's pure Claude slop. 
//             Enter at your own risk. ]]

import { readFileSync } from 'fs'

type CallInfo = {
  method: string
  line: number
  calls: Set<string>
  isRecursive?: boolean
}

// Parse the parser file and extract method calls
function analyzeParser(filePath: string): Map<string, CallInfo> {
  const content = readFileSync(filePath, 'utf-8')
  const lines = content.split('\n')
  const methods = new Map<string, CallInfo>()

  // Find all method definitions
  const methodRegex = /^\s*(\w+)\s*\([^)]*\):\s*/

  let currentMethod: string | null = null
  let braceDepth = 0
  let classDepth = 0

  for (let i = 0; i < lines.length; i++) {
    const line = lines[i] || ''

    // Track if we're inside the Parser class
    if (line.includes('class Parser')) {
      classDepth = braceDepth + 1 // Will be the depth after we process this line's brace
    }

    // Check for method definition (only inside class, at class level)
    // Check BEFORE incrementing braceDepth
    if (classDepth > 0 && braceDepth === classDepth) {
      const methodMatch = line.match(methodRegex)
      if (methodMatch && !line.includes('class ')) {
        currentMethod = methodMatch[1]!
        methods.set(currentMethod, {
          method: currentMethod,
          line: i + 1,
          calls: new Set()
        })
      }
    }

    // Track brace depth
    braceDepth += (line.match(/{/g) || []).length
    braceDepth -= (line.match(/}/g) || []).length

    // Find method calls within current method
    if (currentMethod && braceDepth > 0) {
      // Match this.methodName() calls
      const callRegex = /this\.(\w+)\s*\(/g
      let match
      while ((match = callRegex.exec(line)) !== null) {
        const calledMethod = match[1]!
        const info = methods.get(currentMethod)!
        info.calls.add(calledMethod)

        // Mark recursive calls
        if (calledMethod === currentMethod) {
          info.isRecursive = true
        }
      }
    }

    // Reset when method ends
    if (braceDepth === 0) {
      currentMethod = null
    }
  }

  return methods
}

// Build tree structure starting from a root method
function buildTree(
  method: string,
  callGraph: Map<string, CallInfo>,
  visited: Set<string>,
  indent = '',
  isLast = true,
  depth = 0,
  maxDepth = 3
): string[] {
  const lines: string[] = []
  const info = callGraph.get(method)

  if (!info) return lines

  // Add current method
  const prefix = depth === 0 ? '' : (isLast ? '└─> ' : '├─> ')
  const suffix = info.isRecursive ? ' (recursive)' : ''
  const lineNum = `[line ${info.line}]`
  lines.push(`${indent}${prefix}${method}() ${lineNum}${suffix}`)

  // Stop if we've reached max depth
  if (depth >= maxDepth) {
    return lines
  }

  // Prevent infinite recursion in tree display
  if (visited.has(method)) {
    return lines
  }

  const newVisited = new Set(visited)
  newVisited.add(method)

  // Helper methods to filter out (low-level utilities)
  const helperPatterns = /^(is|next|peek|expect|current|op)/i

  // Get sorted unique calls (filter out recursive self-calls for display)
  const calls = Array.from(info.calls)
    .filter(c => callGraph.has(c)) // Only show parser methods
    .filter(c => c !== method) // Don't show immediate self-recursion
    .filter(c => !helperPatterns.test(c)) // Filter out helpers
    .sort()

  // Add children
  const newIndent = indent + (isLast ? '     ' : '│    ')
  calls.forEach((call, idx) => {
    const childLines = buildTree(
      call,
      callGraph,
      newVisited,
      newIndent,
      idx === calls.length - 1,
      depth + 1,
      maxDepth
    )
    lines.push(...childLines)
  })

  return lines
}

// Main
const parserPath = './src/parser/parser2.ts'
const maxDepth = parseInt(process.argv[2] || '5')

console.log('Parser Call Tree for', parserPath)
console.log(`Max depth: ${maxDepth}`)
console.log('═'.repeat(60))
console.log()

const callGraph = analyzeParser(parserPath)

// Start from parse() method
const tree = buildTree('parse', callGraph, new Set(), '', true, 0, maxDepth)
console.log(tree.join('\n'))

// Show some stats
console.log('\n' + '═'.repeat(60))
console.log('Stats:')
console.log(`  Total methods: ${callGraph.size}`)
console.log(`  Entry point: parse()`)

// Find methods that are never called (potential dead code or entry points)
const allCalled = new Set<string>()
for (const info of callGraph.values()) {
  info.calls.forEach(c => allCalled.add(c))
}

const uncalled = Array.from(callGraph.keys())
  .filter(m => !allCalled.has(m) && m !== 'parse')
  .sort()

if (uncalled.length > 0) {
  console.log(`\n  Uncalled methods: ${uncalled.join(', ')}`)
}

// Find most-called methods
const callCount = new Map<string, number>()
for (const info of callGraph.values()) {
  for (const called of info.calls) {
    callCount.set(called, (callCount.get(called) || 0) + 1)
  }
}

const topCalled = Array.from(callCount.entries())
  .sort((a, b) => b[1] - a[1])
  .slice(0, 5)

console.log(`\n  Most-called methods:`)
for (const [method, count] of topCalled) {
  console.log(`    ${method}() - called ${count} times`)
}