const crypto = require('crypto')
const chalk = require('chalk')
const pkg = require('../package.json')

function digest(str) {
  return crypto.createHash('md5').update(str).digest('hex')
}

module.exports = {
  getEnvs() {
    const envs = Object.keys(process.env).reduce((ret, key) => {
      const val = process.env[key]
      if (key.indexOf('APP_') >= 0) {
        // console.log(chalk.green(`${key}=${val}`));
        ret[key] = val
      }
      return ret
    }, {})
    return envs
  },

  getDefineConstants(consts) {
    consts = Object.keys(consts).reduce((val, k) => {
      val[`process.env.${k}`] = process.env.TARO_ENV == 'h5' ? `'${consts[k]}'` : consts[k]
      return val
    }, {})
    return consts
  },

  getCacheIdentifier(consts = {}) {
    const env = process.env.NODE_ENV || 'development'
    const envHash = digest(JSON.stringify(consts))

    return `cache-loader:${pkg.version} ${env} ${envHash}`
  }
}