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+'use strict'
+// Copyright (c) 2018 inspiredware
+
+var path = require('path')
+var pkg = require(path.resolve('package.json'))
+
+var versionArray = process.version
+  .substr(1)
+  .replace(/-.*$/, '')
+  .split('.')
+  .map(function (item) {
+    return +item
+  })
+
+/**
+ *
+ * A set of utilities to assist developers of tools that build
+ * [N-API](https://nodejs.org/api/n-api.html#n_api_n_api) native add-ons.
+ *
+ * The main repository can be found
+ * [here](https://github.com/inspiredware/napi-build-utils#napi-build-utils).
+ *
+ * @module napi-build-utils
+ */
+
+/**
+ * Implements a consistent name of `napi` for N-API runtimes.
+ *
+ * @param {string} runtime The runtime string.
+ * @returns {boolean}
+ */
+exports.isNapiRuntime = function (runtime) {
+  return runtime === 'napi'
+}
+
+/**
+ * Determines whether the specified N-API version is supported
+ * by both the currently running Node instance and the package.
+ *
+ * @param {string} napiVersion The N-API version to check.
+ * @returns {boolean}
+ */
+exports.isSupportedVersion = function (napiVersion) {
+  var version = parseInt(napiVersion, 10)
+  return version <= exports.getNapiVersion() && exports.packageSupportsVersion(version)
+}
+
+/**
+ * Determines whether the specified N-API version is supported by the package.
+ * The N-API version must be present in the `package.json`
+ * `binary.napi_versions` array.
+ *
+ * @param {number} napiVersion The N-API version to check.
+ * @returns {boolean}
+ * @private
+ */
+exports.packageSupportsVersion = function (napiVersion) {
+  if (pkg.binary && pkg.binary.napi_versions &&
+      pkg.binary.napi_versions instanceof Array) { // integer array
+    for (var i = 0; i < pkg.binary.napi_versions.length; i++) {
+      if (pkg.binary.napi_versions[i] === napiVersion) return true
+    };
+  };
+  return false
+}
+
+/**
+ * Issues a warning to the supplied log if the N-API version is not supported
+ * by the current Node instance or if the N-API version is not supported
+ * by the package.
+ *
+ * @param {string} napiVersion The N-API version to check.
+ * @param {Object} log The log object to which the warnings are to be issued.
+ * Must implement the `warn` method.
+ */
+exports.logUnsupportedVersion = function (napiVersion, log) {
+  if (!exports.isSupportedVersion(napiVersion)) {
+    if (exports.packageSupportsVersion(napiVersion)) {
+      log.warn('This Node instance does not support N-API version ' + napiVersion)
+    } else {
+      log.warn('This package does not support N-API version ' + napiVersion)
+    }
+  }
+}
+
+/**
+ * Issues warnings to the supplied log for those N-API versions not supported
+ * by the N-API runtime or the package.
+ *
+ * Note that this function is specific to the
+ * [`prebuild`](https://github.com/prebuild/prebuild#prebuild) package.
+ *
+ * `target` is the list of targets to be built and is determined in one of
+ * three ways from the command line arguments:
+ * (1) `--target` specifies a specific target to build.
+ * (2) `--all` specifies all N-API versions supported by the package.
+ * (3) Neither of these specifies to build the single "best version available."
+ *
+ * `prebuild` is an array of objects in the form `{runtime: 'napi', target: '2'}`.
+ * The array contains the list of N-API versions that are supported by both the
+ * package being built and the currently running Node instance.
+ *
+ * The objective of this function is to issue a warning for those items that appear
+ * in the `target` argument but not in the `prebuild` argument.
+ * If a specific target is supported by the package (`packageSupportsVersion`) but
+ * but note in `prebuild`, the assumption is that the target is not supported by
+ * Node.
+ *
+ * @param {(Array<string>|string)} target The N-API version(s) to check. Target is
+ * @param {Array<Object>} prebuild A config object created by the `prebuild` package.
