const { task, src, dest, series, watch } = require("gulp");
// const axios = require("axios");
const browserify = require("browserify");
const babelify = require("babelify");
const concat = require("gulp-concat");
const del = require("del");
const source = require("vinyl-source-stream");
const buffer = require("vinyl-buffer");
const vinylPaths = require("vinyl-paths");
const eslint = require("gulp-eslint-new");
var sass = require("gulp-sass")(require("dart-sass"));
const replace = require("gulp-replace");
const uglify = require("gulp-uglify");
const through2 = require("through2");
// sass.compiler = require("dart-sass");

let eslintConfig = ".eslintrc.json";

task("clean", function () {
  return src("./dist/", { allowEmpty: true }).pipe(vinylPaths(del));
});

task("lint", function () {
  let filelist = [
    "./src/js/**/*.js",
    "!./src/js/global-dependencies.js",
    "!./src/js/exports.js",
  ];
  filelist.push("./static/**/*.json");
  return src(filelist)
    .pipe(eslint(eslintConfig))
    .pipe(eslint.format())
    .pipe(eslint.failAfterError());
});

//concatenates and lints legacy js files and writes the output to dist/gen/index.js
task("cat", function () {
  return src(["./src/js/global-dependencies.js", "./src/js/exports.js"])
    .pipe(concat("index.js"))
    .pipe(eslint(eslintConfig))
    .pipe(eslint.format())
    .pipe(eslint.failAfterError())
    .pipe(dest("./dist/gen"));
});

task("copy-modules", function () {
  return src(
    [
      "./src/js/**/*.js",
      "!./src/js/global-dependencies.js",
      "!./src/js/exports.js",
    ],
    { allowEmpty: true, base: "./src/js" }
  ).pipe(dest("./dist/gen"));
});

//bundles the refactored js files together with index.js (the concatenated legacy js files)
//it's odd that the entry point is generated, so we should seek a better way of doing this
task("browserify", function () {
  const b = browserify({
    //index.js is generated by task "cat"
    entries: "./dist/gen/index.js",
    //a source map isn't very useful right now because
    //the source files are concatenated together
    debug: false,
  });
  return b
    .transform(
      babelify.configure({
        presets: ["@babel/preset-env"],
        plugins: ["@babel/transform-runtime"],
      })
    )
    .bundle()
    .pipe(source("monkeytype.js"))
    .pipe(buffer())
    .pipe(
      uglify({
        mangle: false,
      })
    )
    .pipe(dest("./dist/js"));
});

task("static", function () {
  return src("./static/**/*", { dot: true }).pipe(dest("./dist/"));
});

task("sass", function () {
  return src("./src/sass/*.scss")
    .pipe(concat("style.scss"))
    .pipe(sass({ outputStyle: "compressed" }).on("error", sass.logError))
    .pipe(dest("dist/css"));
});

task("updateSwCacheName", function () {
  let date = new Date();
  let dateString =
    date.getFullYear() +
    "-" +
    (date.getMonth() + 1) +
    "-" +
    date.getDate() +
    "-" +
    date.getHours() +
    "-" +
    date.getMinutes() +
    "-" +
    date.getSeconds();
  return src(["static/sw.js"])
    .pipe(
      replace(
        /const staticCacheName = .*;/g,
        `const staticCacheName = "sw-cache-${dateString}";`
      )
    )
    .pipe(
      through2.obj(function (file, enc, cb) {
        var date = new Date();
        file.stat.atime = date;
        file.stat.mtime = date;
        cb(null, file);
      })
    )
    .pipe(dest("./dist/"));
});

task(
  "compile",
  series(
    "lint",
    "cat",
    "copy-modules",
    "browserify",
    "static",
    "sass",
    "updateSwCacheName"
  )
);

task("watch", function () {
  watch(["./static/**/*", "./src/**/*"], series("compile"));
});

task("build", series("clean", "compile"));