import {src} from 'gulp';
import {join} from 'path';
import {buildConfig} from '../build-config';

// These imports lack of type definitions.
const gulpSass = require('gulp-sass');
const nodeSass = require('node-sass');
const gulpIf = require('gulp-if');
const gulpCleanCss = require('gulp-clean-css');

const sassIncludePaths = [
  join(buildConfig.projectDir, 'node_modules/')
];

// Set the compiler to our version of `node-sass`, rather than the one that `gulp-sass` depends on.
gulpSass.compiler = nodeSass;

/** Create a gulp task that builds SCSS files. */
export function buildScssPipeline(sourceDir: string, minifyOutput = false) {
  return src(join(sourceDir, '**/!(test-).scss'))
    .pipe(gulpSass({includePaths: sassIncludePaths}).on('error', gulpSass.logError))
    .pipe(gulpIf(minifyOutput, gulpCleanCss()));
}