const gulp = require('gulp');
const del = require('del');
const gutil = require("gulp-util");
const webpack = require("webpack");
const server = require('gulp-develop-server');
const notifier = require('node-notifier');
const runSequence = require('run-sequence');
const lightReload = require('light-reload');
const useref = require('gulp-useref');
const gulpif = require('gulp-if');
const uglify = require('gulp-uglify');
const minifyCss = require('gulp-clean-css');

gulp.task('client:prd-build', (callback) => {
  let config = require('./config/webpack.prod.js');
  webpack(config, (err, stats) => {
    showWebpackError(err, stats);
    callback();
  });
});

gulp.task('client:dev-build', () => {
  let config = require('./config/webpack.dev.js');
  let compiler = webpack(config);
  compiler.watch(200, (err, stats) => {
    showWebpackError(err, stats);
    notifier.notify({
      title: 'Humpback-Client',
      message: 'Client build succeed.'
    });
    lightReload.reload();
  });
});

gulp.task('clean', () => {
  return del(['dist/*', '!dist/dbFiles', '!dist/node_modules'], { force: true });
});

gulp.task('server:clean', (callback) => {
  return del(['dist/**/*', '!dist/client'], { force: true });
});

gulp.task('server:copy', () => {
  return gulp.src(['src/server/**'])
    .pipe(gulp.dest('dist/'));
});

gulp.task('server:reload', (callback) => {
  runSequence('server:copy', 'server:restart', callback);
});

gulp.task('server:start', (callback) => {
  lightReload.init();
  server.listen({ path: 'dist/index.js' }, err => {
    if (err) console.log('listen', err);
  });
  callback();
});

gulp.task('server:restart', (callback) => {
  server.restart(err => {
    if (err) console.log('restart', err);
    notifier.notify({
      title: 'Humpback-Server',
      message: 'Server restarted.'
    });
  });
  callback();
});

gulp.task('server:watch', () => {
  return gulp.watch(['src/server/**/*.js'], ['server:reload']);
});

gulp.task('release:html', () => {
  return gulp.src('dist/client/index.html')
    .pipe(useref())
    .pipe(gulpif('*.js', uglify()))
    .pipe(gulpif('*.css', minifyCss()))
    .pipe(gulp.dest('dist/client'));
});

gulp.task('release:clean-unused-file', () => {
  let rootPath = 'dist/client/static';
  return del([
    `${rootPath}/**/*.css`,
    `${rootPath}/**/*.js`,
    `!${rootPath}/vendor/css/vendor.min.css`,
    `!${rootPath}/vendor/js/vendor.min.js`,
    `!${rootPath}/css/site.min.css`,
    `!${rootPath}/js/site.min.js`
  ], { force: true });
});

gulp.task('dev', (callback) => {
  runSequence(
    'clean',
    'server:copy',
    'server:start',
    'server:watch',
    'client:dev-build',
    callback);
});

gulp.task('release', (callback) => {
  runSequence(
    'clean',
    'server:copy',
    'client:prd-build',
    'release:html',
    'release:clean-unused-file',
    callback);
});

let showWebpackError = (err, stats) => {
  if (err) {
    throw new gutil.PluginError('webpack', err);
  }
  gutil.log("[webpack:build-dev]", stats.toString({
    colors: true,
    hash: false,
    timings: true,
    chunks: true,
    chunkModules: false,
    modules: false,
    children: false,
    version: true,
    cached: true,
    cachedAssets: true,
    reasons: false,
    source: false,
    errorDetails: false
  }));
};