const gulp = require("gulp");
const gulpEsbuild = require('gulp-esbuild');
const less = require("gulp-less");
const livereload = require("gulp-livereload");
const cleanCSS = require('gulp-clean-css');
const notify = require("gulp-notify");
const compilePeg = require("gulp-peg");
const plumber = require("gulp-plumber");
const replace = require('gulp-replace');
const sourcemaps = require('gulp-sourcemaps');
const through = require("through2");

const noop = () => through.obj();

var handleError = {errorHandler: notify.onError("Error: <%= error.message %>")};

function styles(files, dev) {
    return gulp.src(files)
        .pipe(dev ? plumber(handleError) : noop())
        .pipe(sourcemaps.init())
        .pipe(less())
        .pipe(dev ? noop() : cleanCSS())
        .pipe(sourcemaps.write(".", {sourceRoot: '/src/css'}))
        .pipe(gulp.dest("../mitmproxy/tools/web/static"))
        .pipe(livereload({auto: false}));
}

function styles_vendor_prod() {
    return styles("src/css/vendor.less", false)
}

function styles_vendor_dev() {
    return styles("src/css/vendor.less", true)
}

function styles_app_prod() {
    return styles("src/css/app.less", false)
}

function styles_app_dev() {
    return styles("src/css/app.less", true)
}


function esbuild(dev) {
    return gulp.src('src/js/app.jsx').pipe(
        gulpEsbuild({
            outfile: 'app.js',
            sourcemap: true,
            sourceRoot: "/",
            minify: !dev,
            keepNames: true,
            bundle: true,
        }))
        .pipe(gulp.dest("../mitmproxy/tools/web/static"))
        .pipe(livereload({auto: false}));
}

function scripts_dev() {
    return esbuild(true);
}

function scripts_prod() {
    return esbuild(false);
}

const copy_src = ["src/images/**", "src/fonts/fontawesome-webfont.*"];

function copy() {
    return gulp.src(copy_src, {base: "src/"})
        .pipe(gulp.dest("../mitmproxy/tools/web/static"));
}

const template_src = "src/templates/*";

function templates() {
    return gulp.src(template_src, {base: "src/"})
        .pipe(gulp.dest("../mitmproxy/tools/web"));
}

const peg_src = "src/js/filt/filt.peg";

function peg() {
    return gulp.src(peg_src, {base: "src/"})
        .pipe(plumber(handleError))
        .pipe(compilePeg())
        .pipe(replace('module.exports = ',
            'import * as flowutils from "../flow/utils"\n' +
            'export default '))
        .pipe(gulp.dest("src/"));
}

const dev = gulp.parallel(
    copy,
    styles_vendor_dev,
    styles_app_dev,
    peg,
    scripts_dev,
    templates
);

const prod = gulp.parallel(
    copy,
    styles_vendor_prod,
    styles_app_prod,
    peg,
    scripts_prod,
    templates
);

exports.dev = dev;
exports.prod = prod;
exports.default = function watch() {
    const opts = {ignoreInitial: false};
    livereload.listen({auto: true});
    gulp.watch(["src/css/vendor*"], opts, styles_vendor_dev);
    gulp.watch(["src/css/**"], opts, styles_app_dev);
    gulp.watch(["src/js/**"], opts, scripts_dev);
    gulp.watch(template_src, opts, templates);
    gulp.watch(peg_src, opts, peg);
    gulp.watch(copy_src, opts, copy);
}