// @flow
const fs = require('fs')
const path = require('path')
const { transform } = require('babel-core')

const walker = (inputPath, extension, list = []) => {
  if (fs.statSync(inputPath).isFile()) {
    list.push(inputPath)
    return
  }

  fs.readdirSync(inputPath).forEach(target => {
    const src = path.join(inputPath, target)
    const stat = fs.statSync(src)

    if (stat.isDirectory()) {
      walker(src, extension, list)
    } else {
      if (src.endsWith(extension)) {
        list.push(src)
      }
    }
  })
}

const getAllImports = filepath => {
  const imports = []
  const content = fs.readFileSync(filepath)

  transform(content, {
    plugins: [
      //'transform-runtime',
      //'transform-react-jsx',
      //'syntax-class-properties',
      'transform-decorators-legacy',
      {
        visitor: {
          ImportDeclaration(path) {
            imports.push(path.node.source.value)
          }
        }
      }
    ],
    presets: ['react', 'es2015', 'stage-0']
  })

  return imports
}

const argv = process.argv

if (argv.length !== 3) {
  console.log(`
Usage:

node dep.js <path>

for example:
node dep.js ./src/examples

shows every file dependency using import
`)

  process.exit(0)
}

const list = []
walker(argv[2], '.js', list)

list.forEach(path => {
  console.log(path)
  getAllImports(path).forEach(path => {
    console.log(`  ${path}`)
  })
})