// Requires
var gulp = require('gulp');
var del = require('del');
var runSequence = require('run-sequence');
var postcss = require('gulp-postcss');
var processors = [
  require('postcss-import'),
  require('postcss-mixins'),
  require('postcss-nested'),
  function(css) { /* Function to change some .pure classes to base elements */
    css.eachRule(function (rule){
        rule.selector = rule.selector.replace(/\.pure-table(\s+|-striped|$)/g,'table ');
        rule.selector = rule.selector.replace(/\.pure-img/,'img');
      });
  },
  require('cssnext')({
    browsers: ['last 1 version', '> 5%'],
    import: false,
    compress: true
  }),
  require('csswring')({
    removeAllComments: true
  })
];

var sourcemaps = require('gulp-sourcemaps');
var concat = require('gulp-concat');
var uglify = require('gulp-uglify');

// Configuration
var config = {
  'cssDir': 'css',
  'jsDir': 'js',
  'distDir': 'dist',
  'sourcemaps': true
};

gulp.task('dist', function(callback) {
  config.sourcemaps = false;
  return runSequence('clean',
    ['css', 'js'],
    callback);
});

gulp.task('default', function(callback) {

  return runSequence('clean',
    ['css', 'js'],
    callback);
});

gulp.task('clean', function() {
  del([config.distDir+'/**/*']);
});

gulp.task('css', function() {
  if(config.sourcemaps) {
    return gulp.src([config.cssDir+'/app.css'])
      .pipe(sourcemaps.init())
      .pipe(postcss(processors))
      .on('error', function (error) {
        console.log(error);
      })
      .pipe(sourcemaps.write('./'))
      .pipe(gulp.dest(config.distDir));
    } else {
      return gulp.src([config.cssDir+'/app.css'])
        .pipe(postcss(processors))
        .on('error', function (error) {
          console.log(error);
        })
        .pipe(gulp.dest(config.distDir));
    }
});

gulp.task('js', function() {
  if(config.sourcemaps) {
    return gulp.src([config.jsDir+'/*.js'])
      .pipe(concat('app.js'))
      .pipe(sourcemaps.init())
      .pipe(uglify({mangle: false}))
      .pipe(sourcemaps.write('./'))
      .pipe(gulp.dest(config.distDir));
  } else {
    return gulp.src([config.jsDir+'/*.js'])
      .pipe(concat('app.js'))
      .pipe(uglify({mangle: false}))
      .pipe(gulp.dest(config.distDir));
  }
});