/**
 * ------------------------------------------------------------------
 * gulpfile 文件
 * ------------------------------------------------------------------
 */

var path = require('path');
var gulp = require('gulp');
var sass = require('gulp-sass');
var rename = require('gulp-rename');
var imagemin = require('gulp-imagemin');
var sftp = require('gulp-sftp');
var del = require('del');
var replace = require('gulp-replace');
var postcss = require('gulp-postcss');
var qcloudUpload = require('gulp-qcloud-upload');
var gulpif = require('gulp-if');
var gutil = require('gulp-util');
var newer = require('gulp-newer');
var cache = require('gulp-cached');
var debug = require('gulp-debug');
var pxtorpx = require('postcss-px2rpx');
// var base64 = require('postcss-font-base64');
// var lazysprite = require('postcss-lazysprite');
var argv = require('yargs').argv;
var config = null;

// 获取用户配置
try {
	config = require('./config.custom.js');
} catch (e) {
	try {
		config = require('./config.js');
	} catch (e) {
		log(gutil.colors.red('丢失配置文件(config.js/config.custom.js)'));
	}
}

// 相关路径配置
var paths = {
	src: {
		baseDir: 'src',
		imgDir: 'src/image',
		spriteDir: 'src/assets/sprites',
		scssDir: 'src/assets/scss',
		imgFiles: 'src/image/**/*',
		scssFiles: 'src/**/*.scss',
		baseFiles: ['src/**/*.{png,js,json,wxml,wxss,wxs,ts,woff2}', '!src/assets/**/*', '!src/image/**/*'],
		assetsDir: 'src/assets',
		assetsImgFiles: 'src/assets/images/**/*.{png,jpg,jpeg,svg,gif}',
		wxmlFiles: ['src/**/*.wxml'],
		jsFiles: 'src/**/*.js'
	},
	dist: {
		baseDir: 'dist',
		imgDir: 'dist/image',
		wxssFiles: 'dist/**/*.wxss',
	},
	tmp: {
		baseDir: 'tmp',
		imgDir: 'tmp/assets/images',
		imgFiles: 'tmp/assets/images/**/*.{png,jpg,jpeg,svg,gif}'
	}
};

// 雪碧图的配置
var lazyspriteConfig = {
	imagePath: paths.src.spriteDir,
	stylesheetInput: paths.src.scssDir,
	stylesheetRelative: paths.src.assetsDir,
	spritePath: paths.src.assetsDir + '/images',
	smartUpdate: false,
	cssSeparator: '-',
	outputExtralCSS: true,
	nameSpace: 'icon-'
};

// Log for output msg.
function log() {
	var data = Array.prototype.slice.call(arguments);
	gutil.log.apply(false, data);
}

// 压缩图片
function imageMin() {
	// return gulp.src(paths.src.imgFiles, {si≤nce: gulp.lastRun(imageMin)})
	return gulp.src(paths.src.imgFiles)
		.pipe(newer(paths.dist.imgDir))
		.pipe(imagemin({
			progressive: true,
			svgoPlugins: [{
				removeViewBox: false
			}]
		}))
		.pipe(gulp.dest(paths.dist.imgDir));
}

// assets 文件夹下的图片处理
function assetsImgMin() {
	return gulp.src(paths.src.assetsImgFiles)
		.pipe(newer(paths.tmp.imgDir))
		.pipe(imagemin({
			progressive: true,
			svgoPlugins: [{
				removeViewBox: false
			}]
		}))
		.pipe(gulp.dest(paths.tmp.imgDir))
}

// Sass 编译
function sassCompile() {
	var res = config.assetsCDN + config.qcloud.prefix + '/';
	// 缩放比例 1为750
	var pxtorpxOpts = {
		times: 1
	};
	return gulp.src(paths.src.scssFiles)
		.pipe(sass({
				errLogToConsole: true,
				outputStyle: 'expanded'
			})
			.on('error', sass.logError))
		.pipe(gulpif(Boolean(argv.debug), debug({
			title: '`sassCompile` Debug:'
		})))
		// .pipe(postcss([lazysprite(lazyspriteConfig), pxtorpx(pxtorpxOpts), base64()]))
		.pipe(postcss([pxtorpx(pxtorpxOpts)]))
		.pipe(rename({
			'extname': '.wxss'
		}))
		.pipe(replace('.scss', '.wxss'))
		// .pipe(replace('%ASSETS_IMG%/', res))
		// .pipe(replace('src/assets/images', res)) // 雪碧图CSS RUL 中的图片路径
		.pipe(gulp.dest(paths.dist.baseDir))
}


