'use strict'

// gulp and utilities
import gulp from 'gulp'
import gutil from 'gulp-util'
import del from 'del'
import Sequence from 'run-sequence'
import watch from 'gulp-watch'
import lazypipe from 'lazypipe'

// script
import standard from 'gulp-standard'
import webpack from 'webpack'
import webpackConfig from './webpack.config.babel.js'

const sequence = Sequence.use(gulp)

let inProduction = process.env.NODE_ENV === 'production' || process.argv.indexOf('-p') !== -1

let watchOpts = {
  readDelay: 500,
  verbose: true
}

if (inProduction) {
  webpackConfig.plugins.push(new webpack.optimize.DedupePlugin())
  webpackConfig.plugins.push(new webpack.optimize.OccurenceOrderPlugin(false))
  webpackConfig.plugins.push(new webpack.optimize.UglifyJsPlugin({
    compress: {
      warnings: false,
      screw_ie8: true
    },
    comments: false,
    mangle: {
      screw_ie8: true
    },
    screw_ie8: true,
    sourceMap: false
  }))
}

let wpCompiler = webpack(Object.assign({}, webpackConfig, {
  cache: {},
  devtool: inProduction ? null : 'inline-source-map',
  debug: !inProduction
}))

function webpackTask (callback) {
  // run webpack
  wpCompiler.run(function (err, stats) {
    if (err) throw new gutil.PluginError('webpack', err)
    gutil.log('[webpack]', stats.toString({
      colors: true,
      hash: false,
      version: false,
      chunks: false,
      chunkModules: false
    }))
    callback()
  })
}

let lintPipe = lazypipe()
  .pipe(standard)
    .pipe(standard.reporter, 'default', {
      breakOnError: false
    })

// Cleanup task
gulp.task('clean', () => del('extension/fimfic2epub.js'))

// Main tasks
gulp.task('webpack', webpackTask)
gulp.task('script', ['webpack'])
gulp.task('watch:script', () => {
  return watch(['src/**/*.js'], watchOpts, function () {
    return sequence('script')
  })
})

gulp.task('lint', () => {
  return gulp.src(['gulpfile.babel.js', 'webpack.config.babel.js', 'src/**/*.js']).pipe(lintPipe())
})
gulp.task('watch:lint', () => {
  return watch(['src/**/*.js'], watchOpts, function (file) {
    gulp.src(file.path).pipe(lintPipe())
  })
})

// Default task
gulp.task('default', (done) => {
  sequence('clean', ['script', 'lint'], done)
})

// Watch task
gulp.task('watch', (done) => {
  sequence('default', ['watch:lint', 'watch:script'], done)
})