#!/usr/bin/env node
/**
 * prepare-src.mjs — Pre-build source transformation
 *
 * This script patches the source tree to make it compilable without Bun:
 * 1. Replace `import { feature } from 'bun:bundle'` with our stub
 * 2. Replace `MACRO.X` references with runtime values
 * 3. Create missing type declarations
 */

import fs from 'node:fs'
import path from 'node:path'
import { fileURLToPath } from 'node:url'

const __dirname = path.dirname(fileURLToPath(import.meta.url))
const ROOT = path.resolve(__dirname, '..')
const SRC = path.join(ROOT, 'src')

const VERSION = '2.1.88'

// ── Helpers ──────────────────────────────────────────────────────────────────

function walk(dir, ext = '.ts') {
 const results = []
 for (const entry of fs.readdirSync(dir, { withFileTypes: true })) {
 const full = path.join(dir, entry.name)
 if (entry.isDirectory() && entry.name !== 'node_modules') {
 results.push(...walk(full, ext))
 } else if (entry.name.endsWith(ext) || entry.name.endsWith('.tsx')) {
 results.push(full)
 }
 }
 return results
}

function patchFile(filePath) {
 let src = fs.readFileSync(filePath, 'utf8')
 let changed = false

 // 1. Replace `import { feature } from 'bun:bundle'` / `"bun:bundle"`
 if (src.includes("from 'bun:bundle'") || src.includes('from "bun:bundle"')) {
 src = src.replace(/import\s*\{\s*feature\s*\}\s*from\s*['"]bun:bundle['"]/g,
 "import { feature } from '../stubs/bun-bundle.js'")
 // Fix relative depth based on file location
 const rel = path.relative(SRC, path.dirname(filePath))
 const depth = rel ? '../'.repeat(rel.split('/').length) : ''
 if (depth) {
 src = src.replace("from '../stubs/bun-bundle.js'", `from '${depth}stubs/bun-bundle.js'`)
 }
 changed = true
 }

 // 2. Replace MACRO.X with string literals
 const macroReplacements = {
 'MACRO.VERSION': `'${VERSION}'`,
 'MACRO.BUILD_TIME': `'${new Date().toISOString()}'`,
 'MACRO.FEEDBACK_CHANNEL': `'https://github.com/anthropics/claude-code/issues'`,
 'MACRO.ISSUES_EXPLAINER': `'https://github.com/anthropics/claude-code/issues/new/choose'`,
 'MACRO.NATIVE_PACKAGE_URL': `'@anthropic-ai/claude-code'`,
 'MACRO.PACKAGE_URL': `'@anthropic-ai/claude-code'`,
 'MACRO.VERSION_CHANGELOG': `''`,
 }

 for (const [macro, replacement] of Object.entries(macroReplacements)) {
 if (src.includes(macro)) {
 // Don't replace inside strings
 src = src.replace(new RegExp(`(?<![\\w'"])${macro.replace('.', '\\.')}(?![\\w'" ])`, 'g'), replacement)
 changed = true
 }
 }

 if (changed) {
 fs.writeFileSync(filePath, src, 'utf8')
 return true
 }
 return false
}

// ── Main ─────────────────────────────────────────────────────────────────────

console.log('🔧 Preparing source files...\n')

const files = walk(SRC)
let patched = 0

for (const file of files) {
 if (patchFile(file)) {
 patched++
 console.log(` patched: ${path.relative(ROOT, file)}`)
 }
}

// Create stub for bun:ffi (only used in upstreamproxy)
const ffiStub = path.join(ROOT, 'stubs', 'bun-ffi.ts')
if (!fs.existsSync(ffiStub)) {
 fs.writeFileSync(ffiStub, `// Stub for bun:ffi — not available outside Bun runtime\nexport const ffi = {} as any\nexport function dlopen() { return {} }\n`)
 console.log(' created: stubs/bun-ffi.ts')
}

// Create global MACRO type declaration
const macroDecl = path.join(ROOT, 'stubs', 'global.d.ts')
fs.writeFileSync(macroDecl, `// Global compile-time macros (normally injected by Bun bundler)
declare const MACRO: {
 VERSION: string
 BUILD_TIME: string
 FEEDBACK_CHANNEL: string
 ISSUES_EXPLAINER: string
 NATIVE_PACKAGE_URL: string
 PACKAGE_URL: string
 VERSION_CHANGELOG: string
}
`)
console.log(' created: stubs/global.d.ts')

console.log(`\n✅ Patched ${patched} / ${files.length} source files`)