"use strict";

const plumber = require("gulp-plumber");
const through = require("through2");
const chalk = require("chalk");
const newer = require("gulp-newer");
const babel = require("gulp-babel");
const watch = require("gulp-watch");
const gutil = require("gulp-util");
const gulp = require("gulp");
const path = require("path");

const scripts = "./packages/*/src/**/*.js";

let srcEx, libFragment;

if (path.win32 === path) {
  srcEx = /(packages\\[^\\]+)\\src\\/;
  libFragment = "$1\\lib\\";
} else {
  srcEx = new RegExp("(packages/[^/]+)/src/");
  libFragment = "$1/lib/";
}

const mapToDest = function (path) { return path.replace(srcEx, libFragment); };
const dest = "packages";

gulp.task("default", ["build"]);

gulp.task("build", function () {
  return gulp.src(scripts)
    .pipe(plumber({
      errorHandler: function (err) {
        gutil.log(err.stack);
      },
    }))
    .pipe(newer({ map: mapToDest }))
    .pipe(through.obj(function (file, enc, callback) {
      gutil.log("Compiling", "'" + chalk.cyan(file.path) + "'...");
      callback(null, file);
    }))
    .pipe(babel())
    .pipe(through.obj(function (file, enc, callback) {
      file._path = file.path;
      file.path = mapToDest(file.path);
      callback(null, file);
    }))
    .pipe(gulp.dest(dest));
});

// TODO: remove this section
// temporarily just copying the old code since watch isn't working
gulp.task("build-watch", function () {
  return gulp.src(scripts)
    .pipe(plumber({
      errorHandler: function (err) {
        gutil.log(err.stack);
      },
    }))
    .pipe(through.obj(function (file, enc, callback) {
      file._path = file.path;
      file.path = file.path.replace(srcEx, libFragment);
      callback(null, file);
    }))
    .pipe(newer(dest))
    .pipe(through.obj(function (file, enc, callback) {
      gutil.log("Compiling", "'" + chalk.cyan(file._path) + "'...");
      callback(null, file);
    }))
    .pipe(babel())
    .pipe(gulp.dest(dest));
});

gulp.task("watch", ["build-watch"], function () {
  watch(scripts, { debounceDelay: 200 }, function () {
    gulp.start("build-watch");
  });
});