"use strict";

var transform = require("../lib/6to5/transformation/transform");
var File      = require("../lib/6to5/file");
var util      = require("../lib/6to5/util");
var fs        = require("fs");
var t         = require("../lib/6to5/types");
var _         = require("lodash");

var relative = function (filename) {
  return __dirname + "/6to5-runtime/" + filename;
};

var writeFile = function (filename, content) {
  filename = relative(filename);
  console.log(filename);
  fs.writeFileSync(filename, content);
};

var readFile = function (filename) {
  return fs.readFileSync(require.resolve(filename), "utf8");
};

var updatePackage = function () {
  var pkgLoc = relative("package.json");
  var pkg    = require(pkgLoc);

  var mainPkg = require("../package.json");
  pkg.version = mainPkg.version;

  writeFile("package.json", JSON.stringify(pkg, null, 2));
};

var buildHelpers = function () {
  var body = [];
  var tree = t.program(body);

  _.each(File.helpers, function (name) {
    var key = t.identifier(t.toIdentifier(name));
    body.push(t.expressionStatement(
      t.assignmentExpression("=", t.memberExpression(t.identifier("exports"), key), util.template(name))
    ));
  });

  return transform.fromAst(tree, null, {
    optional: ["selfContained"]
  }).code;
};

writeFile("helpers.js", buildHelpers());
writeFile("core-js.js", readFile("core-js/library"));
writeFile("regenerator.js", readFile("core-js/library"));
updatePackage();