+ * @param {Object} log The log object to which the warnings are to be issued.
+ * Must implement the `warn` method.
+ * @private
+ */
+exports.logMissingNapiVersions = function (target, prebuild, log) {
+  if (exports.getNapiBuildVersions()) {
+    var targets = [].concat(target)
+    targets.forEach(function (napiVersion) {
+      if (!prebuildExists(prebuild, napiVersion)) {
+        if (exports.packageSupportsVersion(parseInt(napiVersion, 10))) {
+          log.warn('This Node instance does not support N-API version ' + napiVersion)
+        } else {
+          log.warn('This package does not support N-API version ' + napiVersion)
+        }
+      }
+    })
+  } else {
+    log.error('Builds with runtime \'napi\' require a binary.napi_versions ' +
+              'property on the package.json file')
+  }
+}
+
+/**
+ * Determines whether the specified N-API version exists in the prebuild
+ * configuration object.
+ *
+ * Note that this function is specific to the `prebuild` and `prebuild-install`
+ * packages.
+ *
+ * @param {Object} prebuild A config object created by the `prebuild` package.
+ * @param {string} napiVersion The N-APi version to be checked.
+ * @return {boolean}
+ * @private
+ */
+var prebuildExists = function (prebuild, napiVersion) {
+  if (prebuild) {
+    for (var i = 0; i < prebuild.length; i++) {
+      if (prebuild[i].target === napiVersion) return true
+    }
+  }
+  return false
+}
+
+/**
+ * Returns the best N-API version to build given the highest N-API
+ * version supported by the current Node instance and the N-API versions
+ * supported by the package, or undefined if a suitable N-API version
+ * cannot be determined.
+ *
+ * The best build version is the greatest N-API version supported by
+ * the package that is less than or equal to the highest N-API version
+ * supported by the current Node instance.
+ *
+ * @returns {number|undefined}
+ */
+exports.getBestNapiBuildVersion = function () {
+  var bestNapiBuildVersion = 0
+  var napiBuildVersions = exports.getNapiBuildVersions(pkg) // array of integer strings
+  if (napiBuildVersions) {
+    var ourNapiVersion = exports.getNapiVersion()
+    napiBuildVersions.forEach(function (napiBuildVersionStr) {
+      var napiBuildVersion = parseInt(napiBuildVersionStr, 10)
+      if (napiBuildVersion > bestNapiBuildVersion &&
+        napiBuildVersion <= ourNapiVersion) {
+        bestNapiBuildVersion = napiBuildVersion
+      }
+    })
+  }
+  return bestNapiBuildVersion === 0 ? undefined : bestNapiBuildVersion
+}
+
+/**
+ * Returns an array of N-API versions supported by the package.
+ *
+ * @returns {Array<string>|undefined}
+ */
+exports.getNapiBuildVersions = function () {
+  var napiBuildVersions = []
+  // remove duplicates, convert to text
+  if (pkg.binary && pkg.binary.napi_versions) {
+    pkg.binary.napi_versions.forEach(function (napiVersion) {
+      var duplicated = napiBuildVersions.indexOf('' + napiVersion) !== -1
+      if (!duplicated) {
+        napiBuildVersions.push('' + napiVersion)
+      }
+    })
+  }
+  return napiBuildVersions.length ? napiBuildVersions : undefined
+}
+
+/**
+ * Returns the highest N-API version supported by the current node instance
+ * or undefined if N-API is not supported.
+ *
+ * @returns {string|undefined}
+ */
+exports.getNapiVersion = function () {
+  var version = process.versions.napi // integer string, can be undefined
+  if (!version) { // this code should never need to be updated
+    if (versionArray[0] === 9 && versionArray[1] >= 3) version = '2' // 9.3.0+
+    else if (versionArray[0] === 8) version = '1' // 8.0.0+
+  }
+  return version
+}