var sass = require('gulp-sass');
var minifyCss = require('gulp-minify-css');
var autoprefixer = require('gulp-autoprefixer');
var sourcemaps = require('gulp-sourcemaps');
var gutil = require('gulp-util');
var gulpif = require('gulp-if');

module.exports = function (gulp, opts) {
    'use strict';

    return function () {
        gulp.task('sass', function () {
            gulp.src(opts.PROJECT_PATTERNS.sass)
                // sourcemaps can be activated through `gulp sass --debug´
                .pipe(gulpif(opts.DEBUG, sourcemaps.init()))
                .pipe(sass())
                .on('error', function (error) {
                    gutil.log(gutil.colors.red(
                        'Error (' + error.plugin + '): ' + error.messageFormatted)
                    );
                    // used on Aldryn to inform aldryn client about the errors in
                    // SASS compilation
                    if (process.env.EXIT_ON_ERRORS) {
                        process.exit(1);
                    }
                })
                .pipe(autoprefixer({
                    // browsers are coming from browserslist file
                    cascade: false
                }))
                .pipe(minifyCss({
                    rebase: false
                }))
                // sourcemaps can be activated through `gulp sass --debug´
                .pipe(gulpif(opts.DEBUG, sourcemaps.write()))
                .pipe(gulp.dest(opts.PROJECT_PATH.css));
        });
    };
};