import config from '../config';
import path from 'path';

import gulp from 'gulp';
import cached from 'gulp-cached';
import eslint from 'gulp-eslint';
import gulpif from 'gulp-if';
import htmlhint from 'gulp-htmlhint';
import plumber from 'gulp-plumber';
import sassLint from 'gulp-sass-lint';

const target = config.currentTarget;
const isProduction = target === 'production';

/**
 * Linting of javascript and jsx files
 *
 * @param cb: callback handler passed by gulp, signals task completion when called
 */
const lintJs = (cb) => {

  gulp.src(
    path.join(
      config.paths.src,
      config.paths.js,
      '/**/*.{js, jsx}'
    ))
    .pipe(plumber())
    .pipe(cached('eslint'))
    .pipe(eslint(config.eslint[target]))
    .pipe(gulpif(!isProduction, eslint.format()))
    .pipe(gulpif(isProduction, eslint.formatEach('stylish', process.stdout)))
    .pipe(gulpif(isProduction, eslint.failOnError()))
    .on('data', gulpif(!isProduction, (file) => {
      if (file.eslint.messages && file.eslint.messages.length) gulp.fail = true;
    }));

  cb();
};

/**
 * Linting of sass / scss files
 *
 * @param cb: callback handler passed by gulp, signals task completion when called
 */
const lintSass = (cb) => {

  gulp.src(
    path.join(
      config.paths.src,
      config.paths.sass,
      '/**/*.scss'
    ))
    .pipe(plumber())
    .pipe(gulpif(!isProduction, cached('sasslint')))
    .pipe(sassLint())
    .pipe(sassLint.format())
    .pipe(gulpif(isProduction, sassLint.failOnError()));

  cb();
};

/**
 * Linting of index.html
 *
 * @param cb: callback handler passed by gulp, signals task completion when called
 */
const lintHtml = (cb) => {
  gulp.src(
    path.join(
      config.paths.src,
      config.paths.html,
      `${config.fileNames.html}.html`
    ))
    .pipe(htmlhint(config.htmlhintrc))
    .pipe(gulpif(!isProduction, htmlhint.reporter()))
    .pipe(gulpif(isProduction, htmlhint.failReporter()));

  cb();
};

const lint = (cb) => {
  gulp.parallel(
    lintSass,
    lintJs,
    lintHtml
  );

  cb();
};

export {
  lint,
  lintHtml,
  lintJs,
  lintSass
};