{
 "name": "myproject",
 "version": "1.0.0",
 "description": "my project",
 "author": "Kevin Zhang <zarknight@gmail.com>",
 "scripts": {
  "build:prod": "gulp build:prod",
  "build:clean": "gulp build:clean",
  "watch:clean": "gulp watch:clean",
  "start": "npm run watch:clean"
 },
 "devDependencies": {
  "autoprefixer": "^6.6.0",
  "babel-eslint": "^7.1.1",
  "babel-preset-latest": "^6.16.0",
  "del": "^2.2.2",
  "gulp": "^3.9.1",
  "gulp-babel": "^6.1.2",
  "gulp-cssnano": "^2.1.2",
  "gulp-eslint": "^3.0.1",
  "gulp-htmlmin": "^3.0.0",
  "gulp-if": "^2.0.2",
  "gulp-jsonlint": "^1.2.0",
  "gulp-jsonminify": "^1.0.0",
  "gulp-less": "^3.3.0",
  "gulp-load-plugins": "^1.4.0",
  "gulp-postcss": "^6.2.0",
  "gulp-rename": "^1.2.2",
  "gulp-sourcemaps": "^2.2.1",
  "gulp-uglify": "^2.0.0",
  "run-sequence": "^1.2.2"
 }
}

const gulp = require('gulp')
const del = require('del')
const runSequence = require('run-sequence')
const autoprefixer = require('autoprefixer')
const $ = require('gulp-load-plugins')()

let prod = false

// -------------------- Clean --------------------------

gulp.task('clean', () => {
 return del(['./dist/**'])
})

// -------------------- Lint ---------------------------

gulp.task('eslint', () => {
 return gulp.src(['./src/**/*.js'])
  .pipe($.eslint())
  .pipe($.eslint.format())
  .pipe($.eslint.failAfterError())
})

gulp.task('jsonlint', () => {
 return gulp.src(['./src/**/*.json'])
  .pipe($.jsonlint())
  .pipe($.jsonlint.reporter())
  .pipe($.jsonlint.failAfterError())
})

// -------------------- JSON ---------------------------

gulp.task('json', ['jsonlint'], () => {
 return gulp.src('./src/**/*.json')
  .pipe($.if(prod, $.jsonminify()))
  .pipe(gulp.dest('./dist'))
})

gulp.task('json:watch', () => {
 gulp.watch('./src/**/*.json', ['json'])
})

// -------------------- Assets --------------------------

gulp.task('assets', () => {
 return gulp.src('./src/assets/**')
  .pipe(gulp.dest('./dist/assets'))
})

gulp.task('assets:watch', () => {
 gulp.watch('./src/assets/**', ['assets'])
})

// -------------------- WXML -----------------------------

gulp.task('templates', () => {
 return gulp.src('./src/**/*.wxml')
  .pipe($.if(prod, $.htmlmin({
   collapseWhitespace: true,
   removeComments: true,
   keepClosingSlash: true
  })))
  .pipe(gulp.dest('./dist'))
})

gulp.task('templates:watch', () => {
 gulp.watch('./src/**/*.wxml', ['templates'])
})

// -------------------- WXSS ------------------------------

gulp.task('styles', () => {
 return gulp.src(['./src/**/*.wxss', '!./src/styles/**'])
  .pipe($.less())
  .pipe($.postcss([
   autoprefixer([
    'iOS >= 8',
    'Android >= 4.1'
   ])
  ]))
  .pipe($.if(prod, $.cssnano()))
  .pipe($.rename((path) => path.extname = '.wxss'))
  .pipe(gulp.dest('./dist'))
})

gulp.task('styles:watch', () => {
 gulp.watch('./src/**/*.wxss', ['styles'])
})

// -------------------- JS --------------------------------

gulp.task('scripts', ['eslint'], () => {
 return gulp.src('./src/**/*.js')
  .pipe($.babel())
  .pipe($.if(prod, $.uglify()))
  .pipe(gulp.dest('./dist'))
})

gulp.task('scripts:watch', () => {
 gulp.watch('./src/**/*.js', ['scripts'])
})

// ---------------------------------------------------------

gulp.task('build', [
 'json',
 'assets',
 'templates',
 'styles',
 'scripts'
])

gulp.task('watch', [
 'json:watch',
 'assets:watch',
 'templates:watch',
 'styles:watch',
 'scripts:watch'
])

gulp.task('build:clean', (callback) => {
 runSequence('clean', 'build', callback)
})

gulp.task('watch:clean', (callback) => {
 runSequence('build:clean', 'watch', callback)
})

gulp.task('build:prod', (callback) => {
 prod = true
 runSequence('build:clean', callback)
})

gulp.task('default', ['watch:clean'])