'use strict';

var gulp = require('gulp');
var browserify = require('browserify');
var buffer = require('vinyl-buffer');
var rename = require('gulp-rename');
var source = require('vinyl-source-stream');
var eslint = require('gulp-eslint');
var qunit = require('gulp-qunit');
var mkdirp = require('mkdirp');
var del = require('del');
var runSequence = require('gulp4-run-sequence');

var outputPath = './dist';

gulp.task('build', function (done) {
  runSequence(
    'clean-dist',
    'create-dist',
    'lint',
    'compile',
    done);
});

gulp.task('clean-dist', function () { return del(outputPath); });

gulp.task('create-dist', function (done) { return mkdirp(outputPath, done); });

gulp.task('compile', function() {
  return browserify('./src/main.js')
    .bundle()
    .pipe(source('main.js'))
    .pipe(buffer())
    .pipe(rename('generated-image-editor.js'))
    .pipe(gulp.dest(outputPath));
});

gulp.task('test', gulp.series('compile', function() {
  return gulp.src('./test/index.html')
    .pipe(qunit({timeout: 1}));
}));

gulp.task('lint', function() {
  return gulp.src(['./src/**/*.js', './test/unit/*.js'])
    .pipe(eslint())
    .pipe(eslint.format())
    .pipe(eslint.failAfterError());
});

gulp.task('watch', function() {
  gulp.watch('./src/**/*.js', gulp.series('lint', 'compile'));
});

gulp.task('default', gulp.series('build'));