const parse = require('./parse')
const eq = require('./eq')

const diff = (version1, version2) => {
  if (eq(version1, version2)) {
    return null
  } else {
    const v1 = parse(version1)
    const v2 = parse(version2)
    let prefix = ''
    if (v1.prerelease.length || v2.prerelease.length) {
      prefix = 'pre'
      var defaultResult = 'prerelease'
    }
    for (const key in v1) {
      if (key === 'major' || key === 'minor' || key === 'patch') {
        if (v1[key] !== v2[key]) {
          return prefix + key
        }
      }
    }
    return defaultResult // may be undefined
  }
}
module.exports = diff
