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

const __filename = fileURLToPath(import.meta.url)
const __dirname = path.dirname(__filename)
const srcDir = path.resolve(__dirname, '../src')
const distDir = 'dist'
const pkgPath = path.resolve(__dirname, '../package.json')

function walk(dir) {
	let result = []
	const entries = fs.readdirSync(dir, { withFileTypes: true })

	for (const entry of entries) {
		const fullPath = path.join(dir, entry.name)
		if (entry.isDirectory() && !entry.name.endsWith('internal')) {
			result = result.concat(walk(fullPath))
		} else if (
			entry.isFile() &&
			entry.name.endsWith('.ts') &&
			!entry.name.endsWith('.d.ts') &&
			!entry.name.endsWith('.test.ts')
		) {
			result.push(fullPath)
		}
	}

	return result
}

function toSubpath(filePath) {
	const relativePath = path.relative(srcDir, filePath).replace(/\.ts$/, '')
	return relativePath.replace(/\\/g, '/') // For Windows compatibility
}

function updatePackageJson() {
	const packageJson = JSON.parse(fs.readFileSync(pkgPath, 'utf8'))
	const files = walk(srcDir)

	const exportsMap = {}

	files.forEach((file) => {
		const subpath = toSubpath(file)
		exportsMap[`./${subpath}`] = {
			import: `./${distDir}/${subpath}.js`,
			types: `./${distDir}/${subpath}.d.ts`
		}
	})

	packageJson.exports = exportsMap

	fs.writeFileSync(pkgPath, JSON.stringify(packageJson, null, 2))
	console.log('✅ Modern exports updated in package.json')
}

updatePackageJson()