// 复制基础文件
function copyBasicFiles() {
	return gulp.src(paths.src.baseFiles, {})
		.pipe(gulp.dest(paths.dist.baseDir));
}

// 复制 WXML
function copyWXML() {
	return gulp.src(paths.src.wxmlFiles, {})
		.pipe(gulp.dest(paths.dist.baseDir));
}


// 重写WXML 中 image 标签中的图片路径
function wxmlImgRewrite() {
	var res = config.assetsCDN + config.qcloud.prefix + '/';
	// console.log(res);
	return gulp.src(paths.src.wxmlFiles)
		// .pipe(replace('%ASSETS_IMG%/', res))
		.pipe(gulp.dest(paths.dist.baseDir))
}

// clean 任务, dist 目录
function cleanDist() {
	return del(paths.dist.baseDir);
}

// clean tmp 目录
function cleanTmp() {
	return del(paths.tmp.baseDir);
}

// 腾讯云上传任务
function qcloudCDN(cb) {
	if (config.enabledQcloud) {
		// return gulp.src(paths.src.assetsImgFiles, {since: gulp.lastRun(qcloudCDN)})
		return gulp.src(paths.tmp.imgFiles)
			.pipe(cache('qcloudCache'))
			.pipe(qcloudUpload({
				appid: config.qcloud.appid,
				secretId: config.qcloud.secretId,
				secretKey: config.qcloud.secretKey,
				bucket: config.qcloud.bucket,
				region: config.qcloud.region,
				prefix: config.qcloud.prefix,
				overWrite: config.qcloud.overWrite,
				headers: config.qcloud.headers
			}));
	}
	cb();
}


var watchHandler = function (type, file) {
	var extname = path.extname(file);
	// SCSS 文件
	if (extname === '.scss') {
		if (type === 'removed') {
			var tmp = file.replace('src/', 'dist/').replace(extname, '.wxss');
			del([tmp]);
		} else {
			sassCompile();
		}
	}
	// 图片文件
	else if (extname === '.png' || extname === '.jpg' || extname === '.jpeg' || extname === '.svg' || extname === '.gif') {
		if (type === 'removed') {
			if (file.indexOf('assets') > -1) {
				del([file.replace('src/', 'tmp/')]);
			} else {
				del([file.replace('src/', 'dist/')]);
			}
		} else {
			imageMin();
			// assetsImgMin();
			// qcloudCDN();
			wxmlImgRewrite();
		}
	}

	// wxml
	else if (extname === '.wxml') {
		if (type === 'removed') {
			var tmp = file.replace('src/', 'dist/')
			del([tmp]);
		} else {
			copyWXML();
			wxmlImgRewrite();
		}
	}

	// 其余文件
	else {
		if (type === 'removed') {
			var tmp = file.replace('src/', 'dist/');
			del([tmp]);
		} else {
			copyBasicFiles();
			// copyWXML();
			wxmlImgRewrite();
		}
	}
};

//监听文件
function watch(cb) {
	var watcher = gulp.watch([
		paths.src.baseDir,
		paths.tmp.imgDir
	], {
		ignored: /[\/\\]\./
	});
	watcher
		.on('change', function (file) {
			log(gutil.colors.yellow(file) + ' is changed');
			watchHandler('changed', file);
		})
		.on('add', function (file) {
			log(gutil.colors.yellow(file) + ' is added');
			watchHandler('add', file);
		})
		.on('unlink', function (file) {
			log(gutil.colors.yellow(file) + ' is deleted');
			watchHandler('removed', file);
		});

	cb();
}

//注册默认任务
gulp.task('default', gulp.series(
	cleanTmp,
	copyBasicFiles,
	gulp.parallel(
		sassCompile,
		imageMin,
		copyWXML
	),
	wxmlImgRewrite,
	// assetsImgMin,
	// qcloudCDN,
	watch
));

//注册测试任务
gulp.task('test', gulp.series(
	cleanTmp,
	copyBasicFiles,
	gulp.parallel(
		sassCompile,
		imageMin,
		copyWXML
	),
	wxmlImgRewrite,
	// assetsImgMin,
	// qcloudCDN
));

// 删除任务
gulp.task('clean', gulp.parallel(
	cleanTmp,
	cleanDist
));