var fs = require('fs');
var path = require('path');
var merge = require('merge-stream');
var gulp = require('gulp');
var sourcemaps = require('gulp-sourcemaps');
var coffee = require('gulp-coffee');
var pug    = require('gulp-pug');
var insert = require('gulp-insert');
var uglify = require('gulp-uglify-es').default;
var concat = require('gulp-concat');

var paths = {
  lib:    'client/lib/*.js',
  coffee: 'client/scripts',
  pug:    'client/pug/*.pug',
  dest:   'static',
  maps:   'maps'
};

gulp.task('lib', function(){
  return gulp.src(paths.lib)
    .pipe(sourcemaps.init())
      .pipe(concat('lib.min.js'))
    .pipe(sourcemaps.write(paths.maps))
    .pipe(gulp.dest(paths.dest))
});

function getFolders(dir) {
  return fs.readdirSync(dir)
    .filter(function(file) {
      return fs.statSync(path.join(dir, file)).isDirectory();
    });
}

gulp.task('coffee', function(){
  var folders = getFolders(paths.coffee);

  var tasks = folders.map(function(folder) {
    return gulp.src(path.join(paths.coffee, folder, '/**/*.coffee'))
      .pipe(sourcemaps.init())
        .pipe(concat(folder + '.min.js'))
        .pipe(coffee({bare: true}))
        .pipe(insert.transform(function(contents, file) {
          return '$(function () {' + contents + '});';
        }))
        .pipe(uglify())
      .pipe(sourcemaps.write(paths.maps))
      .pipe(gulp.dest(paths.dest))
  });

  return merge(tasks);
});

gulp.task('pug', function(){
  return gulp.src(paths.pug)
    .pipe(pug())
    .pipe(gulp.dest(paths.dest))
});

gulp.task('default', [ 'lib', 'coffee', 'pug' ]);